Project: IEEE P802.15 IG VAT - PowerPoint Presentation

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Project: IEEE P802.15 IG VATSubmission Title: Distance error correction in OCC based indoor positioning. Date Submitted: November 2019 Source: Md. Shahjalal, Moh. Khalid Hasan, and Yeong Min Jang [Kookmin University].Contact: +82-2-910-5068 E-Mail: yjang@kookmin.ac.kr Re:Abstract: Developing corrected direct distance formula for optical camera communication.Purpose: To achieve less positioning error in OCC based indoor mobile robot positioning.Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

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Applications of OCC LEDsIndoor smart lighting systemIndividual lighting device control systemDimming controlColor control and emotional controlIoT and Internet of lightsPersonal lightingNavigation and LocalizationDCN 15-19-0541-00-0vat

What is Optical Camera Communication (OCC) ? OCC is -modulating an LED light with data bitscamera receives the data bits then decodes the bits and extracts the data by frame by frame processing [1]DCN 15-19-0541-00-0vat

OCC in indoor positioningIndoor positioning using OCC is a challenging research area as GPS technology does not work in indoor environment [2].Nowadays LED lights are widely used in almost every indoor lighting environment. Utilizing this existing infrastructure for localization and then navigation purpose is an efficient idea [3].Figure 1. Indoor positioning sceneriosDCN 15-19-0541-00-0vat

OCC in indoor positioningCamera mounted MR should have self-processing unit which includes data and image processing. Database will store the previous positioning informationFigure 2. Mobile robot processing unit.DCN 15-19-0541-00-0vat

Corrected distance calculationFigure 4. The shape of a circular LED changes to eclipse with the increase of incidence angle Figure 4 depicts that for a circular LED how it changes to eclipse with the increase of incidence angle. We can modify the previous equation as follows: actual area of reference LED changes according to how far horizontally the receiver is. By this method of consideration, the positioning accuracy can be improved.DCN 15-19-0541-00-0vat

Corrected distance calculationFigure 5. Distance measurement from camera to LED. We arranged rectangular LED of size 0.25 m2 to transmit coordinate information.When there are multiple LEDs inside.camera FOV it compares between the covered pixel areas of that detected LEDs. Then DIPU of MR takes only larger area to get floor position of that LED.LEDs of same size at a distance 336cm have smaller area than that at a distance of 190cm in the image sensor.DCN 15-19-0541-00-0vat

[1] M. Z. Chowdhury, M. T. Hossan, A. Islam, and Y. M. Jang, “A comparative survey of optical wireless technologies: architectures and applications,” IEEE Access, vol. 6, pp. 9819-9840, January 2018.[2] M. Shahjalal et al., “An implementation approach and performance analysis of image sensor based multilateral indoor localization and navigation system,” Wireless Communications and Mobile Computing, vol. 2018, pp. 13, October 2018.[3] M. T. Hossan et al., “A new vehicle localization scheme based on combined optical camera communication and photogrammetry,” Mobile Information Systems, vol. 2018, no. 2018, pp. 1-1, March 2018.References