Viewpoint-invariant Fourier descriptors for 3D planar shape representation

Kwok, S. K.; Poon, J.C.H.

doi:10.1049/el:19961217

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…Geometric invariants [14] are used explicitly [15] or implicitly in previous work. Explicit features include moments [15] or the Fourier descriptors [16]. An example of implicit features is to locate feature points based on reference points, which is commonly used for decoding 2-D barcodes.…”

Section: A Mobile Vision and Recognitionmentioning

confidence: 99%

VCode—Pervasive Data Transfer Using Video Barcode

Liu¹,

Doermann²,

Li³

2008

IEEE Trans. Multimedia

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In this paper, we describe a novel data transfer scheme that uses the camera in a smart phone as an alternative data channel. The data is encoded as a sequence of 2-D barcode images, displayed on a flat panel display, acquired by the camera, and decoded in real time by the software embedded in device. The decoded data is written to a file. Compared with existing data channels, such as CDMA/GPRS, cables, Bluetooth, and Infrared, our method relies on visual communication and does not require special hardware or data plans. Users only need to point the camera at a monitor displaying the VCode to download. Technical challenges to overcome include correction of perspective distortion, compensation for contrast variation, and efficient implementation of small footprint software into a mobile device. We address these challenges and present our solution in detail. We have implemented a prototype which allows users to download various types of files successfully, including pictures, ring tones and Java games onto camera phones running Symbian and Windows Mobile platforms. We discuss the limitations of our solution and outline future work to overcome these limitations.

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