Image reading method capable of automatically adjusting image read conditions and image read apparatus adopting the method
AssigneeCanon Kabushiki Kaisha
InventorToru Nagata
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Abstract
An original image is pre-scanned, then scanning conditions to be used in main scanning are determined on the basis of obtained data in the pre-scanning. First, an original image is pre-scanned, and the obtained image signal is separated into color component signals. Thereafter, maximum values of the color component signals are detected for the respective colors. Further, the detected maximum values are analyzed to determine a type of the original image. After scanning conditions to be used in the main scanning are set on the basis of the type of the original image, the main scanning is performed.
Claims34
An image read method comprising:
- a pre-scanning step of pre-scanning a photographed image and outputting an image signal;
- a color separation step of separating the image signal obtained in said pre-scanning step into primary color component signals;
- a type determination step of determining a type of a light source which illuminated an object, in the photographed image, when it is photographed on the basis of signal levels of the color component signals obtained in said color separation step;
- and
- a condition determination step of determining scanning conditions for main scanning operation on the basis of the type of the light source determined in said type determination step.
An image read system comprising:
- image read means for scanning a photographed image and outputting an image signal;
- color separation means for separating the image signal obtained by said pre-scanning means into color component signals;
- type determination means for determining a type of a light source which illuminated an object, in the photographed image, when it is photographed on the basis of signal levels of the color component signals obtained by said color separation means;
- and
- condition determination means for determining scanning conditions for main scanning operation on the basis of the type of the light source determined by said type determination means.
Dependencies are inferred from the claim text.