IP MEGAPIXEL CAMERA
IP camera usually means Internet protocol camera. It is a digital camera which is essentially used for surveillance. Therefore, it sends and receives data through computer and internet. Most of the camera use webcam but internet protocol camera are only for the surveillance users.
Two types of IP cameras are there namely Centralized IP camera and Decentralized IP camera. Centralized IP camera requires a network video recorder (video, alarm) and decentralized IP camera does not need network recorder (flash drives, hard disk drives).
The largest trend in video surveillance today is the move from analogue cameras to IP cameras. While all surveillance cameras are digitized to view and record on computers, only IP cameras digitize the video inside the camera. More importantly, IP supports megapixel while analogue does not. This is rapidly driving the adoption of IP within the professional market.
ADVANTAGES OF IP CAMERA
- IP cameras offer higher resolution than analogue cameras. IP cameras are digital end to end. Megapixel IP cameras give you high resolutions 1.3MP to 20MP images at up to 30 frames per second (real-time video).
- Two-way audio via a single network cable allows users to communicate with what they are seeing
- Transmission of commands for PTZ (pan, tilt, zoom) cameras via a single network cable.
- PoE – Power over Ethernet: Modern IP cameras have the ability to operate without an additional power supply. They can work with the PoE-protocol which gives power via the Ethernet cable.
- Flexibility: IP cameras can be moved around anywhere on an IP network (including wireless).
- Distributed intelligence: with IP cameras, video analytics can be placed in the camera itself allowing scalability in analytics solutions
- Remote accessibility: live video from selected cameras can be viewed from any computer, anywhere, and also from many mobile smartphones and other devices. Remote accessibility also prevents police officers from confiscating video and audio evidence that you can use against them
- IP cameras are easy to use. Can you use a computer mouse/keyboard? If so, then you can manage IP camera software.
- Cable cost for IP cameras is lower than that for analogue cameras. Analogue cameras can require up to 4 cables – video, audio, power, and/or data for each camera. IP cameras however can use single CAT5 cable for all 4. In most cases, network cable is probably already wired throughout your building (for the existing network that is in place).
- IP video systems can be easily set up to store video at multiple remote locations for security against disasters and/or theft.
IP video provides crisp resolution for every frame enabling effective recorded video/images for investigative purposes.
The CCTV industry is all abuzz with talk of an IP (“Internet Protocol”) camera takeover. Yet reports of the death of analogue cameras are premature. While some IP or ‘network’ cameras can potentially deliver high definition megapixel images, analogue CCTV cameras continue to offer greater efficiency, lower cost and higher overall reliability.
An analogue surveillance camera begins with a CCD sensor and then digitizes the image for processing. But before it can transmit the video, it needs to convert it back to analogue so it can be received by an analogue device, such as a video monitor or recorder. Unlike IP cameras, analogue have no built-in web servers or encoders and require no technical maintenance. These functions are implemented in the recording and/or control equipment.
Unlike HD-SDI or HDCVI system which also over the coax system, the main difference is in the DSP interface. HD-SDI and HDCVI can transmit at speeds of up to can transmit data up to 2.97 gigabit of data, while analogue transmit at signal with up to 270-325 megabits of data.
ADVANTAGES OF ANALOGUE
- Analogue CCD cameras perform well across a variety of lighting conditions and manage motion well.
- Analog cameras and peripheral equipment are significantly lower in price to their IP counterparts.
- Analogue cameras do not have capabilities above the NTSC/PAL standards, although now there are analogue cameras that utilize CMOS sensors with 1200 TV lines (1.3 Megapixel).
- As analogue compresses the video in the DVR there are more hardware and software resources available to provide increased video quality and frame rate.
- Analogue cameras are unmanaged devices. No IP address to manage, no worries about programming, software, IT skills, etc. It either works or it doesn’t. Once installed, they require no “skilled” maintenance, if any.
- Analogue video traffic is not subject to any networking issues or risks. The bandwidth is virtually unlimited. It is a passive connection, similar to an analogue telephone connection, and cannot be interfered with due to problems external to the video surveillance system
- Analogue devices are limited to failures of the individual cameras or the individual devices at the point of concentration and as such the loss of a single piece of hardware will not cause a substantial degradation of the system.
- The video transmission is typically a “passive” connection, and once installed, requires virtually no maintenance. Analogue cameras are very mature and have a long track record for reliability.
HD-SDI & HD-CVI
HD-SDI (High Definition Serial Digital Interface) is a newer kind of video interface run by SMPTE (Society of Motion Picture and Television Engineers) and an upgrade to the current SD-SDI (Standard Definition Serial Digital Interface). An HD-SDI camera allows you the ability to have megapixel in a standalone DVR. Only recently has this technology been incorporated into the CCTV industry, HD-SDI cameras are not limited by bandwidth and offers a very smooth unbuffered realtime video
HDCVI (High Definition Composite Video Interface) is an over-coaxial-cable analog HD video transmission standard which developed in-house by Zhejiang Dahua Technology Co., Ltd. The technology renders two HD video formats—1080P (1920×1080) & 720P (1280×720) by progressive scanning.
As the cameras uses the same coaxial cables as analogue cameras, this makes the upgrading from analogue cameras to Megapixels cameras seamless and cost effective without having to re-cable the whole system.
HDCVI cameras have a further advantage of supporting longer cable runs on RG-59 coaxial cable for up to 600 meters for 720P cameras and 400 meters for 1080P cameras.
ADVANTAGES OF HD-SDI & HDCVI:
- Seamless upgrade from analogue camera to HD camera without re-cabling at half the cost of IP cameras.
- Megapixel & uncompressed image quality —1080P (1920×1080) & 720P (1280×720)
- Long cable run & non-latency reliable video transmission without additions of boosters.
- Strong anti-interference capability & solid interface protection. Free of high-frequency electromagnetic interference; constant signal transmission and display without frame drop and signal loss.
- HDCVI composites video, audio and PTZ signals together and have them transmitted over coaxial cable.
- Two-way data transmission.