In this paper, efficient and generic tools for calibration and 3D reconstruction are presented. These tools exploit geometric constraints frequently present in man-made environments and allow camera calibration as well as scene structure to be estimated with a small amount of user interactions and little a priori knowledge. The proposed approach is based on primitives that naturally characteriz...

This paper presents a process combining range and intensity based techniques, in order to get better 3D models than those obtained using these techniques separately. The procedure needs an initial estimation for internal and external camera parameters for two or more intensity images. The technique uses passive triangulation to refine initial camera calibrations and ensure a good registration o...

With 3D scans, detailed models of both coin sides can be obtained which allow a more accurate analysis. When using virtual 3D models of a coin, high accuracy is a prerequisite for further coin documentation and coin identification processes. The difference between the original coin model and its virtual 3D model counterpart should be as minimal as possible. In this paper, we present an evaluati...

The article describes a multi-resolution approach developed for the 3D modeling of the entire Roman Forum in Pompeii, Italy. The archaeological area, approximately 150 x 80 m, contains more than 350 finds spread all over the Forum as well as larger mural structures of previous buildings and temples. The interdisciplinary 3D modeling work consists of a multi-scale imageand range-based digital do...

The objectives of this work are a recreation of 3D models of selected archaeological open-air and roofed theatres of the Hellenistic and Roman period, and a creation of the real-time crowd engine in order to animate autonomously the virtual audience. We present a methodology for creation of virtual audience using a collection of tools, including custom ones developed specifically for this task ...

This paper proposes a novel shape representation “electric force features”, which is based on electric field theory. This representation has several benefits. First, it is invariant to scale and rigid transform. Second, it can represent complex and ill-defined models because of its physical background. 3D model supposed as charged body, we get the electric field force distribution by placing so...

Virtual/mixed reality 3D models of real-world environments can be used to run behavioural and other experiments with real human subjects, replacing the traditional approach where studies are conducted in physical environments. Use of the virtual/mixed reality environments can minimize problems related to feasibility, experimental control, ethics and cost, but care must be taken to ensure that t...

We propose a method for 3D reconstruction of structured environments from a single omnidirectional image. It is based on a reduced amount of user information, in the form of 2D pixel coordinates, alignment and coplanarity properties amongst subsets of the corresponding 3D points. Just a few panoramic images are sufficient for building the 3D model, as opposed to a larger number of “normal” imag...

This article deals with the representation of video sequences for very low bitrate coding. From a uncalibrated video sequence of a static scene captured with a monocular moving camera we can automatically compute a 3D model stream. We propose a method using those models to reconstruct the original sequence or a virtual one, allowing to freely navigate in the sequence. We added an automatic 3D m...

This article introduces a novel representation for three-dimensional (3D) objects in terms of local affine-invariant descriptors of their images and the spatial relationships between the corresponding surface patches. Geometric constraints associated with different views of the same patches under affine projection are combined with a normalized representation of their appearance to guide matchi...