%创建人脸检测对象。faceDetector = vision.CascadeObjectDetector ();创建点跟踪器对象。pointTracker =愿景。PointTracker (“MaxBidirectionalError”2);%创建网络摄像机对象。凸轮=摄像头();%捕获一帧以获取其大小。videoFrame =快照(cam);frameSize =大小(videoFrame);%创建视频播放器对象。放像机=愿景。放像机(“位置”， [100 100 [frameSize(2)， frameSize(1)]+30]);

runLoop = true;numPts = 0;frameCount = 0;而runLoop && frameCount < 400获得下一帧。videoFrame =快照(cam);videoFrameGray = rgb2gray (videoFrame);frameecount = frameecount + 1;如果numPts < 10%检测模式。bbox = faceDetector.step (videoFrameGray);如果~ isempty (bbox)%找到被检测区域内的角点。点= detectMinEigenFeatures (videoFrameGray,“投资回报”bbox (:));重新初始化点跟踪器。xyPoints = points.Location;numPts =大小(xyPoints, 1);释放(pointTracker);初始化(pointTracker xyPoints videoFrameGray);%保存分数的副本。oldPoints = xyPoints;将矩形[x, y, w, h]转换为an4个角的[x,y]坐标的m × 2矩阵。这%需要能够将边界框转换为显示%面部的方向。bboxPoints = bbox2points(bbox(1，:)));%将方框角转换为[x1 y1 x2 y2 x3 y3 x4 y4]insertShape要求的%格式。bboxPolygon =重塑(bboxPoints'， 1， []);%在检测到的人脸周围显示一个边界框。videoFrame = insertShape (videoFrame,“多边形”bboxPolygon,“线宽”3);%显示检测到的角。= insertMarker(videoFrame, xyPoints，)“+”，“颜色”，“白色”）;结束其他的%跟踪模式。[xyPoints, isFound] = step(pointTracker, videoFrameGray);visiblePoints = xyPoints(isFound，:);olddinliers = oldPoints(isFound，:);numPts = size(visiblePoints, 1); / /显示时间如果numPts > = 10估计旧点之间的几何变换%和新积分。[xform, inlierIdx] = estimateGeometricTransform2D(．..oldInliers visiblePoints,“相似”，“MaxDistance”4);oldInliers = oldInliers(inlierIdx，:); / / / / / /visiblePoints = visiblePoints(inlierIdx，:);对包围框应用变换。bboxPoints = transformpointforward (xform, bboxPoints);%将方框角转换为[x1 y1 x2 y2 x3 y3 x4 y4]insertShape要求的%格式。bboxPolygon =重塑(bboxPoints'， 1， []);在被跟踪的脸部周围显示一个边界框。videoFrame = insertShape (videoFrame,“多边形”bboxPolygon,“线宽”3);%显示跟踪点。videoFrame = insertMarker(videoFrame, visiblePoints，“+”，“颜色”，“白色”）;%重置点数。oldPoints = visiblePoints;选点(pointTracker oldPoints);结束结束使用视频播放器对象显示带注释的视频帧。步骤(放像机、videoFrame);%检查视频播放窗口是否已关闭。runLoop = isOpen(放像机);结束%清理。清晰的凸轮；释放(放像机);释放(pointTracker);释放(faceDetector);