基于内容的图象检索技术

本文对基于内的图象检索理论进行了深入的研究，给出了图象检索的基本过程，常用方法，匹配算法和提高检索效率的方法。     

多媒体课件制作程序实例分析

本文介绍了如何用数学公式曲线绘图 ,复杂动画、教学课件制作及程序设计     

纹理映射技术

讨论了光照明模型对计算机真实感图形绘制的重要性 ,并深入讨论了纹理映射技术在计算机真实感图形绘制中的应用。     

相关组分在制造硒硫化镉颜色玻璃中的作用

在制造硒硫化镉颜色玻璃时，除了加入玻璃的基本组成SiO2和着色剂CdS、Se外，还必须加入ZnO、碱金属氧化物、冰晶石、B2O3和重金属硫化物等次要组分。这些次要组分在制造硒硫化镉颜色玻璃过程中起着重要作用。ZnO对防止着色剂硒和硫的挥发起直接作用，是制造硒硫化镉颜色玻璃不可缺少的组分之一。碱金属氧化物、冰晶石、B2O3主要直助熔作用，降低玻璃熔制温度，加速玻璃的澄清和均化，间接防止着色剂硒和硫的挥发，微量重金属硫化物作为晶核形成剂，使CdS(Se）微晶固溶体容易成核和长大，加速并简化玻璃的显色工艺。     

有机颜料晶体行为和颜色性能的关系——Ⅱ.汉沙黄系列有机颜料

合成了五个汉沙黄颜料品种,选择系列有机溶剂进行重结晶,通过X-射线粉末衍射技术考察了它们的晶体行为,关联了它们颜色性能。发现C.I.颜料黄1和经甲苯处理的C.I.颜料黄5互为异质同晶体,C.I.颜料黄4和C.I.颜料黄5均存在同质异晶现象,其中β-C.I.颜料黄4及γ、δ-C.I.颜料黄5三种晶型还未见有文献报道。结果表明,有机颜料晶体形态的变化将直接影响颜料的颜色性能。     

Color Matching for Fiber Blends Based on Stearns-Noechel Model

IntroductionMany industrial applications use blends of coloredfibers to produce special effects such as nonsolid or mottledappearance[1].In this case ,it is i mportant to predict theproportions of colored fibers in a blend. Up to now,thecolor mixing behaviour of pre-colored fiber blends has beendescribed in some papers , various empirical and semi-empirical methods are developed to color matching processof pre-colored fiber blends . Only Datacolor InternationalCompany has the commercial soft…     

A flower image retrieval method based on ROI feature

Flower image retrieval is a very important step for computer-aided plant species recognition. In this paper, we propose an efficient segmentation method based on color clustering and domain knowledge to extract flower regions from flower images. For flower retrieval, we use the color histogram of a flower region to characterize the color features of flower and two shape-based features sets, Centroid-Contour Distance (CCD) and Angle Code Histogram (ACH), to characterize the shape features of a flower contour. Experimental results showed that our flower region extraction method based on color clustering and domain knowledge can produce accurate flower regions. Flower retrieval results on a database of 885 flower images collected from 14 plant species showed that our Region-of-Interest (ROI) based retrieval approach using both color and shape features can perform better than a method based on the global color histogram proposed by Swain and Ballard (1991) and a method based on domain knowledge-driven segmentation and color names proposed by Das et al.(1999).     

蔬菜采后防失水

新鲜蔬菜的含水量可达65%～96%,但在采后贮藏和运输过程中会逐渐失水萎蔫,使产品重量不断减少,直接造成经济损失.此外,当蔬菜失水5%时就会出现萎蔫和皱缩,虽然没有达到萎蔫程度,但是失水已影响到其口感、脆度、颜色和风味.