How do you decompose an image in matlab code?

To decompose an image in MATLAB, you can use the im2col function to reshape the image into overlapping or non-overlapping blocks, or apply techniques like Discrete Wavelet Transform (DWT) using the wavedec2 function for multi-resolution analysis. For example, to perform a wavelet decomposition, you can use:

<code class="language-matlab">[coeffs, sizes] = wavedec2(image, level, 'waveletname');
</code>

Replace level with the desired decomposition level and 'waveletname' with the chosen wavelet type. You can then extract the approximation and detail coefficients from coeffs as needed.