Automatic exposure control method
A control method and automatic exposure technology, applied in the field of image algorithm, can solve the problem of not being able to adapt to the human eye quickly, and achieve the effect of simple algorithm, clear and bright image, and easy to use.
Active Publication Date: 2011-10-05
BYD SEMICON CO LTD
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[0006] In order to solve the problem that the current exposure adjustment is easy to reach the extreme value and the adjustment control process when the scene with abrupt brightness suddenly appears in the image movement process cannot quickly adapt to the human eye, an automatic exposure control method is proposed. To achieve the purpose of improving the above problems
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[0019] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0020] Such as figure 1 As shown, the embodiment of the present invention discloses an automatic exposure control method, including:
[0021] Step a: obtain the pixel value of the image;
[0022] Step b: adjusting the integration time and gain of the image based on the pixel value feature of the image;
[0023] Step c: judging whether the adjustment of the integration time and gain has reached the preset target value at this time, if the target value is reached, proceed to step e, if not, proceed to the next step, namely step d;
[0024] Step d: Judging whether the a...
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The invention provides an automatic exposure control method. The method comprises the following steps of: a) obtaining a pixel value of an image; b) adjusting an integral time and gain of the image based on the pixel value feature of the image; c) judging whether or not the integral time and the gain are adjusted to predetermined target values at present; if not, entering the next step; d) judging whether the integral time and the gain are both adjusted to maximum values or minimum values at present; when the integral time and the gain are both adjusted to the maximum values but not to the target values, obtaining a pixel value with high flexibility, and performing the step b; and when the integral time and the gain are both adjusted to the minimum values but not to the target values, obtaining a pixel value with low flexibility, and performing the step b. by the embodiment of the invention, the confliction that the brightness of an image does not reach the requirement when the integral time and the gain reach limits at present can be solved; meanwhile, image flicker caused by a light source with a fixed frequency is removed, and the image is clear and bright.
Description
technical field [0001] The invention belongs to the field of image algorithms, in particular to an algorithm for automatic exposure when a photoelectric sensor is imaging. Background technique [0002] Current image capture equipment, including cameras, mobile phone cameras, monitoring devices and other equipment using photoelectric sensors, all use automatic exposure algorithms. [0003] In the process of taking pictures, if the exposure is underexposed, the image will be very dark and the subject is not clear. If the exposure is overexposed, the image will easily become bright white and blurry. The previous automatic exposure algorithm has certain defects in the selection of effective pixels that cause human eyes to be sensitive, and the adjustment process of gain and integration time is not well coordinated, and it is easy to cause the gain and integration time to reach extreme values, but the image The effect has not yet met the desired phenomenon. [0004] In addition...
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IPC IPC(8): H04N5/235
Inventor 旷江华刘志强傅璟军胡文阁
Owner BYD SEMICON CO LTD