import cv2
import numpy as np
# Gaussian filter
def gaussian_filter(img, K_size=3, sigma=1.3):
if len(img.shape) == 3:
H, W, C = img.shape
else:
img = np.expand_dims(img, axis=-1)
H, W, C = img.shape
## Zero padding
pad = K_size // 2
out = np.zeros((H + pad * 2, W + pad * 2, C), dtype=np.float)
out[pad: pad + H, pad: pad + W] = img.copy().astype(np.float)
## prepare Kernel
K = np.zeros((K_size, K_size), dtype=np.float)
for x in range(-pad, -pad + K_size):
for y in range(-pad, -pad + K_size):
K[y + pad, x + pad] = np.exp( -(x ** 2 + y ** 2) / (2 * (sigma ** 2)))
K /= (2 * np.pi * sigma * sigma)
K /= K.sum()
tmp = out.copy()
# filtering
for y in range(H):
for x in range(W):
for c in range(C):
out[pad + y, pad + x, c] = np.sum(K * tmp[y: y + K_size, x: x + K_size, c])
out = np.clip(out, 0, 255)
out = out[pad: pad + H, pad: pad + W].astype(np.uint8)
return out
# Read image
img = cv2.imread("imori_noise.jpg")
# Gaussian Filter
out = gaussian_filter(img, K_size=3, sigma=1.3)
# Save result
cv2.imwrite("out.jpg", out)
cv2.imshow("result", out)
cv2.waitKey(0)
cv2.destroyAllWindows()
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图像处理_imageprocessing_python_
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图像处理的一些算法,实现了普通二值化、大津二值化、高斯滤波、灰度化、减色处理的功能
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