• Title/Summary/Keyword: 영상 요약

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Differential Effects of 2D and 3D motion pictures on physical fatigue, recognition and arousal -Focused on viewing order and viewer's gender difference- (2D와 3D 영상 시청이 신체피로도, 재인기억 및 각성수준에 미치는 차별적 효과 -시청순서와 성차를 중심으로-)

  • Lee, Jae-Sik;Park, Dong-Jin
    • Science of Emotion and Sensibility
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    • v.13 no.4
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    • pp.621-634
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    • 2010
  • This study aimed to investigate the effects of dimensions of movie clip (2D vs. 3D), viewing orders (2D ${\to}$ 3D vs. 3D ${\to}$ 2D), and gender difference on participants' subjective fatigue, recognition for the elements in the clips, and arousal level. The results can be summarized as followings. First, subjective fatigue level was higher in the 3D condition than 2D condition, but this tendency was more clear in the 2D ${\to}$ 3D condition than in the 3D ${\to}$ 2D condition. Second, correct recognition rates were significantly higher for 3D than 2D only in the 3D ${\to}$ 2D condition. In particular, male participants showed higher correct recognition rates than female participants in the 3D clip condition, whereas female participants showed higher correct recognition rates than male participants in the 2D clip condition. Third, although 3D clips tended to induce higher level of arousal, this tendency was showed only in the 2D ${\to}$ 3D condition, which implied previous exposure to 2D clip increased the arousal level in following 3D clip than vice versa.

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Preprocessing Technique for Improving Action Recognition Performance in ERP Video with Multiple Objects (다중 객체가 존재하는 ERP 영상에서 행동 인식 모델 성능 향상을 위한 전처리 기법)

  • Park, Eun-Soo;Kim, Seunghwan;Ryu, Eun-Seok
    • Journal of Broadcast Engineering
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    • v.25 no.3
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    • pp.374-385
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    • 2020
  • In this paper, we propose a preprocessing technique to solve the problems of action recognition with Equirectangular Projection (ERP) video. The preprocessing technique proposed in this paper assumes the person object as the subject of action, that is, the Object of Interest (OOI), and the surrounding area of the OOI as the ROI. The preprocessing technique consists of three modules. I) Recognize person object in the image with object recognition model. II) Create a saliency map from the input image. III) Select subject of action using recognized person object and saliency map. The subject boundary box of the selected action is input to the action recognition model in order to improve the action recognition performance. When comparing the performance of the proposed preprocessing method to the action recognition model and the performance of the original ERP image input method, the performance is improved up to 99.6%, and the action is obtained when only the OOI is detected. It can also see the effects of related video summaries.

The MPEG-7 based Video Database (MPEG-7에 기반한 동영상 데이터베이스)

  • Lee, Soon-Hee
    • Journal of the Korea Computer Industry Society
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    • v.8 no.2
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    • pp.103-106
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    • 2007
  • In order to construct a Video Database, shot change detection should be made first. But, because these processes are not automated perfectly, we need a lot of time and efforts now. And, there are many shot change detection algorithms, which can't always insure the perfect result because of the editing effects such as cut, wipe, and dissolves used in film production. Therefore, in order to receive the exact shot change, It needs the verification and correction by manual processing at any cost. Spatiotemporal slice is a simple image condensing method for the content changes of video. The editing effects are expressed on the Spatiotemporal slice in the visually noticed form of vertical line, diagonal line, curved line and gradual color changes, etc. Accordingly the parts doubted as a shot change can be easily detected by the change of the Spatiotemporal slice without replaying the video. The system proposed in this study makes it possible to delete the false detected key frames, and create the undetected key frames on the Spatiotemporal slice.

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Scene Change Detection Algorithm for Video Abstract on Specific Movie (특수 영상에서 비디오 요약을 위한 장면 전환 검출 알고리즘)

  • Chung, Myoung-Beom;Kim, Jae-Kyung;Ko, Il-Ju;Jang, Dae-Sik
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.3
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    • pp.65-74
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    • 2009
  • Scene change detection is pretreatment to index and search video information in video search system, and it is very important technology for overall performance. Existing scene change detection used single characteristic of pixel value difference, histogram difference, etc or mixed single characteristics that have complementary relationship. However, accuracy of those researches is very poor for special video such as infrared camera, night shooting. Therefore, this paper is proposed the method that is mixed color histogram and at algorithm for scene change detection at the specific movie. To verify the usefulness of a proposed method, we did an experiment which used color histogram only and KLT algorithm with color histogram. In result, evaluation index of proposed method is improved about 11.4% at the specific movie.

Design and Evaluation of the Key-Frame Extraction Algorithm for Constructing the Virtual Storyboard Surrogates (영상 초록 구현을 위한 키프레임 추출 알고리즘의 설계와 성능 평가)

  • Kim, Hyun-Hee
    • Journal of the Korean Society for information Management
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    • v.25 no.4
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    • pp.131-148
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    • 2008
  • The purposes of the study are to design a key-frame extraction algorithm for constructing the virtual storyboard surrogates and to evaluate the efficiency of the proposed algorithm. To do this, first, the theoretical framework was built by conducting two tasks. One is to investigate the previous studies on relevance and image recognition and classification. Second is to conduct an experiment in order to identify their frames recognition pattern of 20 participants. As a result, the key-frame extraction algorithm was constructed. Then the efficiency of proposed algorithm(hybrid method) was evaluated by conducting an experiment using 42 participants. In the experiment, the proposed algorithm was compared to the random method where key-frames were extracted simply at an interval of few seconds(or minutes) in terms of accuracy in summarizing or indexing a video. Finally, ways to utilize the proposed algorithm in digital libraries and Internet environment were suggested.

