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AXIS Exam Prep (Terms (OUI Organizational Unique Identifier - Issued by…

- - - - Double the distance removes four times the lux, have to add it back to keep image lit
  - - - Made of Germanium
  - - - Depth of field - The area in front of and behind the focal point that remains in focus.
        
        IRIS and Focal Length determine depth of field
        
        Higher focal length=shallow DOF (zoom)
        
        Smaller focal length=Deep DOF
      - F Stop - Low F stop the larger the aperture=more light
      - Barrel Distortion (fish eye effect)
        
        Shape of a lense causes this
        
        Barrel distortion correction (Q Series)
      - Pin cushion distortion
        
        opposite of barrel distortion
    - - objects same size as human perspective
    - - Fixed
      - Verifocal
      - Zoom
    - - Fixed Iris
      - DC Iris
        
        Automatic, not as precise as P-Iris
      - P-Iris
        
        Precision Iris, uses stepper motor and image to adjust the iris - about 100 steps to avoid light refraction (automatic as well)
    - - Fail to focus all colors to same convergence point
      - Seen as fringes of color along dark and bright boundaries
      - Reduced by lens materials like flourite or combine 2 or more different lens materials
  - - - CCD Charged Coupled device - Being phased out. Was good for VGA
      - CMOS Complementary Metal Oxide Semiconductor
- - - - VFAT is default but EXT4 is recommended
- - - - Forensic Capture
      - Dynamic Contrast
      - Dynamic Capture
- - - - Frame Rate
      - Image Quality
    - - Target bit Rate
  - - - H.264 handles compression better but there is latency
- - - - 75 OHM is required for coaxial termination to prevent RF signal from being reflected back to the source.
      - RG 59 is most popular cable.