说明：  视频采集是开发视频监控系统的首要步骤，它关系到采集视频数据的质量，因此，视频采集会影响到其后的各种操作（包括视频预览、视频录像、视频回放、图像识别等）
(Video capture is the development of video surveillance system the first step, it is related to the quality of data capture video, so the video capture will affect the subsequent various operations (including video preview, video recording, video playback, image recognition, etc.))