Question

如何使用matlab vision.ForegroundDetector用网络摄像头代替输入视频文件。

hsrc = vision.VideoFileReader('viptraffic.avi','ImageColorSpace','Intensity','VideoOutputDataType','uint8');
hfg = vision.ForegroundDetector(...
       'NumTrainingFrames', 5, ... % 5 because of short video
       'InitialVariance', 30*30); % initial standard deviation of 30
hblob = vision.BlobAnalysis(...
       'CentroidOutputPort', false, 'AreaOutputPort', false, ...
       'BoundingBoxOutputPort', true, ...
       'MinimumBlobAreaSource', 'Property', 'MinimumBlobArea', 250);
hsi = vision.ShapeInserter('BorderColor','White');

hsnk = vision.VideoPlayer();
while ~isDone(hsrc)
     frame  = step(hsrc);
     fgMask = step(hfg, frame);
     bbox   = step(hblob, fgMask);
     out    = step(hsi, frame, bbox); % draw bounding boxes around cars
     step(hsnk, out); % view results in the video player
end
release(hsnk);
release(hsrc);

Answer 1

如果您有权访问图像采集工具箱，则可以将第一行替换为：

hsrc = imaq.VideoDevice('winvideo', 1, 'MJPG_640x480', ...
    'ReturnedColorSpace','grayscale', 'ReturnedDataType','uint8');

您需要根据网络摄像头支持的格式调整参数。只需查阅imaq.VideoDevice函数的文档。

同样只用while true替换循环测试，因为视频Feed始终没有完成：）

如何使用matlab vision.ForegroundDetector with webcam

1 个答案: