未來研究

為了讓本研究能更適用於實際應用上，可針對以下方向做改進：

投影片切換偵測的部分：

(1) 改善 DTW 無法區分兩張版面結構相似的影像，而少抓到換頁的地方。

(2) 目前僅使用 1fps 的方式偵測投影片切換，可針對處理需要增加(減少)，

以達正確率或速度的提升。

(3) 可考慮處理換頁時使用特效的情況，與攝影機大幅移動時的事件。

教學重點探勘的部分：

(1) 利用影像、音訊探勘所得結果推論與教學方式之間的關係。

(2) 可定義數種講者使用的手勢，以更準確的過濾非有意義手勢的部分。

44

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全華科技圖書股份有限公司

48

附錄ㄧ

影像中出現遮蔽物之偵測結果與方法比較之相似程度圖，橫軸皆為時間(單位為 秒)；縱軸為相似程度的分數(介於負 1 與正 1 之間)，綠點表示沒有發生投影片 換頁的情況，紅點表示有發生投影片換頁的情況。

only Kirsch Niblack + ER Correction

( II – a )

( II – b )

( II – c )

( II – d )

( II – e )

( II – f )

( II – g )

( II – h )

( II – i )

( II – j )