Quadtree-Guided Wavelet Image Coding
نویسندگان
چکیده
A hybrid of wavelet and quadtree image coding is introduced. It uses a recently developed quadtree predictive coding technique, having good rate/fidelity performance and very low complexity, to encode the baseband wavelet coefficients. The resulting quadtree decomposition of the baseband is then used to guide the encoding of higher frequency subbands, by indicating which of their coefficients require encoding and which do not. The result is a coding method with performance comparable to those of the best known wavelet coders, but with less complexity.
منابع مشابه
Wavelet Transform Image Coding Using the Visually Enhanced Quadtree
A novel image coding scheme using wavelet transform is presented. The developed coding scheme prevents undesirable classifications of wavelet coefficients which arise from conventional quadtree based image coding. This is accomplished by pre-processing the wavelet coefficients. This pre-processing is based statistical distributions of the wavelet coefficients in subbands and the human visual sy...
متن کاملEmbedded Image Coding Based on Context Classification and Quadtree Ordering in Wavelet Packet Domain
This paper presents an embedded wavelet packet image coding algorithm which is based on context classification and quadtree ordering (CCAQO). To match up well with the quadtree-based embedded coder, a new cost function for the best basis selection is adopted in discrete wavelet packet transform (DWPT). In addition, combined with the structure of the best wavelet packet basis, a complete quadtre...
متن کاملEmbedded wavelet packet object-based image coding based on context classification and quadtree ordering
In this paper, an object-based embedded image coding algorithm based on context classification and quadtree ordering in wavelet packet domain (OB-CCAQO) is proposed. To match up well with the quadtree-based embedded coder, a new cost function for the best basis selection is adopted in SA-DWPT (shape adaptive discrete wavelet packet transform). The significance probability of wavelet coefficient...
متن کاملA wavelet packet image coding algorithm based on quadtree classification and UTCQ
In this paper, we present a wavelet packet image coding algorithm based on quadtree classification and UTCQ. It is composed of four parts: (1) wavelet packet decomposition and best basis selection based on a new cost function, (2) a quadtree classification procedure, used to classify the wavelet packet coefficients into two sets: a significant one and an insignificant one, (3) the universal tre...
متن کاملProgressive Image Transmission By Linear Quadtree Coding and Wavelet Transformation by
Progressive image transmission allows an approximate image to be built quickly and the details to be transmitted progressively through several stages over the channel. This technique appears very useful for picture communication over slow channels. This thesis proposes to use linear quadtree encoding combined with wavelet based technique as well as other methods to achieve a hybrid coding progr...
متن کامل