CN-121999570-A - Linkage test method for security camera and alarm for cultural relic ancient architecture

CN121999570ACN 121999570 ACN121999570 ACN 121999570ACN-121999570-A

Abstract

The invention provides a linkage test method of a security camera and an alarm for a cultural relic ancient architecture, which relates to the technical field of the linkage test of the cultural relic ancient architecture, and comprises the steps of selecting a test area, and collecting and recording initial state parameters of a communication link and initial state parameters of a camera view; the method comprises the steps of simulating a fire environment, triggering a test event according to a time sequence inversion mode, continuously collecting real-time error rate of a communication link, linkage time delay between an alarm and a camera and image definition data of a video stream of the camera after the intrusion simulation signal is triggered, calculating a linkage reliability index according to the collected real-time error rate, linkage time delay and the collected image definition data, and comparing the linkage reliability index with a preset threshold value to judge whether linkage test is qualified or not. The invention solves the problems of single scene, ideal environment and subjective judgment of the traditional method by constructing an extreme test scene of fire and intrusion combination and quantitatively evaluating the linkage performance.

Inventors

DENG GANG
MA YUJUN
Deng Cezhong
XIAO RUI
Yuan Shangxuan
GUO ZHENGMING
YUAN XINGCHAO
Du Sijing

Assignees

四川省电子产品监督检验所

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (9)

1. The linkage test method for the security camera and the alarm for the historic building of the cultural relics is characterized by comprising the following steps: S1, selecting a test area, and collecting and recording initial state parameters of a communication link and initial state parameters of a camera view; step S2, simulating a fire environment, including applying controllable physical degradation to the communication link to simulate the destruction of a high Wen Duixian cable, and applying controllable visual masking to the camera field of view to simulate smoke masking; Step S3, triggering a test event according to a time sequence inversion mode, namely firstly starting the simulation of the fire environment, and triggering an intrusion simulation signal after the simulation of the fire environment reaches a preset condition; step S4, continuously collecting real-time error rate of the communication link, linkage time delay between the alarm and the camera and image definition data of a video stream of the camera after the intrusion analog signal is triggered; and S5, calculating a linkage reliability index according to the acquired real-time error rate, the linkage time delay and the image definition data, and comparing the linkage reliability index with a preset threshold value to judge whether the linkage test is qualified.
2. The method for the coordinated testing of security cameras and alarms for historic cultural relics according to claim 1, characterized in that in said step S2, the application of a controllable physical degradation to the communication link comprises in particular: Connecting a controllable line impedance simulator in series in a communication link between the alarm and the camera and converting the link impedance Z from an initial value Up to a target degradation value ; The target degradation value Calculated by the following formula: In the formula (I), in the formula (II), Representing the link impedance after degradation, Representing the initial link impedance of the link, Representing the thermal degradation coefficient of the material, is a dimensionless constant, and has the value range of ; In order to simulate the temperature of a fire, In order to be at the initial ambient temperature, The cable insulation is rated for the highest withstand temperature.
3. The method for testing the linkage of a security camera and an alarm for a historic cultural relic building according to claim 1, wherein in the step S2, the applying controllable visual masking to the field of view of the camera specifically comprises: Controllable water mist curtain wall generator is deployed in front of camera lens, and the smoke transmissivity of the visual field of the camera is enabled by adjusting the water mist concentration Reducing to a preset target value; The smoke transmittance Is a dimensionless parameter, and has a value range of Representing the proportion of the camera that is able to penetrate the smoke to obtain effective image information.
4. The method for testing the linkage of the security camera and the alarm for the historic cultural relics and architecture according to claim 1, wherein the triggering of the test event according to the time sequence inversion in the step S3 specifically comprises: At a preset first time point, starting physical degradation simulation of a communication link and vision masking simulation of a camera view; After a first preset time interval is reserved after the physical degradation simulation and the vision shielding simulation are started, activating a simulated fire source heat radiation device to enable the temperature of a test area to rise to a preset simulated fire temperature; triggering an intrusion simulation signal after a second preset time interval after the simulation fire source heat radiation device is activated, and activating the detection function of the alarm; And continuously monitoring linkage response conditions within a preset time period after triggering the intrusion analog signals.
5. The method according to claim 1, wherein in the step S4, the collected data at least includes a trigger time of the alarm, a time when the camera receives the alarm signal, a time when the camera starts recording, a real-time error rate of the communication link, and an effective frame rate of the video stream of the camera.
6. The method for testing the linkage of a security camera and an alarm for a historic cultural relics building according to claim 1, wherein in the step S5, the linkage reliability index is calculated by the following formula: In the formula (I), in the formula (II), Indicating the linkage reliability index, the value range is , The value range is that the scene normalized coefficient is , The value range is that the error rate sensitivity coefficient is , For the maximum bit error rate monitored during the test, The maximum bit error rate threshold allowed for the system is designed, For the actual linkage time delay, the time delay is the same, For the maximum linkage delay threshold allowed by the system, In order to achieve the rate of loss of image information, Is the maximum image information loss rate threshold allowed.
7. The method for testing the linkage of a security camera and an alarm for a historic cultural relic building according to claim 6, wherein the image information loss rate is as follows Calculated by the following formula: In the formula (I), in the formula (II), Representing video No The gray gradient energy of the frame, In order to be able to determine the sharpness of the image, To indicate a function, the value is 1 when the condition in brackets is true, otherwise the value is 0, and N is the total number of frames in the test duration.
8. The method for linkage testing of security cameras and alarms for historic cultural relics according to claim 6, wherein in step S5, the linkage reliability index is compared with a preset threshold value to determine whether the linkage test is qualified, and the method specifically comprises: If it is Judging that the linkage reliability of the test point in the simulated fire environment is qualified; If it is Judging that the product is unqualified, and generating an optimization suggestion; Wherein, the Is a preset linkage reliability qualification threshold value, and the value range is 。
9. The method for testing the linkage of the security camera and the alarm for the historic cultural relics and buildings according to claim 8, wherein the generating the optimization suggestion specifically comprises: When (when) Is greater than a first preset threshold value and Generating a suggestion for increasing the physical redundancy of the communication link or replacing the high-temperature-resistant cable when the physical redundancy of the communication link is smaller than a second preset threshold; When (when) When the preset value is larger than a third preset threshold value, generating a proposal for optimizing a handshake protocol of the alarm and the camera or adopting near field communication hard wire direct connection; When (when) When the detected position is larger than a fourth preset threshold value, generating a suggestion for arranging an edge image enhancement module at the camera or adding auxiliary illumination at the smoke area.

