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Optimal Quantization / Adaptive Quantization for image

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E

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optimal & adaptive quantization

I am doing a project about image compression in which I decided to build an encoder and a decoder using Matlab.

The encode algorithm is:
Read image -> 8x8 2D-DCT -> Optimal Quantization -> Huffman coding

However, I have no idea about how to construct the optimal quantization. I know jpeg use a standard quantization matrix, is there other method to quantize the DCT coefficient?
 

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