Method and device for regulating exposure

A technology of exposure time and brightness, which is applied in the field of photography, can solve problems such as the instability of the exposure adjustment process, and achieve the effect of enhancing stability and reducing overshoot

Active Publication Date: 2010-10-27
HANGZHOU HIKVISION SYST TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide an exposure adjustment method and device

Method used

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  • Method and device for regulating exposure
  • Method and device for regulating exposure
  • Method and device for regulating exposure

Examples

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no. 1 example

[0027] see figure 2 , is the flow chart of the first embodiment of the exposure adjustment method of the present application:

[0028] Step 201: Divide the system luminance interval into at least three sub-intervals in advance, and set a fitting function for each sub-interval, and pre-set a target luminance value and its upper limit value and lower limit value.

[0029] The use of a single form of fitting function in the prior art will lead to problems of excessive overshoot and unstable exposure control of the system. Therefore, the embodiment of the present application divides the system brightness interval into at least three sub-intervals. For the brightness values ​​belonging to different sub-intervals Different functions are used to fit luminance to system gain, and luminance to system exposure time. For example, usually the range of the system brightness interval is [0, 255], and the above interval is divided into at least three brightness sub-intervals. Wherein, two...

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Abstract

The embodiment of the invention discloses a method for regulating exposure, which is characterized by dividing the lightness interval of a system into at least three subintervals in advance, respectively setting a fitting function for each subinterval, and presetting an object lightness value, an upper limit value and a lower limit value thereof. The method comprises the following steps: obtaining parameter values at the current time, wherein the parameter values comprise a lightness statistic value of an input image at the current time; when the lightness statistic value is not within the interval composed of the upper limit value and the lower limit value of the object lightness value, judging the subinterval to which the lightness statistic value belongs; and regulating the exposure through the fitting function corresponding to the subinterval to which the lightness statistic value belongs. The embodiment of the invention further discloses an exposure regulating device. The embodiment of the invention also discloses an exposure regulating device. Different fitting functions are set for different lightness intervals, so new grains and exposure times of different intervals can be calculated according to the different fitting functions in the exposure regulating process, thereby reducing overshoot and enhancing the stability of exposure control of the system.

Description

technical field [0001] The present application relates to the field of imaging technology, and in particular to an exposure adjustment method and device. Background technique [0002] Exposure is the process of forming an image through a photosensitive device such as CMOS (Complementary Metal-Oxide Semiconductor, Complementary Metal Oxide Semiconductor) receiving light from the lens, and the time when the photosensitive device receives light is the exposure time. In the process of shooting, the intensity of light and shade of the background or subject will change, so when the external light becomes stronger, it will be overexposed, resulting in the captured picture being too bright and lacking in layers and details, and it will be exposed when the external light becomes weaker Insufficient, resulting in the pictures taken are too dark to reflect the real color, so the exposure needs to be adjusted and controlled during the shooting process, in which the automatic exposure ad...

Claims

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Application Information

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IPC IPC(8): H04N5/235
Inventor 黄崇基陈军贾永华胡扬忠邬伟琪蒋海青
Owner HANGZHOU HIKVISION SYST TECH
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