Hyun-Yeol Chung

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In this paper, we propose a discrete wavelet transform (DWT) based watermarking method, which can be conveniently integrated in up-coming JPEG-2000 baseline. Conventional DWT based watermarking techniques insert a watermark into the coefficients after the transform completed, while the proposed method inserts a watermark into the coefficients obtained from(More)
A Speech and Character Combined Recognition System (SCCRS) is developed for working on PDA (Personal Digital Assistants) or on mobile devices. In SCCRS, feature extraction for speech and for character is carried out separately, but recognition is performed in an engine. The recognition engine employs essentially CHMM (Continuous Hidden Markov Model)(More)
The difference between training and testing environments is the major reason of performance degradation of speech recognition. In this paper, to further decrease the mismatch, we apply temporal filtering, Auto-Regression and Moving-Average (ARMA) filtering or RelAtive SpecTrAl (RASTA) filtering, as a post-processor for the log-Energy dynamic Range(More)
—Recently, the remarkable progress of network technology has increased the requirement for transmission of high quality multimedia data. By the trend, it has been issued to investigate an efficient methodology for quality measurement of transmitted multimedia data. In this paper, we propose a new audio quality measurement technique to substitute for a(More)