tree a4ca48f7a4158b65ecc7963da722760017e6019f
parent f1a3b1e0d94dec2d40008f36fdfad99338484b9a
author Yaowu Xu <yaowu@google.com> 1277787823 -0700
committer Yaowu Xu <yaowu@google.com> 1277788248 -0700

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