Image processing technique for reducing moire
AssigneeCanon Kabushiki Kaisha
InventorTakashi Akahane
Life of this patent
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Abstract
There is provided an image processing apparatus. A calculation unit calculates a difference in a signal level, for each area, between a first image obtained by shooting a subject under a first shooting condition and a second image obtained by shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition. A mixing unit mixes a signal level of the first image and a signal level of the second image at a ratio based on the difference, so as to generate a third image. The mixing unit sets a ratio of the second image when the difference is a first value, to be larger than a ratio of the second image when the difference is a second value that is smaller than the first value.
Claims14
An image processing apparatus comprising a processor and a memory, wherein the processor is configured to:
- calculate a difference in a signal level, for an area of interest including one or more pixels, between a first image obtained by shooting a subject under a first shooting condition and a second image obtained by shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition;
- and
- mix a signal level of the first image and a signal level of the second image at a mixing ratio based on the difference, so as to generate a third image,
- wherein the processor sets the mixing ratio such that a ratio of the second image to the first image when the difference is a first value is larger than a ratio of the second image to the first image when the difference is a second value that is smaller than the first value.
An image capturing apparatus comprising a processor and a memory, wherein the processor is configured to:
- control generation of a first image by controlling shooting a subject under a first shooting condition, and control generation of a second image by controlling shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition;
- calculate a difference in a signal level, for an area of interest including one or more pixels, between the first image and the second image;
- and
- mix a signal level of the first image and a signal level of the second image at a mixing ratio based on the difference, so as to generate a third image,
- wherein the processor sets the mixing ratio such that a ratio of the second image to the first image when the difference is a first value is larger than a ratio of the second image to the first image when the difference is a second value that is smaller than the first value.
An image processing method executed by an image processing apparatus, the image processing method comprising:
- calculating a difference in a signal level, for an area of interest including one or more pixels, between a first image obtained by shooting a subject under a first shooting condition and a second image obtained by shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition;
- and
- mixing a signal level of the first image and a signal level of the second image at a mixing ratio based on the difference, so as to generate a third image,
- wherein the mixing sets the mixing ratio such that a ratio of the second image to the first image when the difference is a first value is larger than a ratio of the second image to the first image when the difference is a second value that is smaller than the first value.
An image capturing method executed by an image capturing apparatus, the image capturing method comprising:
- generating a first image by shooting a subject under a first shooting condition, and generating a second image by shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition;
- calculating a difference in a signal level, for an area of interest including one or more pixels, between the first image and the second image;
- and
- mixing a signal level of the first image and a signal level of the second image at a mixing ratio based on the difference, so as to generate a third image,
- wherein the mixing sets the mixing ratio such that a ratio of the second image to the first image when the difference is a first value is larger than a ratio of the second image to the first image when the difference is a second value that is smaller than the first value.
A non-transitory computer-readable storage medium which stores a program for causing a computer to execute an image processing method comprising:
- calculating a difference in a signal level, for an area of interest including one or more pixels, between a first image obtained by shooting a subject under a first shooting condition and a second image obtained by shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition;
- and
- mixing a signal level of the first image and a signal level of the second image at a mixing ratio based on the difference, so as to generate a third image,
- wherein the mixing sets the mixing ratio such that a ratio of the second image to the first image when the difference is a first value is larger than a ratio of the second image to the first image when the difference is a second value that is smaller than the first value.
A non-transitory computer-readable storage medium which stores a program for causing a computer to execute an image capturing method comprising:
- generating a first image by shooting a subject under a first shooting condition, and generating a second image by shooting the subject under a second shooting condition in which high-frequency components of an optical image of the subject are reduced compared to the first shooting condition;
- calculating a difference in a signal level, for an area of interest including one or more pixels, between the first image and the second image;
- and
- mixing a signal level of the first image and a signal level of the second image at a mixing ratio based on the difference, so as to generate a third image,
- wherein the mixing sets the mixing ratio such that a ratio of the second image to the first image when the difference is a first value is larger than a ratio of the second image to the first image when the difference is a second value that is smaller than the first value.
Dependencies are inferred from the claim text.