Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-10-02
1991-07-16
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 41, H04N 904
Patent
active
050329103
ABSTRACT:
Color fringing of edges between regions of different color in an interpolated image is effectively avoided by a signal processing technique that infers the existence of a color edge in response to prescribed changes in image characteristics at sample points for which data is available, and then interpolates intermediate values that are associated with a color edge using a linear equation. A first signal value, associated with a first band containing information of a first image characteristic (e.g. the green component) is fully sampled at a first spatial frequency, and a second signal value, associated with a second band containing information of a second characteristics (e.g. a red-green differential) is sampled at a second spatial frequency, lower than the first spatial frequency, so that interpolation of the second signal values is required. Differences between first sampled signal values, associated with sampling locations of the second sampled signal values, are measured. If the measured difference for successive fully sampled values is greater than a prescribed threshold value, the process infers the presence of an edge between these sample locations and proceeds to generate an interpolated second signal value, for a non-sampled location between the sampling locations for which the measurement was carried out, in accordance with a first predetermined relationship (a linear equation) between the first and second characteristics of the image. Otherwise, a linear proportional multiplier is employed.
REFERENCES:
patent: 4125856 (1978-11-01), Netravali et al.
Britton Howard W.
Dugas Edward
Eastman Kodak Company
Vu Kim Yen
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