In last decade, wavelet transform has been recognized as a
powerful tool in a wide range of applications, including
image/video processing, numerical analysis, and
telecommunication. The advantage of wavelet is that wavelet
performs an MRA of a signal with localization in both time
and frequency .In addition to this, functions with
discontinuities and functions with sharp spikes require fewer
wavelet basis vectors in the wavelet domain than sine cosine
basis vectors to achieve a comparable approximation. Wavelet
operates by convolving the target function with wavelet
kernels to obtain wavelet coefficients representing the
contributions in the function at different scales and
orientations. Wavelet or Multiresolution theory can be used
alongside segmentation approaches, creating new systems
which can provide a segmentation of superior quality to those
segmentation approaches computed exclusively within the
spatial domain.