共查询到15条相似文献,搜索用时 31 毫秒
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高性能视频编码(High Efficiency Video Coding,HEVC)标准中的帧内编码模式利用当前帧中像素点之间的空间相关性作出有效预测。为了解决待编码像素远离参考像素时预测不准确的问题,提出了一种基于邻近值的HEVC帧内预测优化算法。该算法的主要思想是,对于当前像素,先根据传统HEVC帧内编码方法得到其预测值,再使用该像素点左边、左上、上边位置的修正值以及该像素本身的预测值对该预测值进行修正。因为将当前像素与周围像素的相关性进行了有效的数学建模,所以HEVC帧内编码性能得到了提升。实验结果显示,所提算法与HEVC标准相比,最高节省了2.7%的码率,平均节省的码率为1.3%。 相似文献
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新一代视频编码标准HEVC获得了较高的编码效率,但是同时需要较大的计算量。HEVC并行算法能够提高编码速度,如何开发适用于多核处理器的并行编码算法对于满足高清视频实时传输和大规模共享具有十分重要的意义。提出了一种基于Syntax级分组和多线程处理的HEVC熵编码并行算法。该算法首先将HEVC中一个编码树单元的编码信息按照语法元素进行分组;其次,根据编码块数据间的相关性构建Syntax级并行编码器;然后结合多线程技术实现HEVC帧级编码的并行计算。实验结果表明,在编码图像的主客观质量上没有太大损失的情况下,该并行算法框架与传统的串行算法框架相比具有65%~70%的加速效果。 相似文献
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供需深度融合的农产品供应链模式,有利于促进农产品的有效供给水平,可以更好地满足消费者的需求,同时也能够引导农业生产的发展,从而促进农业经济发展水平。本文通过对农产品供应链模式的调查研究,指出现有的农产品供应链运作模式在产、供、销各环节存在的诸多问题,结合智慧物流的相关技术及手段,完善和优化现有的农产品供应链运作模式,提出面向“大湾区+新通道”广西农产品的供应链模式优化策略,促进广西农产品供应链模式的不断升级,将有利于形成广西农产品“大市场、大流通”格局,同时加快广西农产品物流的发展及乡村振兴的步伐。 相似文献
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为了更好地将人眼视觉感知特性应用于视频压缩系统,从而去除视频的视觉冗余成分,在利用像素域的恰可察失真(Just Noticeable Distortion,JND)阈值的基础上,结合JND阈值的空间相关性与图像块类型,提出了一种改进的残差滤波算法。该算法首先在像素域计算出每个像素的JND阈值,然后在变换单元(Transform Unit,TU)中挖掘每个像素JND阈值与其周围邻近像素JND阈值之间的空间相关性,再利用索贝儿(Sobel)边缘检测算子将TU分成不同类型的图像块,并且计算出对应的复杂度因子,最后结合上述像素JND阈值的空间相关性和TU复杂度因子对TU残差进行滤波。提出的算法模型可以嵌入到高效率视频编码(High Efficiency Video Coding,HEVC)框架。实验结果表明,在全I帧配置下,提出的算法与标准算法HM16.0相比,在人眼主观感知质量基本一致的情况下,平均可节省16.1%的码率。 相似文献
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《Journal of World Business》2018,53(3):323-336
This paper extends international business theory by providing insights into contextual boundaries of the dominant strategic adaptation model, based on assumptions of low power distance and a bottom-up management style. We challenge them by examining the context of Asian organizations with contrasting management style and ask how it is possible for them to adapt. We propose a supplementary “top-down” model of adaptation, supported by empirical data from East Asian organizations. The model involves low autonomy of lower- and middle-level managers, but fluid communication from bottom to top, enabling informed but authoritarian adaptive decision-making exclusively at the behest of top management. 相似文献
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Periods of rapidly rising prices are seen by many as cyclical and pervasive phenomena in modern day economic systems. When rapid price increases occur, they are likely to induce adaptive behavior on the part of consumers. This article reports on a study seeking to analyze consumer inflation-induced adaptive behavior as it relates to three food-related consumer activities–food buying, preparation, and consumption. Results indicate that consumers, in general, attempt to adjust to the changing economic environment in several ways: they exercise more care and planning in food shopping, are more price sensitive and price conscious, are willing to sacrifice convenience but not quality, and try to maintain their usual level of food consumption and food habits. Results also indicate that inflation leads to greater adaptive behavior on the part of lower income consumers. 相似文献
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在经历ROI的追求探寻洗礼后,互联网广告的实施者们不得不适时的推出更适合市场需求的产品。一位资深的网络广告行业分析师表示,精准投放是行业发展的大势所趋,无论是iFocus、窄告、点睛、搜索广告,都力争要求做到更好的精准、匹配投放。 相似文献
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Predicting consumers' responses to inflationary pressures has been a dominant research area in psychology, economics, and marketing. The present study attempts to model consumers' inflation-induced adaptive behavior using demographic, shopping patterns, and attitudes as predictors. Also, the present study is not limited to purchase behaviors. Rather, inflation-induced adaptive behaviors are examined for the purchase, preparation, and consumption of necessity goods (food items) involving a relatively low expenditure per purchase but a relatively high annual expenditure. 相似文献
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