Noise Reduction of Welding Defect Image Based on NSCT and Anisotropic Diffusion简

In order to reduce noise effectively in the welding defect image and preserve the minutiae information, a noise reduction method of welding defect image based on nonsubsampled contourlet transform （NSCT） and anisot-ropic diffusion is proposed. Firstly, an X-ray welding defect image is decomposed by NSCT. Then total variation （TV） model and Catte_PM model are used for the obtained low-pass component and band-pass components, respec-tively. Finally, the denoised image is synthesized by inverse NSCT. Experimental results show that, compared with the hybrid method of wavelet threshold shrinkage with TV diffusion, the method combining NSCT with P_Laplace diffu-sion, and the method combining contourlet with TV model and adaptive contrast diffusion, the proposed method has a great improvement in the aspects of subjective visual effect, peak signal-to-noise ratio （PSNR） and mean-square error （MSE）. Noise is suppressed more effectively and the minutiae information is preserved better in the image.     

Method and System for Measuring Spinning YarnTension Using Image Measuring Technique

A non-contact method and system for measuring spinning yarn tension is developed using an image processing technique and based on the theory of yarn balloon dynamics. The theoretical basis of the measurement is the relationship among yarn tension, balloon shape, and spinning parameters. The yarn tension is determined according to the geometric parameters of the balloon, which are measured from an image of the balloon. The digital image is captured with a CCD sensor, and processed in a computer using a wavelet transform technique. A measuring system is developed, and experiments are carried out. The results show that the proposed non-contact method is effective in the on-line measurement of spinning yarn tension for improving the degree of automation of the spinning machine.     

基于图像分解的分层图像修复

We propose a layered image inpainting scheme based on image decomposition.The damaged image is first decomposed into three layers:cartoon,edge,and texture.The cartoon and edge layers are repaired using an adaptive offset operator that can fill-in damaged image blocks while preserving sharpness of edges.The missing information in the texture layer is generated with a texture synthesis method.By using discrete cosine transform(DCT)in image decomposition and trading between resolution and computation complexity in texture synthesis,the processing time is kept at a reasonable level.     

Local data analysis for eliminating end restraint of triaxial specimen

A data processing method was proposed for eliminating the end restraint in triaxial tests of soil. A digital image processing method was used to calculate the local deformations and local stresses for any region on the surface of triaxial soil specimens. The principle and implementation of this digital image processing method were introduced as well as the calculation method for local mechanical properties of soil specimens. Comparisons were made between the test results calculated by the data from both the entire specimen and local regions, and it was found that the deformations were more uniform in the middle region compared with the entire specimen. In order to quantify the nonuniform characteristic of deformation, the non-uniformity coefficients of strain were defined and calculated. Traditional and end-lubricated triaxial tests were conducted under the same condition to investigate the effects of using local region data for deformation calculation on eliminating the end restraint of specimens. After the statistical analysis of all test results, it was concluded that for the tested soil specimen with the size of 39.1 mm × 80 ram, the utilization of the middle 35 mm region of traditional specimens in data processing had a better effect on eliminating end restraint compared with end lubrication. Furthermore, the local data analysis in this paper was validated through the comparisons with the test results from other researchers.     

A medical robot for needle placement therapy in liver cancer

Hepatocellular carcinoma （HCC） is the second most common malignancy in China. As microwave ablation （MWA） is an effective method for liver cancer, a robotic surgical system with ultrasound-directed was designed to assist surgeons on positioning the needles. This robotic system includes a surgical robot with 5 degrees of freedom, a workstation for path-planning and image processing, a conventional 2D ultrasound device, and an electromagnetic （EM） tracking system. Surgery space, clinical operation requirements and optimal mechanical structure are the key factors to be considered in designing a medical robot suitable for use by surgeons. Based on the mechanics of the needle placement robot, we have conducted detailed kinematic analysis, including a combined numerical algorithm and coordinate mapping. Finally, the feasibility of the needle placement robot has been validated by experiment.     

Extraction of color-intensity feature towards image authentication

A color-intensity feature extraction method is proposed aimed at supplementing conventional image hashing algorithms that only consider intensity of the image. An image is mapped to a set of blocks represented by their dominant colors and average intensities. The dominant color is defined by hue and saturation with the hue value adjusted to make the principal colors more uniformly distributed. The average intensity is extracted from the Y component in the YCbCr space. By quantizing the color and intensity components, a feature vector is formed in a cylindrical coordinate system for each image block, which may be used to generate an intermediate hash. Euclidean distance is modified and a similarity metric introduced to measure the degree of similarity between images in terms of the color-intensity features. This is used to validate effectiveness of the proposed feature vector. Experiments show that the color-intensity feature is robust to normal image processing while sensitive to malicious alteration, in particular, color modification.     

Method of Precise Auto Tool Setting for Micro Milling

Based on microscope and image processing, a new method of auto tool setting for micro milling was presented. Firstly, a realtime image of tool setting area was obtained by microscope and CCD camera, then image processing was carried out on this image and the gap between the tool and workpiece was calculated. The gap measurement was sent to motion controlling card to make the tool approach to the surface of workpiece. These steps were repeated until the gap is zero, which means that tool setting was finished. Moreover, a reliability verification test was conducted. Results indicated that the precision of tool setting is satisfactory.     

