Productos de investigación
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12585/8849
Browse
Browsing Productos de investigación by Subject "3D imaging"
Now showing 1 - 2 of 2
- Results Per Page
- Sort Options
Item Hybrid lighting enhances color accuracy in DLP-based 3D imaging(2024-08) Barrios, Erik; Pineda, Jesus; Romero, Lenny A.; Millan, María S.; Marrugo, Andres G.Color accuracy is of immense importance in various fields, including biomedical applications, cosmetics, and multimedia. Achieving precise color measurements using diverse lighting sources is a persistent challenge. Recent advancements have resulted in the integration of LED-based Digital Light Processing (DLP) technology into many scanning devices for 3D imaging, often serving as the primary lighting source. However, such setups are susceptible to color-accuracy issues. Our study delves into DLP-based 3D imaging, specifically focusing on the use of hybrid lighting to enhance color accuracy. We presented an empirical dataset containing skin tone patches captured under various lighting conditions, including combinations and variations in indoor ambient light. A comprehensive qualitative and quantitative analysis of color differences (∆E 00 ) across the dataset was performed. Our results support the integration of DLP technology with supplementary light sources to achieve optimal color correction outcomes, particularly in skin tone reproduction, which has significant implications for biomedical image analysis and other color-critical applications.Item Wide-field 3D imaging with an LED pattern projector for accurate skin feature measurements via Fourier transform profilometry(SPIE, 2019) Marrugo A.G.; Romero L.A.; Meneses J.; Harding K.G.; Zhang, SongAccurate 3D imaging of human skin features with structured light methods is hindered by subsurface scattering, the presence of hairs and patient movement. In this work, we propose a wide-field 3D imaging system capable of reconstructing large areas, e.g. the whole surface of the forearm, with an axial accuracy in the order of 10 microns for measuring scattered skin features, like lesions. By pushing the limits of grating projection we obtain high-quality fringes within a limited depth of field. We use a second projector for accurate positioning of the object. With two or more cameras we achieve independent 3D reconstructions automatically merged in a global coordinate system. With the positioning strategy, we acquire two consecutive images for absolute phase retrieval using Fourier Transform Profilometry to ensure accurate phase-to-height mapping. Encouraging experimental results show that the system is able to measure precisely skin features scattered in a large area. Copyright © 2019 SPIE.