N1,N2 are the dimensions of the image. Units are pixels. A counter-clockwise rotation of the y axis to the ellipse major axis is a positive angle. Units are degrees. If N1,N2 are the dimensions of the image.
Units are pixels.
Threshold of the band of second derivatives searched by the zero crossing algorithm. A reasonable value may be determined by inspection or statistical analysis of the second derivative image. A nominal value for 16-bit intensity images might be 1000. This parameter is used to reject spurious points. NO, otherwise the task attempts to read these parameters from the image headers.