Are pelagic species such as sharks and tuna distributed homogenously or heterogeneously in the oceans? Large assemblages of these species have been observed at seamounts and offshore islands in the eastern tropical Pacific, which are considered hotspots of pelagic biodiversity. Is the species distribution uniform at these hotspots or do species aggregate at a finer spatial scale at these sites?...

We investigate a time-varying trellis coded multiple-access scheme using noncoherent mFSK signals. Techniques similar to this were originally proposed by Cohen, Heller, and Viterbi[1] and more recently in a mFSK form by Viterbi.[2] In these multiple-access systems van der Muelen[3] Ahlswede[4] Liao[5], Gaarder and Wolf [6], Kasami and Lin[7], Weldon[8] and Wolf[9] have shown that the decoded sy...

A coding method for face images by segmenting face regions such as eyes, mouth, etc. is introduced. Each region is removed from the face image, leaving a smoothly interpolated background which is suitable for e5cient compression. Extracted region images are coded using vector quantization. The overall method is found to achieve comparable compression ratios with compatible image coding methods....

In this paper, we present a new multiple stage vector quantization method that allows the adaptation of the quantizer to signal to be coded. This adaptation is computationally very simple and is made with no increase in bit-rate. The resul t ing quant izer prov ides a robust performance across different speakers and environments. I t has been applied to the quantization of the LPC parameters an...

— Structurally random matrices (SRMs) have been proposed as a practical alternative to fully random matrices (FRMs) for generating compressive sensing measurements. If the compressive measurements are transmitted over a communication channel, they need to be efficiently quantized and coded and hence knowledge of the measurements' statistics reequired. In this paper we study the statistical dist...

An image compression method combining discrete wavelet transform (DWT) and vector quantization (VQ) is presented. First, a three-level DWT is performed on the original image resulting in ten separate sub bands. These sub bands are then vector quantized. VQ indices are Huffman coded to increase the compression ratio. Lloyd extended scalar quantization technique is used to design memory less vect...

Visual quality optimization techniques applied to ratecontrol in SVC Type Master degree thesis Peoples 1 person Reference Tea Anselmo – [email protected] Daniele Alfonso – [email protected] Deliverables Final Report, Presentation and Code Description In digital video coding, the main aim of bit-rate control is to provide a bit-stream with a final data rate as close as possible to a predef...

This letter presents a new approach to reduce coding artifacts in transform image coding. We approach the problem in an estimation of each transform coefficient from its quantized version with its local mean and variance. The proposed method can reduce much coding artifacts of low bit-rate coded images, and at the same time guarantee that the resulting images satisfies the quantization error co...

After a recollection on compression through a projection onto a polyhedral set (which generalizes the compression by coordinates quantization), we express, in this framework, the probability that an image is coded with K coefficients as an explicit function of the approximation error.