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Automatic white balance using infrared and/or ultraviolet signals

A technology of automatic white balance and confidence threshold, applied in color signal processing circuit, image communication, color TV components, etc., can solve problems such as misleading images and inaccuracies

Active Publication Date: 2020-04-28
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, skin or wood color tends to mislead AWB by estimating towards a lower color temperature and the resulting image may look incorrect (e.g. light blue instead of white)

Method used

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  • Automatic white balance using infrared and/or ultraviolet signals
  • Automatic white balance using infrared and/or ultraviolet signals
  • Automatic white balance using infrared and/or ultraviolet signals

Examples

Experimental program
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Embodiment Construction

[0024] According to aspects, embodiments discussed herein may provide an enhanced auto white balance (AWB) mechanism in which AWB is enhanced with infrared (IR) and / or ultraviolet (UV) light data. For example, instead of estimating illuminants using only Red Green Blue (RGB) values ​​from the image itself, the enhanced AWB mechanism can use IR and / or UV light data to provide additional information about the scene of the image, which can Aids in making the right decisions about the proper white balance for an image. The UV and / or IR light data may provide information about the type of illuminant associated with the image, such as whether it contains true daylight, incandescent, fluorescent, and / or visible light emitting diodes (LEDs).

[0025] Figure 1AIllustrated is a block diagram of a device 100 configured to enhance automatic white balance (AWB) with ultraviolet (UV) light data 106 and / or infrared (IR) light data 108 in accordance with aspects. For example, instead of usi...

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PUM

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Abstract

According to one aspect, an apparatus comprising: a camera configured to obtain an image; an electromagnetic radiation sensor configured to generate one of ultraviolet (UV) light data and infrared (IR) light data associated with the image at least one; a sensor processor configured to detect an illuminant type probability from probability data using at least one of the UV light data and the IR light data, wherein the illuminant type probability indication is associated with the image a level of confidence that the connected light source is a particular illuminant type; and an automatic white balance unit configured to adjust the automatic white balance using the illuminant type probability.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to and is a continuation of U.S. Nonprovisional Patent Application No. 14 / 885,377, filed October 16, 2015, entitled "AUTO WHITE BALANCE USING INFRARED AND / OR ULTRAVIOLETSIGNALS," the disclosure of which is incorporated by reference in its entirety. into this article. Background technique [0003] Automatic white balance (AWB) is a function that can be used to achieve color constancy under various illuminants for images captured by the camera sensor. Conventionally, an AWB can collect statistical samples from an input image and estimate illuminants by analyzing the statistical samples. However, this method can be misled by the colors in the input image. For example, a camera may detect a scene with only Red Green Blue (RGB) colors, but may not be able to determine the spectral distribution of the illuminant. Therefore, by using only the image itself, AWB can be misled by the detected RG...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/73H04N1/60
CPCH04N1/6027H04N1/6086H04N23/88
Inventor 洪嗣博
Owner GOOGLE LLC