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

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Estimating blockness distortion for performance evaluation of picture coding algorithms

Estimating blockness distortion for performance evaluation o...

引用

IEEE Pacific Rim conference on communications, Computers and Signal processing

作者： D.D. Giusto M. Perra Department of Electrical and Computer Engineering University of Cagliari Cagliari Italy

Some of the most significant image quality indexes are reviewed and compared with a new method for blockness distortion evaluation. The paper begins with a brief survey on classical measures based on numerical difference between the original and reconstructed image data (e.g., MSE, SNR and PSNR) and advanced methods aiming at considering the perceptive aspects of image degradation (e.g., Hosaka (1986) plots and other methods based on human visual system properties like information content or perceptual image distortion). After, four innovative methods for blockness distortion measurement are proposed: two based on DCT analysis, and two on differential Sobel operator. Results on standard pictures confirm the efficiency of the proposed measures.

关键词： Distortion measurement Nonlinear distortion PSNR Humans Discrete cosine transforms Signal to noise ratio image reconstruction Degradation visual system Pixel

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Perceptually based subband AMBTC image coder

Perceptually based subband AMBTC image coder

引用

International conference on Information, communications and Signal processing

作者： Kai-Kuang Ma Lei Huang School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0780336763

In this paper, we incorporate the Weber's law into the framework of subband absolute moment block truncation coding (SAMBTC) together with an effective bit-rate control scheme to greatly improve image quality at or around the same bit rates. Or, alternatively it reduces the bit rates further without incurring more noticeable degradation beyond what the SAMBTC has yielded. Experimental results show that the proposed perceptually based SAMBTC distinctly outperforms SAMBTC coded at very low bit rates.

关键词： Bit rate image coding Humans Artificial intelligence image quality Surveillance Biomedical imaging visual system Algorithm design and analysis Compression algorithms

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Low frequency coefficient prediction for image coding

Low frequency coefficient prediction for image coding

引用

International conference on Information, communications and Signal processing

作者： W.K. Cham M.C.A. Yeung Department of Electronic Engineering Chinese University of Hong Kong New Territories Hong Kong China

It has been shown that about 80% of the DC coefficients of a transformed image can be discarded at the encoder and then restored at the decoder using a DC coefficient restoration (DCCR) algorithm. This approach can improve the compression rate of JPEG by over 10% at low bit rates. We extend the DCCR algorithm not only to restore the DC coefficients but also to predict some of the (0, 1)th and (1, 0)th AC coefficients. The prediction thus allows these AC coefficients to be represented using less bits. Experimental results show that, almost in all cases, images coded using the proposed algorithm have higher PSNR and better visual quality than those coded using only the DCCR.

关键词： Frequency image coding image restoration Transform coding Decoding Radio spectrum management Gold Bit rate PSNR Quantization

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image compression for facial photographs based on wavelet transform

Image compression for facial photographs based on wavelet tr...

引用

IEEE Pacific Rim conference on communications, Computers and Signal processing

作者： E. Barzykina P. Nasiopoulos R.K. Ward Department of Electrical Engineering University of British Columbia Vancouver BC Canada

This paper presents a wavelet based image compression algorithm specifically tailored for facial photographs. The proposed method dramatically reduces memory requirements for facial image databases. The algorithm makes it possible to reach compression rates of 0.25 to 0.1 bpp without compromising the visual quality of the facial features used for identification purposes. This is made possible by utilizing a novel strategy for quantizing the wavelet coefficients, where the spatial content and the frequency distribution of each input image are combined to produce a quantization scheme which is spatially and frequency dependent and different for each image being processed. The main steps of the algorithm are as follows: detection of more and less important spacial areas in the photograph; discrete wavelet transform; space and frequency dependent quantization customized for a specific frequency distribution of each image; and entropy encoding.

