The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 1994
Filed:
Sep. 30, 1992
Takashi Sakamoto, Kamikyo, JP;
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Abstract
The present invention produces halftone dots which shows small fluctuations in area irrespective of variation of the relative position of the address range of screen pattern data against the pixels. a plurality of exposure-decision points RC, SP1, SP2, and SP3 are set for each pixel RP. Screen pattern data is compared with an image signal at each of the exposure-decision points, and the results of comparison are output as preliminary decision value. The preliminary decision value is summed up to make total value Tex for each pixel, and the total value Tex is further accumulated in a primary scanning direction U to make total-sum value .SIGMA.Tex. When the total-sum value .SIGMA.Tex for a pixel is equal to or greater than the number of exposure-decision points, the pixel is determined to be exposed, and carry-over data Dco, which is obtained by subtracting the number of the exposure-decision points from the total-sum value .SIGMA.Tex, is transferred to the next pixel. When the total-sum value .SIGMA.Tex for a pixel is less than the number of the exposure-decision points, the pixel is determined not to be exposed, and the total-sum value .SIGMA.Tex is transferred to the next pixel as the carry-over data Dco.