utils: raspberrypi: ctt: Adapt tuning tool for both VC4 and PiSP

The old ctt.py and alsc_only.py scripts are removed.

Instead of ctt.py use ctt_vc4.py or ctt_pisp.py, depending on your
target platform.

Instead of alsc_only.py use alsc_vc4.py or alsc_pisp.py, again
according to your platform.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>

9 files changed, 511 insertions, 208 deletions

diff --git a/utils/raspberrypi/ctt/alsc_pisp.py b/utils/raspberrypi/ctt/alsc_pisp.py
new file mode 100755
index 00000000..499aecd1
--- /dev/null
+++ b/utils/raspberrypi/ctt/alsc_pisp.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (C) 2022, Raspberry Pi (Trading) Limited
+#
+# alsc_only.py - alsc tuning tool
+
+import sys
+
+from ctt_pisp import json_template, grid_size, target
+from ctt_run import run_ctt
+from ctt_tools import parse_input
+
+if __name__ == '__main__':
+    """
+    initialise calibration
+    """
+    if len(sys.argv) == 1:
+        print("""
+    PiSP Lens Shading Camera Tuning Tool version 1.0
+
+    Required Arguments:
+    '-i' : Calibration image directory.
+    '-o' : Name of output json file.
+
+    Optional Arguments:
+    '-c' : Config file for the CTT. If not passed, default parameters used.
+    '-l' : Name of output log file. If not passed, 'ctt_log.txt' used.
+              """)
+        quit(0)
+    else:
+        """
+        parse input arguments
+        """
+        json_output, directory, config, log_output = parse_input()
+        run_ctt(json_output, directory, config, log_output, json_template, grid_size, target, alsc_only=True)
diff --git a/utils/raspberrypi/ctt/alsc_only.py b/utils/raspberrypi/ctt/alsc_vc4.py
index 7cd0ac01..41ec382b 100755
--- a/utils/raspberrypi/ctt/alsc_only.py
+++ b/utils/raspberrypi/ctt/alsc_vc4.py
@@ -6,8 +6,11 @@
 #
 # alsc_only.py - alsc tuning tool
 
-from ctt import *
+import sys
 
+from ctt_vc4 import json_template, grid_size, target
+from ctt_run import run_ctt
+from ctt_tools import parse_input
 
 if __name__ == '__main__':
     """
@@ -15,7 +18,7 @@ if __name__ == '__main__':
     """
     if len(sys.argv) == 1:
         print("""
-    Pisp Camera Tuning Tool version 1.0
+    VC4 Lens Shading Camera Tuning Tool version 1.0
 
