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Mobile Phone상에서의 Camera Interface방식 및 그에 따른 성능 비교
엄민영(Minyoung Eom),강태익(Tae-ik Kang) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
As we enter the 3G world, the new mobile handsets are challenged to show more and more functions. In order to process high-resolution image, the high-speed data transfer technology that was originally used in communication system or server system started to be adopted in mobile handsets. In this paper, we describe and compare some technologies for high-speed data transfer between camera and ISP focusing on the specifications in the physical layer, and then going over the structural features of the mobile handsets. Most of these technologies are based on the serial interface and they show excellence in terms of power, bandwidth and EMI in comparison to the conventional parallel interface based on the LVCMOS technology. To verify this fact, this paper presents comparison of the SMIA interfaced camera module which represents the serial interface and the parallel interfaced camera module which interfaced camera module which represents the parallel interface.
압축 영역에서 intra mode와 에지 방향성을 이용한 H.264 비디오 장면 전환 검출
홍보현(Bohyun Hong),엄민영(Minyoung Eom),최윤식(Yoonsik Choe) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
This paper presents a novel scene change detection method using intra prediction mode and edge direction in H.264/AVC. When scene change occurs, there are less temporal correlation between frames, most of macro-blocks encoded in intra mode. Using this property, the method calculates the percentage of intra mode blocks in each predictive frame in order to get candidates of scene change frame. To further find scene change, we obtain edge histogram of each candidates by using eight prediction direction of intra prediction mode in H.264/AVC. We detect scene change frames with ?¹-norm of edge histograms. The experimental results show that the method is efficient and robust.
히스토그램 기반 영상 처리를 위한 압축영역에서의 효율적인 히스토그램 추출 기법
朴俊泂(Jun-Hyung Park),嚴玟煐(Minyoung Eom),崔潤植(Yoonsik Choe),南在烈(Jae Yeal Nam),元致善(Chee Sun Won) 대한전기학회 2006 전기학회논문지 D Vol.55 No.8
Due to development of internet network environments and data compression techniques, the size and amount of multimedia data has greatly increased. They are compressed before transmission or storage. Dealing with these compressed data such as video retrieval or indexing requires decompression procedure in most cases. This causes additional computations and increases the processing time. In various applications a histogram is one of the most frequently used tools. Efficiency of extracting such histograms will drop down if decompression is involved. We propose a novel scheme for extracting histograms from images that are transformed into the compressed domain by 8x8 DCT(Discrete Cosine Transform). In this scheme an averaged version of original image is obtained by a simple linear combination of DCT coefficients with the sets of coefficients we designed.
히스토그램 기반 영상 처리를 위한 압축영역에서의 고속 히스토그램 추출 기법
박준형(Jun-Hyung Park),엄민영(Minyoung Eom),최윤식(Yoonsik Choe) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
Due to development of Internet network environments and data compression techniques, the size and amount of multimedia data has greatly increased. They are compressed before transmission or storage. Dealing with these compressed data such as video retrieval or indexing requires the decoding procedure most of the time. In video retrieval and indexing a color histogram is one of the most frequently used tools. We propose a novel scheme for extracting color histograms from images transformed into the compressed domain using 8×8 DCT(Discrete Cosine Transform). In this scheme an averaged version of original image is obtained by filtering DCT coefficients with a filter we designed.