Low rank approximation of grayscale image based on SVD
shaved ice

See svd_shaved_ice_a.m and svd_shaved_ice_b.m for the detail.

Original RGB Image Original Image and Approximations
Original Grayscale Image A=A(480)
448 by 794 matrix, rank(A)=448
A(20): the best approximation by matirices of rank 20
A(50): the best approximation by matirices of rank 50 A(80): the best approximation by matirices of rank 80