Rectangle around the object, Bounding box,

조회 수: 116 (최근 30일)
Felix
Felix 2013년 9월 18일
댓글: Image Analyst 2023년 5월 14일
Hello, I used this code to make rectangle around the object at binary image:
st = regionprops(BW, 'BoundingBox' );
figure, imshow('MY_IMAGE.jpg')
rectangle('Position',[st.BoundingBox(1),st.BoundingBox(2),st.BoundingBox(3),st.BoundingBox(4)],...
'EdgeColor','r','LineWidth',2 )
but if I have more than one object, this code doesn't working How can I draw N rectangles for N objects on image? Thank you
  댓글 수: 4
Kimo Kalip
Kimo Kalip 2018년 7월 2일
The image segmentation strategy included in that tutorial works great for well defined, solid images on a relatively consistent background. However, what do you do when you're trying to work with objects that aren't perfectly defined or shaped? Like what if you had something with various holes like a slinky or spring?
Image Analyst
Image Analyst 2018년 7월 2일
Well that's where the art of designing an image analysis algorithm comes in. You're right - it's not so straightforward and easy. That's what keeps people like me employed.

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채택된 답변

Image Analyst
Image Analyst 2013년 9월 18일
Put it in a loop (untested)
for k = 1 : length(st)
thisBB = st(k).BoundingBox;
rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
'EdgeColor','r','LineWidth',2 )
end
  댓글 수: 9
Torkan
Torkan 2019년 10월 16일
Hi,
How can we define the length and width of these rectangles?
DANIEL SYAFIQ
DANIEL SYAFIQ 2023년 1월 4일
THANK YOU SO MUCH IMAGE ANALYST.

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추가 답변 (5개)

Tiago Almeida
Tiago Almeida 2017년 10월 11일
편집: Image Analyst 2017년 10월 11일
How can i draw the rectangles with the same size using this code?
labeledImage = bwlabel(A);
measurements = regionprops(labeledImage, 'BoundingBox', 'Area');
for k = 1 : length(measurements)
thisBB = measurements(k).BoundingBox;
rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
'EdgeColor','r','LineWidth',2 )
end
  댓글 수: 4
Image Analyst
Image Analyst 2018년 5월 4일
Try this:
allBB = zeros(length(measurements), 4);
for k = 1 : length(measurements)
thisBB = measurements(k).BoundingBox;
rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
'EdgeColor', 'r', 'LineWidth', 2)
allBB(k, :) = thisBB;
end
Maham Khan
Maham Khan 2018년 5월 7일
Thanks @Image Analyst

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Hafsa Asad
Hafsa Asad 2017년 1월 28일
편집: Hafsa Asad 2017년 1월 28일
Here is an even simpler way to do it if you have the binary image with white blobs
st = regionprops(my_binary_image, 'BoundingBox', 'Area' );
for ii= 1 : length(st)
Areai(ii)= st(ii).Area;
end
largest_blob_id= find(Areai==max(Areai));
imshow(my_binary_image)
rectangle('Position'[st(largest_blob_id).BoundingBox(1),st(largest_blob_id).BoundingBox(2),st(largest_blob_id).BoundingBox(3),st(largest_blob_id).BoundingBox(4)], 'EdgeColor','r','LineWidth',2 )
  댓글 수: 2
Image Analyst
Image Analyst 2017년 1월 28일
That would be good if he wanted to draw the box around only the largest blob instead of drawing "N rectangles for N objects". An even shorter way would be to get rid of the for loop like this:
st = regionprops(my_binary_image, 'BoundingBox', 'Area' );
[maxArea, indexOfMax] = max([st.Area]);
rectangle('Position'[st(indexOfMax).BoundingBox(1),st(indexOfMax).BoundingBox(2),st(indexOfMax).BoundingBox(3),st(indexOfMax).BoundingBox(4)], 'EdgeColor','r','LineWidth',2 )
Hafsa Asad
Hafsa Asad 2018년 9월 21일
Image Analyst, you are right. thanks.

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sidraa Aleem
sidraa Aleem 2018년 4월 4일
@Image Analyst I am trying to use the following code to do exactly what Felix wanted,but I am having error.
for k = 1 : length(st)
thisBB = st(k).BoundingBox;
rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
'EdgeColor','r','LineWidth',2 )
end
Error using rectangle Value not a numeric scalar Please help me to resolve it.

Masar Uthaib
Masar Uthaib 2019년 12월 1일
편집: Image Analyst 2022년 4월 3일
Hello
rectangle('Position',[st.BoundingBox(1),st.BoundingBox(2),st.BoundingBox(3),st.BoundingBox(4)],...
'EdgeColor','r','LineWidth',2 )
does not operate with me. Can anyone clarify to me what is wrong?
  댓글 수: 1
Image Analyst
Image Analyst 2022년 4월 3일
No one, except you, did that. This should work if you have a single blob:
rectangle('Position', st.BoundingBox, 'EdgeColor','r','LineWidth',2 )
If you have multiple blobs, try this:
measurements = regionprops(mask, 'BoundingBox');
allBB = vertcat(props.BoundingBox);
hold on;
for k = 1 : length(measurements)
thisBB = measurements(k).BoundingBox; % Or allBB(k, :)
rectangle('Position', thisBB, 'EdgeColor', 'r', 'LineWidth', 2);
end
hold off;

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Muhammad Zulkifli
Muhammad Zulkifli 2023년 5월 14일
How can i get bounding box ?
  댓글 수: 1
Image Analyst
Image Analyst 2023년 5월 14일
It has been explained about how to use regionprops to get the bounding box of blobs in your binary image. In short:
props = regionprops(binaryImage, 'BoundingBox');
allBoundingBoxes = vertcat(props.BoundingBox)

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