图片颜色反转算法|python

算法优化

• 浮点运算转换为定点运算比较慢
• 移位运算比定点运算快

图片颜色反转

灰度图片颜色反转

# 灰度图片翻转
import cv2
import numpy as np
img = cv2.imread('image0.jpg',1)
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
dst = np.zeros((height,width,1),np.uint8)
for i in range(0,height):
	for j in range(0,width):
		grayPixel = gray[i,j]
		dst[i,j] = 255-grayPixel
cv2.imshow('dst',dst)
cv2.waitKey(0)

彩色图片颜色反转

# 彩色图片翻转
# 0-255 255-当前
import cv2
import numpy as np
img = cv2.imread('image0.jpg',1)
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
dst = np.zeros((height,width,3),np.uint8)
for i in range(0,height):
	for j in range(0,width):
		(b,g,r) = gray[i,j]
		dst[i,j] = (255-b,255-g,255-r)
cv2.imshow('dst',dst)
cv2.waitKey(0)