Transform a matrix to the integral matrix.
Allocate and initialize the internal structure for building a pyramid matrix array.
Build a pyramid matrix array.
Free resources allocated by the hppiInitAllocPyramid function.
Create a binary image of source image edges using derivatives of the first order.
Extract corners from the source matrix and put them into the destination array.
Detect corners using the FastN algorithm.
Compute the gradient vector for each element of a matrix.