基于FPGA的视频图像降噪程序设计

毕业设计说明书（论文）中文摘要本文针对视频图像信息在产生、传输和记录的过程中经常会受到各种噪声的干扰的问题，设计了一种基于 FPGA的视频图像降噪处理器。本文主要介绍了视频图像降噪领域中时域递归滤波算法的相关理论，得出递归滤波的本质就是加权平均的低通滤波器。并根据滤波系数与信噪比改善和拖影之间的关系曲线，设计出基于 FPGA平台的自适应降噪处理器，包括判决、运算、存储三大模块，并给出了相应的用VHDL 描述的算法程序和控制程序，取得了预期的试验效果。自适应降噪处理器选用 Altera 公司 Cyclone 系列的 FPGA 作为核心芯片，具体型号为 EP1C20F400I7。整个设计都在 Altera公司的开发环境 Quartus II 7.0上进行逻辑综合以及仿真。6575
关键词 FPGA VHDL 图像降噪处理   时域递归滤波自适应递归降噪
毕业设计说明书（论文）外文摘要
Title Noise Reduction Program of Video Image Based On FPGA
Abstract
According to the video image information is often affected by various noise
in the process of production, transmission and recording, this paper
introduces one design of noise reduction processor in video image based
on FPGA.
This paper mainly introduces the algorithm of noise reduction in time
domain recursive filtering in the video image field, carries out the
recursive filter is the weighted average of the low pass filter. According
to the curve between filter coefficient and improved SNR, this paper
designs out an self-adaptive noise reduction processor based on the FPGA
platform, including three parts named judgment, operation, and SRAM
control. It also shows out the corresponding program written by VHDL and
achieves the desire result. Adaptive noise reduction processor selects
Altera Cyclone series FPGA as the core chip, with specific models for
EP1C20F400I7.
The whole design is simulated and synthesized on the Altera Quartus II 7.0
software.
Keywords    FPGA VHDL Image Noise Reduction Time domain recursive
filter self-adaptive noise reduction filter
目   录

1 引言   1
1．1 研究背景 .. 1
1．2 视频降噪的研究意义    1
1．3 视频降噪算法的国内外研究现状 .. 2
2 视频图像概述   4
2．1 视频信号数字化    4
2．2 数字视频图像 .. 5
2．3 数字视频格式 ITU-RBT.656标准 .. 6
3 FPGA 概述    9
3．1 FPGA结构 . 9
3．2 FPGA开发流程   10
3．3 FPGA的选型 .. 12
3．4 FPGA的开发调试工具 .. 13
4 时域递归滤波算法 ... 14
4．1 递归滤波原理 . 14
4．2 时域递归滤波系数的选择 ... 16
5 自适应降噪处理器设计 ... 18
5．1 延时模块 . 19
5．2 图像降噪处理模块 . 21
5.2.1 判断模块   21
5.2.2 运算模块   23
5.2.3 对比度增强模块 .. 25
5．3 SRAM控制模块   25
5.3.1 SRAM 使能与读写控制模块 .. 26
5.3.2 数据流向控制模块   30
6 仿真及调试 . 30
结论   33
致谢   34
参考文献 ... 35
1 引言
本章主要介绍视频图像降噪技术的研究背景、研究意义和国内外发展现状。基于FPGA的视频图像降噪程序设计:http://www.youerw.com/jisuanji/lunwen_4175.html