How can i change the value of the color?

 The code works perfectly for pure red extract.I have a problem with the colour.I need it to be different.
 % 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(:,:,1), rgb2gray(data));
    %Use a median filter to filter out noise
    diff_im = medfilt2(diff_im, [3 3]);
    % Convert the resulting grayscale image into a binary image.
    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)
        counter=counter+1;
        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)))));
        %b=stract('X',strcat('X: ', num2str(round(bc(1)))), ' Y: ', num2str(round(bc(2))));
        %A(counter)=a;
        set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
    end
    hold off
end
% Both the loops end here.
The color of the object is this.
I've taken a snapshot from my webcam (the red plane)
The rgb value of the color >(32,0,0), <(132,0,0)
I tried to modify with redThrash with values 0.3,0.4,0.5 ....and it doe not work.
The value of the trashhold is 0.18...i tried even there but,it recognizes skin.
Please help,it is for an important thesis for my school !
<http://uploadimage.ro/img.php?image=7620_redcolour_x2zc.jpg >> http://uploadimage.ro/img.php?image=7620_redcolour_x2zc.jpg

Answer 1

[Image Analyst]

That code does not find only red objects. It thresholds the red channel. White, magenta, and yellow objects will also have a high red signal, and it will find those as well. Not sure who gave you that code but they don't know much about color segmentation. See my color segmentation demos in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[Sergiu Craciun]

My thesis is of this particular modification in the program. The sequence code diff_im = imsubtract(data(:,:,1), rgb2gray(data)); only extracts pure red objects with (255,0,0) value in rgb.can you please help me with a sequence to track red objects between (32,0,0) and (132,0,0) in rgb.Thank you !