一种DSP折反射全景图像实时展开方法  

Real-time unrolling catadioptric omni-directional images on DSP

作　　者：程钢[1] 熊志辉[1] 陈立栋[1] 王斌[1] 张茂军[1] 

机构地区：[1]国防科学技术大学信息系统与管理学院,长沙410073

出　　处：《计算机应用》2008年第9期2285-2287,2291,共4页journal of Computer Applications

基　　金：国家自然科学基金资助项目(60705013)

摘　　要：为了提高折反射全景图像展开速度,可采用查表来取代耗时的计算,但查找表需要大量的存储空间,于是采用分块预取方法。通过分块,将待处理目标图像块对应的查找表和原始图像分块预先存入DSP片内存储器并完成展开,可以降低存取访问开销,加快查表展开。实验结果表明,分块预取方法在对1 024×768分辨率的原始全景图像展开为1 152×256分辨率的目标全景图像时,展开数据可达每秒97帧,与不采用分块预取策略的查表展开方法相比,此方法要快近20倍。Lookup-table method is usually used to improve the speed of panorama unrolling to avoid time-consuming calculation, but it strongly requires space for storage. Therefore, a method called block prefetch was put forward. In order to lower the accessing cost and fastern the lookup-table unrolling, a target image can be divided with its corresponding lookup- table and source image into blocks, and then it can be unrolled in DSP＇s on-chip memory by the prefetched blocks. Experiments indicate that the method makes the unrolling achieve a level of 97 frames per second, when dealing with 1024 × 768 source image to 1 152 × 256 target image. It is 20 times faster than a lookup-table panorama unrolling without block prefetch.

关 键 词：折反射全景图像 全景图像查表展开 分块预取 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]