The relation between color discrimination and color constancy: when is optimal adaptation task dependent?

Color vision supports two distinct visual functions: discrimination and constancy. Discrimination requires that the visual response to distinct objects within a scene be different. Constancy requires that the visual response to any object be the same across scenes. Across changes in scene, adaptation can improve discrimination by optimizing the use of the available response range. Similarly, adaptation can improve constancy by stabilizing the visual response to any fixed object across changes in illumination. Can common mechanisms of adaptation achieve these two goals simultaneously? We develop a theoretical framework for answering this question and present several example calculations. In the examples studied, the answer is largely yes when the change of scene consists of a change in illumination and considerably less so when the change of scene consists of a change in the statistical ensemble of surface reflectances in the environment.     

高效低价、多功能扫描仪Page office color

高效低价、多功能扫描仪Ｐａｇｅ ｏｆｆｉｃｅ ｃｏｌｏｒ由清华紫光扫描仪销售中心总代理的Ｕｍａｘ公司出品的馈纸式扫描仪Ｐａｇｅｏｆｆｉｃｅｃｏｌｏｒ一经上市就博得众多人的青睐。Ｐａｇｅｏｆｆｉｃｅｃｏｌｏｒ秉承扫描仪发展方向，它采用了彩色ＣＣＤＩ作原...     

以小见大的扫描仪——Logitech PageScan color Pro

当电脑越来越深入到人们的工作、学习,甚至日常的生活中时,计算机已不再是高深莫测的东西。而它的周边设备,诸如:打印机、扫描仪、调制解调器等也已成为普通办公与家庭使用的常见设备。作为小型办公与家庭使用的设备,人们要求的是一种简单、灵活、实用、高质量且价格便宜的产品。我们曾经向大家介绍过很多这方面的产品,而我们现在所要介绍的罗技公司推出的这款最新型家庭与办公室用扫描仪Logitech PageScan Color Pro,正是我们一直在寻找的最适合的产品。 罗技电子是1981年成立的一家瑞士公司,主要致力于视觉、听觉、触觉等电脑周边产品的开发工作,其产品非常注重造型的美观及操作的舒适性,主要产品有:各种鼠标器、数控板、WWW及游戏遥控杆、彩色掌上型及馈纸式扫描仪。其率先在业内提出“Senseware”的概念:提供各种人性化的周边输入装置,巧妙地结合硬件及软件功能,使人与电脑沟通更为直接、自然。     

高效、低价、多功能扫描仪Pageoffice color

高效、低价、多功能扫描仪Ｐａｇｅｏｆｆｉｃｅｃｏｌｏｒ正值扫描仪的销售旺季，由清华紫光扫描仪销售中心总代理的Ｕｍａｘ公司出品的馈纸式扫描仪Ｐａｇｅｏｆｆｉｃｅｃｏｌｏｒ一经上市就博得众多人的青睐。Ｐａｇｅｏｆｆｉｃｅｃｏｌｏｒ秉乘扫描仪发展方向，有效...     

惠普Laser JetPro 400 color MFP M475dn

多功能一体机以丰富的功能让办公用户体验到了它的方便与便捷，但由于功能的集中，也让其控制面板密布各种控制按键，有些生产厂商为了让用户能够看的更清楚，将不同的功能分区域设置，但几十个按键有时还会让用户有些不知所措，惠普Laser Jet M475dn用触控屏幕很好地解决了这个问题。     

