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.
Claims20
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 different sensitivities by a sensor having a plurality of pixels;
- obtain 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
- 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 obtained for each divided region obtained by dividing the plurality of pixels.
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 different sensitivities by the sensor having a plurality of pixels;
- obtain 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
- 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 obtained for each divided region obtained by dividing the plurality of pixels.
A method comprising:
- obtaining pixel signals of a plurality of images by shooting a subject with different sensitivities by a sensor having a plurality of pixels;
- obtaining 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
- 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 obtained for each divided region obtained by dividing the plurality of pixels.
A method comprising:
- obtaining pixel signals of a plurality of images by shooting a subject with different sensitivities by a sensor having a plurality of pixels;
- obtaining a conversion ratio for converting the pixel signals of the plurality of images into pixel signals with a same sensitivity;
- determining, for each divided region, whether a luminance difference between a maximum luminance and a minimum luminance of luminances of the pixel signals whose sensitivities are matched using the conversion ratio is equal to or greater than a predetermined threshold,
- obtaining a synthesis ratio for synthesizing the pixel signals of the plurality of images with the same sensitivity 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, in a case where the luminance difference is equal to or greater than the threshold, the synthesis ratio is obtained for the divided region, and in a case where the luminance difference is less than the threshold, the synthesis ration is obtained for each pixel.
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 different sensitivities by a sensor having a plurality of pixels;
- obtain 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
- 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 obtained for each divided region obtained by dividing the plurality of pixels.
Dependencies are inferred from the claim text.