Phase detection autofocus using subaperture images
First Claim
1. A method for focusing a light-field camera, the method comprising:
- through an aperture of the light-field camera, receiving first light with a main lens of the light-field camera at a first focus setting;
directing the first light to a sensor of the light-field camera via an optical pathway;
in the sensor, capturing the first light to generate preliminary light-field data;
in a processor, using the preliminary light-field data to generate an offset;
using the offset to refocus the main lens to a second focus setting; and
wherein using the preliminary light-field data to generate the offset comprises;
using the preliminary light-field data to generate a plurality of subaperture images;
computing relative displacements between the subaperture images; and
based on the relative displacements, generating the offset using an averaging of a set of focus offsets.
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Accused Products
Abstract
A light-field camera may have enhanced autofocus functionality that does not require a dedicated optical pathway or dedicated sensors, and yet brings the camera rapidly into focus for image capture. According to one method, light may be received through the aperture of a light-field camera, with the main lens of the light-field camera at a first focus setting. The light may be directed to a sensor of the light-field camera via an optical pathway. The sensor may capture the light to generate preliminary light-field data. In a processor, the preliminary light-field data may be used to generate an offset, which may be used to refocus the main lens to a second focus setting. Additional light may be directed along the same optical pathway and captured with the main lens at the second focus setting to capture a focused light-field image.
498 Citations
16 Claims
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1. A method for focusing a light-field camera, the method comprising:
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through an aperture of the light-field camera, receiving first light with a main lens of the light-field camera at a first focus setting; directing the first light to a sensor of the light-field camera via an optical pathway; in the sensor, capturing the first light to generate preliminary light-field data; in a processor, using the preliminary light-field data to generate an offset; using the offset to refocus the main lens to a second focus setting; and wherein using the preliminary light-field data to generate the offset comprises; using the preliminary light-field data to generate a plurality of subaperture images; computing relative displacements between the subaperture images; and based on the relative displacements, generating the offset using an averaging of a set of focus offsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light-field camera comprising:
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an aperture configured to receive first light with a main lens of the light-field camera at a first focus setting such that the first light is directed to a sensor of the light-field camera via an optical pathway; a sensor configured to capture the first light to generate preliminary light-field data; and a processor configured to; use the preliminary light-field data to generate an offset; use the offset to cause the main lens to be refocused to a second focus setting; and wherein the processor is configured to use the preliminary light-field data to generate the offset by; using the preliminary light-field data to generate a plurality of subaperture images; computing relative displacements between the subaperture images; and based on the relative displacements, generating the offset using an averaging of a set of focus offsets. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification