28 lines
572 B
Python
28 lines
572 B
Python
import cv2 as cv
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import matplotlib.pyplot as plt
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import numpy as np
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img = cv.imread(r"img\peppers.bmp", 0)
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m, n = img.shape
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if m % 2 == 0:
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m = m + 1
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if n % 2 == 0:
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n = n + 1
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img = cv.resize(img, (m, n))
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f = np.fft.fft2(img)
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fshift = np.fft.fftshift(f)
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fmax = np.max(np.abs(fshift))
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u0, v0 = (m - 1) // 2, (n - 1) // 2
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u1 = u0 - 40
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v1 = v0 + 40
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fshift[v1, u1] = fmax / 5
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u2 = m - 1 - u1
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v2 = n - 1 - v1
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fshift[v2, u2] = fmax / 5
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f1 = np.fft.ifftshift(fshift)
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img1 = abs(np.fft.ifft2(f1))
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plt.imshow(img1, cmap="gray")
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plt.axis("off")
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plt.tight_layout()
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plt.show()
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