A modified hybrid DCT-SVD image-coding system for color image

Abstract

We propose a modified hybrid DCT-SVD image-coding system (MHDCTSVD) to encode both monochromatic and color images. The color (RGB) components are transformed into YCbCr. Cb and Cr components are downsampled by a factor of two along both the horizontal and vertical directions. The standard deviation of 8/spl times/8 blocks of the Y component is used to select between DCT and SVD. The DCT is used to transform the highly correlated blocks of the YCbCr components, while the SVD is used to transform blocks with low correlation. The simulation results show good image quality at low bit rates compared with the conventional hybrid DCT-SVD image-coding algorithm.