Pixel interpolator with edge sharpening

Details Pixel interpolator with edge sharpening Pixel interpolator with edge sharpening

1989-11-16

1991-10-01

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 22, 382 54, 340728, G06K 900

Patent

active

050541005

ABSTRACT:
Methods and apparatus for interpolating existing gray-level pixel data to obtain new pixel values during image reduction and enlargement. A quadratic interpolation equation is used to apply location weighting factors to the density values of neighboring pixels. Edge strength modifying factors are used to modify the weighting factors in the x, y, and diagonal directions. In one embodiment, the modifying factors are set to greater than unity when the corresponding edge strength is greater than a predetermined threshold value. In another embodiment, the modifying factors are a non-linear function of the edge strength. These techniques preserve the sharpness of high contrast edges in the original image.

REFERENCES:
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patent: 4630307 (1986-12-01), Cok
patent: 4653013 (1987-03-01), Collins et al.
patent: 4783840 (1988-11-01), Song
patent: 4876610 (1989-10-01), Oshawa et al.
Smith, M. W. and Davis, W. A. "A New Algorithm for Edge Detection", Computer Graphics and Image Processing, No. 4, (1975) pp. 55-62.

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