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From: Siddharth Magazine on 28 Jun 2010 18:54
Hi there. I desperately need help on this topic. I am trying to obtain pixel values for two black points automatically with a single command on Matlab workspace for an input image which is http://img4.imageshack.us/f/twopoints1.jpg/, in this image, there are two black points, and i want to find the pixel values of those two points automatically, instead of pointing at them and noting the values.

Please help on this topic asap.

Thanks
From: ImageAnalyst on 28 Jun 2010 18:59
Siddharth Magazine:
My image processing demo:

http://www.mathworks.com/matlabcentral/fileexchange/25157

will handle this perfectly - you just have to change the threshold
(like it explains in the comments) to find the dark blobs instead of
the bright blobs. It finds the centroids, intensities, etc.
-ImageAnalyst
From: Walter Roberson on 29 Jun 2010 02:09
"Siddharth Magazine" <magazinesiddharth(a)hotmail.com> wrote in message <i0b96c$qej$1(a)fred.mathworks.com>...
> I am trying to obtain pixel values for two black points automatically with a single command on Matlab workspace for an input image which is http://img4.imageshack.us/f/twopoints1.jpg/, in this image, there are two black points, and i want to find the pixel values of those two points automatically, instead of pointing at them and noting the values.

Hmmm, I've seen that image before...

In any case, you do _not_ have two black *points*, you have two black *blobs*. What output format are you looking for? A list of coordinates and pixel intensities for each of the blobs? Pixel intensities for the pixel nearest to the centroid of each of the blobs, in either order?
From: us on 29 Jun 2010 03:07
"Siddharth Magazine" <magazinesiddharth(a)hotmail.com> wrote in message <i0b96c$qej$1(a)fred.mathworks.com>...
> Hi there. I desperately need help on this topic. I am trying to obtain pixel values for two black points automatically with a single command on Matlab workspace for an input image which is http://img4.imageshack.us/f/twopoints1.jpg/, in this image, there are two black points, and i want to find the pixel values of those two points automatically, instead of pointing at them and noting the values.
>
> Please help on this topic asap.
>
> Thanks

a hint:
- note: i cannot access the image due to firewall restrictions
- for points/pels, see

help find;

us
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