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Simulation Study and Analysis on Errors of Ice Thickness Estimations Using Ship-board Digital Camera Based on Laboratory Tests

Author: LiuPu
Tutor: LiZhiJun
School: Dalian University of Technology
Course: Port, Coastal and Offshore Engineering
Keywords: CCD Ice thickness Simulation Study Error Analysis
CLC: U661.7
Type: Master's thesis
Year: 2010
Downloads: 22
Quote: 0
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Abstract


With the development of digital technology , the use of digital cameras to capture cross-section technology has been applied widely in the polar sea ice surveys and offshore sea ice monitoring of broken ice . Using image processing technology , can be extracted from these ice - sectional images of the sea ice thickness . But research vessel offshore platform or a moving vessel , sent to the ice surface field measurements the broken ice sectional thickness can not be achieved CCD observations of sea ice thickness data to be compared with the true value of sea-ice thickness analysis is not possible . The main work of this paper is the by laboratory physics simulation study on the side of the ship CCD sea ice thickness observation techniques , detailed the results of the error analysis , observations and single CCD camera technology with dual CCD stereo camera technology . . First, a detailed analysis the broken ice cross-section of the flip and CCD shooting distance of the observation error . The flip icebreaker cross-section of the side of the sea ice movement described as a rigid body motion in the space rectangular the coordinate system OXYZ within ice cross section around the X , Y, and Z three-axis rotation angle defined as the angle α , β , and γ . CCD shooting distance parameters can not be used as a unified , therefore be translated into the image scale . Using linear regression and curve fitting analysis of the three angles of α, β, γ and image proportion H observation error . Secondly, the differences of human error is analyzed. Select ice cross section in a horizontal and parallel to the ship's side (α = β = γ = 0 °) of the same image , thus eliminating the ice sectional flip error . Sectional model image of the ice in the laboratory using the same image to analyze human error differences . Single CCD camera with dual CCD stereo camera observation data analysis : When ice cubes sectional flip angle is zero (α = β = γ = 0 °) , the maximum error in the optimal observing the effect of the single - CCD camera observations value is less than the maximum error value of the dual CCD stereo camera observations . But this is a very exceptional circumstances , in most cases , does not exist in this situation , the authors recommend : In view of the the dual CCD stereo camera observation data error is smaller , is also introduced into the polar sea ice expedition in a meaningful research direction .

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship performance test equipment
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