Screen image sequence compression method utilizing adaptive block size coding and hierarchical GOP structure

To compress screen image sequence in real-time remote and interactive applications, a novel compression method is proposed. The proposed method is named as CABHG. CABHG employs hybrid coding schemes that consist of intra-frame and inter-frame coding modes. The intra-frame coding is a rate-distortion optimized adaptive block size that can be also used for the compression of a single screen image. The inter-frame coding utilizes hierarchical group of pictures (GOP) structure to improve system performance during random accesses and fast-backward scans. Experimental results demonstrate that the proposed CABHG method has approximately 47%–48% higher compression ratio and 46%–53% lower CPU utilization than professional screen image sequence codecs such as TechSmith Ensharpen codec and Sorenson 3 codec. Compared with general video codecs such as H.264 codec, XviD MPEG-4 codec and Apple’s Animation codec, CABHG also shows 87%–88% higher compression ratio and 64%–81% lower CPU utilization than these general video codecs.     

基于缓存结构的民机实时QAR数据译码方法

新一代通信技术的发展使得QAR数据可在飞行中实时传输;传统译码研究均针对航后QAR数据,难以高效处理实时数据;为提升实时QAR数据的译码效率,提出了基于缓存结构的译码方法,将传统的译码表转换为专门的数据结构,并进行缓存,避免了译码过程中对配置表的全表搜索,提升了译码效率;采用Go语言、Redis缓存、Influxdb2数据库,搭建了实时QAR数据译码平台;采用基于ATG网络的实测QAR数据,对译码平台的性能进行了仿真测试;针对实时QAR数据,平均译码延迟约为5 ms,测试结果表明基于缓存结构的译码方法能够高效处理实时QAR数据。     

试论油气储运管道防腐技术的应用现状

近几年来,石油行业得到了很大的发展和提升,针对于石油的应用,也越来越广泛。而在石油应用愈加增多的情况下,针对油气储运管道的建设越来越多,油气的储运和运输主要依靠于石油储运管道,因此石油储运管道的安全性极其重要。接下来,本文将结合油气储运管道腐蚀的表现,探讨油气储运管道防腐技术的应用现状。     

可调节式多路甲烷测定器检定装置的研制

通过对催化燃烧式甲烷测定器检定原理进行分析,在不改变规程要求检定环境的条件下,对检定装置进行重新设计并制作,通过配合"气体分流箱"的使用,可根据检定数量及所需标准气体浓度要求,实现一个开关可以控制1～8路气路的气体浓度值,简化了操作步骤的同时节省时间且提升了工作效率.