#include?“cv.h“
#include?“highgui.h“
#include?
#include?
#include?
#include?

//?various?tracking?parameters?（in?seconds）
const?double?MHI_DURATION?=?0.5;
const?double?MAX_TIME_DELTA?=?0.5;
const?double?MIN_TIME_DELTA?=?0.05;
//?用于運動檢測的循環幀數，與機器速度以及FPS設置有關
const?int?N?=?2;

//?ring?image?buffer
IplImage?**buf?=?0;
int?last?=?0;

//?temporary?images
IplImage?*mhi?=?0;?//?MHI:?motion?history?image
IplImage?*orient?=?0;?//?orientation
IplImage?*mask?=?0;?//?valid?orientation?mask
IplImage?*segmask?=?0;?//?motion?segmentation?map
CvMemStorage*?storage?=?0;?//?temporary?storage

//?parameters:
//??img?-?input?video?frame
//??dst?-?resultant?motion?picture
//??args?-?optional?parameters
void??update_mhi（?IplImage*?img?IplImage*?dst?int?diff_threshold?）
{
????double?timestamp?=?clock（）/1000.;?//?get?current?time?in?seconds
????CvSize?size?=?cvSize（img->widthimg->height）;?//?get?current?frame?size
????int?i?idx1?=?last?idx2;
????IplImage*?silh;
????CvSeq*?seq;
????CvRect?comp_rect;
????double?count;
????double?angle;
????CvPoint?center;
????double?magnitude;??????????
????CvScalar?color;

????//?allocate?images?at?the?beginning?or
????//?reallocate?them?if?the?frame?size?is?changed
????if（?!mhi?||?mhi->width?!=?size.width?||?mhi->height?!=?size.height?）?
????{
????????if（?buf?==?0?）?
????????{
????????????buf?=?（IplImage**）malloc（N*sizeof（buf[0]））;
????????????memset（?buf?0?N*sizeof（buf[0]））;
????????}
????????
????????for（?i?=?0;?i?????????{
????????????cvReleaseImage（?&buf[i]?）;
????????????buf[i]?=?cvCreateImage（?size?IPL_DEPTH_8U?1?）;
????????????cvZero（?buf[i]?）;
????????}
????????cvReleaseImage（?&mhi?）;
????????cvReleaseImage（?&orient?）;
????????cvReleaseImage（?&segmask?）;
????????cvReleaseImage（?&mask?）;
????????
????????mhi?=?cvCreateImage（?size?IPL_DEPTH_32F?1?）;
????????cvZero（?mhi?）;?//?clear?MHI?at?the?beginning
????????orient?=?cvCreateImage（?size?IPL_DEPTH_32F?1?）;
????????segmask?=?cvCreateImage（?size?IPL_DEPTH_32F?1?）;
????????mask?=?cvCreateImage（?size?IPL_DEPTH_8U?1?）;
????}

????cvCvtColor（?img?buf[last]?CV_BGR2GRAY?）;?//?convert?frame?to?grayscale

????idx2?=?（last?+?1）?%?N;?//?index?of?（last?-?（N-1））th?frame
????last?=?idx2;

????silh?=?buf[idx2];
????//?相鄰兩幀的差
????cvAbsDiff（?buf[idx1]?buf[idx2]?silh?）;?//?get?difference?between?frames
????
????//?對差圖像做二值化
????cvThreshold（?silh?silh?diff_threshold?1?CV_THRESH_BINARY?）;?//?and?threshold?it
????cvUpdateMotionHistory（?silh?mhi?timestamp?MHI_DURATION?）;?//?update?MHI

????//?convert?MHI?to?blue?8u?image
????//?cvCvtScale的第四個參數?shift?=?（MHI_DURATION?-?timestamp）*255./MHI_DURATION
????//?控制幀差的消失速率
cvCvtScale（?mhi?mask?255./MHI_DURATION
?（MHI_DURATION?-?timestamp）*255./MHI_DURATION?）;

????cvZero（?dst?）;
????cvCvtPlaneToPix（mask?0?0?0?dst?）;??//?BGR0?－>?dist?:?convert?to?BLUE?image

????//?計算運動的梯度方向以及正確的方向掩模mask
????//?Filter?size?=?3
cvCalcMotionGradient（?mhi?mask?orient?
MAX_TIME_DELTA?MIN_TIME_DELTA?3

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3768??2010-05-12?10:24??例5-21\Debug\BuildLog.htm

?????文件?????204855??2010-05-08?19:34??例5-21\Debug\motempl.exe

?????文件???????2048??2010-05-12?10:18??例5-21\Debug\motempl.exe.embed.manifest

?????文件?????238404??2010-05-08?19:34??例5-21\Debug\motempl.ilk

?????文件??????41984??2010-05-08?19:34??例5-21\Debug\vc60.idb

?????文件??????77824??2010-05-08?19:34??例5-21\Debug\vc60.pdb

?????文件??????19456??2010-05-12?10:24??例5-21\Debug\vc80.idb

?????文件??????36864??2010-05-12?10:24??例5-21\Debug\vc80.pdb

?????文件????????135??2007-02-24?15:18??例5-21\Makefile

?????文件???????6613??2007-02-24?15:17??例5-21\motempl.c

?????文件???????4160??2007-03-07?20:41??例5-21\motempl.dsp

?????文件????????539??2007-03-07?20:41??例5-21\motempl.dsw

?????文件?????134144??2010-05-12?10:26??例5-21\motempl.ncb

?????文件??????53760??2010-05-08?19:35??例5-21\motempl.opt

?????文件???????1173??2010-05-08?19:34??例5-21\motempl.plg

?????文件????????878??2010-05-12?10:18??例5-21\motempl.sln

????..A..H.??????7168??2010-05-12?10:18??例5-21\motempl.suo

?????文件???????5318??2010-05-12?10:18??例5-21\motempl.vcproj

?????文件???????1427??2010-05-12?10:18??例5-21\motempl.vcproj.WWW-7F00BFE87CD.Administrator.user

?????文件?????432700??2007-02-24?15:18??例5-21\video.avi

?????目錄??????????0??2010-05-12?10:24??例5-21\Debug

?????目錄??????????0??2010-05-12?10:18??例5-21

-----------?---------??----------?-----??----

??????????????1273218????????????????????22