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In recent years, surveillance videos are playing an important role in modern security systems. As a state-of-the-art video coding standard, High Efficiency Video Coding (HEVC) has been deployed in many surveillance cameras. Nevertheless, the request of real-time and high subjective quality coding still poses the great challenging problem of efficient representation and compression for high complexity...
While statistical redundancy removal has been extensively studied as a core technology of traditional video encoders, visual attention can be further exploited to improve coding efficiency. In this paper, we present an optimization strategy of video coding based on visual-attention area extraction. The proposed algorithm is a three-step method. First, a visual-attention map is generated with a spatio-temporal...
WiFi access points, mesh routers, wireless sensors and any other wireless routers along the road can serve as roadside unit (RSU), and these RSUs can provide infrastructural supports for wireless access and data dissemination in cyber-transportation systems. We present a hybrid routing scheme in vehicular networks for inter-vehicle, vehicle-to-roadside and inter-roadside data dissemination in urban...
In this paper, we propose a novel complexity-adjustable video coding algorithm for H.264/AVC-based wireless video communications through portable devices. To optimize the rate-distortion performance under power constraint in packet loss environment, we present a novel model that can adapt to the different channel conditions and computation power constraints. The experimental results demonstrate that...
This paper presents an adaptive packetization method, targeting at the video transmission over the wireless networks. Above all, the mean and the variance of overall end-to-end distortion are examined, which show that the error-concealment distortion and its variance are more sensitive to the packetization scheme rather than the overall distortion. Since the previous end-to-end distortion models usually...
In this paper, we propose a fast mode decision scheme for H.264 video coding to address the requirements of both low complexity and error resilience in realtime video communications. Traditional fast mode decision schemes are usually designed based on feature analysis on the source videos. However, the rate-distortion behaviors of the coding modes change when channel errors are involved. Therefore,...
In this paper we propose a novel joint power-rate-distortion (P-R-D) model for H.264/AVC-based wireless video communications through portable devices. To optimize video qualify after transmission through error prone channels under the condition of energy constraints for real-time video coding, we present a novel model that takes into account multiple factors, including energy allocation, source coding,...
Approximation metric is a significant factor for subjective quality improvement of polygonal vertex-based shape codec. Usually this metric is defined by absolute distance measure (ADM). ADM only considers the shortest absolute distance from candidate vertices on the original object contour segment to corresponding approximating line segment and ignores other visual characteristics of the contour segment...
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