background removal

hi, am doing my project in volumetric measurement of urinary bladder using ultrasound images.my Region of interest and background are in black color..i need to remove the ROI from background.pls help me out by giving some sample codes too.

[Cecilia Adriana]

Hi, Dinesh.

Would you upload your sample image first?

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

[dinesh p]

hi....how can i upload the .zip file.....i couldn't find any such option to upload....otherwise please provide your mail id...i will mail you...

thx

[dinesh p]

http://www.google.co.in/imgres?q=ultrasound+image+of+a+urinary+bladder&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=W3QFT4epFIeOiAfl-s2PCg&zoom=1&iact=rc&dur=396&sig=102983391304477840786&page=1&tbnh=146&tbnw=195&start=0&ndsp=20&ved=1t:429,r:0,s:0&tx=129&ty=39&biw=1280&bih=832

this is sample image link.