convertion of 64 coefficients into 12 coefficients

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jenifer 2013-1-21

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hi.. i want to extract the color feature.. for that i m using color layout descriptor.. in this process i had find the 64 dct coefficients for each Y, Cb,Cr color space... now in my paper they recommended to use 12 coeffients.. 6 for Y and 3 for Cb,Cr... how can convert like this... please help me with matlab codes...

thanks in advance..

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Answer 1

Walter Roberson 2013-1-21

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reduced_Y_dct = y_dct(1:6);

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jenifer 2013-1-21

sir they mentioned " first few coefficients are non linearly quantized using 64 and 32 for DC and AC coefficients"..

Walter Roberson 2013-1-21

I do not see the relevance of that. You asked how to reduce down to 6 coefficients for Y and I showed you. If you want to reduce to a particular number of DC coefficients and a particular number of AC coefficients, then say so, and indicate which variables the DC and AC coefficients are stored in.

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