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A New Region-of-interest Coding Method to Control the Relative Quality of Progressive Decoded Images 总被引:1,自引:0,他引:1
Based on the ideas of controlling relative quality and rearranging bitplanes, a new ROI coding method for JPEG2000 was proposed, which shifts and rearranges bitplanes in units of bitplane groups. It can code arbitrary shaped ROI without shape coding, and reserve almost arbitrary percent of background information. It also can control the relative quality of progressive decoded images. In addition, it is easy to be implemented and has low computational cost. 相似文献
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Routes optimization in urban freight distribution is usually an off-line process based on the knowledge of historical conditions on the network. Real-time data provided by Intelligent Transportation Systems (ITSs) enable online re-optimization on the basis of actual traffic conditions.?This paper evaluates the added value generated by re-optimizing the off-line solution with real-time information. The study is carried out for a practical application to the freight distribution of perishable goods in the city of Rome (Italy). The off-line problem is formulated as a vehicle routing problem with soft time windows while in the online problem it is also allowed to skip some customers or to re-sequence the deliveries. Both versions are solved with different algorithms and with different data sets. Results can be used to evaluate the potential return on investment on the acquisition of different kinds of traffic data. At the same time, results can be of interest for information providers, to fix the price of off-line and online information and/or to estimate the associated potential market share. 相似文献
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程琳琳 《广东交通职业技术学院学报》2011,10(4):32-36
感兴趣区域提取技术在图像分析与处理领域中起着重要的作用。文中对现有的感兴趣区域提取技术进行了深入探讨,详细研究了当前几种较具代表性的感兴趣区域提取技术,并对其提取效果做了评价。总结了它们的优缺点以及适用场景,为用户选取合适的感兴趣区域提取方法,提供了实验依据。 相似文献
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目前常用的钢轨波磨检测方法有弦测法和惯性基准法,弦测法传递函数不恒定,惯性基准法受车速影响大。针对钢轨波磨检测方法的缺点,提出了一种基于激光摄像技术的波磨检测方法,通过多传感器并行工作对钢轨轮廓进行高频率采样,通过FPGA(现场可编程门阵列)对传感器获得的光条图像进行ROI(Region Of Interest)提取,将图像的ROI传送至上位机提取轮廓数据,进而完成钢轨的波磨信息提取。论证了通过多传感器并行工作提高钢轨轮廓的采样频率的可行性,在Xilinx SP605开发板上实现了光条图像ROI的实时提取。试验表明,ROI提取能够有效减小通信的数据量。 相似文献
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雷达图像存储模块是船舶航行数据记录仪(VDR)的关键组成部分之一。此文根据船舶航行特点和船舶避碰原理,研究了基于JPEG2000的雷达图像感兴趣区域(ROI)编码方法,这种方法在保证了图像重点区域无损压缩的基础上,对图像其他区域实行高比例压缩。试验表明:该方法对VDR中雷达图像压缩具有良好的效果。 相似文献
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