图片锐化

锐化：会让图片的轮廓更加明显（仔细观察效果图，原本暗的地方变更亮了）

import cv2

import numpy as np

image = cv2.imread('images/Hillary.jpg')

kerel_sharpening = np.array([[-1,-1,-1],

                          [-1,9,-1],

                          [-1,-1,-1]])

sharpened = cv2.filter2D(image,-1,kerel_sharpening)

cv2.imshow("sharpened",sharpened)

cv2.waitKey()