matlab function should have the following syntax: [outimg, compression_ratio, PSNR]=DCT_coding(inimg,QP,Qmatrix) Note that you can use built-in functions in MATLAB for computing 2D DCT and inverse DCT. Also, you are encouraged to use the “blkproc” function of MATLAB to speed up the processing. But this is not required.

The Discrete Cosine Transform (DCT). The one-dimensional DCT described above can be extended to apply to two-dimensional image arrays. Code to compute the DCT matrix for an N-by-N portion of a display looks somewhat like the following (adapted from The Data Compression Book by...

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