     Required Arguments:
     '-i' : Calibration image directory.
@@ -31,4 +34,4 @@ if __name__ == '__main__':
         parse input arguments
         """
         json_output, directory, config, log_output = parse_input()
-        run_ctt(json_output, directory, config, log_output, alsc_only=True)
+        run_ctt(json_output, directory, config, log_output, json_template, grid_size, target, alsc_only=True)
diff --git a/utils/raspberrypi/ctt/ctt_alsc.py b/utils/raspberrypi/ctt/ctt_alsc.py
index e51d6931..45a35f2b 100644
--- a/utils/raspberrypi/ctt/ctt_alsc.py
+++ b/utils/raspberrypi/ctt/ctt_alsc.py
@@ -13,8 +13,9 @@ from mpl_toolkits.mplot3d import Axes3D
 """
 preform alsc calibration on a set of images
 """
-def alsc_all(Cam, do_alsc_colour, plot):
+def alsc_all(Cam, do_alsc_colour, plot, grid_size=(16, 12)):
     imgs_alsc = Cam.imgs_alsc
+    grid_w, grid_h = grid_size
     """
     create list of colour temperatures and associated calibration tables
     """
@@ -23,7 +24,7 @@ def alsc_all(Cam, do_alsc_colour, plot):
     list_cb = []
     list_cg = []
     for Img in imgs_alsc:
-        col, cr, cb, cg, size = alsc(Cam, Img, do_alsc_colour, plot)
+        col, cr, cb, cg, size = alsc(Cam, Img, do_alsc_colour, plot, grid_size=grid_size)
         list_col.append(col)
         list_cr.append(cr)
         list_cb.append(cb)
@@ -68,11 +69,12 @@ def alsc_all(Cam, do_alsc_colour, plot):
             t_b = np.where((100*t_b) % 1 >= 0.95, t_b-0.001, t_b)
             t_r = np.round(t_r, 3)
             t_b = np.round(t_b, 3)
-            r_corners = (t_r[0], t_r[15], t_r[-1], t_r[-16])
-            b_corners = (t_b[0], t_b[15], t_b[-1], t_b[-16])
-            r_cen = t_r[5*16+7]+t_r[5*16+8]+t_r[6*16+7]+t_r[6*16+8]
+            r_corners = (t_r[0], t_r[grid_w - 1], t_r[-1], t_r[-grid_w])
+            b_corners = (t_b[0], t_b[grid_w - 1], t_b[-1], t_b[-grid_w])
+            middle_pos = (grid_h // 2 - 1) * grid_w + grid_w - 1
+            r_cen = t_r[middle_pos]+t_r[middle_pos + 1]+t_r[middle_pos + grid_w]+t_r[middle_pos + grid_w + 1]
             r_cen = round(r_cen/4, 3)
-            b_cen = t_b[5*16+7]+t_b[5*16+8]+t_b[6*16+7]+t_b[6*16+8]
+            b_cen = t_b[middle_pos]+t_b[middle_pos + 1]+t_b[middle_pos + grid_w]+t_b[middle_pos + grid_w + 1]
             b_cen = round(b_cen/4, 3)
             Cam.log += '\nRed table corners: {}'.format(r_corners)
             Cam.log += '\nRed table centre: {}'.format(r_cen)
@@ -116,8 +118,9 @@ def alsc_all(Cam, do_alsc_colour, plot):
 """
 calculate g/r and g/b for 32x32 points arranged in a grid for a single image
 """
-def alsc(Cam, Img, do_alsc_colour, plot=False):
+def alsc(Cam, Img, do_alsc_colour, plot=False, grid_size=(16, 12)):
     Cam.log += '\nProcessing image: ' + Img.name
+    grid_w, grid_h = grid_size
     """
     get channel in correct order
     """
@@ -128,24 +131,24 @@ def alsc(Cam, Img, do_alsc_colour, plot=False):
     where w is a multiple of 32.
     """
     w, h = Img.w/2, Img.h/2
-    dx, dy = int(-(-(w-1)//16)), int(-(-(h-1)//12))
+    dx, dy = int(-(-(w-1)//grid_w)), int(-(-(h-1)//grid_h))
     """
     average the green channels into one
     """
     av_ch_g = np.mean((channels[1:3]), axis=0)
     if do_alsc_colour:
         """
-        obtain 16x12 grid of intensities for each channel and subtract black level
+        obtain grid_w x grid_h grid of intensities for each channel and subtract black level
         """
-        g = get_16x12_grid(av_ch_g, dx, dy) - Img.blacklevel_16
-        r = get_16x12_grid(channels[0], dx, dy) - Img.blacklevel_16
-        b = get_16x12_grid(channels[3], dx, dy) - Img.blacklevel_16
+        g = get_grid(av_ch_g, dx, dy, grid_size) - Img.blacklevel_16
+        r = get_grid(channels[0], dx, dy, grid_size) - Img.blacklevel_16
+        b = get_grid(channels[3], dx, dy, grid_size) - Img.blacklevel_16
         """
         calculate ratios as 32 bit in order to be supported by medianBlur function
         """
-        cr = np.reshape(g/r, (12, 16)).astype('float32')
-        cb = np.reshape(g/b, (12, 16)).astype('float32')
-        cg = np.reshape(1/g, (12, 16)).astype('float32')
+        cr = np.reshape(g/r, (grid_h, grid_w)).astype('float32')
+        cb = np.reshape(g/b, (grid_h, grid_w)).astype('float32')
+        cg = np.reshape(1/g, (grid_h, grid_w)).astype('float32')
         """
         median blur to remove peaks and save as float 64
         """
@@ -164,7 +167,7 @@ def alsc(Cam, Img, do_alsc_colour, plot=False):
             """
             note Y is plotted as -Y so plot has same axes as image
             """
-            X, Y = np.meshgrid(range(16), range(12))
+            X, Y = np.meshgrid(range(grid_w), range(grid_h))
             ha.plot_surface(X, -Y, cr, cmap=cm.coolwarm, linewidth=0)
             ha.set_title('ALSC Plot\nImg: {}\n\ncr'.format(Img.str))
             hb = hf.add_subplot(312, projection='3d')
@@ -182,15 +185,15 @@ def alsc(Cam, Img, do_alsc_colour, plot=False):
         """
         only perform calculations for luminance shading
         """
-        g = get_16x12_grid(av_ch_g, dx, dy) - Img.blacklevel_16
-        cg = np.reshape(1/g, (12, 16)).astype('float32')
+        g = get_grid(av_ch_g, dx, dy, grid_size) - Img.blacklevel_16
+        cg = np.reshape(1/g, (grid_h, grid_w)).astype('float32')
         cg = cv2.medianBlur(cg, 3).astype('float64')
         cg = cg/np.min(cg)
 
         if plot:
             hf = plt.figure(figssize=(8, 8))
             ha = hf.add_subplot(1, 1, 1, projection='3d')
-            X, Y = np.meashgrid(range(16), range(12))
+            X, Y = np.meashgrid(range(grid_w), range(grid_h))
             ha.plot_surface(X, -Y, cg, cmap=cm.coolwarm, linewidth=0)
             ha.set_title('ALSC Plot (Luminance only!)\nImg: {}\n\ncg').format(Img.str)
             plt.show()
@@ -199,21 +202,22 @@ def alsc(Cam, Img, do_alsc_colour, plot=False):
 
