Low rank approximation of grayscale image based on SVD
flowers

See svd_gbb2_a.m and svd_gbb2_b.m for the detail.

Original RGB Image Original Image and Approximations
Original Grayscale Image A=A(365)
365 by 548 matrix, rank(A)=365
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