todo.txt

基于C语言的小波处理

1. the floating DWT can't be used in subband, and the best coders are
	now subband only. This should be remedied.

2. Wavelet-Packet / Multi-trans / Subbands
	A. use different TransQuads on each node
	B. encode the subband tree!
	C. smart coders that can use sisters & parents of various sizers
	D. the "activity" should actually be the size output by the coder
	E. set parents right :
		first do the normal wavelet transform
		set parents as usual
		whenever you subdivide a child, the parents persist.
		when you subdivide a parent, the new LL becomes the new parent;
			the non-LLs get the LL as the same-size-parent

3. bit allocation for better quantizing
	A. see the "bitalloc" "qtest"
	B. classify coefficients by activity
		send different quatizers by activity
	C. Q/Z quantizer + deadzone-size quants
		(a quick approximation of optimal)