纹理图像的局部区域提取方法

纹理分析是图像处理与识别的重点和难点之一。综合运用数字图像处理和计算机视觉技术,应用VC++开发环境,以竹材横截面细胞壁晶区为具体研究对象,通过应用各种结构微型窗口,比较近距离点之间像素值的方法将图像进行分割,再运用数学形态学的方法对图像进行增强处理,将人们感兴趣的区域孤立出来,以方便对所需区域进行形状描述、收集信息和求取图像特征参数。所开发的程序可以取得较好的纹理分析效果,其界面友好、使用方便。     

基于可分离性判据的自适应加权纹理图像分割*

进行自适应加权,以提高可分离性好的特征在分类中所起的作用,使加权后的特征具有更好的分类效果。实验表明,该方法的分割结果比未加权的效果要好。     

项目CAID装饰设计子系统的研究与应用*

阐述了装饰设计在产品设计中的作用及计算机辅助装饰设计的类型。针对不同的装饰类型提出了不同的解决方案;对于色带装饰采用基于纹理映射的方法;对于标志装饰,提出了非矩形贴图算法。自行开发了CAID软件系统中的装饰设计子系统。经实际应用证明,该系统可有效地辅助工业设计师进行装饰设计。     

表面活性剂对锡镀层织构和形貌的影响

以化学镀非晶态镍磷合金和多晶铜片为墓底，研究分析了聚乙二醇辛基苯基醚(Triton X-100)、聚乙二醇(相对分子质量6000)(PEG)和明胶三种表面活性剂对硫酸体系锡镀层结构和表面形貌的影响。锡镀层的织构和表面形貌与表面活性剂的种类和基底的性质有关。Triton X-100使Ni-P合金基底沉积的镀层以β-Sn的(220)晶面择优，铜基底上则以(200)晶面择优，并使晶体细化均匀。PEG使Ni-P上的镀层以(220)晶面为主，在多晶铜基底上变为(211)晶面为主，晶粒的大小不均匀。在含明胶的镀液中，两种基底上的镀层的主要衍射峰都是(101)晶面的衍射峰，但表面形貌有很大的变化。     

Surface exploration using laparoscopic surgical instruments: The perception of surface roughness

During laparoscopic surgery video images are used to guide the movements of the hand and instruments, and objects in the operating field often obscure these images. Thus, surgeons often rely heavily on tactile information (sense of touch) to help guide their movements. It is important to understand how tactile perception is affected when using laparoscopic instruments, since many surgical judgements are based on how a tissue ‘feels’ to the surgeon, particularly in situations where visual inputs are degraded. Twelve naïve participants used either their index finger or a laparoscopic instrument to explore sandpaper surfaces of various grits (60, 100, 150 and 220). These movements were generated with either vision or no vision. Participants were asked to estimate the roughness of the surfaces they explored. The normal and tangential forces of either the finger or instrument on the sandpaper surfaces were measured. Results showed that participants were able to judge the roughness of the sandpaper surfaces when using both the finger and the instrument. However, post hoc comparisons showed that perceptual judgements of surface texture were altered in the no vision condition compared to the vision condition. This was also the case when using the instrument, compared to the judgements provided when exploring with the finger. This highlights the importance of the completeness of the video images during laparoscopic surgery. More normal and tangential force was used when exploring the surfaces with the finger as opposed to the instrument. This was probably an attempt to increase the contact area of the fingertip to maximize tactile input. With the instrument, texture was probably sensed through vibrations of the instrument in the hand. Applications of the findings lie in the field of laparoscopic surgery simulation techniques and tactile perception.     

一种基于二维Brushlet变换的纹理图像检索方法

提出一种利用Brushlet变换分解图像,提取纹理特征进行图像检索的新方法。该方法利用Brushlet的特性,成功地检测到了纹理图像的方向信息,弥补了小波变换的不足,从而形成能够精确表征图像的特征矢量。匹配算法则使用比值相似度。实验结果表明,该方法计算简单、有效、检索效果较好。     

基于关联规则挖掘的图像检索

针对图像检索中图像相似性判断所面临的"语义鸿沟"问题,本文提出了基于关联规则挖掘的图像检索。该方法利用数据挖掘技术,对图像纹理的各种低层可视化特征进行分析挖掘,获得一系列的图像低层特征值与高层概念之间的各种规则,将这些规则构成图像知识库,并与概念集合相对应。实验结果表明,采用关联规则挖掘能很好的提高图像检索的准确率。     

虚拟环境中的织物纹理映射算法

在织物动态模拟中，纹理映射是实现真实感的关键。该文采用了质点-弹簧模型进行建模，提出一种快速、实用的方法，把纹理空间中的三角形单元映射到景物空间中三角形单元上，并实现了反走样。实验结果表明，该算法达到了较好的实时性和真实感。