80 lines
2.2 KiB
Python
80 lines
2.2 KiB
Python
import random as rd
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import numpy as np
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import cv2 as cv
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import matplotlib.pyplot as plt
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def addSaltAndPepper(src, percentage):
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NoiseImg = src.copy()
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NoiseNum = int(percentage * src.shape[0] * src.shape[1])
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for i in range(NoiseNum):
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randX = rd.randint(0, src.shape[0] - 1)
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randY = rd.randint(0, src.shape[1] - 1)
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if rd.randint(0, 1) == 0:
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NoiseImg[randX, randY] = 0
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else:
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NoiseImg[randX, randY] = 255
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return NoiseImg
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def addGaussianNoise(src, means, sigma):
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NoiseImg = src / src.max()
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rows = NoiseImg.shape[0]
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cols = NoiseImg.shape[1]
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for i in range(rows):
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for j in range(cols):
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NoiseImg[i, j] = NoiseImg[i, j] + rd.gauss(means, sigma)
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if NoiseImg[i, j] < 0:
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NoiseImg[i, j] = 0
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if NoiseImg[i, j] > 1:
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NoiseImg[i, j] = 1
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NoiseImg = np.uint8(NoiseImg * 255)
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return NoiseImg
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if __name__ == "__main__":
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im = cv.imread(r"img\iris.jpg", cv.IMREAD_GRAYSCALE)
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im1 = addSaltAndPepper(im, 0.1)
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im11 = cv.blur(im1, (3, 3))
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im12 = cv.medianBlur(im1, 3)
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im13 = cv.GaussianBlur(im1, (3, 3), 1)
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im2 = addGaussianNoise(im, 0, 0.1)
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im21 = cv.blur(im2, (3, 3)) # type: ignore
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im22 = cv.medianBlur(im2, 3) # type: ignore
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im23 = cv.GaussianBlur(im2, (3, 3), 1) # type: ignore
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plt.figure()
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plt.subplot(241)
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plt.imshow(im1, cmap="gray")
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plt.title("salt and pepper")
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plt.axis("off")
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plt.subplot(242)
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plt.imshow(im11, cmap="gray")
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plt.title("blur")
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plt.axis("off")
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plt.subplot(243)
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plt.imshow(im12, cmap="gray")
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plt.title("median")
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plt.axis("off")
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plt.subplot(244)
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plt.imshow(im13, cmap="gray")
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plt.title("gaussian")
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plt.axis("off")
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plt.subplot(245)
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plt.imshow(im2, cmap="gray")
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plt.title("gaussian noise")
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plt.axis("off")
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plt.subplot(246)
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plt.imshow(im21, cmap="gray")
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plt.title("blur")
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plt.axis("off")
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plt.subplot(247)
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plt.imshow(im22, cmap="gray")
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plt.title("median")
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plt.axis("off")
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plt.subplot(248)
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plt.imshow(im23, cmap="gray")
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plt.title("gaussian")
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plt.axis("off")
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plt.tight_layout()
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plt.show()
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