A new method for increasing accuracy of distance measurement based on single visual camera

Liu, Zewei; Lu, Dongming; Qian, Wei; Ren, Kan; Gu, Guohua; Zhang, Jun; Mao, Chen

doi:10.1007/s11082-019-1786-z

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The focal length here is in pixels, which can be obtained by Zhang's calibration method [28]. According to the principle of pinhole imaging [29], it can be deduced that the ratio of x l to X c and the ratio of y l to Y c are equal to the ratio of f to Z c . The value of X c and Y c can be obtained by formula ( 2):…”

Section: Measurement Methods Based On Traditional Binocular Visionmentioning

confidence: 99%

A measurement system based on internal cooperation of cameras in binocular vision

Zhou

Chu

et al. 2020

Meas. Sci. Technol.

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In this paper, a measurement system based on internal cooperation of cameras in binocular vision is proposed. In terms of the hardware structure, the system is composed of a binocular vision module, a controllable platform and an electronic gradienter, which can be used to collect binocular images and measure horizontal and vertical angles between the binocular vision module and objects. In terms of data processing, a new measurement method based on the cooperation of monocular and binocular vision (MBC) is put forward. Firstly, the depth values of some effective points are obtained according to feature point matching results. Then, a depth propagation algorithm based on MBC is adopted to compute other depth information of the object region. After that, the actual size of unit pixels is computed on the basis of the corresponding disparity value, and it is corrected according to the horizontal and vertical angles. Finally, accurate size measurement of the object is achieved by accumulating the number of pixels. Experimental results show that the proposed system can achieve more accurate measurement results compared to the traditional binocular vision measurement method. For all the experimental objects, the absolute relative measurement errors with our method are all lower than 3.5%.

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Section: Measurement Methods Based On Traditional Binocular Visionmentioning

confidence: 99%

A measurement system based on internal cooperation of cameras in binocular vision

Zhou

Chu

et al. 2020

Meas. Sci. Technol.

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An indoor location algorithm based on Kalman filter fusion of ultra-wide band and inertial measurement unit

Hao

Dang

2019

AIP Advances

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Indoor positioning technology has been widely used in today’s life, but due to the influence of multipath effect, the positioning signal is attenuated or even interrupted seriously, resulting in obvious reduction or even failure of positioning accuracy. Therefore, the emerging multi-sensor joint positioning has become the general trend of the development of positioning technology, in which Ultra-Wide Band (UWB) and Inertial Measurement Unit (IMU) have their own features in positioning and navigation. So this paper combines the advantages of UWB and IMU to achieve accurate positioning in complex environment. Firstly, the signal transmission law in complex environment is obtained by distinguishing Line of Sight (LOS) from NLOS (Non Line of Sight) environment. Secondly, the maximum likelihood estimation algorithm is used to eliminate the influence of NLOS on the transmitted signal, and then the extended Kalman filter information fusion strategy is used. The ranging information of UWB and the angle information of IMU are fused to realize the accurate positioning of UWB in complex environment. Finally, the experimental results show that the performance of the joint positioning proposed in this paper is obviously better than that of a single sensor compared with single UWB and single IMU positioning. It provides more solutions for accurate indoor positioning of multi-sensor fusion.

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Image-Based Distance Estimation of a Target from a Camera using Color Checker Chart

Kamath,

Kurian,

K. R

et al. 2024

2024 International Conference on Intelligent and Innovative Technologies in Computing, Electrical and Electronics (IITCEE)

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A new method for increasing accuracy of distance measurement based on single visual camera

Cited by 4 publications

References 5 publications

A measurement system based on internal cooperation of cameras in binocular vision

A measurement system based on internal cooperation of cameras in binocular vision

An indoor location algorithm based on Kalman filter fusion of ultra-wide band and inertial measurement unit

Image-Based Distance Estimation of a Target from a Camera using Color Checker Chart

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