Low rank approximation of grayscale image based on SVD
Eckhart, University of Chicago

See svd_eckhart.jl for the detail.

Reading RGB Image Original Grayscale Image A=A(480)
480 by 640 matrix, rank(A)=480
A(10): the best approximation by matirices of rank 10 A(40): the best approximation by matirices of rank 40
A(70): the best approximation by matirices of rank 70 A(100): the best approximation by matirices of rank 100