基于主动位移成像的图像超分辨率重建

超分辨重建算法是一种将低分辨率图像恢复为高分辨率图像的算法,被广泛用于医学、遥感、军事安防以及人脸识别等领域。在黑夜、远场场景下构建数据集比较困难,基于深度学习的超分辨重建算法应用受到阻碍。而微扫描成像技术扫描模式固定,对器件到位精度要求高。针对这两个问题,我们提出一种基于主动位移成像的图像超分辨率重建算法。具体地,在控制相机随机移动的同时记录采样时刻位移,通过解算、映射选图、精确匹配图像序列并获取多帧图像间的亚像素信息,然后对估计图像进行迭代和更新,最后重建获得高分辨率图像。实验结果表明,本算法在PSNR、SSIM和平均梯度三个指标上都优于最近提出的基于POCS的图像超分辨率重建算法MFPOCS,与基于CNN的方法ACNet相比具有竞争力。值得提出的是,本算法无需固定的扫描模式,降低了微扫描技术对器件实时到位精度的要求,同时,本算法可以保证重建初始帧的优良选取,有效规避了POCS算法的固有缺点。

膝关节前交叉韧带的MRI扫描方法对比

目的研究膝关节前交叉韧带(ACL)疾病的MR I表现,对比不同的扫描方法对ACL疾病的诊断结果。方法对我院40例膝关节前交叉韧带扫描的病例,采取回顾性方法分析不同方法对ACL的显示情况。结果斜冠状扫描法的显示率、诊断符合率、特异度、灵敏度均高于其它方法。结论斜冠状位扫描优于其它扫描方法,是ACL的较好的检查方法。

Acoustic Trauma of Guinea Pigs Caused by ^(60) Cobalt γ-Ray

Auditory cortical cvokod rcsponse（ACER） and auditory brainstom cvoked response（ABR） were recorded in guinea pigs before and after irradiation of 60Co γ-ray. A single dose ofirradiation on head was 90Gy and 70Gy in two groups, respectively. Two h after irradiation. thethreshold shift was 12. 5 dB and 9 dB, and the ACER （?） post-irradiation amplitude ex-ceeded the maximum pre-irradiation value by 20% and 37%. Six h after irradiation, the thresholdshift increased to 37 dB and the maximum amplitnde decreased to the level of pre-irradiation in70Gy-group. In another group, right auditory bulla arca was irradiated with a total dose of 45Gy ina course of six fractions/two weeks. Fourteen d after irradiation, the threshold shift of ABR was 118dB and the latency of wave I was longer. The amplitude-intensity curve was （?） afterirradiation. Histological observation using scanning （?） showed that only outer hair-cells in the basal coil of the cochlea were （?） 6 h after irrdiation 50Gy-group. Bul 16 hlater, outer, hair cells in all coils of the cochlea were found to be destroyed extensively and inner （?）cells were destroyed slightly. In 45Gy-group, 14 d after irradiation, outer hair cells in all coils of thecochlea were damaged and no inmer hair cell was injured severely.

微光成形法平面轮廓扫描路径的生成

提出一种基于任意形状平面图形的内、外轮廓数据处理的新方法 ,并针对AutoCAD实体模型的等高截交面轮廓的封闭有向环及内、外环进行判别 ,实现了平面轮廓扫描中的方向判别和轨迹生成的自动化。

热辐射扫描成像系统的实验研究

本文介绍一种最新研制的适合于基础物理实验的热辐射与红外扫描成像实验仪 ,利用它测量了有狭缝铝表面样品的红外图像 ,并与理论模拟的图像以及样品的实际值进行了比较。

负压下血管灌流固定兔肺组织的SEM观察

负压下经血管灌流固定的兔肺组织在扫描电镜下可观察到肺泡Ⅰ型细胞表面有少量微绒毛,肺泡Ⅱ型细胞的周围与Ⅰ型细胞之间形成环状的凹陷。Ⅱ型细胞表面具有散在的微绒毛肺泡壁的毛细血管形成网状隆起,并可见到大小不同的肺泡孔。