Page 289 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

278 CHAPTER 10 Video
• Make all movements slow, controlled, and deliberate, understanding that the submersible is both an eye and a camera platform.
• Attempt to be consistent with the filming style. When panning, try to always pan from left to right (or right to left). When approaching an item for inspection, attempt to look all around the item for status and structure before going in for close-ups.
• Since the specialty of an ROV system is its on-station loiter capabilities, take the time to fully document the subject before moving on to another location. Do as many “takes” as necessary to get the required shot.
• Go into a subject area with an eye for the final edit and get the footage needed for that edit in mind.
• An audio overlay will assure the video is annotated and allow for the tape to be a stand-alone document. Make sure to have an on/off switch, because an open mike can make for embarrassing playback.
10.8 Documentation and disposition
The end product of any underwater operation is the documentation of the project and the final dis- position of the object of interest. Some ROV systems allow digital capture of images directly onto magnetic media; others simply allow screen capture of a frame of video to use in formal documentation.
Any final report to the customer should include a condensed version of all the notes taken dur- ing the operation, in a readable format, along with an edited video presentation of the operation.
There are many excellent inexpensive digital video-editing programs available. These enable coarse editing while in the field to allow for a deliverable report immediately at the end of the job.
Also available in postprocessing is a much more detailed condensation organize a formal, professional presentation to the customer, design a that is easily adaptable to different operations and open customer base.
of the operation. In order to template for the final report
the work to be in a journal- of documentation. The final project in a clear, concise, showcasing the professional
The physics of underwater lighting/optics will affect the image properties produced by ROV equip- ment used in any underwater mission. Most people’s experience (and frame of reference) with optics centers on light in air; therefore, this section will address the changes that occur when light enters water.
Light refraction and dispersion occurs when a light beam is passed through water (Figure 10.32). When viewing an object in water through a plane window, unless the lens is corrected, refraction causes focus error, FOV error, and distortion as follows.
The format of “Who, What, When, Where, Why, and How” allows
istic format, with complete reporting of the event at an adequate level
report is all about transmitting the information from the underwater accurate, and readable format. The final report becomes a calling card, capabilities of the team and possibly a ticket to the next interesting assignment.
10.9 Underwater optics and visibility