On Nov 13, 8:12&#4294967295;am, "SteveSmith" <Steve.Smi...@SpectrumSDI.com> wrote:
> >I'm looking for a simple (need not be very efficient) VC++/C++ library
> >that does the image (png) convolution, 2D FFT. I would like to develop
> >a image search feature (http://www.dspguide.com/ch24/6.htm) with a VC+
> >+ based GUI around it.
>
> http://www.codeproject.com/KB/graphics/ImageConvolution.aspx
>
> >does have the convolution feature but not FFT. Anybody gone through
> >the same requirement?
>
> >Thank you
>
> The technique you mention is just image convolution with a target signal.
> The FFT is nothing more than a way of making the computations faster. &#4294967295;So
> if you want something simple, without needing efficency, you should be
> implementing the algorithm with convolution and forget about 2d FFTs.
> Regards,
> Steve

Thank you steve, that should work for me!!

I'm trying to implement the image search described here
http://www.dspguide.com/ch24/6.htm. I have to check for existence of a
target image. Upon convolution we will have some values, each value
proportional to the match.  There may one or more maximas depending on
repetition of the target. so is the case If target does not exist in
the source image. How could one conclusively say that target does
exist in the source or not?

>I'm looking for a simple (need not be very efficient) VC++/C++ library
>that does the image (png) convolution, 2D FFT. I would like to develop
>a image search feature (http://www.dspguide.com/ch24/6.htm) with a VC+
>+ based GUI around it.
http://www.codeproject.com/KB/graphics/ImageConvolution.aspx
>does have the convolution feature but not FFT. Anybody gone through
>the same requirement?
>
>Thank you
>

The technique you mention is just image convolution with a target signal. 
The FFT is nothing more than a way of making the computations faster.  So
if you want something simple, without needing efficency, you should be
implementing the algorithm with convolution and forget about 2d FFTs. 
Regards,
Steve


  

I'm looking for a simple (need not be very efficient) VC++/C++ library
that does the image (png) convolution, 2D FFT. I would like to develop
a image search feature (http://www.dspguide.com/ch24/6.htm) with a VC+
+ based GUI around it. http://www.codeproject.com/KB/graphics/ImageConvolution.aspx
does have the convolution feature but not FFT. Anybody gone through
the same requirement?

Thank you