python 12 实例

 

https://blog.csdn.net/Python_xiaowu/article/details/122071787

#素描
import cv2
image = cv2.imread("31.png")
cv2.imshow("this", image)
#cv2.waitKey(0)
#waitKey(delay )在一个给定的时间内(单位ms)等待用户按键触发
#延时delay = 0 函数则延时无限长，必须有键按下才继续执行
#延时delay > 0 函数返回值为按下的键的ASCII码值，超时则返回-1
#waitKey(0),表示程序会无限制的等待用户的按键事件；
#waitKey(1),表示程序每1ms检测一次按键，检测到返回按键值，检测不到返回-1；
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) #图片转灰度
# cv2.imshow("New", gray_image)
# cv2.waitKey(0)
inverted_image = 255 - gray_image
# v2.imshow("Inverted", inverted_image)
# cv2.waitKey()
blurred = cv2.GaussianBlur(inverted_image, (21, 21), 0) #高斯滤波GaussianBlur
inverted_blurred = 255 - blurred
pencil_sketch = cv2.divide(gray_image, inverted_blurred, scale=256.0) #分割
# cv2.imshow("Sketch", pencil_sketch)
# cv2.waitKey(0)
# cv2.imshow("original image", image)
cv2.imshow("pencil sketch", pencil_sketch)
cv2.waitKey(0)