Image processing apparatus and image processing method

An image processing apparatus comprising:

• an interpolation unit configured to separate an image signal obtained from an image pickup device, in which a plurality of color filters are arranged in a predetermined pattern and in which pixels corresponding to the respective color filters are provided, into image signals of the respective color filters, and to perform an interpolation process by using the image signals of the respective color filters;
• a determination unit configured to determine whether a target region is a high-frequency region on the basis of at least any of slopes of image signals of a first color filter and a second color filter among the plurality of color filters and a difference between the image signals of the first color filter and the second color filter in the target region;
• an extraction unit configured to extract image signals having different cutoff frequencies from the image signal obtained from the image pickup device;
• and
• a processing unit configured to perform image processing if the target region is determined to be a high-frequency region by the determination unit, the image processing being different from image processing that is performed if the target region is not determined to be a high-frequency region,
• wherein pixels corresponding to the first color filter and the second color filter are arranged with an identical period and with a spatial phase difference, and
• wherein the processing unit generates and outputs a predetermined signal in the target region, and, if the target region is determined to be a high-frequency region by the determination unit, increases a weight of a predetermined signal generated from an image signal having a cutoff frequency lower than in a case where the target region is not determined to be a high-frequency region, and combines predetermined signals generated from the image signals having different cutoff frequencies to output a resulted signal.

An image processing method comprising:

• an interpolation step of separating an image signal obtained from an image pickup device, in which a plurality of color filters are arranged in a predetermined pattern and in which pixels corresponding to the respective color filters are provided, into image signals of the respective color filters, and performing interpolation by using the image signals of the respective color filters;
• a determination step of determining whether a target region is a high-frequency region on the basis of at least any of slopes of image signals of a first color filter and a second color filter among the plurality of color filters and a difference between the image signals of the first color filter and the second color filter in the target region;
• an extraction step of extracting image signals having different cutoff frequencies from the image signal obtained from the image pickup device;
• and
• a processing step of performing image processing if the target region is determined to be a high-frequency region in the determination step, the image processing being different from image processing that is performed if the target region is not determined to be a high-frequency region,
• wherein pixels corresponding to the first color filter and the second color filter are arranged with an identical period and with a spatial phase difference, and
• wherein the processing step generates and outputs a predetermined signal in the target region, and, if the target region is determined to be a high-frequency region in the determination step, outputs a predetermined signal generated from an image signal having a cutoff frequency lower than in a case where the target region is not determined to be a high-frequency region.

An image processing method comprising:

• an interpolation step of separating an image signal obtained from an image pickup device, in which a plurality of color filters are arranged in a predetermined pattern and in which pixels corresponding to the respective color filters are provided, into image signals of the respective color filters, and performing interpolation by using the image signals of the respective color filters;
• a determination step of determining whether a target region is a high-frequency region on the basis of at least any of slopes of image signals of a first color filter and a second color filter among the plurality of color filters and a difference between the image signals of the first color filter and the second color filter in the target region;
• an extraction step of extracting image signals having different cutoff frequencies from the image signal obtained from the image pickup device;
• and
• a processing step of performing image processing if the target region is determined to be a high-frequency region in the determination step, the image processing being different from image processing that is performed if the target region is not determined to be a high-frequency region,
• wherein pixels corresponding to the first color filter and the second color filter are arranged with an identical period and with a spatial phase difference, and
• wherein the processing step generates and outputs a predetermined signal in the target region, and, if the target region is determined to be a high-frequency region in the determination step, increases a weight of a predetermined signal generated from an image signal having a cutoff frequency lower than in a case where the target region is not determined to be a high-frequency region, and combines predetermined signals generated from the image signals having different cutoff frequencies to output a resulted signal.