Tone mapping for low-light video frame enhancement
First Claim
Patent Images
1. A method of generating sharp, well-exposed, color images from low-light images, comprising:
- acquiring a series of under-exposed images;
computing a mean image based on an average of multiple images of the series of under-exposed images;
generating a sum image based on a sum of multiple images of the series of under-exposed images;
mapping chrominance variables of pixels of the mean image to chrominance variables of pixels of the sum image;
replacing chrominance values of pixels within the series of under-exposed images with chrominance values of the sum image; and
generating a set of sharp, well-exposed, color images based on the series of under-exposed images with replaced chrominance values.
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Abstract
A technique is provided for generating sharp, well-exposed, color images from low-light images. A series of under-exposed images is acquired. A mean image is computed and a sum image is generated each based on the series of under-exposed images. Chrominance variables of pixels of the mean image are mapped to chrominance variables of pixels of the sum image. Chrominance values of pixels within the series of under-exposed images are replaced with chrominance values of the sum image. A set of sharp, well-exposed, color images is generated based on the series of under-exposed images with replaced chrominance values.
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Citations
36 Claims
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1. A method of generating sharp, well-exposed, color images from low-light images, comprising:
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acquiring a series of under-exposed images; computing a mean image based on an average of multiple images of the series of under-exposed images; generating a sum image based on a sum of multiple images of the series of under-exposed images; mapping chrominance variables of pixels of the mean image to chrominance variables of pixels of the sum image; replacing chrominance values of pixels within the series of under-exposed images with chrominance values of the sum image; and generating a set of sharp, well-exposed, color images based on the series of under-exposed images with replaced chrominance values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A digital video acquisition device, comprising:
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a lens and an image sensor for capturing a stream of multiple digital video or still images; a processor; and a memory having processor-readable code embedded therein for programming the processor to perform a method of generating sharp, well-exposed, color images from under-exposed, low-light images, wherein the method comprises; acquiring a series of under-exposed images; computing a mean image based on an average of multiple images of the series of under-exposed images; generating a sum image based on a sum of multiple images of the series of under-exposed images; mapping chrominance variables of pixels of the mean image to chrominance variables of pixels of the sum image; replacing chrominance values of pixels within the series of under-exposed images with chrominance values of the sum image; and generating a set of sharp, well-exposed, color images based on the series of under-exposed images with replaced chrominance values. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. One or more non-transitory processor-readable media having processor-readable code embedded therein for programming one or more processors to perform a method of generating sharp, well-exposed, color images from under-exposed, low-light images, wherein the method comprises:
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acquiring a series of under-exposed images; computing a mean image based on an average of multiple images of the series of under-exposed images; generating a sum image based on a sum of multiple images of the series of under-exposed images; mapping chrominance variables of pixels of the mean image to chrominance variables of pixels of the sum image; replacing chrominance values of pixels within the series of under-exposed images with chrominance values of the sum image; and generating a set of sharp, well-exposed, color images based on the series of under-exposed images with replaced chrominance values. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification