如何用opencv锐化图像
如何用opencv锐化图像看过很多opencv对图像的处理,但是我要怎么才能对图像进行锐化处理呢
锐化的作用是加强图像的边沿和轮廓,通常也成为高通滤波器:
模板一般设计为中心处的值为正,外围的值为负(总系数之和为0)
import cv2
import numpy as np
img=cv2.imread("messi5.jpg")
# 1
blur=cv2.GaussianBlur(img,(0,0),3)
image=cv2.addWeighted(img,1.5,blur,-0.5,0)
# 2
kernel = np.array([[-1,-1,-1], [-1,9,-1], [-1,-1,-1]])
image = cv2.filter2D(img, -1, kernel)
# 3
image=cv2.bilateralFilter(img,9,75,75)
# 4
sigma = 1; threshold = 5; amount = 1
blurred=cv2.GaussianBlur(img,(0,0),1,None,1)
lowContrastMask = abs(img - blurred) < threshold
sharpened = img*(1+amount) + blurred*(-amount)
image=cv2.bitwise_or(sharpened.astype(np.uint8),lowContrastMask.astype(np.uint8))
cv2.namedWindow("dst",cv2.WINDOW_FREERATIO)
cv2.imshow("dst",image)
cv2.waitKey(0)
cv2.destroyAllWindows()
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