Function opencv::imgproc::pre_corner_detect

pub fn pre_corner_detect(
    src: &dyn ToInputArray, 
    dst: &mut dyn ToOutputArray, 
    ksize: i32, 
    border_type: i32
) -> Result<()>

Calculates a feature map for corner detection.

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

where , are the first image derivatives, , are the second image derivatives, and is the mixed derivative.

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

Mat corners, dilated_corners;
preCornerDetect(image, corners, 3);
// dilation with 3x3 rectangular structuring element
dilate(corners, dilated_corners, Mat(), 1);
Mat corner_mask = corners == dilated_corners;

Parameters

• src: Source single-channel 8-bit of floating-point image.
• dst: Output image that has the type CV_32F and the same size as src .
• ksize: %Aperture size of the Sobel .
• borderType: Pixel extrapolation method. See #BorderTypes.

C++ default parameters

• border_type: BORDER_DEFAULT