Influence of block size on JPEG compression performance

This paper focuses on investigating the block size influence on the performance of the JPEG compression process. Apart from 8x8 blocks, 4x4,16x16 and 32x32 block sizes are also tested. A variable size block division is also investigated. As a quality measure, peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM) are calculated. The compression ratios (CR) for each case are compared also.