How to create a flexible rectangular box with a height and widht line at the center so that I can measure the height and width of the particular object in the image
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Ankit Gupta
on 6 Jun 2014
Commented: Image Analyst
on 10 Jun 2014
Hi All,
I have an image , right now I am using imline to calculate the height and width of the object in an image, I am wondering if have some tool in which we can create box around the object the perpendicular height and width line to measure. is there any tool or a way to create in matlab
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Accepted Answer
Image Analyst
on 8 Jun 2014
Edited: Image Analyst
on 8 Jun 2014
You can use regionprops() to get the bounding box (length and width parallel to the image edges), convex hull, and major and minor axis lengths (fitting the blob(s) to an ellipse). See my Image Segmentation tutorial for a demo: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862.
If you want the farthest two points in an image and the cross sectional width at the mod point, then let me know, because that's not built in.
More Answers (3)
Matt J
on 10 Jun 2014
Edited: Matt J
on 10 Jun 2014
I think the easiest compromise is to use impoly to draw an approximate rectangle around the tooth,
h=impoly(gca,'Closed',1);
Then, you can replace the polygon with its bounding rectangle using rectify(h) below. It relies on minboundrect from the File Exchange. You can tweak the vertices of the polygon interactively and re-apply rectify(h) until you are satisfied with the positioning.
function rectify(h)
pos=getPosition(h);
[rectx,recty] = minboundrect(pos(:,1),pos(:,2));
newpos=[rectx,recty];
setPosition(h,newpos(1:end-1,:));
end
Matt J
on 8 Jun 2014
Another approach to consider is to use regionprops to compute the area and perimeter of the object. From the area and perimeter, you can solve for width and height.
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