| 摘要 |
An image reading device for a facsimile apparatus or the like compensates outputs of a line image sensor by shading while reading out a document. When a reference signal representative of a particular pixel is derived from a contaminated portion of a reference or white image, a reference signal representative of a pixel which immediately precedes that particular pixel is substituted for the latter. This promotes accurate shading which is free from the influence of contamination.
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