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In the previous class, we discussed how to use the discrete wavelet transform (DWT) in images and planned to address the encoding of DWT coefficients to generate a bit stream. Due to time constraints, we could not cover everything, so this lecture will continue the topic. The focus is on embedded zerotree wavelet encoding. Towards the end of the last lecture, we introduced the parent-child relationship among coefficients in different subbands; specifically, transitioning from a coarser resolution to a finer one results in one coefficient at the coarser level corresponding to four coefficients at the finer level, forming a tree structure where the root represents the coarser coefficient.
