How to label coins after recognizing them?

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Hi everyone! I hope everything is great.
I have a question about coin recognition. I'm new to image processing and I'm trying to recognize the coins, label them and calculate the total amount.
Here is my code;
img = imread('bp3.jpg');
I = rgb2gray(img);
imshow(I)
bw = imbinarize(I);
figure; imshow(bw)
bw = bwareaopen(bw, 400);
figure; imshow(bw)
se = strel('disk', 3);
bw = imclose(bw, se);
bw = imfill (bw, 'holes');
figure; imshow(bw);
[r, num] = bwlabel(bw);
prop = regionprops('table',bw,{'Area','centroid'});
% kurus5=0;
% kurus10=0;
% kurus25=0;
% kurus50=0;
% tl1=0;
total=0;
for i=1:num;
switch logical(true)
case prop.Area(i)> 1.4e+06
rgb = insertText(I,[prop.Centroid(i,1) prop.Centroid(i,2)],'1tl','FontSize',48,'TextColor','black');
total=total+1;
%tl1=tl1+1;
case prop.Area(i)>1.2e+06 && prop.Area(i)<1.4e+06
rgb = insertText(I,[prop.Centroid(i,1) prop.Centroid(i,2)],'50kr','FontSize',48,'TextColor','black');
total=total+0.5;
%kurus50=kurus50+1;
case prop.Area(i)>8.7e+05 && prop.Area(i)<1.2e+06
rgb = insertText(I,[prop.Centroid(i,1) prop.Centroid(i,2)],'25kr','FontSize',48,'TextColor','black');
total = total + 0.25;
%kurus25=kurus25+1;
case prop.Area(i)>6.4e05 && prop.Area(i)<8.7e05
rgb = insertText(I,[prop.Centroid(i,1) prop.Centroid(i,2)],'10kr','FontSize',48,'TextColor','black');
total = total + 0.10;
%kurus10=kurus10+1;
otherwise
rgb = insertText(I,[prop.Centroid(i,1) prop.Centroid(i,2)],'5kr', 'FontSize',48,'TextColor','black');
total = total + 0.05;
%kurus5=kurus5+1;
end
end
subplot; imshow(rgb)
title(['Total Amount:',num2str(total),'TL'])
I can calculate the total amount but the problem is I can't label them all. Only one of the labels is shown. (It is 5kr for this example.) And let say if I delete '5kr' part, then only '10kr' label would shown. However I can't show them all at once.
I don't know how to fix that and I'd be glad if you can help me. Thanks in advance.
  2 Comments
Aysenur Atagün
Aysenur Atagün on 17 Jun 2022
Hi Jan!
Thank you very much for both your answer and comment. I fixed my code with your suggestions and now it works. I used logical(true) because I thought my loop works only for once and that might be solution.
I'm not sure what you're asking about but I found the area informations with prop command then I used them in the loop. But now I deleted double checks as you mentioned below.
Lastly, I replace 'subplot' with 'figure' and now it's all good.
Thank you again. All the best,
Aysenur

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Accepted Answer

Jan
Jan on 17 Jun 2022
Edited: Jan on 17 Jun 2022
rgb = insertText(I,[prop.Centroid(i,1) prop.Centroid(i,2)],'5kr', ...
'FontSize',48,'TextColor','black');
This inserts the text into the original image I in each iteration and former changes are overwritten.
Better:
rgb = I; % Create a copy to accumulate the insertes text objects
for i = 1:num
if prop.Area(i) > 1.4e+06
msg = '1tl';
totalAdd = 1.0;
elseif prop.Area(i) > 1.2e+06 % No need to check Area(i) <= 1.4e6 again
msg = '50kr';
totalAdd = 0.5;
... and so on, please complete this by your own
end
% Avoid repeated code, but use variables:
rgb = insertText(rgb, [prop.Centroid(i,1), prop.Centroid(i,2)], msg, ...
... % ^^^ not the original image I
'FontSize',48,'TextColor','black');
total = totalAdd;
end
If you want to change e.g. the fontsize, you have to modify one line only with this method.

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