Determining exposure times using split paxels
First Claim
Patent Images
1. A method comprising:
- capturing, by an image sensor, a plurality of images of a scene, wherein each image of the plurality of images is captured using a different total exposure time (TET);
downsampling the images in the plurality of images;
constructing a pixel value histogram based on pixel values of the downsampled images;
comparing the pixel value histogram to one or more reference pixel value histograms, wherein comparing the pixel value histogram to the one or more reference pixel value histograms comprises determining, for the pixel value histogram and each of the one or more reference pixel value histograms, respective similarity metrics, and determining respective weights based on the similarity metrics;
determining a payload TET based on comparing the pixel value histogram to the one or more reference pixel value histograms; and
capturing at least one additional image of the scene using the payload TET.
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Abstract
A plurality of images of a scene may be captured. Each image of the plurality of images may be captured using a different total exposure time (TET). The images in the plurality of images may be downsampled. A pixel value histogram based on pixel values of the downsampled images may be constructed. The pixel value histogram may be compared to one or more reference pixel value histograms. A payload TET may be determined based on comparing the pixel value histogram to the one or more reference pixel value histograms.
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Citations
20 Claims
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1. A method comprising:
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capturing, by an image sensor, a plurality of images of a scene, wherein each image of the plurality of images is captured using a different total exposure time (TET); downsampling the images in the plurality of images; constructing a pixel value histogram based on pixel values of the downsampled images; comparing the pixel value histogram to one or more reference pixel value histograms, wherein comparing the pixel value histogram to the one or more reference pixel value histograms comprises determining, for the pixel value histogram and each of the one or more reference pixel value histograms, respective similarity metrics, and determining respective weights based on the similarity metrics; determining a payload TET based on comparing the pixel value histogram to the one or more reference pixel value histograms; and capturing at least one additional image of the scene using the payload TET. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An article of manufacture including a non-transitory computer-readable medium, having stored thereon program instructions that, upon execution by a computing device, cause the computing device to perform operations comprising:
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capturing, by an image sensor, a plurality of images of a scene, wherein each image of the plurality of images is captured using a different total exposure time (TET); downsampling the images in the plurality of images; constructing a pixel value histogram based on pixel values of the downsampled images; comparing the pixel value histogram to one or more reference pixel value histograms, wherein comparing the pixel value histogram to the one or more reference pixel value histograms comprises determining, for the pixel value histogram and each of the one or more reference pixel value histograms, respective similarity metrics, and determining respective weights based on the similarity metrics; determining a payload TET based on comparing the pixel value histogram to the one or more reference pixel value histograms; and capturing at least one additional image of the scene using the payload TET. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A computing device comprising:
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at least one processor; an image sensor; data storage; and program instructions, stored in the data storage, that upon execution by the at least one processor cause the computing device to perform operations including; capturing, by the image sensor, a plurality of images of a scene, wherein each image of the plurality of images is captured using a different total exposure time (TET); downsampling the images in the plurality of images; constructing a pixel value histogram based on pixel values of the downsampled images; comparing the pixel value histogram to one or more reference pixel value histograms, wherein comparing the pixel value histogram to the one or more reference pixel value histograms comprises determining, for the pixel value histogram and each of the one or more reference pixel value histograms, respective similarity metrics, and determining respective weights based on the similarity metrics; determining a payload TET based on comparing the pixel value histogram to the one or more reference pixel value histograms; and capturing at least one additional image of the scene using the payload TET. - View Dependent Claims (19, 20)
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Specification