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Images Effects

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by

Berenice Gonzalez

on 5 December 2013

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Transcript of Images Effects

Visibility
Critical Issues
Calibration
Resolution
Illumination (Regulation of light)
Effects to be consider for using water cameras to carry out inspection or intervention activities on subsea equipment
Inspection and Intervention
Inspection is a procedure to identify
Actual or possible failure due to fracture
Separation of the material
Deformation
Change of shape and/or position in the subsea facilities.
Perception
Colour (camera used for inspection)
High inspection quality images at typical inspection ranges 0,2-2 m
Good quality lighting
Zoom and focus capability
Sensitivity (1 lux-0,1 lux)
Horizontal resolution (> 400 lines)


Reduction of Contrast
Water Turbidity
Illumination
Depth
Camera (visual effects)
Presence of Sediment
Sun Position
Surface Shape
Contaminants
Reduction of Contrast / Brilliance
Water Turbidity
Turbid water
Objects in a distance of 3-4 ft could be perceived far away
Clear water
Objects at 50 or 70 ft could be perceive closer
NORSOK STANDARD
Remotely Operated Vehicle Services
Low light navigation camera
High quality images
Wide angle view over long distances
Minimum light sensitivity (3 x10-2 lux at face plate and 3 x 10-1 lux at scene)
Horizontal resolution ( > 400 lines)
Depth of focus (150 mm to infinity)
HD camera
Inspection ranges 0,2-2 m
Good quality lighting to reproduce HD quality
Zoom and focus capability
Sensitivity (faceplate 0,1 lux)
Horizontal resolution (1080i or 720p)
Lights shall be distributed on minimum two independent circuits, have variable intensity and shall preferably have possibility for both spot and flood lighting.
Requirements for ROV’s cameras:
Refraction
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
(NORSOK U-102, 2012, page 15)
1. http://integra-indepthinspection.com/repository/acfm1269237490_800_600.jpg
2. http://www.nbcnews.com/id/37913126/#.Up_K1Fvxplw
3. http://www.seafriends.org.nz/phgraph/water.htm
4. http://hibbardinshore.com/case-studies/internal-external-joint-support-inspection.html
5. http://www.seafriends.org.nz/enviro/plankton/balance.htm
6. http://www.vitruvian-consultants.com/subsea.aspx
7. http://www.lyyn.com/showroom/industries/subsea/commercial-diving/
8. http://www.bing.com/images/search?q=subsea+gas+leak&FORM=HDRSC2&id=D282B88ED43E8566A7F0172C8D455578ADB09A3F&selectedIndex=4#view=detail&id=D282B88ED43E8566A7F0172C8D455578ADB09A3F&selectedIndex=0
9.http://www.offshoreenergytoday.com/china-zhuhai-msa-reports-gas-leak-from-subsea-pipeline-cnooc-shuts-production/
10. 6. http://www.scielo.br/scielo.php?pid=S0004-27492003000600009&script=sci_arttext

References
Figures

11. SS521-AG-PRO-010, 0910-LP-103-8009, U.S. Navy Diving Manual—Volume 1, CHAPTER 2, (Agust 2005), Underwater Physics, 36 pages.
12. NORSOK STANDARD U-102, (September 2012), Remotely operated vehicle (ROV) services Edition 2, NORWAY, 52 pages.

Standards & Manual
Full transcript