inampudi1
asked on
how to remove shadow from an image?
Hi,
I am trying to remove shadow from RGB 24 bit Image , I tried to adjust R<G<B channels seperatly. But with this image quality is improving image quality. But I am unable to remove shadow. Can you please get me any methods or any algoritham in pascal or vc++ for shadow remove in an image.
I am trying to remove shadow from RGB 24 bit Image , I tried to adjust R<G<B channels seperatly. But with this image quality is improving image quality. But I am unable to remove shadow. Can you please get me any methods or any algoritham in pascal or vc++ for shadow remove in an image.
What do you mean with shadow? Dark parts in the image? Can you give an example?
ASKER
Hi,
Actually some images will have shadows, which are taken during time of sunset. I want to get a good algorithm in vc++ or delphi. I am finding some Pdf's in net, they are full of mathematical formula's I need algorithm in C or Pascal. I am attaching the file please see it.
I got output corected image from net.
shadow-input.JPG
shadow-output.JPG
Actually some images will have shadows, which are taken during time of sunset. I want to get a good algorithm in vc++ or delphi. I am finding some Pdf's in net, they are full of mathematical formula's I need algorithm in C or Pascal. I am attaching the file please see it.
I got output corected image from net.
shadow-input.JPG
shadow-output.JPG
This is a very complex task. I'm not sure if an algorithm what can do this exists just like that at all...
ASKER
Hi,
Please check if any of the algorithm gives at least partial results. Then I will try to improve it.
Please check if any of the algorithm gives at least partial results. Then I will try to improve it.
I don't have an algorithm for this.
ASKER
Hi experts,
I saw some of the articles in the link given below.And some pdf's also.
http://ivrgwww.epfl.ch/~fredemba/shadows.html
http://www.cs.sfu.ca/~mark/ftp/Eccv02/shadowless.pdf
http://spie.org/x26321.xml?highlight=x2410&ArticleID=x26321
But all are giving some differentiation and integration and summation formulas. But I am not strong in
mathematics. Please can you check the links and can you guide me how to convert the algorithms into C or
Pascal.
I saw some of the articles in the link given below.And some pdf's also.
http://ivrgwww.epfl.ch/~fredemba/shadows.html
http://www.cs.sfu.ca/~mark/ftp/Eccv02/shadowless.pdf
http://spie.org/x26321.xml?highlight=x2410&ArticleID=x26321
But all are giving some differentiation and integration and summation formulas. But I am not strong in
mathematics. Please can you check the links and can you guide me how to convert the algorithms into C or
Pascal.
ASKER
Hi experts,
In some article I got the point that...."simply adding a constant value, in the log-domain, to the shadow regions resulted in good quality removal." How to get log domain of an image here?
In some article I got the point that...."simply adding a constant value, in the log-domain, to the shadow regions resulted in good quality removal." How to get log domain of an image here?
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ASKER
Hi experts
Above link is asking login Id . I dont have Login Id. do we need to pay some amount for getting register?
Above link is asking login Id . I dont have Login Id. do we need to pay some amount for getting register?
ASKER
Hi Ozo,
Please explain me in details about,"one simple technique is to supress the low frequencies in the Fourier transform of the log of the luminance"
Please explain me in details about,"one simple technique is to supress the low frequencies in the Fourier transform of the log of the luminance"
ASKER
i am waiting for reply of this question. Please give me solution.