SEGMENTATION

hi am doing project in automatic volume measurement of urinary bladder using ultrasound images using image processing . am trying out segmentation but i have a problem that my background and my region of interest are in same color. pls give me some idea n sample code get my roi alone automatically. sample image is in link <http://www.google.co.in/imgres?q=urinary+bladder+image+of+ultrasound+image&um=1&hl=en&sa=N&tbm=isch&tbnid=mVay97b56Hp0IM:&imgrefurl=http://www.medison.ru/uzi/eho400.htm&docid=8Tj1qHtWTbAzdM&imgurl=http://www.medison.ru/uzi/img/p400.jpg&w=640&h=480&ei=bnwFT4KuFIyiiAe3pMS8AQ&zoom=1&iact=hc&vpx=188&vpy=155&dur=2549&hovh=194&hovw=259&tx=182&ty=93&sig=102983391304477840786&page=1&tbnh=146&tbnw=195&start=0&ndsp=20&ved=1t:429,r:0,s:0&biw=1280&bih=832> my roi is center black region.pls any one help me..

[Image Analyst]

dinesh asked the same thing with the same image is http://www.mathworks.com/matlabcentral/answers/25266-background-removal - are you posting under two different names (bad etiquette/practice) or are you two working on the same project?

[dhanalakshmi]

DINESH AND MYSELF ARE WORKING ON SAME PROJECT.

[Image Analyst]

I expect that by now you've implemented successfully the simple algorithm I listed below, so go ahead and mark the question as solved.

Answer 1

[Image Analyst]

Try this:

1. Threshold for bright stuff
2. call imfill
3. retain the largest blob - that will be your mask.
4. multiply your mask by the image to get rid of the annotation.
5. threshold for the dark stuff - it will be arbitrary where you want to define the edges of the bladder.
6. call bwlabel
7. call regionprops
8. sort the measurements by area
9. the measurements of the largest blob will be your bladder measurements.

See my Image Segmentation Tutorial in my File Exchange:

Image Analyst's File Exchange

It's a generic, general purpose demo of how to threshold an image (of coins) to find blobs, and then measure things about the blobs, and extract a subset blobs based on their areas or diameters.

[dhanalakshmi]

thank you.it works

[daniel]

hi, could you please publish your code for ultrasound image segmentation?

i would like to extract specific part from the brain cortex of us image, and i wonder if it work for me.

Answer 2

[slama najla]

hello Can you help me? can you give me a exemple code in matlab for region of interest because i need this code very urgent thank

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

[Image Analyst]

http://blogs.mathworks.com/pick/2009/11/06/segmenting-coinsa-tutorial-on-blob-analysis/

[slama najla]

thank but i like to give me a code matlab for region of interest thank

[Image Analyst]

I did. Did you overlook my link on the segmentation tutorial? It picks out the coins. Each coin can be considered an ROI.

See my Image Segmentation Tutorial in my File Exchange:

Image Analyst's File Exchange

It's a generic, general purpose demo of how to threshold an image to find blobs, and then measure things about the blobs, and extract certain blobs based on their areas or diameters.

Answer 3

[Matt Kindig]

There is no generic code that we can send you--it entirely depends upon your image. Regions of interest can be identified using a number of different methods. Generally the approach is something like this:

- threshold the image to get logical (black&white) image

- perform some cleanup operations (dilation, filtering, etc.)

- use regionprops to identify distinct regions

- identify the desired region.

If you have the Image Processing Toolbox, the demos and examples in the Toolbox help show how to do all of these tasks. These should get you started.

P.S. By the way, you should start a new question rather than simply adding to this thread. Since this thread already has an accepted answer, a lot of people will simply skip over your question (overlooking the time stamp). Once you do that, however, continue to use that same question until your question is resolved, and then accept any answer.