最新刊期
卷 5 ， 期 5 ， 2000
- 摘要：This is the fifth in the survey series of yearly bibliographies on image engineering in China. Considering the current status of the researches on image engineering and the applications of image techniques as well as the distribution of related publications in China, near 400 research and technique references are selected from more than 2000 research papers published in a set of 15 Chinese journals, in which papers concerning image engineering are relatively concentrated. These references are classified into different categories according to their contents. An analysis and a discussion of the statistics made on the classification results are also presented. In addition, a summary about the survey series is also provided to better analyst the development of image engineering in China for the last years of 20 century This work shows a general and up-to-date picture of the progresses of image engineering in China, supplies a convenient means of literature searching for readers doing researches and/or applications in this field, and provides a useful reference for the editors of journals and potential authors of papers.关键词：Image engineering;Image processing;Image analysis;Image understanding;technique application;survey3741|139|0更新时间：2024-05-08
- 摘要：The problem of error resilience in compressed video communication is becoming increasingly important because of the growing interest in video delivery over error-prone channels such as mobile networks and the Internet. One inherent problem of such error-prone channels is channel errors. Current video compression standards achieve efficient compression by using predictive coding and variable length entropy coding. Variable length coding schemes are highly vulnerable to channel errors. Predictive coding make matters much worse since the errors quickly propagate across the entire video sequence. So the effect of these errors not only can cause great degradation of the quality of service, even can lead to the failure of the whole video communication system. Some error resilience technologies have already been included in several video coding international standards such as H.263+, H.263++and MPEG-4. This article gives a detail description of the content and principle of error resilience technologies, such as resynchronization, data partitioning, reversible variable length coding, reference picture selection mode and error concealment, etc, which are used in diversified new video coding international standards. This article also gives some simulation results of error resilience technologies based on IMT-2000 channel models. The result shows error resilience technologies can remarkably improve the subjective and objective quality of the reconstructed image.关键词：video coding;Error resilience;Data partitioning;Reversible variable length coding;Errorconcealment3251|140|0更新时间：2024-05-08
- 摘要：In order to construct three dimension model of architectural solid, a new solution method for geometrical model based on single-vision of hybrid modeling system has been developed. In this method, edge profiles were pickup from image first. Space parameter equations of 3D solid was constructed by adding additional restriction condition. By solving the equations, space coordination and others parameter of 3D solid was obtained. At last, visual reality was achieved by introducing texture pickup and transition technique. Experiments has proved that the method has high modeling efficiency and wide practicability. It can be used for modeling of most关键词：Hybrid modeling;Computer visualization;Solution method for model;Visual reality2733|128|0更新时间：2024-05-08
- 摘要：Halftone is first used in color printing systems. The two main methods used in halftone of color printing systems are amplitude modulation and frequency modulation. But because the difference in techniques, we cannot use the methods in color printing directly into the system of textile printing. With the development of CAD/CAM and modern textile techniques, more and more researches focus on the design and manufacture of gradient patterns in textile printing. Based on the algorithm in color printing systems, a novel algorithm for halftone used in textile printing is presented. It can satisfy the techniques of textile printing. At the same time it overcomes the disadvantage of the old halftone algorithms and will not produce moirépatterns again. At the end of the paper, some improvements on the algorithm are also mentioned so that it can be more suitable for the idiographic techniques in textile printing. The algorithm it has been realized under Windows 98 and has been used in the textile oriented CAD/CAM system (Top98) in real factories.关键词：halftone;Moirépatterns2979|140|0更新时间：2024-05-08
- 摘要：A novel approach for adaptive threshold selection from gray level histogram using index of fuzziness is presented. The principle of threshold selection through minimizing index of fuzziness is described first, and then how to choose the membership function and window size is illustrated. Based on the object-background-contrast computed from the distance between the object and the camera, a new method for the automatic choice of window size of a predetermined membership function is provided. Also an algorithm to obtain object-background-contrast from the distance between the naval vessel and the camera is suggested. The experiment is conducted over three images of a target warship with different distance between the object and the camera and with different contrast. The results show that the approach proposed herein has better performance on adapting the scenario variance.关键词：Image processing;Image segmentation;fuzzy sets;threshold selection;adaptive2815|148|0更新时间：2024-05-08
