本章节主要介绍一些视频格式相关的基础知识. 交织(Interlace) 即每一个采样帧采样时隔行采样,奇数行和偶数行交替. YCbCr 人眼视觉系统(Human Visual System, HVS)对亮度的敏感度高于对色彩的敏感度.因此诞生了YCbCr颜色空间,其中Y代表亮度,CbCr则是两个颜色分量. RGB与YCbCr之间可以相互转化,公式位于书中16-17页,(2.3)至(2.6). YCbCr采样格式 常见的有4:4:4,4:2:2,4:2:0,数字一定程度上反映了三个颜色通道采样的权…

本章主要介绍一些有关视频编码的概念 时域模型(Temporal Model) 时域模型的作用是去除帧间冗余.如:将第二帧减去第一帧,得到的剩余信息,其能量会远小于第二帧本身. 基于块的运动估计和补偿 运动估计:针对于当前帧的M*N大小的块,在参考帧中寻找与它最相近的块(找相减后剩余能量最小的). 运动补偿:当前帧的块减去参考帧中匹配的块,得到一个剩余块. 运动向量:上述两个块之间的位移. 宏块(Macroblock) 在多数视频编码标准中(MPEG-1,MPEG-2,MPEG-4 Visual,…

转自:https://www.linuxtv.org/downloads/legacy/video4linux/API/V4L2_API/spec-single/v4l2.html Video for Linux Two API Specification Revision 2.6.32 Michael H Schimek <mschimek@gmx.at> Bill Dirks Original author of the V4L2 API and documentation. Hans V…

转自:http://blog.csdn.net/jmq_0000/article/details/7536805#t136 Video for Linux Two API Specification Revision 0.24 Michael H Schimek <mschimek@gmx.at> Bill Dirks Hans Verkuil Martin Rubli Copyright © 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 20…

Creating an animated GIF picture from photos or video with Adobe Photoshop is easy, but not everyone owns a copy of Photoshop, in fact, using a free utility to make a GIF is more easy and efficient. To convert a video to GIF format with an online ser…

之前对着几种视频格式认识不是很清晰,所以看数据手册的时候,看的也是稀里糊涂的. 因为项目中需要用到cvbs做视频输入,在元器件选型上,看到tw2867的数据手册上,有这么一句话: The TW2867 includes four high quality NTSC/ PAL/SECAM video decoders that convert analog composite video signal to digital component YCbC r data for security ap…

BACKGROUND The present invention relates to video processing systems. Advances in imaging technology have led to high resolution cameras for personal use as well as professional use. Personal uses include digital cameras and camcorders that can captu…

To process specialized file formats (such as video) in Hadoop, you'd have to write a custom InputFormat and RecordReader that understands how to turn a video file into splits (the InputFormat) and then read splits into values (the RecordReader).在Hado…

LAV Video 是使用很广泛的DirectShow Filter.它封装了FFMPEG中的libavcodec,支持十分广泛的视频格式的解码.在这里对其源代码进行详细的分析. LAV Video 工程代码的结构如下图所示 直接看LAV Video最主要的类CLAVVideo吧,它的定义位于LAVVideo.h中. LAVVideo.h /* 雷霄骅 * 中国传媒大学/数字电视技术 * leixiaohua1020@126.com * */ /* * Copyright (C) 2010-20…

看图写代码 阅读<<Audio/Video Connectivity Solutions for Virtex-II Pro and Virtex-4 FPGAs >> 1.SDI Block Diagram and SD-SDI Section Chapters 2.XYZ Word Format for the 4:4:4:4 TRS Symbol 端口定义: module trs_detect ( // inputs clk, // clock input ce, // cl…