 
 """
-Compresses channel down to a 16x12 grid
+Compresses channel down to a grid of the requested size
 """
-def get_16x12_grid(chan, dx, dy):
+def get_grid(chan, dx, dy, grid_size):
+    grid_w, grid_h = grid_size
     grid = []
     """
     since left and bottom border will not necessarily have rectangles of
     dimension dx x dy, the 32nd iteration has to be handled separately.
     """
-    for i in range(11):
-        for j in range(15):
+    for i in range(grid_h - 1):
+        for j in range(grid_w - 1):
             grid.append(np.mean(chan[dy*i:dy*(1+i), dx*j:dx*(1+j)]))
-        grid.append(np.mean(chan[dy*i:dy*(1+i), 15*dx:]))
-    for j in range(15):
-        grid.append(np.mean(chan[11*dy:, dx*j:dx*(1+j)]))
-    grid.append(np.mean(chan[11*dy:, 15*dx:]))
+        grid.append(np.mean(chan[dy*i:dy*(1+i), (grid_w - 1)*dx:]))
+    for j in range(grid_w - 1):
+        grid.append(np.mean(chan[(grid_h - 1)*dy:, dx*j:dx*(1+j)]))
+    grid.append(np.mean(chan[(grid_h - 1)*dy:, (grid_w - 1)*dx:]))
     """
     return as np.array, ready for further manipulation
     """
@@ -223,7 +227,7 @@ def get_16x12_grid(chan, dx, dy):
 """
 obtains sigmas for red and blue, effectively a measure of the 'error'
 """
-def get_sigma(Cam, cal_cr_list, cal_cb_list):
+def get_sigma(Cam, cal_cr_list, cal_cb_list, grid_size):
     Cam.log += '\nCalculating sigmas'
     """
     provided colour alsc tables were generated for two different colour
@@ -241,8 +245,8 @@ def get_sigma(Cam, cal_cr_list, cal_cb_list):
     sigma_rs = []
     sigma_bs = []
     for i in range(len(cts)-1):
-        sigma_rs.append(calc_sigma(cal_cr_list[i]['table'], cal_cr_list[i+1]['table']))
-        sigma_bs.append(calc_sigma(cal_cb_list[i]['table'], cal_cb_list[i+1]['table']))
+        sigma_rs.append(calc_sigma(cal_cr_list[i]['table'], cal_cr_list[i+1]['table'], grid_size))
+        sigma_bs.append(calc_sigma(cal_cb_list[i]['table'], cal_cb_list[i+1]['table'], grid_size))
         Cam.log += '\nColour temperature interval {} - {} K'.format(cts[i], cts[i+1])
         Cam.log += '\nSigma red: {}'.format(sigma_rs[-1])
         Cam.log += '\nSigma blue: {}'.format(sigma_bs[-1])
@@ -263,12 +267,13 @@ def get_sigma(Cam, cal_cr_list, cal_cb_list):
 """
 calculate sigma from two adjacent gain tables
 """
-def calc_sigma(g1, g2):
+def calc_sigma(g1, g2, grid_size):
+    grid_w, grid_h = grid_size
     """
     reshape into 16x12 matrix
     """
-    g1 = np.reshape(g1, (12, 16))
-    g2 = np.reshape(g2, (12, 16))
+    g1 = np.reshape(g1, (grid_h, grid_w))
+    g2 = np.reshape(g2, (grid_h, grid_w))
     """
     apply gains to gain table
     """
@@ -280,8 +285,8 @@ def calc_sigma(g1, g2):
     neighbours, then append to list
     """
     diffs = []
-    for i in range(10):
-        for j in range(14):
+    for i in range(grid_h - 2):
+        for j in range(grid_w - 2):
             """
             note indexing is incremented by 1 since all patches on borders are
             not counted
diff --git a/utils/raspberrypi/ctt/ctt_awb.py b/utils/raspberrypi/ctt/ctt_awb.py
index bf45e54d..5cc0fae6 100644
--- a/utils/raspberrypi/ctt/ctt_awb.py
+++ b/utils/raspberrypi/ctt/ctt_awb.py
@@ -13,7 +13,7 @@ from scipy.optimize import fmin
 """
 obtain piecewise linear approximation for colour curve
 """
-def awb(Cam, cal_cr_list, cal_cb_list, plot):
+def awb(Cam, cal_cr_list, cal_cb_list, plot, grid_size):
     imgs = Cam.imgs
     """
     condense alsc calibration tables into one dictionary
@@ -43,7 +43,7 @@ def awb(Cam, cal_cr_list, cal_cb_list, plot):
         Note: if alsc is disabled then colour_cals will be set to None and the
         function will just return the greyscale patches
         """
-        r_patchs, b_patchs, g_patchs = get_alsc_patches(Img, colour_cals)
+        r_patchs, b_patchs, g_patchs = get_alsc_patches(Img, colour_cals, grid_size=grid_size)
         """
         calculate ratio of r, b to g
         """
@@ -293,12 +293,13 @@ def awb(Cam, cal_cr_list, cal_cb_list, plot):
 """
 obtain greyscale patches and perform alsc colour correction
 """
-def get_alsc_patches(Img, colour_cals, grey=True):
+def get_alsc_patches(Img, colour_cals, grey=True, grid_size=(16, 12)):
     """
     get patch centre coordinates, image colour and the actual
     patches for each channel, remembering to subtract blacklevel
     If grey then only greyscale patches considered
     """
+    grid_w, grid_h = grid_size
     if grey:
         cen_coords = Img.cen_coords[3::4]
         col = Img.col
@@ -345,12 +346,12 @@ def get_alsc_patches(Img, colour_cals, grey=True):
         bef_tabs = np.array(colour_cals[bef])
         aft_tabs = np.array(colour_cals[aft])
         col_tabs = (bef_tabs*db + aft_tabs*da)/(da+db)
-    col_tabs = np.reshape(col_tabs, (2, 12, 16))
+    col_tabs = np.reshape(col_tabs, (2, grid_h, grid_w))
     """
     calculate dx, dy used to calculate alsc table
     """
     w, h = Img.w/2, Img.h/2
-    dx, dy = int(-(-(w-1)//16)), int(-(-(h-1)//12))
+    dx, dy = int(-(-(w-1)//grid_w)), int(-(-(h-1)//grid_h))
     """
     make list of pairs of gains for each patch by selecting the correct value
     in alsc colour calibration table
diff --git a/utils/raspberrypi/ctt/ctt_ccm.py b/utils/raspberrypi/ctt/ctt_ccm.py
index a09bfd09..8f3bc264 100644
--- a/utils/raspberrypi/ctt/ctt_ccm.py
+++ b/utils/raspberrypi/ctt/ctt_ccm.py
@@ -56,7 +56,7 @@ FInds colour correction matrices for list of images
 """
 
