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VQiPS: Target Size

Guide to Defining Video Quality Requirements

| Getting Started | Use Cases | Use Classes | GUC Aspects | Usage Timeframe | Discrimination Level | Target Size | Motion | Lighting Level | GUC Questionnaire |

VQiPS: Use Classes

Target Size

Specifies the size of the object of interest with respect to the field of view.

Target Size: Large Task
Target size example: Large Task: Vehicle identification

Target Size: Small Task
Target size example: Small Task: Facial recognition

The size of the region of interest (target) with respect to the size of the field of view directly affects the ability to recognize that target when the camera is at its maximum optical zoom. The larger the target, the more details can be discerned.

The perceived target size is dependent on the actual target size, its distance from the camera, and the camera’s field of view. As a basic concept, targets can be classified as large or small, as the figure shows. However, the VQiPS working group is developing measurements to more precisely define target size.

Scene Content
Consider: What is the size of the object of interest with respect to the field of view?

Scene Target SizeContent
LargeThe target occupies a large percentage of the frame
SmallThe target occupies a smaller percentage of the frame

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Created September 30, 2016, Updated December 5, 2016