Chromatic aberration correction apparatus, image pickup apparatus, chromatic aberration amount calculation method, and chromatic aberration amount calculation program

A chromatic aberration correction apparatus that identifies a purple area part of an image on the basis of chrominance signals of image data and further identifies white overexposure pixels each of which has a luminance value indicating saturation on the basis of a luminance signal of the image data so as to perform chromatic aberration correction while regarding a purple area part that appears in the periphery of a white overexposure pixel as an area part affected by chromatic aberration, the chromatic aberration correction apparatus comprising:

• a white overexposure information temporary retaining section that temporarily stores the result of a white overexposure judgment made for each pixel;
• and
• a chromatic aberration amount calculating section that calculates chromatic aberration amount for each of pixels that make up an image with the use of white overexposure pixel distribution information supplied from the white overexposure information temporary retaining section, the white overexposure pixel distribution information indicating the distribution of the identified white overexposure pixels, and further with the use of chromatic aberration amount distribution information, which indicates the distribution of chromatic aberration amount for each of pixels located in a certain area that is determined when the above-mentioned each of pixels that make up an image is selected as a judgment-target pixel one by one, the chromatic aberration amount distribution information having been set for the above-mentioned each of pixels that make up an image in advance,
• the chromatic aberration amount calculating section including
• a white overexposure distribution information memory that holds the white overexposure pixel distribution information,
• a chromatic aberration distribution information memory that holds the chromatic aberration amount distribution information,
• a chromatic aberration amount memory that stores chromatic aberration amount for the above-mentioned each of pixels that make up an image,
• a judgment unit that judges whether a selected pixel of interest is a white overexposure pixel or not on the basis of the white overexposure pixel distribution information that is held in the white overexposure distribution information memory, a white overexposure pixel judgment being made for the above-mentioned each of pixels that make up an image,
• a reader that reads, for each selected pixel of interest that is judged as a white overexposure pixel by the judgment unit, the chromatic aberration amount distribution information for a certain area that is determined on the basis of the selected pixel of interest out of the chromatic aberration distribution information memory, and
• an adder that stamps the entire chromatic aberration amount distribution information that is read by the reader on the corresponding storage area of the chromatic aberration amount memory through addition processing.

An image pickup apparatus comprising:

• an image pickup device;
• a lens for forming an image of an object of shooting on the imaging surface of the image pickup device;
• and
• a chromatic aberration correcting section that identifies a purple area part of an image on the basis of chrominance signals of image data that is acquired through the image pickup device and further identifies white overexposure pixels each of which has a luminance value indicating saturation on the basis of a luminance signal of the image data so as to perform chromatic aberration correction while regarding a purple area part that appears in the periphery of a white overexposure pixel as an area part affected by chromatic aberration,
• the chromatic aberration correcting section including
• a white overexposure information temporary retaining section that temporarily stores the result of a white overexposure judgment made for each pixel, and
• a chromatic aberration amount calculating section that calculates chromatic aberration amount for each of pixels that make up an image with the use of white overexposure pixel distribution information, which indicates the distribution of the identified white overexposure pixels, and further with the use of chromatic aberration amount distribution information, which indicates the distribution of chromatic aberration amount for each of pixels located in a certain area that is determined when the above-mentioned each of pixels that make up an image is selected as a judgment-target pixel one by one, the chromatic aberration amount distribution information having been set for the above-mentioned each of pixels that make up an image in advance,
• the chromatic aberration amount calculating section including
• a white overexposure distribution information memory that holds the white overexposure pixel distribution information,
• a chromatic aberration distribution information memory that holds the chromatic aberration amount distribution information,
• a chromatic aberration amount memory that stores chromatic aberration amount for the above-mentioned each of pixels that make up an image,
• a judgment unit that judges whether a selected pixel of interest is a white overexposure pixel or not on the basis of the white overexposure pixel distribution information that is held in the white overexposure distribution information memory, a white overexposure pixel judgment being made for the above-mentioned each of pixels that make up an image,
• a reader that reads, for each selected pixel of interest that is judged as a white overexposure pixel by the judgment unit, the chromatic aberration amount distribution information for a certain area that is determined on the basis of the selected pixel of interest out of the chromatic aberration distribution information memory, and
• an adder that adds each chromatic aberration amount contained in the chromatic aberration amount distribution information that is read by the reader to a value of the corresponding position in the storage area of the chromatic aberration amount memory.

