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

Question

Luigi 2014-2-10

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https://ww2.mathworks.cn/matlabcentral/answers/115573-hello-i-am-doing-colour-recognition-as-a-project-for-my-third-year-at-uni-currently-i-am-able-to-r

回答： Image Analyst 2014-3-17

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