The Use of Border in Colour 2D Barcode. - Siong Khai Ong; Douglas Chai; Keng T. Tan (ISPA, 2008)

Modelling of Camera Phone Capture Channel for JPEG Colour Barcode Images. - Keng T. Tan; Siong Khai Ong; Douglas Chai (FGIT-SIP, 2009)

Adaptive use of thresholding and multiple colour space representation to improve classification of MMCC barcode. - Siong Khai Ong; Douglas Chai; Alexander Rassau (ICME, 2011)

Designing a Color Barcode for Mobile Applications. - Keng T. Tan; Douglas Chai; Hiroko Kato; Siong Khai Ong (IEEE Pervasive Comput., 2012)