摘要
近年來影像紀錄已經成為保留證據與敘述事件的重要方法，此研究利用光軌跡追蹤模擬全景影像，設計適合安裝於自動體外除顫器上的全景鏡頭，以便能夠清楚拍攝到半徑三公尺距離內的人物影像。 此研究中的全景鏡頭是透過曲面鏡的反射來取得包含四周景物的全景影像，再利用環場轉換程式將原始影像展開還原成方便觀察的環場影像。為了節省設計與製做全景鏡頭的時間與費用，此研究利用立體光軌跡追蹤的影像軟體來模擬全景攝影所需要的鏡頭與周圍的景物。從電腦模擬結果可以快速得知曲面鏡規格改變時，對於所拍攝影像的影響。 為了強化全景鏡頭結構的堅固性，全景鏡頭設計成為實心的圓弧形，外曲面的頂部為一個平面反射鏡，內曲面則為一個曲面反射鏡，攝影機放置於曲面鏡頂點中央小孔的下方並透過小孔進行拍攝。由於拍攝目標主要為一兩公尺內的近距離物體時，影像會有較嚴重的形變問題，需藉由不同距離的校正曲線在轉換成環場影像時進行形變的修正。
並列摘要
Over the last few years, video recording has become an important method of preserving evidence or describing things. Raytracing technique was used in this study to design a panoramic lens suitable for mounting on an automatic external defibrillator. The lens should capture the image of people and things within 3 meters during the rescue occurrence. A reflective type of panoramic lens was chosen because of its low profile. The lens is made up of a flat mirror above a convex mirror that reflects the surrounding scene. A computer program was developed to convert the 360 degree circular view to a panoramic strip view. By using 3D ray tracing simulation, the structure dimensions of lens can be easily modified in simulation to study their effect on panoramic image. This speeds up the process of panoramic lens design and saves the cost. In order to strengthen the structure of lens, it is designed as a solid ellipsoidal dome with a clear convex ellipsoidal front surface and a concave ellipsoidal rear surface mirror. The cap of the front surface is cut off as a flat mirror, and a clear small aperture is made at the cap of the rear surface mirror. The camera sits right underneath the concave mirror and shoot through the aperture. Since most of the targets are at a distance of one to two meters, the images are seriously distorted. Calibration curves for different distances are needed to correct the distortion while converting to a panoramic strip image.
參考文獻
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