What are the acceptance criteria for video surveillance?
The selection of equipment, components and materials of the system shall comply with the following provisions:Products that conform to the current national and trade standards shall be adopted;The system adopts the video input and output impedance of equipment and components, and the characteristic impedance of the cable shall be 75 ohmsThe input and output impedance of the device shall be high impedance or 600 ohms;The performance and technical requirements of various equipment used in the system shall be in harmony and consistent with the price list.The image quality may be evaluated according to the five stage damage system, and the image quality shall not be less than 4. (see table in detail)The level of image resolution should not be lower than 400 lines for monochrome television systems. Color TV systems should not be less than 270 lines;
1, the camera should be installed in the vicinity of the surveillance target, not vulnerable to external damage, the installation site should not affect the field equipment operation and normal activities of personnel. Installation height, indoor should be 2.5 to 5M away from the ground; outdoor should be 3.5 to 10m away from the ground, and not less than 3.5m.2. The camera in the elevator shall be installed at the top of the elevator car and at the opposite corner of the elevator operator and shall be able to monitor the inside of the elevator compartment.3, the camera lens should avoid direct glare, to ensure that the camera tube target surface without damage. There shall be no object in sight field of view.4, the camera lens from the light source direction of alignment monitoring target, and should avoid light installation
The design of the system shall be determined according to the following factors:According to the technical and functional requirements of the system, the system composition and equipment configuration are determined;Determine the location of cameras and other equipment according to the construction plan or field survey;According to the surveillance target and the condition of the environment, determine the camera type and protective measures;According to the camera distribution and environment conditions, the routing of transmission cable is determined.
