最新刊期
卷 5 ， 期 8 ， 2000
- 摘要：The present situation of Near-field Optical Microscopy (NFOM) is introduced. There are three main kinds in NFOM: a small aperture scanning near-field optical microscope(A-SNOM), apertures tip scattering scanning near-field optical microscope (S-SNOM) and photon scanning tunneling microscope (PSTM). According to the beam transmitted or reflected from sample, A-SNOM and S-SNOM are classified into A-SNOM(T) or A-SNOM(R), and S-SNOM(T) or S-SNOM(R) except PSTM (only Transmitted). The simple imaging principles and specialities of them are presented and compared. The progress of PSTM in our research group are presented. The simulation and experimentation of the false image eliminated PSTM are completed. The FWHM of the line-spread function of 2.8nm in our experiment have been obtained at the first. The keys of super-resolution of NFOM are concluded at last.关键词：Near-Field optics;SNOM;S-SNOM;PSTM2280|205|0更新时间：2024-05-08
- 摘要：A vision-based auto-guided vehicle system (AGVS) is introduced in the paper. Compares to the traditional cable guided vehicle, vision-based vehicle can adapt better to modern FMS (Flexible Manufacturing System). A white line marker-detecting algorithm, in which the maximum square error method is used to calculate the white line marker gray level threshold, is introduced in the paper. The vision system of the AGVS used in the paper gives deformation in the white line image, so it needs to rectify the white line image deformation before we get correct information about the white line from the image. An algorithm is proposed for this purpose. On the crossroad, the line is numbered to differentiate the different roads. Image templates matching method is used to recognize the different numbers, which represent the different roads at the crossroad. Then AGVS can use the road numbers to decide which road the car should go along.关键词：Crossroad;Image recognition;Vision-based guiding2241|180|0更新时间：2024-05-08
- 摘要：A method of 3-D information detection of weld seam facts based on X-ray image has been developed. There are problems in the fact detection on the X-ray 2-D projection of weld seam, which the cracks along the projection direction and the concave holes on the surface of weld seam may be recognized as the air holes and the thin area facts(the cracks and nonpenetrate solder) may not be detected. The problems can be avoided in the method of 3-D information detection. The paper discusses the imaging approaches and the light models. An iterative algorithm of 3-D information detection of the facts has been constructed. This algorithm has been simplified greatly by parameterization of the fact models using the form knowledge about the facts.关键词：Image processing;3-D reconstruction;Non-destructive testing2301|190|0更新时间：2024-05-08
- 摘要：This paper presents a novel digital image information hiding echeme which based on digital image scrambling and amalgamation. Firstly, this paper introduces how to realize digital image scrambling and amalgamation. Secondly, this paper presents a new kind of digital image information hiding schemes. In the scheme, scrambling technology is used as pre-process and post-process of digital image information hiding, and amalgamation is used to hide an image into the other one. At last, this paper discusses how to use the scheme into the research area of digital image sharing and digital image watermarking. Examples show that the scheme could be expediently realized and it is robust in a certain extent.关键词：Digital image information hiding;scrambling;Amalgamation;Image sharing;digital watermark2555|205|0更新时间：2024-05-08
- 摘要：In this paper, First papers about multistage vector quantization (MSVQ) and Simulated annealing (SA) technique were consulted, based on a multistage vector quantization and Simulated annealing technique, we researched optimal codebook conditions of VQ, and present the algorithm of multistage vector quantization based on simulated annealing(SA-MSVQ). The scheme give full play to MSVQ and SA' s merits for image coding, counteract own weakness of multistage vector quantization based on simulated annealing. Theory and experimental results show that not only computation and storage is significantly lower, but also obtained a good image resume under the high compress ratio.关键词：vector quantization;Image coding;codebook;simulated annealing2018|180|0更新时间：2024-05-08
- 摘要：K-means algorithm applied in vector quantization strongly depends on the selection of the initial codebook, and if not given a good initial codebook it can easily be trapped in local minima. Furthermore, Bezdek's fuzzy K-means algorithms are computationally expensive so that they are impractical in codebook design. So, people have been researching those algorithms which can achieve good performance in the convergent speed of algorithms and the quality of the reconstructed image. Analyzing the fuzzy vector quantization algorithm (FVQ) presented by Nicolaos.B.K. and aiming at the irrational convergent procedure of the algorithm, from the aspect of convergent structure and strategy the paper presents a dynamic fuzzy vector quantization algorithm (DFVQ) and gives two concrete methods based on the idea of the presented algorithm. Experiments show the presented methods markedly accelerate the convergent procedure and improve the quality of convergence.关键词：Image code;vector quantization;Dynamic convergence2335|204|0更新时间：2024-05-08
- 摘要：Quantization plays special important roles in image compression system,and its structure and parameters directly influence the quality of reconstructed image and the compression ratio.In our study of Compression System of 3D hyperspectral images,we have disigned two quantization:one as of 1-D arctangnet mapping quantization,the other as of 2-D image edge retaining quantization.The experiment results showed that mapping quantizing error in mapping quantization was low and could better retain the edge feature in hyperspectral image.关键词：3D hyperspectral images;Quantization;Image edge feature2003|205|0更新时间：2024-05-08
- 摘要：In order to extract the contour of active image effectively, this paper gives a method using Snkaes model, while initial contour of every frame is predicted by optical flow. With this improved method, Snkaes model has better performance for contour extraction of active image. Finally, the given algorithm is tested on several images. Comparison is made with standard Snkaes method.关键词：Snkaes model;optical flow;Active image;Contour extraction2301|200|0更新时间：2024-05-08
