Control method and device of light ring

Abstract

The invention discloses a control method and device of a light ring. According to change of shutter time and change of a gain value, the light ring of an adjustment lens is controlled so as to be adaptive to versatile demands of an application scene. The control method of the light ring comprises the following steps of acquiring current environment brightness, the shutter time of the lens and the gain value during exposure; adjusting the shutter time and the gain value in an automatic exposure mode when the difference between the current environment brightness and the preset target brightness is determined to exceed a preset threshold interval; and controlling the light ring of the adjustment lens according to the change of the shutter time and the change of the gain value.

Description

technical field [0001] The invention relates to the technical field of aperture control for security monitoring, in particular to a control method and device for an aperture. Background technique [0002] At present, the types of automatic iris lenses for security equipment include: DC drive type, Hall feedback type, and P-iris type. The Hall duty cycle is used to precisely set the aperture size, and the P-iris type is a new type of aperture, which roughly controls the aperture size through a stepping motor. The cost of P-iris is relatively low, and at the same time, it has the characteristic of automatically and accurately setting the aperture size. Therefore, the research on the aperture control strategy of P-iris lens is very necessary. [0003] The existing security equipment p-iris lens control method is to introduce the optimal aperture into the control, and set the lens to work at the optimal aperture position from the beginning. During the process, the ambient brigh...

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Problems solved by technology

[0004] However, the existing technology inserts the aperture adjustment into the shutter and gain control process, and there is only a single mode of adjustment, that is, when the gain is 0 and the shutter is at the maximum value within the set range, it is possible to switch to the aperture adjustment process, and Actually for different application scenarios, for example: the application of intelligent traffic capture machine, the shutter is generally at a small value, at this time, it is necessary to rely on gain and aperture adjustment to obtain the ideal brightness; another example: dome camera monitoring, different magnification Under different conditions, the requirements for the shutter and aperture are different. When the magnification is small, the image is required to be as clear as possible. At this time, you can adjust the shutter and gain first, and put the aperture at the best position. Only enter the aperture when it is too bright or too dark. When the magnification is large, in order not to produce motion blur, the shutter is required to be as short as possible. At this time, the aperture needs to be adjusted earlier.

[0005] To sum up, the single-mode aperture adjustment method used in the prior art cannot meet the diverse needs of application scenarios

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