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Image Sharpening by DWT-Based Hysteresis
2011Improvement of edge details in an image is basically a process of extracting high frequency details from the image and then adding this information to the blurred image. In this paper we propose an image sharpening technique in which high frequency details are extracted using wavelet transforms and then added with the blurred image to enhance the edge ...
Nuhman ul Haq +3 more
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Watermarking Algorithm based on the DWT
IEEE Latin America Transactions, 2006Watermarking is considered as a desirable alternative for copyright protection of digital materials such as images, video and audio. Two kinds of watermarking algorithms are usually used: the watermarking algorithms using pseudorandom patterns and those using visual recognizable patterns. The main advantage of watermarking algorithms embedding a visual
Victor Hernandez-Guzman +3 more
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Textures classification based on DWT
2018 28th International Conference Radioelektronika (RADIOELEKTRONIKA), 2018Nowadays classification of textures is very actual. Classification means separation of textures into classes. The main task of the classification is to find such a descriptor which is unique for the given class. This article deals with the classification based on energies distributed into DWT subimages.
Ondrej Kovac +2 more
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A Robust Multiple Watermarking Scheme Based on the DWT
10th International Multi-Conferences on Systems, Signals & Devices 2013 (SSD13), 2013In this paper we make contributions to a non-blind multiple watermarking scheme that proceeds by embedding a binary image in the discrete wavelet transform bands of a gray scale image. Unlike the common wavelet based watermarking techniques, the proposed scheme lies essentially on marking the approximation and diagonal bands of the discrete wavelet ...
Ouazzane Hana +2 more
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DWT-based error concealment techniques
Proceedings DCC 2002. Data Compression Conference, 2003Summary form only given. This paper describes an adaptive error recovery technique for a DWT-based coding and transmission system, which recovers singularity information as well as continuity. The approach provided in this paper not only interpolates from the boundary, but also maintains the sharpness in background instead of smoothing the ...
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Design of New Optimized Architecture Processor for DWT
Real-Time Imaging, 2000Summary: This paper presents a VLSI implementation of One Dimensional Direct Discrete Wavelet transform (1-D DWT). The DDWT can be viewed as a multi-resolution decomposition of a signal. This means that it decomposes a signal into its components in different frequency bands (octave bands). We propose a new architecture using parallel filters.
Souani, C. +4 more
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2001
This chapter takes up the design of discrete wavelet transforms based on oversampled filter banks. In this case the wavelets form an overcomplete basis, or frame. In particular, we consider the design of systems that are analogous to Daubechies’ orthonormal wavelets — that is, the design of minimal length wavelet filters satisfying certain polynomial ...
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This chapter takes up the design of discrete wavelet transforms based on oversampled filter banks. In this case the wavelets form an overcomplete basis, or frame. In particular, we consider the design of systems that are analogous to Daubechies’ orthonormal wavelets — that is, the design of minimal length wavelet filters satisfying certain polynomial ...
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A New Watermarking Method Based on DWT
2005A new hiding scheme of digital image is introduced in this paper, which is robust to image processing such as JPEG compression, median filtering, adding Gauss noise, cropping, and histogram equalization. In this paper, we embed watermark into DWT domain, using integer modulo, retrieval of embedded watermark does not need original image.
Xiang-Chu Feng, Yongdong Yang
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A Reconfigurable VLSI Structure for DWT
2009 First International Conference on Information Science and Engineering, 2009DWT has been the main algorithm of image compression, such as in JPEG2000.This paper propose a VLSI structure to perform line-based DWT using lifting scheme. We use this mean to achieve 1D and 2D DWT, examination results show this structure is simple and efficient.
Qi Hong +3 more
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A parallel algorithm for DWT and GFT
Proceedings of TENCON '93. IEEE Region 10 International Conference on Computers, Communications and Automation, 2002Discrete W transform (DWT) proposed by Wang (1985) has been used in digital signal processing and other fields. Its fast algorithm has been studied extensively when the number of points is a power of 2, but we have still known little about its fast algorithm in other cases. In this paper, it is shown that a DWT of length N=N/sub 1/N/sub 2/ (N/sub 1/ is
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