A hybrid DWT-SVD image-coding system (HDWTSVD)

In this paper, the authors proposed the HDWTSVD system to encode both monochromatic and color images. Before encoding the color images, the color components (RGB) are transformed into YCbCr. Cb and Cr components are downsampled by a factor of two, both horizontally and vertically, before sending them through the encoder. If the input is a monochromatic image, only one frame (luminance) is encoded. A criterion based on the average standard deviation of 8times8 subblocks of the Y component is used to choose DWT or SVD for all the components. Standard test images are compressed based on the proposed system