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White balance method in multi-exposure imaging system

A technology of multiple exposure and imaging systems, applied in the field of image processing, can solve the problems of inability to recognize ambient light sources, degraded image quality, discontinuous blocks, etc.

Active Publication Date: 2016-06-01
QUANTA COMPUTER INC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the above methods cannot identify ambient light sources
In addition, this method also needs to accurately determine the positions of bright and dark places. This step may easily lead to the generation of discontinuous blocks in the final image and reduce the image quality.

Method used

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  • White balance method in multi-exposure imaging system

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Embodiment Construction

[0024] In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below and described in detail with reference to the accompanying drawings.

[0025] figure 1 is a block diagram showing a multiple exposure imaging system 100 according to an embodiment of the present invention. Such as figure 1 As shown, the multiple exposure imaging system 100 includes an image capture unit 110 , a processor 120 , a memory unit 130 , a storage unit 140 , and a display unit 150 . The image capture unit 110 is used for capturing an image of a scene. The storage unit 140 stores program codes corresponding to various modules for image processing, such as a tone-mapping module, an autowhite-balance module, a saturation compensation module, a high dynamic range Imaging (highdynamic range imaging) module and so on. For example, the memory unit 130 is a volatile memory, such as a dynamic random ac...

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Abstract

A white-balance method for use in a multi-exposure imaging system having an image capturing unit is provided. The method includes the steps of: utilizing the image capturing unit to simultaneously capture a first image and a second image of a scene with a first exposure value and a second exposure value, respectively, wherein the second exposure value is smaller than the first exposure value, and the first exposure value and the second exposure value have individual exposure time and exposure gain; performing light source detection on the second image to obtain light source information and a corresponding light source color ratio of the scene; and performing a color gain process on the first image according to the light source color ratio to generate an output image.

Description

technical field [0001] The invention relates to image processing, in particular to a multiple exposure imaging system and a white balance method thereof. Background technique [0002] Color is a very important element in the image system. It not only allows users to accurately capture the color of objects, but also enhances the accuracy of other functions, such as object detection and recognition. However, variable light sources in the environment often affect the pixel color captured by the image system. For example, the same white paper will appear light blue under a light source with a high color temperature, and light yellow under a light source with a low color temperature. A good image system needs to exclude the influence of the light source and accurately restore the true color of the object. This function is autowhite-balance. In other words, the automatic white balance can identify the ambient light source and offset the influence of this light source on the color...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N9/73
CPCH04N23/741H04N23/88H04N23/71H04N23/80H04N25/583
Inventor 林耿生李宗德沙政亚
Owner QUANTA COMPUTER INC
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