发明名称 Method of and apparatus for establishing highlight and shadow densities.
摘要 <p>Highlight density (XH) (or shadow density) is established on the basis of a cumulative histogram (H(X)) of density in an original: First, reference densities (XHR, XHL and XH1 - XHn) associated with prescribed reference statistic values (YHR, YHL and YH1 - YHn), respectively, and threshold values (WH1 - WHn) are computed. Then, the reference density (XHR) is compared with a prescribed threshold density (XHS), and a difference ( DELTA XHi) concerning the reference density (XHi) is compared with the threshold value (WHi) in a procedure, to thereby select one of procedures for establishing the highlight density.</p>
申请公布号 EP0335419(A2) 申请公布日期 1989.10.04
申请号 EP19890105719 申请日期 1989.03.31
申请人 DAINIPPON SCREEN MFG. CO., LTD. 发明人 NOMURA, AKIHIRO DAINIPPON SCREEN MFG. CO., LTD.
分类号 G03F3/08;G06T5/00;H04N1/407 主分类号 G03F3/08
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