Tone mapping for low-light video frame enhancement
First Claim
Patent Images
1. An image processing method, comprising:
- acquiring a first well-exposed image frame of a scene;
acquiring additional image frames of the same scene;
wherein the additional image frames include a second image frame and a third image frame;
generating one or more combined images based on the well-exposed image frame of the scene and at least one of the additional image frames;
determining a frame-to-frame motion between the second image frame and the third image frame; and
responsive to said frame-to-frame motion exceeding a threshold, acquiring a second well-exposed image frame of the scene.
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Abstract
A technique is provided for generating sharp, well-exposed, color images front 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
25 Claims
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1. An image processing method, comprising:
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acquiring a first well-exposed image frame of a scene; acquiring additional image frames of the same scene; wherein the additional image frames include a second image frame and a third image frame; generating one or more combined images based on the well-exposed image frame of the scene and at least one of the additional image frames; determining a frame-to-frame motion between the second image frame and the third image frame; and responsive to said frame-to-frame motion exceeding a threshold, acquiring a second well-exposed image frame of the scene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image acquisition and processing device, comprising:
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an image acquisition unit configured to; acquiring a first well-exposed image frame of a scene; acquiring additional image frames of the same scene; wherein the additional image frames include a second image frame and a third image frame; an image combining unit configured to; generating one or more combined images based on the well-exposed image frame of the scene and at least one of the additional image frames; determining a frame-to-frame motion between the second image frame and the third image frame; and responsive to said frame-to-frame motion exceeding a threshold, acquiring a second well-exposed image frame of the scene. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A non-transitory computer readable storage medium storing one or more instructions which, when executed by a processor, cause the processor to perform:
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acquiring a first well-exposed image frame of a scene; acquiring additional image frames of the same scene; wherein the additional image frames include a second image frame and a third image frame; generating one or more combined images based on the well-exposed image frame of the scene and at least one of the additional image frames; determining a frame-to-frame motion between the second image frame and the third image frame; and responsive to said frame-to-frame motion exceeding a threshold, acquiring a second well-exposed image frame of the scene. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification