一种快速有效的交互式医学序列图像分割方法

提出了一种结合Live-Wire算法、种子填充以及轮廓插值的序列医学图像分割算法。该方法首先将病灶组织形状变化较大的断层图像作为关键层,然后综合应用Live-Wire算法和种子填充对关键层中病灶区域进行分割,最后利用轮廓插值技术对中间的过渡图像进行自动分割。实验表明这种算法能快速有效地从序列医学图像中分割出感兴趣的物体。     

宽带信号的中频正交采样

在回顾并对比低通滤波法、插值法和多相滤波法三种中频正交采样方法的基础上,研究它们在宽带信号情况下的适用性,讨论宽带信号的中频正交采样方法及其工程实现,并进行计算机仿真。结果表明,低通滤波法更适合于宽带信号的中频正交化处理。     

Study of frame-rate up conversion based on H.264

In this study, a low complexity frame-rate up conversion method using compressed domain information for H.264 decoder is proposed. In the proposed scheme, the motion vectors (MVs) are estimated using constant acceleration motion model, and the MVs regarded as no credibility are corrected, and the interpolation method is applied on the basis of the macroblock (MB) coded types. Applied to the H.264 decoder, the proposed method provides high quality interpolation frames and an obvious decrease of the block artifacts.     

一类基于函数值的有理三次样条曲线的形状控制

将插值曲线约束于给定的区域之内是曲线形状控制中的重要问题.构造了一种基于函数值的分母为二次的C1连续有理三次插值样条.这种有理三次插值样条中含有调节参数,因而给约束控制带来了方便.给出了将该种插值曲线约束于给定的折线、二次曲线之上、之下或之间的充分条件及将其约束于给定折线之上、之下或之间的充分必要条件.     

物体运动路线多样化模拟

在现代仿真技术和游戏动画中,越来越多的物体可以按照实时指定的关键位置在平面上进行移动,然而,早期的运动控制算法只是在需要转弯的关键点进行机械的转向.通过引入样条曲线,可以获得较好的运动路线.然而,在不同的物体依照同一路线进行运动时,运动路线是相似的,没有考虑到物体间的差异.设计的算法在原有通过样条曲线插值计算运动路线的基础上,将物体的重量、形状特征以及当前的运动速度加入到路线计算的影响因素中,可以根据物体相关运动属性实时生成运动路线.     

用三坐标数控铣床加工空间曲面时的圆弧插值算法

论述了在三坐标数控铣床上采用球头铣刀铣削空间复杂形面时圆弧插值的计算方法.把刀具中心等距曲线轨迹的计算归结为计算零件轮廓上点的坐标,确定了加工空间等距曲线时插值点的计算流程图.利用圆弧插值算法推导出了坐标增量计算公式,此公式可应用到数控装置修正刀具的半径,从而提高零件廓形的加工精度.此算法也可应用到端铣刀加工时圆弧插值的计算.     

一种改进的自适应图像传感器数据插值算法

提出了一种改进的自适应插值算法,以改善传统图像传感器图像色调变化幅度过大,图像视觉效果不理想等问题.该算法适于硬件实现.数值实验证明,处理后图像的峰值信噪比有所提高.     

Filial family play therapy with an adoptive family: A response to preadoptive child maltreatment.

This article describes an in-depth case study analysis of the process of working therapeutically with a family, who adopted a young male after several child maltreatment experiences, using filial family play therapy. Psychological and behavioral assessments conducted before and after the play therapy process illustrates a varying picture of results in the scores of both parent and child functioning. In-depth narratives collected from the adoptive parents a year later reflect the positive influence the play therapy process had on long-term family dynamics. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Nanostructured TiO2-based mixed metal oxides prepared using microemulsions for carbon monoxide detection

Nanostructured powders of Nb-doped TiO₂ (TN) and SnO₂ mixed with Nb-doped TiO₂ in two different atomic ratios—10 to 1 (TSN 101) and 1 to 1 (TSN 11)—were synthesized using the reverse micelle microemulsion of a nonionic surfactant (brine solution/1-hexanol/Triton X-100/cyclohexane). The powders were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Thick films were fabricated for gas sensors and characterized by XRD analysis and field emission scanning electron microscopy (FE-SEM). The effects of the film morphology and firing temperature in the range 650–850 °C on CO sensitivity were studied. The best gas response, expressed as the ratio between the resistance in air and the resistance under gas exposure (R _air/R _gas), was measured for TSN 11 at 11 for 1,000 ppm CO exposure. All types of sensors showed good thermal stability. The electrochemical impedance spectroscopy (EIS) measurements were performed in different gas atmospheres (air, O₂, CO and NO₂) to better understand the electrical properties of the nanostructured mixed metal oxides.     

基于形状的CT图像断层间数据插值算法

CT脑血管三维重建图像都是源自二维断层扫描,由于二维断层扫描图像是对一定厚度的三维物体在二维平面上的断层投影,在目前的技术水平下,相邻两断层图像间的扫描距离要大于同一断层中解剖组织相邻像素间的图像显示距离.为保证三维重建图像的质量,在研究了CT脑血管二维图像特征后,提出了一种新的基于形状和基于灰度的图像断层间数据插值算法,并取得了较理想的实验效果.