Image scanning apparatus and method, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorMasatoshi Nagano
Life of this patent
Estimating the term…
Abstract
A scheme for obtaining an original image free from any dust or scratches on a film by scanning a film original or the like with visible light and infrared light has been proposed. This scheme suffers problems, i.e., a large memory size and long processing time since original image data obtained by infrared light must be stored. To solve such conventional problems, this invention provides, e.g., an image scanning apparatus which has a light source for emitting visible light and invisible light, scanning means for scanning an original image irradiated with light emitted by the light source, and control means for controlling the scanning means to scan the original image irradiated with the invisible light, and then to scan the original image irradiated with the visible light.
Claims28
An image scanning apparatus comprising:
- a light source adapted to emit visible light and invisible light;
- a scanning unit adapted to scan light emitted by said light source and transmitted through a transparent film original;
- and
- a controller adapted to control said light source and the scanning unit,
- wherein said light source and said scanning unit are arranged at opposite sides across the transparent film original, and an operation mode that skips a scan of the invisible light transmitted through the transparent film original to obtain information related to an abnormality on the transparent film original before or after executing a scan of the visible light transmitted through the transparent film original is selectable,
- when said scanning unit scans the visible light transmitted through the transparent film original, said scanning unit executes a rough scan for roughly scanning the visible light transmitted through the transparent film original, and a fine scan for scanning the original image under a required condition on the basis of information scanned in the rough scan, and said scanning unit makes the invisible light scan at a higher speed than the fine scan.
An image scanning method comprising:
- an emission step of emitting light by a light source adapted to emit visible light and invisible light;
- and
- a scanning step of scanning light emitted by said light source and transmitted through a transparent film original,
- wherein in the scanning step, an operation mode that skips a scan of the invisible light transmitted through the transparent film original to obtain information related to an abnormality on the transparent film original before or after executing a scan of the visible light transmitted through the transparent film original is selectable,
- in the scan of the visible light transmitted through the transparent film original, the scanning step executes a rough scan for roughly scanning the visible light transmitted through the transparent film original and a fine scan for scanning the original image under a required condition on the basis of information scanned in the rough scan, and the scanning step executes the invisible light scan at a higher speed than the fine scan.
A computer readable storage medium, which stores a program for implementing an image scanning method, said image scanning method comprising:
- an emission step of emitting light by a light source adapted to emit visible light and invisible light;
- and
- a scanning step of scanning light emitted by said light source and transmitted through a transparent film original,
- wherein in the scanning step, an operation mode that skips a scan of the invisible light transmitted through the transparent film original to obtain information related to an abnormality on the transparent film original before or after executing a scan of the visible light transmitted through the transparent film original is selectable,
- in the scan of the visible light transmitted through the transparent film original, the scanning step executes a rough scan for roughly scanning the visible light transmitted through the transparent film original and a fine scan for scanning the original image under a required condition on the basis of information scanned in the rough scan, and the scanning step executes the invisible light scan at a higher speed than the fine scan.
Dependencies are inferred from the claim text.