Filter device comprising a recursive filter unit, method of filt

Details Filter device comprising a recursive filter unit, method of filt Filter device comprising a recursive filter unit, method of filt

1994-12-19

1996-10-22

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

36472417, H04B 110

Patent

active

055685242

ABSTRACT:
During filtering of an image having different regions, the operation of a filter unit is adapted in response to the detection of a boundary between these regions. To this end, one or more intermediate signal values stored in the filter unit for recursive use and derived from signal values from a first region are replaced before any signal value from the second region is filtered. The intermediate signal values are replaced by one or more signal values from the second region, or by filtered signal values derived from the signal values from the second region.

REFERENCES:
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patent: 4064530 (1977-12-01), Kaiser et al.
patent: 4803547 (1989-02-01), Stratton
patent: 5392315 (1995-02-01), Laud
"Multiple Model Recursive Estimation of Images" by V. K. Ingle and J. W. Woods, published in IEEE conference on Acoustics, Speech and Signal Processing 1979 (Washington DC) pp. 642 to 645 (notably Fig. 2).
"An Objective and Subjective Evaluation of Edge Detection Methods in Images" by J. Bernsen, Philips Journal of Research 1991, pp. 57-94.
"A Computational Approach to Edge Detection", by J. J. Canny, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-8, No. 6, pp. 679-698, Nov., 1986.
"Using Canny's Criteria to Derive a Recursively Implemented Optimal Edge Detector" by R. Deriche, International Journal of Computer Vision, pp. 167-187, 1987.
"Optimal Filter for Edge Detection Methods and Results" by S. Castan et al., Computer Vision ECCV 90, pp. 13-17, O. Faugeras ed., Springer Verlag, Berlin 1990.

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