Depth-aided inpainting for disocclusion restoration of multi-view images using depth-image-based rendering

A new algorithm is proposed for restoring disocclusion regions in depth-image-based rendering （DIBR） warped images. Current solutions include layered depth image （LDI）, pre-filtering methods, and post-processing methods. The LDI is complicated, and pre-filtering of depth images causes noticeable geometrical distortions in cases of large baseline warping. This paper presents a depth-aided inpainting method which inherits merits from Criminisi＇s inpainting algorithm. The proposed method features incorporation of a depth cue into texture estimation. The algorithm efficiently handles depth ambiguity by penalizing larger Lagrange multipliers of flling points closer to the warping position compared with the surrounding existing points. We perform morphological operations on depth images to accelerate the algorithm convergence, and adopt a luma-first strategy to adapt to various color sampling formats. Experiments on test multi-view sequence showed that our method has superiority in depth differentiation and geometrical loyalty in the restoration of warped images. Also, peak signal-to-noise ratio （PSNR） statistics on non-hole regions and whole image comparisons both compare favorably to those obtained by state of the art techniques.     

序列二维医学图象的体绘制法

Volume rendering of 3D data sets composed of sequential 2D medical images has become an important branch in image processing and computer graphics.To help physicians fully understand deep-seated human organs and focuses(e.g.a tumour)as 3D structures.in this paper,we present a modified volume rendering algorithm to render volumetric data,Using this method.the projection images of structures of interest from different viewing directions can be obtained satisfactorily.By rotating the light source and the observer eyepoint,this method avoids rotates the whole volumetric data in main memory and thus reduces computational complexity and rendering time.Experiments on CT images suggest that the proposed method is useful and efficient for rendering 3D data sets.     

Digital Signal Processing Based Real Time Vehicular Detection System

Traffic monitoring is of major importance for enforcing traffic management policies. To accomplish this task, the detection of vehicle can be achieved by exploiting image analysis techniques. In this paper, a solution is presented to obtain various traffic parameters through vehicular video detection system( VVDS). VVDS exploits the algorithm based on virtual loops to detect moving vehicle in real time. This algorithm uses the background differencing method, and vehicles can be detected through luminance difference of pixels between background image and current image. Furthermore a novel technology named as spatio-temporal image sequences analysis is applied to background differencing to improve detection accuracy. Then a hardware implementation of a digital signal processing (DSP) based board is described in detail and the board can simultaneously process fourchannel video from different cameras. The benefit of usage of DSP is that images of a roadway can be processed at frame rate due to DSP‘s high performance. In the end, VVDS is tested on realworld scenes and experiment results show that the system is both fast and robust to the surveillance of transportation.     

转基因烟草感染马铃薯Y病毒脉坏死株系后某些酶活性变化的比较研究

烟草感染马铃薯Y病毒脉坏死株系后,过氧化物酶活性升高,但非转基因敏感烟草升高的幅度大于转基因抗病烟草;同时,非转基固敏感烟草的苯丙氨酸解氨酶和多酚氧化酶活性均增高,并且都出现两个活性高峰,但转基因抗病烟草的苯丙氨酸解氨酶活性仅出现第一个活性高峰,随后其活性值降低并逐渐恢复至未接种时的水平,而多酚氧化酶活性则降低;在未感染PVYN的情况下,转基因抗病烟草的过氧化物酶、苯丙氨酸解氨酶和多酚氧化酶活性均比非转基因敏感烟草高．     

基于图像数据的鞋帮缝制数控代码生成

针对制鞋行业中鞋帮缝制自动化水平不高的问题,提出了一种实现由图像格式到图形格式转化,再由图形格式文件生成数控代码的方法。该方法利用摄像机拍摄鞋帮面图像,经图像处理且运用矢量化算法可实现图像到图形的转换,形成的图形文件经过轮廓偏置处理及后置处理之后生成NC代码,并给出了一个应用实例。     

娄底市旅游形象定位与塑造

在区域旅游开发中,旅游目的地的形象定位与塑造至关重要。从娄底旅游的地理文脉、受众基础及旅游形象现状分析入手,对娄底旅游形象进行定位和设计,定位包括作为国内旅游城市的定位、作为省内旅游城市的定位、作为本市居民旅游目的地的形象定位三个方面,设计包括人—地感知形象设计、人—人感知形象设计两个方面。而娄底旅游形象的传播策略包括形象广告策略、公共关系策略、网络媒介策略、旅游节事活动策略四个方面。     

数控弯管系统仿真功能模块的研究与开发

利用ActiveX技术进行数控弯管机仿真功能的模块化封装.以即插入的方式嵌入到各种现有的数控弯管系统平台中,通过数据库或者文本格式的参数信息进行驱动.该模块能自动建构出三维四边面片仿真网格模型,在仿真中融入可视化交互操作功能,结合物空间和像空间的消隐方法进行弯管模型的二维三视图生成.     

