Corner detection on a subpart of an image

Hi

I would like to do corner detection on a subpart of an image using Computer Vision System Toolbox. For example using:

% FAST algorithm by Rosten & Drummond
hCornerDet = vision.CornerDetector('Method','Local intensity comparison (Rosten & Drummond)');

pts = step(hCornerDet, I);

I can get the allowed pixels from regionprops or use ginput() to get the corners of the region to do corner detection on.

I don't want to search the whole image and remove detected corners outside the wanted area afterwords.

Any suggestions?

Answer 1

[Image Analyst]

I suggest you explain better what "remove" means. Does that mean that you want to set those pixels to black?

[Tobias Pahlberg]

From the corner detection function I get x, and y position of the corners. I don't want the x, and y positions of the corners that are on a totally black border.

I don't want these rows in the "pts"-vector to begin with, but I don't know if it's possible to alter the code in that way?