A chromatic aberration amount calculation method that is used by a chromatic aberration correction apparatus that identifies a purple area part of an image on the basis of chrominance signals of image data and further identifies white overexposure pixels each of which has a luminance value indicating saturation on the basis of a luminance signal of the image data so as to perform chromatic aberration correction while regarding a purple area part that appears in the periphery of a white overexposure pixel as an area part affected by chromatic aberration, the chromatic aberration correction apparatus having a white overexposure information temporary retaining section that temporarily stores the result of a white overexposure judgment made for each pixel and a chromatic aberration amount calculating section that calculates chromatic aberration amount for each of pixels that make up an image with the use of white overexposure pixel distribution information supplied from the white overexposure information temporary retaining section, the white overexposure pixel distribution information indicating the distribution of the identified white overexposure pixels, and further with the use of chromatic aberration amount distribution information, which indicates the distribution of chromatic aberration amount for each of pixels located in a certain area that is determined when the above-mentioned each of pixels that make up an image is selected as a judgment-target pixel one by one, the chromatic aberration amount distribution information having been set for the above-mentioned each of pixels that make up an image in advance, the chromatic aberration amount calculating section of the chromatic aberration correction apparatus including a white overexposure distribution information memorizing means for holding the white overexposure pixel distribution information, a chromatic aberration distribution information memorizing means for holding the chromatic aberration amount distribution information, a chromatic aberration amount storing means for storing chromatic aberration amount for the above-mentioned each of pixels that make up an image, a judging means for judging whether a judgment-target pixel is a white overexposure pixel or not, a reading means for reading the chromatic aberration amount distribution information out of the chromatic aberration distribution information memorizing means, and an adding means that performs chromatic aberration amount addition processing, the chromatic aberration amount calculation method performed by the chromatic aberration amount calculating section of the chromatic aberration correction apparatus comprising the steps of:

• judging, by the judging means, whether a selected pixel of interest is a white overexposure pixel or not on the basis of the white overexposure pixel distribution information that is held in the white overexposure distribution information memorizing means, a white overexposure pixel judgment being made for the above-mentioned each of pixels that make up an image;
• reading, by the reading means, for each selected pixel of interest that is judged as a white overexposure pixel in the judgment operation performed by the judging means, the chromatic aberration amount distribution information for a certain area that is determined on the basis of the selected pixel of interest out of the chromatic aberration distribution information memorizing means;
• and
• adding, by the adding means, each chromatic aberration amount contained in the chromatic aberration amount distribution information that is read in the readout operation performed by the reading means to a value of the corresponding position in the storage area of the chromatic aberration amount storing means.

A chromatic aberration amount calculation program that is executed by a computer mounted on an image pickup apparatus for, when chromatic aberration correction is performed while regarding a purple area part that appears in the periphery of a white overexposure pixel as an area part affected by chromatic aberration by identifying a purple area part of an image on the basis of chrominance signals of image data and further by identifying white overexposure pixels each of which has a luminance value indicating saturation on the basis of a luminance signal of the image data, calculating chromatic aberration amount for each of pixels that make up an image with the use of white overexposure pixel distribution information that indicates the distribution of the identified white overexposure pixels, and further with the use of chromatic aberration amount distribution information, which indicates the distribution of chromatic aberration amount for each of pixels located in a certain area that is determined when the above-mentioned each of pixels that make up an image is selected as a judgment-target pixel one by one, the chromatic aberration amount distribution information having been set for the above-mentioned each of pixels that make up an image in advance, the image pickup apparatus including a white overexposure distribution information memorizing means for holding the white overexposure pixel distribution information, a chromatic aberration distribution information memorizing means for holding the chromatic aberration amount distribution information, a chromatic aberration amount storing means for storing chromatic aberration amount for the above-mentioned each of pixels that make up an image, a judging means for judging whether a judgment-target pixel is a white overexposure pixel or not, a reading means for reading the chromatic aberration amount distribution information out of the chromatic aberration distribution information memorizing means, and an adding means that performs chromatic aberration amount addition processing, the computer mounted on the image pickup apparatus executing the steps of:

• judging, by the judging means, whether a selected pixel of interest is a white overexposure pixel or not on the basis of the white overexposure pixel distribution information that is held in the white overexposure distribution information memorizing means, a white overexposure pixel judgment being made for the above-mentioned each of pixels that make up an image;
• reading, by the reading means, for each selected pixel of interest that is judged as a white overexposure pixel in the judgment operation performed by the judging means, the chromatic aberration amount distribution information for a certain area that is determined on the basis of the selected pixel of interest out of the chromatic aberration distribution information memorizing means;
• and
• adding, by the adding means, each chromatic aberration amount contained in the chromatic aberration amount distribution information that is read in the readout operation performed by the reading means to a value of the corresponding position in the storage area of the chromatic aberration amount storing means.

