【摘要】：在現(xiàn)有的嵌入式圖形系統(tǒng)中,圖形顯示占據著越來越重要的地位。特別是在一些特殊的嵌入式圖形系統(tǒng)中,如飛機座艙顯示畫面,飛機在飛行中的姿態(tài)比較復雜,為了能夠實時反映飛機姿態(tài),所以要求飛機座艙內的圖形顯示器的圖形畫面能夠動態(tài)、實時、平滑和清晰的進行顯示。顯示畫面的質量與字符發(fā)生器的硬件結構和圖形生成算法有關。由于機載液晶顯示器在顯示旋轉的字符、刻度線時會因為光柵顯示器的分辨率限制從而存在圖形的鋸齒狀的走樣現(xiàn)象,嚴重的走樣現(xiàn)象將影響飛行員對飛機姿態(tài)的判斷,從而造成飛行隱患甚至飛行事故。根據國內外座艙顯示技術、OpenGL技術的發(fā)展及圖形反走樣算法的現(xiàn)狀,本文選擇VxWorks嵌入式操作系統(tǒng)作為硬件的操作系統(tǒng),應用圖形反走樣算法設計出滿足座艙顯示系統(tǒng)的圖形畫面。本文所取得成果包括以下幾個方面： 通過對多種反走樣方法進行研究和比較,在原有的Bresenham直線生成算法上進行改進,采用多像素繪制直線,有效的避免了原有Bresenham直線生成算法的出現(xiàn)的鋸齒現(xiàn)象。在基于VC++平臺上編制使用反走樣算法圖形繪制程序,對反走樣算法使用前后程序生成的圖形進行比較,使用反走樣算法生成的圖形基本解決了原有圖形繪制過程中明顯的圖形走樣問題,圖形中的鋸齒現(xiàn)象明顯減弱,同時驗證了改進的Bresenham直線反走樣算法和字符反走樣算法的可行性和有效性。 為了驗證改進的Bresenham直線反走樣算法和字符反走樣算法在硬件系統(tǒng)的可移植性,本文選擇通用的MPC8245評估板作為字符圖形發(fā)生器的硬件系統(tǒng),結合嵌入式操作系統(tǒng)VxWorks完成了反走樣算法在PowerPC硬件平臺上的仿真測試和算法移植,使用OpenGL標準圖形庫繪制圖形,圖形顯示效果良好。
[Abstract]:Graphic display plays a more and more important role in the embedded graphics system. Especially in some special embedded graphics systems, such as aircraft cockpit display screen, the attitude of aircraft in flight is more complex, in order to reflect the attitude of aircraft in real time, Therefore, the graphics display in aircraft cockpit can be dynamic, real-time, smooth and clear display. The quality of the display screen is related to the hardware structure of the character generator and the graphics generation algorithm. Because airborne LCD displays rotated characters and the scale line is limited by the resolution of the grating display, there is a zigzag aliasing phenomenon of the graphics. The serious aliasing phenomenon will affect the pilots' judgment of the aircraft attitude. Thus causes the flight hidden danger and even the flight accident. According to the development of cockpit display technology and the current situation of graphic anti-aliasing algorithm at home and abroad, this paper chooses VxWorks embedded operating system as the hardware operating system, and designs a graphic picture to satisfy the cockpit display system by using the graphic anti-aliasing algorithm. The results obtained in this paper include the following aspects: through the research and comparison of various anti-aliasing methods, the original Bresenham line generation algorithm is improved, and the lines are drawn with multi-pixels. It effectively avoids the sawtooth phenomenon of the original Bresenham line generation algorithm. Based on VC platform, the graphics drawing program using anti-aliasing algorithm is compiled, and the graphics generated by the anti-aliasing algorithm before and after the use of the anti-aliasing algorithm are compared. The figure generated by the anti-aliasing algorithm basically solves the obvious problem of figure aliasing in the original drawing process, and the sawtooth phenomenon in the graph is obviously weakened. At the same time, the feasibility and effectiveness of the improved Bresenham line aliasing algorithm and character antialiasing algorithm are verified. In order to verify the portability of the improved Bresenham linear anti-aliasing algorithm and the character anti-aliasing algorithm in the hardware system, this paper chooses the universal MPC8245 evaluation board as the hardware system of the character graph generator. The simulation test and algorithm transplantation of anti-aliasing algorithm on PowerPC hardware platform are completed with the embedded operating system VxWorks. The graphics are drawn by using OpenGL standard graphics library, and the graphic display effect is good.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TP391.41;TP368.1

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