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Currently mobile digital image applications transmit a lot of images back and forth. Image compression is needed to reduce transmission payload at the expense of lower quality. At the same time, mobile devices are only expected to be equipped with lower computing power and storage. They need an efficient compression scheme especially for small images. The standard JPEG using discrete Cosine transform is a popular lossy image compression. Alternatively, this paper introduces 2x2 Tchebichefdoi:10.1109/ispacs.2011.6146066 dblp:conf/ispacs/ErnawanNA11 fatcat:bukqvlhsfndzjlei7ndytel5r4