基于blackfin DSP视频字符叠加的实现
论文首先介绍了视频字符叠加器的实现方案，然后给出了系统的总体框图，讨论了ADV7183视频解码和ADV7179视频编码、DSP视频处理、SDRAM数据存储、字符叠加四个模块的设计与实现。接着，论述了DSP的软件设计与开发，包括DSP对ADV7183和ADV7179的初始化、对SDRAM的读取以及输出字符叠加信号。最后讨论了系统的各个模块的调试，先实现了输入和输出，然后实现了字符叠加，表明了本系统是可行的。10395
关键词 ADSP 字符叠加 ADV7183 ADV7179
毕业设计说明书（论文）外文摘要
Title The Implement of the Video Character Superimposer Based on BF561
Abstract
The video character superimposer is now widely used in many fields, such as the pane to mask the moving object in the moving object detection system, as well as the character to show time, date and other information in the stakeout system. This dissertation discusses and implements the video character superimposer based on the chip BF561.
First of all, the project of the video character superimposer is introduced. Then the systematic scheme is put forward. The dissertation discusses the design and implementation of the following four modules: the video ADV7183 decoding and ADV7179 coding, the DSP video processing, the SDRAM date storage and the character superimposing. After that, the software design and exploiture are dissertated, including initializing the ADV7183 and ADV7179 by DSP, reading SDRAM and sending out the superimposed signal by DSP. Finally, this dissertation discusses the debugging of each systematic module, and implements the character superimposer. The debugging shows that the system is feasible and effective.
Keywords ADSP Character Superimpose ADV7183 ADV7179
目 次 I
1 绪论 1
1．1 研究背景及意义 1
1．2 研究内容及方法 2
1．3 论文的结构安排 3
2 视频字符叠加系统方案设计 3
2．1 引言 3
2．2 视频字符叠加系统实现功能和技术指标 4
2．3 视频字符叠加系统组成 4
2．4 本章小结 5
3 基于ADSP的视频字符叠加器的硬件系统构成 5
3．1 引言 5
3．2 视频解码和编码模块 6
3．3 基于ADSP-BF561的视频处理模块 10
3．4 数据存储模块 12
3.4.1 FLASH模块设计 14
3.4.2 SDRAM模块设计 14
3．5 本章小结 15
4 基于ADSP的视频字符叠加器的软件设计 16
4．1 引言 16
4．2 软件开发流程 17
4．3 视频输入输出模块程序 18
4．3．1 对ADV7183寄存器的配置 19
4．3．2 I2C总线配置ADV7179寄存器 20
4．3．3 PPI接口模块设置 23
4．3．4 DSP与SDRAM的通信程序 27