Influence of geometric parameters and image preprocessing on tomo- PIV results
نویسندگان
چکیده
The tomography-PIV is using multiple camera views for a full tomographic reconstruction of the object space, which is represented by a 3-D voxel structure with a resolution adapted to the camera resolution. Influences of different parameters such as the images pre-processing, the volume discretization and the weighting matrix, the algorithm initialization and the cameras angles, the volume thickness and the particle density are studied on synthetic and real images.
منابع مشابه
Direct experimental comparison between tomo-PIV and scanning tomo-PIV: wake flow behind a half-cylinder
In this paper, a direct experimental comparison is made between scanning and tomo-PIV, on an unsteady wake flow behind a half-cylinder. Several seeding densities are used in order to demonstrate the capacities and limitations of both techniques. For the scanning technique, the effect of particles elongation is investigated and the influence of the seeding density on the volume reconstruction fo...
متن کاملEnhancing Tomo-PIV reconstruction quality by reducing ghost particles
A technique to enhance the reconstruction quality and consequently the accuracy of the velocity vector field obtained in Tomo-PIV experiments is presented here. The methodology involves detecting and eliminating spurious outliers in the reconstructed intensity field (ghost particles). A simulacrum matching-based reconstruction enhancement (SMRE) technique is proposed, which utilizes the charact...
متن کاملA three-dimensional strain measurement method in elastic transparent materials using tomographic particle image velocimetry
BACKGROUND The mechanical interaction between blood vessels and medical devices can induce strains in these vessels. Measuring and understanding these strains is necessary to identify the causes of vascular complications. This study develops a method to measure the three-dimensional (3D) distribution of strain using tomographic particle image velocimetry (Tomo-PIV) and compares the measurement ...
متن کامل3-d Least Squares Tracking in Time-resolved Tomographic Reconstruction of Dense Flow Marker Fields
Flow measurement techniques determine velocity vector fields in liquid or gas flows. In fluid mechanics, many methods are based on seeding particles to visualize the flow imaged by an adequate camera system. The tomo-PIV (tomographic particle image velocimetry) technique presented in this paper generates time-resolved volumetric reconstructions of a particle constellation from a limited number ...
متن کاملارائه روشی برای پیش‌پردازش تصویر جهت بهبود عملکرد JPEG
A lot of researchs have been performed in image compression and different methods have been proposed. Each of the existing methods presents different compression rates on various images. By identifing the effective parameters in a compression algorithm and strengthen them in the preprocessing stage, the compression rate of the algorithm can be improved. JPEG is one of the successful compression...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2013