我国长春光机物理所研制成功彩色激光电视机

9月上旬吉林省科技厅宣布，长春光机物理所开发出具有自主知识产权、独具特色的60英寸“投影式”激光全彩色视频显示原理样机，已申请7项专利，其中1项为国际发明专利。业内人士认为，彩色激光电视原理样机的研制成功，标志着我国已进入国际彩色激光电视的先进行列，为抢占彩色激光电视产业制高点奠定了坚实基础。     

关注产品：彩色电视机

产品简介 彩色电视机是用于接收彩色电视节目的接收机,也是实现图像信息还原的显示终端。根据显示方式的不同,目前有3种类别的彩色电视机,分别为阴极射线管彩色电视机（CRT电视）、液晶彩色（LCD电视）电视机和等离子彩色电视机（PDP电视）,后两种也称平板电视。     

数字电视——二十一世纪的电视

一、引言电视从本世纪３０年代出现以来，经历的最大一次技术变革是５０年代的从黑白到彩色，此后，电视技术基本没有重要的革新。然而，到了９０年代，由于数字技术的发展及图像压缩编码技术取得的突破，才使电视技术的发展迎来了一个新时代——数字电视时代。在数字电视...     

彩色复印机及其数字化倾向

彩色复印机及其数字化倾向在１９６９年的ＰＭＡ年度会议上，３Ｍ公司推出了第一台彩色复印机（ｃｏｌｏｒ－ｉｎ－ｃｏｌｏｒ）。２５年以后，“与数字相结合”——以数字形式融合通信、计算机和电视技术——已成为热门话题。就其组成而言，彩色复印机已经从只能单纯复印...     

低反差、高转录效能的柯达电视(传送)电影彩色正片5381/7381

柯达最近推出了电视传送电影专用彩色正片５３８１／７３８１——超低反差的彩色正片,它专门用于转录电视电影片,易于获得良好的影像质量。在加工中的每一步,它都带给你前所未有的简便性和令你满意的新的质量水平。在洗印车间,这种胶片与伊斯曼ＥＸＲ彩色正片５３８６...     

我国长春光机物理所研制成功彩色激光电视机

9月上旬吉林省科技厅宣布 ,长春光机物理所开发出具有自主知识产权、独具特色的 6 0英寸“投影式”激光全彩色视频显示原理样机 ,已申请 7项专利 ,其中 1项为国际发明专利。业内人士认为 ,彩色激光电视原理样机的研制成功 ,标志着我国已进入国际彩色激光电视的先进行列 ,为抢占彩色激光电视产业制高点奠定了坚实基础。据了解 ,目前国际上开发的激光电视主要采用“直扫描”和“线扫描”方式 ,且均是样机 ,尚未形成产品。德国LDT公司、韩国三星公司采用点扫描式 ,日本索尼公司采用线扫描式 ,均存在着光扫描、光调制及其精确同步等技术瓶颈问…     

液晶显示技术简介

液晶显示技术简介液晶显示（ＬＣＤ）因具有薄、轻、省电等特点，其应用范围正不断扩大。近年来，随着全彩色液晶显示技术的发展，液晶显示已广泛用于电视、摄像机、车用导航器、计算机、语言处理机、办公自动化设备等各个方面，越来越受到世人的关注。这里对彩色液晶显示...     

显像管防爆带耳环断裂分析

电视彩色显像管防爆带耳环在进行振动疲劳试验中失效，对其断口进行了宏观，微观分析，确定断裂源在冲压折痕与基体连接的过渡区，断裂性质系纯机构疲劳损伤，与装机试验等因素有关。     

内偏转彩色显像管

对内偏转彩色显像管技术进行了详细论述。分析了材料的真空放气特性对阴极寿命的影响。由于偏转线圈放在管内，不能用传统的管球与线圈装配程序进行装配。为了得到好的着屏和会聚质量，设计了特殊的装配步骤。给出了１４英寸和２１英寸电视机（ＴＶＴｓ）用以及２１英寸彩色监视器（ＣＭＴｓ）用内偏转管的分析测试结果。     

实时电视测量系统中值滤波器设计

在电视测量系统中，为了有效可靠地对目标进行跟踪，测量，有必要对ＣＣＤ传感器输入图象信号进行滤波处理，提高图象信号的信噪比，本文中采用一种适合于硬件实现的流水线中值滤波算法，利用快速ＲＡＭ器件和ＦＰＧＡ器件，完成８ｂｉｔ灰度图象３×３窗口任意形状中值滤波器。并给出理论分析和实验结果，整个电路去噪效果明显。     

同色异谱黑在光谱降维中的应用研究

目的研究同色异谱黑在光谱降维中的应用。方法基于同色异谱黑光谱特性提出MBPCA光谱降维法。该方法将颜色光谱分解为基本光谱和同色异谱黑光谱,基本光谱的基向量由原始光谱通过PCA法得到的前3个基向量构成,原始光谱与基本光谱之间的残余光谱作为同色异谱黑光谱,其基向量由残余光谱通过PCA法推导。结果当降维光源与实际光照光源一致时,只要基向量数目超过3个,其低维模型的色度精度皆为0,当用6个基向量重构光谱时,在4种标准光源下的平均色差接近于1。结论 MBPCA法与PCA法相比,其光谱重构精度与PCA法接近,色度精度比PCA法有明显提高,其六维模型能有效满足光谱颜色复制的需要。     

Improved linear programming method to generate metameric spectral distributions

We present an application of linear-programming techniques to generate metameric spectral radiant power distributions. Conditions concerning physical color properties, dominant wavelength, and excitation purity lead us to propose criteria that provide distributions associated with color stimuli with high-excitation purity values of any brightness. An unlimited number of metameric distributions can be obtained from the degrees of freedom introduced by the proposed criteria.     

