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发布时间:2016-11-02

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MB86S02视频图像传感器在FPGA的控制下进行视频图像信息的采集,在收到PC机的采集命令后MB86S02开始视频信号的采集FPGA作为系统的核心控制单元不仅负责视频图像的采集,而且负责视频图像信息的预处理和系统各单元模块之间的数据交互。针对视频图像数据量大的特点,为了保证系统的实时性要求,系统采用大容量的片外SDRAMR对采集到的视频图像信息进行缓存,SDRAM控制器由FPGA实现,视频图像信息经过SDRAM缓存后首先要由FPGA对其进行滤波处理,以消除图像信息中的噪声干扰,本系统中采用中值滤波的方式对采集到的视频信息进行处理,滤波后的数据通过FPGA内部FIFO进入DSP进行下一步的压缩处理。DSP上电后首行引导程序的自加载,等待FPGA发送请求,在收到FPGA的请求后,DSP建立EDMA通道从FPGA获取视频数据,存满一帧后,开始对视频图像进行JPEG压缩处理,压缩处理后的视频图像信息经过FIFO缓存后,在FPGA的控制下写入USB接口控制器的数据缓存区,等待PC机的读数请求,USB接口控制器在收到PC机的读数请求后将数据写入PDIUSBD12的端口1,以便PC机下一步读取数据。

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