I am trying to design a simple jpeg decoder in MATLAB. I take a .jpg image and then decoding the headers of that image. Then decode scan data after SOS header and create blocks of 64 pixels
(order of my decoding scan data: huffman decoding,Dequantization,De-zigzag,Inverse DCT,level shifting,Clamp and Convert from Ycbcr to RGB.)
I already think did above decoding process correct .I did it for every block with 64 pixels and also determine sub-sampling effect for block. now i have below structure for Y channels and also Cb and Cr channels:(suppose I have a sub sampling of factor 2 for Cb and Cr channels)
[16*16pixels] , [16*16pixels] , [16*16pixels] , [16*16pixels] , [16*16pixels] ,... ..., [16*16pixels] , [16*16pixels] .
length of above blocks array is imageWidth*imageLength/256 (suppose it divisible)
now my question is that: how i can recover whole image from above blocks,in others word, how i must sort and arrange above blocks to take a whole decoded image?