Results 151 to 160 of about 901 (179)
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Multilayered Contourlet Based Image Compression
2006After studying contourlet transform and multilayered image representation, we present a Multilayered Contourlet Based Image Compression algorithm (MCBIC) in this paper. It decomposes image into a superposition of coherent layers: piecewise smooth regions layer, directional information layer, e.g., textures and edges.
Fang Liu, Yanli Liu
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The Nonsubsampled Contourlet Transform: Theory, Design, and Applications
IEEE Transactions on Image Processing, 2006In this paper, we develop the nonsubsampled contourlet transform (NSCT) and study its applications. The construction proposed in this paper is based on a nonsubsampled pyramid structure and nonsubsampled directional filter banks. The result is a flexible multiscale, multidirection, and shift-invariant image decomposition that can be efficiently ...
Arthur L. da Cunha +2 more
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Fuzzy Wavelet and Contourlet Based Contrast Enhancement
2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006This paper presents a fuzzy approach for contrast enhancement, based on two multi-scale transforms, namely wavelet and contourlet transforms. Separability and nondirectionality of conventional 2D wavelet transform, makes it unsuitable for sparsely representation of curve or line shaped image objects. On the other hand, the contourlet transform isa good
Ehsan Nezhadarya +2 more
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Vehicle Recognition Using Contourlet Transform and SVM
Fifth International Conference on Information Technology: New Generations (itng 2008), 2008This paper proposes the performance of a new algorithm for vehicles recognition system. This recognition system is based on extracted features on the performance of image's Contourlet transform & achieving standard deviation of Contourlet coefficients matrix in different subbands & various directions.
Saeid Rahati +3 more
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A Novel Blind Watermarking Algorithm in Contourlet Domain
18th International Conference on Pattern Recognition (ICPR'06), 2006A novel watermarking algorithm based on Contourlet transform is proposed in this paper. The watermark composed of pseudo-random sequence is embedded in the selected Contourlet transform coefficients by means of multiplicative method. The Contourlet coefficients are modeled with Generalized Gaussian Distribution with zero mean, and then watermark ...
Haifeng Li, Jianting Wen, Haifeng Gong
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Shearlet and contourlet transforms for analysis of electrocardiogram signals
Computer Methods and Programs in Biomedicine, 2018Cardiac arrhythmia is an abnormal variation in the heart electrical activity that affects millions of people worldwide. Electrocardiogram (ECG) signals have been widely used to assess and diagnose cardiac abnormalities.A novel methodology based on shearlet and contourlet transforms for automatically classify an input ECG signal into different heart ...
Paulo H. J. Amorim +4 more
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CPCO: Contourlet Based PCO Quantification System
2009 International Conference of Soft Computing and Pattern Recognition, 2009Nowadays, Posterior Capsule Opacification (PCO)is a common postoperative complication of cataract surgery. The rate of incidence and the intensity of PCO are affected by factors such as type and shape of implanted intraocular lens(IOL), cataract surgical techniques and etc.
Muhammad Reza Pourshahabi +4 more
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Image coding with iterated contourlet and wavelet transforms
2004 International Conference on Image Processing, 2004. ICIP '04., 2005This paper presents a new coding technique based on a mixed contourlet and wavelet transform. The redundancy of the transform is controlled by using the contourlet at fine scales and by switching to a separable wavelet transform at coarse scales. The transform is then optimized through an iterative projection process in the transform domain in order to
Vivien Chappelier +2 more
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High-resolution image via Multiselective Contourlets
2012 International Conference on Multimedia Computing and Systems, 2012This paper develops an interpolation algorithm for generating a high-resolution image from a low-resolution input image. The idea is to use a simple wavelet-based linear interpolation scheme as our initial high-resolution image; and an iterative projection process based on hard-thresholding scheme in a new Multiselective Contourlets domain, to improve ...
Mohamed El Aallaoui, Abdelwahad Gourch
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WDFB Contourlet and Shearing Invariant for Image Denoising
Third International Conference on Information Technology and Applications (ICITA'05), 2005We have proposed a new implementation of contourlet, namely, WDFB contourlet which is very efficient for image denoising. We also find two reliable methods for norm estimation, i.e. Monte-Carlo estimation and polyphase impulse reconstruction. The former is fast, simple yet reliable, while the latter can exactly reconstruct the contourlet basis, thus ...
Peng Zhang, Lin Ni
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