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Abstract
This paper presents an acquisition system and a procedure to capture 3D scenes in different spectral bands. The acquisition system is formed by a monochrome camera, and a Liquid Crystal Tunable Filter (LCTF) that allows to acquire images at different spectral bands in the [480, 680]nm wavelength interval. The Synthetic Aperture Integral Imaging acquisition technique is used to obtain the elemental images for each wavelength. These elemental images are used to computationally obtain the reconstruction planes of the 3D scene at different depth planes. The 3D profile of the acquired scene is also obtained using a minimization of the variance of the contribution of the elemental images at each image pixel. Experimental results show the viability to recover the 3D multispectral information of the scene. Integration of 3D and multispectral information could have important benefits in different areas, including skin cancer detection, remote sensing and pattern recognition, among others.
Highlights
Applications of three-dimensional (3D) optical image sensing and visualization technologies span a wide range of areas including TV broadcasting, 3D displays, entertainment, medical sciences and robotics, to name a few [1,2,3]
It consists of a Marlin F080B model camera, whose CCD sensor size is 4.80 × 3.62mm and a Liquid Crystal Tunable Filter (LCTF) covering the [400, 720]nm spectral range
We have shown the viability to implement a multispectral 3D integral imaging acquisition and reconstruction system
Summary
Applications of three-dimensional (3D) optical image sensing and visualization technologies span a wide range of areas including TV broadcasting, 3D displays, entertainment, medical sciences and robotics, to name a few [1,2,3]. In this paper we present 3D multispectral bands integral imaging, including scene capture and the 3D reconstruction results. The acquisition of the elemental images is made using a monochrome camera and a liquid crystal tunable filter (LCTF), applying the Integral Imaging technique, at different wavelengths from 480 to 680nm. It consists of a Marlin F080B model camera, whose CCD sensor size is 4.80 × 3.62mm (and the image size is 1032 × 778 pixels) and a Liquid Crystal Tunable Filter (LCTF) covering the [400, 720]nm spectral range. The acquisition time and grey level value are considered to increase linearly, if illumination and distance to object do not vary. The method consists of selecting two (time, grey − level) pairs not allocated at extreme values, and assessing the exposure time considering a linear dependence between the grey scale value and the exposure time
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