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fsaddles

$ \bigcirc$Name


fsaddles Position and value of saddle points in bilinear interpolation




$ \bigcirc$Command Synopsis


fsaddles image saddles .



image : Input fimage

saddles : Output fimage of saddle points

. (screen output) : Number of saddle points




$ \bigcirc$Function Summary


int fsaddles (pImage , pSaddlesImage )

Fimage pImage , pSaddlesImage ;




$ \bigcirc$Description


This module computes the values at the saddle points in a bilinear interpolated image. The resulting image has one column and one line missing compared to the original image. The value at (i, j) is the one at the saddle point in the dual pixel of corners (i, j), (i + 1, j), (i, j + 1) and (i + 1, j + 1) if there is one, and FLT_MAX (defined in math.h) if there is no saddle point inside the dual pixel. A more appropriate value would have been NAN (Not A Number), but this value is not always defined in math.h.

As the resulting image contains values (or rather non-values) not easily representable, it is not appropriate for viewing via the module fview for example.

This module is mainly called by the module flst_bilinear.




$ \bigcirc$See Also


flstb_dualchain, flst_bilinear, flstb_tv, ll_boundaries2, ll_boundaries, ll_edges, ll_extract.


$ \bigcirc$Version 1.0


Last Modification date : Thu Nov 29 20:23:56 2001


$ \bigcirc$Author


Pascal Monasse






next up previous contents index
Next: ll_distance Up: Reference Previous: fml_ml   Contents   Index
mw 2004-05-05