Outreach / Video Quality Resources / Tools for Public Safety / Guide to Defining Requirements / Video System Tasks

Guide to Defining Video Quality Requirements

Jump To: Use Cases | Use Classes | Generalized Use Class Aspects | GUC Questionnaire | GUC Example | Video System Tasks | Video System Functions | Acquire Video | Deliver Video | View Video | Video System Functions


Revised May 29, 2012
Section 1 of 11 of step 3 -- Understand System Tasks and System Functions -- in the bar chart highlighing the 4-step process for definfing video quality requirements.

Video System Tasks

Three fundamental tasks provide the foundation for any basic video system. Each task includes functions requiring equipment that has a direct effect on the quality of the video, which means each piece of equipment has the potential to alter the video to a degree that impacts the video’s usability.

Full video system illustrating three core functions: acquisition, transmission, and display.
The Acquire, Deliver, and View tasks each include functions. Click a task or function in the figure for information.

The figure provides a reference model for core system functions, which support three primary tasks:

  • Acquire Video — Includes focus and capture functions, and may include a built-in CODEC, which can perform the processing function’s encoding/decoding operations. However, in some video systems, such as those used for surveillance applications, the encode operation might be performed in a separate IT space.

  • Deliver Video — Includes the processing, storage, and transport functions. Sometimes the acquire and view tasks include the processing function’s encoding/decoding operations.

  • View Video —Includes the display function and may include a built-in CODEC, which can perform the processing function’s decoding operation. However, in some video systems, such as those used for surveillance applications, the decode operation might be performed in a separate IT space.

The exact demarcation for each of the three tasks can vary from application to application due to integration of various functions within your equipment.