 
-def ccm(Cam, cal_cr_list, cal_cb_list):
+def ccm(Cam, cal_cr_list, cal_cb_list, grid_size):
     global matrix_selection_types, typenum
     imgs = Cam.imgs
     """
@@ -133,9 +133,7 @@ def ccm(Cam, cal_cr_list, cal_cb_list):
         Note: if alsc is disabled then colour_cals will be set to None and no
         the function will simply return the macbeth patches
         """
-        r, b, g = get_alsc_patches(Img, colour_cals, grey=False)
-        # 256 values for each patch of sRGB values
-
+        r, b, g = get_alsc_patches(Img, colour_cals, grey=False, grid_size=grid_size)
         """
         do awb
         Note: awb is done by measuring the macbeth chart in the image, rather
diff --git a/utils/raspberrypi/ctt/ctt_pisp.py b/utils/raspberrypi/ctt/ctt_pisp.py
new file mode 100755
index 00000000..f837e062
--- /dev/null
+++ b/utils/raspberrypi/ctt/ctt_pisp.py
@@ -0,0 +1,233 @@
+#!/usr/bin/env python3
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (C) 2019, Raspberry Pi Ltd
+#
+# ctt_pisp.py - camera tuning tool for PiSP platforms
+
+import os
+import sys
+
+from ctt_run import run_ctt
+from ctt_tools import parse_input
+
+json_template = {
+    "rpi.black_level": {
+        "black_level": 4096
+    },
+    "rpi.lux": {
+        "reference_shutter_speed": 10000,
+        "reference_gain": 1,
+        "reference_aperture": 1.0
+    },
+    "rpi.dpc": {
+	"strength": 1
+    },
+    "rpi.noise": {
+    },
+    "rpi.geq": {
+    },
+    "rpi.denoise":
+    {
+        "sdn":
+        {
+            "deviation": 1.6,
+            "strength": 0.5,
+            "deviation2": 3.2,
+            "deviation_no_tdn": 3.2,
+            "strength_no_tdn": 0.75
+        },
+        "cdn":
+        {
+            "deviation": 200,
+            "strength": 0.3
+        },
+        "tdn":
+        {
+            "deviation": 0.8,
+            "threshold": 0.05
+        }
+    },
+    "rpi.awb": {
+        "priors": [
+            {"lux": 0, "prior": [2000, 1.0, 3000, 0.0, 13000, 0.0]},
+            {"lux": 800, "prior": [2000, 0.0, 6000, 2.0, 13000, 2.0]},
+            {"lux": 1500, "prior": [2000, 0.0, 4000, 1.0, 6000, 6.0, 6500, 7.0, 7000, 1.0, 13000, 1.0]}
+        ],
+        "modes": {
+            "auto": {"lo": 2500, "hi": 7700},
+            "incandescent": {"lo": 2500, "hi": 3000},
+            "tungsten": {"lo": 3000, "hi": 3500},
+            "fluorescent": {"lo": 4000, "hi": 4700},
+            "indoor": {"lo": 3000, "hi": 5000},
+            "daylight": {"lo": 5500, "hi": 6500},
+            "cloudy": {"lo": 7000, "hi": 8000}
+        },
+        "bayes": 1
+    },
+    "rpi.agc": {
+        "metering_modes": {
+            "centre-weighted": {
+		"weights": [
+		    0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
+		    0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 0,
+		    1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1,
+		    1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1,
+		    1, 1, 2, 2, 2, 2, 3, 3, 3, 2, 2, 2, 2, 1, 1,
+		    1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1,
+		    1, 1, 2, 2, 3, 3, 3, 4, 3, 3, 3, 2, 2, 1, 1,
+		    1, 1, 2, 2, 3, 3, 4, 4, 4, 3, 3, 2, 2, 1, 1,
+		    1, 1, 2, 2, 3, 3, 3, 4, 3, 3, 3, 2, 2, 1, 1,
+		    1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1,
+		    1, 1, 2, 2, 2, 2, 3, 3, 3, 2, 2, 2, 2, 1, 1,
+		    1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1,
+		    1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1,
+		    0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 0,
+		    0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0
+		]
+            },
+            "spot": {
+		"weights": [
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 1, 2, 3, 2, 1, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+		]
+            },
+            "matrix": {
+                "weights": [
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
+		]
+            }
+        },
+        "exposure_modes": {
+            "normal": {
+                "shutter": [100, 10000, 30000, 60000, 66666],
+                "gain": [1.0, 1.5, 2.0, 4.0, 8.0]
+            },
+            "short": {
+                "shutter": [100, 5000, 10000, 20000, 60000],
+                "gain": [1.0, 1.5, 2.0, 4.0, 8.0]
+            },
+            "long":
+            {
+                "shutter": [ 100, 10000, 30000, 60000, 90000, 120000 ],
+                "gain": [ 1.0, 1.5, 2.0, 4.0, 8.0, 12.0 ]
+            }
+        },
+        "constraint_modes": {
+            "normal": [
+                {"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.5, 1000, 0.5]}
+            ],
+            "highlight": [
+                {"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.5, 1000, 0.5]},
+                {"bound": "UPPER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.8, 1000, 0.8]}
+            ]
+        },
+        "y_target": [0, 0.16, 1000, 0.165, 10000, 0.17]
+    },
+    "rpi.alsc": {
+        'omega': 1.3,
+        'n_iter': 100,
+        'luminance_strength': 0.8,
+    },
+    "rpi.contrast": {
+        "ce_enable": 1,
+        "gamma_curve": [
+            0,     0,
+            1024,  5040,
+            2048,  9338,
+            3072,  12356,
+            4096,  15312,
+            5120,  18051,
+            6144,  20790,
+            7168,  23193,
+            8192,  25744,
+            9216,  27942,
+            10240, 30035,
+            11264, 32005,
+            12288, 33975,
+            13312, 35815,
+            14336, 37600,
+            15360, 39168,
+            16384, 40642,
+            18432, 43379,
+            20480, 45749,
+            22528, 47753,
+            24576, 49621,
+            26624, 51253,
+            28672, 52698,
+            30720, 53796,
+            32768, 54876,
+            36864, 57012,
+            40960, 58656,
+            45056, 59954,
+            49152, 61183,
+            53248, 62355,
+            57344, 63419,
+            61440, 64476,
+            65535, 65535
+        ]
+    },
+    "rpi.ccm": {
+    },
+    "rpi.sharpen": {
+	"threshold": 0.25,
+	"limit": 1.0,
+	"strength": 1.0
+    }
+}
+
+grid_size = (32, 32)
+
+target = 'pisp'
+
+if __name__ == '__main__':
+    """
+    initialise calibration
+    """
+    if len(sys.argv) == 1:
+        print("""
+    PiSP Camera Tuning Tool version 1.0
+
+    Required Arguments:
+    '-i' : Calibration image directory.
+    '-o' : Name of output json file.
+
+    Optional Arguments:
+    '-c' : Config file for the CTT. If not passed, default parameters used.
+    '-l' : Name of output log file. If not passed, 'ctt_log.txt' used.
+              """)
+        quit(0)
+    else:
+        """
+        parse input arguments
+        """
+        json_output, directory, config, log_output = parse_input()
+        run_ctt(json_output, directory, config, log_output, json_template, grid_size, target)
diff --git a/utils/raspberrypi/ctt/ctt_pretty_print_json.py b/utils/raspberrypi/ctt/ctt_pretty_print_json.py
index 3e3b8475..5d16b2a6 100755
--- a/utils/raspberrypi/ctt/ctt_pretty_print_json.py
+++ b/utils/raspberrypi/ctt/ctt_pretty_print_json.py
@@ -19,6 +19,7 @@ class Encoder(json.JSONEncoder):
         self.indentation_level = 0
         self.hard_break = 120
         self.custom_elems = {
+            'weights': 15,
             'table': 16,
             'luminance_lut': 16,
             'ct_curve': 3,
@@ -87,7 +88,7 @@ class Encoder(json.JSONEncoder):
         return self.encode(o)
 
