1
Charilaos Christopoulos, Niklas Björk: Transcoder. Telefonaktiebolaget LM Ericsson, Nixon & Vanderhye P C, February 25, 2003: US06526099 (84 worldwide citation)


In a transcoder means are provided for implementing a simultaneous change in rate and in resolution. In a preferred embodiment means are also provided for transferring incoming motion vectors or the like directly to the output encoder. The transcoder architecture is both suited for implementation in ...


2
Göran A P Eriksson, Jan Höller, Niklas Björk, Charilaos Christopoulos: Access point discovery and selection. Telefonaktiebolaget LM Ericsson, November 28, 2006: US07143171 (33 worldwide citation)


A method and system in a heterogeneous environment, capable of locating at least one optimal access area or point for supporting one or more access technologies requested by the user. The determination of the optimal access areas or points is based in part on the location of the device, the specifie ...


3
Charilaos Christopoulos, Niklas Björk, Francisco Rivas, Göran A P Eriksson: Interactive access, manipulation, sharing and exchange of multimedia data. Telefonaktiebolaget LM Ericsson, November 1, 2005: US06961754 (33 worldwide citation)


In a multimedia environment, end-users are provided with the ability to effectively access, manipulate and share one or more multimedia objects, or select portions thereof, independent of the terminal and/or network capabilities that are associated with the terminals employed by each end-user. This ...


4
David Nister, Charilaos Christopoulos: Lossless region of interest coding. Telefonaktiebolaget LM Ericsson, Nixon & Vanderhye P C, August 10, 2004: US06775412 (16 worldwide citation)


In a method and a device for transmission of S+P transform coded digitized images a mask is calculated by means of which a region of interest (ROI) can be transmitted lossless whereby the ROI can be transmitted and received lossless and still maintaining a good compression ratio for the image a ...


5
Yousri Abdeljaoud, Touradj Ebrahimi, Charilaos Christopoulos, Ignacio Mas Ivars: Method and a system for generating summarized video. Telefonaktiebolaget LM Ericsson, Nixon & Vanderhye P C, February 10, 2004: US06690725 (14 worldwide citation)


An algorithm for video summarization is described. The algorithm combines photometric and motion information. According to the algorithm, the correspondence between feature points is used to detect shot boundaries and to select key frames. Thus, the rate of feature points, which are lost or initiate ...


6
Charilaos Christopoulos: Progressive image coding. Telefonaktiebolaget Lm Ericsson, Nixon & Vanderhye P C, February 29, 2000: US06031572 (13 worldwide citation)


A method and a transmission system for use in coding and Progressive Image Transmission (PIT), in which the transmitter at the initial stages of the transmission uses a Region Based Coding (RBC) scheme (905) in order to provide the receiver with an image of good visual quality at a high compression ...


7
Charilaos Christopoulos, David Nister: Embedded DCT-based still image coding algorithm. Telefonaktiebolaget LM Ericsson, Nixon & Vanderhye P C, August 1, 2006: US07085425 (11 worldwide citation)


In an embedded DCT-based (EDCT) image coding method, decoded images which give better PSNR over earlier JPEG and DCT-based coders are obtained by a scanning order starting, for each bitplane, from the upper left corner of a DCT block (corresponding to the DC coefficient) and transmitting the coeffic ...


8
Charilaos Christopoulos, Joel Askëlöf, Mathias Larsson: Method and a system for coding rois. Telefonaktiebolaget LM Ericsson, Nixon & Vanderhye P C, October 12, 2004: US06804405 (8 worldwide citation)


In a method and a system for encoding and transmission of still images having at least one region of interest (ROI), the ROI coefficients of an image transformed into the frequency domain, preferably using a wavelet transform are encoded so that they are transmitted first and can be decoded by a rec ...


9
Mathias Larsson, Charilaos Christopoulos, Magnus Jandel, Diego Santa Cruz, Touradj Ebrahmi: Partial retrieval of images in the compressed domain. Nixon & Vanderhye PC, June 12, 2003: US20030110299-A1 (5 worldwide citation)


In a method and a system for retrieving images in a client-server system, images are stored as a set of independently decodable units (CU's) on the server. A client issues a series of requests for image information. Each request contain a request number, information on what image information the cli ...


10
Charilaos Christopoulos, Niklas Bjork, Joel Askelof: Method and apparatus for intelligent transcoding of multimedia data. Burns Doane Swecker & Mathis L, November 29, 2001: US20010047517-A1 (5 worldwide citation)


A method and apparatus is described for performing intelligent transcoding of multimedia data between two or more network elements in a client-server or client-to-client service provision environment. Accordingly, one or more transcoding hints associated with the multimedia data may be stored at a n ...



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