Title:
IMAGE INTERPOLATION AND DECIMATION USING A CONTINUOUSLY VARIABLE DELAY FILTER AND COMBINED WITH A POLYPHASE FILTER
Document Type and Number:
WIPO Patent Application WO2001052546
Kind Code:
A3
Abstract:
A filter structure is provided that facilitates the use of the filter as either a continuous delay Farrow filter or a selectable delay polyphase filter. The less complex polyphase filter is used when the desired scale substantially corresponds to a defined phase of the polyphase filter, or when time or power is not available to achieve the desired scale exactly; otherwise, the continuous delay Farrow filter is used. By providing an ability to switch to a continuous delay, the number of stages of the polyphase filter can be reduced. Additionally, an inversion of a Farrow filter is presented that provides for a continuous delay decimation filter with substantially reduced computational complexity compared to a direct embodiment of a Farrow filter. This inverted filter is also configurable as a polyphase filter, to provide selectable scale-resolution capabilities.
Inventors:
BOLAND LIZA G
JANSSEN JOHAN G
JANSSEN JOHAN G
Application Number:
PCT/EP2000/012922
Publication Date:
December 06, 2001
Filing Date:
December 18, 2000
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
H04N5/205; G06T3/40; G09G5/36; H03H17/00; H04N5/66; (IPC1-7): H03H17/02; H04N5/14
Foreign References:
| EP0327268A2 | 1989-08-09 | |||
| US5892695A | 1999-04-06 | |||
| EP0629044A1 | 1994-12-14 |
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