 
-def pretty_print(in_json: dict) -> str:
+def pretty_print(in_json: dict, custom_elems={}) -> str:
 
     if 'version' not in in_json or \
        'target' not in in_json or \
@@ -95,7 +96,9 @@ def pretty_print(in_json: dict) -> str:
        in_json['version'] < 2.0:
         raise RuntimeError('Incompatible JSON dictionary has been provided')
 
-    return json.dumps(in_json, cls=Encoder, indent=4, sort_keys=False)
+    encoder = Encoder(indent=4, sort_keys=False)
+    encoder.custom_elems |= custom_elems
+    return encoder.encode(in_json) #json.dumps(in_json, cls=Encoder, indent=4, sort_keys=False)
 
 
 if __name__ == "__main__":
diff --git a/utils/raspberrypi/ctt/ctt.py b/utils/raspberrypi/ctt/ctt_run.py
index cd89f177..ebd1a1c5 100755
--- a/utils/raspberrypi/ctt/ctt.py
+++ b/utils/raspberrypi/ctt/ctt_run.py
@@ -67,7 +67,7 @@ Camera object that is the backbone of the tuning tool.
 Input is the desired path of the output json.
 """
 class Camera:
-    def __init__(self, jfile):
+    def __init__(self, jfile, json):
         self.path = os.path.dirname(os.path.expanduser(__file__)) + '/'
         if self.path == '/':
             self.path = ''
@@ -79,127 +79,15 @@ class Camera:
         """
         initial json dict populated by uncalibrated values
         """
-        self.json = {
-            "rpi.black_level": {
-                "black_level": 4096
-            },
-            "rpi.dpc": {
-            },
-            "rpi.lux": {
-                "reference_shutter_speed": 10000,
-                "reference_gain": 1,
-                "reference_aperture": 1.0
-            },
-            "rpi.noise": {
-            },
-            "rpi.geq": {
-            },
-            "rpi.sdn": {
-            },
-            "rpi.awb": {
-                "priors": [
-                    {"lux": 0, "prior": [2000, 1.0, 3000, 0.0, 13000, 0.0]},
-                    {"lux": 800, "prior": [2000, 0.0, 6000, 2.0, 13000, 2.0]},
-                    {"lux": 1500, "prior": [2000, 0.0, 4000, 1.0, 6000, 6.0, 6500, 7.0, 7000, 1.0, 13000, 1.0]}
-                ],
-                "modes": {
-                    "auto": {"lo": 2500, "hi": 8000},
-                    "incandescent": {"lo": 2500, "hi": 3000},
-                    "tungsten": {"lo": 3000, "hi": 3500},
-                    "fluorescent": {"lo": 4000, "hi": 4700},
-                    "indoor": {"lo": 3000, "hi": 5000},
-                    "daylight": {"lo": 5500, "hi": 6500},
-                    "cloudy": {"lo": 7000, "hi": 8600}
-                },
-                "bayes": 1
-            },
-            "rpi.agc": {
-                "metering_modes": {
-                    "centre-weighted": {
-                        "weights": [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0]
-                    },
-                    "spot": {
-                        "weights": [2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
-                    },
-                    "matrix": {
-                        "weights": [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
-                    }
-                },
-                "exposure_modes": {
-                    "normal": {
-                        "shutter": [100, 10000, 30000, 60000, 120000],
-                        "gain": [1.0, 2.0, 4.0, 6.0, 6.0]
-                    },
-                    "short": {
-                        "shutter": [100, 5000, 10000, 20000, 120000],
-                        "gain": [1.0, 2.0, 4.0, 6.0, 6.0]
-                    }
-                },
-                "constraint_modes": {
-                    "normal": [
-                        {"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.5, 1000, 0.5]}
-                    ],
-                    "highlight": [
-                        {"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.5, 1000, 0.5]},
-                        {"bound": "UPPER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.8, 1000, 0.8]}
-                    ]
-                },
-                "y_target": [0, 0.16, 1000, 0.165, 10000, 0.17]
-            },
-            "rpi.alsc": {
-                'omega': 1.3,
-                'n_iter': 100,
-                'luminance_strength': 0.7,
-            },
-            "rpi.contrast": {
-                "ce_enable": 1,
-                "gamma_curve": [
-                    0,     0,
-                    1024,  5040,
-                    2048,  9338,
-                    3072,  12356,
-                    4096,  15312,
-                    5120,  18051,
-                    6144,  20790,
-                    7168,  23193,
-                    8192,  25744,
-                    9216,  27942,
-                    10240, 30035,
-                    11264, 32005,
-                    12288, 33975,
-                    13312, 35815,
-                    14336, 37600,
-                    15360, 39168,
-                    16384, 40642,
-                    18432, 43379,
-                    20480, 45749,
-                    22528, 47753,
-                    24576, 49621,
-                    26624, 51253,
-                    28672, 52698,
-                    30720, 53796,
-                    32768, 54876,
-                    36864, 57012,
-                    40960, 58656,
-                    45056, 59954,
-                    49152, 61183,
-                    53248, 62355,
-                    57344, 63419,
-                    61440, 64476,
-                    65535, 65535
-                ]
-            },
-            "rpi.ccm": {
-            },
-            "rpi.sharpen": {
-            }
-        }
+
+        self.json = json
+
 
