Placing a Title on Bounding Box

Question

Amanda Johnson 2014-8-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/146554-placing-a-title-on-bounding-box

回答： thang anh 2018-5-2

I would like to be able to add the title 'Defect' to my bounding box below. I have seen this done in many other applications such as object tracking. But I cannot seem to get it to work. Also, could this be done for multiple bounding boxes. Here is the code I have sof the bounding boxes:

%% Display Bounding Box

 figure, imshow(DifferenceOf2), 
title('Subtraction of Dialated Edge Template'),
[L ,Num] = bwlabel(DifferenceOf2);    
 stats = regionprops(DifferenceOf2, 'basic');
 stats(1).Area;,  ..., stats(end).Area;
    stats.Area
 allArea = [stats.Area];
        s  = regionprops(DifferenceOf2, 'all');
        s(1)
        centroids = cat(2, s.Centroid);
 hold on
 plot(centroids(:,1), centroids(:,2), 'r*')
        for n=1: length(s)
          rectangle('Position', s(n).BoundingBox, 'EdgeColor', 'g', 'LineWidth',2), title('Detected Defect')
      end
        hold off

.

. .

I would like have something like the figure below. I would rather it display the area and/or centroid of the defect as opposed to just 'Defect'.

.

. .

Please and Thank you for your help.

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Answer 1

Chad Greene 2014-8-6

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Instead of the title command, consider using text. You can pin the text to some x,y location, then align the text around the pinning point by 'verticalalignment' and 'horizontalalginment' options.

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Amanda Johnson 2014-8-6

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Thank you for your help! I was able to get the text to appear in my figure, and changed it to red. I just used the values from the centroid for the X and Y values.

.

 hold on
         plot(centroids(:,1), centroids(:,2), 'r*')
        for n=1: length(s)
          rectangle('Position', s(n).BoundingBox, 'EdgeColor', 'g', 'LineWidth',2), title('Defected Detect')
        H= text( centroids(:,1) +5, centroids(:,2),'Thank you Chad Greene! ');
         set(gcf,'DefaultTextColor','red')
      end
        hold off

.

Chad Greene 2014-8-6

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Great, glad it works. Just a note, you don't need to change the text color of the whole figure if you don't want to. You could change the color of just that text bit by

H= text(centroids(:,1) +5, centroids(:,2),'You''re welcome Amanda Johnson','color','red','fontsize',44);

or even

H= text(centroids(:,1) +5, centroids(:,2),'You''re welcome Amanda Johnson');
set(H,'color','red','fontsize',44)

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Answer 2

Christopher Berry 2014-8-6

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What you are looking for is either annotation. You can also you sprintf to get the string formatted with the information you want. For example,

str = sprintf('Defect at (%0.2f,%0.2f)',32.32443,1.1233)
annotation('textbox',[0.2,0.4,0.1,0.1],'String',str)

For your case, you can the the [x y width height] (given in my example as [0.2,0.4,0.1,0.1]) information for the annotation from your bounding box data.

Take a look at the documentation for annotation here

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Amanda Johnson 2014-8-6

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hey hey hey!! making progress... Thank you!

 hold on
         plot(centroids(:,1), centroids(:,2), 'r*')
         for n=1: length(s)
          rectangle('Position', s (n).BoundingBox, 'EdgeColor', 'g', 'LineWidth',2), title('Defected Detect')
         H= text( centroids(:,1) +5, centroids(:,2), 'Thanks Christopher Berry...  This is the actual Centroid! ');
         set(gcf,'DefaultTextColor','red');
    str = sprintf('Defect at (%0.2f,%0.2f)',centroids(:,1), centroids(:,2))
    annotation('textbox',[0.5,0.4,0.1,0.1],'String',str)
      end
        hold off
 .