基于SDI接口的实时图像增强显示系统

摘要

为了改善实时图像输出质量，研究基于SDI接口的增强显示系统软硬件设计。利用模块化思想提出一个基于SDI接口输出的硬件架构，以FPGA作为处理核心，通过2片SRAM的双缓存结构实现图像的乒乓控制，使输出图像满足SDI接口协议。在此提出了灰度拉伸、伪彩色处理以及画幅缩放3种实时图像增强算法。通过实验测试，系统工作稳定、实时性好，加入增强算法后图像对比度增强，极大增强了人眼的视觉效果。%To improve the real⁃time image output quality,the software and hardware design of the enhancement display sys⁃tem based on SDI interface was researched. A hardware architecture based on the SDI interface is proposed in this paper according to the modular thinking,in which FPGA is taken as the processing core,and the ping⁃pong control over images is implemented with dual⁃cache structure of two pieces of SRAMs to make output images meet the SDI interface protocol. In the paper,three re⁃al⁃time image enhancement algorithms such as gray stretch,pseudo⁃color processing and frame scaling are presented. The test⁃ing results show that the system works stable and its real⁃time performance is excellent. The image contrast was enhanced and the visual effects of the human eye was improved greatly after adding the enhancement algorithm.