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Method and device for switching modes of video camera with infrared supplementary light

An infrared fill light and mode switching technology, applied in the field of cameras, can solve the problems of low accuracy and low accuracy of camera mode switching.

Active Publication Date: 2020-07-03
HANGZHOU HIKVISION DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the mode switching method in the prior art only uses light intensity to determine the scene state, and the accuracy of the judgment is not high, resulting in low accuracy of camera mode switching

Method used

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  • Method and device for switching modes of video camera with infrared supplementary light
  • Method and device for switching modes of video camera with infrared supplementary light
  • Method and device for switching modes of video camera with infrared supplementary light

Examples

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example 1

[0134] Example 1, preset th_low=200, th_ext=800.

[0135] The camera changes from a scene with strong light to an indoor scene with no light. At this time, the light intensity is low, and the current illumination is 100. Because the first judgment condition is met, switch to the night mode at this time, turn on the infrared fill light, and turn off the infrared filter. The light sheet is set to infrared light mode. Due to the narrow indoor environment and the strong infrared reflection, the light intensity increases instantly after turning on the infrared supplementary light. At this time, the average value i_avg of the illumination within the preset time period is 2000.

[0136] Calculated according to i_avg:

[0137] th_high=2000*1.25=2500

[0138] th_mid=2000*0.75=1500

[0139] Afterwards, the user takes the camera and goes outdoors. It is evening or cloudy outside. Although the light intensity is slightly low, there is no need to turn on the infrared fill light, and it ...

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Abstract

Embodiments of the present invention provide a mode switching method and device for a camera with an infrared supplementary light. The method includes: periodically acquiring the current light intensity of the camera and the first scene state determined in the previous cycle. The first scene state includes Day state or night state; if the first scene state is day state, determine the scene state of this cycle according to the current light intensity and the preset daytime light intensity threshold; according to the scene state of this cycle, determine to switch to night mode or keep Daytime mode; if the first scene state is night state, calculate and obtain the current ratio of red component / green component according to the image obtained when the current light intensity is obtained; according to the current light intensity, the current ratio of red component / green component, night light The intensity threshold and the preset threshold of the red component / green component ratio determine the scene state of the current cycle; according to the scene state of the current cycle, it is determined to switch to the day mode or maintain the night mode.

Description

technical field [0001] The invention relates to the field of cameras, in particular to a method and device for switching modes of a camera with an infrared supplementary light. Background technique [0002] Cameras that need to work under different light intensities, such as day and night, are generally equipped with infrared fill light and infrared filter, and automatically switch the working mode of the camera by judging the scene status. A mode switching method of an existing camera is as follows: compare the light intensity with a preset threshold, and when the light intensity is greater than the threshold, determine that the scene state is a daytime state, switch the mode to the daytime mode, turn off the infrared supplementary light, and set the The infrared filter is switched to the cut-off infrared light mode to prevent the infrared light from entering and causing image color cast; when the light intensity is less than or equal to the threshold, determine that the sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N5/235
CPCH04N23/66H04N23/64H04N23/74
Inventor 张青
Owner HANGZHOU HIKVISION DIGITAL TECH