Dr. Sungdae Cho Profile

Dr. Sungdae Cho

at Samsung Electronics Co

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Publications (8)

Proceedings Article | 14 March 2005 Paper

Integrated lossy, near-lossless, and lossless compression of medical volumetric data

Sehoon Yea, Sungdae Cho, William Pearlman

Proceedings Volume 5685, (2005) https://doi.org/10.1117/12.585931

KEYWORDS: Wavelets, Image compression, Computer programming, 3D image processing, Medical imaging, Liver, Skull, Wavelet transforms, Data compression, 3D video compression

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Proceedings Article | 17 January 2005 Paper

Fast and constant time random access decoding with log(2)n block seek time

Yushin Cho, Sungdae Cho, William Pearlman

Proceedings Volume 5682, (2005) https://doi.org/10.1117/12.585332

KEYWORDS: Computer programming, Binary data, Image compression, Image storage, Image retrieval, Video, Image processing, Computing systems, Systems engineering, Electronics

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Proceedings Article | 18 January 2004 Paper

Robust image transmission using a new joint source channel coding algorithm and dual adaptive OFDM

Masoud Farshchian, Sungdae Cho, William Pearlman

Proceedings Volume 5308, (2004) https://doi.org/10.1117/12.524906

KEYWORDS: Orthogonal frequency division multiplexing, Distortion, Forward error correction, Receivers, Failure analysis, Image compression, Image transmission, Error analysis, Algorithm development, Image processing

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In this paper we consider the problem of robust image coding and packetization for the purpose of communications over slow fading frequency selective channels and channels with a shaped spectrum like those of digital subscribe lines (DSL). Towards this end, a novel and analytically based joint source channel coding (JSCC) algorithm to assign unequal error protection is presented. Under a block budget constraint, the image bitstream is de-multiplexed into two classes with different error responses. The algorithm assigns unequal error protection (UEP) in a way to minimize the expected mean square error (MSE) at the receiver while minimizing the probability of catastrophic failure. In order to minimize the expected mean square error at the receiver, the algorithm assigns unequal protection to the value bit class (VBC) stream. In order to minimizes the probability of catastrophic error which is a characteristic of progressive image coders, the algorithm assigns more protection to the location bit class (LBC) stream than the VBC stream. Besides having the advantage of being analytical and also numerically solvable, the algorithm is based on a new formula developed to estimate the distortion rate (D-R) curve for the VBC portion of SPIHT. The major advantage of our technique is that the worst case instantaneous minimum peak signal to noise ratio (PSNR) does not differ greatly from the averge MSE while this is not the case for the optimal single stream (UEP) system. Although both average PSNR of our method and the optimal single stream UEP are about the same, our scheme does not suffer erratic behavior because we have made the probability of catastrophic error arbitarily small. The coded image is sent via orthogonal frequency division multiplexing (OFDM) which is a known and increasing popular modulation scheme to combat ISI (Inter Symbol Interference) and impulsive noise. Using dual adaptive energy OFDM, we use the minimum energy necessary to send each bit stream at a particular probability of bit error. An added benefit of OFDM over serial transmission schemes is that some degree of progressiveness of SPIHT is preserved by transmitting both the VBC and LBC streams in parallel.

Proceedings Article | 7 May 2003 Paper

Error-resilient video coding with improved 3D SPIHT and error concealment

Sungdae Cho, William Pearlman

Proceedings Volume 5022, (2003) https://doi.org/10.1117/12.476433

KEYWORDS: Error analysis, Wavelets, Video, Computer programming, Video coding, Wavelet packet decomposition, 3D image processing, 3D video compression, Video compression, Automatic repeat request

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Proceedings Article | 21 November 2002 Paper

Field tests of error-resilient 3D SPIHT vs. MPEG-2

Bruce Suter, William Pearlman, Sungdae Cho, Keesook Han

Proceedings Volume 4790, (2002) https://doi.org/10.1117/12.457261

KEYWORDS: Video, Video compression, Forward error correction, 3D image processing, 3D video compression, Error analysis, Satellite communications, Satellites, 3D video streaming, Computer programming

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Proceedings Article | 4 January 2002 Paper

Embedded video compression with error resilience and error concealment

Sungdae Cho, William Pearlman

Proceedings Volume 4671, (2002) https://doi.org/10.1117/12.453077

KEYWORDS: Error analysis, Video compression, Wavelets, 3D video compression, Video, 3D image processing, Error control coding, Computer programming, Wavelet transforms, Automatic repeat request

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Proceedings Article | 7 December 2001 Paper

Unequal error protection of embedded video bitstreams

Sungdae Cho, William Pearlman

Proceedings Volume 4472, (2001) https://doi.org/10.1117/12.449793

KEYWORDS: Video, Error control coding, 3D image processing, Computer programming, Forward error correction, 3D video compression, Wavelets, Video compression, Image compression, Wavelet transforms

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Proceedings Article | 28 December 2000 Paper

Error-resilient compression and transmission of scalable video

Sungdae Cho, William Pearlman

Proceedings Volume 4115, (2000) https://doi.org/10.1117/12.411608

KEYWORDS: 3D video compression, Video, Video compression, Automatic repeat request, Error control coding, Forward error correction, Wavelets, Computer programming, Wavelet transforms, 3D video streaming

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Showing 5 of 8 publications

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