%?2017-05-22?by?LSS
%?Live?Face?Detection
%?Need?to?manually?install?support?package?（OS?Generic?Video?Interface）
vidDevice?=?imaq.VideoDevice（‘winvideo‘?1?‘MJPG_320x240‘?...
?????????????????????????????‘ROI‘?[1?1?320?240]?...
?????????????????????????????‘ReturnedColorSpace‘?‘rgb‘?...
?????????????????????????????‘DeviceProperties.Brightness‘?8?...
?????????????????????????????‘DeviceProperties.Sharpness‘?8）;
hVideoIn?=?vision.VideoPlayer;
hVideoIn.Name??=?‘Input?Video‘;
hVideoOut?=?vision.VideoPlayer;
hVideoOut.Name??=?‘Output?Video‘;
faceDetector?=?vision.CascadeobjectDetector（）;
pointTracker?=?vision.PointTracker（‘MaxBidirectionalError‘?2）;
numPts?=?0;

while?1
????videoframe?=?step（vidDevice）;
????videoframeOutput?=?videoframe;
????videoframeGray?=?rgb2gray（videoframe）;
????if?numPts?????????%?Detection?mode.
????????bbox?=?faceDetector.step（videoframeGray）;
????????if?~isempty（bbox）
????????????%?Find?corner?points?inside?the?detected?region.
????????????points?=?detectMinEigenFeatures（videoframeGray?‘ROI‘?bbox（1?:））;
????????????%?Re-initialize?the?point?tracker.
????????????xyPoints?=?points.Location;
????????????numPts?=?size（xyPoints1）;
????????????release（pointTracker）;
????????????initialize（pointTracker?xyPoints?videoframeGray）;
????????????%?Save?a?copy?of?the?points.
????????????oldPoints?=?xyPoints;
????????????%?Convert?the?rectangle?represented?as?[x?y?w?h]?into?an
????????????%?M-by-2?matrix?of?[xy]?coordinates?of?the?four?corners.?This
????????????%?is?needed?to?be?able?to?transform?the?bounding?box?to?display
????????????%?the?orientation?of?the?face.
????????????bboxPoints?=?bbox2points（bbox（1?:））;
????????????%?Convert?the?box?corners?into?the?[x1?y1?x2?y2?x3?y3?x4?y4]
????????????%?format?required?by?insertShape.
????????????bboxPolygon?=?reshape（bboxPoints‘