A Video Transcoder Scheme Based on H.264

LIU Zhao-guang; PENG Yu-hua; YANG Yang

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A Video Transcoder Scheme Based on H.264

更新时间：2025-07-16

- A Video Transcoder Scheme Based on H.264
- Acta Electronica Sinica Vol. 36, Issue 5, Pages: 848-851(2008)
- 作者机构：
  
  山东大学信息科学与工程学院,山东,济南,250100
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP391.41
- Published：2008
- 稿件说明：
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LIU Zhao-guang, PENG Yu-hua, YANG Yang. A Video Transcoder Scheme Based on H.264[J]. Acta Electronica Sinica, 2008, 36(5): 848-851.
DOI：

LIU Zhao-guang, PENG Yu-hua, YANG Yang. A Video Transcoder Scheme Based on H.264[J]. Acta Electronica Sinica, 2008, 36(5): 848-851. DOI：

摘要

本文提出了一种基于H.264降低图像尺寸转码中的宏块类型快速选择方案.文中以原始图像中对应四个宏块的非零系数总个数为准则选择宏块类型

首次提出以指数模型来描述阈值和重新量化参数的关系(

Th-Q

模型)

并将其线性化为一元线性回归模型

进一步使用最小二乘法来估计模型中的参数.帧内模式选择中

Th-Q

模型是用来区分I4×4和I16×16宏块;帧间模式选择中

Th-Q

模型区分出当前宏块所处区域的运动性质

进而简化候选宏块类型个数.实验结果表明

与全搜索法相比

在保证压缩性能损失不大的情况下

本文提出的帧内模式选择方法的速度能提高4到5倍

帧间模式选择方法的速度能提高约35倍.

Abstract

A fast macroblock mode selection method in downscaling transcoder based on H.264 is proposed in this paper

which the total non-zero coefficients of responding four macroblocks in pre-coded frame is utilized as the criterion to select macroblock mode.We propose an exponent function model between threshold and re-quantization parameter (

Th-Q

model).This model is converted into a linear regression model

and least square method is adopted to estimate parameters in the model.In the intra mode selection part

Th-Q

model is used to classify I4×4 or I16×16;In the inter mode selection part

Th-Q

model is used to classify the motion activity in downscaled frame

and different candidate macroblock modes are used according to classi

fied motion activity areas.We compared the PSNR performance and computational complexity of proposed method with the full search algorithm.For the intra mode selection part

we can speed up about 4~5 times

and for the inter mode selection part

we can speed up about 35 times.

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