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Method and device for automatically measuring ambient brightness

A technology for environmental brightness and automatic measurement, applied in the field of signal processing, can solve the problems of too simple environmental brightness grading, not considering the influence of image brightness of image acquisition equipment, etc., to achieve low cost and simple implementation.

Inactive Publication Date: 2010-07-07
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the method of estimating the ambient brightness through the camera is simply to roughly divide the ambient brightness into several grades according to the exposure time, without considering the influence of the image acquisition equipment on the image brightness, and the classification of the ambient brightness is also too simple

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  • Method and device for automatically measuring ambient brightness
  • Method and device for automatically measuring ambient brightness
  • Method and device for automatically measuring ambient brightness

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Embodiment Construction

[0017] Embodiments of the present invention provide a method and device for automatically measuring ambient brightness, which makes the implementation of determining ambient brightness simpler and requires lower costs.

[0018] The imaging devices mentioned in the embodiments of the present invention include cameras, digital cameras, video cameras and all other imaging devices that support automatic exposure. The embodiment of the present invention can measure the ambient brightness according to the exposure parameters of the imaging device without adding additional hardware.

[0019] Generally speaking, in order to adapt to ambient brightness and display images acceptable to human eyes under various environmental conditions, an imaging device will include an automatic exposure module. This module will adjust the exposure time (ET_Step) of the photosensitive device according to the difference in ambient brightness, so that images with image brightness and contrast within the a...

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Abstract

The invention discloses a method and a device for automatically measuring environment brightness, which is used to provide a technical scheme which is simple, has the low cost and determines the environment brightness. The method provided in the invention presets the first corresponding relations of exposure time range and environment brightness grade, and the method is that the environment brightness grade is determined according to the exposure time range to which the exposure time belongs and the corresponding relations.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for automatically measuring ambient brightness. Background technique [0002] With the development of information technology, cameras have been popularized in many multimedia devices. These devices often work in different environments. It is sometimes very useful to obtain the brightness information of the surrounding environment according to the camera information, such as changing the display device according to the brightness of the environment. (such as the display terminals of notebooks, desktop computers and mobile phones, etc.), thereby protecting people's eyesight while saving power. In addition, some special fields also require ambient brightness, such as some automatic doorbells or alarm devices that need to measure sudden changes in ambient brightness. [0003] In the prior art, ambient light brightness is generally measured by a special ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/52
Inventor 邓亚峰王浩黄英
Owner VIMICRO CORP