Optimization of 3D Point Clouds of Oilseed Rape Plants Based on Time-of-Flight Cameras.

Three-dimensional (3D) structure is an important morphological trait of plants for describing their growth and biotic/abiotic stress responses. Various methods have been developed for obtaining 3D plant data, but the data quality and equipment costs are the main factors limiting their development. Here, we propose a method to improve the quality of 3D plant data using the time-of-flight (TOF) camera Kinect V2. A K-dimension (k-d) tree was applied to spatial topological relationships for searching points. Background noise points were then removed with a minimum oriented bounding box (MOBB) with a pass-through filter, while outliers and flying pixel points were removed based on viewpoints and surface normals. After being smoothed with the bilateral filter, the 3D plant data were registered and meshed. We adjusted the mesh patches to eliminate layered points. The results showed that the patches were closer. The average distance between the patches was 1.88 × 10-3 m, and the average angle was 17.64°, which were 54.97% and 48.33% of those values before optimization. The proposed method performed better in reducing noise and the local layered-points phenomenon, and it could help to more accurately determine 3D structure parameters from point clouds and mesh models.

Intestinal obstruction, obturator hernia, and/or colonic neoplasms: a case study.

Occlusive hernias are rare and difficult to diagnose. We present an extraordinary case of simultaneous occurrence of an obturator hernia with colon cancer. An 86-year-old woman arrived at the hospital after ˃2 weeks of abdominal pain, nausea, vomiting, and constipation. The computed tomography axis map showed that part of the right lower abdominal small intestine had intruded into the femoral triangle through the obturator, which was diagnosed as an obturator hernia. When the abdominal cavity was opened for herniorrhaphy, a 4 × 4 cm colon mass was observed. Only herniorrhaphy was performed, without any complications. At present, there has been no report of the coexistence of occlusive hernia and colon cancer; the main symptoms are intestinal obstruction, nausea, vomiting, and constipation. The decision whether the tumor should be removed simultaneously with herniorrhaphy and/or a mesh patch.