Robert E. Van Dyck

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The emergence of several radio technologies, such as Bluetooth and IEEE 802.11, operating in the 2.4 GHz unlicensed ISM frequency band, may lead to signal interference and result in significant performance degradation when devices are colocated in the same environment. The main goal of this paper is to evaluate the effect of mutual interference on the(More)
The emergence of several radio technologies such as Bluetooth, and IEEE 802.11 operating in the 2.4 GHz unlicensed ISM frequency band may lead to signal interference and result in significant performance degradation when devices are co-located in the same environment. The main goal of this paper is to present a simulation environment for modeling(More)
Access to multimedia data has become much easier due to the rapid growth of the Internet. While this is usually considered an improvement of everyday life, it also makes unauthorized copying and distributing of multimedia data much easier, therefore presenting a challenge in the field of copyright protection. Digital watermarking, which is inserting(More)
— Previously, we proposed a trellis coded modulation system using CPFSK and ring convolutional codes for transmitting the bits generated by an embedded zerotree wavelet encoder. Improved performance is achieved by using maximum a posteriori (MAP) decoding of the zerotree symbols. In this paper, the optimal ring convolutional trellis codes are determined for(More)
— The evaluation of existing and future distributed sensor processing system concepts can be done well using simulation , provided that the simulation is faithful in representing both the medium in which the sensors interface with the phenomena that they measure or detect and the medium in which the sensors interface with each other to achieve a distributed(More)
—In this paper, a novel robust image-coding and adaptive-packetization algorithm suitable for very low bit-rate transport is suggested. This algorithm can be applied to any zerotree-based encoder, such as the embedded zerotree wavelet coder of Shapiro and set partitioning in hierarchical trees by Said and Pearlman. A very explicit segmentation and(More)
— The rapid growth of digital multimedia technologies brings tremendous attention to the field of digital water-marking. One application for digital watermarking is fingerprinting. The owner or the distributor of the multimedia data can insert unique watermarks into copies for different customers or receivers, which will be helpful to identify the source of(More)
n Orientatio l S a subband at the l th decomposition level and at one of three orientations D-R distortion-rate T 0 initial threshold c(i,j) the wavelet coefficient at location (i,j) x a function which chooses the largest integer less than x l D the domain tree whose coarsest coefficients are in the decomposition level l 1 − l R the range tree whose(More)