how to use live video from webcam with foregrounddetector

i have to tack using live live video from webcam and track an object using foregrounddetector, my code is

vision.ForegroundDetector
clc;    
close all;  
imtool close all;  
clear;
workspace;  
fontSize = 8;

foregroundDetector = vision.ForegroundDetector('NumGaussians', 3,'MinimumBackgroundRatio',0.9, ... 'NumTrainingFrames', 700); blobAnalysis = vision.BlobAnalysis('BoundingBoxOutputPort', true, ... 'AreaOutputPort', false, 'CentroidOutputPort', false, ... 'MinimumBlobArea', 250);

vid = videoinput('winvideo', 1, 'YUY2_320x240'); %select input device hvpc = vision.VideoPlayer; %create video player object src = getselectedsource(vid); vid.FramesPerTrigger =1; vid.TriggerRepeat = Inf; vid.ReturnedColorspace = 'rgb'; src.FrameRate = '30'; start(vid)

        i=0;
        while (i<=20)

data = getsnapshot(vid); subplot(2,2,1); imshow(data); foreground = step(foregroundDetector, data); subplot(2,2,2); imshow(foreground); se = strel('square', 3); filteredForeground = imopen(foreground, se);

% u = 0.9; % if i == 0 % bg = zeros(size(data)); % else % bg = (1-u)*double(data) + u*bg; % end % dif = abs(data-uint8(bg) ); % % grayImage = rgb2gray(dif);% Convert to gray level % level = 0.1; % bw = im2bw( dif, level); % BW5 = imfill(bw,'holes'); % bw6 = bwlabel(BW5, 8);

bbox = step(blobAnalysis,filteredForeground); result = insertShape(data, 'Rectangle', bbox, 'Color', 'green'); % subplot(1,1,1); % imshow(result); step(hvpc, result); stop(vid) flushdata(vid); i=i+1; end

Answer 1

[Dima Lisin]

You would either need to have the Image Acquisition Toolbox, or MATLAB version R2014a, which includes support for getting video from a webcam in base MATLAB.