CAJ | 학술논문

作为近界视景导航中典型地物，三维几何树模型能提高虚拟场景视觉精度，增强场景真实感，但会导致大规模森林场景绘制效率降低，从而降低视景导航精度。为提高绘制效率以确保视景导航精度，并提高场景真实感，采用布告板云算法构建了基于视距的多分辨率树模型，针对算法在近界视景导航应用中存在的问题进行了改进。为进一步提高近界特别是贴地飞行时高动态视点下视景导航精度，根据有限视域、威胁区域以及视觉冗余等特点，提出了一种基于高动态视点的加速绘制算法。通过实验对比分析，算法大幅提高了场景绘制效率，增强了场景视觉质量，提高了虚拟场景导航精度。
작위근계시경도항중전형지물，삼유궤하수모형능제고허의장경시각정도，증강장경진실감，단회도치대규모삼림장경회제효솔강저，종이강저시경도항정도。위제고회제효솔이학보시경도항정도，병제고장경진실감，채용포고판운산법구건료기우시거적다분변솔수모형，침대산법재근계시경도항응용중존재적문제진행료개진。위진일보제고근계특별시첩지비행시고동태시점하시경도항정도，근거유한시역、위협구역이급시각용여등특점，제출료일충기우고동태시점적가속회제산법。통과실험대비분석，산법대폭제고료장경회제효솔，증강료장경시각질량，제고료허의장경도항정도。
As the typical ground objects in near-ground visual navigation application,the three-dimensional geometrical models of trees can improve the visual precision and the reality of virtual scene.However,it may lead to the decrease in rendering efficiency of a wide forest scene and result in the loss of navigation precision.In order to boost the rendering efficiency to ensure the navigation precision and maintain the sense of reality,billboard clouds algorithm was employed to establish the multi-resolution tree models based on view distance and its disadvantages existing in near-ground visual navigation application were improved.To improve the visual navigation precision with high dynamic viewpoint in the near-ground especially the nap-of-the-earth flight further,an accelerating rendering algorithm based on high dynamic viewpoint was proposed in accordance with the characteristics of limited horizon,threatened area and redundant vision.The contrast analysis of experiments testifies that the proposed algorithm improves the rendering efficiency,enhances the vision quality of the scene and raises the navigation precision of virtual scene.