N2 is the second dimension of the image. Units are pixels. N1,N2 are the dimensions of the image. Units are pixels. 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.