Mpeg Cctv Installations

We encounter the video compression standard MPEG everywhere particularly in the consumer sector. Internet, DVD, digital television or digital camcorders, motion images of any kind are compressed using the MPEG standard. Consumer applications mainly focus on replay and transmission of MPEG-compressed video films. The calculating time needed for generating a high-quality and strongly compressed video sequence is irrelevant. When rewinding or displaying freeze images, time lags or jumping’s are accepted. Solely a high compression rate allowing quickly transmitting and replaying the video film is of importance.

Just different for applications in video surveillance systems (CCTV).
The main focus is placed on real-time compression, high picture quality with preferably large compression rate, low bandwidths and storage costs, short latencies when transmitting live images and ideal replay mechanisms.
The currently available multimedia encoders are not suited for such applications.

Picture formats:
For each GeViScope media channel the requested picture format can be adjusted separately for permanent or event-triggered recordings:

A smaller picture format results into a proportionally smaller picture file size after compression.

One camera picture (frame) consists of two fields. At any one time GeViScope records one field and transmits the second field into the network. This separate processing allows live recordings with up to 25 fps (fields per second) and parallel live transmissions in the network with up to 25 fps per video channel (network matrix). The latency time for MPEG4CCTV transmissions is very low and amounts to
VFR – Variable Frame Rate
The picture rate for permanent recordings and event-triggered recordings can be adjusted variably. The adjustment range goes from live (25 fps) up to time-lapse recordings with for example 1 picture / 10 s.

The GeViScope Dual Sensor (GSC/Dual-Sensor) combines Video Motion Detection (GSC/VMD) with intelligent Video Analytics (GSC/VA-Class) in one system

The most important features of GSC/VMD:
128 VMD zones are freely definable in function, position, size and sensitivity
Measure cycles of up to 40 ms to 10 s for real time detection of very fast and very slow motions
Three-dimensional field adaptation via special perspective function
Algorithm for diversification between local and global changes in the picture
Collection and evaluation of direction and speed
Vector function can be switched on

The most important features of GSC/VA-Class:
Intelligent real-time analysis of video data
64 areas of interest / areas of non-interest
Classification of persons and cars plus their  characteristics as for example speed, size, direction and
status (fast, slow, in motion)
Three-dimensional detection of object size by parameterizable reference lines (definition of real distances in the picture)
Motion Tracking
Detection of abnormal activities and security-relevant situation
Automatic tracking of moving  persons
Video Motion Detection (GSC/VMD) and Intelligent Video Analytics (GSC/VA-Class) run on one video channel each. Each system is parameterized separately and reports separately any activity in the video picture to the Dual Sensor analytics. A Dual-Sensor alarm is only generated if both systems (AND gating) report a detected motion simultaneously (in a time period to be set).