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題名 | 一種快速平面圖形旋轉法= |
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作者 | 郭穎鋒; |
期刊 | 中華工專學報 |
出版日期 | 19910100 |
卷期 | 6 1991.01[民80.01] |
頁次 | 頁253-293 |
分類號 | 448.945 |
語文 | chi |
關鍵詞 | 平面; 旋轉法; 圖形; |
中文摘要 | 目前,在電腦繪圖研究領域中,處理非線框式影像的轉換運算,如旋轉、鏡射… …等,執行速度仍是十分緩慢,其中較具效率的方法,便是引用Bresenham增量式法則。 首先,本文研究的重點便是在努力延伸增量式的精神,企圖以二維陣列貫連(2D Coherence)的觀念,來加速各種非線框的轉換運算。 其次,本文乃針對掃描式顯示器(Raster Scan Display)的特徵加以配合: (1)若能將旋轉後的連續水平點組合成串列,則可由一個機器指令,一次送兩個拜 (Bytes)的點(Pixels)到輸出的頁框緩衝器上。 (2)傳統的方法在轉換運算上,無法完全避免“洞“的產生,如若改以平頭式的增量法則 ,便再無補洞的煩惱。 |
英文摘要 | The excution speed of many operations such as rotation, mirror, etc,... ., when applied to non-wired frame (image, or bit map) objects are still slow. To improve, Bresenhams's Incremental Criteria (BIC) is one helpful principal. This thesis is to extend the BIC concept are to apply the two dimensional coherence relations to reach the following goals which can greatly speed up the rotation operation: (1) Combining enough contigous horizontal rotated points (bits, dots, orpixels) such as 16 bits or 32 bits (one word or onetwo double word in PC), which can be plotted by using just onesingle machine instruction. (2) The conventional unavoidable "hole" effect. Produced by other methods can be completely avoided. Actually speaking, it is not avoided, it just never occured in our method. |
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