• Journal of Broadcast Engineering
• /
• v.22 no.6
• /
• pp.765-773
• /
• 2017

Ultra-high definition videos, panorama contents, and ultra-wide viewing videos have a huge spatial resolution. However, a whole region of images is not always interesting to viewers due to limitations of system resources and display devices. To allow one or more interesting tiles to be decoded freely without decoding other tiles, this paper introduces a tile-based independent coding method. The propose method restraints motion vectors to be within a tile region shifting motion search area and modifying an initial motion vector. Experiments results show that any desired tile is capable to be decoded independently of other tiles.

• Korean Institute of Interior Design Journal
• /
• no.34
• /
• pp.149-156
• /
• 2002

This study intends to acquire objective models for basic quantitative analysis of pattern and space through image-recognition technique, and verify the effectiveness of such acquired models. Many experiments showed that the recognized result can be varied depending on the different viewpoints and the analysis based on the single-viewpoint images does not provide objectivity. The experiment using multi-viewpoint image models, which was attempted as an alternative for the disadvantages, showed the recognition similar to that of the actual model. Especially, images generated at laboratory using miniature model may be useful in comparing and understanding plural number of patterns. The models that have been acquired using such images may be hard to use in acquiring images for analyzing actual building patterns or indoor space, although they may be useful in pattern analysis using miniature model. The disadvantage, however, can be supplemented with panorama VR and C. G. simulation technique. Steady researches are required on the application of visual information to the image recognition principle and the model for quantitative analysis of pattern and space in addition to the research on the construction of the model that can be used in comparing and analyzing not only form and space but also miniature models.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2015.07a
• /
• pp.171-172
• /
• 2015

Vinalines is actually known as not only one of Vietnam's state-sponsored economic giants but also the largest shipowner by tonnage in Vietnamese shipping industry. Therefore, a question of how to improve business performance of the corporation is always received deep attention by Vietnamese government, specially after the seriously economic scandal of Vinalines in a last few years. Among development strategies, the study focuses on short-term one in which Vinalines is recommended to restructure its own fleet in order to optimize performance of fleet operation and minimize costs while meeting the customer's shipping demand in near future. The first section is of introduction. Via method of statistical data analysis, section 2 brings to readers a panorama about the development profile and the current situation of development of Vinalines. In section 3, the authors use linear programming for setting a cost-minimization model optimizing Vinalines fleet structure based on available statistics and forecast information by Vinalines. The optimization problem is solved by applying AIMMS software in section 4. Finally, some conclusions and proposals by authors for the development of Vinalines are given.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.04a
• /
• pp.1069-1072
• /
• 2017

최근에 360도 파노라마(Panorama) 사진과 영상을 이용한 가상현실 콘텐츠 제작이 급격히 증가하고 있다. 본 연구에서는 지역문화유산의 360도 파노라마 VR 콘텐츠 속에 존재하는 3D 대상물들(Objects)을 실시간으로 출력하는 시스템에 대해 연구하였다. 본 논문에서 제안하는 시스템은 지역문화유산의 가상투어(Virtual tour)뿐만 아니라 가상투어상의 주요 대상물들을 3D 프린터로 실시간 인쇄하여 소유할 수 있다는 특징을 갖는다. 지역문화유산의 가상현실을 통한 학습효과에 추가하여 주요 문화유산의 3D 모형의 출력을 통해 지역문화유산의 형태를 좀 더 현실감 있게 학습할 수 있다는 장점과 가상투어와 디지털 생산(Digital Manufacturing)/가상 생산(Virtual Manufacturing) 기술이 결합하는 새로운 형태의 서비스가 가능할 것으로 생각된다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06b
• /
• pp.292-294
• /
• 2006

