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This paper presents GIMME (General Image Multiview Manipulation Engine), a highly flexible reconfigurable stand-alone mobile two-camera vision platform with stereo-vision capability. GIMME relies on reconfigurable hard-ware (FPGA) to perform application-specific low to medium-level image-processing at video-rate. The Qseven-extension enables additional processing power. Thanks to its compact design,...
Visual Sensor Networks (VSNs) are networks which generate two dimensional data. The major difference between VSN and ordinary sensor network is the large amount of data. In VSN, a large number of camera nodes form a distributed system which can be deployed in many potential applications. In this paper we present a model of the physical parameters of a visual sensor network to track large birds, such...
Georegistration is the assignment of 3-D coordinates to the pixels of an image. It is necessary for aligning imagery with map data, fusing images from different sensors, and geolocating moving objects. Georegistration requires recovery of the exterior camera orientation or pose—that is, position and attitude—for every image in the motion imagery sequence, and often the recovery of the intrinsic camera...
Parallel phase-shifting digital holography (PPSDH) has been introduced. Movies of high-speed 3-D imaging and those of high-speed phase imaging obtained by PPSDH using a high-speed camera will be demonstrated at the presentation. PPSDH will contribute for 3-D measurement of moving object in such the applications as biological microscope, particle and flow measurement, and so on. This study was partially...
In typical image sensors the spectral sensitivity of color channels is fixed. The illumination spectrum in natural scenes can vary to a great extent. This leads to an unbalanced response in color channels and hence a reduction in dynamic range. We propose a new method to adjust the relative sensitivity of color channels based on multi-exposure frame combination. Instead of a single long exposure we...
Obtaining the distance of an object using image capture devices is a convenient and practical approach for intelligent 3D technology. “Depth from defocus” is one of the recovery methods, which has the advantage of using only a single static viewpoint. In this paper, a new method is proposed to represent the defocus blur amount by the spectral energy of the point spread function for depth recovery...
Scannerless 3D-Time-of-Flight image sensors serve to acquire three-dimensional (3D) information of objects in a scene. This contribution is devoted to modeling and calibration of scannerless 3D-Time-of-Flight image sensors based on pulse modulation. After a short description we introduce a 3D image sensor model that includes system nonlinearities due to nonideal photodetectors and signal processing...
Embedded systems have limited processing power, memory and energy. When camera sensors are added to an embedded system, the problem of limited resources becomes even more pronounced. In this paper, we introduce two methodologies to increase the energy-efficiency and battery-life of an embedded smart camera by hardware-level operations when performing object detection and tracking. The CITRIC platform...
The frame rate of commercial off-the-shelf industrial cameras is breaking the threshold of 1000 frames-per-second, the sample rate required in high performance motion control systems. On the one hand, it enables computer vision as a cost-effective feedback source; On the other hand, it imposes multiple challenges on the vision processing system. The authors have designed and implemented an FPGA-based...
We demonstrate high-speed parallel phase-shifting digital holography capable of three-dimensional measurement of a dynamically moving object. We constructed the recording system by using a quarter-wave plate and a high-speed polarization-imaging camera. Moving pictures of two vibrating elastic bands located on different depth plane were clearly and individually reconstructed by the technique.
Embedded smart cameras have limited processing power, memory and energy. In this paper, we introduce two methodologies to increase the energy-efficiency and the battery-life of an embedded smart camera by hardware-level operations when performing foreground object detection. We use the CITRIC platform as our embedded smart camera. We first perform down-sampling at hardware level on the micro-controller...
Scanners that are used by high-resolution imaging satellites are usually push-broom scanners with linear image sensors. The linear sensors are particularly sensitive to the changing of attitude, which will cause considerable image distortions. As a result, the influence of the attitude error must be taken into consideration in the simulation of the whole image chain of remote sensing in space. Traditionally,...
We introduce a scheme for the production of LDV (Layered Depth Video) content, based on capturing from a hybrid camera system, consisting of two time of flight and five CCD cameras and introduce a post production step, based on Grab - Cut segmentation, which significantly improves the quality of the end result. The proposed improvement step can be done fully automatically, based on initialization...
Phase-shifted sinusoids are commonly used as projection patterns in structured light systems consisting of projectors and cameras. They require few image captures per 3D reconstruction and have low decoding complexity. Recently, structured light systems with a projector and a pair of stereo cameras have been used in order to overcome the traditional phase discontinuity problem and allow for the reconstruction...
In high quality imaging even tiny distortions as small as a single pixel are visible and can not be accepted. Although the production quality of CMOS image sensors is very high, for reasonable yields we still need to accept some defect pixels and clusters of defects in large image sensors. In this paper we will compare compensation algorithms for raw image sensor data. We propose a new approach based...
Recently, several method have been proposed to capture 3D shapes of a moving object at a high frame rate. One of promising approach to reconstruct a 3D shape is a projector-camera system that projects structured light pattern. One of the problem of this approach is that it has difficulty to obtain texture simultaneously because the texture is interfered by the illumination from the projector. The...
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 traffic surveillance applications, automatic methods to detect abrupt changes in a traffic scene are highly desirable. A robust method is introduced for camera based assessment of scene changes based on the dynamics derived from the detected objects in the scene. The approach needs a calibrated and oriented camera but no further contextual knowledge and works even with highly fragmented trajectories...
Today, consumer cameras produce photographs with tens of millions of pixels. The recent trend in image sensor resolution seems to suggest that we will soon have cameras with billions of pixels. However, the resolution of any camera is fundamentally limited by geometric aberrations. We derive a scaling law that shows that, by using computations to correct for aberrations, we can create cameras with...
This paper considers the deployment problem for mobile visual sensor networks equipped with omni-directional communication capability in a non-convex environment. The performance of the visual sensor is assumed to depend not only on the distance but also on the orientation from the sensor to the target. A gradient-based distributed deployment algorithms is designed to maximize the joint detection...
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