Bi-level halftone processing circuit and image processing appara

Details Bi-level halftone processing circuit and image processing appara Bi-level halftone processing circuit and image processing appara

1992-09-01

1994-04-26

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 52, 382 53, 358465, 358466, G06K 938, H04N 104, H04N 140

Patent

active

053074254

ABSTRACT:
An upper limit value and a lower limit value are used to modify the correction value computed in a correction value computing circuit in such a way that the correction value ranges between the upper and lower limit values. The threshold value computed from the upper and lower limit values is compared with the modified value to compute a binary value. The upper and lower limit values are selected to become those which the correction value may take. The correction value is obtainable in conformity with the density value resulting from converting the density value of an object pixel of an original image in terms of an exponential function or the approximate function of it.

REFERENCES:
patent: 4692811 (1987-09-01), Tsuchiya et al.
patent: 5121446 (1992-06-01), Yamada et al.

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