현재 대다수의 자동차에 장착된 사이드미러와 백미러 같은 기존의 비젼 시스템은 사각지대(blind spot)를 가지고 있다. 이러한 단점을 보안하기 위해 고급 자동차에는 후방에 wide-angle 카메라를 장착하고 있다. 기존의 wide-angie 카메라 시스템은 1대의 카메라를 사용하여 후방 영상을 얻고 그것을 그대로 보여줌으로서 어느 정도 사각지대를 줄여주는 역할을 하고 있지만 여전히 확보되지 않은 사각지대가 존재한다. 하지만 다수의 카메라를 사용하면 보다 넓은 후방 시야를 확보함으로서 보다 완벽하게 사각지대를 제거할 뿐만 아니라, 좀 더 다양한 위험물 정보를 주행 중에도 운전자에게 제공하는 것이 가능해진다. 본 논문에서는 사각지대를 제거하기 위해 차량의 좌. 우측 그리고 후방에 장착된 카메라를 통해 얻어진 영상물 하나의 통합된 파노라마 영상물 생성하는 방법을 제안하고 몇 가지 경우에 대해 실험한다. 우리는 3D 와핑을 통해 각 영상의 Bird's Eye View를 생성하고, 생성된 Bird's Eye View를 2차원 이동변환만을 이용해서 하나의 통합된 Bird's Eye View를 만든다. 이렇게 만들어진 통합된 영상을 후방 카메라를 기준으로 다시 3D 와핑 함으로서 완전한 파노라마 영상을 생성한다.

• Journal of Oral Medicine and Pain
• /
• v.20 no.2
• /
• pp.257-267
• /
• 1995

An Epidemiologic study was carried out on 77 TMD patients with degenerative joint disease who had visited the Orofacial Pain Clinic in Pusan National University Hospital. Al subjects were interviewed and examined clinically and radiologically using a standardized examination form. As related to gender and duration, subjective and objective sysmptoms in DJD patients were studied. The obtained results were as follows : 1. There were much more patients in the twenties or thirties, women and histories such as chronic duration and microtrauma. 2. Most patients responded positively more often to the questions of jaw function, unilateral chewing in habits, poot appetite and depression in behavioral response and shoulder pain in worsening prognosis 3. While the most common reasons for treatment were pain, noise, and limitation of opening, the associated symptoms such as headache, neckache, earache, jaw dysfunction, neck dysfunction, acute bite change and dizziness, ringing or fullness in the ears as secondary CNS excitatory effects were complained. 4. Opening the mouth in 25 to 40mm, soft end feel and deflective incisal pathway were seen and more tenderness to lateral or dorsal capsule of joint than intra or extra oral muscles were complained. 5. While there appeared no click, crepitus and single click in acute group, in chronic group, crepitus, single click and no click appeared in order of sequence. 6. Tomogram or bone scan revealed more bony changes than panorama and transcranial view.

• Imaging Science in Dentistry
• /
• v.34 no.2
• /
• pp.69-74
• /
• 2004

Purpose : This study was conducted to compare the radiomorphometric indices of the mandible on panoramic radiographs among three groups of normal, osteopenia and osteoporosis and to determine whether panoramic indices have validity in predicting osteoporotic risk. Materials and Methods: Ninty-four postmenupausal women aged 42-72 years (mean 62±7.5) were examined using dual energy X-ray absorptionmetry (DEXA) of the lumbar and classified into three groups by WHO classification. Panoramic mandibular index (PMI), mandibular cortical thickness (Mental index (MI), Antegonial index (AI), Gonial index (G!)) and the mandibular cortical index (MCI) were measured bilaterally on panoramic radiographs and analyzed. Results: There were signigicant differences among normal, osteopenic and osteoporoti groups in PMI (I), PMI (S), MI, AI, GI and MCI. The sensitivities of the MCI (93%) and the combination index of MCI and MI (90%) in diagnosing osteopenic/osteoporotic cases were high. Conclusion: The widths and shapes of the mandibular cortical bone on panoramic radiography may highly reflect the systemic osteopenic/osteoporotic conditions of the patients.

