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Multirate predictor control scheme for visual servo control

IEE PROCEEDINGS-CONTROL THEORY AND APPLICATIONS 2002年第2期149卷 117-124页

作者： Sim, TP Hong, GS Lim, KB Natl Univ Singapore Dept Mech Engn Singapore 119260 Singapore

An attractive control scheme for a position-based dynamic "look and move" eye-in-hand visual servo system is proposed, The multirate predictor control scheme is used to overcome the inherent delay in the vision system and the multirate nature of the dynamic look-and-move visual servo control scheme. The control scheme takes the form of a simple predictor placed in the major feedback of the standard Smith predictor control scheme. This in turn eliminates the delay time between the dynamics of the observed target and the control, in a similar fashion to the feedforward Smith predictor. Hence the proposed control scheme is also known as the modified Smith predictor (MSP) control scheme. A detailed analysis of the proposed control scheme is presented for visual servo control. Representative computer simulation studies are presented to verify the effectiveness of the proposed multirate predictor control scheme for dynamic visual tracking.

关键词： Pattern recognition and computer vision equipment vision system delay predictive control delays servomechanisms feedback Distributed parameter control systems visual servo control target-control delay time modified Smith predictor control scheme computer vision and image processing techniques Optimal control active vision digital simulation Actuating and final control devices Control system design and analysis Control system analysis and synthesis methods computer simulation multi-rate predictor control scheme position-based dynamic look-and-move eye-in-hand system optical tracking control system analysis computing dynamic visual tracking

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Shape-sequence-based key image generation algorithm for browsing and retrieval of video clips

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ELECTRONICS LETTERS 2002年第12期38卷 549-550页

作者： Lee, S Choi, YS Lim, W Kwon, TK Kim, HK Korea Telecom Multimedia Tech Lab Secho Gu Seoul 137792 South Korea Sejong Univ Dept Software Engn Kwangjin Gu Seoul 143747 South Korea

A new shape-sequence-based algorithm that can effectively generate key images from video clips is introduced. Generated key images can be used as the feature information in the browsing and retrieval of video clips from a multimedia database. Experiments with MPEG-7 data sets were performed, and the results are compared with existing methods.

关键词： Information retrieval techniques video clip browsing shape-based image composition technique continuous video frames shape variation multimedia database retrieval image recognition shape-sequence-based algorithm content-based retrieval computer vision and image processing techniques video databases key image generation algorithm video clip retrieval image and video coding image retrieval Spatial and pictorial databases Video signal processing video coding image sequences image recognition shape information

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Hausdorff distance for robust and adaptive template selection in visual target detection

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ELECTRONICS LETTERS 2002年第25期38卷 1651-1653页

作者： Gastaldo, P Zunino, R Univ Genoa DIBE I-16145 Genoa Italy

Template selection is often crucial for target-detection methods;the Hausdorff distance enhances template matching by implicitly encoding the notion of resemblance. In addition, Hausdorff metrics can build up a decision map to solve the template-sizing and selection problems adaptively. The low computational cost of the method fits video-surveillance applications.

关键词： resemblance encoding video-surveillance applications template-sizing television applications low computational cost Hausdorff metrics image matching data compression Hausdorff distance robust template selection image coding visual target detection Applications of television systems computer vision and image processing techniques adaptive signal processing surveillance template matching image and video coding adaptive template selection decision map

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Median M-type K-nearest neighbour (MM-KNN) filter to remove impulse noise from corrupted images

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ELECTRONICS LETTERS 2002年第15期38卷 786-787页

作者： Gallegos-Funes, FJ Ponomaryov, VI Sadovnychiy, S Nino-De-Rivera, L Natl Polytech Inst Mexico Mech & Elect Engn Higher Sch Mexico City 04430 DF Mexico Inst Mexicano Petr Mexico City 07730 DF Mexico

The median M-type K-nearest neighbour (MM-KNN) filter to remove impulse noise from corrupted images is presented. This filter uses R and M estimators combined with different influence functions. Simulation results hav... 详细信息

关键词： median M-type K-nearest neighbour filter Optical, image and video signal processing restoration performance filtering theory Filtering methods in signal processing image restoration median filters impulse noise simulation results nonlinear filters corrupted images influence functions computer vision and image processing techniques impulse noise removal

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Distortionless data hiding based on integer wavelet transform

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ELECTRONICS LETTERS 2002年第25期38卷 1646-1648页

作者： Xuan, GR Zhu, J Chen, JD Shi, YQ Ni, ZC Su, W Tongji Univ Dept Comp Sci Shanghai Peoples R China New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA

A novel distortionless image data hiding algorithm based on integer wavelet transform that can invert the stego-image into the original image without any distortion after the hidden data are extracted is proposed. This algorithm hides data into one (or more) middle bit-plane(s) of the integer wavelet transform coefficients in the middle and high frequency subbands. It can embed much more data compared with the existing distortionless data hiding techniques and satisfy the imperceptibility requirement. The image histogram modification is used to prevent greyscales from possible overflowing. Experimental results have demonstrated the validity of the algorithm.

