Adaptation of IFS Image Coding with a Distortion-Rate Cost Function.
نویسندگان
چکیده
منابع مشابه
Wavelet Image Coding via Rate - Distortion Optimized
Recent advances in wavelet image coding are due to the development of improved methods for spatially adaptive quantization and entropy coding of wavelet highband coeecients. This paper proposes a backward adaptive approach to achieving this spatial adaptivity. Highband coeecients are modeled as independent gaussian random variables with spatially varying variances. Variances are estimated from ...
متن کاملModified Rate-Distortion Function with Optimal Classification for Wavelet Coding
In this paper, we present a wavelet transform based coding approach by employing modiied rate-distortion function and hybrid optimum classiication. In the proposed approach, each upper band subimage from wavelet decomposition is optimally classiied to achieve the minimum quantization error, according to an eecient prediction model and a modiied rate-distortion function. The performance of the a...
متن کاملImage and Video Coding/Transcoding: A Rate Distortion Approach
Due to the lossy nature of image/video compression and the expensive bandwidth and computation resources in a multimedia system, one of the key design issues for image and video coding/transcoding is to optimize trade-off among distortion, rate, and/or complexity. This thesis studies the application of rate distortion (RD) optimization approaches to image and video coding/transcoding for explor...
متن کاملGeometrical Interpretation of Ifs Based Image Coding
In most classical coding methods, a global optimization is carried out to ensure a given bit-rate or a given quality. In IFS based coding, some heuristic choices are made at each step of the algorithm: No method has, for instance, been proposed to optimize the domain blocks position, or the quantization of the transformations parameters. In this article we rst analyze the limits of the existing...
متن کاملFractal image coding using rate-distortion optimized matching pursuit
Matching pursuit is a general and exible method for solving an optimization problem that is of interest in signal analysis, coding, control theory and statistics. In this paper, principles of rate-distortion optimal coding are used in combination with matching pursuit algorithm to obtain an enhanced fractal image coding method. The advantages of using such a method over traditional fractal imag...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of the Institute of Television Engineers of Japan
سال: 1996
ISSN: 0386-6831,1884-9652
DOI: 10.3169/itej1978.50.1132