Analyzing laser plasma interferograms with a continuous wavelet transform ridge extraction technique: the method

Analyzing laser plasma interferograms with a continuous wavelet transform ridge extraction technique: the method.

Laser plasma interferograms are currently analyzed by extraction of the phase-shift map with fast Fourier transform (FFT) techniques [Appl. Opt. 18, 3101 (1985)]. This methodology works well when interferograms are only marginally affected by noise and reduction of fringe visibility, but it can fail to produce accurate phase-shift maps when low-quality images are dealt with. We present a novel ...

Ridge extraction algorithms for one-dimensional continuous wavelet transform: a comparison

A Fast Localization and Feature Extraction Method Based on Wavelet Transform in Iris Recognition

With an increasing emphasis on security, automated personal identification based on biometrics has been receiving extensive attention. Iris recognition, as an emerging biometric recognition approach, is becoming a very active topic in both research and practical applications. In general, a typical iris recognition system includes iris imaging, iris liveness detection, and recognition. This rese...

A Wavelet Transform Based Method for Road Centerline Extraction

This paper introduces a new wavelet transform based method of road centerline extraction from high resolution remote sensing images. In the one dimensional case, we characterize different kinds of sudden changes of signals by comparing the magnitudes of the local extreme values of the wavelet transforms under different dilation scales of the same wavelet. The platform-like signals, which come f...

Continuous Wavelet Transform for Time-Varying Motion Extraction

Widespread use of digital multimedia data has led to the development of advanced processing techniques for them. Motion estimation is a fundamental step in the extraction of activity in videos, for tracking, motion segmentation, video classification and other applications. One large category of methods processes data in the spatial domain, and another in the frequency domain. This paper present...