Structure-based color learning on a mobile robot under changing illumination

A central goal of robotics and AI is to be able to deploy an agent to act autonomously in the real world over an extended period of time. To operate in the real world, autonomous robots rely on sensory information. Despite the potential richness of visual information from on-board cameras, many mobile robots continue to rely on non-visual sensors such as tactile sensors, sonar, and laser. This preference for relatively low-fidelity sensors can be attributed to, among other things, the characteristic requirement of real-time operation under limited computational resources. Illumination changes pose another big challenge. For true extended autonomy, an agent must be able to recognize for itself when to abandon its current model in favor of learning a new one; and how to learn in its current situation. We describe a self-contained vision system that works on-board a vision-based autonomous robot under varying illumination conditions. First, we present a baseline system capable of color segmentation and object recognition within the computational and memory constraints of the robot. This relies on manually labeled data and operates under constant and reasonably uniform illumination conditions. We then relax these limitations by introducing algorithms for (i) Autonomous planned color learning, where the robot uses the knowledge of its environment (position, size and shape of objects) to automatically generate a suitable motion sequence and learn the desired colors, and (ii) Illumination change detection and adaptation, where the robot recognizes for itself when the illumination conditions have changed sufficiently to warrant revising its knowledge of colors. Our algorithms are fully implemented and tested on the Sony ERS-7 Aibo robots.

Supervised texture classification: color space or texture feature selection?

The color of pixels can be represented in different color spaces which take into account different properties. However, no color space is well-suited to the discrimination of all texture databases and the prior determination of such a space is not easy. In this paper, we compare the performances reached by two texture classification schemes that use color spaces: (a) the single color space selection approach, that defines a set of texture features and then selects the color space with which the texture features allow to reach the highest classification accuracy, (b) the multi-color space feature selection (MCSFS) approach, that selects texture features which have been processed from images coded into different color spaces. Experiments carried out with benchmark texture databases show that taking advantage simultaneously of the properties of several color spaces thanks to the MCSFS approach improves the rates of well-classified images with lower learning and decision processing times.     

惠普Laserjet Enterprise 500 color M551xh 彩激创新求变

相对于其他IT产品，近年来打印机产品的设计变化并不算多，因此一旦有创新设计的打印机产品总能给我们留下较深的印象。惠普Laserjet Enterprise 500 color M551xh是惠普在2011年末推出的一款彩色激光打印机，这款产品的创新设计在于它可兼容第三方的ID卡读取设备，为用户升级打印机产品提供了更多的选择。     

打出快感你就喊!——智力游戏color linez随想

一款简单的游戏被奉为经典,那一定是因为其寓意深刻;一款小小的游戏让人如痴如醉,那一定是因为其妙不可言。就象电影《食神》里,周星星能够把小小的蛋炒饭作到让人爽彻心脾,那才佩得上“食神”的头衔一样,我也常常以为,创作出colorlinez的人必定是一个大师级的人物。初次见识colorlinez,人们应当是很难与其一见投缘的,显然,这个表面看来酷似俄罗斯方格的小游戏,在琳琅满目恒河沙数各具特色的游戏殿堂里,不过是一颗小小的含羞草而已。同色、小球、排列、成线、消除、再排列……再简单不过的玩法,让所有的玩家在学习游戏规则过程中省略了较多…     

Neural network’s selection of color in UI design of social software

Neural Computing and Applications - In recent years, the design of social software UI has become a design research focus in the field of design. Color affects many factors in UI design. However,...     

商务精彩打印解决之道——HP color inkjet CP1700喷墨打印机

应用需求:在目前的商务办公应用中,统计图表、投标方案、照片等彩色打印工作日渐频繁。专业的图像设计更是离不开彩色打印。普通激光打印机的黑白输出效果无法满足用户这方面打印需求,而彩色激光打印机不仅昂贵,而且对于专业的图像设计用户来说,其彩色输出效果也无法满足要求。在这种状况下,面向商务和专业设计应用的彩色喷墨打印机就成为了用户理想的选择。     

Driver’s eye blinking detection using novel color and texture segmentation algorithms

