Matlab盒子视觉前景对象检测-未显示边界框

如何解决Matlab盒子视觉前景对象检测-未显示边界框

我正在使用vision.Foreground在快照框周围创建边框，以形成实时网络摄像头。仅显示重复拍摄的帧。

for i = 1:20
                frame = snapshot(app.webcamObject);
                detector = step(vision.ForegroundDetector,frame);
                se = strel('square',3);
                filteredForeground = imopen(detector,se);
                blobAnalysis = vision.BlobAnalysis('MinimumBlobArea',150);
                [areas,centroids,bBox] = step(blobAnalysis,filteredForeground);
                imnew = insertObjectAnnotation(frame,'rectangle',bBox,'hand','linewidth',3,'FontSize',24);
                imshow(imnew,'Parent',app.UIAxes2)
            end