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RGB Color Space Image Segmentation

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Hello All.
I have been trying to replace the original R, G and B components of an RGB image by applying the attached equations in MATLAB.
I don't know the functions to use. I have tried applying different filters but the results I get are inaccurate.


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Image Analyst
Image Analyst on 22 Apr 2020
Everything is zero except I hat if I hat if I'' is more than 0. But from equation (5), I'' is never anything but zero. Hence I hat will never be anything but zero either. I suggest you contact the author for the correct formulas, or look into imgradient().
Mrutyunjaya Hiremath
Mrutyunjaya Hiremath on 24 Apr 2020
There is a problem in given equations
Here is the reults, after some assumptions for intitial values, like Idash ... sigma ...
Muftahu  Kabir
Muftahu Kabir on 24 Apr 2020
@Mrutyunjaya Hiremath
Interesting.... After using which of the equations did you arrive at your result? I have been trying to get a similar result to yours using equation (4) but I couldn't. Can you please share the code you used?

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Accepted Answer

Mrutyunjaya Hiremath
Mrutyunjaya Hiremath on 25 Apr 2020
Hello Muftahu Kabir,
Here is the code ...
clear all;
close all;
I = imread('1.jpg');
figure, imshow(I);
IR = I(:,:,1);
IG = I(:,:,2);
IB = I(:,:,3);
I4 = I;
I41Index = find((IG - ((IR+IB)/2) + 15) > 0);
I4(I41Index) = 0;
I42Index = find((IR - IB) > 20);
I4(I42Index) = 0;
I43Index = find((IG - IR) > 15);
I4(I43Index) = 0;
figure, imshow(I4);
I5 = I4;
delta = 50;
I51Index = find(I4 > (255 - delta));
I5(I51Index) = 0;
I52Index = find(I4 < delta);
I5(I52Index) = 0;
figure, imshow(I5);
I6 = I5;
I61Index = find(I5 > 0);
I6(I61Index) = 255;
I62Index = find(I5 == 0);
I6(I62Index) = 0;
figure, imshow(I6);
imwrite(I6, 'I6.jpg');

  1 Comment

Muftahu  Kabir
Muftahu Kabir on 4 Jun 2020
Hello Mrutyunjaya Hiremath,
I truly appreciate your contribution.
It has gone a long way assisting me in doing my research. Thank you so much

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