Hybrid Color Image Compression based DPCM and Slant Transform

Abstract

Nowadays, still images are usedeverywhere in the digital world. Images takelot of computer space, in many practicalsituations, all original images cannot bestored, and a compression must be used.Moreover, in many such situations,compression ratio provided by even the bestlossless compression is not sufficient, so lossycompression is used.In this paper ,Differential pulse codemodulation (DPCM) in slantlet transformand Run Length Code for image compressionis used.Apply slantlet transform on eachcomponent in the color image(after applyingcolor space conversion from RGB toYCbCr)and encoding Y component by DPCMand encoding Cb and Cr with RLC.Thecompression ratio and Peak Signal to NoiseRatio (PSNR) are used as measurement tools.When comparing the proposed approach withother compression methods Good resultobtained.