In this paper we propose a system that measures eye blinking rate and eye closure duration. The system consists of skin-color segmentation, facial features segmentation, iris positioning and blink detection. The proposed skin-segmentation procedure is based on a neural network approximation of a RGB skin-color histogram. This method is robust and adaptive to any skin-color training set. The largest remaining skin-color region among skin-color segmentation results is further segmented into open/closed eyes, lips, nose, eyebrows, and the remaining facial regions using a novel texture segmentation algorithm. The segmentation algorithm classifies pixels according to the highest probability among the estimated facial feature class probability density functions (PDFs). The segmented eye regions are analyzed with the Circular Hough transform with the purpose of finding iris candidates. The finial iris position is selected according to the location of the maximum correlation value obtained from correlation with a predefined mask. The positions of irises and eye states are monitored through time to estimate eye blinking frequency and eye closure duration. The method of the driver drowsiness detection using these parameters is illustrated. The proposed system is tested on CCD and CMOS cameras under different environmental conditions and the experimental results show high system performance.     

A full linear 3 × 3 color correction between images

Journal of Real-Time Image Processing - This work presents a novel color correction algorithm between images (or image regions) depicting the same environment. Color transfer is achieved by a...     

Color invariant chroma keying and color spill neutralization for dynamic scenes and cameras

In this article we show how temporal backdrops that alternately change their color rapidly at recording rate can aid chroma keying by transforming color spill into a neutral background illumination. Since the chosen colors sum up to white, the chromatic (color) spill component is neutralized when integrating over both backdrop states. The ability to separate both states additionally allows to compute high-quality alpha mattes. Besides the neutralization of color spill, our method is invariant to foreground colors and supports applications with real-time demands. In this article, we explain different realizations of temporal backdrops and describe how keying and color spill neutralization are carried out, how artifacts resulting from rapid motion can be reduced, and how our approach can be implemented to be compatible with common real-time post-production pipelines.     

商务精彩打印解决之道——HP color inkjet CP1700喷置打印机

应用需求：在目前的商务办公应用中，统计图表、投标方案、照片等彩色打印工作日渐频繁，专业的图像设计更是离不开彩色打印。普通激光打印机的黑白输出效果无法满足用户这方面打印需求，而彩色激光打印机不仅昂贵，而且对于专业的图像设计用户来说，其彩色输出效果也无法满足要求。在这种状况下，面向商务和专业设计应用的彩色喷墨打印机就成为了用户理想的选择。应用环境：HP color inkje和CP1700喷圣打印机是一款专门为中小企业和专业设计人员而设计的彩色喷圣打印机，它可以在各种不同类型的介质上实现专业品质的A3+超宽幅打印，同时还可实现专业的彩色商业文档、演示稿、市场推广资料、海报、模型图以及设计图样打印。     

Stable α-CsPbI3 with extremely red emission for expanding the color gamut

The wider color gamut represents the better reproducibility of the real natural colors. Perovskite materials exhibit promising potential in full-color wide-gamut displays because of the wide tunability and high saturability of their photon emission. However, the full-color wide gamut(>100% Rec.2020) has not been constructed due to the lack of the extreme red primary color(～700 nm). Herein, the widest color gamut is realized, whereinα-CsPbI3 is used to generate the extreme red primary color. A...     

普雷斯顿·贝利：他为你还原爱情——多乐士2012年color futures色彩跨界合作之旅

普雷斯顿·贝利（Preston Bailey）：美国著名宴会设计大师，好菜坞明星御用婚宴大师，被誉为美国顶级花艺家，是完美婚礼的制造者，全球范围内婚礼设计师的标杆，在美国近2000所学院和网络上开设了“婚礼及活动策划课程”。     

惠普LaserJet Pro CM1415fn color MFP彩色激光多功能一体机由触控所引发的变化

为了用户更加直观地操作,无论是喷墨多功能一体机还是激光多功能一体机,大多都在控制面板上设置了液晶显示屏。一般简单的液晶显示屏仅能显示两行文字,复杂一些的则支持彩色图像显示。彩色触控显示屏幕以往只是在高端数码复合机上较为常见,除此之外也仅仅在几款高端家用喷墨多功能一体机上曾经看到过类似的设计,