According to the bio-characteristics of the lower and upper cavity surfaces of dental restoration, a stitching approach is proposed based on a virtual zipper working mechanism and a minimization of the surface total c...According to the bio-characteristics of the lower and upper cavity surfaces of dental restoration, a stitching approach is proposed based on a virtual zipper working mechanism and a minimization of the surface total curvature energy, which is used to resolve the stitching problems existing during computer-aided design for dental restorations. First, the two boundaries corresponding to the lower and upper surfaces are triangulated based on the zipper working mechanism to generate the initial stitching surface patch, of which the edges are distributed uniformly between the boundaries. Secondly, the initial stitching surface patch is subdivided and deformed to reconstruct an optimized surface patch according to the bio-characteristics of the teeth. The optimized surface patch is minimally distinguishable from the surrounding mesh in smoothness and density, and it can stitch the upper and lower cavity surfaces naturally. The experimental results show that the dental restorations obtained by the proposed method can satisfy both the shape aesthetic and the fitting accuracy, and meet the requirements of clinical oral medicine.展开更多
It is essential to measure the stitch length of weft knitted fabric in a static environment for economy and improving productivity. The image inputted was dealt with the digital image processing techniques： the paper...It is essential to measure the stitch length of weft knitted fabric in a static environment for economy and improving productivity. The image inputted was dealt with the digital image processing techniques： the paper carried out the transformation of grey scale; then removed impurities with filtering; the characteristic of the stitch structure was abstracted by using the Fourier transform technique. To obtain the stitch length more accurately, we should establish ageometric medal of the stitch lined on the digital image processing, which provides a way to transform the stitch length in the two-dimenslon space into a three-dimension space. This study provides a new methed for measuring the stitch length without damaging the fabric.展开更多
针对目前传统安检方法对于车辆底盘表面藏匿的违禁物品的检测效率低、漏检率高、便携性差等不足,设计了一个基于云端的移动式智能车底藏匿物检测系统,通过机器人、网络通信、图像处理及目标检测等技术,实现藏匿物智能化检测。基于SIFT(S...针对目前传统安检方法对于车辆底盘表面藏匿的违禁物品的检测效率低、漏检率高、便携性差等不足,设计了一个基于云端的移动式智能车底藏匿物检测系统,通过机器人、网络通信、图像处理及目标检测等技术,实现藏匿物智能化检测。基于SIFT(Scale-Invariant Feature Transform)算法提取图像特征信息并获取车底局部全景图像,使用YOLOv5(You Only Look Once version 5)深度神经网络模型检测4种车底藏匿物,搭建云数据库存储车辆信息,轮式机器人、上位机、云数据库之间通过TCP/IP(Transmission Control Protocol/Internet Protocol)协议进行通信。经测试,该系统能在特定场景下完成车底藏匿物检测,图像拼接成功率达81.7%,目标检测准确率达83.7%,在车底安检领域具有一定的实用价值。展开更多
基金The National High Technology Research and Development Program of China(863 Program)(No.2005AA420240)the Key Science and Technology Program of Jiangsu Province (No.BE2005014)
文摘According to the bio-characteristics of the lower and upper cavity surfaces of dental restoration, a stitching approach is proposed based on a virtual zipper working mechanism and a minimization of the surface total curvature energy, which is used to resolve the stitching problems existing during computer-aided design for dental restorations. First, the two boundaries corresponding to the lower and upper surfaces are triangulated based on the zipper working mechanism to generate the initial stitching surface patch, of which the edges are distributed uniformly between the boundaries. Secondly, the initial stitching surface patch is subdivided and deformed to reconstruct an optimized surface patch according to the bio-characteristics of the teeth. The optimized surface patch is minimally distinguishable from the surrounding mesh in smoothness and density, and it can stitch the upper and lower cavity surfaces naturally. The experimental results show that the dental restorations obtained by the proposed method can satisfy both the shape aesthetic and the fitting accuracy, and meet the requirements of clinical oral medicine.
文摘It is essential to measure the stitch length of weft knitted fabric in a static environment for economy and improving productivity. The image inputted was dealt with the digital image processing techniques： the paper carried out the transformation of grey scale; then removed impurities with filtering; the characteristic of the stitch structure was abstracted by using the Fourier transform technique. To obtain the stitch length more accurately, we should establish ageometric medal of the stitch lined on the digital image processing, which provides a way to transform the stitch length in the two-dimenslon space into a three-dimension space. This study provides a new methed for measuring the stitch length without damaging the fabric.
文摘针对目前传统安检方法对于车辆底盘表面藏匿的违禁物品的检测效率低、漏检率高、便携性差等不足,设计了一个基于云端的移动式智能车底藏匿物检测系统,通过机器人、网络通信、图像处理及目标检测等技术,实现藏匿物智能化检测。基于SIFT(Scale-Invariant Feature Transform)算法提取图像特征信息并获取车底局部全景图像,使用YOLOv5(You Only Look Once version 5)深度神经网络模型检测4种车底藏匿物,搭建云数据库存储车辆信息,轮式机器人、上位机、云数据库之间通过TCP/IP(Transmission Control Protocol/Internet Protocol)协议进行通信。经测试,该系统能在特定场景下完成车底藏匿物检测,图像拼接成功率达81.7%,目标检测准确率达83.7%,在车底安检领域具有一定的实用价值。
