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检索条件"任意字段=Visual Communications and Image Processing II 1987"

共 186 条记录，以下是31-40 订阅

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image coding for Chinese character patterns

Image coding for Chinese character patterns

引用

visual communications and image processing ii 1987

作者： Liu, Tsann-Shyong Jeng, Bor-Shenn Chang, Gan-How Ju, Rong-Hauh Telecommunication Laboratories Ministry Of Communications P. O. Box 71 Chung-Li Taiwan

Some noiseless data compression methods are introduced in this paper. By using these methods, we compress Chinese character patterns to save storage space. Since quality is very important for Chinese Character patterns, the patterns have to return to their original forms after decoding. Before coding, we first process the patterns by memorizing the changing points, rearranging pattern pixels and prediction function to improve the probability of some specific source symbols in analysis. After the preprocessing stated above, we use mn subblock or run-length as the source symbol in Huffman coding and compare the results for each method. Our highest compression rate is 70%. © 1987 SPIE. All rights reserved.

关键词： image coding

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A general, iterative method of image recovery

A general, iterative method of image recovery

引用

visual communications and image processing ii 1987

作者： Mammone, R.J. Podilchuk, C.I. Rutgers The State University Department of Electrical and Computer Engineering P. O. Box 909 PiscatawayNJ08854 United States

A general iterative method of restoring linearly degraded images has been introduced recently [J. Opt. Soc. Amer., 4, 208-215 (1987)3. In this paper, the general method is reformulated into a more tractable fixed point iterative procedure. The new formulation is shown to be an implementation of the steepest descent algorithm. The inherent step size of the generalized method is found to be responsible for its slow convergence. A new method is presented whose increased step size offers accelerated convergence. The realization of the new accelerated method is shown to require only a minor modification of the original algorithm. A new stopping criterion is also introduced. Computer simulations demonstrate a significant improvement in the rate of convergence of the new method. © 1987 SPIE. All rights reserved.

关键词： Iterative methods

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image sequence compression with a subjective criterion 2

Image sequence compression with a subjective criterion

引用

visual communications and image processing ii 1987

作者： Lee, Choon Nadler, Morton Department of Electrical Engineering Virginia Polytechnic Institute State University BlacksburgVA24061 United States

In the previous paper, the techniques of dual-mode coding were introduced. One of the techniques uses the two-dimensional delta modulation to code the image pixels. In this scheme, the predictor is switched Letween the Graham's predictor and the normal predictor which sends the direction bits. The bit rate is the lowest of the considered systems. In this paper, the channel coding of the system is considered. Especially in coding the difference bits, several methods were studied including the ordering of the bits according to the two-dimensional statistics of the difference bit map. The window for the predictor of the difference bits was designed to maximize the coding efficiency. For a variety of images tested in this paper, the bit rates for the difference bits were in the range 0.6717-0.8774 bits/pixel which are about 11 to 28 percent less than those of the one-dimensional run-length coded bits. © 1987 SPIE. All rights reserved.

关键词： Codes (symbols)

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A modified Given's algorithm and VLSI architecture for solving linear system equations

A modified Given's algorithm and VLSI architecture for solvi...

引用

visual communications and image processing ii 1987

作者： Jou, I-Chang Tseng, Chih-Yuan Telecommunication Labs. Ministry of Communications P.O. Box 71 Chung-Li Taiwan Institute of Information and Elec National Central University Chung-Li Taiwan

This paper describes a modified Given's rotation algorithm and pipelined architecture for solving linear system equations A x = b. We have shown that this algorithm can be implemented with a trapezoidal type array with 0(n2/2) processors, and a linear array with O(n) processors. The computing time for solving linear system equations will be 0(5n) time units. The numerical stability of this algorithm is superior than that of conventional hyperbolic algorithm. Since the array processors are very simple and regular, so the architecture of linear system solver is much suitable for the VLSI implementation. © 1987 SPIE. All rights reserved.

关键词： Linear systems

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A VLSI architecture for a nonlinear edge-preserving noise-smoothing image filter

A VLSI architecture for a nonlinear edge-preserving noise-sm...

引用

visual communications and image processing ii 1987

作者： Papananos, Yannis Anastassiou, Dimitris Dept of Electrical Engineering Computer Science Division National Technical University of Athens Greece Department of Electrical Engineering Center for Telecommunications Research Columbia University New YorkNY United States

A nonlinear, nonrecursive, two-dimensional filter has been developed for edge-preserving noise smoothing of images. It can also be beneficial as a pre-processor for data compression purposes. The filter is applied over a 3x3 window of pixels and uses an adaptive threshold. As with all image filters, the computational requirements lead to the utilization of special purpose VLSI hardware for real time implementation. The algorithm is being implemented in VLSI using a systolic array structure and parallel architecture, in which each processing element is assigned to one pixel. The structure of the processing element is very simple: except for some control gates and registers, it contains only a one-bit full adder as the main functional element. The most important feature of the proposed architecture is that the nonlinear operation has been implemented using no more than the simple tools and the silicon area required for a linear convolutional algorithm. Other properties of the above design are: simple interconnection scheme between processing elements and common control circuitry for all the processing elements on a single chip. Due to the topological simplicity of the processing element, arrays of size 16×16 cells per chip are believed to be feasible, using standard CMOS technology. © 1987 SPIE. All rights reserved.

