Image analysis – Image transformation or preprocessing – Changing the image coordinates
Patent
1998-05-19
1999-03-30
Vu, Kim Yen
Image analysis
Image transformation or preprocessing
Changing the image coordinates
382264, 382279, 358448, G06K 940, G06K 15316, G06K 964, G06K 932
Patent
active
058898956
ABSTRACT:
A technique, referred to as area-based interpolation, performs image interpolation. The system determines a curve by the pixel value at a location by taking the integral of a curve over a small area, where the size of the area is determined by the sampling size of a sampling cell. When the image is resampled with respect to a sampling cell that has a finer spacing, the system integrates the polynomial using a finer integration area. In accordance with the invention, the relation between the reintegrated, resampled high resolution image and the low resolution image is a function of an up-sampler, followed by a linear filter. The coefficients of the filter are independent of the data, but are dependent on the family of curves used. If the system models by, for example, a third degree or fourth degree polynomial everywhere in the image, then that model determines the number of coefficients that are in the filter. Once the up-sampling factor and degree of the polynomial are determined, the filter coefficients are fixed, and can be calculated by solving a set of linear equations. It is not necessary to determine these values on an image-by-image basis. The system calculates the filter once and the consistency constraint is then satisfied for all image scaling.
REFERENCES:
patent: 5694316 (1997-12-01), Azancot
Herley Cormac
Wong Ping Wah
Hewlett--Packard Company
Vu Kim Yen
Williams Kimberly A.
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