A method and system for controlling day-to-night and night-to-day modes of a camera

Abstract

The present invention provides a method and system for controlling the day-to-night mode and night-to-day mode of a camera. The day-to-night mode control method and system of the camera obtain image brightness value, gain and exposure time, and according to the image brightness value, Gain and exposure time calculate the brightness value of the external environment, and then obtain the day-to-night threshold value, and use the external environment brightness value in the day mode before switching as the day mode brightness value. Compared with the day-to-night threshold value, the day mode brightness value is less than or equal to When the day-to-night threshold is reached, it will be judged that the conditions for day-to-night switching are met. It can invert the brightness information of the external environment at this time according to the image brightness value, gain and exposure time in the current environment, that is, the brightness value of the external environment, and judge whether the daily cut is satisfied according to the relationship between the brightness value of the external environment and the threshold value of day cut and night. Night conditions, effectively reducing the phenomenon of switching back and forth between day and night mode and not switching normally due to inaccurate judgment.

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...

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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

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