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An Assessment of Remote Visual Testing
System Capabilities for the Detection of
Service Induced Cracking

Figure 1-3

 

(a)

(b)

Figure 1 - The effects of pixiliation: (a) a line; (b) resulting lower contrast image.

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(a)
(b)

Figure 2 - Reduction of visual acuity during scanning: (a) a screen capture from a videotape with a stationary camera, showing sharper features; (b) a screen capture of a nearby area with the camera in motion, showing a blurred image and indistinct surface features.  

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Figure 3 - An example of a current performance demonstration standard showing two 12 mm (5 x 10-4 in.) crossed wires against an 18% neutral gray card.  

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Copyright © 2005 by the American Society for Nondestructive Testing, Inc. All rights reserved.

 

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