Re: zernike moments question

On Mar 9, 12:12 am, aruzinsky <aruzin...@xxxxxxxxxxxxxxxxxxxx> wrote:
On Mar 8, 10:36 am, Adam Chapman





<adam.chap...@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Mar 8, 4:31 pm, aruzinsky <aruzin...@xxxxxxxxxxxxxxxxxxxx> wrote:

On Mar 8, 8:26 am, Adam Chapman

<adam.chap...@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi,

I have to calculate the zernike moments (http://homepages.inf.ed.ac.uk/
rbf/CVonline/LOCAL_COPIES/SHUTLER/node1.html) of an image as a step in
an image processing algorithm.

The problem I have is that you are only supposed to make the zernike
moment from the region where x^2+y^2<=1. This suggests that I have to
compress my pixel grid to fit in a circular shape with an edge radius
of 1.

Am i correct?

Adam

What "image processing algorithm?"

Im inputting the zernike moments into a neural net for character
recognition.- Hide quoted text -

- Show quoted text -

I have no experience with this, but, it seems to me that the
background of a character may as well be made up.  If you isolate the
character, you can put it against an artificial black background and
draw a circle around it any way you want.  A zero luminance background
won't contribute to a moment.- Hide quoted text -

- Show quoted text -

Yes I am using a binary image (1 for pixels belonging to the letter,
black otherwise). Thanks for the help

Adam
.

Relevant Pages

  • Re: zernike moments question
    ... an image processing algorithm. ... compress my pixel grid to fit in a circular shape with an edge radius ... Im inputting the zernike moments into a neural net for character ...
    (sci.image.processing)
  • Re: zernike moments question
    ... Not sure how you planned to compress your pixel grid. ... >>> I have to calculate the zernike moments (http://homepages.inf.ed.ac.uk/ ... background of a character may as well be made up. ...
    (sci.image.processing)