Non-contact vision measurement device and method for geometric dimension of ship
A technology of geometric dimension and visual measurement, applied in measurement devices, optical devices, instruments, etc., can solve the problems of poor accuracy, inaccurate calculation and comparison, large data errors, etc., to achieve simple measurement process, accurate measurement results, The effect of automation
Inactive Publication Date: 2010-09-01
HOHAI UNIV CHANGZHOU
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Problems solved by technology
[0002] At present, the efficiency of domestic ships passing through locks is generally low, and the key to ship tonnage measurement is the measurement of ship geometric dimensions
Since the measurement of ship specifications relies on statistical methods of manual observation and rough estimation, the efficiency is low, the data errors are large and there are omissions, and the measurement process is cumbersome and inaccurate; Double charges, calculation and comparison are not accurate
The collection of various ship fees is based on the tonnage of the ship provided on the ship’s certificate. Fake cards for large ships and small ship numbers often occur. It takes manpower to check the card and ship, and the accuracy is poor. It cannot truly reflect the actual tonnage carried by the ship, and cannot realize the automation of fee collection
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[0022] Such as figure 1 As shown, the present invention is made up of hull 7, camera 1, camera 2, camera 3, camera 4, on-site measurement host 5 and on-site target 6. Two cameras 1, 2 are placed on the hull 7, and two cameras 3, 4 are placed on the side. These 4 cameras are connected to the field host 5 through coaxial analog video cables respectively. The 4 cameras are selected from Denmark, model: CV-M4+, 2 / 3”CCD, resolution 1380X1030, electronic shutter 1 / 24-1 / 1000 SEC , 12V DC power supply. Camera 1 and camera 2 are combined to form a binocular vision imaging mode, and the distance between them can be adjusted within the range of 20-5000cm according to the actual situation on site. The camera 3 and the camera 4 are combined to form a binocular vision imaging mode, and the field of view of the two cameras must have an overlapping area, and the distance between the two cameras can be adjusted within the range of 20-5000cm according to the actual situation on site. An on-s...
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The invention discloses a non-contact vision measurement device and a non-contact vision measurement method for geometric dimension of a ship. The method comprises the following steps of: placing two video cameras on a ship body, placing two video cameras on the lateral surface of the ship body, and connecting the four video cameras and a field host through coaxial analog video cables respectively, wherein the distance between the video cameras is adjustable in a range of 20 to 5,000 centimeters; mounting a field target among the four video cameras; calibrating the video cameras by using the video cameras as basic measurement units and adopting the field target respectively; acquiring and solving image data of the length and width of the ship body and the height of the above-water part by adopting the video cameras, performing three-dimensional reconstruction by using an area-based three-dimensional matching algorithm and using characteristic points and corresponding world coordinates, and solving the distance between two points so as to obtain the length and the width of the ship body and the height of the above-water part of the ship body. The device and the method can prevent the ship from overloading and blocking, have simple measurement process and precise measurement result, save manpower, and realize automation of ship measurement and automation of internal river passing ship toll administration.
Description
technical field [0001] The invention relates to a non-contact visual measuring device and method for geometric dimensions of ships, belonging to the technical fields of ships, computer vision and pattern recognition. Background technique [0002] At present, the efficiency of domestic ships passing through locks is generally low, and the key to ship tonnage measurement is the measurement of ship geometric dimensions. Since the measurement of ship specifications relies on statistical methods of manual observation and rough estimation, the efficiency is low, the data errors are large and there are omissions, and the measurement process is cumbersome and inaccurate; Double charges, calculations and comparisons are also imprecise. The collection of various ship fees is based on the tonnage of the ship provided on the ship’s certificate. Fake cards for large ships and small ship numbers often occur. It takes manpower to check the card and ship, and the accuracy is poor. It cann...
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IPC IPC(8): G01B11/00G01B11/03
Inventor 范新南徐立中张学武
Owner HOHAI UNIV CHANGZHOU