关键词： image coding Quantization Frequency dependence Discrete wavelet transforms Head Facial features Wavelet coefficients Wavelet transforms Colored noise image edge detection

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Corrosion inspection of steel tube inner wall

Corrosion inspection of steel tube inner wall

引用

IEEE/ASME (AIM) International conference on Advanced Intelligent Mechatronics

作者： T. Tsushima A. Ishii Y. Ochi N. Masaoka N. Matsusue Tomoe Corporation Chuo Tokyo Japan University of Electro-Communications Chofu Tokyo Japan

Summary form only given. In order to maintain the safety of steel tubes which have been used as structural members in large scale structures for a long period, the inner wall of their tubes must be investigated periodically. There are several inspection methods including visual inspection which use an industrial endoscope, and visual inspection is practical to use. However, the methods often involve investigation of a lot of video tapes recorded in the field. The aim of the present study is to automate this visual inspection. We have paid attention to the color of the rust which appears in the corroded wall, and have tried to detect corroded regions by using color image processing. Moreover, we have developed a method to be able to inspect the observing video tape in real time by using a commercial high speed image processing board.

关键词： Corrosion Inspection Steel Color Safety Large-scale systems Endoscopes Pixel image processing Displays

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Architecture and design of a high definition television production switcher 139

Architecture and design of a high definition television prod...

引用

139th SMPTE Technical conference and Exhibit

作者： Hobson, Edward Takamori, T. Broadcast and Professional Group Sony ElectronicsVince Harradine Broadcast and Professional RD Department Sony Broadcast and Professional Europe United States Image and Sound Communications Company Sony Corporation Atsugi Japan

ISBN: (纸本)9781614829287

In late 1996, the Federal communications Commission ruled the United States would migrate to a digital television broadcasting system. The Commission chose the Grand Alliance transmission scheme and left the picture scanning format to the marketplace. High Definition video, at 1920 times 1080 pixels, interlaced scanning, at a nominal 60 Hertz field rate is one format in the infamous Table 3 of the ATSC document and FCC ruling. This picture format is also well on the way to becoming a universal format. - A new series of digital systems, conforming to the interlaced scanning format of SMPTE 274M- 1995 were recently introduced by Sony. This paper deals with the architecture, enabling technologies, and capabilities of a live and post production vision mixer from this family of equipment. - A modern, digital, high definition vision mixer, and associated digital effects and editing equipment, must provide producers, directors, and the artistic and technical staff employing them with similar capabilities as existing standard definition equipment - the visual effects expected by a sophisticated audience. These requirements are detailed in this paper and the vision mixer described is compared to similar standard definition devices. - The capabilities of the switcher resulted in an architecture for crosspoints, mix effects systems, key and video processing, control and external interfaces. Operational and maintenance aspects are also key factors in an architecture and include considerations for size, mass, power consumption and heat loads. Picture size and shape may change but control room and remote broadcast vehicle designs dictate limitations on these specifications. Trade-offs in capability and architecture are enumerated. - The data rates employed in HDTV (more than 5 times the rate of SMPTE 125M and SMPTE 259M) required additional new technologies, including the development of a series of Application Specific Integrated Circuits which perform the same functions employed

关键词： Mixers (machinery)

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Compression of bank cheque images based on layout knowledge

Compression of bank cheque images based on layout knowledge

引用

International conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： A.L. Koerich Luan Ling Lee Communications Department School of Electrical and Computer Engineering State University of Campinas Sao Paulo Brazil

In this paper a scheme for bank cheque images compression based on layout knowledge is proposed. The layout structure of the cheques is analyzed and the nonessential parts are located. These parts, viz., the background and the printed information, are eliminated from the original image. The resulting image contains some noise that are eliminated by a filtering operation. The image is enclosed to eliminate some uninformative parts. The final image has only the filled information. The digitized image can be easily reconstructed by restoring the filled information and summing it with background and printed information. The proposed compression scheme is tested by Brazilian bank cheques. Comparisons with other compression schemes, shows that the proposed scheme performs significantly better in terms of the compression efficiency, maintaining the visual quality.

