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A pixel domain algorithm for low complexity perceptual image coding is proposed. The algorithm exploits a combination of downsampling, predictive coding and just-noticeable difference (JND) model. Downsampling is performed adaptively on the input image based on regions-of-interest (ROI) identified by measuring the downsampling distortions against the visibility thresholds given by the JND model. The...
A Discontinuous transmission (DTX) system, which is widely adopted in speech codecs, is an important function for speech communication systems that can reduce the transmission bandwidth by at least a half. Within a DTX system, the comfort noise generation (CNG) plays a key role in the overall quality. Critical performance parameters with respect to the CNG including the transition quality from active...
Inspired by information processing of complex cells in visual cortex, we present a simple system for fast and robust feature extraction. Our method includes an unsupervised algorithm for learning invariant descriptors from data, and an architecture for the task of digit recognition. The proposed algorithm is not only efficient that training can be accomplished in a few iterations, but can map test...
In this paper, we present a new contour point distortion measurement, called accurate distortion measurement for B-spline-based shape coding (ADMBSC). Different from existing distortion measurements containing approximation, quantization or parameterization, our distortion is defined as the shortest distance from the original B-spline to the associated contour point. This is in line with the subjective-based...
Summary form only given. Existing distortion measurements for the B-spline-based shape coding include ap proximation, quantization, or parameterization process, so they are approximate techniques. They may inaccurately predict the actual distortion value, which motivates us to construct a model that can accurately measure the actual distortion. It was reported that the actual distortion for reconstruction...
Admissible distortion checking algorithm plays a very important role in both rate distortion performance and computational efficiency of B-spline-based operational rate-distortion optimal shape coding framework under the minimum-maximum criterion. Existing distortion measurement using chord-length parameterization (DMCLP) is fast but results in extra bit-rate problem. In contrast, the up to date accurate...
Before vehicle-to-vehicle-communication-based road safety becomes a reality, one of the challenges that needs to be resolved is efficient and timely recovery of safety packets that may be lost due to reception failure. Various types of retransmission-based recovery protocols have been proposed in the literature to address this problem. Although, retransmission can help recover some of the lost packets,...
Joint source channel coding (JSCC) has been proved a promising scheme for image communication in varying channel because of the properties of graceful degradation/improvement with limited coding delay and complexity, especially the combination of wavelet transform and JSCC is an easy way to achieve high-powered channel optimized image coding. For the purpose of attaining better performance, the source...
Analog transmission has the advantage of allowing the quality of recovered data to vary gracefully as the channel conditions vary. For the purpose of robust image communication, two analog error-control coding schemes based on dimension-expanding Shannon mapping are discussed in this paper, including the encoding processes, decoding processes and joint source channel optimizing design methods. In...
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