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Real time binocular vision guidance method facing to underwater carrying vehicle

An underwater vehicle, binocular vision technology, applied in instruments, line-of-sight measurement, mapping and navigation, etc., can solve problems such as increased matching error and inaccurate ranging.

Inactive Publication Date: 2008-08-27
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there is a local low-texture area, the matching error in this area increases, resulting in inaccurate ranging

Method used

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  • Real time binocular vision guidance method facing to underwater carrying vehicle
  • Real time binocular vision guidance method facing to underwater carrying vehicle
  • Real time binocular vision guidance method facing to underwater carrying vehicle

Examples

Experimental program
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example 1

[0081]Experiments were performed using the widely used Tsukuba synthetic stereo image pairs. The Tsukuba stereo image pair has been rectified and has a size of 384×288. Its real disparity map is shown in Figure 6(b). In the experiment, the pyramid series k=4, the zoom ratio is r=2, the matching window is 15×15, the NCC threshold is 0.5, the parallax range is (0, 40), and the texture threshold is 0.1. On the Pentium 42.40GHz industrial computer, the stereo matching is calculated The parallax process took an average of 164.5ms. The NCC value can be used to measure the matching accuracy. The obtained disparity map and NCC map are shown in Fig. 7 .

example 2

[0083] Experiments are carried out in a simulated autonomous underwater vehicle (AUV for short) motion environment. The resolution of the two industrial digital CCD cameras is 1280×1024. On the basis of accurate calibration, the captured image pair is corrected first, and then the above method is used to set the pyramid level k=4, the zoom ratio is r=2, the matching window is 21×21, the NCC threshold is 0.85, and the parallax range is (- 230, -200), Texture Threshold 15. The average time spent on obtaining the disparity map by running the program on the same industrial computer is only 258ms, and the accuracy of the obtained depth map can reach millimeter level. See Figure 8 for the corrected image pair, and Figure 9 for the disparity map and NCC map. It can be seen from Figure 9 that the pyramid NCC algorithm based on texture control effectively extracts the depth of obstacles from the simulated ocean environment. The calculation time of 258ms proves that this method has pr...

example 3

[0085] Using this binocular vision guidance system, a simulation test of AUV space obstacle avoidance was carried out in the laboratory. The experiment was carried out on a four-degree-of-freedom AUV simulated motion platform. The platform is driven by four high-precision stepping motors, which can well simulate the advance and retreat, lateral movement, heave and head turn of the AUV in the marine environment. The entire obstacle avoidance simulation system is composed of three parts: binocular guidance system, obstacle avoidance control system and executive mechanism - AUV simulation motion platform and peripheral equipment.

[0086] As shown in Figure 10, the binocular camera is fixed on the front end of the AUV motion model, and a spherical obstacle and a square obstacle with a straight surface are placed on its walking path. The spherical obstacle is located to the left of the AUV's initial position, and the square obstacle is located to the right of the AUV. When the s...

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Abstract

The invention provides a real-time binocular vision guidance method for an underwater vehicle. Aimed at the characteristics of the marine environment where the underwater vehicle operates, the invention puts forward a pyramid normalized covariance binocular vision algorithm based on the texture control to realize the real-time property of the application level with the precision stabled at the centimeter level. Regarding the final demonstration of an environmental message, the real-time binocular vision guidance method puts forward a virtual sonar model, thereby expressing the 2.5-dimensinal message as a barrier (or target) matrix based on the virtual sonar model. And the matrix contains the depth and bearing information of the barrier (or target).

Description

(1) Technical field [0001] The invention relates to a method capable of providing azimuth and distance information of targets or obstacles for underwater vehicles in real time. (2) Background technology [0002] With the development of various underwater vehicle technologies, sonar has become the most widely used sensing technology in underwater depth detection and obstacle detection. However, sonar has certain limitations in short-range applications, including low accuracy and blind spots. The superior performance of visual sensing technology at close range can just make up for this deficiency. It can provide high-resolution and high-precision (especially in short range) depth information for underwater vehicles. In recent years, the application of vision technology in tasks such as obstacle avoidance, target recognition, dock docking, cable maintenance, and submarine terrain modeling has become a research hotspot. In 1999, Negahdaripour and others at the University of M...

Claims

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Application Information

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IPC IPC(8): G01C3/00G01C11/00G06K9/64
Inventor 施小成王晓娟边信黔唐照东刘和祥
Owner HARBIN ENG UNIV
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