Image processing system and method for employing adaptive scanni

Details Image processing system and method for employing adaptive scanni Image processing system and method for employing adaptive scanni

1992-04-17

1994-08-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358466, 358458, 358465, 382 50, 382 54, H04N 140

Patent

active

053412249

ABSTRACT:
An image processing system employs a scanner to generate an image having gray content from an input halftone image. The system further includes a programmed computer that determines whether each pixel is a constant area pixel or an edge area pixel. Each constant area pixel is detected to be a white pixel or a black pixel and the white or black value is set with reference to a local black or white reference point. The local reference point is then adjusted as a function of the input value of each constant area pixel. Each edge area pixel is detected to be a local-extremum pixel or a nonextremum pixel. The value of each local-extremum pixel is modified as a function of the current local reference point. The local reference point is also adjusted as a function of the value of each local-extremum or nonextremum pixel after it is detected. The modified constant and edge area pixels are stored as a modified image for output processing.

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