Applying Quantization Matrix in which specific coefficients are zero'd out
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Hello,
I'm trying to quantize 8x8 blocks using an 8x8 sample quantization matrix that I found online for image processing.
The only issue is that I want to be able to pick and choose which coefficients that I keep during quantization.
For instance if i want to zero out the circle'd portion of the matrix, how would I go about modifying my Quantization Matrix?
Sample Quantization Matrix and implementation:
Q_Matrix= [16 11 10 16 26 40 51 61
12 12 14 19 26 58 60 55
14 13 16 24 40 57 69 56
14 17 22 29 51 87 80 62
18 22 37 56 68 109 103 77
24 35 55 64 81 104 113 92
49 64 78 87 103 121 120 101
72 97 95 98 112 100 103 99];
Quantized_Matrix = floor(blocks_dct ./ Q_Matrix);
DeQuantized_Matrix = Quantized_Matrix .* Q_Matrix;
2 个评论
Image Analyst
2023-4-28
You can't have matrices with "ragged" rows or columns, so what does "get rid of" mean to you? Do you mean to set their values to zero?
KG573
2023-4-28
采纳的回答
One way would be to set Q_matrix to twice the maximum of blocks_dct. That will ensure that the floor() operation zeros them.
Another way would be to apply a binary mask to zero_out the blocks_dct ellements appropriately,
Quantized_Matrix = floor( (blocks_dct.*Mask) ./ Q_Matrix);
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