Noise models for image processing
First Claim
1. A method comprising:
- determining a color temperature of a first pixel and a brightness of the first pixel, wherein the first pixel appears in a first image that was captured by an image sensor;
selecting a mapping between pixel brightness and noise deviation of the image sensor, wherein the noise deviation characterizes error in pixels that have the color temperature of the first pixel, wherein the error is introduced when the image sensor is capturing an image;
using the selected mapping to map at least the brightness of the first pixel to a particular noise deviation; and
based on the brightness of the first pixel, the particular noise deviation, and a brightness of a second pixel, determining whether to merge the first pixel and the second pixel, wherein the second pixel appears in a second image that was captured by the image sensor.
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Accused Products
Abstract
A plurality of images of a scene may be obtained. These images may have been captured by an image sensor, and may include a first image and a second image. A particular gain may have been applied to the first image. An effective color temperature and a brightness of a first pixel in the first image may be determined, and a mapping between pixel characteristics and noise deviation of the image sensor may be selected. The pixel characteristics may include pixel brightness. The selected mapping may be used to map at least the brightness of the first pixel to a particular noise deviation. The brightness of the first pixel and the particular noise deviation may be compared to a brightness of a second pixel of the second image. The comparison may be used to determine whether to merge the first pixel and the second pixel.
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Citations
20 Claims
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1. A method comprising:
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determining a color temperature of a first pixel and a brightness of the first pixel, wherein the first pixel appears in a first image that was captured by an image sensor; selecting a mapping between pixel brightness and noise deviation of the image sensor, wherein the noise deviation characterizes error in pixels that have the color temperature of the first pixel, wherein the error is introduced when the image sensor is capturing an image; using the selected mapping to map at least the brightness of the first pixel to a particular noise deviation; and based on the brightness of the first pixel, the particular noise deviation, and a brightness of a second pixel, determining whether to merge the first pixel and the second pixel, wherein the second pixel appears in a second image that was captured by the image sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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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determining a color temperature of a first pixel and a brightness of the first pixel, wherein the first pixel appears in a first image that was captured by an image sensor; selecting a mapping between pixel brightness and noise deviation of the image sensor, wherein the noise deviation characterizes error in pixels of the color temperature of the first pixel, wherein the error is introduced when the image sensor is capturing an image; using the selected mapping to map at least the brightness of the first pixel to a particular noise deviation; and based on the brightness of the first pixel, the particular noise deviation, and a brightness of a second pixel, determining whether to merge the first pixel and the second pixel, wherein the second pixel appears in a second image that was captured by the image sensor. - View Dependent Claims (17, 18, 19)
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20. A computing device comprising:
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one or more processors; memory; and program instructions, stored in the memory, that upon execution by the one or more processors cause the computing device to perform operations including; determining a color temperature of a first pixel and a brightness of the first pixel, wherein the first pixel appears in a first image that was captured by an image sensor; selecting a mapping between pixel brightness and noise deviation of the image sensor, wherein the noise deviation characterizes error in pixels of the color temperature of the first pixel, wherein the error is introduced when the image sensor is capturing an image; using the selected mapping to map at least the brightness of the first pixel to a particular noise deviation; and based on the brightness of the first pixel, the particular noise deviation, and a brightness of a second pixel, determining whether to merge the first pixel and the second pixel, wherein the second pixel appears in a second image that was captured by the image sensor.
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Specification