From 0867b8167899b9df7a0b40bbc416abd359ac0ac8 Mon Sep 17 00:00:00 2001 From: Yaowu Xu Date: Mon, 1 Nov 2010 14:04:01 -0700 Subject: [PATCH] remove low pass filtering from two 4x4 intra prediction In the process of developing new intra prediction modes, tests have shown removal of the low pass filtering from B_HE_PRED and B_VE_PRED has an overall minor positive impact in both PSNR and SSIM metric. Overall difference is about 0.1%. The change shall also have a small positive impact on speed. Intuitively, this change should also reduce some of the tendency of "flattening" Change-Id: I3c43b0daca833c6eff77d00f19c811f9ef9368a3 --- vp8/common/reconintra4x4.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/vp8/common/reconintra4x4.c b/vp8/common/reconintra4x4.c index db44fa190..d3d133836 100644 --- a/vp8/common/reconintra4x4.c +++ b/vp8/common/reconintra4x4.c @@ -81,10 +81,10 @@ void vp8_predict_intra4x4(BLOCKD *x, { unsigned int ap[4]; - ap[0] = (top_left + 2 * Above[0] + Above[1] + 2) >> 2; - ap[1] = (Above[0] + 2 * Above[1] + Above[2] + 2) >> 2; - ap[2] = (Above[1] + 2 * Above[2] + Above[3] + 2) >> 2; - ap[3] = (Above[2] + 2 * Above[3] + Above[4] + 2) >> 2; + ap[0] = Above[0]; + ap[1] = Above[1]; + ap[2] = Above[2]; + ap[3] = Above[3]; for (r = 0; r < 4; r++) { @@ -105,10 +105,10 @@ void vp8_predict_intra4x4(BLOCKD *x, { unsigned int lp[4]; - lp[0] = (top_left + 2 * Left[0] + Left[1] + 2) >> 2; - lp[1] = (Left[0] + 2 * Left[1] + Left[2] + 2) >> 2; - lp[2] = (Left[1] + 2 * Left[2] + Left[3] + 2) >> 2; - lp[3] = (Left[2] + 2 * Left[3] + Left[3] + 2) >> 2; + lp[0] = Left[0]; + lp[1] = Left[1]; + lp[2] = Left[2]; + lp[3] = Left[3]; for (r = 0; r < 4; r++) { -- 2.40.0