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Method and system for controlling day-to-night switching mode of camera and method and system for controlling night-to-day switching mode of camera

A technology of mode control and control method, which is applied to the parts of TV system, image communication, and color TV parts, etc. It can solve the problems of back and forth switching, easy day and night mode of camera, lack of etc.

Active Publication Date: 2015-01-21
SUZHOU KEDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is that the cameras in the prior art lack a method capable of accurately judging and controlling the switching between day and night modes, which causes the cameras to easily switch back and forth between day and night modes and cannot be switched normally, thereby providing A method and system for controlling the day-to-night and night-to-day modes of a camera capable of accurately judging and performing day-to-night mode switching control

Method used

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  • Method and system for controlling day-to-night switching mode of camera and method and system for controlling night-to-day switching mode of camera
  • Method and system for controlling day-to-night switching mode of camera and method and system for controlling night-to-day switching mode of camera
  • Method and system for controlling day-to-night switching mode of camera and method and system for controlling night-to-day switching mode of camera

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Effect test

Embodiment 1

[0079] This embodiment provides a method for controlling the day-to-night mode of the camera, such as figure 1 shown, including the following steps:

[0080] S101. Obtain image brightness value, gain and exposure time;

[0081] S102. Calculate the brightness value of the external environment according to the brightness value of the image, the gain and the exposure time;

[0082] S103. Acquiring the day-to-night threshold;

[0083] S104. Taking the brightness value of the external environment in the day mode before switching as the brightness value of the day mode, and comparing it with the day-to-night threshold, when the day-mode brightness value is less than or equal to the day-to-night threshold, it is judged that the day-to-night threshold is satisfied night conditions.

[0084] Specifically, the image brightness value, gain, exposure time and other parameters can be obtained from the built-in chip of the camera.

[0085] Preferably, the step S103 may also specifically...

Embodiment 2

[0098] This embodiment provides a night mode control method for a camera, such as figure 2 shown, including the following steps:

[0099] S201. Obtain image brightness value, gain and exposure time;

[0100] S202. Calculate the external environment brightness value according to the image brightness value, gain and exposure time;

[0101] S203. Acquiring the night exposure threshold;

[0102] S204. Use the brightness value of the external environment in the night mode before switching as the brightness value of the second night mode;

[0103] S205. Use the difference between the first night mode brightness value and the average value of the day mode brightness value as the first ambient brightness difference, and use the difference between the second night mode brightness value and the first night mode brightness value The difference is used as the second ambient brightness difference;

[0104] S206. When the first ambient brightness difference is less than 0, only compare...

Embodiment 3

[0129] This embodiment provides a camera day switch night mode control system, such as image 3 shown, including:

[0130] The first acquisition device 11 is used to acquire image brightness value, gain and exposure time;

[0131] The first calculation device 12 is used to calculate the brightness value of the external environment according to the brightness value of the image, the gain and the exposure time;

[0132] The first threshold obtaining means 13 is used to obtain the day-to-night threshold;

[0133] The first condition judging device 14 is used to use the brightness value of the external environment in the day mode before switching as the brightness value of the day mode, and compare it with the threshold value of switching from day to night, when the brightness value of the day mode is less than or equal to the switching from day to night When the threshold is reached, it is judged that the condition of day and night is met.

[0134] Preferably, the first thresh...

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Abstract

The invention provides a method and system for controlling the day-to-night switching mode of a camera and a method and system for controlling the night-to-day switching mode of the camera. The method for controlling the day-to-night switching mode of the camera includes the steps that an image luminance value, gains and the exposure time are obtained, an external environment luminance value is calculated according to the image luminance value, the gains and the exposure time, then a day-to-night switching threshold is obtained, the external environment luminance value in the day mode before switching is carried out serves as a day mode luminance value and is compared with the day-to-night switching threshold, and only when the day mode luminance value is smaller than or equal to the day-to-night switching threshold, it can be judged that the day-to-night switching condition is met. The luminance information, namely the external environment luminance value, of the external environment at the moment can be inversely calculated according to the image luminance value, the gains and the exposure time in the current environment, whether the day-to-night switching condition is met or not is judged according to the relationship between the external environment luminance value and the day-to-night switching threshold, and phenomena that the day mode and the night mode are repeatedly switched and can not be normally switched due to inaccurate judgment are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of video surveillance. In particular, it relates to a control method and system for a day-to-night mode and a night-to-day mode of a camera. Background technique [0002] In order to maintain social stability, some important occasions or road sections need to meet the needs of all-weather monitoring, so the camera needs to have the function of day and night switching, which can automatically switch between day and night according to the external environment. When the ambient illumination is sufficient, the infrared filter is used to filter out the infrared to obtain images; when the ambient illumination is insufficient, an all-pass filter is used to obtain images without filtering out the infrared. Therefore, for the camera, it is particularly important to automatically switch between the infrared filter filter and the all-pass filter. [0003] At present, there are mainly two methods of hardware and softw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232
Inventor 陈磊张荣祥李祥胜章勇曹李军陈卫东
Owner SUZHOU KEDA TECH
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