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JPEG XR is the latest image compression standard. In this paper, two graph-based soft decision quantization (SDQ) methods are developed to optimize the rate-distortion performance of JPEG XR. The first approach uses a full graph, whose number of states is determined by the block size. The second method employs a fast and adaptive event-based graph, where the number of states depends on the number...
A rate control algorithm is introduced to the JPEG XR still image compression algorithm, thereby allowing the user to compress an image to a target bit-rate. Using ρ-domain analysis, we showed a strong linearity relationship of the rate function R(ρ). This allows us to accurately estimate the rate-distortion function, and thus control bit-rate of the JPEG XR encoder.
A low complexity M-channel multiple description coding scheme is developed in this paper, in which each description carries one subset of the input with a higher bit rate and the rest with a lower bit rate. The lower-rate codings in different descriptions are designed to be mutually refinable using staggered scalar quantizers. For correlated sources, a two-rate predictive coding is used in each description...
This paper presents a new low complexity multiple description coding (MDC) method that can generate any number of descriptions. For correlated sources, a special DPCM encoder is used in each description, such that it carries higher rate information of a subset of the samples and lower rate information of the rest. The lower rate codings in different descriptions are designed to be mutually refinable...
A two-stage multiple description predictive coding technique is proposed. A predictive encoder is used in the first stage of each description. The two encoders are designed to create staggered quantizers for the input, which allow further refinement of the joint reconstruction in the second stage. Theoretical analysis and simulation results show that this method is very efficient in the high rate...
A low complexity multiple description (MD) coding method is proposed to generate M descriptions. Consider the MD coding of a stationary correlated source. We first fictitiously partition the source into sample blocks of size M, i.e., M polyphases. Each description encodes all input samples, but with a variable bit rate that depends on the indices of the sample and the description. A special DPCM encoder...
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