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Method of obtaining white reference data used for correcting non-uniformity in photoelectric cell array
| Details |
Inventors: Murakami, Shigeo;
Assignee: Dainippon Screen 303 1o. Ltd. (JP)
Primary Examiner: Boudreau; Leo H.
Assistant Examiner: Khanna; Rohini
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
In an image scan reader, a white reference plate is attached to a transparent plate on which an original is to be placed. Different regions are defined on the reference plate and respective optical densities on a plurality of scanning lines (L.sub.Al -L.sub.An, L.sub.Bl -L.sub.Bm) are detected and averaged within each region (R.sub.A, R.sub.B). The maximum averaged densities are selected for each given pixel position to be used for correcting the non-uniformity of CCD cells which are employed in reading the white reference plate and the image of the original. |
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DETAILED DESCRIPTION I claim: 1.
A method for obtaining white reference data for correcting therewith a non-uniformity in output signals of a linear photoelectric cell array, said method comprising the steps of; (1) providing a white reference plane which includes N regions arrayed in a first direction X, where N is an integer larger than one, (2) generating N averaged data through the steps of: (2a) selecting a J-th region within said N regions, where J is an integer satisfying 1.
ltoreq.
J.
ltoreq.
N, (2b) detecting, by means of said linear photoelectric cell array, a two dimensional distribution of optical densities in said J-th region and generating a J-th white density data expressing said two dimensional distribution, (2c) averaging said J-th white density data in said first direction X to generate a respective J-th averaged data for each different Y-coordinate value, where Y is a second direction perpendicular to said first direction X, and (2d) repeating the steps (2a) through (2c) while serially updating the integer J under the condition 1.
ltoreq.
J.
ltoreq.
N, to thereby generate said N averaged data, (3) comparing said Jth averaged data with (J+1)th averaged data and selecting the largest of said averaged data for each Y-coordinate value, whereby a plurality of selected maximum averaged data values are identified for respective Y-coordinate values, and (4) generating said white reference data in accordance with said plurality of said selected maximum average data values.
2.
The method of claim 1, wherein the step (2b) includes the steps of: (2b-1) detecting, by means of said linear cell array, a one dimensional distribution of optical densities in each of plural scanning lines which extend along said second direction Y and which are arrayed in said first direction X, to thereby generate a plurality of one-dimensional density data as said J-th white density data, and the step (2c) includes the steps of: (2c-1) averaging said plurality of said one-dimensional density data in said first direction X to generate said J-th averaged data
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Image Analysis 
