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技術學刊 EIScopus

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篇名 內螺紋自動檢測機台之設計研發
卷期 25:3
並列篇名 Design and Develop an Internal Thread Defect Auto-Inspection System
作者 彭德保陳思翰張元碩李恕明張朝香王文政
頁次 235-243
關鍵字 傅立葉轉換影像還原技術內螺紋條狀性紋理自動光學檢測工業內視鏡internal threadmachine visionrigid industrial endoscopedirectional textureFourier-based image restoration schemeEIScopusTSCI
出刊日期 201009

中文摘要

由於內螺紋 (internal thread) 特殊的結構與空間位置的限制,目前尚未發現以機器視覺為基礎的內螺紋檢測機制。本研究所發展之光學螺紋塞規(optical thread plug gauge, OTPG),可對內螺紋工件進行非接觸式的自動化檢測。OTPG乃以內視鏡及電荷耦合元件 (charge coupled device, CCD) 組成取像光學模組,並透過觸發器與兩組馬達控制單元搭配,逐步拼貼連續拍攝到的部分螺紋影像,以重建出360度內螺紋壁的二維全周影像圖 (unwrapped image),接著,運用傅立葉轉換法 (Fourier transform, FT) 將影像還原,並配合統計管制圖之二值化法來突顯依附在內螺紋上的瑕疵,如:螺紋坡 (flank) 上凸起狀
的刮痕 (scratch),以及螺峰 (crest) 或螺谷 (root) 上凹陷狀的崩塌 (collapse)
或裂痕 (flaw)。

英文摘要

This paper has proposed and developed a novel optical thread plug gauge (OTPG) for internal thread inspection using machine vision.The OTPG is composed of a rigid industrial endoscope, a charge-coupled device
camera, and a two degree-of-freedom motion control unit.A sequence of
partial wall images of an internal thread are retrieved and reconstructed
into a two-dimensional unwrapped image.Then, a digital image processing and classification procedure is used to normalize, segment, and determine the quality of the internal thread. The proposed OTPG provides an orientation-free and convenient method for detecting defects such as scratches, collapses, and flaws in an internal thread.

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