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Construction of self-updating and reusable space models via vision-based sensing
Published in Manuel Martínez, Raimar Scherer, eWork and eBusiness in Architecture, Engineering and Construction, 2020
User interface server provides the communication between VIOLAS and the operator. It enables an operator to add and modify system data and to see system results on screen. The location values retrieved from the fusion table are combined with the values retrieved from the object inventory, and 2D graphical representations of the objects within the room are generated. Towards this end, the system represents every object as a minimum bounding-box covering the original object shape.
An Efficient Obstacle-Avoiding Rectilinear Steiner Tree Construction Method Using PB-SAT
Published in IETE Journal of Research, 2023
Sudeshna Kundu, Suchismita Roy, Shyamapada Mukherjee
Objective function: The objective function minimizes the wire length of RST considering all constraints (demand point, connectivity and obstacle avoidance) are satisfied. Here, minimum values of x and y-axis are represented by and respectively. Likewise, the maximum values of x and y-axis are signified by and . The region covered by minimum and maximum x, y-axis is termed as Minimum Bounding Box (MBB). Every point resides within the MBB is denoted by a Boolean variable . if the point representing x and y-axis by i and j is needed for RST construction, otherwise .
Integrated data-model-knowledge representation for natural resource entities
Published in International Journal of Digital Earth, 2022
Yulin Ding, Zhaowen Xu, Qing Zhu, Hankan Li, Yan Luo, Ying Bao, Lingjun Tang, Sen Zeng
The calculation of spatial relationships () can be performed using spatial analysis algorithms. Assuming that REL is an operator for mapping and calculating, the following equation shows the relation between them: When the reference object is much larger than the object to be located, the latter is often represented by a point, while a reference object is often represented by a bounding box. Therefore, an axis-aligned minimum bounding box (AABB) was introduced to reduce the misjudgment resulting from the loose boundary. The axis-aligned minimum bounding box for a given point set is its minimum bounding box, subject to the constraint that the edges of the box are parallel to the Cartesian coordinate axes. The axis-aligned minimal bounding boxes were used to define a simple descriptor of their shape. Thus, the center point of the bounding box can be calculated and used as the approximate location of an object in question.
Pedestrian detection based on YOLOv3 multimodal data fusion
Published in Systems Science & Control Engineering, 2022
Cheng Wang, Yuan-sheng Liu, Fei-xiang Chang, Ming Lu
The process consists of the following steps: 1) Use the point cloud of the target as the input; 2) Calculate the 2D projection of the target, which is the polygon in the XY plane from a bird’s-eye view; 3) Calculate the points’ convex hull to obtain the target polygon’s vertices. 4) Sort the resulting vertices clockwise. 5) According to the sorted vertices, two points are on one edge, and the other points are projected to obtain rectangular regions of different sizes.6) Select the rectangular box with the smallest border area as the minimum bounding box of the target.