cfamily: Ridge Chaining Procedure
Description
Chains the ridge estimates produced by the function crc.Usage
cfamily(ccridge, bstep=1, nbchain=100, ptile=0.05)
Arguments
ccridge
unchained ridge set as the output of the function crc bstep
maximal length for a gap in a ridge.
nbchain
maximal number of chains produced by the function.
ptile
relative threshold for the ridges.
Value
- Returns the results of the chaining algorithm
- ordered mapimage containing the ridges (displayed with different colors)
- chain2D array containing the chained ridges, according to the chain data
structure
chain[,1]: first point of the ridge
chain[,2]: length of the chain
chain[,3:(chain[,2]+2)]: values of the ridge
- nbchainnumber of chains produced by the algorithm
Details
crc returns a measure in time-frequency (or time-scale)
space. cfamily turns it into a series of one-dimensional
objects (ridges). The measure is first thresholded, with a relative
threshold value set to the input parameter ptile. During the chaining
procedure, gaps within a given ridge are allowed and filled in. The
maximal length of such gaps is the input parameter bstep.References
See discussion in text of ``Practical Time-Frequency Analysis''.