基于双DSP结构的实时视频压缩编码器

本文讨论了实时视频压缩编码器的设计与实现，提出了一种DSP加运动协处理器的系统结构，给出了用单象素精度运动估计器实现1／2精度运动估计的方法，并列出了系统可实现的性能指标。     

快速GaAs光控微波开关参量的研究

本文对ＧａＡｓ衬底边缘照射微带型线型光控微波开关进行了开关的结构参数设计，对开关的插入损耗和隔离度进行分析计算，并进一步讨论了频率响应及其光脉冲能量对开关隔离度的影响。     

基于IEKF视觉运动分析递归算法的研究

本文提出基于图象序列上特征点的图象平面轨迹进行运动参数估计，以提取运动物体的姿态、速度以及外部环境内所感兴趣点的位置参数，由于图象特征点轨迹与待估计的参数有关，因此能够组合长序列图象内的信息并利用ＩＥＫＦ递归地估计未知的运动及结构参数。     

Computer Vision Method in Human Motion Detection

Human motion detection based on computer vision is a frontier research topic and is causing an increasing attention in the field of computer vision research. The wavelet transform is used to sharpen the ambiguous edges in human motion image. The shadow＇s effect to the image processing is also removed. The edge extraction can be successfully realized. This is an effective method for the research of human motion analysis system.     

基于C语言的Motion JPEG2000文件的构造

通过寻找标识从数据文件中提取JPEG2000编码流,从而构造视频播放程序能识别的标准的MotionJPEG2000文件.其程序设计首先判断一帧完整的ADV202输出流,然后将JPEG2000编码流从ADV202输出流中提取出来,最后将提取出来的JPEG2000编码流写入到事先保存好的文件头之后并与文件尾合并.     

Remarks on the differential method for the estimation of movement in television images

In this paper a physical interpretation is given of a method for the estimation of movements in television images. The method, already presented by the author in other papers, is based on a linear regression of the image derivatives, both spatial and temporal. It is shown that a centered finite differences approximation of the image differentials is mandatory to obtain good performances. Experimental results are issued to support theoretical conclusions.     

加入运动触发场景的非均匀性校正方法

针对目前非均匀性校正方法存在的问题与不足,介绍了适于红外焦平面阵列探测器的非均匀性校正处理方法。其特点是用一个触发电路使基于场景的非均匀性校正电路对探测器的运动信号做出响应。实验结果表明,在没有劣化静态场景的情况下,该方法实现了运动场景信号的校正,不仅消除了红外焦平面阵列响应的非均匀性,而且补偿了其漂移。     

一种基于生物地理优化的快速运动估计算法

为了提高视频编码中运动估计的性能,该文提出了一种新的基于生物地理优化的快速运动估计算法。该算法以运动矢量的特性为基础,通过生物地理优化算法的迁徙和变异操作搜索全局最优解,克服了以往快速搜索算法容易陷入局部最优的缺点,同时采用了早期和迭代终止策略,进一步简化运算复杂度。实验表明,该算法的整体性能高于以往快速搜索算法,可以有效兼顾搜索精度和速度的要求。由于实现简单和适用面广,该算法能满足实时视频编码的需求。     

Fast motion estimation for H.264

Several specific features have been incorporated into Motion estimation (ME) in H.264 coding standard to improve its coding efficiency. However, they result in very high computational load. In this paper, a fast ME algorithm is proposed to reduce the computational complexity. First, a mode discriminant method is used to free the encoder from checking the small block size modes in homogeneous regions. Second, a condensed hierarchical block matching method and a spatial neighbor searching scheme are employed to find the best full-pixel motion vector. Finally, direction-based selection rule is utilized to reduce the searching range in sub-pixel ME process. Experimental results on commonly used QCIF and CIF format test sequences have shown that the proposed algorithm achieves a reduction of 88% ME process time on average, while incurring only 0.033 dB loss in PSNR and 0.50% increment on the total bit rate compared with that of exhaustive ME process, which is a default approach adopted in the JM reference software.     

基于IMU数据与双星定位系统组合的机载SAR运动补偿

该文主要介绍了机载SAR平台运动误差中惯性测量单元(IMU)系统误差的补偿方法。由于双星定位系统误差不随时间递增,该文利用双星定位系统(GEOSTAR)与IMU进行组合,消除随时间递增的IMU系统误差,提高IMU定位精度,从而减轻SAR成像处理器运动补偿的负担。