CN104079886A - Method for detecting whether monitoring camera shielded or disturbed - Google Patents

Abstract

The invention relates to the technical field of video processing, in particular to a method for detecting whether a monitoring camera is shielded or disturbed. The method includes the concrete step that a luminance transducer is arranged beside the monitoring camera and used for monitoring the current environmental luminance in real time. Because the environmental luminance gradually changes rather than changing suddenly, when the luminance changes suddenly (becoming larger or smaller suddenly), it is considered that abnormality occurs, and a system gives an alarm. The method has the advantages that when the monitoring environmental luminance changes suddenly, a prompt can be automatically given, manual workloads are reduced, and automatic monitoring is achieved.

Description

A kind ofly detect the method that monitoring camera is blocked or disturbs

Technical field

The present invention relates to technical field of video processing, detect in particular to a kind of the method whether monitoring camera is blocked or disturbs.

Background technology

At present, monitoring camera has all been installed in domestic many public place.Monitoring camera is widely used in the security fields such as bank, traffic, urban public security.

It is reported, there is robber and blocked with foreign matter that monitoring camera is stolen or other unlawful activities in some places, and the productive life of giving the people even lives and properties has caused considerable damage.Although monitoring camera has corresponding monitored picture, the workload of a large amount of cameras of artificial monitoring is in real time very big, and night the scene at dark place is easily made to erroneous judgement, thereby has opportunity to lawless person.In addition, some lawless persons are irradiated camera with torch etc., and this can make camera fuzzy pictures even cannot normally work.

Summary of the invention

The object of the present invention is to provide a kind of method whether monitoring camera is blocked or disturbs that detects, to solve the above problems.

Realizing concrete thought of the present invention is, on the side of monitoring camera, luminance sensor is set, and is used for the in real time current ambient brightness of monitoring.Because ambient brightness does not suddenly change, there is the process of a gradual change, therefore, in the time that brightness is undergone mutation (brighten suddenly or dimmed suddenly), be considered as abnormal conditions, system is reported to the police.

Advantage of the present invention is: in the time that monitoring environment brightness is undergone mutation, can automatically point out, thereby reduce artificial workload, realize automatic monitoring.

Brief description of the drawings

Fig. 1 is flow chart of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail.

With reference to Fig. 1, realize concrete steps of the present invention as follows:

(1) threshold value setting

1a) arrange and be used for time interval of contrast, such as 5 seconds or 1 minute etc., arranging flexibly depending on application scenario;

2a) luminance difference that luminance sensor detects is set, is i.e. when variation that brightness has produced much degree, just reports to the police;

3a) bound of the brightness value that luminance sensor detects is set, i.e. brightness higher or lower than how many times is just reported to the police.

(2) obtain the brightness value that current luminance sensor detects

2a) obtain the brightness value that current luminance sensor detects

(3) relatively

The brightness absolute value threshold values comparison that the current brightness value that luminance sensor 3a) step (2) being obtained detects and step (1) are set, if be greater than the upper limit or be less than lower limit, reports to the police and manually processes.If brightness value within the scope of absolute value threshold values, the brightness value before poor with preset time compares, and is detected the threshold values that whether exceeds the luminance difference that step 1 sets by system.If exceed this threshold values, carry out alarm and manually process.

Although the above has described embodiments of the invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (1)

1. detect the method whether monitoring camera is blocked or disturbs, comprise the following steps:

(1) threshold value setting

1a) arrange and be used for time interval of contrast, such as 5 seconds or 1 minute etc., arranging flexibly depending on application scenario;

2a) luminance difference that luminance sensor detects is set, is i.e. when variation that brightness has produced much degree, just reports to the police;

3a) bound of the brightness value that luminance sensor detects is set, i.e. brightness higher or lower than how many times is just reported to the police.

(1) obtain the brightness value that current luminance sensor detects

2a) obtain the brightness value that current luminance sensor detects

(3) relatively

The brightness absolute value threshold values comparison that the current brightness value that luminance sensor 3a) step (2) being obtained detects and step (1) are set, if be greater than the upper limit or be less than lower limit, reports to the police and manually processes.If brightness value within the scope of absolute value threshold values, the brightness value before poor with preset time compares, and is detected the threshold values that whether exceeds the luminance difference that step 1 sets by system.If exceed this threshold values, carry out alarm and manually process.