AS NZS 62676.1.1:2020 pdf free.Video surveillance systems for use in security applications Part 1.1: System requirements一 General (IEC 62676-1-1:2013, MOD).
4.2.2 Image capture
The purpose of image capture is to generate and deliver an image of the real world in a
format that can be used by the rest of the VSS.
The purpose of image capturing is to generate an image of the scene for later processing by the VSS. An image source captures an image of the scene, creates image data and delivers that data to the image handling functionality using the system interconnections. The image data can be in analogue (e.g. composite video) or digital (e.g. JPEG, MPEG-4) format.
4.2.3 Interconnections
Interconnections describe all transmission of data within the video environment. This includes two functions: connections and communications.
The communications describe all video and control data signals, which are exchanged between system components. These signals may be analogue or digital.
Connections cover the media used for the communication signals. Examples of connections are cables (e.g. twisted pair, coaxial or optical fibre), digital networks, wireless transmission as well as equipment e.g. a multiplexer or video matrix.
A VSS can be divided into components that are communicating through interconnections, which are not dedicated to the VSS. An example is a network which is shared with other applications.
4.2.4 Image handling
4.2.4.1 General
The functions of image handling include analysis, storage and presentation of an image or a sequence of images. The same functions can also be applied to other data (e.g. audio stream) and meta data. A VSS does not necessarily contain all of these functions.
Image handling can be performed by one or several devices that make up the VSS (e.g. monitors, recorders, image analysers, intelligent cameras and remote workstations). One device can also handle several image handling tasks (e.g. digital video recorder).
During image handling the images may be changed e.g. in resolution, image rate and compression.AS NZS 62676.1.1 pdf download.