【作者】 李宝魁；

【导师】 姚素英；

【作者基本信息】 天津大学 ， 微电子学与固体电子学， 2006， 硕士

【摘要】 视频格式转换芯片,是数字电视和数字处理电视的核心芯片之一,具有巨大的市场价值。它的主要功能是通过数字信号处理的方法把众多格式的输入信号转换成特定格式的输出信号。主要处理过程包含去隔行、帧频提升、分辨率提升,及各种画质增强。由于视频信号格式的多样性、处理算法的复杂性以及观众对画质的苛刻要求,视频格式转换芯片的研发面临着两方面技术难题:第一,开发兼顾主观效果和硬件开销的优秀视频格式转换算法;第二,设计高性能的VLSI实现方案。在总结和学习现有技术的基础上,本文从视频格式转换算法研究入手,着重论述了核心算法模块的VLSI实现方案和芯片总体架构的设计方案,并分析了相应的仿真验证结果。主要贡献在于以下几方面:第一,归纳总结了现有的视频格式转换算法,并在此基础上提出了一种运动自适应去隔行算法。第二,针对运动自适应去隔行算法的特点,提出了基于运动量存储的数据调度方案和折叠复用式缓存结构,大幅降低了硬件开销、减轻了系统的运算负担。第三,针对芯片设计难点,提出了两种总体控制策略及相应的芯片架构设计方案,并从鲁棒性、可扩展性和实时处理视频信号的能力等角度,分析对比两种方案的优劣,最终得出结论。更多还原

【Abstract】 As one of the most important chips in DTV and DPTV, video format conversion chip has a huge commercial value. Its main function is converting different input video formats into a given one through digital signal processing flow. It comprises de-interlacing, frame rate up-conversion, scaling and many image enhancement processes.Due to the diversity of input video formats, the complexity of processing algorithms and viewers’high requirements on image effect, it is necessary to overcome two difficulties to implement the chip: one is developing excellent video format conversion algorithms, which perfectly balance image effect and hardware expense; the other is designing high performance VLSI solutions.After investigating existing technologies, the author starts with developing video format conversion algorithms, expatiates on the VLSI implementation of key-algorithm blocks and the top-level system design of the chip, then analyzes the simulation results. Main contributions of the dissertation are shown below.First, sum up existing video format conversion algorithms; bring forward a motion-adaptive de-interlacing algorithm.Second, due to the operation characteristics of the de-interlacing algorithm, a motion-value stored data transfer strategy and zigzag FIFO structure are proposed to reduce hardware expense and alleviate computational burden.Third, to deal with difficulties in designing the chip, the author brings forward two top-level control strategies and related top-level system solutions for the chip, compares them in several aspects, such as robustness, extensibility and real-time processing ability, then draws a conclusion.更多还原