background subtraction in x-rays

hello all,

i am working on an assignment which is background subtraction in
digital x-rays. i am working on MATLAB and am restricted to MATLAB as
my platform.

i am having quite a few issues & am actually stuck in the assignment.

i am enlisting them -->

1. though background subtraction ( BS ) seems a very common topic
there is no alogrithm that is clearly mentioned. most of them are
vague and strictly mathematical. i would be really greatful if some1
could point out an alogrithm which will help me is this respect.

2. the main problem is that BS is primarily for surveillance and hence
used for motion pictures. my images is however totally static. i am
using a reference image as a x-ray widout a patient and then another
image as my operating image which is a digital x-ray. as a result d
subtraction isnt actually givin me any noticeable results.

by reading the related papers i have tried to implement an algorithm
viz. HEIKKILA & OLLI on my images. i have just started out wid matlab
programming and am a beginner in this respect. treshold value has been
assumed on a trail & error basis as ther is no standard mentioned
value in the algo. the problem is that i am not gettin any results.

perhaps possibly coz my image is monochrome or then the algorithm is
not suited for such images. i am actually stuck wid it and am at my
wits end.

3. also wat quality measures should i consider to show that i am
actually enhancing the x-ray iamge? are there ne standard parameters
or then do i work on some of the statistical properties as my quality
measures?

hopin that all you experienced people could perhaps have some
guidelines for me or show me the way.

d worst part is that the submission time is just around d corner.

cheers,

ANUJAN.






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Relevant Pages

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  • Re: please help i am new need to find algorithm for background subtraction
    ... i don't know different methods in background subtraction for object detection and tracking to implement in matlab ... can any help me in finding the algorithm. ... In order to do background subtraction, you need to determine the background image. ... When your target comes into view then simply subtract your new image from your background image and find the absolute value of each difference pixel, and there you go, a background subtracted image for you to play with. ...
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