Auto-Iris Control Method
AssigneeHuawei Technologies Co., Ltd.
InventorsTao Huang, Jianzhang Li
Life of this patent
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Abstract
An auto-iris control method, including setting a target luminance value of an auto iris; collecting an image at a current moment and calculating a luminance value of the image collected at the current moment; comparing the target luminance value with the luminance value of the image collected at the current moment; comparing an absolute value of the luminance difference at the current moment with a preset luminance difference threshold, determining a status of the auto iris at the current moment, and using a corresponding proportional-integral-derivative (PID) algorithm to calculate a direct current control voltage at the current moment; and adjusting an action of the auto iris according to the calculated direct current control voltage.
Claims12
An auto-iris control method, comprising:
- setting a target luminance value of an auto iris;
- collecting an image at a current moment;
- calculating a luminance value of the image collected at the current moment;
- comparing the target luminance value with the luminance value of the image collected at the current moment to obtain a difference between the target luminance value and the luminance value of the image collected at the current moment and use the difference as a luminance difference at the current moment;
- comparing an absolute value of the luminance difference at the current moment with a preset luminance difference threshold;
- determining a status of the auto iris at the current moment;
- using a corresponding proportional-integral-derivative (PID) algorithm to calculate a direct current control voltage at the current moment;
- and
- adjusting an action of the auto iris according to the calculated direct current control voltage.
An auto-iris control system, comprising:
- a processor configured to:
- set a target luminance value of an auto iris;
- collect an image at a current moment;
- calculate a luminance value of the image collected at the current moment;
- compare the target luminance value with the luminance value of the image collected at the current moment to obtain a difference between the target luminance value and the luminance value of the image collected at the current moment and use the difference as a luminance difference at the current moment;
- compare an absolute value of the luminance difference at the current moment with a preset luminance difference threshold;
- determine a status of the auto iris at the current moment;
- use a corresponding proportional-integral-derivative (PID) algorithm to calculate a direct current control voltage at the current moment;
- and
- adjust an action of the auto iris according to the calculated direct current control voltage.
Dependencies are inferred from the claim text.