Abstract
Cabin hatch cover plays an important role for a typical aircraft to ensure the aircraft quality and flight safety. In the test flight inspection and routine maintenance of an aircraft, one crucial step is to open cabin hatch covers one by one for detailed inspection. Authorized operators suffer from difficulties to recognize different covers with similar shapes and different inspection requirements. In this paper, an edge-based cover recognition and tracking method is proposed to recognize different hatch covers with similar shapes. First, a fast edge feature is proposed to describe image contours with simple geometric constraints. Second, based on the edge feature, a novel cover descriptor, consisting of shape and position description vectors, is presented to recognize those different covers with similar shapes. Third, on the basis of recognized cover landmarks, a direct visual odometry–based camera tracking method is presented to improve the robustness of cover recognition. The experiments are implemented in a piece of simplified mockup of aircraft cabin skin, and the results show that the proposed method has good practicability and real-time property. Meanwhile, the tracking accuracy is also good enough in the augmented reality inspection environment.
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