关键词： Pixels

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Towards Universal GAN image Detection

Towards Universal GAN Image Detection

引用

IEEE International Conference on visual communications and image processing (VCIP) - visual communications in the Era of AI and Limited Resources

作者： Cozzolino, Davide Gragnaniello, Diego Poggi, Giovanni Verdoliva, Luisa Univ Federico II Naples Naples Italy

ISBN: (纸本)9781728185514

The ever higher quality and wide diffusion of fake images have spawn a quest for reliable forensic tools. Many GAN image detectors have been proposed, recently. In real world scenarios, however, most of them show limited robustness and generalization ability. Moreover, they often rely on side information not available at test time, that is, they are not universal. We investigate these problems and propose a new GAN image detector based on a limited sub-sampling architecture and a suitable contrastive learning paradigm. Experiments carried out in challenging conditions prove the proposed method to be a first step towards universal GAN image detection, ensuring also good robustness to common image impairments, and good generalization to unseen architectures.

关键词： Fake detection

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A simplified scheme of analytic video predictors

A simplified scheme of analytic video predictors

引用

visual communications and image processing ii 1987

作者： Chen, T.C. Bell Communications Research Red BankNJ07701-7020 United States

A simplified adaptive linear predictive coding scheme is proposed in this paper for video applications. The leastabsolute-value (L1) and the least-squares (L2) criteria are considered. The scheme uses a vector formulation similar to DPCM techniques in video coding to simplify the prediction coefficient calculation from 2-D to 1-D. Higherorder prediction is further simplied using a lattice structure, which can be viewed as a concatenation of identical firstorder structures. The computation complexity of highorder prediction coefficients is thus decomposed into simple successive first-order calculation. The lattice structure also allows the stability constraints to be easily imposed, which is not the case in a general 2-D transversal formulation. The prediction error of the proposed scheme is a decreasing function of the prediction order, which shows the gain of this analytic approach over fixed predictor DPCM. The L1 scheme is more robust in the presence of noise while the L2 scheme is easier to solve computationally. Simulation results show clearly the advantages of the proposed scheme. © 1987 SPIE. All rights reserved.

关键词： Forecasting

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Intra-frame image coding by adaptive vector quantization with variable block sizes

Intra-frame image coding by adaptive vector quantization wit...

引用

visual communications and image processing ii 1987

作者： Sun, H. Manikopoulos, C.N. Department of Electrical Engineering Fairleigh Dickinson University New Jersey07666 United States

Vector quantization is a new coding technique which has enjoyed much success in its brief history. Its most attractive features are a high compression ratio and a simple decoder. Thus, it shows great promise in applications using a single-encoder with a multiple decoder such as videotext and archiving. However, some problems have arisen, most notably edge degradation, the so-called "block effect". A novel method is described in this paper which alleviated this problem without much increase in computational effort. A index has been devised, the activity index, based upon measurements on the input image data;it is used to classify image areas into two groups, active and nonactive. For nonactive areas, large block size is used, while for active areas the block size is small. Two codebooks are generated corresponding to each of the two groups of blocks formed. Using this adaptive vector quantization scheme the results obtained show that the edge features are well preserved upon reconstruction at the decoder. © 1987 SPIE. All rights reserved.

关键词： Vector quantization

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Efficient transmission of "most important" successive image approximations 2

Efficient transmission of "most important" successive image ...

引用

visual communications and image processing ii 1987

作者： Dreizen, Howard M. Department of Electrical and Computer Engineering Illinois Institute of Technology ChicagoIL60616 United States

Swift recognition of grey scale images transmitted through low bandwidth channels has been demonstrated by various progressive techniques in which a series of gradually refined image approximations are received and displayed. A previous technique demonstrated nonhomogeneous progressive transmission in which image content controls transmission priorities, resulting in a decrease of the time required to receive a usable image. The non-homogeneous technique utilized two simultaneous decompositions, a quad-tree based spatial and a subimage information measure. The concept of simultaneous decomposition is extended to include a third component: grey level approximation. Just as an undecomposed quad-subtree provides a spatial approximation, values of pixels used as quad-subtree representatives are initially approximated and later refined. The three simultaneous decompositions are integrated so as to achieve, for a given transmission time, a higher degree of received image usefulness. The receiver does not have a priori knowledge about which image areas are to receive preferential treatment, and the level of preference is the pixel. The total transmission time for the series of approximations concluding in lossless reception, including preferential decomposition overhead, is comparable to the time required by non-progressive lossless methods. The technique is computationally simple and intended for general purpose processor architectures. © 1987 SPIE. All rights reserved.

关键词： Pixels

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Recursive multi-directional image filters 2

Recursive multi-directional image filters

引用

visual communications and image processing ii 1987

作者： Tsai, Tu-Chih Anastassiou, Dimitris Department of Electrical Engineering Center for Telecommunications Research Columbia University New YorkNY United States

Recursive image filters are computationally more efficient than nonrecursive ones. The phase of recursive filters is normally nonlinear, but it can become linear (actually zero) by the use of multidirectional filtering, in which the overall system is a cascade or parallel combination of the same simple recursive filter applied in different directions. The same concept is generalized to include nonlinear recursive multi-directional image filters. Nonlinear recursive filters have not been investigated in the literature due to their analytic difficulty and their lack of general stability criteria. A useful task requiring nonlinear operation is to differentiate the high spatial frequency components of a picture into those due to edges and those due to noise. A linear low-pass filter will simultaneously smooth noise and blur edges. A linear high-pass filter will simultaneously crisp edges and enhance noise. We propose a specific nonlinear multi-directional recursive scheme for simultaneous edge enhancement and noise smoothing of images. The filter has low complexity and is guaranteed to be stable. It can be used for image enhancement or restoration purposes, or as a preprocessor for spatial coding techniques, in which case the compression ratio can be increased without deterioration of quality by eliminating useless information form the original signal. © 1987 SPIE. All rights reserved.

关键词： Low pass filters

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