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박구만 호남대학교 1997 호남대학교 학술논문집 Vol.18 No.4
For the consumer use VCR, the quantizer is selected based on CLASS and QNO. CLASS is determined for each DCT block according to the characteristics of the block, for example, the maximum value of AC coefficients. Six DCT blocks comprise a macroblock for which a QNO is determined. All of the quantizers defined in the specifications are numvbered from 0 to 15 by QNO. Different quantizers can be referenced by the same QNO and are discriminated by CLASS. In this paper, we propose a new method to determine these parameters, QNO and CLASS, for the selection of a quantizer per each DCT block. We first determine QNO for a macroblock and then fine-tune the quantizers by adjusting CLASS of each DCT block. For this we propose a modified quantizer map with a reduced set of quantizers, which preserves the compatibility with the conventional one. The results of our experiment show that our method outperforms the conventional method.
MPEG 비트스트림의 비트율 변환을 위한 비트율 제어기 개발
박구만,이광직 서울産業大學校 2000 논문집 Vol.51 No.2
The concept of MPEG-2 transcoding is related to the changing or scaling the amount of data in a previously encoded MPEG bitstream. The development of the bit rate converting transcoder consists of three parts which are the coding structure, the bit rate controller and the quantizer. We introduced a new rate-quantization model based on the macroblock activity and DCT coefficients. This model can be commonly used among different type of pictures such as I-, P-, and B-pictures. A new bit rate control algorithm is proposed that uses a priori knowledge from the given bitstream and it showed a better performance over the MPEG-2 TM5 algorithm by the computer simulation.
E-Mail client개념에 의한 인터넷 팩스에 관한 연구
박구만 호남대학교 산업기술연구소 1998 산업기술연구논문집 Vol.6 No.-
본 논문에서는 메일 클라이언트 개념에 의한 새로운 인터넷 팩스 개념을 제안하였다. 기존의 인터넷 팩스는 대형 서비스 업체의 서버를 이용하여 일반 가입자가 장거리 팩스를 송수신 할 수 있었다. 본 연구에서는 인터넷 계정만을 가지고 있으면 서비스 업체의 서버를 통하지 않고도 메일 송수신 개념을 이용하여 팩스를 송수신 할 수 있게 하였다. 또한 기존의 팩스기기에서도 부가 장치 없이도 인터넷을 이용하여 팩스문서를 전송할 수 있도록 하였다. 이를 위해 메일 클라이언트 프로그램은 자동전화응답장치를 이용하여 최종목적지 전화번호를 입력받을 수 있게 하였다. In this paper we have developed the internet facsimile transmission program based on the electronic mail client concept. In the conventional internet facsimile service, a user should send the document through the server provided by the ISP(internet service provider). In this newly developed without using the ISP's server. In this system a facsimile document is sent in the form of electronic mail measage. This system also provides the convenience for the existing facsimile machine that has no network adaptor. The automatic response system is combined into the our system in order to receive any telephone numbers from the facsimile machine user.
Background Initialization by Spatiotemporal Similarity
박구만,Park, Goo-Man The Korean Institute of Broadcast and Media Engine 2007 방송공학회논문지 Vol.12 No.3
A background initialization algorithm based on the spatiotemporal similarity measure in a motion tracking system is proposed. From the accumulated difference between the base frame and the other frames in a subinterval, the regions affected by moving objects are located. The median is applied over the subsequence in the subinterval in which co-located regions share the similarity. The outputs from each subinterval are filtered by second stage median filter. The proposed method showed good results even in the busy and crowded sequences where the real background does not exit.