Method of processing medium tone picture

Details Method of processing medium tone picture Method of processing medium tone picture

1981-12-29

1984-05-15

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358260, H04N 140

Patent

active

044491506

ABSTRACT:
Of a plurality of threshold matrices, one is selected at random for each predetermined number of picture elements of a medium tone picture which is the same as the number of threshold components of the matrix, or at a random time interval. The density levels of the respective picture elements are compared with the corresponding threshold components which constitute the selected matrix, whereby the density level of each output picture element is determined to be black level or white level.
The density level of each picture element of a medium tone picture is compared with a threshold value which is a random number generated by a random number generator, thereby determining the density level of an output picture element to be black level or white level. The difference or error in density level between a selected picture element or picture element in question to be compared with a random number and its output picture element is calculated. The resultant error is distributed and added to the density levels of other picture elements which neighbor the picture element in question and are to be processed subsequently, in accordance with specific distribution coefficients. This compensates the density level of each neighboring picture element and thereby avoids excessive dispersion of high frequency components in output pictures, which is critical to high quality picture reproduction.

REFERENCES:
patent: 4032978 (1977-06-01), Wong
patent: 4196452 (1980-04-01), Warren et al.
patent: 4196453 (1980-04-01), Warren
patent: 4245258 (1981-01-01), Holladay

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