Open Access
Effects of window size and shape on accuracy of subpixel centroid estimation of target images
Sharon S. Welch
- Vol. 94, pp 15990
Reads0
Chats0
TLDR
A new algorithm was developed to improve the dynamic range of a close-range photogrammetric tracking system that provides feedback for control of a large gap magnetic suspension system (LGMSS).Abstract:
A new algorithm is presented for increasing the accuracy of subpixel centroid estimation of (nearly) point target images in cases where the signal-to-noise ratio is low and the signal amplitude and shape vary from frame to frame. In the algorithm, the centroid is calculated over a data window that is matched in width to the image distribution. Fourier analysis is used to explain the dependency of the centroid estimate on the size of the data window, and simulation and experimental results are presented which demonstrate the effects of window size for two different noise models. The effects of window shape were also investigated for uniform and Gaussian-shaped windows. The new algorithm was developed to improve the dynamic range of a close-range photogrammetric tracking system that provides feedback for control of a large gap magnetic suspension system (LGMSS).read more
Citations
More filters
Proceedings ArticleDOI
A low-cost laser distance sensor
TL;DR: This paper describes a compact, planar laser distance sensor (LDS) that has capabilities comparable to current laser scanners: 3 cm accuracy out to 6 m, 10 Hz acquisition, and 1 degree resolution over a full 360 degree scan.
Journal ArticleDOI
A one-step intrinsic and extrinsic calibration method for laser line scanner operation in coordinate measuring machines
TL;DR: The results obtained in accuracy and repeatability tests performed on gauge geometric primitives attest to the viability of this technique for the integration of LTSs in CMMs.
Journal ArticleDOI
Sub-pixel measurement of 3D surfaces by laser scanning
TL;DR: A method for sub-pixel measurement of 3D surfaces based on vision cameras and structured light and reconstruction algorithms have been selected to fulfil the accuracy and processing speed demanded in industrial applications.
Journal ArticleDOI
Modelling and Calibration Technique of Laser Triangulation Sensors for Integration in Robot Arms and Articulated Arm Coordinate Measuring Machines
TL;DR: A technique for intrinsic and extrinsic calibration of a laser triangulation sensor (LTS) integrated in an articulated arm coordinate measuring machine (AACMM) that allows the integration of LTS and AACMM mathematical models without the need of additional optimization methods after the prior sensor calibration.
Journal ArticleDOI
Generation of High-resolution Three-dimensional Reconstructions of the Seafloor in Color using a Single Camera and Structured Light
TL;DR: A three‐dimensional mapping method based on light sectioning that enables the simultaneous capture of both structure and color from the images of a single camera is proposed that has been deployed on a total of 11 cruises to survey manganese‐rich crust deposits in the Pacific.
References
More filters
Journal ArticleDOI
Linear systems, Fourier transforms, and optics
TL;DR: In this article, a list of the best book collections and completed collections can be found and the soft file of the book can be read and then download the book and get it.
Journal ArticleDOI
Modulation-transfer-function analysis for sampled image systems.
TL;DR: This paper demonstrates that a meaningful system response can be calculated by averaging over an ensemble of point-source system inputs to yield an MTF which accounts for the combined effects of image formation, sampling, and image reconstruction.
Journal ArticleDOI
Elimination of systematic error in subpixel accuracy centroid estimation [also Letter 34(11)3347-3348(Nov1995)]
Brian F. Alexander,Kim Chew Ng +1 more
TL;DR: Both simulation and experimental tests of the centroid method for subpixel accuracy image feature location prediction are presented for the case of the location of the center lines of the images of projected light stripes in a triangulation-based three-dimensional shape measurement system.
Journal ArticleDOI
The Definition of the OTF and the Measurement of Aliasing for Sampled Imaging Systems
TL;DR: The conventional concept of OTF cannot be applied to sampled imaging systems which exhibit aliasing effects, but the concept can be extended to this class of systems if the condition of isoplanatism is redefined, and if only a limited range of spatial frequencies is considered.
Journal ArticleDOI
Image sampling, reconstruction, and the effect of sample-scene phasing.
TL;DR: This paper is a 1-D analysis of the degradation caused by image sampling and interpolative reconstruction that includes the sample-scene phase as an explicit random parameter and provides a complete characterization of this image degradation as the sum of two terms.