Producing illumination-independent additively mixed colors by diffractive optics

We apply transmission gratings under Littrow incidence to produce polychromatic colors by additive color mixing. Parametric optimization of gratings is employed to produce high efficiency. In addition, we show that the system can yield the same color from a wide variety of spectra; i.e., the system can produce metameric colors.     

多色打印中基于光谱的油墨选择——最佳油墨选择

描述了从给定油墨库中选择出一组八色油墨,建立最小化同色异谱的八色光谱打印模型的油墨选择算法.对于一个含有n种油墨的油墨库,这里有Cn8种油墨组合,当n很大时,油墨组合的数量就成了几何数字.有些明显不可能的油墨组合,通过解析法可以去除.首先,使用向量相关性分析法来去除没有可行性的组合.然后,用连续调相似评估每一备选油墨组的色度和光谱精确度.选择备选油墨组中对应有光谱精确度最高的一组油墨,定为八色打印过程的最佳油墨组以获取最小同色异谱的色彩复制.     

Generalized spectral decomposition: a theory and practice to spectral reconstruction

The generalized spectral decomposition (GSD) theorem is introduced, and the generalized fundamental stimulus and metameric black are analyzed to show how they convey the valuable features in terms of color information. The suggestion would be considered as the generalization of Cohen and Kappauf's matrix R theory and its later application in parameric correction by Fairman. The GSD theorem provides a modular model whose arguments can be elaborately set up for high-performance spectral recovery. It is also shown that the suggested methods for spectral decomposition and/or spectral reconstruction proposed by different researchers could be considered as special cases of GSD.     

Frequency of metamerism in natural scenes

Estimates of the frequency of metameric surfaces, which appear the same to the eye under one illuminant but different under another, were obtained from 50 hyperspectral images of natural scenes. The degree of metamerism was specified with respect to a color-difference measure after allowing for full chromatic adaptation. The relative frequency of metameric pairs of surfaces, expressed as a proportion of all pairs of surfaces in a scene, was very low. Depending on the criterion degree of metamerism, it ranged from about 10(-6) to 10(-4) for the largest illuminant change tested, which was from a daylight of correlated color temperature 25,000 K to one of 4000 K. But, given pairs of surfaces that were indistinguishable under one of these illuminants, the conditional relative frequency of metamerism was much higher, from about 10(-2) to 10(-1), sufficiently large to affect visual inferences about material identity.     

Improving the performance of computer color matching procedures

A premise was set up entailing the possibility of a synergistical combination of advantages of spectrophotometric and colorimetric matching procedures. Attempts were therefore made to test the performances of fifteen matching procedures, all based on the Kubelka-Munk theory, including two procedures utilizing the fundamental color stimulus R(FCS) of the spectral decomposition theory. Color differences CIE DeltaE(00) as well as concentration differences DeltaC(AVE) were used to theoretically rank the fifteen color matching procedures. Results showed that procedures based on R(FCS) were superior in accurately predicting colors and concentrations. Additionally, the metameric black component R(MB) of the decomposition theory also showed promise in predicting degrees of metamerism. This preliminary study, therefore, provides evidence for the premise of this investigation.     

应用多通道脉冲噪声检测的彩色图像自适应中值滤波方法

首先对彩色图像RGB 3个颜色通道的子图像,以串行的方式,确定出各颜色通道的脉冲噪声位置。根据待检测像素点附近4个邻域的灰度均值,自适应调整脉冲噪声判断阈值。由各通道的噪声检测结果经运算得到彩色图像脉冲噪声检测结果。采用改进的自适应矢量中值滤波法,对脉冲噪声有选择地滤除。实验结果表明,该方法结合标量方法进行脉冲噪声检测,矢量方法滤除彩色图像中的脉冲噪声,具有较好的滤波性能指标和视觉效果。     

Active metameric security devices using an electrochromic material

In order to increase the anticounterfeiting performance of interference security image structures, we propose to implement an active component using an electrochromic material. This novel device, based on metamerism, offers the possibility of creating various surprising optical effects, it is more challenging to duplicate due to its complexity, and it adds a second level of authentication. By designing optical filters that match the bleached and colored states of the electrochromic device, one can obtain two hidden images-one appearing when the device is tilted, and the other one disappearing when the device is colored under an applied potential. Specifically, we present an example of a filter that is metameric with the colored state of the electrochromic device, demonstrate how the dynamic nature of the device offers more fabrication flexibility, and discuss its performance. We also describe a design methodology for metameric filters based on the luminous efficiency curve of the human eye: this approach results in filters with a lower number of layers and hence lower fabrication costs, and with a lower color difference sensitivity under various illuminants and for nonstandard observers.     

Optical and tribomechanical stability of optically variable interference security devices prepared by dual ion beam sputtering

Optical security devices applied to banknotes and other documents are exposed to different types of harsh environments involving the cycling of temperature, humidity, chemical agents, and tribomechanical intrusion. In the present work, we study the stability of optically variable devices, namely metameric interference filters, prepared by dual ion beam sputtering onto polycarbonate and glass substrates. Specifically, we assess the color difference as well as the changes in the mechanical properties and integrity of all-dielectric and metal-dielectric systems due to exposure to bleach, detergent and acetone agents, and heat and humidity. The results underline a significant role of the substrate material, of the interfaces, and of the nature and microstructure of the deposited films in long term stability under everyday application conditions.