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In multiview video applications, view synthesis is a computationally intensive task that needs to be done correctly and efficiently in order to deliver a seamless user experience. In order to provide fast and efficient view synthesis, in this paper, we present a cloud-based implementation that will be especially beneficial to mobile users whose devices may not be powerful enough for high quality view...
Structured light 3D camera systems are composed of a commercial video projector and a machine vision camera. High scan speed structured light 3D camera systems, suffers synchronization problems due to a mismatch in the projector screen refresh rate, and camera capturing speed. Commercial video projectors project with fixed refresh rate, frame rate of machine vision camera's increase or decrease with...
This paper proposes a method of embedding AR (augmented reality) markers in a high-speed video sequence so that they are imperceptible to human eyes. The embedded markers appear for very short periods and keep changing their positions at lightning speed. By carefully designing the timings of marker display, a camera with a sufficiently short exposure time running at any frame rate is able to detect...
Structured lighting is a computer vision technique that projects illumination patterns onto the scene to facilitate feature extraction from the captured images. The use of lowcost cameras is avoided not only due to their low image quality but mostly due to the lack of a synchronization mechanism for the illuminators. In this paper we propose a method to synchronize low-cost cameras and illuminators...
This paper investigates respiration activity data obtained simultaneously from more than ten persons while they were attending a live concert. Physiological activity in a group setting is attracting increased attention since it was suggested that it differs from data obtained individually with recorded stimuli. To overcome the difficulty in obtaining physiological data in a real situation, we developed...
The prevalence of camera-equipped smartphones and optoelectronic displays opens up a novel framework for wireless communication-optical camera communication. With displays as transmitters and cameras as receivers, a reliable optical communication link is established. In practice, the frame synchronization between transmitters and receivers is an inevitable challenge confronted in this new communication...
In this paper, we study the problem of Cross-View Person Identification (CVPI), which aims at identifying the same person from temporally synchronized videos taken by different wearable cameras. Our basic idea is to utilize the human motion consistency for CVPI, where human motion can be computed by optical flow. However, optical flow is view-variant - the same person's optical flow in different videos...
We describe a time-of-arrival-(ToA-) based localization system for smartphones. In this system, the transmitter emits modulated light-emitting diode (LED) light and sound waves, then the smartphone catches them. The smartphone measures the time of flight of sound waves and localizes its position using multilateration. The LED light is used for visible light communication, which also conveys the time...
We present new methods of simultaneously estimating camera geometry and time shift from video sequences from multiple unsynchronized cameras. Algorithms for simultaneous computation of a fundamental matrix or a homography with unknown time shift between images are developed. Our methods use minimal correspondence sets (eight for fundamental matrix and four and a half for homography) and therefore...
This paper addresses the problem of spatio-temporal alignment of multiple video sequences. We identify and tackle a novel scenario of this problem referred to as Nonoverlapping Sequences (NOS). NOS are captured by multiple freely panning handheld cameras whose field of views (FOV) might have no direct spatial overlap. With the popularity of mobile sensors, NOS rise when multiple cooperative users...
This paper proposes a method for reconstructing 3D ball trajectories by using multiple temporally and geometrically uncalibrated cameras. To use cameras to measure the trajectory of a fast-moving object, such as a ball thrown by a pitcher, the cameras must be temporally synchronized and their position and orientation should be calibrated. In some cases, these conditions cannot be met, e.g., one cannot...
Smartphones have become the de-facto capture devices for everyday photography. Unlike traditional digital cameras, smartphones are versatile devices with auxiliary sensors, processing power, and networking capabilities. In this work, we harness the communication capabilities of smartphones and present a synchronous/co-ordinated multi-camera capture system. Synchronous capture is important for many...
The advanced use and the evolution of technologies regarding autonomous Unmanned Aerial Vehicle (UAV) have increased the availability of information and resources to perceive the environment, allowing its application in various activities, such as inspection and military. However, the intelligence level of these kind of systems needs to be improved in order to fit them in modern tasks. In this sense,...
This paper presents a single-chip trinocular disparity estimation processor, capable of computing in real-time up to 2048×1080 resolution depth maps at 32fps with up to 256-pixel disparity range using two/three CMOS camera sensors. The most important feature of the presented design is that the chip is based on a trinocular adaptive window matching process that requires very limited on-chip memory,...
High-speed cameras are expanding into science laboratories in many disciplines. For example, they can be used for monitoring of the impact testing course, widely spread in evaluation of materials. Usually, they exhibit a slight delay between the trigger pulse was applied and the recording was started. For many applications, this delay may be critical. The authors of this paper have faced two problems:...
In this study, we investigate the feasibility of detecting small intruder aircraft through camera images obtained onboard a small unmanned aircraft. The research group (Small Unmanned Aerial Vehicle Laboratory) from NASA Langley Research Center flew a set of missions with their small UAS (sUAS) where one of those vehicles is outfitted with three 4K resolution cameras located at the tips of the wings...
The SyncBoard is a reconfigurable sensor timing board that accurately records the Time of Validity (TOV) from sensors, while acting as a protocol conversion tool. It is intended to be usable by people without expertise in hardware development. To allow accurate timing, the SyncBoard has a highperformance microcontroller with a 32-bit timer clock running at a maximum of 100 MHz. By capturing the TOV...
Time-of-Flight 3D imaging systems are promising transceivers for image sensor based optical communication. 3D sensing based on Time-of-Flight is the most miniaturized depth imaging technology available and is currently being integrated into consumer electronics such as smart phones. Optical line-of-sight communication with a depth imaging system offers complete location-awareness of the communication...
Machinima is which use real-time graphics rendering platform game engine to create animated videos or films. Traditional methods of machinima filming are stand-alone methods that using artificial intelligence scripting to implement the plot. However, massive script writing work of artificial intelligence will cost a IoT of manpower and resources. This paper proposes a method based on network game...
User Generated Videos are contents created by heterogeneous users around an event. Each user films the event with his point of view, and according to his limitations. In this scenario, it is impossible to guarantee that all the videos will be stable, focused on a point of the event or other characteristics that turn the automatic video synchronization process possible. Focused on this scenario we...
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