How to label objects based on their area?

Dear all,

I have an image that contains many objects. I want to label each object with different color such that objects with the same area will have the same label color. In the same way, small objects will appear with a color located down of the jet color map (dark blue), while larger object will have a color located up of the jet color map (dark red). I am now using this code which label the objects randomly with different color

img = imread('real_sampel_dilate1.tif'); % input image attached here
%
I = im2bw(img);
I = ~I;
I = (I==0);
cc = bwconncomp(I,8);
s = regionprops(cc,img,'all');
L = labelmatrix(cc);
RGB_label = label2rgb(L, @jet, 'k', 'shuffle');
%
imshow(RGB_label); % the result randomly labeled of object attached here

Do anyone knows how to do such area-based labeling?

Any suggestion will be appreciated.

Best, Meshoo

Answer 1

[Explorer]

http://www.mathworks.com/matlabcentral/answers/112917-how-to-detect-hand

Have a look on answer of Image Analyst. He has labeled face and hand on the basis of area.

[Meshooo]

Thank you very much. I tried the following code but it doesn't work..

img = imread('real_sampel_dilate1.tif');
%
I = im2bw(img);
I = ~I;
I = (I==0); % invert the image
cc = bwconncomp(I,8); % could use 4-connected neighborhood also
s = regionprops(cc,img,'all');
L = labelmatrix(cc);
RGB_label = label2rgb(L, @jet, 'k', 'shuffle');
imshow(RGB_label);

Label the image

labeledImage = bwlabel(I);
measurements = regionprops(labeledImage, 'BoundingBox', 'Area');
for k = 1 : length(measurements)
  thisBB = measurements(k).BoundingBox;
  rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
  'EdgeColor','r','LineWidth',2 )
end

[Explorer]

These below mentioned lines are for drawing bounding box around every object in image.

for k = 1 : length(measurements)

thisBB = measurements(k).BoundingBox;
rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
'EdgeColor','r','LineWidth',2 )
end