Image pickup apparatus and control method thereof
AssigneeCanon Kabushiki Kaisha
InventorsMasafumi Kimura, Koichi Fukuda
Life of this patent
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Abstract
An image pickup apparatus for simultaneously realizing a phase difference AF and a contrast AF decides a shift amount of an image signal corresponding to a focus evaluation position every exit pupil area, generates an image corresponding to an image plane position by executing an arithmetic operation processing based on the decided shift amount to the image signal, calculates an evaluation value of a contrast of the generated image, and calculates an evaluation value of a correlation between the images corresponding to the different exit pupil areas in the generated image.
Claims13
An image pickup apparatus including an image pickup element for photoelectrically converting an optical image of an object which enters through a photographing lens and outputting an image signal, comprising:
- a pupil division unit configured to pupil-divide light from the photographing lens on a micro lens basis;
- a sensor having an output unit configured to output signals corresponding to charges divided by the pupil division unit;
- an image generation unit configured to generate an image corresponding to each of the image plane positions by changing outputs of the sensor to be subjected to synthesization on the basis of shift amounts of the signals corresponding to a plurality of image plane positions;
- and
- a contrast evaluation unit configured to calculate a contrast evaluation value of the image generated by the image generation unit.
An image pickup apparatus including an image pickup element for photoelectrically converting an optical image of an object which enters through a photographing lens and outputting an image signal, comprising:
- a pupil division unit configured to pupil-divide light from the photographing lens on a micro lens basis;
- a sensor having an output unit configured to output signals corresponding to charges divided by the pupil division unit;
- a detection unit for detecting a phase difference between images which pass through different pupil areas from a correlation between the images corresponding to different pupil areas obtained from the signal from the sensor;
- an image generation unit configured to generate an image corresponding to each of the image plane positions by changing outputs of the sensor to be subjected to synthesization on the basis of shift amounts of the signals corresponding to a plurality of image plane positions;
- and
- a contrast evaluation unit configured to calculate a contrast evaluation value of the image generated by the image generation unit on the basis of a detection result of the phase difference.
A control method of an image pickup apparatus including an image pickup element for photoelectrically converting an optical image of an object which enters through a photographing lens and outputting an image signal, comprising:
- a pupil division step of pupil-dividing light from the photographing lens on a micro lens basis;
- an output step of obtaining signals corresponding to charges divided by the pupil division step from a sensor;
- an image generation step of generating an image corresponding to each of the image plane positions by changing outputs of the sensor to be subjected to synthesization on the basis of shift amounts of the signals corresponding to a plurality of image plane positions;
- and
- a contrast evaluation step of calculating a contrast evaluation value of the image generated by the image generation step.
A control method of an image pickup apparatus including an image pickup element for photoelectrically converting an optical image of an object which enters through a photographing lens and outputting an image signal, comprising:
- a pupil division step of pupil-dividing light from the photographing lens on a micro lens basis;
- an output step of obtaining signals corresponding to charges divided by the pupil division step from a sensor;
- a detection step of detecting a phase difference between images which pass through different pupil areas from a correlation between the images corresponding to different pupil areas obtained from the signal from the sensor;
- an image generation step of generating an image corresponding to each of the image plane positions by changing outputs of the sensor to be subjected to synthesization on the basis of shift amounts of the signals corresponding to a plurality of image plane positions;
- and
- a contrast evaluation step of calculating a contrast evaluation value of the image generated by the image generation step on the basis of a detection result of the phase difference.
Dependencies are inferred from the claim text.