- 摘要：Traditional LP algorithm based-on stack processing lies in two disadvantages for finding optimal solution of nonlinear filters: (1) Joint statistics of the signal and noise processes must be known; (2) The complexity of the LP increases faster than exponentially as a function of the window size. Base-on optimal stack filtering theory, the multi-stage adaptive WOS filter is proposed by expressing the PBF of WOS filter in term of linear separate function. Above disadvantages can be overcome by this algorithm, therefore, the class of filter is suitable to image processing.关键词：nonlinear filtering;Weight order statistics;Stack filter;Threshold decomposition2162|198|0更新时间：2024-05-08
- 摘要：This paper presents a class of adaptive ranked-order morphological filters. The implicit formula of the order operation is expressed. The adaptive processing of structuring element and percentile is implemented based on a minimizing criterion such as the mean square error (MSE) or the mean absolute error (MAE). The filters can not only efficiently suppressed various noise in signals but also preserved the geometrical features of signals. The results of computer simulation show that the new filtering method is quite effective in restoration to noisy images.关键词：Order statistics;mathematical morphology;adaptive filtering;Ranked-order morphological filters2437|198|0更新时间：2024-05-08
- 摘要：Many methods on form document image analysis have been proposed, but few have treated the extraction of logical structure. A new method for the logical structure extraction of form document is proposed in this paper. The algorithm of it consists of three phases: global division of the whole document, local logical structure analysis and global re-division of the whole document. This method emphasizes the synthetic analysis of the global and local layout structure of a form document. Compared with other local-layout-structure-analysis methods, it has higher accuracy and can treat with more complex form documents.关键词：Form document image analysis;Logical structure analysis;Layout structure analysis2456|209|0更新时间：2024-05-08
- 摘要：Graphics user Interfaces (GUIs) dominates the human-computer interaction (HCI) for some time, and has made that common people can use computer. However, in order to accommodate a wider range of applications, HCI needs to move toward interfaces that are natural, intuitive, adaptive, and unobtrusive. Perception User Interfaces (PUIs) is to implement this natural interaction and becomes a new focus in HCI. This paper first describes the emerging PUI field and the Vision Base Interface (VBI) which is a most important branch in PUI field. Then it expounds two methods which can realize VBI in real time:head locating which detect the position of head motion, hand tracking which fuse color information and motion information to control virtual object. At last it puts forward that not only visual method needs multi-channel information fusion so as to actualize good PUIs, but also PUIs needs many field (speech, haptic) fusion. Experiments show that Vision-Based PUI (VBPUI) can get better precision and real time utility and is a good method in HCI.关键词：Perception user interface (PUI);Vision based interface (VBI);Color segmentation;Human-computerinteraction (HCI)2615|225|0更新时间：2024-05-08
- 摘要：An autonomous location-tracking ability is a major performance for locating sensor systems to navigate an autonomous mobile robot. This paper presents a vision-based omnidirectional location sensor system we have developed in our lab. It is composed of active landmarks, a vision sensor, an image and data processing device. The whole sensor system can be mounted on a mobile robot. Meanwhile, the relative calculation methods and function software were developed that used to obtain the absolute position and orientation of the sensor system and vehicles in their working places. The experiments showed this system could get its pose online and suitable position accuracy for track guidance of mobile robots as well.关键词：Robot location;Visual-based navigation;Landmarks2296|219|0更新时间：2024-05-08
- 摘要：This paper discusses the method of straight-line extraction, which is one of the open problems in computer vision. Based on the analysis of several multi-scale approaches for edge detection, a new idea which straight lines are considered as a kind of feature structures in scale space is developed. Then straight-line extracting is converted into the procedure of analyzing the features in scale space. After the characteristics of the line structures in scale space are analyzed, a robust approach for straight-line extraction is presented. Experimental results on a synthetic image and several natural scene images indict new algorithm's effectiveness.关键词：Early visual processing;scale space;Straight-Line extraction2429|210|0更新时间：2024-05-08
- 摘要：In this paper, a new method for construction of second generation wavelet transform(SGWT) was introduced in briefly. The characteristics of SGWT are as follows: It still has the multiresolution nature as first generation wavelet, the construction is independent on Fourier transform, the coefficients after transform are integer, the performance of reconstruction of image is not influenced by the boundary conditions. Then, the second generation wavelet transform was applied to image lossless coding, according to the characteristic of integer transform of SGWT. SGWT can provide higher compression ratio than Huffman coding while it reconstruct image without lossing compared with first generation wavelet transform. The experiment results show the SGWT has exihibited excellent performance in medical image compression coding.关键词：Second generation wavelet transform;Image compression;Lossless coding2545|219|0更新时间：2024-05-08
- 摘要：In this paper, a new kind of design method of frame-buffer architecture used for real-time three-dimensional image system is presented.On the basis of decomposition of image store algorithm in which the concurrency is embedded, a pipeline multiple SIMD parallel three-dimensional image processing architecture is proposed. The proposed architecture permits parallel access to frame-buffer pixel rectangle, the rectangle can be a row, a column or an array, and also can avoid the distortion of image processed by several elements.关键词：Three-dimensional;Frame-buffer;parallel;Image processing;SIMD2564|182|0更新时间：2024-05-08
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