Is there any algorithms which can detect the pattern in any place of input signal ?
Convolutional Neural Networks can tolerate shift and scale variations. They are mostly used in invariant object recognition problems but I think it is also used in other applications such as speech recognition.
Mohammad,
Some of the Invariant features are
1. Invariant moments ex. Hu, complex, Zernike, fourier etc.
2. SIFT features
3. Rotation-invariant local binary pattern
Hope this Helps!
Hi,
actually, I am searching for shift invariant pattern recognition algorithm by neural network. I won't to use local feature extractor like SIFT.
There is an additional constaint which has to be mentioned. Any invariance approach, no matter whether you apply a neural network or whatever has to be researched regarding its invariance properties, that is, how an approach is able to separate (or to distinguish) different patterns: Seminal work which describes inavariance properties was published by Emmy Noether at the beginning of the 20th century.
Many publication on the a/m topic was published by Hans Burkardt / Un Freiburg (now Emeritus) et. al. Many of these papers are available online. One of his PhD strudents published some interesting approaches:
http://www.informatik.uni-trier.de/~ley/pers/hy/s/Schulz=Mirbach:Hanns.html
You can use the property of shift invariance of the Fourier power spectrum. If you compute FFT of the image and take the abs of all the resulting complex values (or - equivalently - the square of the abs), then you've got shift-invariant representation (ignoring the wrapping at the borders).
You may also do the log-polar mapping trick to get robust against changes of scale and rotation (see Fourier-Mellin transform).
Dose anyone has idea about using self organization or Hebbian theory?
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