- 摘要：This paper presents a method for 3D surface adaptive reconstruction based on a deformable model, which integrates a deformable model and ACD(Affine Cell Decomposition)method. An external force is developed from the statistical characteristics of image that drives the model towards surface of object with complex geometries and topologies. ACD method is used to adapt topologies of model by reparameterizing the deformable model. In order to improve the speed and robust of 3D surface reconstruction, the mul-scale surface reconstruction algorithm is proposed. Results of several experiments show the potential of the method for reconstruction some objects with complicated shape and topologies.关键词：3D Surface adaptive reconstruction;deformable model;Affine Cell Decompoition;Multi-scale surfacereconstruction algorithm3927|173|0更新时间：2024-05-08
- 摘要：In this paper, a new algorithm for unsupervised Clustering analysis is proposed, through a new kind of iterative activation the examples of a cluster are moved inside to the center of the gravity of the cluster together. Through this method correct number of clusters could be got. Because each sample moves only in its own cluster while iterating, we can correctly tell which cluster a sample should belong to. The experiments show that the new algorithm has better results in several aspects than HCM and FCM algorithms, such as unsupervised clustering, correct clustering, clustering capability for special data which HCM and FCM algorithms can not cluster. The new algorithm is an unsupervised clustering algorithm but HCM and FCM algorithms need correct number of clusters before iterative activation.关键词：HCM;FCM;unsupervised clustering;Iterative activation2055|233|0更新时间：2024-05-08
- 摘要：The most important information for image identification is edges of objects. But when objects are seated among nature background, those edges of nature background will be a great burden to the identification process. So unnecessary edges must be removed before identification. In tradition, a method called“huerestic threshold”is used to reach that target. But it performs bad in preserving details of objects, because local information is not taken into account. According to fractal geometry, it is found that the fractal density of edges of men-made objects is close to 1, while that of nature background is close to 0 or 2. Thus a novel method is proposed to fulfill the demand. This method integrates the consideration of both gradient strength of edge points and fractal density of curves, and uses cluster analysis for filter. In this paper, images of planes with cloud and forest as background are used to testify the effectiveness of the new method. From the experiment, it can be seen that most background edges are filtered, yet details of planes are preserved. so the method is beyond the function of the traditional method. At the end of this paper, the limit of this method is discussed.关键词：fractal dimension;Fractal density;Edge detecting;clustering2296|196|0更新时间：2024-05-08
- 摘要：In this paper, a kind of practical image segmentation algorithm for segmenting the license plate from its vehicle body background is presented, based on wavelet multiscale analysis and mathematical morphology. By multi-resolution analysis and pyramid decomposition, the edge components with different spatial resolutions and different directions can be acquired, among which, the horizontal low-frequency and vertical high-frequency component has the most distinguished texture feature standing for the object region of the license plate. Then by further morphological operations, the noise in these edge components can be greatly decreased and the locations of the license plates can be also accurately determined. We have completed a series of experiments under different conditions. The experiment results show that the segmentation effects and it' s orientation accuracy are improred significantly, so the proposed method is very effective for segmenting and locating noisy vehicle license plates.关键词：Vehicle-license-plate image segmentation;wavelet;mathematical morphology2910|193|0更新时间：2024-05-08
- 摘要：Brain functional imaging is a kind of important tools in study of brain and life science. It is necessary to register the time series images of brain functional imaging when doing statistical analysis for image data. In this paper, we adopt a modified Gauss-Newton optimization method to find out higher accurate registration of the time series brain functional images by calculating the minimum standard deviation between the registered images.关键词：Brain functional imaging;Images registration;optimization2948|147|0更新时间：2024-05-08
