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How to run DWT
How to run DWT
Choose some image, convert it to grayscale.
Use dwt2, choose mode (e.g. 'zpd') and wavelet type (e.g. 'haar').
It returns 4 matrices, visualize all of them.
Quantization
Quantization
Use formula from lecture to quantize 4 results.
Choose some value of delta. (e.g. 10).
Inverse steps
Inverse steps
Multiply the results with delta and call idwt2 .
Dyadic decomposition
Dyadic decomposition
Use wavedec2. (From documentation: output decomposition structure consists of the wavelet decomposition vector C and the bookkeeping matrix S )
Perform quantization just as you did in the first part - on output C, then run inverse steps as well (use waverec2).
To extract individual level - use wrcoef2. Type parameter corresponds to following:
'a' - approximation coefficients
'V' - vertical detail coefficients
'H' - horizontal detail coefficients
'D' - diagonal detail coefficients
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