compression ratio - MULTIMEDIA

The compression ratio for image data using lossless compression techniques (e.g., Huffman Coding, Arithmetic Coding, LZW) is low when the image histogram is relatively fiat. For image compression in multimedia applications, where a higher compression ratio is required, lossy methods are usually adopted. In lossy compression, the compressed image is usually not the same as the original image but is meant to form a close approximation to the original image perceptually. To quantitatively describe how close the approximation is to the original data, some form of distortion measure is required.


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