Refine your search
Collections
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Kaewtrakulpong, Pakorn
- Automatic Hard Disk Drive Slider Bar Auditing with Spatial Light Modulator based Imaging System
Abstract Views :160 |
PDF Views:0
Authors
Affiliations
1 Institute of Field Robotics, King Mongkut’s University of Technology Thonburi 126 Pracha-utid Rd., Bangmod, Tungkaru, Bangkok - 10140, TH
2 Department of Mathematics, Faculty of Science, Srinakharinwirot University 114 Sukhumvit 23, Bangkok - 10110, TH
3 Department of Control System and Instrumentation Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi 126 Pracha-utid Rd., Bangmod, Tungkaru, Bangkok - 10140, TH
1 Institute of Field Robotics, King Mongkut’s University of Technology Thonburi 126 Pracha-utid Rd., Bangmod, Tungkaru, Bangkok - 10140, TH
2 Department of Mathematics, Faculty of Science, Srinakharinwirot University 114 Sukhumvit 23, Bangkok - 10110, TH
3 Department of Control System and Instrumentation Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi 126 Pracha-utid Rd., Bangmod, Tungkaru, Bangkok - 10140, TH
Source
Indian Journal of Science and Technology, Vol 8, No 32 (2015), Pagination:Abstract
In Hard Disk Drive (HDD) slider fabrication process, the slider bar auditing is required to verify if the slider bars in the tray are sorted correctly as indicated by the serial numbers printed on sliders. In this paper, we present a machine vision system for automated reading of the serial numbers. Since the sizes of slider bars are very small, an imaging system (CCD camera) with high magnification lens is usually exploited to acquire the slide bar images. For such high magnification vision system, an autofocus module is indispensable. Unlike conventional autofocus modules which perform using mechanical zoom lens, we develop an autofocus module based on Spatial Light Modulator (SLM) where the SLM will act as phase mask filter for focus adjustment. The key contribution of our work is that we perform non-mechanical autofocus approach by adjusting the pixel-based phase mask pattern sending through the SLM. The main advantage of our system is that there is no macromechanical movement part involved in Z-axis focus adjustment. We propose a machine vision algorithm that consists of 3 major steps including coarse localization of slider bar, Autofocus and optical character recognition (OCR). To our best knowledge, our developed system is the first system that uses the SLM based autofocus in machine vision for HDD slider manufacturing. From the experiment, our system can accomplish the task with very high accuracy. By using our system, we can improve the machine vision applications by replacing conventional mechanical zoom lens based autofocus modules that generally cause machine vibrations and increasing maintenance costs related to mechanical movement issues.Keywords
Autofocusing, HDD Slider Bar, Slider Bar Auditing, Spatial Light Modulator- Field Seeding Algorithm for People Counting Using KINECT Depth Image
Abstract Views :132 |
PDF Views:0
Authors
Affiliations
1 School of Electrical Engineering and Informatics, InstitutTeknologi Bandung, ID
2 Department of Mathematics, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Bangkok – 10110, TH
3 Department of Control System and Instrumentation Engineering, King Mongkut’s University of Technology, Thonburi 126 Pracha-utid Road, Bangmod, Tungkaru, Bangkok – 10140, TH
1 School of Electrical Engineering and Informatics, InstitutTeknologi Bandung, ID
2 Department of Mathematics, Faculty of Science, Srinakharinwirot University, 114 Sukhumvit 23, Bangkok – 10110, TH
3 Department of Control System and Instrumentation Engineering, King Mongkut’s University of Technology, Thonburi 126 Pracha-utid Road, Bangmod, Tungkaru, Bangkok – 10140, TH
Source
Indian Journal of Science and Technology, Vol 9, No 48 (2016), Pagination:Abstract
In this work, we present a people counting algorithm using depth images acquired from a KINECT camera that is installed vertically, i.e., pointing toward the floor. Our proposed algorithm is referred to as Field seeding algorithm. The key idea is that first a set of local minimum values are detected from several spatially distributed seed locations. Then, the peoplehead blobs are detected from the binary images generated with regard to the threshold values derived from the local minimum values. The recall, accuracy and F-score of our algorithm are comparable to the current state-of-the-art people counting using KINECT, i.e. Water Filling. However, the main advantage over the previous method is that our algorithm operates deterministically, i.e., no any random number generating function is used.Keywords
Depth Image, Head Detection, People Counting, Vertical Kinect.- Adaptive Focal Length Imaging System using Liquid Crystal Spatial Light Modulator
Abstract Views :151 |
PDF Views:0
Authors
Affiliations
1 Institute of Field Robotics, King Mongkut’s University of Technology Thonburi, 126 Pracha-utid Road, Bangmod, Tungkaru, Bangkok – 10140, TH
2 Department of Mathematics, Srinakharinwirot University, 114 Sukhumvit 23, Bangkok – 10110, TH
3 Department of Control System and Instrumentation Engineering, King Mongkut’s University of Technology, Thonburi 126 Pracha-utid Road, Bangmod, Tungkaru,Bangkok – 10140, TH
1 Institute of Field Robotics, King Mongkut’s University of Technology Thonburi, 126 Pracha-utid Road, Bangmod, Tungkaru, Bangkok – 10140, TH
2 Department of Mathematics, Srinakharinwirot University, 114 Sukhumvit 23, Bangkok – 10110, TH
3 Department of Control System and Instrumentation Engineering, King Mongkut’s University of Technology, Thonburi 126 Pracha-utid Road, Bangmod, Tungkaru,Bangkok – 10140, TH