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Full-Text Articles in Engineering
Improving Mobile Color 2d-Barcode Jpeg Image Readability Using Dct Coefficient Distributions, Keng Tiong (Alf) Tan, Douglas Chai
Improving Mobile Color 2d-Barcode Jpeg Image Readability Using Dct Coefficient Distributions, Keng Tiong (Alf) Tan, Douglas Chai
Research outputs 2012
Two dimensional (2D) barcodes are becoming a pervasive interface for mobile devices, such as camera smartphones. Often, only monochrome 2D-barcodes are used due to their robustness in an uncontrolled operating environment of smartphones. Nonetheless, we are seeing an emerging use of color 2D-barcodes for camera smartphones. Most smartphones capture and store such 2D-barcode images in the baseline JPEG format. As a lossy compression technique, JPEG does introduce a fair amount of error in the captured 2D-barcode images. In this paper, we analyzed the Discrete Cosine Transform (DCT) coefficient distributions of generalized 2D-barcodes using colored data cells, each comprising of 4, …
An Adaptive Lossless Data Compression Scheme For Wireless Sensor Networks, Jonathan Gana Kolo, S. Andan Shanmugam, David Wee Gin Lim, Li-Minn Ang, Kah Phooi Seng
An Adaptive Lossless Data Compression Scheme For Wireless Sensor Networks, Jonathan Gana Kolo, S. Andan Shanmugam, David Wee Gin Lim, Li-Minn Ang, Kah Phooi Seng
Research outputs 2012
Energy is an important consideration in the design and deployment of wireless sensor networks (WSNs) since sensor nodes are typically powered by batteries with limited capacity. Since the communication unit on a wireless sensor node is the major power consumer, data compression is one of possible techniques that can help reduce the amount of data exchanged between wireless sensor nodes resulting in power saving. However, wireless sensor networks possess significant limitations in communication, processing, storage, bandwidth, and power. Thus, any data compression scheme proposed for WSNs must be lightweight. In this paper, we present an adaptive lossless data compression (ALDC) …