- 摘要：In order to extract medial axes of tree-like objects from three-dimensional images. A medial axis extraction algorithm is presented, it estimates coarse medial axis using centroids and applies multi-scale refinement to its main points, especially at bifurcations. The algorithm has both simplicity (as of centroid algorithms) and accuracy (as of scale space analysis methods) properties, and is suited in blurred and noisy conditions. The algorithm is successfully applied to the visualization of three-dimensional images of human heart that are acquired from medical CT. The method of generating curved section from medial axis and spreading it to screen is also given. Curved sectional display of branched vessels is firstly realized.关键词：Medial axis;Centroid;multiscale;Curved section2383|167|0更新时间：2024-05-08
- 摘要：For almost all kinds of medical images, especially image series generated by CT, MRI and B-Scan, the difficulty consisting in the rendering of three-dimensional (3D) volume data set is actually a key hindrance for 3D Visualization. Aiming at the problem, a lot of models and algorithms have been proposed. In medical imaging, shortly after the publication of“Volume Rendering”written by Dr. Drebin, the algorithm of volume rendering based on classification became very popular. However, the common method can be only a makeshift. 3D visualization, in terms of direct insight into the volume data set, should not be the superstructure of classification, but the basis of it. Summarizing the Source-Attenuation model of volume rendering and Lambert Cosine Law of diffuse reflection, in the paper, a new light model of Source &Reflection-Attenuation for 3D Visualization in Medical Imaging is proposed. This model assumes that each point in the three-dimensional scalar data field is a light source and can also reflect the incident ray, moreover the distributing of reflected light conforms to Lambert Cosine Law of diffuse reflection. The experimental results show that the new model can produce vivid 3D images, when used for 3D visualization in medical imaging.关键词：Three-Dimensional visualization;volume rendering;voxel;Opacity2754|156|0更新时间：2024-05-08
- 摘要：Augmented reality AR is a technology in which a user's view of the real world is enhanced or augmented with additional information generated from a computer model. One of the key issues in the implementation of augmented reality is the registration problem. Synthetically,vision-based registration can offer superior solutions. In several existing registration methods, 2-D objects or pictures are used as positioning fiducials, and at least two cameras and/or separate tracking subsystems are needed. In this paper, a new registration method is proposed which uses a solid fiducial and a single color CCD camera. The new method significantly simplifies the registration system and algorithm, and coordination errors are eliminated. The algorithm requires little computation and can be easily realized in real time without latency.关键词：augmented reality;Registration;Solid fiducial4672|151|0更新时间：2024-05-08
- 摘要：In computer aided 2D cartoon producing systems, the vectorization of scanned pencil drawings can greatly enhance the efficiency of inking and painting, retrieve lines and closures contained in the drawings and therefore lay the basis for implementation of more advanced functions such as autocoloring, inbetweening and so on. Thinning of scanned pencil drawings is the first step of the vectorization process. Having investigated and compared a lot of thinning algorithms, an improved noniterative thinning algorithm based on the idea of line following is presented. The improved algorithm is very efficient, which, requiring only one pass of image scanning and two passes of contour tracing, meets the high efficiency standard in computer aided 2D cartoon producing systems. Time complexity of the algorithm is analyzed in detail, and the method to reduce two kinds of image noises and to delete redundant branches after thinning are given.关键词：vectorization;thinning;Line following;skeleton2459|136|0更新时间：2024-05-08
- 摘要：A computer-automated system for measuring antibiotic potency is introduced in this paper. Based on the gray-level histogram, an adaptive thresholding technique for image segmentation is used in the system. Furthermore, appropriate pre-processing algorithms are adopted to improve the precision of segmentation, and filter rules are proposed to remove fake object. Finally, the antibiotic potency is calculated according to the biological assay theory.关键词：Measuring of antibiotic potency;Tube-dish method;Image segmentation;Thresholding2188|149|0更新时间：2024-05-08
- 摘要：A complicated question which structure analysis in Three-Dimension braided composites is solved By modeling computer graphics, then the composites mechanics performance will be expediently analysed. This paper presents a quantificationally descriptive method of complicated fabric structure in Three-Dimension braided composites for the prevalent braided technology-four-step procedure. By emulating the spatial location of optional yarn as computer Three-Dimension model, the yarn trend in Three-Dimension braided composites is shown conveniently and clearly, and every yarn can be separated and dissected for observing relative position by simply operating the completed model. Some presented conclusions of geometrical description are also validated.关键词：Composites;Computer graphic display;Three-dimensional braided structure2714|137|0更新时间：2024-05-08
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