Page 260 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition
P. 260
Video
CHAPTER CONTENTS
10
10.1 History ....................................................................................................................................... 250
10.2 How it works ..............................................................................................................................251 10.2.1 The camera.......................................................................................................... 251 10.2.2 Lensoptics..........................................................................................................254 10.2.3 The signal............................................................................................................ 259 10.2.4 Thedisplay..........................................................................................................264 10.2.5 Composite(baseband)video..................................................................................267 10.2.6 The transmission (RF modulation).......................................................................... 269
10.3 Digitalvideo...............................................................................................................................269
10.4 Videocapture.............................................................................................................................272
10.5 Video compression......................................................................................................................273
10.6 Video over Internet protocol ........................................................................................................275
10.7 Video documentation...................................................................................................................276
10.8 Documentation and disposition ....................................................................................................278
10.9 Underwater optics and visibility...................................................................................................278 10.9.1 Focus error .......................................................................................................... 279 10.9.2 FOVerrors............................................................................................................279 10.9.3 Distortion.............................................................................................................279 10.9.4 Absorption...........................................................................................................280 10.9.5 ROV visual lighting and scattering.......................................................................... 281
As video is generally considered the main sensor of the ROV, this chapter will delve fairly deeply into the theory and mechanics of video generation and troubleshooting. This section is targeted for a general overview of the various aspects of camera and video technology so as to understand the specifications of the camera used on subsea vehicles. For further explanations of the various tech- nologies involved, please refer to the references at the end of this manual.
The ROV Manual.
© 2014 Robert D Christ and Robert L Wernli. Published by Elsevier Ltd. All rights reserved.
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