我有一个视频,我需要使用光流模拟帧;即具有一帧,并且表示下一帧像素平移的光流将模拟此后续结果帧。
我正在按如下方式使用Python和OpenCV:
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
flow = cv2.calcOpticalFlowFarneback(prev_gray, gray, None, pyr_scale = 0.5, levels = 5, winsize = 11, iterations = 5, poly_n = 5, poly_sigma = 1.1, flags = 0)
这是第一帧和第二帧之间的流:
这是以下(目标帧):
height = flow.shape[0]
width = flow.shape[1]
R2 = np.dstack(np.meshgrid(np.arange(width), np.arange(height)))
pixel_map = R2 + flow
prev = original_frames[0].astype("float32")
pixel_map = pixel_map.astype("float32")
new_frame = cv2.remap(prev, pixel_map, None, cv2.INTER_LINEAR)
生成的图像是:
解决了该问题,对代码进行了如下更新:
h = flow.shape[0]
w = flow.shape[1]
flow[:,:,0] += np.arange(w)
flow[:,:,1] += np.arange(h)[:,np.newaxis]
new_frame = cv2.remap(original_frame, flow, None, cv2.INTER_LINEAR)