gil/example/hessian.md

Hessian Feature Detection

Hessian feature detection capabilities in GIL are demonstrated by the program hessian, compiled from the sources example/hessian.cpp.

Synopsis

hessian input.png window-size hessian-threshold output.png

• The first parameter must be the full path to an existing image in the PNG format for hessian to process
• The second parameter is the size of the window containing the pixels to analyse and must be an odd number (e.g. 9 for a 3x3 matrix)
• The third parameter is the hessian threshold used to identify the optimal values
• The fourth and last parameter is the full path to the output image of hessian. 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

• hessian has no specific execution requirements.