     """
     Perform colour correction calibrations by comparing macbeth patch colours
     to standard macbeth chart colours.
     """
-    def ccm_cal(self, do_alsc_colour):
+    def ccm_cal(self, do_alsc_colour, grid_size):
         if 'rpi.ccm' in self.disable:
             return 1
         print('\nStarting CCM calibration')
@@ -245,7 +133,7 @@ class Camera:
         Do CCM calibration
         """
         try:
-            ccms = ccm(self, cal_cr_list, cal_cb_list)
+            ccms = ccm(self, cal_cr_list, cal_cb_list, grid_size)
         except ArithmeticError:
             print('ERROR: Matrix is singular!\nTake new pictures and try again...')
             self.log += '\nERROR: Singular matrix encountered during fit!'
@@ -263,7 +151,7 @@ class Camera:
     various colour temperatures, as well as providing a maximum 'wiggle room'
     distance from this curve (transverse_neg/pos).
     """
-    def awb_cal(self, greyworld, do_alsc_colour):
+    def awb_cal(self, greyworld, do_alsc_colour, grid_size):
         if 'rpi.awb' in self.disable:
             return 1
         print('\nStarting AWB calibration')
@@ -306,7 +194,7 @@ class Camera:
         call calibration function
         """
         plot = "rpi.awb" in self.plot
-        awb_out = awb(self, cal_cr_list, cal_cb_list, plot)
+        awb_out = awb(self, cal_cr_list, cal_cb_list, plot, grid_size)
         ct_curve, transverse_neg, transverse_pos = awb_out
         """
         write output to json
@@ -324,7 +212,7 @@ class Camera:
     colour channel seperately, and then partially corrects for vignetting.
     The extent of the correction depends on the 'luminance_strength' parameter.
     """
-    def alsc_cal(self, luminance_strength, do_alsc_colour):
+    def alsc_cal(self, luminance_strength, do_alsc_colour, grid_size):
         if 'rpi.alsc' in self.disable:
             return 1
         print('\nStarting ALSC calibration')
@@ -347,7 +235,7 @@ class Camera:
         call calibration function
         """
         plot = "rpi.alsc" in self.plot
-        alsc_out = alsc_all(self, do_alsc_colour, plot)
+        alsc_out = alsc_all(self, do_alsc_colour, plot, grid_size)
         cal_cr_list, cal_cb_list, luminance_lut, av_corn = alsc_out
         """
         write ouput to json and finish if not do_alsc_colour
@@ -393,7 +281,7 @@ class Camera:
         """
         obtain worst-case scenario residual sigmas
         """
-        sigma_r, sigma_b = get_sigma(self, cal_cr_list, cal_cb_list)
+        sigma_r, sigma_b = get_sigma(self, cal_cr_list, cal_cb_list, grid_size)
         """
         write output to json
         """
@@ -509,19 +397,20 @@ class Camera:
     """
     writes the json dictionary to the raw json file then make pretty
     """
-    def write_json(self):
+    def write_json(self, version=2.0, target='bcm2835', grid_size=(16, 12)):
         """
         Write json dictionary to file using our version 2 format
         """
 
         out_json = {
-            "version": 2.0,
-            'target': 'bcm2835',
+            "version": version,
+            'target': target,
             "algorithms": [{name: data} for name, data in self.json.items()],
         }
 
         with open(self.jf, 'w') as f:
-            f.write(pretty_print(out_json))
+            f.write(pretty_print(out_json,
+                                 custom_elems={'table': grid_size[0], 'luminance_lut': grid_size[0]}))
 
     """
     add a new section to the log file
@@ -712,7 +601,7 @@ class Camera:
             return 0
 
