Add 3

1/6.py

@@ -6,4 +6,5 @@ plt.rcParams["axes.unicode_minus"] = False
 img_BGR = cv.imread(r"img\iris.jpg")
 img_RGB = cv.cvtColor(img_BGR, cv.COLOR_BGR2RGB)
 plt.imshow(img_RGB)
+plt.axis("off")
 plt.show()

1/7.py

@@ -30,6 +30,7 @@ if __name__ == "__main__":
     plt.subplot(1, 2, 1)
     plt.imshow(image0, vmin=0, vmax=255, cmap=plt.cm.gray)  # type: ignore
     plt.title("idel image")
+    plt.axis("off")
     image_hist0 = histogram(image0)
     plt.subplot(1, 2, 2)
     plt.bar(range(256), image_hist0)

2/1.py

@@ -29,15 +29,19 @@ if __name__ == "__main__":
     plt.subplot(241)
     plt.imshow(im1, cmap="gray")
     plt.title("darker")
+    plt.axis("off")
     plt.subplot(242)
     plt.imshow(im2, cmap="gray")
     plt.title("brighter")
+    plt.axis("off")
     plt.subplot(243)
     plt.imshow(im3, cmap="gray")
     plt.title("lower contrast")
+    plt.axis("off")
     plt.subplot(244)
     plt.imshow(im4, cmap="gray")
     plt.title("equalized")
+    plt.axis("off")
     plt.subplot(245)
     plt.hist(im1.flatten(), 256, [0, 256])  # type: ignore
     plt.subplot(246)

2/2.py

@@ -17,10 +17,13 @@ if __name__ == "__main__":
     plt.subplot(131)
     plt.imshow(im, cmap="gray")
     plt.title("original")
+    plt.axis("off")
     plt.subplot(132)
     plt.imshow(im1, cmap="gray")
     plt.title("gamma = 0.5")
+    plt.axis("off")
     plt.subplot(133)
     plt.imshow(im2, cmap="gray")
     plt.title("gamma = 1.5")
+    plt.axis("off")
     plt.show()

2/3.py

@@ -16,13 +16,17 @@ if __name__ == "__main__":
     plt.subplot(221)
     plt.imshow(ImgSmoothed1, cmap="gray")
     plt.title("smoothed1")
+    plt.axis("off")
     plt.subplot(222)
     plt.imshow(ImgSmoothed2, cmap="gray")
     plt.title("smoothed2")
+    plt.axis("off")
     plt.subplot(223)
     plt.imshow(ImgSmoothed3, cmap="gray")
     plt.title("smoothed3")
+    plt.axis("off")
     plt.subplot(224)
     plt.imshow(ImgSharp, cmap="gray")
     plt.title("sharp")
+    plt.axis("off")
     plt.show()

2/4.py

@@ -46,25 +46,33 @@ if __name__ == "__main__":
     plt.subplot(241)
     plt.imshow(im1, cmap="gray")
     plt.title("salt and pepper")
+    plt.axis("off")
     plt.subplot(242)
     plt.imshow(im11, cmap="gray")
     plt.title("blur")
+    plt.axis("off")
     plt.subplot(243)
     plt.imshow(im12, cmap="gray")
     plt.title("median")
+    plt.axis("off")
     plt.subplot(244)
     plt.imshow(im13, cmap="gray")
     plt.title("gaussian")
+    plt.axis("off")
     plt.subplot(245)
     plt.imshow(im2, cmap="gray")
     plt.title("gaussian noise")
+    plt.axis("off")
     plt.subplot(246)
     plt.imshow(im21, cmap="gray")
     plt.title("blur")
+    plt.axis("off")
     plt.subplot(247)
     plt.imshow(im22, cmap="gray")
     plt.title("median")
+    plt.axis("off")
     plt.subplot(248)
     plt.imshow(im23, cmap="gray")
     plt.title("gaussian")
+    plt.axis("off")
     plt.show()

2/5.py

@@ -12,10 +12,13 @@ if __name__ == "__main__":
     plt.subplot(131)
     plt.imshow(img, cmap="gray")
     plt.title("original")
+    plt.axis("off")
     plt.subplot(132)
     plt.imshow(ImgLplc, cmap="gray")
     plt.title("laplacian")
+    plt.axis("off")
     plt.subplot(133)
     plt.imshow(ImgLplcEnhance, cmap="gray")
     plt.title("laplacian enhanced")
+    plt.axis("off")
     plt.show()

3/1.py

@@ -0,0 +1,58 @@
+import cv2 as cv
+import numpy as np
+import matplotlib.pyplot as plt
+
+plt.rcParams["font.family"] = ["SimSun"]
+src = cv.imread(r"img\peppers.bmp", cv.IMREAD_GRAYSCALE)
+
+dft0 = cv.dft(np.float32(src), flags=cv.DFT_COMPLEX_OUTPUT)  # type: ignore
+row, col = src.shape[:2]
+src1 = np.zeros((row, col), dtype=np.float32)
+for i in range(row):
+    for j in range(col):
+        src1[i, j] = src[i, j] * ((-1) ** (i + j))
+dft1 = cv.dft(src1, flags=cv.DFT_COMPLEX_OUTPUT)
+magnitude0 = cv.magnitude(dft1[:, :, 0], dft1[:, :, 1])
+magnitude1 = 20 * np.log(1 + magnitude0)  # type: ignore
+phase = cv.phase(dft1[:, :, 0], dft1[:, :, 1])
+idft0 = cv.idft(dft0)
+idft1 = cv.magnitude(idft0[:, :, 0], idft0[:, :, 1])
+
+fft2 = np.fft.fft2(src)
+fftshift = np.fft.fftshift(fft2)
+abs0 = np.abs(fftshift)
+abs1 = 20 * np.log(1 + abs0)
+angle = np.angle(fftshift)
+ifft20 = np.fft.ifft2(fftshift)
+ifft21 = np.abs(ifft20)
+
+plt.figure()
+plt.subplot(2, 4, (1, 5))
+plt.title("输入图像")
+plt.imshow(src, cmap="gray")
+plt.axis("off")
+plt.subplot(2, 4, 2)
+plt.title("幅值谱（OpenCV）")
+plt.imshow(magnitude1, cmap="gray")
+plt.axis("off")
+plt.subplot(2, 4, 3)
+plt.title("相位谱（OpenCV）")
+plt.imshow(phase, cmap="gray")
+plt.axis("off")
+plt.subplot(2, 4, 4)
+plt.title("重构图像（OpenCV）")
+plt.imshow(idft1, cmap="gray")
+plt.axis("off")
+plt.subplot(2, 4, 6)
+plt.title("幅值谱（NumPy）")
+plt.imshow(abs1, cmap="gray")
+plt.axis("off")
+plt.subplot(2, 4, 7)
+plt.title("相位谱（NumPy）")
+plt.imshow(angle, cmap="gray")
+plt.axis("off")
+plt.subplot(2, 4, 8)
+plt.title("重构图像（NumPy）")
+plt.imshow(ifft21, cmap="gray")
+plt.axis("off")
+plt.show()