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Totransmitthemultimediadataovertheinternet ,pre encodedvideobitstreamsarepreferablebecauseofthelimitofthenetworkbandwidth .Inmostcases ,theencodershouldknowthechannelcharacteristicsinad vanceandencodethemasparameters .Consequently ,theflexibilityisreduced .Theratecontrolisemployedtocontroltheoutputbitrateaccordingtonetworkcondi tions.Forwirelessnetworks ,theirbandwidthsaremuchmorelimitedthanwirenetworks.Soratecontrolbecomesespeciallyimportantfortransmittingmultimediaoverthewirelessdomains[1- … 相似文献
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李桂苓 《天津市教科院学报》2001,(6):56-57
当代外语教学越来越重视情感因素对教学效果的影响，这就要求外语教师必须在外语教学的同时扮演心理学家的角色，教师必须对学习者的心理有所了解，以自己良好的情感取得学生的信任，并设法满足他们的情感需要，以便激发他们的学习兴趣，从而取得良好的教学效果。 一、了解学生个性心理是实施情感教学的前提条件 根据巴甫洛夫创立的神经类型分类学说，人的神经系统类型主要分为四种：兴奋型、活泼型、安定型和抑制型。兴奋型和活泼型属外向性格，安定型和抑制型属内向性格。外向性格学生在课堂上表现得比较活泼、开朗、热情、爱说，不怕犯错… 相似文献
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Motion estimation is an important part of the MPEG-4 encoder, due to its significant impact on the bit rate and the output quality of the encoder sequence. Unfortunately this feature takes a significant part of the encoding time especially when the straightforward full search(FS) algorithm is used. In this paper, a new algo-rithm named diamond block based gradient descent search (DBBGDS) algorithm, which is significantly faster than FS and gives similar quality of the output sequence, is proposed. At the same time, some other algo-rithms, such as three step search (TSS), improved three step search (ITSS), new three step search (NTSS),four step search (4SS) , cellular search (CS) , diamond search (DS) and block based gradient descent search (BBGDS) , are adopted and compared with DBBGDS. As the experimental results show, DBBGDS has its own advantages. Although DS has been adopted by the MPEG-4 VM, its output sequence quality is worse than that of the proposed algorithm while its complexity is similar to the proposed one. Compared with BBGDS, the proposed algorithm can achieve a better output quality. 相似文献
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