• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.1157-1160
• /
• 2005

The denoising and reconstruction of color images are increasingly studied in the field of computer vision and image processing. Especially, the denoising and reconstruction of color face images are more difficult than those of natural images because of the structural characteristics of human faces as well as the subtleties of color interactions. In this paper, we propose a denoising method based on PCA reconstruction for removing complex color noises on human faces, which is not easy to remove by using vectorial color filters. The proposed method is composed of the following five steps; training of canonical eigenface space using PCA, automatic extracting of face features using active appearance model, relighing of reconstructed color image using bilateral filter, extraction of noise regions using the variance of training data, and reconstruction using partial information of input images (except the noise regions) and blending of the reconstructed image with the original image. Experimental results show that the proposed denosing method efficiently removes complex color noises on input face images.

• 한국측량학회지
• /
• 제32권1호
• /
• pp.1-8
• /
• 2014

The positions, attitudes, and internal orientation parameters of three line scanners are critical factors in order to acquire the accurate location of objects on the ground. Based on the assumption that positions and attitudes of the sensors are derived either from direct geo-referencing which of using Global Positioning Systems (GPS) and Inertial Navigation Systems (INS), or from indirect geo-referencing which of using Ground Control Points (GCPs), this paper describes on biased effects of Internal Orientation Parameter (IOP) on the ground. The research concentrated on geometrical explanations of effects from different focal length biases on the ground. The Synthetic data was collected by reasonable flight trajectories and attitudes of three line scanners. The result of experiments demonstrated that the focal length bias in case of indirect geo-referencing does not have critical influences on the quality of reconstructed ground space. Also, the relationships between IO parameters and EO parameters were found by the correlation analysis. In fact, the focal length bias in case of the direct geo-referencing caused significant errors on coordinates of reconstructed objects. The RMSE values along the vertical direction and the amount of focal length bias turned out to be almost perfect linear relationship.

• 대한두개안면성형외과학회지
• /
• 제10권1호
• /
• pp.40-43
• /
• 2009

Purpose: Extensive midface defect following total maxillectomy with orbital exenteration and cheek skin resection should be three dimensionally reconstructed with a large flap that have a sufficient volume of tissue and multiple skin islands. We describe our transverse rectus abdominis myocutaneous(TRAM) free flap with three skin islands which was successfully used in this situation. Methods: A 58-year-old man was performed enbloc total maxillectomy including orbital contents and wide cheek skin because of invasive maxillary squamous cell carcinoma. He was immediately reconstructed with TRAM flap that was designed not vertical but transverse fashion for providing sufficient skin area. Also, deepithelialization procedure making for multiple skin islands was done in flap insetting period when appropriate modification according to the intraoperative situation was possible. Dead space was completely obliterated by bulky muscular tissue, and three skin islands were used for lining of lateral nasal wall, palatal surface, and cheek skin restoration. Results: Postoperative course was satisfying. Maintaining of proper ipsilateral nasal airway, loss of rhinolalia and oronasal regurgitation of food particles, and restoration of cheek contour were successfully obtained. Conclusion: We report clinical experience of threedimensional reconstruction using free TRAM flap after total maxillectomy with orbital exenteration.

• 한국의학물리학회:학술대회논문집
• /
• 한국의학물리학회 2002년도 Proceedings
• /
• pp.429-431
• /
• 2002

Metabolic analysis of biological tissues, the interventional radiology in MRT (Magnetic Resonance Treatment) and for clinical diagnoses, representation of 4-Dimensional (4D) structural information (x,y,z,t) of biological tissues is required. This paper discusses image representation techniques for those 4D MR Images. We have proposed an image reconstruction method for ultra-fast 3D MRI. It is based on image interpolation and prediction of un-acquired pictorial data in both of the real and the k-space (the acquisition domain in MRI). A 4D MR image is reconstructed from only two 3D MR images and acquired a few echo signals that are optimized by prediction of the tissue motion. This prediction can be done by the phase of acquired echo signal is proportioned to the tissue motion. On the other hand, reconstructed 4D MR images are represented as a 3D-movie by using computer graphics techniques. Rendered tissue surfaces and/or ROIs are displayed on a CRT monitor. It is represented in an arbitrary plane and/or rendered surface with their motion. As examples of the proposed representation techniques, the finger and the lung motion of healthy volunteers are demonstrated.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2022년도 추계학술대회
• /
• pp.374-375
• /
• 2022

