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基于北斗短报文的图像步进传输技术研究 被引量:4
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作者 周菲 王春梅 +1 位作者 林树青 刘书伟 《通信技术》 2018年第12期2841-2847,共7页
为了实现北斗卫星短报文窄带通信传输图像,综合北斗卫星导航系统、图像压缩、嵌入式系统、地理信息系统等技术,构建了基于北斗短报文的图像步进传输技术。对数字图像压缩中具有代表性的几种图像编码方法进行统计,利用小波变换技术压缩图... 为了实现北斗卫星短报文窄带通信传输图像,综合北斗卫星导航系统、图像压缩、嵌入式系统、地理信息系统等技术,构建了基于北斗短报文的图像步进传输技术。对数字图像压缩中具有代表性的几种图像编码方法进行统计,利用小波变换技术压缩图像,通过量化将强相关的空间像素阵影射为不关联和能量分布紧凑的小波系数阵,其中占少数值大的小波系数代表了图像中最主要的能量成分,并用少量信息描述大系数所代表的主要能量成分,从而达到高的压缩比,实现在窄带条件下步进传输静态图像功能。理论与实践证明,基于北斗短报文的图像步进传输对遥感遥测静态图像传输可靠,具有重要的现实意义和实用价值。 展开更多
关键词 北斗卫星 短本文 图像压缩 DCT 小波变换
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Punctuation as a sociolinguistic variable in text messages
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作者 Nancy Anashia Ong 'onda Peter Maina Matu Omondi Oketch 《Sino-US English Teaching》 2010年第9期42-47,共6页
The development of text messaging in cell phones has influenced punctuation variations in written language. In order to determine how text messaging has resulted in paradigm shift in the traditional uses of punctuatio... The development of text messaging in cell phones has influenced punctuation variations in written language. In order to determine how text messaging has resulted in paradigm shift in the traditional uses of punctuation marks, this paper explores how punctuation marks vary with language, location, register and time, and how they are constantly evolving. The discussion in this paper is structured around Coupland's sociolinguistic theory. The findings reveal that new technology has impacted on the traditional uses of punctuation marks. Thus, the results show that the use of punctuation markers in Short Message Service (SMS) texts is complex. Moreover, the use of punctuation marks in Kenyan text messages reveals personal stylistic choices. However, it is apparent that Kenyan text messages are shaped by social variables. 展开更多
关键词 Short Message Service (SMS) punctuation VARIATION Kenyan
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