A chromatic aberration correction apparatus that identifies a purple area part of an image on the basis of chrominance signals of image data and further identifies white overexposure pixels each of which has a luminance value indicating saturation on the basis of a luminance signal of the image data so as to perform chromatic aberration correction while regarding a purple area part that appears in the periphery of a white overexposure pixel as an area part affected by chromatic aberration, the chromatic aberration correction apparatus comprising:

• a white overexposure information temporary retaining section that temporarily stores the result of a white overexposure judgment made for each pixel;
• and
• a chromatic aberration amount calculating section that calculates chromatic aberration amount for each of pixels that make up an image with the use of white overexposure pixel distribution information supplied from the white overexposure information temporary retaining section, the white overexposure pixel distribution information indicating the distribution of the identified white overexposure pixels, and further with the use of chromatic aberration amount distribution information, which indicates the distribution of chromatic aberration amount for each of pixels located in a certain area that is determined when the above-mentioned each of pixels that make up an image is selected as a judgment-target pixel one by one, the chromatic aberration amount distribution information having been set for the above-mentioned each of pixels that make up an image in advance,
• the chromatic aberration amount calculating section including
• a white overexposure distribution information memorizing means for holding the white overexposure pixel distribution information,
• a chromatic aberration distribution information memorizing means for holding the chromatic aberration amount distribution information,
• a chromatic aberration amount storing means for storing chromatic aberration amount for the above-mentioned each of pixels that make up an image,
• a judging means for judging whether a selected pixel of interest is a white overexposure pixel or not on the basis of the white overexposure pixel distribution information that is held in the white overexposure distribution information memorizing means, a white overexposure pixel judgment being made for the above-mentioned each of pixels that make up an image,
• a reading means for reading, for each selected pixel of interest that is judged as a white overexposure pixel by the judging means, the chromatic aberration amount distribution information for a certain area that is determined on the basis of the selected pixel of interest out of the chromatic aberration distribution information memorizing means, and
• an adding means that adds each chromatic aberration amount contained in the chromatic aberration amount distribution information that is read by the reading means to a value of the corresponding position in the storage area of the chromatic aberration amount storing means.

An image pickup apparatus comprising:

• an image pickup device;
• a lens for forming an image of an object of shooting on the imaging surface of the image pickup device;
• and
• a chromatic aberration correcting section that identifies a purple area part of an image on the basis of chrominance signals of image data that is acquired through the image pickup device and further identifies white overexposure pixels each of which has a luminance value indicating saturation on the basis of a luminance signal of the image data so as to perform chromatic aberration correction while regarding a purple area part that appears in the periphery of a white overexposure pixel as an area part affected by chromatic aberration,
• the chromatic aberration correcting section including
• a white overexposure information temporary retaining section that temporarily stores the result of a white overexposure judgment made for each pixel, and
• a chromatic aberration amount calculating section that calculates chromatic aberration amount for each of pixels that make up an image with the use of white overexposure pixel distribution information, which indicates the distribution of the identified white overexposure pixels, and further with the use of chromatic aberration amount distribution information, which indicates the distribution of chromatic aberration amount for each of pixels located in a certain area that is determined when the above-mentioned each of pixels that make up an image is selected as a judgment-target pixel one by one, the chromatic aberration amount distribution information having been set for the above-mentioned each of pixels that make up an image in advance,
• the chromatic aberration amount calculating section including
• a white overexposure distribution information memorizing means for holding the white overexposure pixel distribution information,
• a chromatic aberration distribution information memorizing means for holding the chromatic aberration amount distribution information,
• a chromatic aberration amount storing means for storing chromatic aberration amount for the above-mentioned each of pixels that make up an image,
• a judging means for judging whether a selected pixel of interest is a white overexposure pixel or not on the basis of the white overexposure pixel distribution information that is held in the white overexposure distribution information memorizing means, a white overexposure pixel judgment being made for the above-mentioned each of pixels that make up an image,
• a reading means for reading, for each selected pixel of interest that is judged as a white overexposure pixel by the judging means, the chromatic aberration amount distribution information for a certain area that is determined on the basis of the selected pixel of interest out of the chromatic aberration distribution information memorizing means, and
• an adding means for adding each chromatic aberration amount contained in the chromatic aberration amount distribution information that is read by the reading means to a value of the corresponding position in the storage area of the chromatic aberration amount storing means.