The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Camera calibration constitutes a basic problem in many robot applications. In this paper two algorithms tailored to the calibration of the parameters of a depth camera are proposed. More precisely, a closed form solution that requires the coordinates of three corresponding points in the world and the camera coordinates systems, for the noise free case is proposed. Moreover, a robust algorithm that...
Due to evolution of prevalent sophisticated digital video editing software it has become easier to forge any video. Copy-Move forgery is a special kind of video forgery technique, in which copy-move of the frame region is performed in intra frame or inter frames. This copy-move introduces a special kind of relationship between the original frame segment and the pasted one, which provides clue for...
In this paper, we propose an advanced way of reducing depth noise for time-of-flight (ToF) camera. Most of depth denoising method uses a filter with fixed parameter or sets parameter considering one factor: amplitude or distance. However, the depth noise is dependent on both amplitude and distance value. Thus, the characteristic of depth noise should consider two factors simultaneously: distance and...
Traditionally, fish stock assessment is a time-consuming, expensive, and invasive task, since fish are caught and counted using research vessels. Therefore, in a joint project a non-invasive, acoustic-optical Underwater Fish Observatory (UFO) is proposed and developed. The UFO counts and classifies fish utilizing a stereo camera system and a sonar system in order to observe the available biomass....
We previously proposed the artificial fiber (AF) patterns in order to be able to hide information in printed documents. AF pattern uses the features of the medium (e.g., paper). It has features of rotational invariance, low visibility of the hidden information. But it still suffered extraction threshold instability when using a camera to extract the information. This problem has now been overcome...
The work described in this paper focuses on the design of a low cost, hand held acoustic camera. The novel process of creating the camera has been entirely engineered in ABB Ltd. Even though the creation of the acoustic camera with the use of 3D printing techniques may come at the cost of slightly decreased accuracy of the measurements, when compared with the commercially available solutions, however...
Camera calibration is an important issue in computer vision. In this paper, we propose an improved camera auto-calibration algorithm from sequential images based on VP (vanishing point) and EKF (extended Kalman filter) to determine camera intrinsic parameters. This is the first vanishing point-based auto-calibration algorithm, which only uses a sequence of monocular images as input without any other...
In this paper, we investigate the performance of KinectFusion algorithm for 3D reconstruction using a Kinect sensor. A sensor model is applied to generate depth image to evaluate accuracy of the algorithm. To obtain ground truth of depth image as well as camera pose, we generate depth data based on a CAD model in a simulation program. In the error analysis, deferent types of noise, including depth...
This work tackles the challenging problem of multi-shot person re-identification in realistic unconstrained scenarios. While most previous research within re-identification field is based on single-shot mode due to the constraint of scales of conventional datasets, multi-shot case provides a more natural way for person recognition in surveillance systems. Multiple frames can be easily captured in...
Background subtraction is a popular technique used in accurate foreground extraction with a stationary background. Since most outdoor surveillance videos are taken in complex environments, their "stationary" backgrounds change in some unknown patterns, which make the perfect foreground extraction very difficult. Based on visual background extractor (ViBe) scheme, in this paper we propose...
We present a fast and simple method for solving the perspective-three-point (P3P) problem. The problem is specified as finding the position and orientation of a camera from a single image, showing three points, while the position of the corresponding points in the world is known. Our approach is based on a new geometric parametrization, yielding simpler algebraic terms to compute, compared to all...
In this paper, we present a depth super-resolution framework by fusing depth imaging and stereo vision for high-resolution and high-accuracy depth maps. Depth cameras and stereo vision have their own limitations in some aspects, but their characteristics of range sensing are complementary. Thus, combining both approaches can produce more satisfactory results than either one. Unlike previous fusion...
A comprehensive uncertainty, baseline, and noise analysis in computing 3D points using a recent L1-based triangulation algorithm is presented. This method is shown to be not only faster and more accurate than its main competitor, linear triangulation, but also more stable under noise and baseline changes. A Monte Carlo analysis of covariance and a confidence ellipsoid analysis were performed over...
This paper proposes a novel method of fusing different matching cost for dense depth map recovery in a global optimization framework. Two simple classical cost functions, NCC and SAD, are combined to make a complementary costs fusion, which is robust against noises and weak radiometric difference. We address complicated difficulties as texture-less region and occlusion in a multi-view energy based...
QR codes are the most widely used in two-dimensional barcodes nowadays. Image pre-processing is an important process to achieve QR code image recognition in complex conditions and binarization that directly determines the success or failure of the automatic image recognition technology is a key step in the image pre-processing method. In practical applications, uneven illumination takes a heavy toll...
This paper describes a novel electron-injection based short-wave infrared imager. The first generation of electron-injection imager achieved two orders of magnitude better signal to noise ratio compared with a commercial high-end SWIR camera. In the second generation, detectors are isolated and achieve extremely low dark current, record low noise levels and fast rise times while maintaining the very...
Recently, consumer depth cameras have gained significant popularity due to their affordable cost. However, the limited resolution and quality of the depth map generated by these cameras are still problems for several applications. In this paper, we propose a new algorithm for depth image super resolution using a single depth image as input. We reconstruct the corresponding high resolution depth map...
We propose a new algorithm for blind restoration of very-high-ISO photos. Unlike previous methods that sequentially tackle the problem of noise estimation and image denoising, our approach alternatively refines the estimates of latent image and noise level function (NLF). We rigorously show how the existing low-rank based modeling of image prior can be extended to incorporate spatially inhomogeneous...
This paper addresses the camera identification based on very low bit rate videos with time varying overall noise pattern statistics. First, the overall noise pattern of each frame of the videos is resized to a column vector. It is found that the elements of the resized vectors approximately follow the Laplace distribution. Hence, the second, the fourth and the sixth order statistic moments of each...
Along with the development of the technique of in the large off-axis missile,the helmet mounted display system(HMDS) play the more and more important function in the airplane battle.Currently, the computer vision measurement is popular technology using to calculate line of sight(LOS) In HMDS. We deduce the solution of the non-coplanar perspective-four-point(P4P) problem based on PNP problem in computer...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.