AI Article Synopsis
- - In phase-measurement profilometry (PMP), the gamma effect can distort phase patterns like water ripples, affecting accuracy.
- - Gamma correction helps reduce these distortions from commercial projectors, but defocusing can lead to errors in calculating the true gamma value.
- - This study introduces a method using duty ratio (DR) to create gamma mapping, resulting in an accurate gamma calculation with less than 3.5% error, showing robustness to projector defocus and improved surface reconstruction post-correction.
Article Abstract
In phase-measurement profilometry (PMP), the gamma effect can cause severe nonlinear distortion of the phase pattern (i.e., water ripples on the surface profile). Gamma correction is an effective method to eliminate the gamma effects of commercial projectors. However, projector defocusing on the suppression of higher harmonics inevitably results in an estimated gamma deviation from the true value. In this study, gamma mapping is constructed using the duty ratio (DR) to code the chord distribution of the simulated distorted phase while considering projector defocusing. With the known gamma mapping, the accurate gamma is calculated by DR coding of the actual distorted phase under projector defocusing. Simulated experiments verified that the relative errors of the gamma calculated by the proposed method under different degrees of defocus were less than 3.5%. Furthermore, the experimental results demonstrate that the proposed gamma calculation method is robust to the defocus effect of the projector and that a smoother surface can be reconstructed after gamma correction.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/AO.453061 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Article Synopsis
- Phase-shift profilometry (PSP) is a precise optical 3D measurement technique that has gained popularity due to its effectiveness in varying light conditions, particularly in high-speed applications.
- Traditional high-frame rate PSP methods face limitations in measurement depth due to binary defocusing projections; this study introduces a new technique using a specially designed LED chip array that enables both high-speed and larger depth measurement.
- The developed PSP projector successfully captured 3D reconstructions at frame rates of 1 kHz and 100 kHz, demonstrating its potential for even higher speeds and making it highly suitable for measuring dynamic objects.
Fast Three-Dimensional Profilometry with Large Depth of Field.
Sensors (Basel)
June 2024
Intelligent Equipment Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
By applying a high projection rate, the binary defocusing technique can dramatically increase 3D imaging speed. However, existing methods are sensitive to the varied defocusing degree, and have limited depth of field (DoF). To this end, a time-domain Gaussian fitting method is proposed in this paper.
View Article and Find Full Text PDFA binary defocusing method has a significant impact on improving 3D shape measurement quality for digital fringe projector (DFP) techniques. In this paper, an optimization framework using the dithering method is presented. This framework utilizes genetic algorithm and chaos maps to optimize the bidirectional error-diffusion coefficients.
View Article and Find Full Text PDFDigital fringe projection (DFP) with defocused binary fringe patterns has the ability to overcome the projector nonlinearity and achieve a high-speed 3D measurement. The Floyd-Steinberg (FS) dithering technique is one of the most commonly adopted binary fringe coding methods due to its relatively high measurement accuracy. Nevertheless, we found that the FS binary fringe would cause a fixed error in the recovered phase, which is proven to be invariable for various defocusing levels and various phase-shift steps according to the analysis of the phase error based on noise model of phase-shifting profilometry.
View Article and Find Full Text PDFArticle Synopsis
- - In phase-measurement profilometry (PMP), the gamma effect can distort phase patterns like water ripples, affecting accuracy.
- - Gamma correction helps reduce these distortions from commercial projectors, but defocusing can lead to errors in calculating the true gamma value.
- - This study introduces a method using duty ratio (DR) to create gamma mapping, resulting in an accurate gamma calculation with less than 3.5% error, showing robustness to projector defocus and improved surface reconstruction post-correction.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!