全景图自动生成算法中几个相关问题的研究

本文以未知环境下移动机器人导航技术的研究为背着，研究了移动机器人单目视觉下全景图自动生成的方法。本文设计一种针对彩色图像的柱面全景图自动拼接的新方法，该方法允许图像有一定的倾斜、旋转和变形，允许相邻图像之间有一定的色差。     

仿生复眼测量系统中全景图生成的研究

模仿昆虫复眼结构形状,设计了一种仿生复眼测量系统.该系统由七个CCD摄像机按照复眼最小单元排列组成,利用多个DSP处理板对七路视频信号进行同步处理,模拟实现了复眼的功能.与传统的视觉测量系统相比,该系统具有更宽的视场和更高的运动灵敏度.本文利用改进的相关性方法实现视频图像的拼接,生成全景图,并提出了新的方法,较好地消除了因图像局部不齐和图像灰度不一致带来的人为拼接痕迹.     

一个基于图像的虚拟现实系统

简要介绍了基于图像绘制技术的特点及理论基础,重点阐述基于柱面全景图的方法,并在此基础上实现了一个虚拟现实系统。用这个方法,解决了全景图自动生成工具、场景的实时显示算法及全景图浏览器设计的技术问题。     

酒钢120 t转炉-LF-CC工艺生产L360管线钢的实践

通过铁水脱硫-120t转炉冶炼-LF精炼(吹氩、喂线)-160(220)mm板坯连铸-2架炉卷轧机,轧制生产 了1.6~12.7mm管线钢L360带材(%:0.08～0. 12C 、0.10～0.25Si 、1. 10~1.30Mn 、≤0.015P 、≤0.008S 、0.03~ 0.05Nb)。采用高拉碳补吹法控制转炉终点[C]0.04%;LF精炼时用AlMnFe、MnFe和NbFe合金化,并喂Al线和 SiCaBa线;连铸采用全程氩封注流保护浇铸等工艺措施。生产统计结果表明,L360管线钢[0]为(10~15)×10^-6, [N](14~35)×10^-6,[H](1.2~1.6)×10^-6, Σ [N+H+0]≤51.6×10^-6;该钢的屈服强度为425～460 MPa,抗拉 强度505～525 MPa,屈强比0.81～0.88,均达到标准要求。     

Anupama Kundoo

Informed by research into and experimentation with eco-friendly construction methods, the work of Anupama Kundoo adheres to the fundamentals of Indian tectonics in forming its architectural language. In this respect her work is influenced by the experimental environment of Auroville, and the construction innovations of Balkrishna Doshi and Laurie Baker. In 1990 she started her architecture practice in Auroville, a place she describes as an international city in the making in southeast India (see her essay in this issue). From 1992 to 1996 she lived in Berlin and worked in social housing, before returning to Auroville. Copyright © 2007 John Wiley & Sons, Ltd.     

Fast sample adaptive offset algorithm for 360-degree video coding

360-degree video is becoming popular with the development of the virtual reality(VR) technology in recent years. For this kind of video, pictures are projected to a two-dimensional plane. Standard video encoders are used for compression. Due to the projection mapping of the spherical video to the two-dimensional plane video, many conventional coding tools can be adjusted properly for better performance. As the 360-degree videos are high resolution videos, usually 8K resolution videos, the high complexity for encoding 360-degree videos is a problem to be solved urgently, especially for the latest video standard H.265/HEVC. Sample adaptive offset (SAO) is a new tool adopted in H.265/HEVC. It can reduce ringing artifacts and achieve higher coding efficiency. But it also introduces high computational complexity, especially on high resolution videos. In this paper, a fuzzy control based fast SAO method is proposed to reduce the high computational complexity in SAO encoding process according to the characteristics of the ERP format video. Compared with the original algorithm in the reference software HM 16.14, experimental results show that the proposed method can reduce about 73% SAO encoding time on average under the common test conditions with negligible loss.     

福州市园林绿化竣工测量的实施

利用建设项目规划竣工测量所得数据,提取满足园林绿化系统要求的绿化信息数据,为园林部门进行城市园林绿化管理提供依据;介绍了园林绿化竣工测量包含的各项内容以及360°全景影像在园林绿化竣工测量中的应用;通过软件二次开发,实现规划竣工测量数据的快速利用及作业流程的简化。     

退火温度对NM360耐磨钢堆焊层组织与性能的影响

利用D507MoNb焊条对NM360耐磨钢板进行堆焊修复,并于焊后分别在200,400,600℃进行退火处理,研究了退火温度对堆焊层显微组织、硬度、冲击韧性及耐磨性能的影响。结果表明:堆焊层退火前的组织为马氏体+碳化物,在200,400,600℃退火后,堆焊层的组织分别为回火马氏体、回火屈氏体及回火索氏体;随着退火温度升高,堆焊层的硬度降低,冲击韧性增加,耐磨性下降;200℃退火后的堆焊层具有最佳的耐磨性,其相对耐磨性为母材的1.327倍。     

Effect of frozen storage and protective packaging on lipid oxidation in pork backfat with slightly increased levels of polyenoic fatty acids

Backfats with slightly increased levels of polyenoic fatty acids (up to about 15·0%) were obtained by fattening pigs with diets containing increasing amounts of corn cob mix (an ensiled corn and cob mixture). The diet with the highest CCM content was also supplemented with 100ppm dl--tocopheryl acetate. Cuts of backfat were stored up to 9 months at −20°C in the dark, packed under vacuum (Suprovac bags) and in polyethylene pouches.

During and after storage no evidence of rancidity was observed for any of the samples. With regard to lipid oxidation, no significant advantage of sealing under vacuum, compared with packaging in polyethylene pouches, was observed. Lipids in the backfats produced on the diet supplemented with dl--tocopheryl acetate appeared slightly more stable towards oxidation than the fats obtained with the regular diet. However, as a shelf life of over 9 months at −20°C for packaged backfat is considered quite acceptable, supplementation of the rations with dl--tocopheryl acetate for this commodity does not appear recommendable.