how to determine the size of the object using image processing

I want to specify the size of the object based image processing. The picture is a glass display in 2D, where there are a few rules: 1. I use to get live video images to be processed 2. Live video will get the picture, then immediately performed image processing such as: segmentation process and labeling process 3. Once labeling is complete, can be specified length of parallel sides and 2 pieces height of the object in pixels (to get the width of each of the sides and the height of the glass) 4. Calibrating the measure that has been in the can in pixels to centimeters

well, i'll simplify my question,, everybody should know the trapezoidal where it has two parralel sides and a height. my questions : how to count wide of trapezoidal using image processing (include precesses such as :segmentation, labelling,pixel calibration to centimeter)

I really hope the help of friends in this forum. Thank you

Answer 1

[Image Analyst]

See my image segmentation tutorial where I go over thresholding, labeling, and measuring. Also, post your image, say to http://snag.gy

[suryani annisa]

well,, i understand ur image segmentation tutorial. thanks, but next, i still have questions. my image just like a trapezoidal. u know, a trapezoidal has two parralel sides and a height. After i labelled the image, what syntaxs that should use to define and know where is the two parralel sides and a height located, so i can know widht of two parralel sides and height of trapezoidal. so i can count wide of this trapezoidal. this is my image illustration <http://www.4shared.com/photo/b0YuDMB2/ilustrasi_gelas.html> image (a) is size in pixels image (b) is size in centimeter or mm

[Image Analyst]

Your link doesn't work. To find the "corners" or "kinks" in the perimeter, first get the perimeter of the object using bwboundaries(), then refer to the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_find_.22kinks.22_in_a_curve.3F

[suryani annisa]

oh,, excuse me,,, because of this " < > ", my link doesnt work.. well, i renew it , this should work :D

http://www.4shared.com/photo/36bYr3sd/ilustrasi_gelas_1.html

[Image Analyst]

OK, works now. Roger's "kink" finding method should work fine for those images.

[suryani annisa]

could u gimme link of that method?

[Dhana Rizky]

Can you help me to get size of every room at floor plan picture of home and detect the kind of every room from text in the room there?

[Image Analyst]

@Dhana Rizky, See

http://www.visionbib.com/bibliography/contents.html

• 23.3.6.3 Floorplans, Floor Plans, Building Interiors
• 23.3.6.3.1 Room Layout

Answer 2

[giridhar H M]

What are the applications of measuring diameter of an object within an image using MATLAB

[ABDULLAH WAHID]

Hi guys

Is there anyone to explain how to find the height of an object within an image using Matlab????

[Image Analyst]

Yes, call regionprops() and ask for the bounding box. The bounding box format is [xLeft, yTop, width, height] so get the 4th column.

props = regionprops(mask, 'BoundingBox');
boundingBoxes = vertcat(props.BoundingBox);
heights = boundingBoxes(:, 4)

See my Image Segmentation Tutorial for a full demo:

Image Analyst's File Exchange

Answer 3

[Thorsten]

Start with point 1, see how far you can get, succeed and process with point 2, and so on, or ask a more specific question.

[suryani annisa]

my image just like a trapezoidal. u know, a trapezoidal has two parralel sides and a height. After i labelled the image, what syntaxs that should use to define and know where is the two parralel sides and a height located, so i can know widht of two parralel sides and height of trapezoidal. so i can count wide of this trapezoidal. this is my image illustration <http://www.4shared.com/photo/b0YuDMB2/ilustrasi_gelas.html> image (a) is size in pixels image (b) is size in centimeter or mm