Keng T. Tan

Pervasive 2D Barcodes for Camera Phone Applications

In a previous study, we evaluated six 2D barcodes using eight criteria for standardization potential: omnidirectional symbol reading, support for low-resolution cameras, reading robustness under different lighting conditions, barcode reading distance, error correction capability, security, support for multiple character sets, and data capacity. We also considered the fidelity of the camera phones captured image as a metric for gauging reading reliability. Here, we review the six 2D barcodes and then use an additional metric - a first-read rate - to quantitatively verify our earlier results and better gauge reading reliability.

Novel colour selection scheme for 2D barcode

The use of colours in 2D barcodes is challenging. This is even more so in barcodes for mobile devices. Although 2D barcodes are fast becoming the ubiquitous tool for mobile computing, most implementations considered monochromatic 2D barcodes. A few colour 2D barcodes are emerging but these implementations only utilises a limited number of colours. In this paper, we present the challenges faced by the use of colours in 2D barcodes for mobile devices. We also introduce a novel colour selection scheme for 2D barcode, which is implemented in our novel colour 2D barcode - the MMCCTM. Our novel selection scheme resulted in a robust 2D barcode that can use more colours than existing colour 2D barcodes for mobile devices.

First read rate analysis of 2D-barcodes for camera phone applications as a ubiquitous computing tool.

This paper presents a detailed study on the first read rate (FRR) of seven 2D-barcodes currently used for camera phone applications. The study revealed a few surprising observations. Through our analysis, we identified three key factors to improve the robustness of 2D-barcode reading, the range of the reading distance and the stability of the readers. This will contribute to the widespread use of 2D-barcode mobile technology as a ubiquitous computing tool.

The Use of Border in Colour 2D Barcode

In recent years, a trend has emerged in the use of colour to increase the data capacity of the 2D barcode. However the decoding of such colour barcode can be challenging in a mobile environment due to blurring effect that is commonly found in images captured by camera mobile phone. Blurring affects the synchronisation between the cells. It also causes the colour value of the cell to be wrongly interpreted. Hence, this paper proposes the use of border to improve the synchronisation and decoding. Three different types of border and the choice of its width will be investigated.

Performance of mobile camera on colour 2D barcode

In recent years, colour 2D barcodes have emerged to increase the data capacity of the 2D barcode. Similarly, camera-equipped mobile phones have became more popular and their camera could act as an input device for a barcode decoder. In this paper, three Windows Mobile (WM) operated mobile phones are used to test their camera performance in reading the colour 2D barcodes. From the results, recommendations are put forward to those who are developing colour 2D barcode reader for mobile phones.

Barcodes for Mobile Devices: Index

From inventory management in stores to automotive part tracking in assembly plants, barcodes are one of the most prevalent automatic identification and data capture technologies. This book provides a complete introduction to barcodes for mobile devices, presenting the most relevant and up-to-date information previously unavailable elsewhere or difficult to obtain. The focus throughout is on recent developments and two-dimensional (2D) barcodes, including the research and development steps towards colour barcodes for mobile devices, helping readers to develop their own barcodes. The authors also provide design details for their own novel colour 2D barcode: the Mobile MultiColour Composite (MMCC) barcode, plus coverage of RFID technology and one-dimensional barcodes. This book is ideal for professional developers of barcodes for mobile devices who need the latest technical details and information on how to develop barcodes. It is also a useful reference for graduate students researching the field of barcode technology and mobile computing.

Barcodes for Mobile Devices: Frontmatter

From inventory management in stores to automotive part tracking in assembly plants, barcodes are one of the most prevalent automatic identification and data capture technologies. This book provides a complete introduction to barcodes for mobile devices, presenting the most relevant and up-to-date information previously unavailable elsewhere or difficult to obtain. The focus throughout is on recent developments and two-dimensional (2D) barcodes, including the research and development steps towards colour barcodes for mobile devices, helping readers to develop their own barcodes. The authors also provide design details for their own novel colour 2D barcode: the Mobile MultiColour Composite (MMCC) barcode, plus coverage of RFID technology and one-dimensional barcodes. This book is ideal for professional developers of barcodes for mobile devices who need the latest technical details and information on how to develop barcodes. It is also a useful reference for graduate students researching the field of barcode technology and mobile computing.

An automated sampling soil reduction-oxygenation RF sensor network for cereal crop management

There is a need for cost effective tools and data collection methods for field measurements: to increase both productivity and volumes of collected data in the quest for enhanced understanding and management of environmental systems. To such end, we explore the various RF technologies that may be combined into a cost effective soil redox sensor network, discuss the merits of each as a component of said network, describe a prototype soil redox sensor network and present the method and results of laboratory and field tests performed. The experiment was conducted by running the prototype RF based equipment alongside a closely matched contemporary control system. Results indicate close correlation between experimental and control data