A modified hybrid DWT-SVD image-coding system (HDWTSVD) for monochromatic images

In this paper, we propose a modification of the HDWTSVD system to encode monochromatic images. The modification was carried out in the SVD encoder, where the eigenvalues and eigenvectors are scalar and vector quantized respectively. If the MSE of the first three eigenvectors, with respect to the codevectors in the codebooks, is greater than a threshold then, the eigenvectors are scalar quantized and sent, otherwise the indices of the codevectors are sent. The remaining eigenvectors are quantized using small codebooks. Results show that the algorithm performs well for bitrates above and below 1 bpp.