Low Complexity Scheme with JPEG-LS for Near-Lossless, Multicomponent and Selective Compression

This study focuses on improving capabilities of a single-band lossless JPEG-LS encoder with a preprocessing unit. Main motivation is preserving its genuine low complexity that enables high-throughput hardware implementations. Although JPEG-LS standard describes procedures for near-lossless and multicomponent compression, a conveniently designed preprocessor unit can easily bestow any single-band lossless JPEG-LS encoder gain these capabilities without change on itself. Similarly, its compression performance can be improved with selective compression. Idea depends on the detection of regions out-of-interest (cloud, snow etc.) employing their distinct spectral signature and remapping pixels in these regions so that highest compression with the JPEG-LS can be yielded based on its algorithm. Regions out-ofinterest can be compressed regardless of the outcome quality as they contain no significant information. Through analyses are achieved on satellite images for the pre-process approaches with software. Besides, designed pre-processor units are implemented with field-programmable-gate-array (FPGA) and implementation details are provided.