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检索条件"任意字段=Conference on Visual Communications and Image Processing 2002"

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Color image watermarking based on DCT-domains of color channels

Color image watermarking based on DCT-domains of color chann...

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IEEE Region 10 Technical conference on Computers, communications, Control and Power Engineering

作者： Zheng, RB Zhang, YN Feng, DG Zhao, RC Northwestern Polytech Univ Dept Comp Sci & Engn Xian 710072 Peoples R China

ISBN: (纸本)0780374908

Digital watermarking has been proposed as a method for discouraging illicit copying and distribution of copyrighted material. Now, there are many watermarking schemes for still color images, we present an approach for embedding digital watermarking information into color channels DCT (Discrete cosine transforms) domains of the image. We observe that the correlation value between the color channels DCT coefficients is satisfied with-some kind of statistical regular, by,means of this statistical regular, we can modify. the selected sets of DCT coefficients to make the correlation values Show specific distribution, so that we can embed a binary string into the image. Specifically, the embedded watermarking is extracted without resorting to original image and any other data sets. Experimental results demonstrate that the watermark is robust to most of the image and signal processing techniques, and also our schemes are shown to provide very good results both in terms of image transparency and robustness.

关键词： copyright protection digital watermarking DCT color image

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Iterative source-channel decoding for robust image transmission

Iterative source-channel decoding for robust image transmiss...

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IEEE International conference on Acoustics, Speech, and Signal processing

作者： Kliewer, J Görtz, N Univ Kiel Inst Circuits & Syst Theory D-24143 Kiel Germany

ISBN: (纸本)0780374029

In this paper we discuss the application of a joint source-channel decoding approach to image transmission over wireless channels. In addition to channel codes, also the implicit residual redundancy after source encoding in both horizontal and vertical direction is utilized for error protection. At the decoder we use an iterative ("turbo") source-channel decoder which can be obtained in the same manner as for serially concatenated channel codes. As a new result we show that this iterative decoding scheme in combination with a novel simplified joint source and channel coding rate allocation at the encoder can be successfully employed for protecting the image data, especially when the channel is highly corrupted. Furthermore, when the source correlations are approximated with a large training set at the decoder, only a small loss in performance is observed.

关键词： combined source-channel coding iterative decoding visual communication mobile radio correlation methods redundancy error correction codes turbo codes image coding robust image transmission channel coding rate allocation highly corrupted channel source correlation approximation large training set performance wireless channels implicit residual redundancy error protection horizontal direction vertical direction turbo source-channel decoder iterative decoding joint source-channel decoding

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A functional model of a form pathway from V1 to V4 in visual cortex 9

A functional model of a form pathway from V1 to V4 in visual...

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9th International conference on Neural Information processing

作者： Hashimoto, N Hoshino, O Kashimori, Y Kambara, T Univ Electrocommun Dept Informat Network Grad Sch Informat Syst Chofu Tokyo 1828585 Japan

ISBN: (纸本)9810475241

We present a functional model of V4 area in visual cortex based on predictive coding scheme, in which the prediction is compared with three kinds of images corresponding to three kinds of image representations which are projected through the filters with three different sizes of spatial resolutions. The prediction is represented as a combination of elemental figures. These representations are generated by the response property of main neurons in VI and V4 areas that the main neurons respond selectively to a limited band of frequencies of spatial brightness distribution. We propose the functional role of elemental figures in invariant perception of object form in visual cortex.

关键词： image coding

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A New Texture Spectrum Descriptor and its Application in image Semantic Classification 17

A New Texture Spectrum Descriptor and its Application in Ima...

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17th International conference on Computers and Their Applications, CATA 2002

作者： Wan, Hualin Chowdhury, Morshed U. Hu, Hong Shi, Zhongzhi Lab of Intelligent Information Processing Institute of Computing Technology CAS China School of Computing and Mathematics Deakin University- Melbourne Campus 221 Burwood Highway BurwoodVIC3125 Australia

ISBN: (纸本)9781618395481

There exists an enormous gap between low-level visual features and high-level semantic information and accuracy of content-based image classification. Retrieval depends largely on the description of low-level visual features. Taking these points into consideration, we propose a new method to describe image texture features. Furthermore, incorporating colour and the texture feature spectrum, images are grouped into semantic classes using SVM. Experiment results show our texture spectrum method is more discriminal. © 17th International conference on Computers and Their Applications 2002, CATA 2002. All rights reserved.

关键词： Textures

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Quality improvement and copyright protection for digital cultural content 14

Quality improvement and copyright protection for digital cul...

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14th International conference on Digital Signal processing, DSP 2002

作者： Cappellini, V. Department of Electronics and Telecommunications University of Florence Florence50139 Italy

ISBN: (纸本)0780375033

The application of information technology in the field of Cultural Heritage content, is now widely diffused, and many different aspects are subject to a deep investigation. Among these this paper will in particular analyse the activities carried on during the last years at the image processing and communications Laboratory (Laboratorio Comunicaizionied Immagini - LCI) of the Department of Electronics and Telecommunications of the University of Florence with reference to fine arts images quality improvement and copiright protection. An overview of the European level activities carried out by the Lab will finally be given. © 2002 IEEE.

