中文说明：通过高斯函数导数检测图像边缘，实质是方向可调小波变换检测图像边缘（8个方向变换）。
English Description：
The essence of detecting image edge by derivative of Gaussian function is to detect image edge by direction adjustable wavelet transform (8-direction transform).
Image edge detection by derivative of Gaussian function
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中文说明：通过高斯函数导数检测图像边缘，实质是方向可调小波变换检测图像边缘（8个方向变换）。
English Description：
The essence of detecting image edge by derivative of Gaussian function is to detect image edge by direction adjustable wavelet transform (8-direction transform).