 
-def run_ctt(json_output, directory, config, log_output, alsc_only=False):
+def run_ctt(json_output, directory, config, log_output, json_template, grid_size, target, alsc_only=False):
     """
     check input files are jsons
     """
@@ -748,7 +637,7 @@ def run_ctt(json_output, directory, config, log_output, alsc_only=False):
     greyworld = get_config(awb_d, "greyworld", 0, 'bool')
     alsc_d = get_config(configs, "alsc", {}, 'dict')
     do_alsc_colour = get_config(alsc_d, "do_alsc_colour", 1, 'bool')
-    luminance_strength = get_config(alsc_d, "luminance_strength", 0.5, 'num')
+    luminance_strength = get_config(alsc_d, "luminance_strength", 0.8, 'num')
     blacklevel = get_config(configs, "blacklevel", -1, 'num')
     macbeth_d = get_config(configs, "macbeth", {}, 'dict')
     mac_small = get_config(macbeth_d, "small", 0, 'bool')
@@ -772,7 +661,7 @@ def run_ctt(json_output, directory, config, log_output, alsc_only=False):
     initialise tuning tool and load images
     """
     try:
-        Cam = Camera(json_output)
+        Cam = Camera(json_output, json=json_template)
         Cam.log_user_input(json_output, directory, config, log_output)
         if alsc_only:
             disable = set(Cam.json.keys()).symmetric_difference({"rpi.alsc"})
@@ -794,14 +683,16 @@ def run_ctt(json_output, directory, config, log_output, alsc_only=False):
             Cam.json['rpi.black_level']['black_level'] = Cam.blacklevel_16
         Cam.json_remove(disable)
         print('\nSTARTING CALIBRATIONS')
-        Cam.alsc_cal(luminance_strength, do_alsc_colour)
+        Cam.alsc_cal(luminance_strength, do_alsc_colour, grid_size)
         Cam.geq_cal()
         Cam.lux_cal()
         Cam.noise_cal()
-        Cam.awb_cal(greyworld, do_alsc_colour)
-        Cam.ccm_cal(do_alsc_colour)
+        Cam.cac_cal(do_alsc_colour)
+        Cam.awb_cal(greyworld, do_alsc_colour, grid_size)
+        Cam.ccm_cal(do_alsc_colour, grid_size)
+
         print('\nFINISHED CALIBRATIONS')
-        Cam.write_json()
+        Cam.write_json(target=target, grid_size=grid_size)
         Cam.write_log(log_output)
         print('\nCalibrations written to: '+json_output)
         if log_output is None:
@@ -810,28 +701,3 @@ def run_ctt(json_output, directory, config, log_output, alsc_only=False):
         pass
     else:
         Cam.write_log(log_output)
-
-
-if __name__ == '__main__':
-    """
-    initialise calibration
-    """
-    if len(sys.argv) == 1:
-        print("""
-    Pisp Camera Tuning Tool version 1.0
-
-    Required Arguments:
-    '-i' : Calibration image directory.
-    '-o' : Name of output json file.
-
-    Optional Arguments:
-    '-c' : Config file for the CTT. If not passed, default parameters used.
-    '-l' : Name of output log file. If not passed, 'ctt_log.txt' used.
-              """)
-        quit(0)
-    else:
-        """
-        parse input arguments
-        """
-        json_output, directory, config, log_output = parse_input()
-        run_ctt(json_output, directory, config, log_output)
diff --git a/utils/raspberrypi/ctt/ctt_vc4.py b/utils/raspberrypi/ctt/ctt_vc4.py
new file mode 100755
index 00000000..86acfd47
--- /dev/null
+++ b/utils/raspberrypi/ctt/ctt_vc4.py
@@ -0,0 +1,157 @@
+#!/usr/bin/env python3
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (C) 2019, Raspberry Pi Ltd
+#
+# ctt_vc4.py - camera tuning tool for VC4 platforms
+
+import os
+import sys
+
+from ctt_run import run_ctt
+from ctt_tools import parse_input
+
+json_template = {
+    "rpi.black_level": {
+        "black_level": 4096
+    },
+    "rpi.dpc": {
+    },
+    "rpi.lux": {
+        "reference_shutter_speed": 10000,
+        "reference_gain": 1,
+        "reference_aperture": 1.0
+    },
+    "rpi.noise": {
+    },
+    "rpi.geq": {
+    },
+    "rpi.sdn": {
+    },
+    "rpi.awb": {