Scene Change Detection and Representative Frame Extraction Algorithm for Video Abstract on MPEG Video Sequence (MPEG 비디오 시퀀스에서 비디오 요약을 위한 장면 전환 검출 및 대표 프레임 추출 알고리즘)

  • 강응관
    • Journal of Korea Multimedia Society
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    • v.6 no.5
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    • pp.797-804
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    • 2003
  • Scene change detection algorithm, which is very important preprocessing technique for video indexing and retrieval and determines the performance of video database system, is being studied widely. In this paper, we propose a more effective abrupt scene change detection, which is robust to large motion, sudden change of light and successive abrupt shot transitions rapidly. And we also propose a new gradual scene change detection algorithm, which can detect dissolve, and fade in/out precisely. Furthermore, we also propose a representative frame extraction algorithm which performs content-based video summary by novel DCT DC image buffering technique and accumulative histogram intersection measure (AHIM).

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Quality Management for Mammography Equipment and Mammography (유방촬영장치와 유방검사를 위한 품질관리)

  • zheng, Hao Yang;Cho, Pyong Kon;Kim, Tae Woo;Kim, Jung Soo;Jang, Hyon Chol;Lee, Mi Hwa
    • Journal of the Korean Society of Radiology
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    • v.12 no.5
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    • pp.683-692
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    • 2018
  • Mammography using mammography equipment is a method of examination that is being employed most widely to diagnose the early stages of breast cancer. Detecting or diagnosing a fibrous tissue, micro calcification, or mass in the breast is influenced by the quality management of mammography equipment considerably. Particularly in mammography, quality management refers to a behavior of figuring out and correcting all sorts of hindrance factors that can cause all the problems related to the equipment associated with the diminishment of diagnosed area due to the reduction of image quality in clinical imaging in advance and maintaining a consistent level of image quality and obtaining a proper image. Here, these researchers aim to summarize and report the general contents of quality management in mammography using mammography equipment.

Recent Trends of Weakly-supervised Deep Learning for Monocular 3D Reconstruction (단일 영상 기반 3차원 복원을 위한 약교사 인공지능 기술 동향)

  • Kim, Seungryong
    • Journal of Broadcast Engineering
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    • v.26 no.1
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    • pp.70-78
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    • 2021
  • Estimating 3D information from a single image is one of the essential problems in numerous applications. Since a 2D image inherently might originate from an infinite number of different 3D scenes, thus 3D reconstruction from a single image is notoriously challenging. This challenge has been overcame by the advent of recent deep convolutional neural networks (CNNs), by modeling the mapping function between 2D image and 3D information. However, to train such deep CNNs, a massive training data is demanded, but such data is difficult to achieve or even impossible to build. Recent trends thus aim to present deep learning techniques that can be trained in a weakly-supervised manner, with a meta-data without relying on the ground-truth depth data. In this article, we introduce recent developments of weakly-supervised deep learning technique, especially categorized as scene 3D reconstruction and object 3D reconstruction, and discuss limitations and further directions.

Pictorial Essay: Understanding of Persistent Left Superior Vena Cava and Its Differential Diagnosis (임상화보: 지속성 좌측상대정맥의 이해와 감별 진단)

  • Eo Ram Jeong;Eun-Ju Kang;Joo Hee Jeun
    • Journal of the Korean Society of Radiology
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    • v.83 no.4
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    • pp.846-860
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    • 2022
  • Persistent left superior vena cava (PLSVC) is a rare congenital, thoracic, and vascular anomaly. Although PLSVCs generally do not have a hemodynamic effect, several types of PLSVC and some cardiac anomalies may manifest with clinical symptoms. The presence of PLSVC can render catheterization via left subclavian access difficult when placing a pacemaker or central venous catheter. As such, recognizing a PLSVC that is typically incidentally discovered can prevent complications such as vascular injury. Differentiating vessels found in a similar location as PLSVC is necessary when performing thoracic vascular procedures. This pictorial essay explains the multi-detector CT findings of a PLSVC, and provides a summary of other blood vessels that require differentiation during thoracic vascular procedures.

Design of Multiple-symbol Lookup Table for Fast Thumbnail Generation in Compressed Domain (압축영역에서 빠른 축소 영상 추출을 위한 다중부호 룩업테이블 설계)

  • Yoon, Ja-Cheon;Sull, Sanghoon
    • Journal of Broadcast Engineering
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    • v.10 no.3
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    • pp.413-421
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    • 2005
  • As the population of HDTV is growing, among many useful features of modern set top boxes (STBs) or digital video recorders (DVRs), video browsing, visual bookmark, and picture-in-picture capabilities are very frequently required. These features typically employ reduced-size versions of video frames, or thumbnail images. Most thumbnail generation approaches generate DC images directly from a compressed video stream. A discrete cosine transform (DCT) coefficient for which the frequency is zero in both dimensions in a compressed block is called a DC coefficient and is simply used to construct a DC image. If a block has been encoded with field DCT, a few AC coefficients are needed to generate the DC image in addition to a DC coefficient. However, the bit length of a codeword coded with variable length coding (VLC) cannot be determined until the previous VLC codeword has been decoded, thus it is required that all codewords should be fully decoded regardless of their necessary for DC image generation. In this paper, we propose a method especially for fast DC image generation from an I-frame using multiple-symbol lookup table (mLUT). The experimental results show that the method using the mLUT improves the performance greatly by reducing LUT count by 50$\%$.