]> granicus.if.org Git - libvpx/commit
projects / libvpx / commit
? search:
summary | shortlog | log | commit | commitdiff | tree
(parent: f1a3b1e) | patch
Improve the accuracy of forward walsh-hadamard transform
authorYaowu Xu <yaowu@google.com>
Tue, 29 Jun 2010 05:03:43 +0000 (22:03 -0700)
committerYaowu Xu <yaowu@google.com>
Tue, 29 Jun 2010 05:10:48 +0000 (22:10 -0700)
commitb62d093efa8bc100462995ffd8d067fe1f49612c
treea4ca48f7a4158b65ecc7963da722760017e6019ftree | snapshot
parentf1a3b1e0d94dec2d40008f36fdfad99338484b9acommit | diff
Improve the accuracy of forward walsh-hadamard transform

Besides the slight improvement in round trip error. This
also fixes a sign bias in the forward transform, so the
round trip errors are evenly distributed between +1s and
-1s. The old bias seemed to work well with the dc sign bias
in old fdct,  which no longer exist in the improved fdct.

Change-Id: I8635e7be16c69e69a8669eca5438550d23089cef
vp8/encoder/dct.c diff | blob | history
vp8/encoder/x86/x86_csystemdependent.c diff | blob | history
Unnamed repository; edit this file 'description' to name the repository.