Hello, I am doing colour recognition as a project for my third year at uni. Currently I am able to recognise and track red, green and blue. However, I would like to fire an action for instance when green is spotted. Any one can give me an idea?thanks

my codes:

a = imaqhwinfo; [camera_name, camera_id, format] = getCameraInfo(a);

% Capture the video frames using the videoinput function % You have to replace the resolution & your installed adaptor name. vid = videoinput(camera_name, camera_id, format);

% Set the properties of the video object set(vid, 'FramesPerTrigger', Inf); set(vid, 'ReturnedColorspace', 'rgb') vid.FrameGrabInterval = 5;

%start the video aquisition here start(vid)

% Set a loop that stop after 100 frames of aquisition while(vid.FramesAcquired<=200)

    % Get the snapshot of the current frame
    data = getsnapshot(vid);

    % Now to track red objects in real time
    % we have to subtract the red component 
    % from the grayscale image to extract the red components in the image.
    diff_im = imsubtract(data(:,:,2), rgb2gray(data));

    stat = diff_im;

    diff_im = medfilt2(diff_im, [3 3]);

    diff_im = im2bw(diff_im,0.18);

    % Remove all those pixels less than 300px
    diff_im = bwareaopen(diff_im,300);

    % Label all the connected components in the image.
    bw = bwlabel(diff_im, 8);

    % Here we do the image blob analysis.
    % We get a set of properties for each labeled region.
    stats = regionprops(bw, 'BoundingBox', 'Centroid');

    % Display the image
    imshow(data)

    hold on

    %This is a loop to bound the red objects in a rectangular box.
    for object = 1:length(stats)
        bb = stats(object).BoundingBox;
        bc = stats(object).Centroid;
        rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
        plot(bc(1),bc(2), '-m+')
        a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
        set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
    end

    hold off
end

% Stop the video aquisition. stop(vid);

% Flush all the image data stored in the memory buffer. flushdata(vid);

Do I need to use an if statement? if yes, how do I create a reference variable? Thank you

Answer 1

[Image Analyst]

See my color segmentation demos: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 as well as File Exchange submissions like http://www.mathworks.com/matlabcentral/fileexchange/28757-tracking-red-color-objects-using-matlab