This could be a basic implementation of edge detection in images, which is useful for image registration / alignment
Staffkatamarisun
Many basic high pass filters are just gradient / derivative filters, measuring local differences in x and y, which have frequency responses with 0's near the center low frequency positions. Consider looking into Laplacian filters and Sobel filters for more examples.
This could be a basic implementation of edge detection in images, which is useful for image registration / alignment
Many basic high pass filters are just gradient / derivative filters, measuring local differences in x and y, which have frequency responses with 0's near the center low frequency positions. Consider looking into Laplacian filters and Sobel filters for more examples.