The output image names may not be equal to the input image names. If YES, the initial estimates for the ellipse parameters are taken from the values found in the input image header. If YES, the values of the ellipse parameters in the header will be updated after the parameters are determined. The x axis corresponds to the first dimension of the pixel array. N1 is the first dimension of the image.
Units are pixels.
The y axis corresponds to the second dimension of the pixel array. N2 is the second dimension of the image. Units are pixels. N1,N2 are the dimensions of the image. Units are pixels.