Next Article in Journal
Partial Purification and Characterization of a Thermostable β-Mannanase from Aspergillus foetidus
Next Article in Special Issue
Study of Three-Dimensional Image Brightness Loss in Stereoscopy
Previous Article in Journal
Chemical Modification of Poly(Vinyl Alcohol) in Water
Previous Article in Special Issue
Design of the Secondary Optical Elements for Concentrated Photovoltaic Units with Fresnel Lenses
Article Menu

Export Article

Open AccessArticle
Appl. Sci. 2015, 5(4), 851-880;

Visual Recognition and Its Application to Robot Arm Control

Department of Communications, Navigation & Control Engineering, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 20224, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Wen-Hsiang Hsieh
Received: 30 July 2015 / Revised: 29 September 2015 / Accepted: 9 October 2015 / Published: 20 October 2015


This paper presents an application of optical word recognition and fuzzy control to a smartphone automatic test system. The system consists of a robot arm and two webcams. After the words from the control panel that represent commands are recognized by the robot system, the robot arm performs the corresponding actions to test the smartphone. One of the webcams is utilized to capture commands on the screen of the control panel, the other to recognize the words on the screen of the tested smartphone. The method of image processing is based on the Red-Green-Blue (RGB) and Hue-Saturation-Luminance (HSL) color spaces to reduce the influence of light. Fuzzy theory is used in the robot arm’s position control. The Optical Character Recognition (OCR) technique is applied to the word recognition, and the recognition results are then checked by a dictionary process to increase the recognition accuracy. The camera which is used to recognize the tested smartphone also provides object coordinates to the fuzzy controller, then the robot arm moves to the desired positions and presses the desired buttons. The proposed control scheme allows the robot arm to perform different assigned test functions successfully. View Full-Text
Keywords: fuzzy control; image processing; robot arm; optical character recognition fuzzy control; image processing; robot arm; optical character recognition

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Juang, J.-G.; Tsai, Y.-J.; Fan, Y.-W. Visual Recognition and Its Application to Robot Arm Control. Appl. Sci. 2015, 5, 851-880.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top