Image-capturing apparatus, image processing method and program product

An image-capturing apparatus comprising:

• an image-acquiring unit which successively acquires images that are captured by successively photographing a plurality of photographic subjects while the photographic subjects are being overlaid on an arbitrary place;
• a difference image producing unit which produces a difference image between each of the captured images that are acquired by the image-acquiring unit and the image which is captured immediately previously;
• a contour extraction unit which extracts contour information of the photographic subject, which is newly laid, from the difference image that is produced by the difference image producing unit;
• and
• an image conversion unit which corrects a distortion of the captured image on the basis of the contour information that is extracted by the contour extraction unit.

An image-capturing apparatus comprising:

• a difference image producing unit which produces a difference image between a captured image, which is acquired by photographing a photographic subject that is laid on an arbitrary place, and an image which is captured before the photographic subject is laid;
• a rectangle detection unit which detects a rectangular area on the basis of the difference image that is produced by the difference image producing unit;
• and
• an image conversion unit which clips an area corresponding to the rectangular area, which is detected by the rectangle detection unit, out of the captured image that is acquired by photographing the photographic subject laid on the arbitrary place, and corrects a distortion of a shape of the clipped image area.

An image processing method comprising:

• acquiring an image that is captured by photographing a photographic subject which is laid on an arbitrary place;
• producing a difference image between the captured image that is acquired and an image which is captured before the photographic subject is laid;
• extracting contour information of the photographic subject from the difference image that is produced;
• and
• correcting a distortion of the captured image on the basis of the contour information that is extracted.

An image processing method comprising:

• successively acquiring images that are captured by successively photographing a plurality of photographic subjects while the photographic subjects are being overlaid on an arbitrary place;
• producing a difference image between each of the captured images that are acquired and the image which is captured immediately previously;
• extracting contour information of the photographic subject, which is newly laid, from the difference image that is produced;
• and
• correcting a distortion of the captured image on the basis of the contour information that is extracted.

An image processing method comprising:

• producing a difference image between a captured image, which is acquired by photographing a photographic subject that is laid on an arbitrary place, and an image which is captured before the photographic subject is laid;
• detecting a rectangular area on the basis of the difference image that is produced;
• and
• clipping an area corresponding to the detected rectangular area out of the captured image that is acquired by photographing the photographic subject laid on the arbitrary place, and correcting a distortion of a shape of the clipped image area.

A program product recorded in a computer-readable recording medium and executed by a computer for controlling an image-capturing apparatus, the program product comprising:

• an image acquiring function of acquiring an image that is captured by photographing a photographic subject which is laid on an arbitrary place;
• a difference image producing function of producing a difference image between the captured image that is acquired by the image acquiring function and an image which is captured before the photographic subject is laid;
• a contour extracting function of extracting contour information of the photographic subject from the difference image that is produced by the difference image producing function;
• and
• an image converting function of correcting a distortion of the captured image on the basis of the contour information that is extracted by the contour extracting function.

A program product recorded in a computer-readable recording medium and executed by a computer for controlling an image-capturing apparatus, the program product comprising:

• an image acquiring function of successively acquiring images that are captured by successively photographing a plurality of photographic subjects while the photographic subjects are being overlaid on an arbitrary place;
• a difference image producing function of producing a difference image between each of the captured images that are acquired by the image acquiring function and the image which is captured immediately previously;
• a contour extracting function of extracting contour information of the photographic subject, which is newly laid, from the difference image that is produced by the difference image producing function;
• and
• an image converting function of correcting a distortion of the captured image on the basis of the contour information that is extracted by the contour extracting function.

A program product recorded in a computer-readable recording medium and executed by a computer for controlling an image-capturing apparatus, the program product comprising:

• a difference image producing function of producing a difference image between a captured image, which is acquired by photographing a photographic subject that is laid on an arbitrary place, and an image which is captured before the photographic subject is laid;
• a rectangle detection function of detecting a rectangular area on the basis of the difference image that is produced by the difference image producing function;
• and
• an image converting function of clipping an area corresponding to the rectangular area, which is detected by the rectangle detection function, out of the captured image that is acquired by photographing the photographic subject laid on the arbitrary place, and correcting a distortion of a shape of the clipped image area.