| 摘要 |
A multiple value image input device corrects image data representing images from a document by scanning density indicating segments arranged along the main scanning direction of linear image sensor, each of the segments being set at a different optical density, and using the values obtained by such scanning to correct image data obtained by subsequent scanning of the document. The correction generally involves finding at least two values of the correction image data for each value of the image data, and applying to each value of the image data a function determined from the selected correction image data values. Further correction can be accomplished by scanning subsidiary density indicating segments and further correcting the image data based on results of scanning the second density reference area.
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