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import cv2
import numpy as np
import matplotlib.pyplot as plt

#读取图片
imafePath = "a28.png"
img = cv2.imread(imafePath) # img = cv2.imread(imafePath,0) 灰度读取

#进行通道转换
lenna_img = cv2.cvtColor(img,cv2.COLOR_BAYER_BG2BGR)