发明名称 Half-tone image processing system.
摘要 <p>Image data processing circuitry is provided for processing image data items, representative of the respective density values of pixels making up an original image, to derive output data items for determining the density values or pixels making up a corresponding output image. The circuitry includes storage means (11) for storing successive sets of such image data items relating respectively to such original image pixels, each of which sets is made up of a data item relating to an object pixel (Dm,n) and further data items relating respectively to peripheral pixels, adjacent to the said object pixel; calculation means (12) operable to receive image data items of such a stored set and to produce a modified object pixel data item (D min m,n) derived from the said image data item relating to the said object pixel (Dm,n) of the set in dependence upon the respective differences in density values between that image data item (Dm,n) and the said further data items of the set concerned; comparison means (13) operable to compare the density value of the object pixel data item (D min _m,n) with a threstold value (TH1) and, in dependence upon the result of such comparison, to determine such an output data item (Om,n) corresponding to the object pixel concerned; and error correction means (14, 15) operable to determine an object pixel error (Em,n) representative of the difference in density values between the said modified object pixel item (D min m,n) and the said output data item (Om,n) and operable also, in dependence upon that error (Em,n), to modify such further data items in the said storage means (11) so as to enable the circuitry to compensable for such a determined object pixel error when processing a subsequent set of such image data items. Such circuitry can facilitate faithful reproduction of half-tone original images such as photography. &lt;IMAGE&gt;</p>
申请公布号 EP0454495(A1) 申请公布日期 1991.10.30
申请号 EP19910303820 申请日期 1991.04.26
申请人 FUJITSU LIMITED 发明人 ITOH, SEIICHI
分类号 G06T5/20;H04N1/405 主分类号 G06T5/20
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