Three decision thresholding mode switch and method for mode sele

Details Three decision thresholding mode switch and method for mode sele Three decision thresholding mode switch and method for mode sele

1979-10-16

1981-02-17

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3401463AG, 358282, 358283, 358284, H04N 140

Patent

active

042518377

ABSTRACT:
A method for three decision mode selection of a thresholding algorithm is disclosed as is a thresholding mode switch having a three decision mode determining capability that is particularly useful for facsimile-copier devices in making printed copies of mixed format documents. The thresholding mode switch uses a reflectance difference algorithm for switching between a gray-scale thresholding algorithm and black-white thresholding algorithm to enhance the quality of prints made of mixed format documents presented for copying. A gradient constant is established for each picture element (pel) of the document then presented for copying and a determination is made at the thresholding mode switch as to which range, of three predetermined ranges, the gradient constant falls within, with this determination being then used to control the thresholding algorithm utilized in making that portion of the copy relating to that particular pel then being copied.

REFERENCES:
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patent: 3830967 (1974-08-01), Long
patent: 4047152 (1977-09-01), Giuliano
patent: 4119947 (1978-10-01), Leighton

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