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Imaging Background
Overview
Two aspects of imaging are most important in understanding and optimizing 3VR facial surveillance:
1. Resolution
2. Field of view
Without understanding the impact of these two aspects, it will not be possible to master use of 3VR for either im
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porting images or capturing video. As such, prior to analyzing facial surveillance or its application to 3VR, these
aspects shall be explained and relevant introductory material shall be presented.
Resolution
Resolution, as applied to images used in the 3VR system, is defined as the level of visual detail in the image.
Resolution is commonly defined in two dimensions: horizontal and vertical. For instance, a frequent resolution
level cited is 640 x 480 pixels. This means that there are 640 unique pixels across the image horizontally and 480
pixels down the image vertically.
The number of horizontal pixels is important for performing 3VR facial surveillance because it determines the
amount of detail available for performing facial analysis. Sufficient horizontal pixels are required to perform facial
recognition.
One standard metric used in describing video surveillance images is the Common Intermediate Format (CIF). This
is a way to quickly cite specific resolution levels that are commonly used in digital video. CIF specifies specific
horizontal and vertical resolution levels. The table below provides examples of different CIF levels.
QCIF (Quarter CIF)
176 x 44
CIF
352 x 288
Typical Internet streaming
2CIF
704 x 240
4CIF
704 x 576
NTSC camera max resolution
16CIF
1408 x 1152
1.5 Megapixel camera
CIF Level
Resolution
Example
Summary of Contents for P-Series SmartRecorder
Page 4: ...4...
Page 9: ...Product Diagrams M Series SmartRecorder Front view Back view Product Diagrams 9...
Page 10: ...10...
Page 31: ...Chapter 1 Installing a 3VR SmartRecorder 31...
Page 32: ...32...
Page 47: ...Chapter 2 Configuring a 3VR SmartRecorder 47...
Page 48: ......