Moving Object Detection in Matlab

i hav run this code in Matlab 2013a, and detected the moving object, the problem is, i am not able to obtained the background sequence without object.......

%Moving Object Detection in Matlab

clc clear all

% Read movie

SF = 1; %Starting Frame EF = 200; %Ending Frame MV = mmreader('video.avi'); %To read Movie

img = read(MV,1); %reading particular frame A = double(rgb2gray(img)); %motion vector works on Gray Image formate [height width] = size(A); %Movie size?

% motion estimation h1 = figure(1); for f = SF: EF %Frame from SF To EF B = A; img = read(MV,f); A = double(rgb2gray(img));

    %Foreground Detection
    thresh=65;
    fr_diff = abs(A-B);
    for j = 1:width
    for k = 1:height
        if (fr_diff(k,j)>thresh)
            fg(k,j) = A(k,j);
        else
                    fg(k,j) = 0;
        end
        end
    end

    subplot(2,2,1) , imagesc(img), title (['Orignal Sequence Frame#',int2str(f)]);
    subplot(2,2,2) , imshow(mat2gray(A)), title ('Previous Frame');
    subplot(2,2,3) , imshow(mat2gray(B)), title ('Next Frame');
    subplot(2,2,4) , imagesc(fg), title ('Foreground');

    hold off;
    pause (.5);
end

Answer 1

[Dima Lisin]

If you have the Computer Vision System Toolbox, try using vision.ForegroundDetector.

[Mohd Nayeem]

First of all thanks u very much for the acknowledgement.....

yes i tried with vision.ForegroundDetector with CV toolbox but the obtained output was just the object detection in a sequence....

i have successfully detected moving object (foreground) in a video sequence, but the problem i am still facing is to obtain only the background image.....

hope u understand my question, and thanks in advance....

[Dima Lisin]

Oh, I see. The simplest thing to do would be to take some number of video frames, and compute the median value for each pixel. That may give you a reasonably good image of the background, depending on how much motion there is in the scene.

If you have the foreground masks produced by vision.ForegroundDetector, then you can exclude the pixels known to be foreground from your computation. In this case you may even be able to use the mean instead of median.

[Besly Thomas]

      Could you share the code for " to take some number of video frames, and compute the median value for each pixel.". I tried but its giving error while running. I need to find the bakground in a similar way. Thanks.