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In this paper, we propose an automatic shark detection method in deep sea by light section method, in order to realize shark observation with much less energy. This method detects sharks on the basis of cross-sectional shape obtained by light section method. To analyze the performance of the proposed method, experiments at aquariums was conducted. It was observed that detection accuracy became high...
With the growing number of automobiles, it brings both the problem of difficult parking and the increasing traffic accidents in parking process. As one of the important issue in the parking assist system, the detection method of nearest point from the obstacle to automobile body is studied. On the basis of analyzing and comparing several methods of automobile distance detection, a nearest point detection...
This paper mainly studies the autonomous navigation method for the constellation. Based on the measurements of inter-satellite ranging and direction, a federated filter algorithm is presented. Then, to redue the error caused by the constellation rotation, a camera is applied in observations. Ultimately, the feasibility of reducing the number of cameras observations is discussed. The simulation results...
When exposed to ultrasound, microbubbles (MBs) deflate [1]. This occurs due to exchange of the MB filling gas with the gas of its environment, thus implying changes in its gas composition. Moreover, recent studies showed that gas composition affects the subharmonic (SH) response of phospholipid-coated contrast agents [2] [3]. In this work we investigated the SH emission from single MBs and the impact...
In order to detect the illegal vehicle jumping in the crowded traffic flow by the car DVR, an algorithm for real-time ranging of the car in front using license plate characteristics is proposed with the monocular vision technology. Firstly, the geometric relationship model of the camera is studied, and then a kind of real-time ranging algorithm with the monocular vision is put forward combining the...
A procedure to calibrate the relative position and orientation (extrinsic parameters) between a Time of Flight (ToF) camera and an RGB camera is presented. The proposed approach is particularly suited for ToF cameras characterized by very low resolution and a limited field of view. The presented experimental set-up is conceived to facilitate feature detection using both the ToF and RGB cameras. Three...
In this paper, we proposed an indirect method to measure the distance of an object accurately by single visual cameras using triangulation. The object can be seen as the third point of a triangle with two known sides and one known angle. Distance to object can be determined indirectly on the base of known sides and angle, rather than being measured directly. It would be very useful in case there is...
Keeping vehicle safety distance through early warning for road vehicles is very important and it could greatly reduce the occurrence of road traffic accidents. This article introduce a vehicle distance detection method based on monocular vision. Nowadays, due to the progress of deep neural network, object detection technology has reached a higher level, and its detection accuracy (recognition rate,...
A new vision-based approach to accomplish automatic detection and speed measuring of vehicles is proposed in this paper. In the proposed method, a cascade classifier, based on Haar features, is trained on frontal view of vehicles and deployed for vehicle detection. A fast and accurate foreground segmentation algorithm is proposed to distinguish moving vehicles from the background and prune detection...
The article presents new results achieved during researching the distance measuring method that is a part of Depth From Defocus techniques. The method has been developed to determine the shape of the flaccid diaphragm used in the Ventricular Assist Device (VAD). The shape is determined on the basis of distance measured between the CCD sensor plate of the camera and objects (markers) located on the...
Relative localization is a core problem for swarm robotics since each swarm node must determine where neighboring robots are located to accomplish cooperative tasks such as formation control. In this paper we present a system that performs relative localization between a stationary marker and a flying robot in real-time. Relative distances are obtained using ultra-wide band radio, while a low-cost...
As the research in ear biometrics grows, there is a need to have a publicly available ear images database for researchers to test and validate their methods. There are many available ear databases captured in visible light domain. However, images in those databases are mostly acquired in a controlled environment, not in naturally illuminated environments. Up to the point of writing, there is no thermalbased...
The capability of automated vehicles with intelligent on-board systems aimed at improving traffic safety has been in constant advance. This paper proposes an integrated module of lane and vehicle detection for a forward collision warning system that can be embedded in an autonomous driving system operating in real time. Integration of lane and vehicle detection provides more precise information for...
Time-of-Flight (ToF) camera has become an attractive source of applications in location-based services, autonomous navigation, object localization for robotic manipulation, ego-motion estimation, etc. Besides, these services demand centimeter level accuracy to provide the required services. Though ToF cameras can provide high accuracy in location-based services with high frame rates (approx. 30 fps),...
A distance measurement method for a single-camera condition is proposed. The aim is to implement a way to find the distance of an object in front of the imaging system in indoor environment. In this method, the first step is to extract the appropriate vertical floor line from the snapshots sequence. Moreover, the line passing through the base side of the object is found simultaneously with the floor...
This paper considers the problem of target handoff between Unmanned Aerial Vehicles (UAVs) in a GPS denied environment, and focuses on the design and evaluation of an estimation strategy for determining the relative pose of the aircraft. The estimation approach presented in this paper has three distinct components that act in concert to achieve the overall objective. First, a novel cooperative control...
Vision systems are becoming popular as a method of gathering information and stimuli from a robot's environment. The goal of this paper is to implement an underwater distance ranging system using a stereo vision system. Target tracking is based on the color of the targets. The ranging algorithm was designed so that it can range targets up to 2 meters away with a minimum accuracy of 90%. An algorithm...
Measuring distances accurately can be costly. To overcome complexity and cost of distance measurement equipment modified monocular optical system is proposed which uses only commonly available hardware. Pattern is printed on the marker to improve distance measurement accuracy. Results of simulations of proposed system show two orders of magnitude possible improvement in measurement precision.
In this study, we propose a measurement system consists of two pairs of multiple cameras mounted on a pan-tilt unit and a landmark installed on a target side. The purpose of the proposed system is to measure relative position and heading angle of a vessel to a target at a close distance, in order to reduce collision risks by automation of vessel positioning that requires high measurement accuracy...
This paper describes the highly accurate stereo-based measuring and tracking system that measures the distance to a specific landmark installed on a target side. Our goal is to obtain the accurate distance from a vessel to a target such as a wharf for precise vessel control. In order to achieve this, the system should have high distance measurement accuracy and the robustness against waving motion...
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