MATLAB: Get the position of pixels with specifed color

image processing

Hi! I have a problem.I have a picture with two circle in it.A red and a green.I want to get the postion of their centers and connecting them and how can I get the position of all red pixel in that picture.Please help me and thanks a lot

Best Answer

I answered about finding the positions a moment ago in response to your earlier post.

For the matter of finding all the red pixel in an image, first you have to define what "red" means. If a pixel has red turned on as high as it can go also happens to have blue turned on to (say) 1/10th of the maximum, then is that pixel still "red" ? If so, then how far could the intensity of the red component be reduced and you would still deem the pixel to be "red" instead of "purple" ?

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MATLAB: How to get the hue/saturation of a grayscale image

Here is how to get the hue and saturation image for a grayscale image:

hueImage = zeros(size(grayscaleImage));
saturationImage = zeros(size(grayscaleImage));

Of course, they are both all zero for a monochrome, grayscale image. Why would they not be? Were you expecting something different?

MATLAB: How to color a binary image

bin = rand(320, 200) > 0.5;  % Binary test image
R   = 1;  % Value in range [0, 1]
G   = 1;
B   = 1;
RGB = cat(3, bin * R, bin * G, bin * B);

Now the pixels which have the value 1 in the bin image have the value [R,G,B] in the RGB image, while the other pixels are black.

Alternatively:

CMap = [0.5, 0.2, 0.9;  0.1, 0.8, 0.3];
RGB  = ind2rgb(bin + 1, CMap)

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MATLAB: How to get the hue/saturation of a grayscale image

MATLAB: How to color a binary image

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