Camera Aperture
Camera Aperture
Technical Article: Test And Use of Surveillance Camera in CCTV technology - Security Industry
On the face of many video camera Product the user that the method used to monitor the camera test? Article for you on their sanity.
Surveillance testing procedure and use of
Major test test security cameras clarity and color grade, illumination, backlight, followed measure its cameras Distortion, power consumption, low voltage, after the first of clarity and color reproduction, and lighting, backlight introduces the first measurement step.
1. Definition of measurement: testing multiple cameras should be used when the same Shot (Recommended to be fixed focus, 2 variable lens), to test the card center circle on the left and right side of the screen display, have reservations, clear and accurate count has been to put the extent of vertical lines 10 and 10 Group level. Represents the level of vertical resolution and clarity, and therefore has got a set of lines. 800 350 lines of horizontal and vertical lines, so the best black and white screen. Test Material in sight focus, there may be a focus page edge detector. Preferably both, can see the difference in this camera (on the far and near convergence).
2. CCTV color reduction test: test this parameter should be selected for color monitors. First remote observation figure, clothing, see if the color distortion, have bright contrasting objects see responsiveness surveillance cameras, surveillance cameras take color pictures on the front, the screen more clearly outline the extent too easy or too thick, re-colored objects in response to move the camera to see if the color smearing, delay, fuzzy, etc.. Test conditions mostly on behalf of the lighting in this video should be in the 50 +10 V 50V, measured under illumination, each camera on the basis of the best on behalf of illumination plus 10 volts and the aperture should be kept near State.
3. Lighting: CCTV cameras will be placed in a dark room, dark room from before and after the active 220V incandescent lamp, to a fine set voltage regulator regulate voltage and high voltage regulator to regulate the formation of a dark room with light shade, the voltage from 0V transferred to 250V. Indoor lighting adaptable to most clearly from the dark, the camera aperture testing is open to the maximum brightness when shooting most value (the active light weakly with regulator to not see the dark room built-in screen), then played for the smallest aperture, and then record the value of one of the most illumination can also be indicated before and after the lights were turned off regulator.
4. Surveillance Camera Backlight Compensation: There are two ways to test this argument: one is in a dark room, front of the camera turns on the light side of the controller when it is transferred to the brightest, and then placed in the light of an image or text below to meet light camera camera to view 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 second is the case in the sunny window, according to the camera, this time to see pictures and text can see clearly.
5. Surveillance Camera Distortion: Distortion of surveillance cameras watch the test card placed in front of the camera so that the entire area displayed on the screen to see if the oval spherical, the camera, see whether the extended circle center, and then distance test side, angle, arc-shaped frame with or without distortion.
6. Cameras current: minimum voltage, use a multimeter to measure current, use a small adjustable voltage regulator to see.
Safety Prevention System, Images are mainly from the current generation of CCD cameras, CCD is a charge-coupled device (chargecoupleddeice) card, it can be light in electric charge and charge storage and transfer, it can be stored without charge voltage occurs change, so is the ideal camera components consisting of CCD camera with its small size, light weight, Institute for the magnetic field effect in seismic properties in the East and the impact has been widely used.
CCTV use common sense
Surveillance Cameras is to obtain live images of the front end device to area array CCD sensor core components, plus the synchronization signal generation circuit, video signal processing circuit and power supplies.
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