From 57b5210f37f4b6342abc9608740f946e6277eac1 Mon Sep 17 00:00:00 2001 From: Ben Benson Date: Fri, 25 Aug 2023 16:58:23 +0100 Subject: utils: raspberrypi: ctt: Added CAC support to the CTT Added the ability to tune the chromatic aberration correction within the ctt. There are options for cac_only or to tune as part of a larger tuning process. CTT will now recognise any files that begin with "cac" as being chromatic aberration tuning files. Signed-off-by: Ben Benson Reviewed-by: Naushir Patuck --- utils/raspberrypi/ctt/cac_only.py | 143 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) create mode 100644 utils/raspberrypi/ctt/cac_only.py (limited to 'utils/raspberrypi/ctt/cac_only.py') diff --git a/utils/raspberrypi/ctt/cac_only.py b/utils/raspberrypi/ctt/cac_only.py new file mode 100644 index 00000000..2bb11ccc --- /dev/null +++ b/utils/raspberrypi/ctt/cac_only.py @@ -0,0 +1,143 @@ +#!/usr/bin/env python3 +# +# SPDX-License-Identifier: BSD-2-Clause +# +# Copyright (C) 2023, Raspberry Pi (Trading) Limited +# +# cac_only.py - cac tuning tool + + +# This file allows you to tune only the chromatic aberration correction +# Specify any number of files in the command line args, and it shall iterate through +# and generate an averaged cac table from all the input images, which you can then +# input into your tuning file. + +# Takes .dng files produced by the camera modules of the dots grid and calculates the chromatic abberation of each dot. +# Then takes each dot, and works out where it was in the image, and uses that to output a tables of the shifts +# across the whole image. + +from PIL import Image +import numpy as np +import rawpy +import sys +import getopt + +from ctt_cac import * + + +def cac(filelist, output_filepath, plot_results=False): + np.set_printoptions(precision=3) + np.set_printoptions(suppress=True) + + # Create arrays to hold all the dots data and their colour offsets + red_shift = [] # Format is: [[Dot Center X, Dot Center Y, x shift, y shift]] + blue_shift = [] + # Iterate through the files + # Multiple files is reccomended to average out the lens aberration through rotations + for file in filelist: + print("\n Processing file " + str(file)) + # Read the raw RGB values from the .dng file + with rawpy.imread(file) as raw: + rgb = raw.postprocess() + sizes = (raw.sizes) + + image_size = [sizes[2], sizes[3]] # Image size, X, Y + # Create a colour copy of the RGB values to use later in the calibration + imout = Image.new(mode="RGB", size=image_size) + rgb_image = np.array(imout) + # The rgb values need reshaping from a 1d array to a 3d array to be worked with easily + rgb.reshape((image_size[0], image_size[1], 3)) + rgb_image = rgb + + # Pass the RGB image through to the dots locating program + # Returns an array of the dots (colour rectangles around the dots), and an array of their locations + print("Finding dots") + dots, dots_locations = find_dots_locations(rgb_image) + + # Now, analyse each dot. Work out the centroid of each colour channel, and use that to work out + # by how far the chromatic aberration has shifted each channel + print('Dots found: ' + str(len(dots))) + + for dot, dot_location in zip(dots, dots_locations): + if len(dot) > 0: + if (dot_location[0] > 0) and (dot_location[1] > 0): + ret = analyse_dot(dot, dot_location) + red_shift.append(ret[0]) + blue_shift.append(ret[1]) + + # Take our arrays of red shifts and locations, push them through to be interpolated into a 9x9 matrix + # for the CAC block to handle and then store these as a .json file to be added to the camera + # tuning file + print("\nCreating output grid") + rx, ry, bx, by = shifts_to_yaml(red_shift, blue_shift, image_size) + + print("CAC correction complete!") + + # The json format that we then paste into the tuning file (manually) + sample = ''' + { + "rpi.cac" : + { + "strength": 1.0, + "lut_rx" : [ + rx_vals + ], + "lut_ry" : [ + ry_vals + ], + "lut_bx" : [ + bx_vals + ], + "lut_by" : [ + by_vals + ] + } + } + ''' + + # Below, may look incorrect, however, the PiSP (standard) dimensions are flipped in comparison to + # PIL image coordinate directions, hence why xr -> yr. Also, the shifts calculated are colour shifts, + # and the PiSP block asks for the values it should shift (hence the * -1, to convert from colour shift to a pixel shift) + sample = sample.replace("rx_vals", pprint_array(ry * -1)) + sample = sample.replace("ry_vals", pprint_array(rx * -1)) + sample = sample.replace("bx_vals", pprint_array(by * -1)) + sample = sample.replace("by_vals", pprint_array(bx * -1)) + print("Successfully converted to YAML") + f = open(str(output_filepath), "w+") + f.write(sample) + f.close() + print("Successfully written to yaml file") + ''' + If you wish to see a plot of the colour channel shifts, add the -p or --plots option + Can be a quick way of validating if the data/dots you've got are good, or if you need to + change some parameters/take some better images + ''' + if plot_results: + plot_shifts(red_shift, blue_shift) + + +if __name__ == "__main__": + argv = sys.argv + # Detect the input and output file paths + arg_output = "output.json" + arg_help = "{0} -i -o -p ".format(argv[0]) + opts, args = getopt.getopt(argv[1:], "hi:o:p", ["help", "input=", "output=", "plot"]) + + output_location = 0 + input_location = 0 + filelist = [] + plot_results = False + for i in range(len(argv)): + if ("-h") in argv[i]: + print(arg_help) # print the help message + sys.exit(2) + if "-o" in argv[i]: + output_location = i + if ".dng" in argv[i]: + filelist.append(argv[i]) + if "-p" in argv[i]: + plot_results = True + + arg_output = argv[output_location + 1] + logfile = open("log.txt", "a+") + cac(filelist, arg_output, plot_results, logfile) -- cgit v1.2.1