IMAGE PROCESSING APPARATUS

Abstract: an ss clock is obtained by modulating a reference clock with a spread spectrum of a predetermined modulation period. a data processing unit derives a weighted moving average value of a density fluctuation component at each pixel clock from a difference between a reference board reading value in a turning-off period of a lighting device and black reference data in synchronization with modulation of the ss clock, derives at each pixel clock an average value of the weighted moving average values in plural modulation periods, and corrects image data on the basis of the derived average value. the weighted moving average value of a target pixel clock is a weighted average of the density fluctuation components of the target and peripheral pixel clocks, and a weighting coefficient to the density fluctuation component of the target clock is larger than those of the peripheral clocks.

Inventor(s): Manabu Kitabayashi, Masayoshi Takahashi

CPC Classification: H04N1/00933 (Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof)

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