In this paper, we investigate the application of the EMD to automatically reduce speckles on the fringe pattern. It is
found that the number of the removed intrinsic mode functions (IMFs) is sensitive to the period of the fringe pattern, but
not sensitive to the speckle size and the speckle amplitude. Thus, a database system based on statistic simulations for
finding the optimization of removing speckles is built. With this database, more than 80% speckles on the fringe pattern
can be robotically reduced.
We present a database system based on the empirical mode decomposition (EMD) to automatically reduce the speckle in
a fringe pattern. With reference to the database, speckles on the fringe pattern can be efficiently and robotically reduced.
Percentage of the removed speckles can be predicted as well.
A database system based on the empirical mode decomposition (EMD) to automatically reduce the subjective speckles in
a fringe pattern is presented. To accurately evaluate the performance of speckle-reduction by the EMD, a method to
design a computer generated signal is proposed as well. The simulation showed that the number to removed IMFs is
changed when the period of the computer generated signal or the signal-to-noise ratio varies. Thus, we built up a
database to identify the required number of removed IMFs. With reference to the database, speckles on the fringe pattern
can be efficiently and robotically reduced.
Phase-extraction from fringe patterns is an inevitable procedure in many applications, such as interferometry, Moiré
analysis, and profilometry using structured light illumination. Errors to phase-extraction always occur when the signal-to-
noise ratio is weak. In this paper, we use the empirical mode decomposition (EMD) with a generalized analysis model
to reduce the white noise from a fringe pattern. It is found that phases can be extracted with high accuracy once noise-reduction
is performed with this model.
The speckle that is formed in coherent illumination confuses efforts to record an object's fine details. The confusion is
particularly severe in optical metrology and microscopy. In this paper, a scheme using the empirical mode
decomposition (EMD) to remove speckles is proposed. This makes it possible to accurately evaluate phases from a
fringe pattern illuminated by a coherent light source.
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