CN108200353B

CN108200353B - Method for detecting environment light of security monitoring camera

Info

Publication number: CN108200353B
Application number: CN201810146812.5A
Authority: CN
Inventors: 王思俊; 刘琰; 瞿关明; 王玉喜
Original assignee: Tianjin Tiandy Information Systems Integration Co ltd
Current assignee: Tianjin Tiandy Information Systems Integration Co ltd
Priority date: 2018-02-12
Filing date: 2018-02-12
Publication date: 2020-05-12
Anticipated expiration: 2038-02-12
Also published as: CN108200353A

Abstract

The invention provides a security monitoring camera environment light detection method, which specifically comprises the following steps: (1) detecting the ambient illumination through sensor exposure of the camera, and judging whether the ambient illumination is less than a set illumination value; (2) if the illuminance value is smaller than the set illuminance value, the infrared lamp is started to supplement light; (3) detecting the ambient illumination through the light sensitivity of the camera, and judging whether the ambient illumination is greater than a set illumination value; (4) and if the illuminance value is greater than the set illuminance value, the infrared lamp is turned off. According to the invention, through a photosensitive and Sensor exposure detection scheme, ambient light is detected in a combined manner, the illumination value is read through the exposure of the Sensor of the camera in the daytime, and the ambient light illumination is detected through the photosensitive of the camera after turning black and white, so that the problems of inaccurate low illumination and instability of a single scheme are solved.

Description

Method for detecting environment light of security monitoring camera

Technical Field

The invention belongs to the technical field of security monitoring, and particularly relates to a security monitoring camera environment light detection method.

Background

Along with the rapid development of physical network technique, security protection monitoring product also more and more appear in people's life, and the life of giving people has brought more and more facility, and traditional camera is general to add ambient brightness sensor to the light detection of surrounding environment, but single ambient light detection method is not accurate, single photosensitive detection that uses, and the advantage is not influenced by the infrared light, shortcoming: the detection of low illumination is insensitive, and the detection precision is not enough when the detection is lower than the ambient light below 1 lux; the Sensor exposure detection is singly used, and the advantages are that: the infrared lamp is accurate in detection, environment light below 1lux can be detected, the defect is easily influenced by infrared light, when the infrared lamp is turned on, the detected environment light brightness is increased, the infrared lamp is turned off, and the problem that the infrared lamp is repeatedly switched is easily caused.

Disclosure of Invention

In view of this, the present invention is directed to provide an environmental light detection method for a security monitoring camera, so as to meet the requirement of the security monitoring camera for low-illumination environmental detection.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a security monitoring camera environment light detection method specifically comprises the following steps:

(1) detecting the ambient illumination through sensor exposure of the camera, and judging whether the ambient illumination is less than a set illumination value;

(2) if the illuminance value is smaller than the set illuminance value, the infrared lamp is started to supplement light;

(3) detecting the ambient illumination through the light sensitivity of the camera, and judging whether the ambient illumination is greater than a set illumination value;

(4) and if the illuminance value is greater than the set illuminance value, the infrared lamp is turned off.

Further, in the step (1), by reading the real-time exposure value of the Sensor, the current ambient light brightness is calculated by the following specific calculation formula:

Fki＝(((Bsum/Gsum)-1)*((Rsum/Gsum)-1)*Ftype)^2；

wherein, Rsum, Gsum and Bsum are brightness statistical information of RGB colors respectively;

ftype is a color brightness statistical coefficient related to the sensor, and is determined through multi-scene testing; fki is the final luminance calculation coefficient.

Further, in step (1), the adjustment coefficient needs to be used in combination with the current luminance statistical information, and a certain algorithm adjustment needs to be performed on the coefficient to ensure that the calculation of the actual luminance is not affected in the actual scene, where the specific algorithm is as follows:

Flum＝Fsensor*lum*Fki

wherein lum is the statistical information of brightness obtained by calculating the average brightness

Fki is the value of the coefficient of the color influence luminance calculated in the previous step

Fsensor is the final adjustment factor for brightness, obtained by multi-scene contrast.

Compared with the prior art, the method for detecting the environmental light of the security monitoring camera has the following advantages:

according to the invention, through a photosensitive and Sensor exposure detection scheme, the environment light is detected in a combined manner, the illumination value is read through the exposure of the Sensor of the camera in the daytime, and the illumination of the environment light is detected through the photosensitive of the camera after the camera is turned black and white, so that the problems of inaccurate low illumination and instability of a single scheme are solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a diagram illustrating a photo-sensitive photocurrent curve according to an embodiment of the present invention;

fig. 2 is a flowchart of an environmental light detection method for a security monitoring camera according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The light-sensitive photocurrent curve shown in fig. 1; the technical scheme adopted by the invention is shown in figure 2, and the problem of low illumination inaccuracy and instability of a single scheme are solved by combining and detecting ambient light through a photosensitive and Sensor exposure detection scheme (in a combination mode, an illumination value is read through exposure of a Sensor of a camera in the daytime, and the illumination value is detected through the photosensitive of the camera after the illumination value is turned black and white), and the current ambient light brightness is converted by using the Sensor exposure detection scheme and reading the real-time exposure value of the Sensor in the daytime (the parameter formula is as follows):

Fki＝(((Bsum/Gsum)-1)*((Rsum/Gsum)-1)*Ftype)^2

wherein, Rsum, Gsum and Bsum are brightness statistical information of RGB three colors respectively

Ftype is a statistical coefficient of color brightness related to the sensor, and is determined by a multi-scene test.

Fki is the final luminance calculation coefficient.

Furthermore, the adjustment coefficient needs to be used in combination with the current luminance statistical information, and certain algorithm adjustment needs to be performed on the coefficient, so that the calculation of the actual luminance is not affected in an actual scene.

The algorithm formula is as follows:

Flum＝Fsensor*lum*Fki

Fsensor is the final adjustment factor for brightness, which is obtained by multi-scene contrast.

) Judging whether the illuminance is lower than a set illuminance value or not, and judging whether an infrared lamp needs to be turned on for light supplement or not; at night, when the infrared lamp is turned on, the infrared lamp passes through photosensitive detection, the ambient light illumination intensity and the photosensitive filter are used for isolating the infrared light, so that the illumination intensity of the ambient light is not influenced by the turned-on infrared lamp.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A security monitoring camera environment light detection method is characterized in that: the method specifically comprises the following steps:

by reading the real-time exposure value of the Sensor, the specific calculation formula converted into the current ambient light brightness is as follows:

Fki＝(((Bsum/Gsum)-1)*((Rsum/Gsum)-1)*Ftype)^2；

ftype is a color brightness statistical coefficient related to the sensor, and is determined through multi-scene testing; fki is the final luminance calculation coefficient;

the adjustment coefficient needs to be used in combination with the current luminance statistical information, and certain algorithm adjustment needs to be performed on the coefficient to ensure that the calculation of the actual luminance is not affected in an actual scene, and the specific algorithm is as follows:

Flum＝Fsensor*lum*Fki

Fki is the final luminance calculation coefficient

Fsensor is the final brightness adjustment coefficient and is obtained by multi-scene comparison;