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generated by cgit v1.2.1 (git 2.18.0) at 2025-02-11 22:20:22 +0000
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# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (C) 2019, Raspberry Pi Ltd
#
# ctt_ransac.py - camera tuning tool RANSAC selector for Macbeth chart locator

import numpy as np

scale = 2


"""
constructs normalised macbeth chart corners for ransac algorithm
"""
def get_square_verts(c_err=0.05, scale=scale):
    """
    define macbeth chart corners
    """
    b_bord_x, b_bord_y = scale*8.5, scale*13
    s_bord = 6*scale
    side = 41*scale
    x_max = side*6 + 5*s_bord + 2*b_bord_x
    y_max = side*4 + 3*s_bord + 2*b_bord_y
    c1 = (0, 0)
    c2 = (0, y_max)
    c3 = (x_max, y_max)
    c4 = (x_max, 0)
    mac_norm = np.array((c1, c2, c3, c4), np.float32)
    mac_norm = np.array([mac_norm])

    square_verts = []
    square_0 = np.array(((0, 0), (0, side),