Detects corners in images.
image: Input image.
threshold: Detection threshold. This value affects both the number of detections and the detection speed. A high value means only prominent corners will be detected. The lower the value, the more corners are detected, which also means lower processing speed.
radius: Distance between pixels in gradient computation. If the image zoomed up or down by a factor, the distance should be modified by the same factor.
image: Binary output image.
coordinates: The locations (x, y) of detected points in the world coordinate system.