subject: Technical article: test and application of surveillance cameras in the knowledge - surveillance cameras, technology - Security Industry [print this page] Technical article: test and application of surveillance cameras in the knowledge - surveillance cameras, technology - Security Industry
The face of many Video camera Product, the user that the method used to monitor the camera test? Article to you on their common sense.
Surveillance camera test procedure and method of use
Major test test surveillance cameras clarity and color reproduction of degree, illumination, backlight compensation, followed measure of its surveillance cameras Distortion, power consumption, low operating voltage, the following first of clarity and color reproduction, and illumination, backlight compensation first introduce the measurement steps.
1. Definition of measurement: testing multiple surveillance cameras should be used when the same Shot , (Recommended to be fixed focus, 2 variable lens), to test the card center circle in the left and right side of the monitor screen, subject, clear and accurate count has been to set the scale of vertical lines 10 and 10 Group level. Represent the level of vertical resolution and clarity, and accordingly has been given a set of lines. 800 350 lines of horizontal as vertical lines, then the best black and white monitor. Test materials in vision focus, focus can be side edge detector. Preferably both, can see the difference in this camera (on the far and near convergence).
2. Surveillance Camera color reduction of the test: test this parameter should be selected for color monitors. First remote observation Figure , Clothing, see whether the color distortion, get bright contrast objects, see responsiveness surveillance cameras, surveillance cameras take color pictures on the front, watching the screen more clearly outline the extent, too light or too thick, re-colored objects in response to movement to camera, to see whether the color smearing, delay, fuzzy, etc.. Test conditions the most on behalf of the illumination in this video should be in the 50 +10 V 50V measured under illumination that every surveillance camera on the basis of the best on behalf of the illumination plus 10 volts, and the aperture should be kept closest to the state.
3. Illumination: surveillance cameras will be placed in dark room, dark room from before and after the active 220V incandescent lamp, a fine set voltage regulator to regulate voltage and high voltage regulator to regulate the generation of a dark room with light shading, the voltage from 0V transferred to 250V. Indoor lighting can be adjusted to most clearly from the dark, the camera aperture testing are open to the maximum illumination when recording the most value (the active lights dim with the regulator to not see the dark room built-in screen) then play to the smallest aperture and then record the value of one of the most illumination can also be specified before and after the lights were off regulator.
4. Surveillance Camera Backlight Compensation: There are two ways to test this argument: one is in a dark room, the front of the camera turns on the light side of the regulator, when transferred to the brightest, and then placed in the light of a picture or text below , to meet light camera surveillance camera to see images and text can see, the screen is not glare stabbed, and adjust the AL, AX pull switch file to see whether changes in what was the best. The other is the case in the sunny window according to the camera, this time to see images and text can see clearly.
5. Surveillance Camera Distortion: Distortion of surveillance cameras watching the test card placed in front of the camera so that the whole sphere appears on the screen to see whether the oval spherical, the camera forward, to see whether the enlarged circle center, and then distance test side, angle, arc-shaped frame with or without distortion.
6. Surveillance cameras power consumption: minimum operating voltage, use the multimeter to measure current, use a small adjustable voltage regulator to see.
Security Prevention system, the images are mainly from the current generation of CCD cameras, CCD is a charge-coupled device (chargecoupleddeice) short, it can be the light into electric charge and charge storage and transfer, the charge can be stored out of the voltage occurs change, so is the ideal camera components, consisting of CCD camera with its small size, light weight, the Department of the magnetic field effect, with seismic characteristics of the East and the impact has been widely used.
Surveillance camera use common sense
Surveillance camera is to obtain live images of the front end device, to area array CCD Image Sensor The core components, plus synchronization signal generation circuit, video signal processing circuit and power supplies.
