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題名 | 以新型二維編碼技術應用於三維立體的量測=Measurement of 3D Profile by a New Two Dimension Coding Technique |
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作者姓名(中文) | 謝振榆; 徐力弘; | 書刊名 | 技術學刊 |
卷期 | 14:1 1999.03[民88.03] |
頁次 | 頁85-91 |
分類號 | 312.1 |
關鍵詞 | 疊紋; 景深; 光柵; Moire; Depth; Structure light; |
語文 | 中文(Chinese) |
中文摘要 | 三度空間的非接觸性外形量測,在實際的應用方法上,對於影像的抓取可以用一 個相機、兩個相機、多個相機來抓取影像,亦或是以連續式影像來處理,但數學運算量都很 大,計算費時。而在許多方法上的假設條件太多,從而使應用時有特定性與局限性,如何減 少假設條件及應用於一般的情況是本文的重點。本文以結構光源投影法(Structure Light)進行 三度空間物體的外形量測,利用簡單及低成本的實驗架構,以商用投影機及CCD像機在PC 系統的架構下發展出一套量測系統。在系統中以光柵投影在三度空間的物體上,再利用一個 新的編碼方法找出唯一對應點,並可同時提高解析度。本文以反透視投影法來估算物體外形 並解決非格點之問題(subpixel problem),求出空間座標及影像座標,再轉換得出物體外形或 深度(Depth)的訊息。 |
英文摘要 | Many noncontact methods for 3-D measurement can be used in practical situations. Images can be captured by a single camera, stereo cameras, many cameras, or image sequences. However computation time increases with the number of images used. The measurement system is limited to off-line, not real time, and too many assumptions are required for the computations. Therefore the applications are restricted for some particular cases. This paper examines a 3-D measurement system based on the coding principle under a structured light pattern. A simple measurement setup consisting of a commercial slide projector and a CCD camera was used. A PC- based system was used for easy development and evaluation. This paper also presents a new coding technique to solve the unique correspondence problem. By using back perspective projection to estimate the neighboring depth information, the subpixel problem is also solved. |
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