Image reading device, method and program using infrared...

Details Image reading device, method and program using infrared... Image reading device, method and program using infrared...

2005-12-27

2005-12-27

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C382S319000, C382S275000, C250S559020, C348S096000

Reexamination Certificate

active

06979834

ABSTRACT:
An image can be read during main scanning under an optimized image reading condition even if dust is attached to a document such as a photographic film or the like, or if there are scratches. A scanner irradiates visible light and infrared light from a light source, and an image of the document is separated into infrared and visible components. These components are detected for pixels of the image by an image sensor. A controller, e.g., of the scanner recognizes defective pixels based on the infrared component. Furthermore, the controller corrects a visible component level in the defective pixel based on the infrared component level of the defective pixel and a reference level obtained where there is no defect, in order to create a histogram. The controller determines image reading conditions such as, for example, an exposure amount (exposure time) for use during main scanning and an LUT gradation conversion characteristic based on this histogram.

REFERENCES:
patent: 4680638 (1987-07-01), Childs
patent: 5266805 (1993-11-01), Edgar
patent: 5969372 (1999-10-01), Stavely et al.

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