基于DSP平台的机载高清视频编码器设计与实现

针对无人机(UVA)航拍对高清视频的需求,设计并实现了基于数字信号处理器(DSP)平台的MPEG-4高清视频编码器,具有体积小、功耗低和可靠性高的特点.根据DSP片内资源设计了存储器分配方案,优化了编码过程中的数据流传输,降低了数据访问对编码速度的影响.针对视频编码算法中复杂度较高的部分,采用了基于预测的运动估计,减少...

Design and Implementation of Airborne High Definition Video Encoder Based on DSP Platform

To enhance the capacity of video capturing and ground reconnaissance of an unmanned aerial vehicle (UAV), an efficient MPEG-4 high definition video encoder is designed and implemented on a digital signal processor (DSP) platform, which is characterized by small volume, low power consumption and high reliability. Firstly, the data flow scheme of video encoding is optimized by allocating the on-chip memory of the DSP reasonably, which reduces the impact of data access on encoding speed. Secondly, prediction-based motion estimation is adopted to accelerate the search of matching blocks. Furthermore, optimized variable length coding and predicting all-zero coefficient blocks are proposed to improve coding speed and reduce discrete cosine transformation (DCT) and quantization computation respectively. Experimental results show that, for the video sequence with 720P (1 280 pixel×720 pixel resolution) format, the optimized encoder can achieve an encoding speed of over 20 frame/s, and the peak signal to noise ratio (PSNR) is higher than 35 dB, with satisfactory visual quality and relatively low bit rate.