Description

Linkage test method for security camera and alarm for cultural relic ancient architecture Technical Field The invention relates to the technical field of linkage testing of historic cultural relics and buildings, in particular to a linkage testing method of a security camera and an alarm for historic cultural relics and buildings. Background At present, aiming at linkage test of a camera and an alarm in a security system of an antique building, a function verification method in a single scene is generally adopted in the prior art. The tester triggers the alarm through simulating the intrusion behavior, and then observes whether the camera can normally receive alarm signals and starts video recording, so as to judge whether the linkage function is normal. The testing method is usually carried out under the conditions of no interference, good communication link and ideal environmental condition, and is used for mainly verifying the electrical on-off and basic logic response of the security system, has simple testing flow and convenient operation, and is widely applied to daily inspection and acceptance links of various security systems. However, the existing test methods have the following technical problems: Firstly, the test scene is single, only invasion events are simulated, the fire and invasion composite risk scene possibly occurring in real disasters of cultural relics and ancient architecture is not considered, particularly, the time sequence inversion condition of 'first firing and then invasion', secondly, the test environment is too ideal, physical degradation of a communication link caused by high temperature of fire (such as rapid increase of error rate caused by increase of cable impedance) and vision shielding of smoke to the field of view of a camera are not simulated, the test result cannot reflect the real linkage reliability of the system under extreme working conditions, finally, the existing test method lacks quantitative evaluation indexes of linkage performance, cannot quantitatively judge the system reliability under the multi-factor coupling effects of degradation of the communication link, increase of linkage delay, image information loss and the like, and failure reasons are difficult to be positioned in a targeted manner and optimization suggestions are generated. Disclosure of Invention In order to solve the problems in the related art, the invention provides a linkage test method for a security camera and an alarm for a cultural relic ancient building. In order to achieve the above purpose, the invention adopts the following technical scheme: a linkage test method for a security camera and an alarm for a historic building of a cultural relic includes the following steps: S1, selecting a test area, and collecting and recording initial state parameters of a communication link and initial state parameters of a camera view; step S2, simulating a fire environment, including applying controllable physical degradation to the communication link to simulate the destruction of a high Wen Duixian cable, and applying controllable visual masking to the camera field of view to simulate smoke masking; Step S3, triggering a test event according to a time sequence inversion mode, namely firstly starting the simulation of the fire environment, and triggering an intrusion simulation signal after the simulation of the fire environment reaches a preset condition; step S4, continuously collecting real-time error rate of the communication link, linkage time delay between the alarm and the camera and image definition data of a video stream of the camera after the intrusion analog signal is triggered; and S5, calculating a linkage reliability index according to the acquired real-time error rate, the linkage time delay and the image definition data, and comparing the linkage reliability index with a preset threshold value to judge whether the linkage test is qualified. Optionally, in said step S2, applying a controllable physical degradation to the communication link specifically comprises: Connecting a controllable line impedance simulator in series in a communication link between the alarm and the camera and converting the link impedance Z from an initial value Up to a target degradation value; The target degradation valueCalculated by the following formula: in the formula, Representing the link impedance after degradation,Representing the initial link impedance of the link,Representing the thermal degradation coefficient of the material, is a dimensionless constant, and has the value range of;In order to simulate the temperature of a fire,In order to be at the initial ambient temperature,The cable insulation is rated for the highest withstand temperature. Optionally, in the step S2, the applying a controllable visual mask to the field of view of the camera specifically includes: Controllable water mist curtain wall generator is deployed in front of camera lens, and the smoke transmissivity of the visua