Dual reference blacklevel clamping device and method for video l

Details Dual reference blacklevel clamping device and method for video l Dual reference blacklevel clamping device and method for video l

1998-04-30

2000-02-29

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 4, H05G 164

Patent

active

060318910

ABSTRACT:
A medical diagnostic imaging device (A) compensates for non-uniform line correlated noise generated in an image receptor (26). The image receptor receives x-rays transmitted from an x-ray source (12) and generates a raster line of image data. The image receptor includes an active area (30), a first reference zone (32) bounded on a first side of the active area, and a second reference zone (34) bounded on a second side of the active area opposite to the first side. The reference zones prevent image information from being received by corresponding pixels of the raster line. The outputs of a first plurality of raster line pixels corresponding to the first reference zone (32) are averaged, and the outputs of a second plurality of raster line pixels corresponding to the second reference zone (34) are averaged. An interpolated offset value for each raster line pixel is determined based on i) the average output values of the first plurality and second plurality of raster line pixels, and ii) the location of the pixel within the raster line. The output value of the raster line pixel is modified based on the interpolated offset value calculated.

REFERENCES:
patent: 5528043 (1996-06-01), Spivey et al.

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