def bianLiang(img):
'''
图片变亮
'''
gamma=0.4
lookup=np.empty((1,256),np.uint8)
for i in range(256):
lookup[0,i]=np.clip(pow(i/255.0,gamma)*255.0,0,255)
res=cv2.LUT(img,lookup)
return res去年写的, 忘记啥意思了. 备注一下吧.