Risoluzione – megapixel vs TV lines
We are glad to write the addition of a new frequency asked question article, this time giving a little clarity to what difference between TVL and megapixel, how TVL measurements compare to pixel meassurements in PAL, NTSC and IP CCTV systems.
For conventional video surveillance cameras, they are analog cameras which output analog TV signals. Accordingly, TV line is used to refer the image resolution that the camera can capture. The resolution of image mainly depend on equipped CCD/CMOS image sensor. Based on different CCD/CMOS image sensor, analog camera can deliver standard resolution video with 700TVL, 650TVL, 480TVL, 420TVL etc. Higher […]
How to choose right power supply for video surveillance camera?
It’s undeniable that power supply is crucial important to your video security cameras. For ensuring the stability and reliability of your video surveillance system, installers and users should choose high quality power supply. Poor quality power supply can lead to image distortion, flickering, even damage of security camera hardware. Typically, outdoor security cameras utilize 12V DC power supply, and PTZ cameras use 24V AC power supply, some security cameras may use 220V AC power, 5V DC power supply is widely used in indoor security cameras.
Power adapters or distribution boxes?
All security cameras require some sort of power source. Power distribution boxes and […]
How to install analog HD cameras (AHD, CVI,TVI)?
Do you still use analog cameras? Today, Analog HD cameras are very cost-effective, no matter they are AHD, HDCVI, HDTVI cameras from different manufacturers, in this article, we are pleased to share a tutorial that guides you to install analog HD cameras. This tutorial originally come from user manual content of Qsee cameras. Please keep in mind that AHD cameras only work with AHD DVR, likewise, HDCVI cameras work with HDCVI DVR and HDTVI cameras work with HD-TVI DVR. All these analog HD products based on different technology can’t be compatible each other. If you are upgrading from a standard Analog […]
Security camera basics: motorized zoom lens vs manual varifocal lens
Today, security camera manufacturers can provide HD security cameras come with motorized zoom lenses. Compared with the conventional manual vari-focal lens, a camera has the motorized zoom lens can automatically adjust the focal length of camera to get clear auto focused image. This makes security camera installation become much quicker and easier. Additionally, the motorized zoom lens can be controlled through Zoom/Focus buttons on web interface, smartphone App, or even the Joystick PTZ controller (RS485).
What is the advantage of motorized zoom lens?
If the video surveillance projects require installing multiple security cameras, choosing the cameras equipped with motorized zoom lens can significantly reduce […]
Che cos’è Video Balun?
A Video Balun enables the transmission of video using unshielded twisted pair wire instead of coaxial cable. The word “balun” comes from combining the terms balanced and unbalanced. The function of a balun is to transform an unbalanced signal into a balanced signal. When video signal is transmitted through coaxial cable, the distance traveled by the signal is limited because the signal is in the form of an unbalanced signal that is susceptible to Radio Frequency Interference or noise. Coax cable incorporates special shielding to minimize noise.
Video Baluns transform the video signal into a balanced form in which each wire […]