최근, 메타버스 서비스를 통해 시간적, 공간적 제약에서 벗어나 원격지와 의사 소통을 자연스럽게 진행하는데 많이 사용하고 있다. 이러한 메타버스 콘텐츠 제작을 위해서는 실제 공간의 데이터를 기반으로 3D 모델을 복원하고, 합성할 필요가 있다. 본 논문에서는 다수의 카메라를 이용한 연속된 이미지를 기반으로 3D 생성 복원 모델을 제작하고, 복원된 3D 모델을 보정할 수 있는 기법을 제시한다. 이를 위해 오프라인으로 다중 카메라 셋업을 수행하고, 여러 각도에서 얻어진 이미지를 통해 만들어진 3D 모델에 대해 오류를 분석한 뒤 이미지 프레임 간의 매칭 기법으로 보정을 수행 하였다. 본 논문에서 제시한 움직이는 3D 물체 복원 방법을 통해 문화, 관광, 의료 등 다양한 서비스 분야에 3D 복원 데이터를 활용할 수 있을 것으로 본다.

• 한국항공우주학회지
• /
• 제40권10호
• /
• pp.833-839
• /
• 2012

본 논문에서는 후향계단 유동장 모델링 및 복원오차를 분석한다. 유동장의 밀도를 POD(Proper Orthogonal Decomposition) 기법을 통해 공간모드와 시간모드로 추출하여 수학적으로 모델링한다. 모델링 오차를 정립하여 유동에너지와 오차 사이의 관계를 정리한다. 모델링 오차를 시간영역 뿐만 아니라 주파수 영역에서의 분석을 통하여 제어측면에서 오차의 한계를 규정한다.

• International Journal of Aeronautical and Space Sciences
• /
• 제11권3호
• /
• pp.234-239
• /
• 2010

The utilization of micro-electro-mechanical system (MEMS) gyros and accelerometers in low-level inertial measurement unit (IMU) influences cost effectiveness in a positive way under the condition that device error characteristics are fully calibrated. The conventional calibration process utilizes a rate table; however, this paper proposes a new method for achieving reference calibration data from the natural motion of pendulum to which the IMU undergoing calibration is attached. This concept was validated with experimental data. The pendulum angle measurements correlate extremely well with the solutions acquired from the pendulum equation of motion. The calibration data were computed using the regression method. The whole process was validated by comparing the measurement from the 6 sensor components with the measurements reconstructed using the identified calibration data.

• 한국조경학회지
• /
• 제34권6호
• /
• pp.101-110
• /
• 2007

This study is a base research for the restoration of village landscape of the Namhan-Sansung. The Namhan-Sansung has been recognized as a top destination for dining places. However, there have been increasing concerns about the village landscape and its rich historic and cultural heritages transformed into dining places. The village landscape of Namhan-Sansung should be reconstructed as a setting for education and loaming of Korean history and culture forgotten for a long time. The landscape also should be a space where resolute resistance and spirit of Korean people and a futuristic village space where environment friendly community environment harmonizes with daily lives. Restoration efforts of village landscape of the Namhan-Sansung can get to start from exploring the prototype of the village. In order to restore the prototype, it is important to review potential elements and setbacks. Based on the prototype of the Namhan-Sansung village, transitions of village landscape were reviewed and directions of restoration were proposed. Also, an improvement plan was proposed after reviewing problems in system and planning.

• 한국실내디자인학회:학술대회논문집
• /
• 한국실내디자인학회 2006년도 추계학술발표대회 논문집
• /
• pp.156-159
• /
• 2006

Meaningless in such a rapidly grown society to have a conventional and tedious understanding and interpretation of the public only in terms of the relationship of others. This study, therefore, investigates and developed the notion and the importance of the public that has been formed and developed with the urban growth and that has disappeared through modernization. The arument will be focused on how to revitalize the public in the contemporary cities through a right interpretation of the public in the contemporary. The ultimate purpose of the thesis is to propose a design strategy by which the new public sphere will be reconstructed within the contemporary office space.

• Journal of Information Processing Systems
• /
• 제13권1호
• /
• pp.114-127
• /
• 2017

This paper proposes a color image coding algorithm based on shape-adaptive all phase biorthogonal transform (SA-APBT). This algorithm is implemented through four procedures: color space conversion, image segmentation, shape coding, and texture coding. Region-of-interest (ROI) and background area are obtained by image segmentation. Shape coding uses chain code. The texture coding of the ROI is prior to the background area. SA-APBT and uniform quantization are adopted in texture coding. Compared with the color image coding algorithm based on shape-adaptive discrete cosine transform (SA-DCT) at the same bit rates, experimental results on test color images reveal that the objective quality and subjective effects of the reconstructed images using the proposed algorithm are better, especially at low bit rates. Moreover, the complexity of the proposed algorithm is reduced because of uniform quantization.