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Self-adaptive quick setting method of auto iris driving voltage value

A technology of automatic iris and driving voltage, which is applied to parts of color TVs, parts of TV systems, and TVs, etc. It can solve the problems of many repeated comparisons, poor compatibility of automatic iris lenses, and long stabilization time.

Inactive Publication Date: 2010-09-08
ZHEJIANG DAHUA TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the shortcomings of the existing method for controlling the driving voltage of the automatic aperture of the existing network camera, there are many times of repeated comparisons, long stabilization time, and poor compatibility of the automatic aperture lens. The present invention provides a method for adaptively and quickly setting the driving voltage value of the automatic aperture. This method can quickly set the parameters of the auto-iris drive voltage value, reduce the repeated process of auto-iris, has self-adaptive ability, can be compatible with the application of different types of auto-iris lenses, and ensures the consistency of image brightness, quick setting, and no repetition. Meet the actual use requirements in the field of security monitoring

Method used

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  • Self-adaptive quick setting method of auto iris driving voltage value

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Embodiment Construction

[0009] The method for self-adaptively and quickly setting the value of the automatic iris driving voltage of the present invention includes the following steps:

[0010] (1) Initialize the drive voltage value

[0011] Pre-set the default value of the drive voltage of the automatic iris V0, the maximum drive voltage value of the automatic iris Vmax, the user's visual effect preset reference brightness value Y0, the percentage of the maximum allowable deviation D0, the loss parameter A0 of the circuit loss, and collect The image size is n rows and m columns. When the network camera device is powered on, it enters the step of initializing the driving voltage value, and the driving voltage value of the automatic iris will be preset to the default value V0.

[0012] (2) Obtain the component data of the image Y / C

[0013] Extract the Y and C values ​​of all pixels in the current image, where the Y value of a single pixel is Y xy .

[0014] (3) Image brightness value calculation

[0015] Calc...

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Abstract

The invention discloses a self-adaptive quick setting method of an auto iris driving voltage value, which comprises the steps of initializing a driving voltage value, acquiring component data of an image Y / C, computing image brightness values, comparing the brightness values, computing the driving voltage value and the like. The method quickly computes and sets the parameters of the auto iris driving voltage value according to the conditions of the image brightness value and the driving voltage value, is compatible with the application of auto iris lenses with different models, and has the functions of inspecting the change state of the image brightness in real time and updating the driving voltage value of the auto iris in time according to the new change condition.

Description

Technical field [0001] The invention relates to the field of security monitoring, in particular to a method for self-adaptively quickly setting an automatic iris driving voltage value of a network camera. Background technique [0002] At present, the method of controlling the automatic iris driving voltage of the network camera in the security monitoring field uses a circuit to obtain the quantized level of the CVBS video signal, compare it with the preset reference analog level, and generate the control automatic iris driving voltage through the integration circuit, according to the automatic iris The change of the image brightness after the change of the aperture, the comparison is repeated many times, until the quantization level of the CVBS video signal and the preset reference analog level. This process is repeated many times and takes a long time. It often takes more than 3 seconds to stabilize the lens, especially when the brightness is obvious, it takes longer, and during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232H04N5/238H04N23/75
Inventor 殷俊傅利泉张兴明吴坚
Owner ZHEJIANG DAHUA TECH CO LTD
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