关键词： wavelet transforms transform coding image and video coding Integral transforms in numerical analysis stego-image inversion integer wavelet transform image coding feature extraction data encapsulation distortionless image data hiding algorithm image histogram modification integer wavelet transform coefficients high frequency subbands middle frequency subbands Data security computer vision and image processing techniques invertible data hiding

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Corner detection by means of contour local vectors

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ELECTRONICS LETTERS 2002年第14期38卷 699-701页

作者： Reche, P Urdiales, C Bandera, A Trazegnies, C Sandoval, F Univ Malaga Dept Technol Elect ETSI Telecomun E-29071 Malaga Spain

A corner detection algorithm for planar shapes based on a new curvature index is proposed. The calculation parameters of this new index are adapted to the shape curvature at each point of its contour. The process consists of estimating the maximum length of contour yielding no significant discontinuities on the right and left sides of each contour point in order to calculate the contour curvature index at that point. Thus, the curvature index is adaptively filtered depending on the natural scale of the contour pixels. Corners are detected by simply thresholding the curve. The proposed method provides a more precise characterisation of the contour. Detected corners are very stable against noise distortion, scaling or rotation.

关键词： thresholding Filtering methods in signal processing adaptive filtering adaptive filters curvature index natural scale images contour pixels edge detection planar shapes shape curvature contour local vectors image recognition corner detection parameter estimation discontinuities maximum length computer vision and image processing techniques

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Developing a raster detector system with the J array processing language

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COMPUTING & CONTROL ENGINEERING JOURNAL 2002年第6期13卷 299-304页

作者： Jacobs, J Oce Technol BV NL-5900 MA Venlo Netherlands

All digital copying aims to reproduce an original image as faithfully as possible under certain constraints. In the past, image processing had to be implemented in hardware for performance reasons. Here, a 100% software solution is outlined. In order to find such a solution an appropriate methodology based on the array processing language J is used. Although J is ideal for prototyping such designs, its wider application is seriously hindered by the lack of awareness of array processing languages amongst engineers, and by the lack of available education in this language and methodology.

关键词： image processing raster detector system reproduction (copying) Publishing and reproduction digital copying J array processing language computer vision and image processing techniques

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Oblivious robust watermarking method by image pre-processing

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ELECTRONICS LETTERS 2002年第14期38卷 702-704页

作者： Agung, IW Sweeney, P Univ Surrey CCSR Guildford GU2 7XH Surrey England

A method of image watermarking which requires no original image for detection is introduced. The proposed scheme pre-processes the original image and embeds the watermark in some parts of the transform coefficients. I... 详细信息

关键词： message authentication watermark embedding Integral transforms in numerical analysis image and video coding copy protection oblivious watermarking method image coding digital watermark transform coefficients robust watermarking method discrete cosine transforms computer vision and image processing techniques image pre-processing DCT coefficients

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Error concealment technique based on optical flow

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ELECTRONICS LETTERS 2002年第18期38卷 1020-1021页

作者： Suh, JW Ho, YS Kwangju Inst Sci & Technol Dept Informat & Commun Kwangju 500712 South Korea

A new motion vector recovery algorithm based on optical flow is proposed. Optical flow fields are very similar to the true motion and can be used to recover three-dimensional motion information. Experimental results on test video sequences produced a higher peak signal-to-noise ratio value than that of conventional methods based on the block matching algorithm.

关键词： error concealment Interpolation and function approximation (numerical analysis) block matching algorithm digital simulation motion vector recovery algorithm Codes test video sequences computer vision and image processing techniques signal-to-noise MPEG-2 video transmission motion estimation Optical, image and video signal processing iterative methods digital transmission services three-dimensional motion optical flow Video signal processing error correction image sequences

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Zero-crossing rates of wavelet frame representations for texture classification

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ELECTRONICS LETTERS 2002年第22期38卷 1340-1341页

作者： Tabesh, A Univ Arizona Dept Elect & Comp Engn Tucson AZ 85721 USA

The zero-crossing rates (ZCRs) of the wavelet frame representation of texture images are proposed as features for texture classification. Results indicate that ZCR features lower the probability of error (PE) by 40% over energy (EN) and correlation coefficient features. Augmenting ZCR features with EN features improves the PE by 70% over ZCR features alone.

关键词： wavelet transforms image processing Optical, image and video signal processing wavelet frame representation texture images Integral transforms in numerical analysis zero-crossing rates correlation coefficient features ZCR features texture classification energy features probability of error image representation image classification computer vision and image processing techniques image recognition image texture

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