Implementation of Image Compression Using Hybrid DWT- DCT Algorithms

This paper describes architecture of DCT and DWT standard of an image compression. It is used specially for the compression of images where tolerable degradation is required. The discrete cosine transform is a fast transform and has fixed basis images which gives good compromise between information packing ability and computational complexity. DWT can be used to reduce the image size without losing much of the resolutions computed and values less than a pre-specified threshold. This paper covers some background of wavelet analysis, data compression and how DCT and DWT can be used for image compression and we propose a hybrid DWT-DCT algorithm for image compression and reconstruction taking benefit from the advantages of both algorithms. The algorithm performs the Discrete Cosine Transform (DCT) on the Discrete Wavelet Transform (DWT) coefficients. Index Terms — Discrete wavelet transform (DWT), image compression, wavelets, Discrete cosine transform (DCT), hybrid DWT-DCT.