• Journal of the Korea Convergence Society
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• v.12 no.10
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• pp.1-8
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• 2021

In online meetings and classes using webcams, the chromakey technique is a very necessary part to produce content. We proposed a technology that enables background synthesis without using a cloth for chromakey. The proposed method consists of three steps: an HSI image conversion step, a step of detecting a region changed from a background, and a step of replacing the background region with a chromakey and applying it. In the input video, the block average image of each frame is calculated, and the difference between the block average image of the background image and the block average image of the input image is used to detect the change area. The developed chromakey effect technology uses a technique of acquiring a background image without an object from a single camera and extracting only an object by distinguishing the moving object and the background. The proposed method is not only capable of processing even if the background has a variety of colors, but also has the seamless processing of the boundary lines of objects.

• Journal of the Korea Computer Industry Society
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• v.3 no.7
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• pp.901-914
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• 2002

In this paper, We propose an efficient automatic caption detection and location method, caption recognition using FE-MCBP(Feature Extraction based Multichained BackPropagation) neural network for content based retrieval of video. Frames are selected at fixed time interval from video and key frames are selected by gray scale histogram method. for each key frames, segmentation is performed and caption lines are detected using line scan method. lastly each characters are separated. This research improves speed and efficiency by color segmentation using local maximum analysis method before line scanning. Caption detection is a first stage of multimedia database organization and detected captions are used as input of text recognition system. Recognized captions can be searched by content based retrieval method.

• Journal of Internet Computing and Services
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• v.3 no.2
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• pp.69-77
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• 2002

Recently, Digital video is one of the important information media delivered on the Internet and playing an increasingly important role in multimedia. This paper proposes a Video Browsing Service(VBS) that provides both the video content retrieval and the video browsing by the real-time user interface on Web, For the scene segmentation and key frame extraction of video sequence, we proposes an efficient scene change detection method that combines the RGB color histogram with the $x^2$(Chi Square) histogram. Resulting key frames are linked by both physical and logical indexing, This system involves the video editing and retrieval function of a VCR's, Three elements that are the date, the field and the subject are used for video browsing. A Video Browsing Service is implemented with MySQL, PHP and JMF under Apache Web Server.

• Journal of KIISE:Software and Applications
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• v.30 no.5_6
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• pp.497-502
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• 2003

Content-based video copy detection is a complementary approach to watermarking. As opposed to watermarking, which relies on inserting a distinct pattern into the video stream, video copy detection techniques match content-based signatures to detect copies of video. Existing typical content-based copy detection schemes have relied on image matching which is based on key frame detection. This paper proposes a motion directional histogram, which is quantized and accumulated the direction of motion, for video copy detection. The video clip is represented by a motion directional histogram as a 1-dimensional graph. This method is suitable for real time indexing and counting the TV CF verification that is high motion video clips.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.18 no.5
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• pp.205-210
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• 2008

Pearl is the organic gemstone which does not come from mines but from the biomineralization inside mollusc. Mollusc with nacre on inner surface of the shell is inevitable to make pearl. In this paper we researched and analyzed the pearls cultured using Pen shell (Atrina pectinata) which is not used in pearl farming industry but has potential to make pearls because it has thick and beautiful nacre inside the shell. SEM analysis was conducted to reveal the pattern of nacre on the Atrina pectinata pearl. Specific characteristics as sea-water pearl are detected by further analysis with ED-XRF. Aragonite specific peaks such as $1083cm^{-1}$ and $705cm^{-1}$ were shown by Raman analysis. UV-Vis analysis of Atrina pectinata pearl showed different pattern of spectrum compared with Pinctada margaritifera pearl. The reason for this discrepancy is assumed by the metabolic difference of each species.

