车载电子系统中的视频抓拍技术

目前对视频技术的研究与应用主要集中于利用图像处理与模式识别手段对视频图像进行处理，视频抓拍都是以抓拍时间点为起始时间点，所拍摄视频包含的信息缺乏完整性，进而会影响进一步的分析与处理.针对此问题，通过定义时间窗口并利用缓存技术，提出了一种基于Android系统的视频抓拍方案的设计与实现，其关键在于能够提供抓拍时间点之前到之后一定时间段内的视频.测试结果表明，该方案具有较小的时间误差，并占用较少的系统资源，已被应用于量产并投入市场的车载电子系统中，为交通事故责任认定提供了重要依据.

Video Capture Technology in Vehicle Electronic System

At present, the research and application of video technology mainly focus on the processing of video images by image processing and pattern recognition. The video capture is started from the capture time point, thus the information contained in the captured video lacks integrity, that affects further analysis and processing. Aiming at this problem, design and implementation of a video capture scheme are proposed based on Android system by defining the time window and using the cache technology. The key is to provide video for a certain period of time from before to after the capture time point. The test results show that the capture scheme has a small time error and occupies less system resources, and has been applied to vehicle electronic systems which are mass-produced and put into the market, providing an important basis for traffic accident liability identification.