BACKGROUND In three-dimensional echocardiography (3DE), individual endocardial trabeculae are not clearly visible necessitating left ventricular (LV) volumes to be measured by tracing the innermost endocardial contour. Ultrasound contrast agents aim to improve endocardial definition, but may delineate the outermost endocardial contour by filling up intertrabecular space. Although measurement re...

PURPOSE Computerized liver extraction from hepatic CT images is challenging because the liver often abuts other organs of a similar density. The purpose of this study was to develop a computer-aided measurement of liver volumes in hepatic CT. METHODS The authors developed a computerized liver extraction scheme based on geodesic active contour segmentation coupled with level-set contour evolut...

Depth Image Based Rendering (DIBR), as a freeviewpoint synthesis technique, enables interactive selection of the view for watching. However, many rendering methods based on DIBR usually bring contour, crack and disocclusion artifacts. To address these problems, we propose effective methods to remove these artifacts. Firstly, before warping, the reference depth maps and color images are analyzed...

Existing problems for 3D extended target tracking and contour reconstruction under clutter environment are thoroughly investigated in this article. Due to the sparsity of available point cloud data interference from clutter, shape completion method, such as Point Completion Network (PCN), cannot reconstruct directly. Moreover, traditional Gaussian process (GP) model suffered computing overhead ...

Contour milling is characterized by quasi-stationary, which leads to the occurrence of a machining error caused elastic deflections system. Moreover, such an cannot be eliminated sub-adjusting control program "for size", since it not constant and changes along contour in wide range. To ensure accuracy milling, new method combined proposed, uses posteriori information machine verification measur...

Topographical measurements of surfaces yield a lot of data which are usually presented by tables of height coordinates or by contour maps. Here a method is described to characterize the surface geometry by just a few parameters which quantify the functional properties: sphericity, twist and waviness. Examples of applications are given from the field of surface plate measurement. Some measuremen...

In the paper, analysis of curved profile measurement accuracy is described. Since there was no CAD model or other reference for measured detail, first step to generate contour cam using technical drawing and tolerance requirements. The test campaign consisted three experiments aimed at determining effect scanning velocity on results form deviation δ measurement, evaluation uncertainty repeatabi...

In contour milling, to render the machining process more automated with significant productivity without remaining material after machining, a new recovery coefficient was developed. The coefficient was inserted in the computation of contour parallel tool paths to fix the radial depth of cut in the way to ensure an optimized overlap area between the passes in the corners, without residuals. Thu...