图像处理篇-python将图像转换为灰度图像

操作系统 ubuntu16.04

python版本：3.6.3

import cv2
from PIL import Image
import numpy as np
imagepath=r'./head.jpg'
image = cv2.imread(imagepath)

#gray=cv2.cvtColor(image,cv2,COLOR_BGR2GRAY)
cv2.imshow("Image Title",image)

#gray=Image.open('head.jpg').convert('L')
a = np.array(Image.open("./head.jpg").convert('L')).astype('float')

depth = 10.
grad = np.gradient(a)
grad_x, grad_y = grad

grad_x = grad_x*depth/100.
grad_y = grad_y*depth/100.
A = np.sqrt(grad_y**2+grad_y**2+1)
uni_x = grad_x/A
uni_y = grad_y/A
uni_z = 1./A

vec_el = np.pi/2.2
vec_az = np.pi/4
dx = np.cos(vec_el)*np.cos(vec_az)
dy = np.cos(vec_el)*np.sin(vec_az)
dz = np.sin(vec_el)

b = 255*(dx*uni_x+dy*uni_y+dz*uni_z)
b = b.clip(0, 225)

im = Image.fromarray(b.astype('uint8'))
im.save('./gray.jpg')
im.show()
#cv2.imshow("gray ",gray)
cv2.waitKey(0)

运行

python3 face2.py 

参考：https://blog.csdn.net/qq_34246164/article/details/81448432