19,674 research outputs found
Calibration and Sensitivity Analysis of a Stereo Vision-Based Driver Assistance System
Az http://intechweb.org/ alatti "Books" fĂŒl alatt kell rĂĄkeresni a "Stereo Vision" cĂmre Ă©s az 1. fejezetre
Evaluation of CNN-based Single-Image Depth Estimation Methods
While an increasing interest in deep models for single-image depth estimation
methods can be observed, established schemes for their evaluation are still
limited. We propose a set of novel quality criteria, allowing for a more
detailed analysis by focusing on specific characteristics of depth maps. In
particular, we address the preservation of edges and planar regions, depth
consistency, and absolute distance accuracy. In order to employ these metrics
to evaluate and compare state-of-the-art single-image depth estimation
approaches, we provide a new high-quality RGB-D dataset. We used a DSLR camera
together with a laser scanner to acquire high-resolution images and highly
accurate depth maps. Experimental results show the validity of our proposed
evaluation protocol
Stereo Matching in the Presence of Sub-Pixel Calibration Errors
Stereo matching commonly requires rectified images that are computed from calibrated cameras. Since all under-lying parametric camera models are only approximations, calibration and rectification will never be perfect. Additionally, it is very hard to keep the calibration perfectly stable in application scenarios with large temperature changes and vibrations. We show that even small calibration errors of a quarter of a pixel are severely amplified on certain structures. We discuss a robotics and a driver assistance example where sub-pixel calibration errors cause severe problems. We propose a filter solution based on signal theory that removes critical structures and makes stereo algorithms less sensitive to calibration errors. Our approach does not aim to correct decalibration, but rather to avoid amplifications and mismatches. Experiments on ten stereo pairs with ground truth and simulated decalibrations as well as images from robotics and driver assistance scenarios demonstrate the success and limitations of our solution that can be combined with any stereo method
Accurate Telescope Mount Positioning with MEMS Accelerometers
This paper describes the advantages and challenges of applying
microelectromechanical accelerometer systems (MEMS accelerometers) in order to
attain precise, accurate and stateless positioning of telescope mounts. This
provides a completely independent method from other forms of electronic,
optical, mechanical or magnetic feedback or real-time astrometry. Our goal is
to reach the sub-arcminute range which is well smaller than the field-of-view
of conventional imaging telescope systems. Here we present how this
sub-arcminute accuracy can be achieved with very cheap MEMS sensors and we also
detail how our procedures can be extended in order to attain even finer
measurements. In addition, our paper discusses how can a complete system design
be implemented in order to be a part of a telescope control system.Comment: Accepted for publication in PASP, 12 page
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