排序方式: 共有11条查询结果,搜索用时 810 毫秒
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本文系统分析了SOL语句的执行过程。针对不同类型的应用系统对其SQL语句的优化目标进行了分析、阐述,并从三个不同的角度对SOL语句的优化方法进行了探讨。 相似文献
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In three-dimensional displays,large vertical parallax in parallax images is disadvantageous to stereo vision due to the presence of visual fatigue.Based on the principle that homologous points in different parallax images correspond to the same object point,a method is proposed to eliminate the vertical parallax in multi-view parallax images.The coordinate mapping relationship between a standard parallax image and an awaiting rectification parallax image is established according to the coordinates of the image points of the rectangular calibration board vertices.Experiments are conducted,and results prove that the proposed method is reliable. 相似文献
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We propose an autostereoscopic three-dimensional (3D) projection display. The display consists of four projectors, a projection screen, and two lenticular sheets. The operation principle and calculation equations are described in detail and the parallax images are corrected by means of homography. A 50-inch autostereoscopic 3D projection display prototype is developed. The normalized luminance distributions of viewing zones from the simulation and the measurement are given. Results agree well with the designed values. The proposed prototype presents full-resolution 3D images similar to the conventional prototype based on two parallax barriers. Moreover, the proposed prototype shows considerably higher brightness and efficiency of light utilization. 相似文献
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光栅式自由立体显示器概述 总被引:5,自引:0,他引:5
文章介绍了光栅式自由立体显示器的结构及原理,分析了影响其立体效果及性能的因素,如人眼调节和会聚特性、多视点技术、亮度及分辨率损失、串扰、2D/3D切换及兼容性等,并简要介绍了相应的提高立体显示效果的方法。 相似文献
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基于方形RGBW子像素排列的跟踪式自由立体显示屏 总被引:1,自引:1,他引:0
针对传统基于移动狭缝光栅的跟踪式自由立体显示中因观看者头部微动看到串扰立体图像的问题,提出了一种基于方形RGBW子像素排列和斜置狭缝光栅的跟踪式自由立体显示屏,通过创建具有固定宽度的无串扰视区,为不同观看者提供无串扰的立体图像。分析了自由立体显示屏的工作原理,给出了其参数计算公式。实际设计了基于提出方法和传统方法的跟踪式自由立体显示屏,并仿真了它们在最佳观看距离处水平方向上的亮度分布。通过对比分析,得出基于提出方法的跟踪式自由立体显示屏在最佳观看距离处获得了具有固定宽度的无串扰视区,从而保证了观看者始终观看到无串扰的立体图像。 相似文献