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Colour image edge detector based on quaternion convolution

ELECTRONICS LETTERS 1998年第10期34卷 969-971页

作者： Sangwine, SJ Univ Reading Dept Engn Reading RG6 6AY Berks England

A new type of edge-detecting filter is presented, based on a new type of image convolution in which colour images are convolved with a pair of quaternion-valued (hypercomplex) masks. When applied to a colour image, the new filter converts areas of smoothly-varying colour to shades of grey;and generates colours in regions where colour (but not intensity) edges occur in the image. The result may be easily thresholded for chromaticity to produce an edge image exhibiting colour only where the original image exhibited a sharp change of colour.

关键词： filtering theory Integral transforms hypercomplex masks image colour analysis image convolution convolution edge detection colour image edge detector Pattern recognition edge-detecting filter Optical information, image and video signal processing Fourier transforms colour quaternion convolution edge image computer vision and image processing techniques chromaticity

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Fast motion detection in compressed domain for video surveillance

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ELECTRONICS LETTERS 2002年第9期38卷 409-411页

作者： Pons, J Prades-Nebot, J Albiol, A Molina, J Univ Politecn Valencia Dept Informat Sistemas & Comp Valencia 46022 Spain Univ Politecn Valencia Dept Commun Valencia 46022 Spain

A fast algorithm to detect motion in the compressed domain for video surveillance is presented. The algorithm partially decompresses the video bit stream and performs motion detection from its quantised discrete cosine transform coefficients, Its very low computational cost makes this algorithm very useful when real-time motion detection has to be performed simultaneously in several video bit streams.

关键词： quantised discrete cosine transform coefficients Integral transforms in numerical analysis quantisation (signal) video surveillance real-time motion detection data compression fast motion detection motion detection computational cost computer vision and image processing techniques surveillance motion estimation image and video coding video bit stream partially video bit stream decompression Video signal processing compressed domain discrete cosine transforms video coding image sequences image recognition

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Improved embedded zerotree wavelet coder

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ELECTRONICS LETTERS 1999年第9期35卷 705-706页

作者： Kang, ES Tanaka, T Ko, SJ Korea Univ Dept Elect Engn Seoul 136701 South Korea Tokyo Inst Technol Grad Sch Sci & Engn Dept Elect & Elect Engn Tokyo 1528552 Japan

An improved embedded zerotree wavelet (IEZW) is presented, which can significantly reduce the scanning and symbol redundancy of the existing EZW.

关键词： wavelet transforms image and video coding Integral transforms in numerical analysis bit allocation scheme image coding symbol redundancy reduction redundancy scanning reduction computer vision and image processing techniques embedded zerotree wavelet coder

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Modifications on morphology-based image coding

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ELECTRONICS LETTERS 2001年第7期37卷 421-422页

作者： Cai, ZH Subramanian, KR Cheng, TH Nanyang Technol Univ Sch EEE Singapore 639798 Singapore

An extension uf morphology-based image coding is presented. Tv achieve better coding efficiency neighbour coefficients are included into the significance m;ip predictor and different subband quantisers are employed to achieve the optimal quantiser fur each subband in a rare-distortion sense, Experimental results show. that about 0.4-0.7dB peak signal-to-noise ratio pain can be obtained.

关键词： coding efficiency rate-distortion sense image and video coding peak signal-to-noise ratio gain significance map predictor image coding optimal quantiser morphology-based image coding quantisation (signal) subband quantisers image morphing neighbour coefficients computer vision and image processing techniques mathematical morphology

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Adaptive image normalisation based on block processing for enhancement of fingerprint image

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ELECTRONICS LETTERS 2002年第14期38卷 696-698页

作者： Kim, BG Park, DJ Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Yusong Gu Taejon 305701 South Korea

Improved algorithms for enhancement of fingerprint images, which have the adaptive normalisation based on block processing, in the automatic fingerprint verification system, are proposed. To obtain an enhanced fingerprint image, first an input image is partitioned into sub-blocks with the size of K x L and the region of interest of the fingerprint image is acquired. The parameters for the image normalisation are then adaptively determined according to the statistics of each block. Utilising these parameters, the block image is normalised for the next process. The proposed algorithms are tested with the NIST fingerprint images and verified to have superb performance.

