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From: Saurabh Ghorpade on 4 Jul 2010 14:40
Hello,
i am using gray scale bmp images for an assignment. The images contain a container whose shadow is seen in the image. I want remove the shadow to calculate the diameter of the container. Please tell me possible ways to do it.
From: Christopher on 5 Jul 2010 00:55
"Saurabh Ghorpade" <ghorpadesaurabh(a)gmail.com> wrote in message <i0qkil$b3a$1(a)fred.mathworks.com>...
> Hello,
> i am using gray scale bmp images for an assignment. The images contain a container whose shadow is seen in the image. I want remove the shadow to calculate the diameter of the container. Please tell me possible ways to do it.

Is there any way you can provide a link to the images? There are many ways to do Image Processing and to pick the most suitable one usually requires some previous knowledge of the image content..

Chris
From: ImageAnalyst on 5 Jul 2010 01:25
Removing the shadow could be very tricky, for example in Adelson's
checker shadow illusion (http://web.mit.edu/persci/people/adelson/
checkershadow_illusion.html) but it may not be necessary to measure
the diameter of your objects. Post it to http://drop.io so we can
look at it.

In the meantime, some papers on shadows for you to skim:
http://iris.usc.edu/Vision-Notes/bibliography/shapefrom385.html#Three-Dimensional%20Information%20from%20Shadows
From: Luca on 21 Jul 2010 10:58
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <aa966f99-70d4-45ff-95fc-b946554e92d2(a)g19g2000yqc.googlegroups.com>...
> Removing the shadow could be very tricky, for example in Adelson's
> checker shadow illusion (http://web.mit.edu/persci/people/adelson/
> checkershadow_illusion.html) but it may not be necessary to measure
> the diameter of your objects. Post it to http://drop.io so we can
> look at it.
>
> In the meantime, some papers on shadows for you to skim:
> http://iris.usc.edu/Vision-Notes/bibliography/shapefrom385.html#Three-Dimensional%20Information%20from%20Shadows

Hi ImageAnalist,
I just want to ask you if there exist some removing shadow algorithm already implemented in matlab.
For example, in my case, I have to remove shadows from optical satellite image (like Quickbird), but I do not find any implemented code...

regards

Luca
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