Expo digital DVR application analysis and testing methods (1)

Digital hard drive short DVR, VCR has been widely used in the security field.

Due to its use of the environment and different purposes, DVR, appearance, from the kernel configuration is in constant development, is derived from a wide range, features of DVR, DVR main can be divided into gongkongshi and embedded DVR.

DVR is a set of image storage processing computer system with an image/voice long video, audio, remote monitoring and control capabilities, its collection a video recorder, screen divider, lens pan/control, alarm control, network transmission, such as five, use one of the devices will be able to replace the analog surveillance system capabilities of many devices, but also gradually in price.

It is a digital recording technology, image processing, image storage, retrieval, backup and network delivery, remote control is much better than analog monitoring equipment, represents television monitoring system development direction, is currently on the market of TV monitoring system.

Popular products on the market have DVR PC platform and embedded DVR, the DVR in stability, reliability, ease of use, and so has the advantage of "professionalization", embedded DVR will progressively encroached on PC DVR market.

PC DVR in General, you can take advantage of the expansion of the network video monitoring system is still affordable management host role, still has its own market share.

Dedicated DVR application at Expo

2010 Shanghai World Expo is the Beijing Olympics, China is an international event in the attention of the world.

With the Expo-related infrastructure, construction, facilities and operations support the smooth progress of the work, the Shanghai World Expo in security issues, is increasingly becoming the focus of attention of the community.

Shanghai World Expo held in a time span of 6 months, in accordance with the planning, the construction area is about Expo area 5.28 square kilometers.

Planning a National Museum in China, foreign national museum, theme restaurant, business center and major performing arts centres, through more than one ground, water and rail entrances and external area connection. Based on an analysis of the characteristics of the Shanghai World Expo, the General environment using digital hard disk recorders have difficulty meeting the actual needs of the Shanghai World Expo, hence the need for existing digital hard disk recorders for retrofit and upgrade, the application will be built to meet the Expo, meet a range of special requirements of the digital video recorder called Expo dedicated digital video recorder.

Expo dedicated DVR and the distinction between conventional DVR and detection method

Based on the GB 20815-2006 video surveillance digital video device "is defined in A class II class DVR, World Expo Coordination Council on this Expo area security project of the Expo dedicated DVR defined following a series of technical requirements.

Horizontal resolution

TV monitoring system, the sharpness is a measure of system image quality is good or bad for the main parameter, and the clarity of the mainly reflected in the horizontal resolution.

This Expo dedicated DVR on image monitoring and playback the clarity of the indicators required relative to past DVR more stringent and demanding. Monitor the State of the horizontal resolution and playback status level of resolution, the technical requirements are: monitoring status level resolution ≥ 400 TV lines horizontal resolution; playback status more than 350 TV lines.

Detection method: standard video signal generator for more complex signal input channels and recording, Visual surveillance state and playback status monitor image in the horizontal resolution.

The number of frames (frequency) (frame/s)

Expo dedicated to every road in DVR 25 fps frame rate for image recording, should be the same or higher horizontal resolution and image quality to 2 FPS frame rate for video recording.

According to the China Shanghai World Expo 2010 Park temporary exhibition venues and surrounding facilities security and protection engineering basic requirements and procedures, required system time based on venue operation, set the 24-hour real-time or motion detection video image recording, recording the number of frames is not less than 25 frames/sec; at the same time, the temporary exhibition hall entrances should also have 2 frames per second continuous automatic image capture records.

Detection method: two digital frequency/counters are set to: frequency generator (25 Hz) and a counter (in millisecond fired the timing).

The frequency generator output input to counter that counts, and an external synchronization signal at the input to the camera and the camera at the same frequency generator, intake frequency generator and the display data on a counter, through video distributor entered into the channel, for the record. Native frame-by-frame playback, statistical and record 3 seconds of recording frame count, repeated 3 times the average calculated per second. With 25 fps frame rate and to 2 FPS frame rate on image logging of test you want.

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