big camera: Add interactive test of optics

debian/control

@@ -52,6 +52,8 @@ Depends:
  python3-pytest,
  python3-evdev,
  python3-nmea2,
+ python3-numpy,
+ python3-opencv,
  python3-pyudev,
  python3-yaml,
  usb-modeswitch,

test_scripts/camera_optics.py

+"""
+Interactively tests camera optics under controlled brightness.
+
+Does not test focus.
+"""
+import cv2
+import numpy as np
+import shlex
+import subprocess
+from tempfile import NamedTemporaryFile
+import time
+
+
+def call(cmd):
+    return subprocess.check_call(shlex.split(cmd))
+
+
+def yad(argstr):
+    return call('yad ' + argstr)
+
+
+def use_big_camera():
+    # set up media pipeline
+    call('''media-ctl -d "platform:30b80000.csi" --entity "csi" --set-v4l2 "'csi':0 [fmt:SGRBG8/1052x780 colorspace:raw]"''')
+    call('''media-ctl -d "platform:30b80000.csi" --entity "csi" --set-v4l2 "'imx8mq-mipi-csi2 30b60000.csi':0 [fmt:SGRBG8/1052x780 colorspace:raw]"''')
+    call('''media-ctl -d "platform:30b80000.csi" --entity "csi" --set-v4l2 "'s5k3l6xx 3-002d':0 [fmt:SGRBG8/1052x780 colorspace:raw]"''')
+    call('''media-ctl -d "platform:30b80000.csi" -l "'s5k3l6xx 3-002d':0 -> 'imx8mq-mipi-csi2 30b60000.csi':0 [1]"''')
+
+    # no test pttern
+    call('''v4l2-ctl --media-bus-info platform:30b80000.csi --device 's5k3l6xx 3-002d' --set-ctrl=test_pattern=0''')
+
+    # Gain should match test conditions (test rig?)
+    call('''v4l2-ctl --media-bus-info platform:30b80000.csi --device 's5k3l6xx 3-002d' --set-ctrl=analogue_gain=512 --set-ctrl=exposure=3000''')
+
+    # return raw picture
+    with NamedTemporaryFile(mode='rb') as tempf:
+        call('''v4l2-ctl --device="/dev/v4l/by-path/platform-30b80000.csi-video-index0" --set-fmt-video=width=1052,height=780,pixelformat=GRBG --stream-mmap --stream-skip=3 --stream-count=1 --stream-to={}'''.format(tempf.name))
+
+        return ((1052, 780), tempf.read())
+
+
+if __name__ == '__main__':
+    yad("--form --text 'Please point the big camera towards a white surface and press OK'")
+    time.sleep(3)  # give the user some time to place the phone in a rig or whatever
+    (width, height), raw_bytes = use_big_camera()
+    raw_picture = np.frombuffer(
+        raw_bytes, np.dtype('u1'), width * height
+    ).reshape((height, width))
+    demosaic = cv2.cvtColor(raw_picture, cv2.COLOR_BAYER_GR2RGB)
+    yad("--form --text 'Once you click OK, a picture will appear. Please check it for optical problems like specks, and then close it.'")
+
+    with NamedTemporaryFile(suffix='.png', mode='rb') as png:
+        cv2.imwrite(png.name, demosaic)
+        subprocess.check_call(['xdg-open', png.name])
+
+        yad("--image dialog-question --title 'Camera evaluation' --button=No:1  --button=Yes:0 --text 'Is the picture free from optical problems like specks?'")