• 대한전기학회논문지:시스템및제어부문D
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• 제54권5호
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• pp.327-329
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• 2005

Conventional CDDA(Compact Disc Digital Audio) system has limitation which means that bandwidth and resolution of the sign릴 are determined by the sampling frequency and quantization bit, 44.1kHz and 16 bit respectively. Though, new medium such as DVD-audio is developed for high-resolution audio recording, it has high complexity and difficulty in manufacturing process. So, CDDA is a widely used medium for high fidelity audio yet. In this paper, we design a new encoding system for high-resolution audio signal which has backward compatible with conventional CDDA. By evaluating for the encoding and decoding process. we verify the availability of our proposed system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.373-374
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• 2006

JPEG2000 achieves a target bit rate by selecting the bitstream for adequate coding passes after encoding full passes in Tier-1 coder. Tier-1 encoding is complicated and time-consuming process. In this paper, we propose a new rate control technique that chooses the necessary passes without the full passes coding of Tier-1 by using previous image information for volumetric image. The simulation result shows that the proposed technique reduces encoding time of coding passes up to 81.5%.

• 한국CDE학회논문집
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• 제7권4호
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• pp.262-268
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• 2002

Octree representation has the advantage of being able to represent complex shapes approximately through the repetition of simple primitive shapes. Due to this reason, octree representation together with VRML(Virtual Reality Modelling Language) is usually used for approximating 3D shapes. Since the data size of octree representation increases rapidly as 3D shape to be represented is more and more complicated, its transmission time also increase. In this paper, provided is the new octree representation and encoding/decoding scheme for real-time transmission through the internet in order to visualize 3D geometric data of large size approximately.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.536-537
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• 2018

본 논문은 개와 고양이에 해당하는 애완동물 영상에서 세부 분류인 동물의 종을 인식하는 것을 목표로 한다. 영상의 세부 분류 인식에 대한 연구는 계속적으로 발전하고 있지만, 다형성의 성질을 갖는 동물에 대한 객체인식 연구는 더디게 진행되고 있다. 본 논문에서는 객체 분리를 위해 Grab-cut 알고리즘을 이용하고, 영상 인코딩을 위해 Fisher Vector를 이용하여 더 높은 동물 객체인식 방법을 제안한다.

• ETRI Journal
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• 제33권4호
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• pp.641-644
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• 2011

In this letter, we propose a novel bitrate control, using both Kalman and FIR filters, based on a Hamiltonian analysis with respect to the amount of bits from each macroblock, in an encoding of a general video codec such as H.264/AVC. Since the proposed bitrate control is based on the simple computation of an optimal control method based on the Hamiltonian analysis, it is not necessary to use additional computation, such as a DCT or quantization, to estimate the bits for bitrate control. As a result, the proposed algorithm can be applied to single-pass encoding and can provide sufficient encoding speed with respect to various applications, even those requiring real-time control.

• ETRI Journal
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• 제33권5호
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• pp.822-825
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• 2011

Level-encoded dual-rail (LEDR) has been widely used in onchip asynchronous interconnects supporting a 2-phase handshake protocol. However, it inevitably requires 2N wires for N-bit data transfers. Encoder and decoder circuits that perform an asynchronous 2-phase handshake protocol with only N wires for N-bit data transfers are presented for on-chip global interconnects. Their fundamentals are based on a ternary encoding scheme using current-mode multiple valued logics. Using 0.25 ${\mu}m$ CMOS technologies, the maximum reduction ratio of the proposed circuits, compared with LEDR in terms of power-delay product, was measured as 39.5% at a wire length of 10 mm and data rate of 100 MHz.

• 한국통신학회논문지
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• 제33권1C호
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• pp.124-130
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• 2008

We present in this paper a method of digital watermarking for video data based on the discrete wavelet transform. In the proposed method, a watermark signal is inserted into the decompressed bitstream while detection is performed using the uncompressed video. This method allows detection if video has been manipulated or its format changed. We embed the watermark in the lowest frequency components of each frame in the un-coded video by using wavelet transform. The watermark can be extracted directly from the decoded video without access to the original video. Experimental results show that the proposed method gives the watermarked video of better quality and is robust against MPEG coding, down sampling and re-encoding to other type of video format such as MPEG4, H.264

• 한국전자통신학회논문지
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• 제7권1호
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• pp.117-124
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• 2012

본 논문에서는 cycle-4를 쉽게 피하고 가변 부호율과 길이로 접근할 수 있게 하는 순환 치환 행렬(CPM; circulant permutation matrix)을 토대로 한 간단한 패리티 검사 행렬의 구성 방법을 제안한다. 결과적으로 부행렬 연산은 여러 CPM들의 곱셈으로 처리될 수 있으며 LDPC 부호화 계산은 매우 간단하게 수행된다. 또한 LDPC 부호의 고속 부호화 문제를 고려한다. 제안한 설계는 정규, 비정규 LDPC 부호 둘 다를 위한 간단한 행렬 연산에 근거한 고속 부호화를 가능하게 한다.

• 한국정보처리학회논문지
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• 제4권8호
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• pp.2133-2142
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• 1997

프랙탈 영상압축은 블록단위의 비교방식을 사용함으로써 기존의 압축 방법에 비해 획기적으로 증대된 압축율을 보인다. 소프트웨어에 의한 실시간대 재생이 가능함에도 불구하고 프랙탈 영상압축의 실용화에 관건이 되는 것은 압축에 소요되는 시간이다. 본 논문에서는, i)영상내부의 차원정보 추출 및 군집화에 의해 유사블럭 탐색 횟수를 줄임으로써 압축에 소요되는 시간을 최소화시키는 알고리즘과 ii)영상내부의 휘도 및 명암대비 정보를 사용하여 재생영상의 화질을 증가시키는 알고리즘을 제안하고 검증함으로써, 고속이면서도 상대적으로 고화질을 유지할 수 있는 방법을 제시하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권2호
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• pp.374-388
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• 2011

Biometric discretization is a process of transforming continuous biometric features of an identity into a binary bit string. This paper mainly focuses on improving the global discretization method - a discretization method that does not base on information specific to each user in bitstring extraction, which appears to be important in applications that prioritize strong security provision and strong privacy protection. In particular, we demonstrate how the actual performance of a global discretization could further be improved by embedding a global discriminative feature selection method and a Linearly Separable Subcode-based encoding technique. In addition, we examine a number of discriminative feature selection measures that can reliably be used for such discretization. Lastly, encouraging empirical results vindicate the feasibility of our approach.