This for loop is making me crazy!!! Need some suggestions please

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Posted 30-Nov-11 0:18am

Sumal.V

Updated 1-Dec-11 5:52am

v13

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Manfred Rudolf Bihy 30-Nov-11 6:29am

Please add code tags when inserting code fragments and use proper indentation. It is much easier to read that way and looks way neater than without them.
Thanks for your cooperation!

CPallini 30-Nov-11 6:42am

Why it shouldn't re-calculate? Could you please elaborate?

Richard MacCutchan 1-Dec-11 11:43am

What is this?

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E.F. Nijboer · Answer 1 · 2011-11-30T01:14:00

It is best to start with the original image data because otherwise data would get lost in the process. When you click the button the result now would be the same every time. Otherwise the normalization would be done on an already normalized image and eventually the image won't be normal at all. It's like when you would bring all the values somewhat closer the average. If you repeat that process over and over, eventually all the values will just be the average.

Good luck!

CPallini · Answer 2 · 2011-11-30T02:17:00

Maybe I made a mistake in my computations, anyway, your trasnformation migh be written

d'_r,b = d_r,b - S_r(d_r,b)/S_r + S_rb(d_r,b)/S_rb

where

S_r is sum on index r
S_rb is sum on indices r,b.

The formula maybe re-written as

d'_r,b = d_r,b - F(b) + G

If you apply again the transformation, then you obtain (after some calculations)

d"_r,b = d_r,b - 2 F(b) + 2 G

and so on.

BTW there are some programming mistakes in the posted code (for instance, you forgot to free some allocated memory and you used C++'s delete for memory allocated with C's malloc).

This for loop is making me crazy!!! Need some suggestions please

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