gil/example/sobel_scharr.md

Sobel and Scharr filters for edge detection

Edge detection via Sobel and Scharr filters capabilities in GIL are demonstrated by the program sobel_scharr, compiled from the sources example/sobel_scharr.cpp.

Synopsis

sobel_scharr input.png sobel|scharr output-x.png output-y.png

• The first argument must be the full path to an existing image in PNG format
• The second argument is the type of the filter to apply, either sobel or scharr
• The third argument is the full path to an image of the result of applying the filter in the x direction. The directory will not be created and must exist
• The fourth and last argument is the full path to an image of the result of applying the filter in the y direction. The directory will not be created and must exist.

Specific requirements

Build requirements

• A C++ compiler compliant with C++14 or above
• The PNG library installed and configured.

Execution requirements

sobek_scharr doesn't have any specific execution requirements.