关键词： image coding image reconstruction Knowledge engineering image restoration Testing Credit cards Law Legal factors Information retrieval image color analysis

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Defect detection by recursive filters in packaging industry

Defect detection by recursive filters in packaging industry

引用

International conference on Information, communications and Signal processing

作者： J. Caron L. Duvieubourg Laboratoire d'Analyse des Systhmes du Littoral Calais France Centre d'Automatique de Lille Universiti des Sciences et Technologies de Lille Villeneuve d'Ascq France

This paper addresses the task of automating the visual inspection of a strip of plastic by a vision system based on a line scan camera. The defects on the strip are characterized by a local variation in the reflectance properties of the surface to be inspected. There are efficient methods, even with variations in illumination, to highlight the defects. Usually these methods used high-pass filters, to enhance the edges of the defects. In the presence of noise the performance of these filters tends to decrease. Also, before the use of a high-pass filter it is necessary to apply a low-pass filter to smooth the noise in the line image. But in the case of poor contrast defects these methods are inefficient. We propose to take advantage of a new filter which has been developed in our laboratory and which optimizes the edge detection of the defect in any case. The performance of this new filter are demonstrated with real images and with different kind of defects.

关键词： Packaging Low pass filters Strips image edge detection Inspection Plastics Machine vision Cameras Reflectivity Lighting

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Architecture and Design of a High Definition Television Production Switcher

Architecture and Design of a High Definition Television Prod...

引用

SMPTE Technical conference

作者： Edward Hobson T. Takamori Broadcast and Professional Group Sony Electronics Vince Harradine Broadcast and Professional R&D Department Sony Broadcast and Professional Europe Image and Sound Communications Company Sony Corporation Atsugi Japan

In late 1996, the Federal communications Commission ruled the United States would migrate to a digital television broadcasting system. The Commission chose the Grand Alliance transmission scheme and left the picture scanning format to the marketplace. High Definition video, at 1920 times 1080 pixels, interlaced scanning, at a nominal 60 Hertz field rate is one format in the infamous Table 3 of the ATSC document and FCC ruling. This picture format is also well on the way to becoming a universal format. — A new series of digital systems, conforming to the interlaced scanning format of SMPTE 274M- 1995 were recently introduced by Sony. This paper deals with the architecture, enabling technologies, and capabilities of a live and post production vision mixer from this family of equipment. — A modern, digital, high definition vision mixer, and associated digital effects and editing equipment, must provide producers, directors, and the artistic and technical staff employing them with similar capabilities as existing standard definition equipment—the visual effects expected by a sophisticated audience. These requirements are detailed in this paper and the vision mixer described is compared to similar standard definition devices. — The capabilities of the switcher resulted in an architecture for crosspoints, mix effects systems, key and video processing, control and external interfaces. Operational and maintenance aspects are also key factors in an architecture and include considerations for size, mass, power consumption and heat loads. Picture size and shape may change but control room and remote broadcast vehicle designs dictate limitations on these specifications. Trade-offs in capability and architecture are enumerated. — The data rates employed in HDTV (more than 5 times the rate of SMPTE 125M and SMPTE 259M) required additional new technologies, including the development of a series of Application Specific Integrated Circuits which perform the same functions employed i

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Speech-assisted lip synchronization in audio-visual communications

Speech-assisted lip synchronization in audio-visual communic...

引用

Proceedings of the 1995 IEEE International conference on image processing. Part 3 (of 3)

作者： Chen, Tsuhan Graf, Hans Peter Haskell, Barry Petajan, Eric Wang, Yao Chen, Homer Chou, Wu AT&T Bell Lab Holmdel United States

We utilize speech information to improve the quality of audio-visual communications such as video telephony and videoconferencing. We show that the marriage of speech analysis and image processing can solve problems related to lip synchronization. We present a technique called speech-assisted frame-rate conversion, and apply it to coding of talking head video. Demonstration sequences are presented. Extensions and other applications are outlined.

关键词： image processing

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