Camera automatic exposure method and control device

A technology of automatic exposure and control device, applied in the field of cameras, can solve the problems of long time consumption of automatic exposure, reduced image quality, complicated calculation, etc., and achieve the effect of fast automatic exposure and low cost

Inactive Publication Date: 2011-12-21
王申秋 +2
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Problems solved by technology

The defect of this implementation method is that the reduction of the exposure time means that the light outside becomes brighter, and the digital brightness gain will amplify the noise. Therefore, when the external light becomes better, reset the digital brightness gain to the highest value under the new exposure time. Value, wil

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  • Camera automatic exposure method and control device
  • Camera automatic exposure method and control device

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Embodiment Construction

[0029] Below in conjunction with the best embodiment shown in the accompanying drawings, it will be further described in detail.

[0030] refer to figure 1 , the automatic exposure method of video camera of the present invention roughly comprises the following steps:

[0031] S101: After the camera works normally, the image processor receives data from the image sensor;

[0032] S102: Calculate the average brightness of the current frame image;

[0033] S103: Compared with the preset average brightness value, if the average brightness value of the current frame image is within the allowable range of the preset average brightness value, then wait for the next frame of data and return to S101; otherwise, proceed to the following steps;

[0034] S104: If the result of the comparison is that the average brightness value of the current frame is greater than the prefabricated average brightness value, then go to S105, otherwise go to S106;

[0035] S105: Judging whether the curre...

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Abstract

A camera automatic exposure method and a control device, the method comprising the following steps: a. obtaining the average brightness value of the current frame image; b. comparing the current frame image average brightness value with a preset average brightness value, if the current frame image If the average brightness value of the current frame image is within the allowable range of the preset average brightness value, maintain the exposure time in the current exposure setting and return to step a, otherwise continue; c. If the average brightness value of the current frame image is greater than the preset average brightness value within the allowable range, adjust the shortening of the exposure time to obtain the new exposure time in the exposure setting; if the average brightness value of the current frame image is less than the allowable range of the preset average brightness value, then adjust the lengthening of the exposure time to obtain the exposure setting a new exposure time; and e, setting the image sensor according to the new exposure time. The present invention can realize automatic exposure at low cost, simply and quickly.

Description

technical field [0001] The invention relates to a camera, in particular to a method for realizing the automatic exposure function of the camera. Background technique [0002] There are many types of existing cameras, and various types of image sensors are used, such as CCD and CMOS. Most of the cameras basically have an automatic exposure function, and there are many ways to realize the automatic exposure function, for example: some realize automatic exposure by changing the amount of light, and some realize automatic exposure by controlling the image sensor. The automatic exposure methods of existing cameras mainly contain the following types: [0003] Only adjusting the aperture to control the amount of light passing through the lens, because the brightness of different scenes varies greatly in reality, the general lens aperture cannot meet the automatic exposure of all scenes, even if there is a lens with a wide aperture range, its price is very expensive, and The contr...

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Application Information

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IPC IPC(8): H04N5/235
Inventor 陈付军侯俊锋
Owner 王申秋
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