Autofocus for stereo images
First Claim
Patent Images
1. A method in an electronic device for determining a focal depth for an image sensor, comprising:
- receiving a first image in the visible spectrum, the first image associated with a first viewpoint;
receiving a second image in the visible spectrum, the second image associated with a second viewpoint;
determining a first plurality of keypoints based on the first image;
correlating keypoints from the first plurality of keypoints with positions in the second image;
determining a plurality of disparities associated with each of the first plurality of keypoints to form a sparse depth map; and
determining a focal depth for capturing a third image in the visible spectrum based upon the sparse depth map, the position of the first viewpoint and the position of the second viewpoint.
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Abstract
Present embodiments contemplate systems, apparatus, and methods to determine an appropriate focal depth for a sensor based upon a pair of stereoscopic images. Particularly, certain of the embodiments contemplate determining keypoints for each image, identifying correlations between the keypoints, and deriving object distances from the correlations. These distances may then be used to select a proper focal depth for one or more sensors.
219 Citations
38 Claims
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1. A method in an electronic device for determining a focal depth for an image sensor, comprising:
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receiving a first image in the visible spectrum, the first image associated with a first viewpoint; receiving a second image in the visible spectrum, the second image associated with a second viewpoint; determining a first plurality of keypoints based on the first image; correlating keypoints from the first plurality of keypoints with positions in the second image; determining a plurality of disparities associated with each of the first plurality of keypoints to form a sparse depth map; and determining a focal depth for capturing a third image in the visible spectrum based upon the sparse depth map, the position of the first viewpoint and the position of the second viewpoint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer readable medium comprising instructions configured to cause a computer to perform the steps of:
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receiving a first image in the visible spectrum, the first image associated with a first viewpoint; receiving a second image in the visible spectrum, the second image associated with a second viewpoint; determining a first plurality of keypoints based on the first image; correlating keypoints from the first plurality of keypoints with positions in the second image; determining a plurality of disparities associated with each of the first plurality of keypoints to form a sparse depth map; and determining a focal depth for capturing a third image in the visible spectrum based upon the sparse depth map, the position of the first viewpoint and the position of the second viewpoint. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for focusing a stereoscopic capture device, the system comprising:
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a first image sensor configured to generate a first image in the visible spectrum, the first image associated with a first viewpoint; a second image sensor configured to generate a second image in the visible spectrum, the second image associated with a second viewpoint; a feature generation module configured to determine a first plurality of keypoints based on the first image; a keypoint correlation module configured to correlate keypoints from the first plurality of keypoints with positions in the second image; a disparity determination module configured to determine a plurality of disparities associated with each of the first plurality of keypoints to form a sparse depth map; and a depth determination module configured to determine a focal depth for capturing a third image in the visible spectrum based upon the sparse depth map, the position of the first viewpoint and the position of the second viewpoint. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system for focusing a stereoscopic capture device, the system comprising:
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means for receiving a first image in the visible spectrum, the first image associated with a first viewpoint; means for receiving a second image in the visible spectrum, the second image associated with a second viewpoint; means for determining a first plurality of keypoints based on the first image; means for correlating keypoints from the first plurality of keypoints with positions in the second image; means for determining a plurality of disparities associated with each of the first plurality of keypoints to form a sparse depth map; and means for determining a focal depth for capturing a third image in the visible spectrum based upon the sparse depth map, the position of the first viewpoint and the position of the second viewpoint. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification