常温下LCD工作电压的优化设计

本文从扩大视角范围的角度，研究了工作电压的优比设计。     

半导体发光材料的新应用——视觉敏感GaAsP光敏二极管

本文讨论了半导体发光材料的新应用—ＧａＡｓＰ视觉敏感光敏二极管。这是在ｎ—ＧａＡｓＰ上制作浅结的光敏二极管，通过对研组份值、结深的控制，器件的｜△ＥＶ｜≤０．１，这意味着器件的光谱响应十分接近于人眼，其暗电流小于０．２ｐＡ／ｍｍ２，灵敏度为０．８μＡ／ｍｍ２。该光敏二极管已成功地应用于高级自动电子相机中。     

Size Effect of the Immediate Surround for the Border between the Natural and Unnatural Object Color Appearance

The border luminance of the test stimulus between the natural and unnatural object color, y_ynB_u was obtained for different spatial sizes of the immediate surround to prove that _nB_u can be determined based on a new recognized visual space of illumination (RVSI) that is assumed to be constructed for the immediate surround separately from the RVSI for the subjects room itself. The _nB_u of five test stimuli were determined for six different sizes covering from zero to 1866 cm² with four different lightnesses, N4, N6 and N8, while keeping the room illuminance constant at 100 or 600 lx. The results showed that luminance of the border _nB_u gradually decreased as the size of the immediate surround was increased and that the decrease was larger for immediate surround with lower lightness. The results were interpreted as showing a new RVSI constructed for the spatial extent of the immediate surround of the test stimulus, and the RVSI was more completely constructed for larger spatial size of the immediate surround. © 2005 The Optical Society of Japan     

摄像机标定技术在活塞视觉检测与分选中的应用研究

在机器人视觉检测及自动化分捡中,准确地校正摄像机镜头畸变对获取物体精确图像及确定物体准确位置具有重要意义。采用了带有径向畸变的小孔摄像机模型及基于线段斜率的标定方法。在标定过程中,应用线性算法求解出了镜头的径向畸变系数。实验表明,采用的标定方法简捷有效,其标定结果能够满足研究需要。     

基于FPGA的数字视频异步帧频转换器设计

利用DVI接口的同步控制信号生成内存写入地址,帧频触发信号控制内存读取地址的设计思想,在FPGA中实现了从任意帧频的数字视频源转换到50 Hz或60 Hz帧频.给出了帧频转换器的基本硬件结构,和实用的设计方法,并讨论了数据缓冲区设置深度与内存操作带宽的关系.     

小型电机的工程设计

在Windows平台上，利用C＋＋Builder可视化、反馈性和调试功能，可供专业工程技术人员学习和掌握简单易学的实践性和应用性强的工程设计，实现小型异步电机的数据分析和处理。形成了比较完善的工程设计软件。     

Extraction of Video Objects via Surface Optimization and Voronoi Order

We implement a video object segmentation system that integrates the novel concept of Voronoi Order with existing surface optimization techniques to support the MPEG-4 functionality of object-addressable video content in the form of video objects. The major enabling technology for the MPEG-4 standard are systems that compute video object segmentation, i.e., the extraction of video objects from a given video sequence. Our surface optimization formulation describes the video object segmentation problem in the form of an energy function that integrates many visual processing techniques. By optimizing this surface, we balance visual information against predictions of models with a priori information and extract video objects from a video sequence. Since the global optimization of such an energy function is still an open problem, we use Voronoi Order to decompose our formulation into a tractable optimization via dynamic programming within an iterative framework. In conclusion, we show the results of the system on the MPEG-4 test sequences, introduce a novel objective measure, and compare results against those that are hand-segmented by the MPEG-4 committee.     

Color appearance seen through a colored filter of various sizes

It will provide us an effective method to study the color perception of the elderly if we can employ for young subjects a pair of glasses with color property chosen to simulate that of the elderly. One problem has to be solved before using such glasses based on the concept of the recognized visual space of illumination, that is, the size of the glasses. When a piece of a white paper is seen through a yellow filter in a room, it naturally appears yellowish. But if the observer uses the filter to cover his/her eyes entirely the white paper returns to its original white; this is known as color constancy. Between these two extreme cases, the color is expected to change from yellow to white. Chromaticness and hue of an achromatic test chart of a small or large size were determined by the elementary color naming method when the chart was seen monocularly through a red, yellow, green or blue filter, respectively, placed at various distances from the eyes. Chromaticness was large at around 40% when the visual field through the filter was equal to or smaller than the test chart, but it rapidly decreased when the visual field extended over the test chart so that objects other than the test chart were included in the visual field. It decreased to almost zero when the filter was about 5 cm or less away from the eye. It was concluded that we do not necessarily have to use goggles to cover the entire visual field but can use a normal pair of glasses made of colored filters for young subjects to study the color perception of the elderly with understanding that the study is only for the color perception experienced while wearing the glasses.     

Superiority of zoom lens coupling in designing a novel X-ray image detector

We design a novel X-ray image detector by lens coupling a Gd2O2S:Tb intensifying screen with a high performance low-light-level (L3,which often means luminescence less than 10-3 Lux) image intensifier.Different coupling effects on imaging performance between zoom lens and fix-focus lens are analyzed theoretically.In experiment,for designing a detector of 15-inch visual field,the system coupled by zoom lens is of 12.25-1p/cm resolution,while the one with fix-focus lens is 10 lp/cm.The superiority of zoom lens is validated.It is concluded that zoom lens preserves the image information better than fix-focus lens and improves the imaging system's performance in this design,which is referential to the design of other optical imaging systems.     

一类单参数假设检验拒绝域的直观构造法

本文提出直观法的理论 ,举出用直观法构造单参数假设检验拒绝域的应用实例 ,并得出构造形如 ( * )式的检验拒绝域的一种方法