Deadline-aware network coding for video on demand service over P2P networks

INTRODUCTION With the widespread deployment of broadband access, Video-on-Demand (VoD) streaming on the Internet has received increasing attention recently. In VoD service, video streams are delivered to asyn- chronous users with low delay and VCR-like opera- tion support (e.g., pause, fast-forward, and rewind). However, streaming to a large population of clients is very challenging due to the limited server capacity and little deployment of IP multicast in today’s Internet (Quinn a…     

开放式数控及柔性制造实验系统的构建

分析了高校毕业生需要掌握先进制造技术,熟悉先进制造装备的必要性.介绍了柔性制造实验系统的原理、组成和功能,及"NC嵌入PC"型开放式数控系统的结构模式.将柔性制造系统与开放式数控技术有机结合构建出集成的实验系统,并开发出两大类实验体系.     

文化研究的都市性——王府井步行街：中国转型时代的文化图像

王府井步行街的三个方面:街两边的建筑风貌,街上的雕塑内蕴,街中的休闲情味,反映出王府井步行街的文化新质,它以一种视觉文化的方式象征了中国当代社会文化的变化,并且是这一文化变化的图像体现。     

论武昌莲溪寺东吴永安五年佛像的莲花座渊源

长江中下游的汉晋佛教造像中,极为明显的特征之一是佛像的莲花座,这是与长江上游四川地区的汉晋佛像截然不同的一个持点。武昌莲溪寺的东吴永安五年(公元262年)纪年佛像,足踏莲台,莲茎左右各分出一根细枝,枝端有莲花。这是很可能中国纪年造像中出现的首例莲花座,而且是古印度"舍卫城大神变"系列造像的雏形。莲花座,在古印度首先出现于拉克希米和梵天造像,与佛教无关。直到公元三世纪中后期才与佛像造像发生联系,而且,仅限于"舍卫城大神变"系列造像。由此出发,并参照中国古籍文献,可以判断,中国汉晋时期独立出现的莲花图像与佛教的关系无关,不能作为早期佛教传播的证据,当时与佛教有关的仅有长江中下游的莲花座一种。     

Protective effect of recombinant Lactobacillus plantarum against H2O2-induced oxidative stress in HUVEC cells

This study probed the protective effect of recombinant Lactobacillus plantarum against hydrogen peroxide(H_2O_2)-induced oxidative stress in human umbilical vein endothelial cells(HUVECs). We constructed a new functional L. plantarum(NC8-p SIP409-alr-angiotensin-converting enzyme inhibitory peptide(ACEIP)) with a double-gene-labeled non-resistant screen as an expression vector. A 3-(4, 5-dimethyl-2-thiazolyl)-2, 5-diphenyl-2 H-tetrazolium bromide(MTT) colorimetric assay was carried out to determine the cell viability of HUVEC cells following pretreatment with NC8-p SIP409-alr-ACEIP. Flow cytometry(FCM) was used to determine the apoptosis rate of HUVEC cells. Cysteinyl aspartate specific proteinase(caspase)-3/8/9 activity was also assayed and western blotting was used to determine protein expression of B-cell lymphoma 2(Bcl-2), Bcl-2-associated X protein(Bax), inducible nitric oxide synthase(i NOS), nicotinamide adenine dinucleotide phosphate oxidase 2(gp91 phox), angiotensin II(Ang II), and angiotensin-converting enzyme 2(ACE2), as well as corresponding indicators of oxidative stress, such as reactive oxygen species(ROS), mitochondrial membrane potential(MMP), malondialdehyde(MDA),and superoxide dismutase(SOD). NC8-p SIP409-alr-ACEIP attenuated H_2O_2-induced cell death, as determined by the MTT assay. NC8-p SIP409-alr-ACEIP reduced apoptosis of HUVEC cells by FCM. In addition, compared to the positive control, the oxidative stress index of the H_2O_2-induced HUVEC(Hy-HUVEC), which was pretreated by NC8-p SIP409-alr-ACEIP, i NOS,gp91 phox, MDA, and ROS, was decreased obviously; SOD expression level was increased; caspase-3 or-9 was decreased, but caspase-8 did not change; Bcl-2/Bax ratio was increased; permeability changes of mitochondria were inhibited; and loss of transmembrane potential was prevented. Expression of the hypertension-related protein(Ang II protein) in HUVEC cells protected by NC8-p SIP409-alr-ACEIP decreased and expression of ACE2 protein increased. These plantarum results suggested that NC8-p SIP409-alr-ACEIP protects against H_2O_2-induced injury in HUVEC cells. The mechanism for this effect is related to enhancement of antioxidant capacity and apoptosis.     

铜仁城市雕塑建设之我见

铜仁城市雕塑建设一定要尊重地方历史文化传统,尊重少数民族文化,尊重民间艺术,尊重地理环境,真正做到艺以载道,提升铜仁城市形象,美化城市环境之作用。