Outreach / Video Quality Resources / Tools for Public Safety / Guide to Defining Requirements / Generalized Use Class Aspects

Guide to Defining Video Quality Requirements

Jump To: Use Cases | Use Classes | Generalized Use Class Aspects | Usage Timeframe | Discrimination Level | Target Size | Motion | Lighting Level | GUC Questionnaire

Revised May 29, 2012
Section 2 of 9 of step 2 -- Generalize Use Cases into Use Classes -- in the bar chart highlighing the 4-step process for definfing video quality requirements.

Generalized Use Class Aspects

Generalized use class aspects.
For each use case, determine the specific value for each aspect. The combination of common values across use cases will form your generalized use classes.

A use class shares certain important aspects of specific use cases that are common to other use cases, allowing you to make generalizations between them. All use cases have an analyst and a scene under observation. For each of your use cases, apply the Generalized Use Class Questionnaire to derive generalized aspects from the analyst’s intended use of the video (Use Characteristics) and what is in the scene under observation (Scene Content).

Each of the following generalized use class aspects can impact the quality of the video content as seen and used by the analyst. Click any of the following generalized use class aspects or those in the figure for aspect information.

Use Characteristics

Scene Content