Perceptual Colour Image Compression
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 7
Abstract
Perceptual coding technique discriminate the signal components which are detected and not detected by the human eye. There are a number of well accepted perceptual factors which influence the visibility of distortions in an image. This factors are used in the image compression schemes to obtain a better visual quality compressed image with improved compression. A perceptual compression of RGB colour image employing DWT is done here, which uses Contrast Sensitivity Function curve as the perceptual factor at the quantization stage. Initially RGB colour image is mapped to YCbCr component by irreversible component transformation and then DWT is applied to each component separately. Quantization is done to each component. Quantization step required for luminance component is determined by using Contrast Sensitivity Function curve. Huffman and Run-length encoding is done to the quantized components to achieve further compression. Thus by adopting the properties of the Human Visual System at the quantization stage of the compression a better visible quality compressed image can be obtained.
Authors and Affiliations
Anish Kumar K, Sreeleja N Unnithan
Keywords
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