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Thermal inspections of buildings contribute to detection of damaged and weak spots in the building hull. 3D spatial reference for this purpose can be achieved combining infrared images with 3D building models via texture mapping. Using terrestrial image sequences from a camera mounted in a mobile platform frontal faces can be captured, while airborne image sequences can be taken for roofs and inner...
In order to solve the calibration of camera extrinsic parameters problem in texture mapping,this paper presents a geometric calibration method based on four point pairs.The first one select three points in the world coordinate system and calculate their coordinates in the camera coordinate system(world point, light heart, and image point are colinear). Transform the coordinates to a reference coordinate...
This paper points out and attempts to remedy a serious discrepancy in results obtained by global calibration methods: The re-projection error can be rendered very small by these methods, but we show that the optical distortion correction is far less accurate. This discrepancy can only be explained by internal error compensations in the global methods that leave undetected the inadequacy of the distortion...
In the field of environment perception, image segmentation and region classification methods are of high interest. For the development of assistance systems based on the environmental situation, reliable information must be acquired. To achieve robust object detection, algorithms based on laser scanners or time of flight (tof) cameras outperform standard video image based methods. However, for region...
In this paper we present a methodology to accurately derive 3D photo models of a World Heritage monument by means of terrestrial laser scanning (TLS) and close range photogrammetry. TLS will provide 3D point clouds as well as rough photo models that can substantially be improved draping texture with external imagery. The tomb Djin Block No. 9 in Petra is used to compare texture results delivered by...
We propose a novel method to accurately estimate the global position of a moving car using an omnidirectional camera and untextured 3D city models. The camera is oriented upwards to capture images of the immediate skyline, which is generally unique and serves as a fingerprint for a specific location in a city. Our goal is to estimate global position by matching skylines extracted from omni-directional...
We present a contribution to the digital preservation of artworks made by the Wauja and Karaja indians; both communities acknowledged for their expertise in ceramic artworks and the symbolism embedded in their art. Our goal is to enhance the texture color quality of 3D models obtained from color and depth images of a laser scanner. Although laser scanners offer high-performance regarding depth information,...
This study presents a low-cost scanning system for acquiring 3D geometry and texture information of large objects and for performing multi-scanning patch registration to obtain a whole realistic 3D model. The proposed system is composed of a line-stripe laser and a color CCD camera. The scanning processes consist of three steps. In the first step, the 3D depth information of the scanned object is...
3D modeling plays an important role in virtual reality interaction, immersive tele-presence and other applications. A CUDA-accelerated real-time 3D modeling system is presented in this paper. It captures multi-view images of objects and achieves real-time accurate visual hull reconstruction with texture mapping. The system includes off-line camera calibration and on-line visual hull modeling based...
This paper describes a method to correct the distortions in the images captured by a stereo video camera rig. We developed a code which can be implemented both on CPUs and GPUs which are used respectively to process still images or videos. The processing scheme is centered on the pre-calculation of a deformation texture, based on the physical properties of the camera setup (intrinsic parameters)....
Laser scanners are popular tools for acquiring a digital model of a real object. To achieve a realistic appearance the model needs to incorporate surface colour information in addition to the geometry. The task of mapping photos onto a 3D object is often referred to as texture mapping. This paper investigates the texturing of 3D surface models obtained with a FastSCANtrade hand-held laser scanner...
This paper presents a new method to increase the quality of 3D video, a new media developed to represent 3D objects in motion. This representation is obtained from multi-view reconstruction techniques that require images recorded simultaneously by several video cameras. All cameras are calibrated and placed around a dedicated studio to fully surround the models. The limited quality and quantity of...
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