Embedded multiple description scalar quantizers for progressive image transmission
نویسندگان
چکیده
Equation Section 1 Robust progressive image transmission over unreliable channels with variable bandwidth requires Multiple Description Coding (MDC) systems that produce highly error-resilient embedded bitstreams. The proposed Embedded Multiple Description Scalar Quantizers (EMDSQ) meet the desired features consisting of a high redundancy level, fine grain rate adaptation and progressive transmission of each description. Experimental results show that EMDSQ yield better rate-distortion performance in comparison to the Multiple Description Uniform Scalar Quantizers (MDUSQ) previously proposed in the literature. Moreover, the generalized form of EMDSQ targeting an arbitrary number of channels is proposed, which offers the possibility of designing realistic coders for practical multi-channel communication systems.
منابع مشابه
Embedded Multiple Description Scalar Quantizers
A new class of Embedded Multiple Description Scalar Quantizers (EMDSQ) is proposed. EMDSQ meet the desired features of high redundancy level, fine grain rate adaptation and progressive transmission of each description. Experimental results show that EMDSQ yield better rate-distortion performance in comparison to Multiple Description Uniform Scalar Quantizers (MDUSQ) previously proposed in the l...
متن کاملEmbedded multiple description coding for progressive image transmission over unreliable channels
A multiple description scalar quantization (MDSQ) based coding system can be regarded as a source coder (quantizer) followed by a channel coder, i.e. the combination of index and codeword assignment. The redundancy, or the correlation between the descriptions, is controlled by the number of diagonals covered by the index assignment. We consider here the usage of multiple description uniform sca...
متن کاملDesign of successively refinable trellis-coded quantizers
We propose successively refinable trellis-coded quantizers for progressive transmission. (Progressive transmission is an essential component of image and multimedia browsing systems.) A new trellis structure which is scalable is used in the design of our trellis-coded quantizers. A hierarchical set partitioning is developed to preserve successive refinability. Two algorithms for designing trell...
متن کاملCodecell Contiguity in Optimal Fixed-Rate and Entropy-Constrained Network Scalar Quantizers
We consider the properties of optimal xed-rate and entropy-constrained scalar quantizers for nite alphabet sources. In particular, w econsider conditions under which the optimal scalar quantizer with contiguous codecells achieves performance no worse than the optimal scalar quantizer without the constraint of codecell contiguit y.In addition to traditional scalar quantizers, w econsider multi-r...
متن کاملMultistage index assignments for M-description coding
We consider the problem of generalized multiple description coding of image data, in which an image is encoded into M descriptions sent over M unreliable channels, and any description subset is useful in reconstructing an approximation of the original image. In a two-description scalar quantizer, a quantizer index is simply mapped by an injective mapping, defined by an assignment matrix, on a p...
متن کامل