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from matplotlib import pyplot as plt
import cv2
import numpy as np
img = cv2.imread("1i.png", 0)
laplacian = cv2.Laplacian(img, -1, None, 3)
robert_x_kernel = np.array([[-1, 0], [0, 1]])
robert_y_kernel = np.array([[0, -1], [1, 0]])
robert_x = cv2.filter2D(img, -1, robert_x_kernel)
robert_y = cv2.filter2D(img, -1, robert_y_kernel)
robert_combined = cv2.bitwise_or(robert_x, robert_y)
prewitt_x_kernel = np.array([[-1, -1, -1], [0, 0, 0], [1, 1, 1]])
prewitt_y_kernel = np.array([[-1, 0, 1], [-1, 0, 1], [-1, 0, 1]])
prewitt_x = cv2.filter2D(img, -1, prewitt_x_kernel)
prewitt_y = cv2.filter2D(img, -1, prewitt_y_kernel)
prewitt_combined = cv2.bitwise_or(prewitt_x, prewitt_y)
sx = cv2.Sobel(img, cv2.CV_64F, 1, 0)
sy = cv2.Sobel(img, cv2.CV_64F, 0, 1)
sobel_x = np.uint8(np.absolute(sx))
sobel_y = np.uint8(np.absolute(sy))
sobel_combined = cv2.bitwise_or(sobel_x, sobel_y)
empty = np.zeros(img.shape, dtype=np.uint8)
data = [
(img, "Original Image"),
(laplacian, "Laplacian"),
(robert_x, "Robert in x direction"),
(robert_y, "Robert in y direction"),
(robert_combined, "Combined Robert"),
(prewitt_x, "Prewitt in x direction"),
(prewitt_y, "Prewitt in y direction"),
(prewitt_combined, "Combined Prewitt"),
(sobel_x, "Sobel in x direction"),
(sobel_y, "Sobel in y direction"),
(sobel_combined, "Combined Sobel"),
(empty, ""),
]
fig, axs = plt.subplots(3, 4, figsize=(10, 7))
for ax, (image, title) in zip(axs.flat, data):
if image is not img:
image = 255 - image
ax.imshow(cv2.cvtColor(image, cv2.COLOR_BGR2RGB))
ax.set_title(title, fontsize=10)
ax.axis("off")
plt.tight_layout()
plt.savefig("14.svg")
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