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Day and night automatic switching method, device and system

A technology for automatic switching and camera devices, which is applied to components of TV systems, color signal processing circuits, TVs, etc. It can solve the problems of repeated day and night switching, and achieve the effect of reducing the design.

Active Publication Date: 2019-04-30
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the activation or removal of the infrared cut-off filter will affect the brightness of the imaging picture, when the brightness of the imaging picture in the color camera mode is less than the screen brightness threshold, after the front-end camera device switches to the black and white camera mode, the brightness of the imaging picture is greater than Screen brightness threshold, camera mode switching from black and white camera mode to color camera mode, that is, the problem of repeated day and night switching, day and night switching is repeated, usually in the period of day and night alternation, which is a common problem in the field of camera technology

Method used

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  • Day and night automatic switching method, device and system
  • Day and night automatic switching method, device and system
  • Day and night automatic switching method, device and system

Examples

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no. 1 example

[0058] In the first embodiment, the method for automatically switching between day and night according to the present invention is described by using the front-end camera device to take pictures in the morning time period as an example.

[0059] In the early morning period, the illuminance gradually changes from 0.001lux at night to 500lux, during which the proportion of infrared light in imaging light gradually decreases. When the front-end camera takes pictures in the early morning, the camera mode is black and white before the illuminance reaches a predetermined value. After the illuminance reaches a predetermined value, the camera mode of the front-end camera needs to be switched from black and white to color.

[0060] At the same time, in the early morning time period, if the front-end camera device adopts an automatic day-night switching scheme based on the brightness of the imaging screen to perform automatic day-night switching, it is very easy to cause technical proble...

no. 2 example

[0102] In the second embodiment, the method for automatically switching between day and night according to the present invention is described by using the front-end camera device to take pictures at dusk as an example.

[0103] At dusk, the illuminance gradually changes from 500lux at sunset to 0.001lux at night, during which the proportion of infrared light in imaging light gradually increases. When the front-end camera takes pictures at dusk, the camera mode is the color camera mode before the illuminance is lower than the predetermined value, and when the illuminance is lower than the predetermined value, the camera mode of the front-end camera needs to be switched from the color camera mode to the black-and-white camera mode.

[0104] At the same time, at dusk, if the front-end camera device adopts an automatic day-night switching scheme based on the brightness of the imaging screen for automatic day-night switching, it is very easy to cause technical problems of repeated d...

no. 3 example

[0119] In the third embodiment, the daytime illuminance drops sharply to black and white camera mode and then the illuminance returns to normal, such as before and after daytime rainstorm or sandstorm, to illustrate the day-night automatic switching method of the present invention.

[0120] Before and after the daytime rainstorm or sandy weather, the illuminance drops sharply from the color camera mode to the black and white camera mode, and then the illuminance returns to the color camera mode.

[0121] In rainy or dusty weather during the day, if the front-end camera device adopts an automatic day-night switching scheme based on the brightness of the imaging screen for automatic day-night switching, it is very easy to cause technical problems of repeated day-night switching.

[0122]In the daytime rainstorm or sandy weather, in the embodiment of the present invention that uses the front-end camera device to take pictures, the camera mode of the front-end camera device include...

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Abstract

Embodiments of the present invention provide a method, device and system for automatically switching between day and night. The method, device and system obtain the white balance statistical information of the current black and white imaging picture in the black and white imaging mode; calculate the picture of the current black and white imaging picture based on the white balance statistical information Brightness infrared light contribution rate; when the picture brightness infrared light contribution rate is less than the preset picture brightness infrared light contribution rate threshold, obtain the exposure statistical information of the current black and white imaging picture; calculate the picture illuminance of the current black and white imaging picture based on the exposure statistical information; when When the image illuminance is greater than the preset image illuminance threshold, the black-and-white imaging mode is switched to the color imaging mode. The invention can eliminate the technical problem of repeated day and night switching without adding hardware.

Description

technical field [0001] The invention relates to the technical field of camera control, in particular to a day and night automatic switching method, device and system. Background technique [0002] Day and night switching is a camera mode conversion function required by the front-end camera device, which means that the front-end camera device determines whether the camera mode is color camera mode or black-and-white camera mode based on the light intensity of the camera scene. The traditional automatic day-night switching scheme includes the automatic day-night switching scheme based on the brightness of the imaging screen and the automatic day-night switching scheme based on the light intensity measured by the photoresistor. [0003] The automatic day and night switching scheme based on the brightness of the imaging screen is to preset the screen brightness threshold on the front-end camera device. When the brightness of the imaging screen is greater than or equal to the scr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N9/73H04N5/238H04N23/75
CPCH04N23/667H04N23/75H04N23/88
Inventor 熊青辉毛强
Owner ZHEJIANG UNIVIEW TECH CO LTD
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