关键词： image enhancement

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Sub-picture video coding for unequal error protection 11

Sub-picture video coding for unequal error protection

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11th European Signal processing conference, EUSIPCO 2002

作者： Hannuksela, Miska M. Wang, Ye-Kui Gabbouj, Moncef Nokia Mobile Phones Tampere Finland Tampere Finland Tampere University of Technology Finland

Unequal error protection is one of the key tools in video communication systems operating over error-prone networks. In order to allow unequal protection of a video bit-stream, codewords have to be categorized according to their importance to visual quality. The proposed sub-picture coding method allows partitioning images to regions of interest and helps to maintain a good image quality in the chosen regions. As an example, the sub-picture coding scheme is applied to multicast Internet streaming. It is shown that the overall subjective image quality and the objective foreground image quality are considerably better when compared to the selected conventional coding schemes. © 2002 EUSIPCO.

关键词： image quality

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Geometric surface smoothing via anisotropic diffusion of normals

Geometric surface smoothing via anisotropic diffusion of nor...

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IEEE visualization 2002 conference

作者： Tasdizen, T Whitaker, R Burchard, P Osher, S Univ Utah Sch Comp Salt Lake City UT 84112 USA

ISBN: (纸本)0780374983

This paper introduces a method for smoothing complex, noisy surfaces, while preserving (and enhancing) sharp, geometric features. It has two main advantages over previous approaches to feature preserving surface smoothing. First is the use of level set surface models, which allows us to process very complex shapes of arbitrary and changing topology. This generality makes it well suited for processing surfaces that are derived directly from measured data. The second advantage is that the proposed method derives from a well-founded formulation, which is a natural generalization of anisotropic diffusion, as used in image processing. This formulation is based on the proposition that the generalization of image filtering entails filtering the normals of the surface, rather than processing the positions of points on a mesh.

关键词： anisotropic diffusion surface fairing geometric surface processing intrinsic Laplacian of curvature level sets

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visual quality improvement of image subband coder with dithering

Visual quality improvement of image subband coder with dithe...

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2002 IEEE Region 10 conference on Computers, communications, Control and Power Engineering

作者： Ashourian, Mohsen Ho, Yo-Sung Visual Communication Lab Kwangju Adv. Inst. of Sci./Technol. Kwangju Korea Republic of

This paper investigates effect of dithering in improving the visual quality of an image subband coder. A subband coder with scalar quantization of lowest frequency subband and pyramid vector quantization of high frequency subbands was simulated, For subband quantizer both types of subtractive and non-subtractive dither were examined, and the coder performance was compared with the non-modified coder by subjective and objective tests. In a series of pair comparison subjective tests, coder with subtractive dither gained a total average score of 0.32 (in the scaled range of [-1,1 ]), and the coder with non-subtractive dither gained an average score of 0.24 compared to non-dithered coder. As an objective measure the correlation between reconstruction error and original image was calculated, which shows that dithering will result an average of 10 percent reduction in case of non-subtractive dither and 12 percent reduction for subtractive dither.

关键词： image coding

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A human-perception-like image recognition system based on PAP vector representation with multi resolution concept

A human-perception-like image recognition system based on PA...

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IEEE International conference on Acoustics, Speech, and Signal processing

作者： Yagi, M Shibata, T Univ Tokyo Sch Engn Dept Elect Engn Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)0780374029

A human-like robust image recognition system inspired by a psychological brain model [1] has been developed aiming at direct implementation in the VLSI hardware. The Principal Axis Projection (PAP) technique [2] has been employed for feature vector generation, which very well represents the human-perception of similarity in images while substantially reducing the dimensionality. In this study, we have introduced the concept of multi resolution and PAP kernel scanning in the PAP based vector matching algorithm As a result, very robust image recognition has been demonstrated in gray scale images as well as in binary images. Interestingly, a large digit pattern formed as an aggregation of miniature digits like that shown in Fig. I can also be successfully recognized not only in the constituent small digits but also in the entire feature. Although the present algorithm is computationally very expensive, it has been designed fully compatible to execution on VLSI chips which we have developed for vector matching [3-5] and PAP vector generation.

关键词： visual perception brain models image representation edge detection vectors image resolution VLSI feature extraction image matching human perception image recognition system PAP vector representation multi resolution principal axis projection feature vector generation image similarity dimensionality reduction kernel scanning vector matching algorithm gray scale images binary images large digit pattern psychological brain model VLSI hardware

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On adaptive non-linearity for color discrimination and chromatic adaptation

On adaptive non-linearity for color discrimination and chrom...

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1st European conference on Colour in Graphics, Imaging and Vision (CGIV 2002)

作者： Alleysson, D Süsstrunk, S Swiss Fed Inst Technol Audiovisual Commun Lab LCAV EPFL Lausanne Switzerland

ISBN: (纸本)0892082399

Assuming that the photoreceptor response of the human visual system is adaptive and non-linear, we can derive mathematical properties that can account for both color discrimination and chromatic adaptation. This could be due to the photoreceptors' response to illumination, which is non-linear and varies according to the adaptation state. Assuming the Naka-Rushton non-linear function and an automatic gain control function, we can derive color discrimination and chromatic adaptation data. We extend the discussion to a three-layer model of retinal color processing, and show how we could predict corresponding color data.

关键词： Color image processing

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