distance measurement





Distance measurement model based on RSSI in WSN
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The relationship between RSSI (Received Signal Strength Indication) values and distance is the foundation and the key of ranging and positioning technologies in wireless sensor networks. Log-normal shadowing model (LNSM), as a more general signal propagation

An ultrasonic sensor for distance measurement in automotive applications
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This paper describes an ultrasonic sensor that is able to measure the distance from the ground of selected points of a motor vehicle. The sensor is based on the measurement of the time of flight of an ultrasonic pulse, which is reflected by the ground. A constrained

Using ultrasonic and infrared sensors for distance measurement
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The amplitude response of infrared (IR) sensors depends on the reflectance properties of the target. Therefore, in order to use IR sensor for measuring distances accurately, prior knowledge of the surface must be known. This paper describes the Phong Illumination

Distance measurement of an object or obstacle by ultrasound sensors using P89C51RD2
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Distance measurement of an object in the path of a person, equipment, or a vehicle, stationary or moving is used in a large number of applications such as robotic movement control, vehicle control, blind mans walking stick, medical applications, etc. Measurement

Object distance measurement by stereo vision
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The 3D camera consists of two cameras of parallel optical axes and separated horizontally from each other by a small distance and these two cameras are combined together in a single frame. The 3D camera is used to produce two stereoscopic pictures for a given object

Real-time omni-directional distance measurement with active panoramic vision
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Autonomous navigation of mobile robot requires a ranging system for measurement of distance to environmental objects. It is obvious that the wider and the faster distance measurement gives a mobile robot more freedom in trajectory planning and control. The

Distance measurement using a single camera with a rotating mirror
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A new distance measurement method with the use of a single camera and a rotating mirror is presented. A camera in front of a rotating mirror acquires a sequence of reflected images, from which distance information is extracted. The distance measurement is based on the

Distance measurement via using of ultrasonic sensor
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Journal of Automation and Control, 201 Vol. No. 71-74 Available online at http://pubs.sciepub .com/automation/3/3/6 Science and Education Publishing DOI:10.12691/automation-3-3-6 Distance Measurement via Using of Ultrasonic Sensor Michal Kelemen *, Ivan

Distance measurement using single non-metric CCD camera
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A novel measuring system based on a single non-metric CCD camera and a laser projector is proposed in this paper for measuring distance of a remote object. The setup of the measuring system is relatively easy, in which the laser pointer is positioned beside the CCD

Practical experience with distance measurement based on single visual camera
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The paper deals with the problem of distance measurement of stationary target by single visual camera in laboratory conditions. The paper describes the practical experiments performed in order to estimate the distance of a target using visual odometry. For the

Indoor inter-robot distance measurement in collaborative systems
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This paper focuses on the problem of autonomous distance calculation between multiple mobile robots in collaborative systems. We propose and discuss two distinct methods, specifically developed under important design and functional constraints, such as the speed

Choosing appropriate distance measurement in digital image segmentation
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In this paper we show how we can take advantage of using different distance functions in image processing applications. The proposed methods are based on well-known algorithms that use distance measurement . We focus on multidimensional image indexing and

Distance measurement of object by ultrasonic sensor HC-SR04
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There are several ways to measure distance without contact. The selection of distance measurement sensor in order to apply it in any application is very important to avoid any invalid experimental results. Measurement using ultrasonic sensor is cheapest among

Investigation on the influence of the incidence angle on the reflectorless distance measurement of a terrestrial laser scanner
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Although the influence of incidence angle (IA) is one of the known error influence of terrestrial laser scanners (TLS), it is not taken into account in the evaluation of TLS-data. In this paper fundamental question is discussed, how the IA influences the TLS-distances, it is

Distance measurement system using binocular stereo vision approach
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Stereoscopy is a technique used for recording and representing stereoscopic (3D) images. It can create an illusion of depth using two pictures taken at two or more slightly different positions. There are two possible way of taking stereoscopic pictures: by using special two

Quantification and description of distance measurement errors of a time-of-flight camera
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This study is concerned with the accuracy of distance measurements made by a time-of- flight camera, also known as a range camera. Such a camera records intensity and distance for each pixel in the image, effectively recording a three-dimensional greyscale image at

Distance measurement for self-driving cars using stereo camera
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Self-driving cars reduce human error and can accomplish various missions to help people in different fields. They have become one of the main interests in automotive research and development, both in the industry and academia. However, many challenges are

Analysis of distance measurement system of leading vehicle
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Based on the digital image processing theory, a new method of measuring the leading vehicle distance was proposed. The input image using the method of edge enhancement and morphological transformation was established, so the edges of objects were enhanced

Experimental comparison of four different CMOS pixel architectures used in indirect time-of-flight distance measurement sensors
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CMOS based indirect time-of-flight (ToF) rangers were designed, fabricated and characterised. The measured results are presented here for their direct comparison. Sharing a very similar, yet case optimised readout circuitry in each case, three fabricated CMOS

The theory of dispersion applied to electro-optical distance measurement and angle measurement
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SUMMARY A general expression is derived for the group propagation time in a dispersive inhomogeneous medium. This expression is more exact than the usual concept of the group refraction index. The above mentioned expression is applied to an extension of the theory of





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