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import sys
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import cv2
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import numpy as np
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import matplotlib.pyplot as plt
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def Canny(img_path, low, high):
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img = cv2.imread(img_path, 0) # 读取图片
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gradx = cv2.Sobel(img, cv2.CV_16SC1, 1, 0)
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grady = cv2.Sobel(img, cv2.CV_16SC1, 0, 1)
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# 使用Canny函数处理图像，x,y分别是3求出来的梯度，低阈值50，高阈值150
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edge_output = cv2.Canny(gradx, grady, low, high)
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cv2.imwrite('./output/Canny.jpg', edge_output)
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'''
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输入：一张灰度图 ，低阈值，高阈值
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输出：Canny边缘检测的结果
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'''
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if __name__ == '__main__':
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Canny(sys.argv[1], eval(sys.argv[2]), eval(sys.argv[3]))
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