count and plot red and blue colors from the pic

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Avia Lavon
Avia Lavon am 24 Nov. 2022
Kommentiert: Avia Lavon am 6 Dez. 2022
I have a flourescence image (in tif format) with blue and red coloros
and i whant to quantify the amnmount of red and blue color in the picture
and draw/plot the recognized red and blue, to be able to check that I had choose a good range for recognizing red and blue colors.
I have this code to count the colors but i have not succeded to draw it
I would very appriciate your help.
RGB = imread('pic1.tif');
HSV = rgb2hsv(RGB);
[h,s,v] = imsplit(HSV);
hue = h*360;
[rows,cols] = size(hue);
num_pixels = rows*cols;
% red range: 0-20, 340-360
[red_ind, ~] = find(hue<=20 | hue>=340);
red_percentage = (length(red_ind)/num_pixels)*100;
fprintf('The red percentage of the image is : %.2f \n', red_percentage);
% blue range: 200-260
[blue_ind, ~] = find(hue<=260 & hue>=200);
blue_percentage = (length(blue_ind)/num_pixels)*100;
fprintf('The blue percentage of the image is : %.2f \n', blue_percentage);

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Ishan
Ishan am 1 Dez. 2022
Hi Avia,
I ran your code for this image, and it gave a reading of 55.38 for red and 33.35 for blue. However, by plotting the recognized red and blue I believe you are trying to highlight certain sections of the image which lie in that range of hue which you desire. If that is the case, you can refer to the numerous colour segmentation methods listed on File exchange: -
Hope this helps resolve your problem!
  1 Kommentar
Avia Lavon
Avia Lavon am 6 Dez. 2022
Hi Ishan.
Thank you for your reply.
I am not the segmentation is what i am looking for.
By ploting recognized pixeles i just want to compare to original image by eye and check that my recognition was good enough.

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