Custom Extended Sobel Filters https://arxiv.org/pdf/1910.00138.pdf
sobel operator is an important edge detection operator. It is usually a convolution kernel specific numerical values of 3x3, the input image is a convolution operation.
This article analyzes why the 3x3 convolution kernel is too small, the authors tried convolution kernel 5x5,7x7,9x9 such as the size, the use of the convolution kernel as follows:
Then use a series of recall and precision to explain such a large convolution kernel is correct. Then take a look at the qualitative effect of:
Anyway explains, 3x3 too small to find a suitable size need to try, how to automatically determine the future for nuclear research needs.
