Image processing device, image processing program, and imaging device

An image processing device comprising:

• an image input unit into which a photographed image is inputted;
• and
• a determination unit using a brightness information corresponding to a brightness of a detection region within the photographed image, and a saturation information corresponding to a saturation of the detection region to make a determination regarding whether or not the detection region is a portion corresponding to a foreign object shown in the photographed image, wherein
• after the determination unit uses the brightness information to determine whether or not the detection region is a portion corresponding to the foreign object, the determination unit uses the saturation information to make a determination regarding whether or not the detection region is a portion corresponding to the foreign object.

An image processing program making a computer execute the steps comprising:

• a step computing a first brightness value representing a brightness of each portion within an image, and a second brightness value representing a brightness of an area surrounding the each portion;
• a step computing a first color phase value representing a color phase within a region and a second color phase value representing a color phase of an area surrounding the region;
• and
• a step extracting a region comprising the each portion such that a difference between the first brightness value and the second brightness value is greater than or equal to a predetermined threshold value, and a difference between the first color phase value and the second color phase value is not greater than or equal to a predetermined threshold value.

An imaging device comprising:

• an imaging unit capturing an image;
• a brightness computation unit computing a first brightness value representing a brightness of each portion within the image captured by the imaging unit and a second brightness value representing a brightness of an area surrounding the each portion;
• a color phase value computation unit computing a first color phase value representing a color phase of the each portion and a second color phase value representing a color phase of an area surrounding the each portion;
• and
• a region extraction unit extracting a region comprising the each portion such that a difference between the first brightness value and the second brightness value is greater than or equal to a predetermined threshold value, and a difference between the first color phase value and the second color phase value is not greater than or equal to a predetermined threshold value.

An image processing program making a computer execute the steps comprising:

• a step computing a brilliance gradient within an image based on an image information;
• a step computing a first color phase value and a second color phase value, the first color phase value representing a color phase inside a candidate region determined based on the brilliance gradient being computed, the second color phase value representing a color phase in an area surrounding the candidate region;
• and
• a step extracting a region from the candidate region such that a difference between the first color phase value and the second color phase value is less than or equal to a predetermined threshold value.

An imaging device comprising:

• an imaging unit capturing an image and generating an image information;
• a brilliance gradient computation unit computing a brilliance gradient within an image based on the image information;
• a color phase value computation unit computing a first color phase value and a second color phase value, the first color phase value representing a color phase inside a candidate region determined based on the brilliance gradient computed by the brilliance gradient computation unit, the second color phase value representing a color phase in an area surrounding the candidate region;
• and
• a region extraction unit extracting a region from the candidate region such that a difference between the first color phase value and the second color phase value is less than or equal to a predetermined threshold value.

A program making a computer execute the steps comprising:

• a step inputting a captured image;
• a step computing a brightness information of the captured image;
• a step computing a saturation information of the captured image;
• and
• a step using the brightness information and the saturation information to detect a foreign object information regarding a foreign object shown in the captured image.

An imaging device comprising:

• an imaging unit capturing an image of an optical system and outputting a captured image;
• an image conversion unit outputting an image obtained by processing the captured image with a non-linear correction;
• and
• a correction unit performing a first correction and a second correction, the first correction performed by using a brightness information corresponding to a brightness of the image and reducing an influence of a foreign object shown in the image with respect to a portion corresponding to the foreign object, and the second correction performed by using at least one of a saturation information corresponding to a saturation of the image and a color phase information corresponding to a color phase of the image and reducing an influence of a foreign object shown in the image with respect to a portion corresponding to the foreign object.