Abstract
Image compression is a widely addressed researched area. Despite rapid progress in mass- storage density, processor speeds, and digital communication system performance, demand for data storage capacity and data-transmission bandwidth continues to outstrip the capabilities of available technologies. Wavelet transform is generated from orthogonal transform .Image compression using hybrid wavelet transform is proposed here by using two orthogonal transform. Hybrid wavelet transform are generated using orthogonal transforms alias DCT, DHT, DWT, DKT transform .Different color images of size 256x256 are used for experimentation. Proposed hybrid wavelet transform is applied on red, green and blue planes of image separately. Then in each plane transformed coefficients are sorted in descending order of their energy and lowest energy coefficients are eliminated. Root mean square error between original image and reconstructed image is calculated to check the performance at different compression ratios. Hybrid of DCT and DKT gives the best results among the combination of mentioned image transforms used for generating hybrid wavelet transforms. Keyword: DCT, DHT ,DKT, DWT, Hybrid wavelet transform, RMSE, PSNR.
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