Low rank approximation of grayscale images based on SVD
flowers

See svd_gbb2.jl for the detail.

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