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US 2026/0270565 A1Published application
Image processing apparatus and method, image capturing apparatus, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorYUSUKE YAMASHITA
Life of this patent
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Abstract
A processing apparatus obtains pixel signals of a plurality of images by shooting a subject with different sensitivities by a sensor having a plurality of pixels; obtains a conversion ratio for converting the pixel signals of the plurality of images into pixel signals with a same sensitivity and a synthesis ratio for synthesizing the pixel signals of the plurality of images with the same sensitivity for each pixel; and performs dynamic range expansion synthesis for each pixel using the pixel signals of the plurality of images using the conversion ratio and the synthesis ratio. The synthesis ratio is obtained for each divided region obtained by dividing the plurality of pixels.
Claims19
A processing apparatus comprising at least one memory configured to store instructions;
- and at least one processor in communication with the at least one memory and configured to execute the instructions to:
- obtain pixel signals of a plurality of images by shooting a subject with a plurality of different charge accumulation periods by an image sensor having a plurality of pixels;
- set a conversion ratio according to differences among the plurality of different charge accumulation periods and a synthesis ratio for synthesizing the pixel signals of the plurality of images for each pixel;
- and
- perform dynamic range expansion synthesis for each pixel using the pixel signals of the plurality of images using the conversion ratio and the synthesis ratio,
- wherein the synthesis ratio is set to have a same value for each pixel in a divided region obtained by dividing the plurality of pixels,
- wherein the dynamic range expansion synthesis is performed after correcting a luminance level of a pixel signal of at least one image among the plurality of images according to the conversion ratio, and
- wherein the divided region includes at least two types of pixels corresponding to mutually different color components.
5 more elements
A capturing apparatus comprising
- a sensor;
- and
- a processing apparatus comprising at least one memory configured to store instructions;
- and at least one processor in communication with the at least one memory and configured to execute the instructions to:
- obtain pixel signals of a plurality of images by shooting a subject with a plurality of different charge accumulation periods by an image sensor having a plurality of pixels;
- set a conversion ratio according to differences among the plurality of different charge accumulation periods and a synthesis ratio for synthesizing the pixel signals of the plurality of images for each pixel;
- and
- perform dynamic range expansion synthesis for each pixel using the pixel signals of the plurality of images using the conversion ratio and the synthesis ratio,
- wherein the synthesis ratio is set to have a same value for each pixel in a divided region obtained by dividing the plurality of pixels,
- wherein the dynamic range expansion synthesis is performed after correcting a luminance level of a pixel signal of at least one image among the plurality of images according to the conversion ratio, and
- wherein the divided region includes at least two types of pixels corresponding to mutually different color components.
8 more elements
A method comprising:
- obtaining pixel signals of a plurality of images by shooting a subject with a plurality of different charge accumulation periods by an image sensor having a plurality of pixels;
- setting a conversion ratio according to differences among the plurality of different charge accumulation periods and a synthesis ratio for synthesizing the pixel signals of the plurality of images for each pixel;
- and
- perform dynamic range expansion synthesis for each pixel using the pixel signals of the plurality of images using the conversion ratio and the synthesis ratio,
- wherein the synthesis ratio is set to have a same value for each pixel in a divided region obtained by dividing the plurality of pixels,
- wherein the dynamic range expansion synthesis is performed after correcting a luminance level of a pixel signal of at least one image among the plurality of images according to the conversion ratio, and
- wherein the divided region includes at least two types of pixels corresponding to mutually different color components.
4 more elements
A non-transitory computer-readable storage medium, the storage medium storing a program that is executable by the computer, wherein the program includes program code for causing the computer to
- obtain pixel signals of a plurality of images by shooting a subject with a plurality of different charge accumulation periods by an image sensor having a plurality of pixels;
- set a conversion ratio according to differences among the plurality of different charge accumulation periods and a synthesis ratio for synthesizing the pixel signals of the plurality of images for each pixel;
- and
- perform dynamic range expansion synthesis for each pixel using the pixel signals of the plurality of images using the conversion ratio and the synthesis ratio,
- wherein the synthesis ratio is set to have a same value for each pixel in a divided region obtained by dividing the plurality of pixels,
- wherein the dynamic range expansion synthesis is performed after correcting a luminance level of a pixel signal of at least one image among the plurality of images according to the conversion ratio, and
- wherein the divided region includes at least two types of pixels corresponding to mutually different color components.
4 more elements
Dependencies are inferred from the claim text.