cv.preCornerDetect - MATLAB File Help
cv.preCornerDetect

Calculates a feature map for corner detection

dst = cv.preCornerDetect(src)
dst = cv.preCornerDetect(src, 'OptionName', optionValue, ...)

Input

Output

Options

The function calculates the complex spatial derivative-based function of the source image.

dst = (Dx*src)^2*Dyy*src + (Dy*src)^2*Dxx*src - 2*Dx*src*Dy*src*Dxy*src

where Dx, Dy are the first image derivatives, Dxx, Dyy are the second image derivatives, and Dxy is the mixed derivative.

The corners can be found as local maximums of the functions, as shown below:

corners = cv.preCornerDetect(image, 'KSize',3);

% dilation with 3x3 rectangular structuring element
dilated_corners = cv.dilate(corners);
corner_mask = (corners == dilated_corners);
See also