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Initial implementation of the Raspberry Pi (BCM2835) Camera Tuning Tool. All code is licensed under the BSD-2-Clause terms. Copyright (c) 2019-2020 Raspberry Pi Trading Ltd. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (C) 2019, Raspberry Pi (Trading) Limited
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#
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# ctt_lux.py - camera tuning tool for lux level
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from ctt_tools import *
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"""
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Find lux values from metadata and calculate Y
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"""
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def lux(Cam,Img):
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shutter_speed = Img.exposure
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gain = Img.againQ8_norm
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aperture = 1
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Cam.log += '\nShutter speed = {}'.format(shutter_speed)
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Cam.log += '\nGain = {}'.format(gain)
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Cam.log += '\nAperture = {}'.format(aperture)
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patches = [Img.patches[i] for i in Img.order]
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channels = [Img.channels[i] for i in Img.order]
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return lux_calc(Cam,Img,patches,channels),shutter_speed,gain
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"""
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perform lux calibration on bayer channels
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"""
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def lux_calc(Cam,Img,patches,channels):
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"""
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find means color channels on grey patches
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"""
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ap_r = np.mean(patches[0][3::4])
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ap_g = (np.mean(patches[1][3::4])+np.mean(patches[2][3::4]))/2
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ap_b = np.mean(patches[3][3::4])
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Cam.log += '\nAverage channel values on grey patches:'
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Cam.log += '\nRed = {:.0f} Green = {:.0f} Blue = {:.0f}'.format(ap_r,ap_b,ap_g)
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# print(ap_r,ap_g,ap_b)
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"""
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calculate channel gains
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"""
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gr = ap_g/ap_r
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gb = ap_g/ap_b
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Cam.log += '\nChannel gains: Red = {:.3f} Blue = {:.3f}'.format(gr,gb)
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"""
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find means color channels on image and scale by gain
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note greens are averaged together (treated as one channel)
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"""
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a_r = np.mean(channels[0])*gr
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a_g = (np.mean(channels[1])+np.mean(channels[2]))/2
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a_b = np.mean(channels[3])*gb
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Cam.log += '\nAverage channel values over entire image scaled by channel gains:'
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Cam.log += '\nRed = {:.0f} Green = {:.0f} Blue = {:.0f}'.format(a_r,a_b,a_g)
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# print(a_r,a_g,a_b)
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"""
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Calculate y with top row of yuv matrix
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"""
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y = 0.299*a_r + 0.587*a_g + 0.114*a_b
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Cam.log += '\nY value calculated: {}'.format(int(y))
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# print(y)
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return int(y)
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