基于用户体验的标签云可视化布局研究

标签云作为一种可视化导航接口在网络上愈加流行,云中标签可视化属性可以对用户浏览产生一定的导向作用,从而把用户的关注点吸引到特定字段或区域。但是目前,研究人员对标签云属性的导向作用知之甚少。文章围绕不同的标签云可视化布局对用户浏览的影响程度进行研究,通过标签有无背景颜色、标签密集程度、用户对标签的熟悉程度、标签背景颜色亮暗等实验,分析不同的可视化属性对用户的影响程度。在今后的标签云设计中可以根据不同人群有针对性地改变权重高的特性,使用户在标签云交互中具有导向性和高效、完美的体验效果。     

Salient structural elements based texture synthesis

Salient structural elements are ubiquitous in natural textures, and their distribution exhibits some stochastic distribution features. Current texture synthesis algorithms can neither preserve the integrity of the elements nor capture this distributive information. We present an algorithm to treat this high-level visual information. Here, we address the issue by taking specific care of the structural elements. Our texture synthesis process grows the target texture one structural element at a time. A Markov ...     

构成主义实践对现代视觉传达设计的影响

现代视觉传达设计已经成为我们生活的重要组成部分。以视觉为中心的视觉文化符号传播系统正向传统的语言文化符号传播系统提出挑战。俄国构成主义以及莫霍利·纳吉等在构成主义实践中对理性的思考、形式的挖掘、画面信息的强调和视觉经验的突破,深刻影响着现代视觉传达设计,并为其确立了操作的规范。     

Using a Visual Attention Model to Improve Gaze Tracking Systems in Interactive 3D Applications

This paper introduces the use of a visual attention model to improve the accuracy of gaze tracking systems. Visual attention models simulate the selective attention part of the human visual system. For instance, in a bottom‐up approach, a saliency map is defined for the image and gives an attention weight to every pixel of the image as a function of its colour, edge or intensity. Our algorithm uses an uncertainty window, defined by the gaze tracker accuracy, and located around the gaze point given by the tracker. Then, using a visual attention model, it searches for the most salient points, or objects, located inside this uncertainty window, and determines a novel, and hopefully, better gaze point. This combination of a gaze tracker together with a visual attention model is considered as the main contribution of the paper. We demonstrate the promising results of our method by presenting two experiments conducted in two different contexts: (1) a free exploration of a visually rich 3D virtual environment without a specific task, and (2) a video game based on gaze tracking involving a selection task. Our approach can be used to improve real‐time gaze tracking systems in many interactive 3D applications such as video games or virtual reality applications. The use of a visual attention model can be adapted to any gaze tracker and the visual attention model can also be adapted to the application in which it is used.     

Cross‐talk acceptability in natural still images for different (auto)stereoscopic display technologies

Abstract— One of the most annoying distortions in (auto)stereoscopic displays is probably cross‐talk, visible as double edges, which is mainly caused by an imperfect separation of left‐ and right‐eye images. For different types of three‐dimensional (3‐D) displays, cross‐talk is caused by different origins, which could result in different levels of perceived image distortion. To evaluate the influence of (auto)stereoscopic display technology on cross‐talk perception, optical measurements and subjective assessments were performed with three different types of 3‐D displays. It is shown with natural still images that the 3‐D display technology with the lowest luminance and contrast level tolerates the highest level of cross‐talk, while still maintaining an acceptable image‐quality level.     

基于TS201的CPCI嵌入式视频采集卡硬件设计

针对视觉跟踪系统中数据量大、运算量大和实时性高的特点,选用片内存储器高达24M bits,主频高达600MHz的ADSP-TS201处理器作为运算核心,设计了视频采集与处理专用硬件平台,同时配以现场可编程门阵列FPGA实现逻辑控制,选用便于机载和舰载的CPCI总线完成本系统与上位机的数据传输;指出了设计中需要注意的问题,并讨论了其中一些关键部分的具体实现;经过实际测试验证,本硬件平台设计正确合理,运算能力强大,达到了设计要求。     

论信息学科平台课程群立体可视化教育资源体系的构建

介绍了项目组围绕信息学科平台课程群立体化教育的教学理念、模式、教材、资源和方法,阐述如何构建信息学科平台课程群的立体可视化优质教育资源体系,培养学生的IT应用开发能力和软件设计能力。     

Dynamic feedback robust stabilization of nonholonomic mobile robots based on visual servoing

This paper investigates the visual servoing robust stabilization of nonholonomic mobile robots. The calibration of visual parameters is not only complicated, but also needs great consumption of calculated time so that the accurate calibration is impossible in some situations for high requirement of real timing. Hence, it is interesting and important to consider the design of stabilizing controllers for nonholonomic kinematic systems with uncalibrated visual parameters. A novel uncertain model of these nonholonomic kinematic systems is proposed. Based on this model, a stabilizing controller is discussed by using dynamic feedback and two-step techniques. The proposed robust controller makes the mobile robot image pose and the orientation converge to the desired configuration despite the lack of depth information and the lack of precise visual parameters. The stability of the closed loop system is rigorously proved. The simulation is given to show the effectiveness of the presented controllers.     

浅析插画艺术中的潜意识表现

插画创作需要创新,创新来自灵感,灵感需要突发,需要潜意识的表现,超常规非现实、从潜意识的深渊流溢出的灵感在插画艺术中的运用赋予了受众丰富的想象空间。插画艺术的创作应该用形象语言说话,将现实的插画艺术通过潜意识的表现,丰富思维转化成视觉元素。本文在于正确认识和激发潜意识,在创作时不断地用充满希望与期待的画面与潜意识交谈,让我们的插画艺术更具识别和视觉冲击力。