Linear/nonlinear adaptive polyphase subband decomposition structures for image compression
نویسندگان
چکیده
Subband decomposition techniques have been extensively used for data coding and analysis. In most filter banks, the goal is to obtain subsampled signals corresponding to different spectral regions of the original data. However, this approach leads to various artifacts in images having spatially varying characteristics, such as images containing text, subtitles, or sharp edges. In this paper, adaptive filter banks with perfect reconstruction property are presented for such images. The filters of the decomposition structure which can be either linear or nonlinear vary according to the nature of the signal. This leads to improved image compression ratios. Simulation examples are presented.
منابع مشابه
Adaptive Polyphase Subband Decomposition Structures for Image Compression
Subband decomposition techniques have been extensively used for data coding and analysis. In most lter banks, the goal is to obtain subsampled signals corresponding to di erent spectral bands of the original data. However, this approach leads to various artifacts in images containing text, subtitles, or sharp edges. In this paper, adaptive lter banks with perfect reconstruction property are pre...
متن کاملNew Subband Adaptive IIR Filter Based On Polyphase Decomposition
Abstract—We present a subband adaptive infinite-impulse response (IIR) filtering method, which is based on a polyphase decomposition of IIR filter. Motivated by the fact that the polyphase structure has benefits in terms of convergence rate and stability, we introduce the polyphase decomposition to subband IIR filtering, i.e., in each subband high order IIR filter is decomposed into polyphase I...
متن کاملICCAS2005 June 2-5, KINTEX, Gyeonggi-Do, Korea Polyphase Representation of the Relationships Among Fullband, Subband, and Block Adaptive Filters
In hands-free telephone systems, the received speech signal is fed back to the microphone and constitutes the so-called echo. To cancel the effect of this time-varying echo path, it is necessary to device an adaptive filter between the receiving and the transmitting ends. For a typical FIR realization, the length of the fullband adaptive filter results in high computational complexity and low c...
متن کاملCellular Neural Networks for Image Compression by Adaptive Morphological Subband Coding
An “analogic” algorithm is developed for the Cellular Neural Network Universal Machine, that realizes Adaptive Subband Decomposition, a recently proposed algorithm for image compression. In this way, it is possible to obtain very high compression rates with optimized perceptual performance, using real-time mixed analog/digital programmable processors.
متن کاملStatistically Adaptive Wavelet Image Coding
In the mid-1980's, wavelet theory was developed in applied mathematics [1, 2, 3]. Soon, subband coding [4], which has been a very active research area for image and video compression, was identi ed as wavelet's discrete cousin. Furthermore, a fundamental insight into the structure of subband lters was developed from wavelet theory that led to a more productive approach to designing the lters [1...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
دوره 9 10 شماره
صفحات -
تاریخ انتشار 1998