我可以使用dcpm无损地解码视频

Question

我正在尝试使用DCPM技术无误地编码和解码视频，该技术指出您将视频的第一帧发送为原样，然后将差异计算为currentframe -POSTERFRAME -POSTER FRAME FRAME和您发送此序列，直到视频已完全编码为止。在第一个文件中，我这样做，似乎可以正常工作。

现在，当我尝试解码时，我显示第一个帧，然后计算“ FirstFrame + NextFrame”，并显示此序列，直到结束，这应该导致真实视频，因为第一个帧完好无损，下一个是在第二帧和第一帧。但是，当我这样做的过程中，我会收到一堆噪音，并且视频并未无误地解码。这是为什么？

以下是编码器

import cv2
import numpy as np

video = cv2.VideoCapture('video.mp4')
previous_frame = None

video_codec = cv2.VideoWriter_fourcc(*'XVID')

# Setup the output
output = cv2.VideoWriter('dpcm_encoded_video.avi', video_codec, int(video.get(5)),
(int(video.get(3)), int(video.get(4))), False)

if not video.isOpened():
    print("Error while trying to play the video.")
i = 0
while video.isOpened():
    not_exception, current_frame = video.read()
    if not_exception:
        if previous_frame is None:  # First iteration
            current_frame = cv2.cvtColor(current_frame, cv2.COLOR_RGB2GRAY)
            previous_frame = current_frame
            output.write(current_frame)
            continue
        if i <= 217: #Video is 217 frames
            current_frame = cv2.cvtColor(current_frame, cv2.COLOR_RGB2GRAY)
            i += 1

        difference = current_frame - previous_frame
        cv2.imshow('Error frames', difference)
        output.write(difference)
        previous_frame = current_frame

        if cv2.waitKey(10) == ord('q'):
            break
    else:
        break

video.release()
cv2.destroyAllWindows()

和解码器

import cv2
# Load video
video = cv2.VideoCapture('dpcm_encoded_video.avi')

# Load the first frame of the video
success, first_frame = video.read()
first_frame = cv2.cvtColor(first_frame, cv2.COLOR_BGR2GRAY)

# Set video codec
video_codec = cv2.VideoWriter_fourcc(*'XVID')

# Setup the output
output = cv2.VideoWriter('dpcm_decoded_video.avi', video_codec, int(video.get(5)), (int(video.get(3)), int(video.get(4))), False)
output.write(first_frame)

frame_num = 0

previous_frame = first_frame

while video.isOpened():
    # Skip the first frame because we load it outside the loop
    if frame_num == 0:
        #success, current_frame = video.read()
        frame_num += 1
        continue

    success, current_frame = video.read()
    frame_num += 1

    if not success:
        break

    # Frame to BW
    current_frame = cv2.cvtColor(current_frame, cv2.COLOR_BGR2GRAY)

    # Sum frames
    current_frame = previous_frame + current_frame

    previous_frame = current_frame
    output.write(current_frame)

video.release()
output.release()