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List:       theora
Subject:    [theora] NHW Image codec - improvement of precision
From:       Raphael Canut <nhwcodec () gmail ! com>
Date:       2012-07-25 14:50:17
Message-ID: CAKE58qFhms-uBmeq=vKUUqHV1AdxYKooNFU3CRQ_BkgSpWgv8g () mail ! gmail ! com
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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

[Attachment #5 (text/html)]

<div>Hi again,</div><div> </div><div>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 <a href="http://nhwcodec.blogspot.com/">http://nhwcodec.blogspot.com/</a>-.</div>
 <div> </div><div>I am still trying to improve precision of my codec, with keeping my \
low-complexity (fast) approach.</div><div>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 &quot;image&quot; (for example \
for a 512x512 image, I just code the errors on the 256x256 wavelet \
&quot;high-resolution&quot; part), hence the lack of precision.I try to compensate it \
with a little more neatness of the wavelet 5/3 filterbank, but that&#39;s right that \
precision seems visually more important.</div> <div> </div><div>Any opinion on this \
approach or on the codec in general is very welcome.</div><div> </div><div>Many \
thanks again,</div><div>Raphael</div>



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