Unlock instant, AI-driven research and patent intelligence for your innovation.

Mixed light supplementing method and device

A fill light, fill light technology, applied in optics, TV, instruments, etc., can solve the problems of only black and white images, poor infrared light sensing ability, etc.

Active Publication Date: 2015-01-21
ZHEJIANG UNIVIEW TECH CO LTD
View PDF6 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the general sensor (sensor) has poorer sensitivity to infrared light than white light, the imaging effect of infrared supplementary light is generally inferior to that of white light supplementary light.
In addition, infrared fill light has a disadvantage that it can only produce black and white images

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mixed light supplementing method and device
  • Mixed light supplementing method and device
  • Mixed light supplementing method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, the elevation angle threshold of the surveillance camera for switching between the white light fill light and the infrared fill light is tested offline.

[0024] The monitoring camera in this embodiment refers more to a dome camera, which can rotate in both horizontal and vertical directions. The elevation angle of the surveillance camera is the angle α between the direction of the vertical lens and the mounting rod of the dome camera. For details, refer to figure 1 example of . In the case of low illumination at night, the elevation angle threshold obtained by the offline test can be determined according to the quality of the image captured by the surveillance camera under the white light supplementary light. For example, gradually change the elevation angle of the camera from small to large, shoot images at each different elevation angle, and judge whether the quality of the image at each elevation angle is acceptable. If acceptable, the elevation angle is not...

Embodiment 2

[0032] The specific implementation process of this embodiment is as follows:

[0033] Step S21, initializing the monitoring camera as white light supplementary light.

[0034] Step S22 , periodically calculating the supplementary light quality of the picture.

[0035] Step S23, when the fill light quality of the picture is lower than the threshold value for switching from white light fill light to infrared light fill light, switch from white light fill light to infrared light fill light, switch the camera to black and white mode at the same time, and record the elevation angle of the monitoring camera at this time Down is used as the elevation angle threshold indicating that the IR fill light switches to the white light fill light.

[0036] Step S24. When the current elevation angle of the surveillance camera is less than the currently recorded elevation angle threshold, switch from infrared light supplementary light to white light supplementary light; at the same time, switc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a mixed light supplementing method. The mixed light supplementing method is applied to a surveillance camera and includes the steps that A, the surveillance camera is initialized to supplement light for a white-light source; B, the light supplementing quality of pictures is calculated periodically; C, when the light supplementing quality of the pictures is lower than a threshold value for switching the white-light supplementing into infrared light supplementing, the white-light supplementing is switched into the infrared light supplementing, the camera is switched to be in a black-white mode simultaneously, and meanwhile an elevation angle of the surveillance camera at the time is recorded to serve as an elevation threshold value for indicating to switch an infrared light supplementing lamp into a white-light supplementing lamp; D, when the current elevation angle of the surveillance camera is smaller than the currently-recorded elevation threshold value, the infrared light supplementing is switched into the white-light supplementing, and meanwhile the camera is switched to be in a colorful mode; the step B is executed. By means of the scheme, respective advantages of white-light supplementing and infrared light supplementing can be fully played in a night low illumination level environment, and the best surveillance effect of the camera is achieved.

Description

technical field [0001] The present invention relates to the technical field of video surveillance, in particular to a method and device for mixing supplementary light. Background technique [0002] In video surveillance applications, in low-light environments such as nighttime, supplementary lights are generally used for supplementary light to enhance the effect of nighttime video surveillance. Commonly used fill lights are divided into two categories: white light fill lights and infrared fill lights. [0003] White light is a kind of visible light, which belongs to cold light source. It is widely used in the road monitoring project as an auxiliary lighting tool for the bayonet camera to capture the vehicle license plate number of the past bayonet; it is used for the auxiliary lighting of the entrance and exit cameras of the parking lot in the community to record the vehicle license plate number. Because the image taken by the camera is in color under the auxiliary lighting...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N5/232H04N9/04G03B15/05
Inventor 汪辉余恒乐
Owner ZHEJIANG UNIVIEW TECH CO LTD