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 […]
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 […]
How to calculate the storage size for AHD/HDCVI/HDTVI DVR?
No matter you want to use an IP camera system or a HD camera system, you have to use HDDs for video storage, here comes the question – how many HDDs should the system use? what the capacity size of the HDD should be used? Installers or end-users need to estimate the required storage size according to the time length that the system should keep the video footage. Additionally, sometimes the cost of one piece HDD is equivalent to the entire cost of camera system, hence we don’t want to waste money on HDDs.
1# How to calculate the storage size?
To estimate or calculate […]
Installazione Telecamere – Protezione dai fulmini
Lightning strikes and voltage surge will damage everything, it’s the devastating blow to your security camera systems. Lightning/surge protection is essential when installing the video surveillance systems, especially the outdoor cameras are prime targets for lightning strike. Although most majority CCTV equipment features standard lightning/surge protection, you still need to have extra measures to protect the system from lightning strikes.
How to protect your camera system from lightning?
- All the equipment should be properly grounded to the building’s structural steel as close to the equipment as possible.
- Don’t use individual power supplier for cameras, using a power distribution box with circuit […]