• Imaging Science in Dentistry
• /
• v.30 no.4
• /
• pp.259-263
• /
• 2000

Purpose: Upper cervical vertebrae are commonly imaged together with the jaw bones in panoramic radiography. There have been many studies investigating the possible role of mandible as an indicator of osteoporosis. But the result doesn't show unanimity. This study measured bone densities of mandible and second and third cervical vertebrae to find out any relationship between these two areas. These results may contribute in panorama being used as a screening method in detecting possible osteoporotic patient. Materials and Methods: Randomly selected 226 digitized panoramic images with cervical vertebrae shadows from 156 dental patients between 5 to 80 years of age were used. And the bone densities of second and third cervical vertebrae, apical areas of first and second mandibular molars and interdental areas were measured. The bone density measurements were restricted to the cancellous bone and the average and standard deviations and paired t-tests were done to each measurements. Results: All the measurements were statistically significantly related. The best relationship was found between the third cervical vertebrae and first and second mandibular apical areas. The average and standard deviations of the measured bone density ratios of these areas were 1.20±0.45 and 1.34±0.48 each. Conclusion: Patients whose panoramic bone density of the third cervical vertebrae are much below those of mandibular first or second molar apical areas may have osteoporosis.

• Journal of IKEEE
• /
• v.20 no.4
• /
• pp.420-423
• /
• 2016

In this paper, we proposed an implementation of panoramic image stitching that operates in real time at the embedded environment by applying ROI based PROSAC algorithm using the directionality of the image. The conventional panoramic image stitching applies SURF or SIFT algorithm which contains unnecessary computation and a lots of data to detect feature points. In this paper, we use the direction of the input image and we proposed the method of reducing the unnecessary computation by using ROI. We use a gyro sensor and an acceleration sensor. Output data from gyro and acceleration sensors can be calibrated by complementary filter. The calibration does not affect the operating time of the proposed image stitching algorithm in embedded environment. Therefore, it is possible to operate in real-time.

• 한국HCI학회:학술대회논문집
• /
• 2007.02a
• /
• pp.767-773
• /
• 2007

현재 시판되고 있는 대다수의 자동차에 장착된 사이드미러와 백미러 같은 기존의 비젼 시스템은 모두 사각지대(blind spot)를 가지고 있다. 사각지대는 크고 작은 사고의 원인이 되기도 한다. 이러한 단점을 보완하기 위해 자동차 기업들은 자사의 고급 자동차 후방에 광각(wide-angle) 카메라를 장착하고 있다. 광각 카메라 시스템은 1대의 카메라를 사용하여 후방 영상을 얻고 그것을 그대로 보여줌으로서 어느 정도 사각지대를 줄여주는 역할을 하고 있지만 후방의 모든 사각지대를 제거해주지는 못한다. 그러므로 다수의 카메라를 사용하면 보다 넓은 후방 시야를 확보함으로서 보다 완벽하게 사각지대를 제거할 뿐만 아니라, 좀 더 다양한 위험물 정보를 주행 중에도 운전자에게 제공하는 것이 가능해진다. 본 논문에서는 사각지대를 제거하기 위해 차량의 좌, 우측 그리고 후방에 3대의 카메라를 장착하고, 장착된 카메라를 통해 얻어진 영상을 통합한 파노라마 영상을 생성하는 방법과 다양한 환경에서 실험한 결과를 제시한다. 파노라마 영상을 생성하기 위해서 제안하는 방법은 3D 와핑을 통해 각 영상의 Bird's Eye View를 생성하고, 생성된 Bird's Eye View를 2차원 이동변환만을 이용해서 하나의 통합된 Bird's Eye View를 만든다. 이렇게 만들어진 통합된 영상을 후방 카메라를 기준으로 다시 3D 와핑 함으로서 완전한 파노라마 영상을 생성한다. 제시된 방법으로 다양한 상황에 따라 실험을 수행하고, 이를 통해 문제점을 찾아본다.