• Journal of the Korean Society for Nondestructive Testing
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• v.29 no.5
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• pp.493-500
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• 2009

An ultrasonic signal processing algorithm was developed for extracting the information of cracks generated around the keyway of a turbine rotor disk. B-scan images were obtained by using keyway specimens and an ultrasonic scan system with x-y position controller. The B-scan images were used as input images for 2-Dimensional signal processing, and the algorithm was constructed with four processing stages of pre-processing, crack candidate region detection, crack region classification and crack information extraction. It is confirmed by experiments that the developed algorithm is effective for the quantitative evaluation of cracks generated around the keyway of turbine rotor disk.

• Journal of Broadcast Engineering
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• v.13 no.5
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• pp.662-676
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• 2008

This paper presents a video copy detection algorithm that blocks online transfer of illegally copied DTV broadcast programs. Particularly, the proposed algorithm establishes a set of keyframes by detecting abrupt changes of luminance, and then exploits the spatio-temporal features of keyframes. Comparing with the preregistered features stored in the database of DTV broadcast programs, the proposed scheme performs a function of video filtering in order to distinguish whether an uploaded video is illegally copied or not. Note that we analyze only a set of keyframes instead of an entire video frame. Thus, it is highly efficient to identify illegal copied video when we deal with a vast size of broadcast programs. Also, we confirm that the proposed technique is robust to a variety of video edit-effects that are often applied by online video redistribution, such as apsect-ratio change, logo insertion, caption insertion, visual quality degradation, and resolution change (downscaling). In addition, we perform a benchmark test in which the proposed scheme outperforms previous techniques.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.81-83
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• 2013

절도란 경제적 이익을 꾀하려는 목적으로 타인 소유의 재물을 그의 허락 없이 가져가 본인이나 제삼자의 것으로 만드는 것을 말한다. 현재 엘리베이터 내에서 자주 발생하는 범죄 중의 하나가 바로 절도이다. 본 논문에서는 절도 범죄를 장면 전환 검출 방법인 컬러 히스토그램을 이용하여 추출한다. 추출된 키 프레임들은 범죄의 주요 장면들이다. 여기서 추출된 영상은 법원에 절도죄의 중요한 증거자료로 제출된다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.271-273
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• 2003

본 논문에서는 바 코드리더로 그 정보를 읽어 낼 수 있지만, 시각적인 인쇄오류가 있는 바 코드를 고속으로 검출해 내는 방법을 제안한다. 바 코드는 해당 제품의 제품정보 및 키를 저장하기 위하여 주로 사용되어 왔다. 근래에 들어 바 코드의 활용범위가 점점 넓어지게 되면서 잘못 인쇄된 바 코드로 인하여 차후에 발생할 수 있는 시간적 경제적 손실을 줄이기 위하여 인쇄된 바 코드가 공장에서 나가기 전에 바 코드가 정확하게 인쇄되었는지를 검사하는 것이 중요하게 되었다. 특히 상품이 아니라 고객카드와 같이 바 코드 소유자의 정보를 저장하는 수단으로도 활용하는 경우는 개인이 자신의 카드를 소지하게 되므로 바 코드에 담겨있는 정보도 중요하지만 바 코드의 인쇄상태 또한 중요하다. 이는 바 코드리더로 제대로 읽혀진다 하더라도 시각적인 인쇄오류가 있는 경우 해당 고객으로부터 불만을 사게 되고 새 카드로 교체를 요구받게 되기 때문이다. 이 경우 회사의 이미지 실추는 물론 카드 교체에 따른 시간적 경제적 손실을 보게된다. 이에 본 논문에서는 바 코드의 높이가 모두 동일한 1차원(선형)바 코드를 대상으로 바 코드의 열 동질성을 이용한 시각적인 인쇄오류가 있는 바 코드를 검출해 내는 방법을 제안한다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1535_1536
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• 2009

본 논문에서는 1.5um 파장대에서 감쇄기를 이용한 유사단일광원을 이용하여 단일광자검출의 특성을 실험적으로 분석하였다. Gated Geiger 모드에서 APD를 동작 하여 열적 노이즈에 따른 양자효율을 측정하였다. 또한 APD를 이용하여 단일광자를 고속으로 검출시 문제가 되는 afterpulsing 노이즈의 온도별 특성을 분석하였다.