Robert E. Van Dyck

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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)
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 signi cant performance degradation when devices are colocated in the same environment. The main goal of this paper is to evaluate the e ect 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)
The combination of subband coding and vector quantization can provide a powerful method for compressing color images. The use of properties of the human visual system can increase the performance of such a system and allow one to achieve very high quality reconstructed images at compression ratios exceeding 10:1. In this paper, we design a color(More)
The advance of technology makes video acquisition devices better and less costly, thereby increasing the number of applications that can effectively utilize digital video. Compared to still images, video sequences provide more information about how objects and scenarios change over time. However, video needs more space for storage and wider bandwidth for(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)
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)