public interface HarrisCornerIntensity
The Harris corner detector  is similar to the
ShiTomasiCornerIntensitybut avoids computing the eigenvalues directly. In theory this should be more computationally efficient.
corner = det(D) + k*trace(D)2
where D is the deformation matrix (see
GradientCornerIntensity), and k is a tunable scalar.
k typically has a small value, for example 0.04.