opencv-python视频处理之白闪效果
import cv2import numpydef gamma_t(image,gamma):gamma_ta=[numpy.power(x/255,gamma)*255 for x in range(256)]gamma_ta=np.round(np.array(gamma_ta)).astype(np.uint8)return cv2.LUT(image,gamma_ta)def main_g():vc = cv2.VideoCapture('sample.mp4')c = 1cout = 5 # 帧数fps = vc.get(cv2.CAP_PROP_FPS)fourcc = cv2.VideoWriter_fourcc(*'MJPG')video_writer = cv2.VideoWriter("img_shake.mp4", fourcc, fps, (640, 480))while vc.isOpened():rval, frame = vc.read()# 每5帧抖动一次if (c % 5 == 0 or 0 < cout < 5):dst = gamma_t(frame,0.3)video_writer.write(dst)else:# 这里可以控制帧数cout = 5cv2.imshow("dst", frame)video_writer.write(frame)c = c + 1cv2.waitKey(1)vc.release()利用特效图片
import cv2import numpy as npdef main_ts() :img=cv2.imread('sss.jpg')height,width, n=img. shape
mask=cv2.imread('sss.jpg')#特效图片，mask=cv2.resize (mask, (width, height) ,interpolation=cv2.INTER_CUBIC)dst=cv2.addWeighted(img,0.6,mask,0.4,0)cv2. imshow ("demo", dst)cv2.waitKey(0)