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      • KCI등재

        Lane Detection Based on Inverse Perspective Transformation and Kalman Filter

        ( Yingping Huang ),( Yangwei Li ),( Xing Hu Wenyan Ci ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.2

        This paper proposes a novel algorithm for lane detection based on inverse perspective transformation and Kalman filter. A simple inverse perspective transformation method is presented to remove perspective effects and generate a top-view image. This method does not need to obtain the internal and external parameters of the camera. The Gaussian kernel function is used to convolute the image to highlight the lane lines, and then an iterative threshold method is used to segment the image. A searching method is applied in the top-view image obtained from the inverse perspective transformation to determine the lane points and their positions. Combining with feature voting mechanism, the detected lane points are fitted as a straight line. Kalman filter is then applied to optimize and track the lane lines and improve the detection robustness. The experimental results show that the proposed method works well in various road conditions and meet the real-time requirements.

      • KCI등재

        In-Situ Precipitated Needle Like Nanocrystalline β-Ti Reinforced Porous Titanium Alloy via Molten Salt Electrolysis

        Hao Wang,Jiahao Zhao,Honglin Li,Zhifeng Huang,Yangwei Wang,Qiang Shen,Fei Chen 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1

        Fabricating porous active metals through chemical dealloying poses challenges due to their reactivity and vulnerability tooxidation in aqueous solutions. The objective of this study was to create micron-sized porous Ti alloy by utilizing the Ti–Mo system as a precursor alloy for chemical dealloying. The impact of phase composition and initial microstructure of theprecursor alloys (Tix at% Mo100 − x at%, x = 60 ~ 70) on the morphology of the resulting porous Ti alloy was systematicallyinvestigated. To improve the mechanical strength and minimize oxidized phases during the dealloying process, a molten saltelectrolysis (MSE) method was employed. The strengthening mechanism of MSE on porous Ti alloys encompassed three keyaspects. Firstly, it effectively reduced the presence of oxidized phases, thereby eliminating surface defects. Secondly, MSEfacilitated grain growth and eliminated voids and cracks at the grain boundaries, leading to enhanced mechanical properties. Thirdly, the involvement of a secondary phase contributed to the overall strengthening mechanism. Following MSE treatment,the oxygen content in the porous Ti alloy decreased from over 13 to 5 at%, and needle-like nanocrystalline β-Ti precipitatesformed within the ligament structure. The accumulation and aggregation of compression-induced dislocations at the grainboundaries of the precipitated phase further improved the mechanical properties. In summary, this work presents an innovativeapproach to fabricating porous Ti alloy with low oxygen content, high strength, and adjustable microstructure. It elucidatesthe strength enhancement mechanism by MSE, providing insights for future materials development and applications.

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