opencv编程简介笔记6六、视频处理下载_Word模板_4

opencv编程简介笔记6六、视频处理 Áù??ÊÓÆµ??Àí [?à?,] 1???ÓÊÓÆµÁ?ÖÐ??×?Ò?Ö??,Ãæ [?à?,] ??1?? OpenCV Ö??Ö?ÓÉãÏñÍ??òÊÓÆµÎÄ?þ??AVI?ñÊ???ÖÐ??×?Ö??,Ãæ. [?à?,] ??2?? ?õÊ???Ò??öÉãÏñÍ???×?Æ?: CvCapture* capture = cvCaptureFromCAM(0); // capture from video device #0 [?à?,] ??3?? ?õÊ???Ò??öÊÓÆµÎÄ?þ??×?Æ?: CvCapture* capture = cvCaptureFromAVI("infile.avi"); [?à?,] ??4?? ??×?Ò?Ö??,Ãæ: IplImage* img = 0; if(!cvGrabFrame(capture)){ // capture a frame printf("Could not grab a frame\n\7"); exit(0); } img=cvRetrieveFrame(capture); // retrieve the captured frame ÈôÒª?Ó?à?öÉãÏñÍ?ÖÐÍ?????×??,Ãæ??ÔòÐëÊ×ÏÈ?ÓÃ??öÉãÏñÍ?ÖÐ×?È?Ò?Ö????ô?Ó×ÅÒª??????×?µÄÖ??,Ãæ?Ö??µ?Ò??öIplImage*ÐÍÍ?ÏñÖÐ????Òë×??ºÕâÒ??ý?ÌÆäÊµ?ÉÒÔÓÃ cvQueryFrame() º?ÊýÒ???Íê?É?? [?à?,] ??5?? ÊÍ?ÅÊÓÆµÁ???×?Æ?: cvReleaseCapture(&capture); ×?ÒâÓÉÊÓÆµÁ???×?Æ?µÃµ?µÄÍ?ÏñÊÇÓÉ??×?Æ??ÖÅäºÍÊÍ?ÅÄÚ?æµÄ????ÐèÒªµ??À?ÔÍ?Ïñ?øÐÐÊÍ?ÅÄÚ?æµÄ?Ù×??? [?à?,] 2???ñÈ?/ÉèÖÃÊÓÆµÁ?ÐÅÏ? [?à?,] ??1?? ?ñÈ?ÊÓÆµÁ?Éè??ÐÅÏ?: cvQueryFrame(capture); // ÔÚ?ÁÈ?ÊÓÆµÁ?ÐÅÏ?Ç???ÒªÏÈÖ?ÐÐ?Ë?Ù×? int frameH = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT); int frameW = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH); int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS); int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT); Í??Æ×ÜÖ?Êý?ö?ÔÊÓÆµÎÄ?þÓÐÐ???µ?ËÆºõ??Ì?×?È???Òë×??ºÒ?ÐíOpenCV2.0ÖÐ?ËÎÊÌâÒÑ?â?ö?? [?à?,] ??2?? ?ñÈ?Ö?Í?ÐÅÏ?: float posMsec = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_MSEC); int posFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_POS_FRAMES); float posRatio = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_AVI_RATIO); Ëù×?È?µÄÖ?µÄÎ?ÖÃÓÐÈýÖÖ?í?ï??Ê??º?àÀëµÚÒ?Ö??,ÃæµÄÊ??ä?ä?ô??ºÁÃëÎªµ?Î???, ?òÕß?àÀëµÚÒ?Ö??,Ãæ??ÐòÁÐºÅÎª0??µÄÐòÁÐÊý. µÚÈýÖÖ??Ê?ÊÇ??Ïà?Ô?ÈÂÊ??µÚÒ?Ö?µÄÏà?Ô?ÈÂÊÎª0??×îºóÒ?Ö?µÄÏà?Ô?ÈÂÊÎª1. ?Ë??Ê??ö?Ô?ÁÈ?ÊÓÆµÎÄ?þÊ?ÓÐÐ?. [?à?,] ??3?? ÉèÖÃ?ÓÊÓÆµÎÄ?þ×?È?µÄµÚÒ?Ö??,ÃæµÄÎ?ÖÃ: // start capturing from a relative position of 0.9 of a video file cvSetCaptureProperty(capture, CV_CAP_PROP_POS_AVI_RATIO, (double)0.9); ×?Òâ?Ë??????Î?????×?È??? [?à?,] 3?????æÊÓÆµÎÄ?þ [?à?,] ??1?? ?õÊ???ÊÓÆµ?àÐ?Æ?: CvVideoWriter *writer = 0; int isColor = 1; int fps = 25; // or 30 int frameW = 640; // 744 for firewire cameras int frameH = 480; // 480 for firewire cameras writer=cvCreateVideoWriter("out.avi",CV_FOURCC('P','I','M','1'), fps,cvSize(frameW,frameH),isColor); ÆäËüµÄ?àÂëÆ??úºÅ?üÀ?: CV_FOURCC('P','I','M','1') = MPEG-1 codec CV_FOURCC('M','J','P','G') = motion-jpeg codec (does not work well) CV_FOURCC('M', 'P', '4', '2') = MPEG-4.2 codec CV_FOURCC('D', 'I', 'V', '3') = MPEG-4.3 codec CV_FOURCC('D', 'I', 'V', 'X') = MPEG-4 codec CV_FOURCC('U', '2', '6', '3') = H263 codec CV_FOURCC('I', '2', '6', '3') = H263I codec CV_FOURCC('F', 'L', 'V', '1') = FLV1 codec Èô?àÂëÆ??úºÅÎª -1??ÔòÔËÐÐÊ??áµ??öÒ??ö?àÂëÆ?Ñ?Ôñ?ò. [?à?,] ??2?? ???ÖÊÓÆµÎÄ?þ: IplImage* img = 0; int nFrames = 50; for(i=0;i

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opencv编程简介笔记6六、视频处理

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