中文说明：函数imP=
English Description：
function imP = ImToPolar (imR, rMin, rMax, M, N) % IMTOPOLAR converts rectangular image to polar form. The output image is % an MxN image with M points along the r axis and N points along the theta % axis. The origin of the image is assumed to be at the center of the given % image. The image is assumed to be grayscale. % Bilinear interpolation is