关键词： input image computer vision and image processing techniques block image block processing sub-blocks enhancement fingerprint identification adaptive image normalisation automatic fingerprint verification adaptive signal processing image enhancement image recognition fingerprint image region of interest

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Reference block updating when tracking with block matching algorithm

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ELECTRONICS LETTERS 2000年第4期36卷 309-310页

作者： Peacock, AM Matsunaga, S Renshaw, D Hannah, J Murray, A Univ Edinburgh Dept Elect Engn Edinburgh EH9 3JL Midlothian Scotland

An important problem when using the block matching algorithm to track objects is how to update the reference block to take account of the changing target appearance. A variety of update strategies are reported and com... 详细信息

关键词： Optical, image and video signal processing motion estimation reference block updating optical tracking update strategies target appearance block matching algorithm image matching computer vision and image processing techniques

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Tracking non-rigid objects in clutter background with geometric active contours

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ELECTRONICS LETTERS 2002年第12期38卷 550-551页

作者： Cen, F Qi, F Shanghai Jiao Tong Univ Dept Comp Sci & Engn Shanghai 200030 Peoples R China

A new variational framework of geometric active contours to track multiple non-rigid moving objects in the clutter background is presented. Incorporating motion edge information, it consists of motion detection and tr... 详细信息

关键词： Optical, image and video signal processing motion estimation variational framework geometric active contours boundary-based object tracking nonrigid objects tracking computer vision multiple nonrigid moving objects motion detection clutter clutter background motion edge information force field regularisation tracking computer vision and image processing techniques

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Feature-bit-plane matching technique for estimation of motion vectors

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ELECTRONICS LETTERS 1998年第11期34卷 1090-1091页

作者： Zhang, JJ Ahmad, MO Swamy, MNS Concordia Univ Dept Elect & Comp Engn Ctr Commun & Signal Proc Montreal PQ H3G 1M8 Canada

The authors describe a fast block matching algorithm based on a feature-bit-plane matching scheme in which two types of transformed planes characterising the spatial distribution of pixel intensities of a frame are employed. Simulation results show that this method provides a prediction accuracy similar to that of the full-search method, while requiring only similar to 10% of the computation needed by the latter.

关键词： motion estimation fast block matching algorithm motion vectors estimation feature-bit-plane matching technique Computational complexity Optical information, image and video signal processing Pattern recognition computer vision and image processing techniques image matching computational complexity

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Data scheduling scheme for power reduction in DWT-based image coders

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ELECTRONICS LETTERS 2002年第9期38卷 408-409页

作者： Seth, K Srinivasan, S Indian Inst Technol Dept Elect Engn Madras 600036 Tamil Nadu India

A new memory data scheduling scheme is used for designing a two-dimensional discrete wavelet transform (2D-DWT) core for ASIC implementation. This scheme reduces by 20 to 30% the overall switching activity in the 2D-DWT core and hence leads to lower power consumption at the expense of a slight reduction in the quality of reconstructed images and a slight increase in the chip area. This scheme is particularly useful in applications such as wireless Internet and laptop computers, in which picture quality can be traded-off for reduced power consumption.

关键词： processor scheduling DWT-based image coders 2D discrete wavelet transform core Integral transforms in numerical analysis 2D-DWT core mobile radio chip area data scheduling scheme application specific integrated circuits image processing equipment reconstructed image quality Internet power reduction Multiprocessing systems wireless Internet applications Semiconductor integrated circuits memory data scheduling scheme image coding laptop computers power consumption ASIC implementation Pattern recognition and computer vision equipment computer vision and image processing techniques image reconstruction discrete wavelet transforms picture quality overall switching activity image and video coding image recognition Signal processing and conditioning equipment and techniques

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Modified embedded zerotree wavelet algorithm for fast implementation of wavelet image codec

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ELECTRONICS LETTERS 2000年第20期36卷 1713-1714页

作者： Patel, S Srinivasan, S Indian Inst Technol Dept Elect Engn Madras 600036 Tamil Nadu India

Embedded zerotree wavelet (EZW) coding, proposed by Shapiro, is one of the commonly used algorithms for wavelet image coding. The speeds of coding and decoding are important issues in the implementation of an image codec. The algorithm proposed by Shapiro requires large execution times due to the numerous comparisons involved. This algorithm is modified to improve the speeds of the encoder and the decoder without otherwise affecting the performance. The modification results in faster software implementation and much faster implementation on a hardware-like platform (tested here using a DSP).

关键词： wavelet transforms hardware-like platform image and video coding Integral transforms in numerical analysis image coding execution times codecs decoding speed EZW wavelet image codec coding speed modified embedded zerotree wavelet algorithm computer vision and image processing techniques Codecs, coders and decoders

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