一种快速鲁棒性的视差图像拼接方法

当小型旋翼无人机超低空飞行时,不同位置拍摄的图像中极易出现结构视差。传统基于全局投影的拼接方法在处理视差图像时会出现伪影或畸变。最近的自适应拼接方法,如As-Projective-As-Possible(APAP)及其优化方法,使用“网格”来构建密集的局部投影场域,以改善视差图像拼接的对齐度和自然度,但计算复杂度较大。为此,提出了一种新颖的视差图像拼接方法,以深度稠密投影(Deep Dense Projection,Deep-DP)为特征匹配框架,设计了一种轻量化并行计算框架求解平滑形变场,以实现视差图像无缝拼接。在对比试验中,该算法平均运行时间达到0.2 s,显著优于其他先进算法,并且对齐质量和自然度达到了相近水平。提出的算法在兼顾图像拼接准确性的同时,计算效率显著提高。

基于特征约束和变形的三维人脸模型纹理映射

为了能够快速生成人脸纹理细节,提出基于特征点约束和变形的三维人脸模型纹理映射和重建方法。首先利用ASM算法提取人脸特征点,然后用平滑性调整的RBF插值函数使一般人脸模型向特定人脸形变,接下来对人脸模型进行平面参数化,最终通过粗对齐与纹理优化得到纹理映射效果。实验表明,该方法能在较短时间内生成较真实的人脸纹理映射与重建效果。

Changes of smooth muscle contractile filaments in small bowel atresia

AIM:To investigate morphological changes of intestinal smooth muscle contractile fibres in small bowel atresia patients.METHODS:Resected small bowel specimens from small bowel atresia patients(n = 12) were divided into three sections(proximal,atretic and distal).Standard histology hematoxylin-eosin staining and enzyme immunohistochemistry was performed to visualize smooth muscle contractile markers-smooth muscle actin(SMA) and desmin using conventional paraffin sections of the proximal and distal bowel.Small bowel from agematched patients(n = 2) undergoing Meckel's diverticulum resection served as controls.RESULTS:The smooth muscle coat in the proximal bowel of small bowel atresia patients was thickened compared with control tissue,but the distal bowel was unchanged.Expression of smooth muscle contractile fibres SMA and desmin within the proximal bowel was slightly reduced compared with the distal bowel and control tissue.There were no major differences in the architecture of the smooth muscle within the proximal bowel and the distal bowel.The proximal and distal bowel in small bowel atresia patients revealed only minimal differences regarding smooth muscle morphology and the presence of smooth muscle contractile filament markers.CONCLUSION:Changes in smooth muscle contractile filaments do not appear to play a major role in postoperative motility disorders in small bowel atresia.