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We propose a new method that extends the capability of shape-from-focus (SFF) to estimate the depth profile of 3-D objects in the presence of structure-dependent pixel motion. Existing SFF techniques work under the constraint that there is no parallax in the captured stack of frames. However, in off-the-shelf cameras, there can be appreciable pixel motion among the observations when there is relative...
Depth range cameras like the plenoptic camera are a promising solution for 3DTV. The use of plenoptic cameras for 3DTV has some benefits with respect to 3D capture systems based on camera arrays since there is no need of geometric and color calibration or frame synchronization. This paper presents a new technique to simultaneously recover the 3D depth and all-in-focus images from a plenoptic camera...
Plenoptic cameras are able to acquire multi-view content that can be displayed on auto-stereoscopic displays. Depth maps can be generated from the set of multiple views. As it is a single lens system, very often the question arises whether this system is suitable for 3D or depth measurement. The underlying thought is that the precision with which it is able to generate depth maps is limited by the...
Dense stereo disparity map is an image indicative of the distances to the objects in the view field, constructed from the binocular stereo cameras, which can be used as robotic vision sensor etc. In order to determine the disparity, pixel correspondence between the right and left images needs to be found. A simple camera pose to keep the lens axes of two cameras parallel makes the stereo matching...
This study presents a robust face tracking method based on active stereo camera system. This system is a stereo vision system that can hold its gaze point on the face of the visual target during tracking it. When the system fixes its gaze point on the face exactly, the face can be discriminated from the background by binocular disparity. To keep the gaze point of the system on the face of a moving...
Stereo correspondence algorithms are computationally complex making real-time performance difficult on conventional hardware. Large disparity ranges are key to depth accuracy but increase the computation time: recently, we have achieved a disparity range of 128 enabling 1% depth accuracy in a system processing high resolution (1 Mpixel) images at 30 fps. The pixel throughput rate requires careful...
In this paper, we looked around the application of the lens distortion correction and 3D posture correction algorithm which is preferentially to be performed for three dimensional information extraction and visibility of the object material using stereo camera. Regarding the part of lens distortion correction, distortion due to the spherical aberration of the lens was corrected by obtaining the pattern...
Duplicating the full dynamic capabilities of the human eye-brain combination is a difficult task but an important goal because of the wide application for a system which can acquire accurate 3D models of a scene in real time. Such a system must be able to correct images to remove lens distortion and camera misalignments from high resolution images at video frame rates 30 fps or better. The images...
An effect of the toed-in camera configuration is keystone distortion, which causes vertical and horizontal parallax in the stereoscopic image. However if the stereoscopic image captured by the toed-in camera system with fish-eye lens is displayed on mobile device, it is uncomfortable to view because the horizontal parallax contain horizontal parallax distortion occurred by the wide field of view of...
This paper presents a stereo vision processor with the form of ASIC that achieves enhanced quality depth maps and real-time performance. Our vision processor can be used broadly in practical applications. To improve depth map quality, pre- and post-processing units are adopted, and SFRs (special function registers) are assigned to vision parameters for controllable quality. To meet real-time requirements,...
We examine the challenges to underwater vision that are caused by light refracting through both hemispherical and planar pressure housing interfaces. As light travels through water, into a pressure housing, and finally into a camera, it is bent according to Snell's law, rendering the typically-used perspective camera model invalid. Through numerical simulation, we examine the degree to which the incorrect...
For automotive applications, 3D perception of the car's surroundings is crucial, both for driver assistance and for safety systems. In addition, a large field of view is required for future applications such as intersection assistance. A popular option to obtain 3D measurements and detect objects is to use two cameras (stereo vision). Applications based on object detection range from Adaptive Cruise...
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