Automatic exposure method and device for LED white-light source

A technology of automatic exposure and white light, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of large impact on video quality and poor video quality, and achieve the effect of accurate control accuracy

Active Publication Date: 2014-08-06
SHENZHEN INFINOVA
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Due to the specific wavelength and lighting characteristics of white LED lights, and the automatic gain has a great impact on video quality, when using auxiliary light sources, the video quality obtained by the existing automatic exposure method is not good.

Method used

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  • Automatic exposure method and device for LED white-light source
  • Automatic exposure method and device for LED white-light source
  • Automatic exposure method and device for LED white-light source

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Embodiment Construction

[0024] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

[0025] The most critical idea of ​​the present invention is to incorporate the driving current of the LED white light into the range of automatic exposure adjustment parameters, and at the same time, give priority to adjusting the aperture size and shutter speed, and alternately adjust the driving current of the LED white light and the automatic gain value, effectively ensuring the video exposure. quality and reduced power consumption of imaging equipment.

[0026] see figure 1 , a kind of automatic exposure method for LED white light lamp, comprises steps:

[0027] S1. Obtain the brightness of the current video, and calculate the difference between the current video brightness and the preset video brightness;

[0028] S2. Judging whethe...

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PUM

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Abstract

The invention discloses an automatic exposure method for an LED white-light source. The method includes the steps that first, the brightness of a current video is acquired, and the difference value between the brightness of the current video and preset video brightness is calculated; second, whether the difference value is within a preset range is judged, and if not, the f-number and the shutter speed are adjusted according to the difference value so that automatic exposure can be performed; third, the first step and the second step are executed again, whether the f-number and the shutter speed are adjusted to preset threshold values is judged, if yes, the driving current and an automatic gain value of the LED white-light source are adjusted alternately till the next threshold value is achieved, automatic exposure is performed after the driving current or the automatic gain value of the LED white-light source is adjusted every time, and the third step is continued till the video ends. The invention further discloses an automatic exposure device for the LED white-light source. Due to the method and devoice, the control accuracy of automatic exposure is more accurate, and the quality effect of the video is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of electronic imaging, in particular to an automatic exposure method and device for LED white light lamps in the field of electronic imaging. Background technique [0002] The 2A algorithm is the automatic exposure and automatic white balance algorithm (Auto Exposure / Auto White Balance), which is an essential function of the front-end digital imaging equipment, and its implementation directly affects the quality of the imaging. [0003] Automatic exposure is used to dynamically adjust the opening and closing of the lens aperture, the speed of the electronic shutter of the photosensitive device, and the gain value of the digital processor according to the external light conditions, so as to achieve constant video brightness and ensure a good video dynamic range; automatic white balance is used To ensure that the device can correctly restore the color of external objects in any color temperature environment, the color t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
Inventor 邹剑刚张艳玲
Owner SHENZHEN INFINOVA
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