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Add flag to enable erasure detection

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Anthony Wang 2024-04-23 14:17:26 -04:00
parent 4b69858816
commit 6d315e7a8e
Signed by: a
SSH key fingerprint: SHA256:B5ADfMCqd2M7d/jtXDoihAV/yfXOAbWWri9+GdCN4hQ
1 changed files with 6 additions and 4 deletions
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10
decoder.py
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@ -15,6 +15,7 @@ parser.add_argument("-y", "--width", help="grid width", default=100, type=int)
parser.add_argument("-f", "--fps", help="frame rate", default=30, type=int)
parser.add_argument("-l", "--level", help="error correction level", default=0.1, type=float)
parser.add_argument("-s", "--size", help="number of bytes to decode", default=2**16, type=int)
parser.add_argument("-e", "--erasure", help="detect erasures", action="store_true")
args = parser.parse_args()
cheight = cwidth = max(args.height // 10, args.width // 10)
@ -47,9 +48,9 @@ while data is None:
ret, raw_frame = cap.read()
if not ret:
print("End of stream")
sys.exit(1)
# cv2.imshow("", raw_frame)
# cv2.waitKey(33)
break
cv2.imshow("", raw_frame)
cv2.waitKey(1)
# raw_frame is a uint8 BE CAREFUL
raw_frame = cv2.cvtColor(raw_frame, cv2.COLOR_BGR2RGB)
@ -118,7 +119,8 @@ while data is None:
frame = (frame[::2] << 4) + frame[1::2]
frame = np.pad(frame, (0, (len(frame) + 254) // 255 * 255 - len(frame)))
frame = np.ravel(frame.reshape(255, len(frame) // 255), "F")[: frame_size // 2]
data = decoder.decode(bytes(rsc.decode(frame ^ frame_xor, erase_pos=list(np.where(frame == 0)[0]))[0]))
erase_pos = list(np.where(frame == 0)[0]) if args.erasure else []
data = decoder.decode(bytes(rsc.decode(frame ^ frame_xor, erase_pos=erase_pos)[0]))
print("Decoded frame")
except KeyboardInterrupt:
sys.exit()