[theora] NHW Image codec - improvement of precision

[Raphael Canut]

Hi again,

I have improved precision of my codec (on the encoder and decoder).I have
also improved the -h1 quality setting.-Source code and binaries at
http://nhwcodec.blogspot.com/-.

I am still trying to improve precision of my codec, with keeping my
low-complexity (fast) approach.
I do not totally use the reference (and impressive) block prediction with
different modes + residual coding scheme, but I just apply residual coding
on the first order wavelet "image" (for example for a 512x512 image, I just
code the errors on the 256x256 wavelet "high-resolution" part), hence the
lack of precision.I try to compensate it with a little more neatness of the
wavelet 5/3 filterbank, but that's right that precision seems visually more
important.

Any opinion on this approach or on the codec in general is very welcome.

Many thanks again,
Raphael
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