detecting colours

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FIR
FIR 2012-2-23
编辑： Anusha 2013-10-25
I want to detect both brown and whit colours,can anyone tell how to proceed plz

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回答（2 个）

Jan
Jan 2012-2-23
You find a lot of color detection questions in this forum. Please take the time to read, how to detect red and yellow colors, and make a transfer to brown and white.
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FIR
FIR 2012-2-23
JAn the code fro yellow is
data=imread('myimage.jpg')
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)
bb = stats(object).BoundingBox;
bc = stats(object).Centroid;
rectangle('Position',bb,'EdgeColor','g','LineWidth',2)
plot(bc(1),bc(2), '-m+')
a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '
G: ', num2str(round(bc(2)))));
set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'green');
end
hold off,please tell in which line have to change for brown and white
Jan
Jan 2012-2-25
In "diff_im = imsubtract(data(:,:,1), rgb2gray(data));" you subtract the grey value from the red component. Are you sure this concerns the color yellow?!

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Image Analyst
Image Analyst 2012-2-23
See my color detection examples:
http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
I detect colors in three different ways.
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FIR
FIR 2012-2-23
I mean brown color MR.Analyst
Image Analyst
Image Analyst 2012-2-25
Yes, I read that. Both brown and whit. I know. It should be easy to modify my apps, in fact the delta E app will work right out of the box. So how did it go? Do you have it working yet? By the way your code in your comment to Jan has nothing whatsoever to do with color segmentation, your comments notwithstanding. It just doesn't - I don't know why you think it should.

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