Application and Development of Surveillance Cameras

Surveillance cameras are used as security cameras. Their pixels and resolution are higher than those of computers. However, they are not able to catch up with professional digital cameras or DVs. The surveillance camera is just a single video capture device and it does not have data storage capabilities.

Surveillance camera application principle

In surveillance cameras (NEW: remote camera) security system, image generation is currently mainly from CCD cameras. The CCD is an abbreviation for a charge coupled device. The CCD camera constituted by the CCD camera is widely used due to its small size, light weight, freedom from magnetic fields, and resistance to vibration and impact.

The image of the subject is focused on the CCD chip through the lens. The CCD accumulates a corresponding proportion of charge according to the light intensity. The charge accumulated by each pixel moves outward point by point under the control of the video timing and is filtered and amplified. Video signal output. The video signal is connected to the video input of a monitor or television to see the same video image as the original image.

Surveillance camera development history

As of today, the development of surveillance cameras in surveillance equipment can be roughly divided into three stages:

The first phase: the late 1970s to the mid-1990s. This stage is mainly based on closed-circuit television monitoring system (CCTV), which is the first generation of analog television monitoring system.

The first generation was VCR (VideoCassetteRecorders) cassette video recorders. A video recorder (or VCR for short) is a video recorder with an active video cassette. The tape contains a tape for recording the sound and video of a television broadcast program for later playback. In about 2000, it was basically eliminated and replaced by a DVD player.

CCTV monitoring system is an important part of the security technology prevention system. It is an advanced comprehensive system with strong prevention capability. It can be monitored directly by remote-control cameras and their auxiliary equipment (lenses, heads, etc.) All the conditions of the site can also be linked with anti-theft alarm systems and other security technology protection systems to make it more powerful. The technical requirements of the CCTV surveillance system are mainly: the definition of the camera, the transmission bandwidth of the system, the signal-to-noise ratio of the video signal, the format of the television signal, and the camera. Its transmission medium is a video cable. The simulation is handled by the control host. Mainly used in banks, government agencies and other high-end places.

The second phase: From the mid-1990s to the end of the 1990s, mainly based on PC card-based video surveillance systems, this stage is also known as the semi-digital era in the industry.

Its transmission medium is still a video cable. Digital processing and storage by the multimedia control host or DVR. The application of this stage is also limited to places with higher requirements for safety. The second-generation DVR (Digital Video Recorder), which is a digital video recorder, uses a hard disk recording instead of a traditional cassette tape and is often referred to as a hard disk recorder.

DVR adopts digital recording technology and is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission, remote control, etc. DVR represents the development direction of TV monitoring system and is a TV on the market. The preferred product of the monitoring system. Generally divided into: hard disk recorders, PC-type hard disk recorders, embedded hard disk recorders and so on.

The third stage: Since the late 1990s, relying on embedded technology, network and communication technology as platforms, and online video surveillance systems featuring intelligent image analysis as the mainstay, since then, the development of network video surveillance has also entered. Digital Age.

The application of network video surveillance is no longer limited to security protection. It has gradually been used in remote offices, telemedicine, and distance learning. To the third generation - network video surveillance systems, also known as IP surveillance systems.

Whether it is a security solution consisting of an analog camera plus a video server, a security solution consisting of a network camera alone, or a security solution that consists of a combination of the two, IP monitoring has proven to be an attractive option. Security solutions. In more and more original industry applications, this revolutionary technology is gradually replacing the traditional monitoring system, which further reduces the cost while improving security. In many new application areas, it is still the first Once used, it has created and inspired many new markets.