+        "priors": [
+            {"lux": 0, "prior": [2000, 1.0, 3000, 0.0, 13000, 0.0]},
+            {"lux": 800, "prior": [2000, 0.0, 6000, 2.0, 13000, 2.0]},
+            {"lux": 1500, "prior": [2000, 0.0, 4000, 1.0, 6000, 6.0, 6500, 7.0, 7000, 1.0, 13000, 1.0]}
+        ],
+        "modes": {
+            "auto": {"lo": 2500, "hi": 8000},
+            "incandescent": {"lo": 2500, "hi": 3000},
+            "tungsten": {"lo": 3000, "hi": 3500},
+            "fluorescent": {"lo": 4000, "hi": 4700},
+            "indoor": {"lo": 3000, "hi": 5000},
+            "daylight": {"lo": 5500, "hi": 6500},
+            "cloudy": {"lo": 7000, "hi": 8600}
+        },
+        "bayes": 1
+    },
+    "rpi.agc": {
+        "metering_modes": {
+            "centre-weighted": {
+                "weights": [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0]
+            },
+            "spot": {
+                "weights": [2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+            },
+            "matrix": {
+                "weights": [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
+            }
+        },
+        "exposure_modes": {
+            "normal": {
+                "shutter": [100, 10000, 30000, 60000, 120000],
+                "gain": [1.0, 2.0, 4.0, 6.0, 6.0]
+            },
+            "short": {
+                "shutter": [100, 5000, 10000, 20000, 120000],
+                "gain": [1.0, 2.0, 4.0, 6.0, 6.0]
+            }
+        },
+        "constraint_modes": {
+            "normal": [
+                {"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.5, 1000, 0.5]}
+            ],
+            "highlight": [
+                {"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.5, 1000, 0.5]},
+                {"bound": "UPPER", "q_lo": 0.98, "q_hi": 1.0, "y_target": [0, 0.8, 1000, 0.8]}
+            ]
+        },
+        "y_target": [0, 0.16, 1000, 0.165, 10000, 0.17]
+    },
+    "rpi.alsc": {
+        'omega': 1.3,
+        'n_iter': 100,
+        'luminance_strength': 0.7,
+    },
+    "rpi.contrast": {
+        "ce_enable": 1,
+        "gamma_curve": [
+            0,     0,
+            1024,  5040,
+            2048,  9338,
+            3072,  12356,
+            4096,  15312,
+            5120,  18051,
+            6144,  20790,
+            7168,  23193,
+            8192,  25744,
+            9216,  27942,
+            10240, 30035,
+            11264, 32005,
+            12288, 33975,
+            13312, 35815,
+            14336, 37600,
+            15360, 39168,
+            16384, 40642,
+            18432, 43379,
+            20480, 45749,
+            22528, 47753,
+            24576, 49621,
+            26624, 51253,
+            28672, 52698,
+            30720, 53796,
+            32768, 54876,
+            36864, 57012,
+            40960, 58656,
+            45056, 59954,
+            49152, 61183,
+            53248, 62355,
+            57344, 63419,
+            61440, 64476,
+            65535, 65535
+        ]
+    },
+    "rpi.ccm": {
+    },
+    "rpi.sharpen": {
+    }
+}
+
+grid_size = (16, 12)
+
+target = 'bcm2835'
+
+if __name__ == '__main__':
+    """
+    initialise calibration
+    """
+    if len(sys.argv) == 1:
+        print("""
+    VC4 Camera Tuning Tool version 1.0
+
+    Required Arguments:
+    '-i' : Calibration image directory.
+    '-o' : Name of output json file.
+
+    Optional Arguments:
+    '-c' : Config file for the CTT. If not passed, default parameters used.
+    '-l' : Name of output log file. If not passed, 'ctt_log.txt' used.
+              """)
+        quit(0)
+    else:
+        """
+        parse input arguments
+        """
+        json_output, directory, config, log_output = parse_input()
+        run_ctt(json_output, directory, config, log_output, json_template, grid_size, target)