포토 스캐닝 기술을 기반으로 한 3D 모델링 제품디자인 프로세스에 관한 연구

이준상 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.11

그래픽스 분야의 제품모델링 제작기술은 급속하게 발전하고 있고 3차원 데이터 응용과 활용성은 계속 증가하고있다. 제품디자인 제작에 있어 3차원 모델링 제작에는 많은 시간이 소요된다. 최근 역설계 방식은 3D 데이터의 응용과 제작시간단축으로 활용성이 크다. 본 연구는 영상데이터 기반으로 포토메트리를 이용하여 3차원 포인트 클라우드 및 메쉬 데이터를 추출하고 이를 응용하여 제품의 1차 시안을 제작한다. 디자인 수정에 중점을 두어 2차 시안이 제작되었으며 3차 시제품 제작을 위한 3D 프린팅 작업을 진행한다. 이러한 제품디자인 제작과정에서 영상데이터의 활용과 가능성 및 3D 모델링 제작시간의 단축, 효율적인 프로세스를 제시한다. 또한 제품디자인 환경변화에 대응하기위한 신제품 개발 프로세스 시스템의 모델을 제안한다. Product modeling technology for graphics is rapidly developing. And 3D data application and usability areincreasing.modeling of product design is a very important factor in constructing. 3D modeling in product design takes alot of production time. Recently, the reverse design method is very useful because of application of 3D data andshortening of production time. In this study, first, 3D point cloud and mesh data are generated using photographs basedon image data. The second is to modify the design and the third is to make the prototype with the 3D printer. Thisproduct design and production process suggests the utilization and possibility of image data, the shortening of 3Dmodeling production time and efficient processes. Also, the product design process proposes a model of a new productdevelopment system to adapt to the production environment.

촬영 각도에 따른 3D 모델 복원 품질 비교 연구 : 포토그래메트리를 중심으로

임재현,이승빈,소요환 한국디지털콘텐츠학회 2023 한국디지털콘텐츠학회논문지 Vol.24 No.1

3D scanning photogrammetry technology based on image analysis has a history as long as that of photography for about 150 years. Graphic processors and cameras have also achieved dramatic performance developments in the same way as the long history and progressing. However, non-standardized imaging processes are accompanied by problems such as structural defects in the reconstructed object and the generation of noise. In this research, first, we will model and 3D print the terracotta army object used in the actual measurement data (Ground Truth). Second, in order to derive the optimal shooting method, we developed a table 3D scanning system that rotates around a total of two axes, the vertical axis and the horizontal axis and Get photo data. Finally, the acquired data are compared and analyzed for quality and similarity using a C2M (Cloud-to-Mesh Distances) quantitative comparison algorithm. 높은 비용과 기술적 전입 장벽으로 인해 건축 또는 토목 분야에서 측량을 위해 한정적으로 사용되어온 이미지 분석 기반 3D 스캔 방식 포토그래메트리(Photogrammetry) 기술은 약 150년의 사진 만큼이나 오랜 역사를 가지고 있다. 긴 역사만큼 그래픽 프로세서와 카메라 또한 비약적인 성능 발전을 이루었는데, 포토그래메트리 기술은 이와 함께 건축, 토목뿐만이 아닌 다양한 분야에 활용되고 있고 실제로 다수의 포토그래메트리 기술 기반 3D 모델 복원 과정에 대한 연구가 진행되고 있다. 하지만 표준화되지 않은 촬영 프로세스로 인해 복원 물체의 구조적 결함이나 노이즈(Noise)의 발생과 같은 문제점이 수반된다. 본 연구에서는 첫째, 실측 자료(Ground Truth)로 쓰일 병마용(兵馬俑) 오브젝트를 모델링하고 3D 프린팅한다. 둘째, 최적의 촬영 방법을 도출하기 위해 세로축과 가로축, 총 두 축을 중심으로 회전하는 테이블 3D 스캐닝 시스템을 개발하고, 해당 시스템에서 스마트폰 카메라를 통해 다각도에서 대상 물체의 사진 데이터를 획득한다. 마지막으로는 획득한 데이터를 C2M(Cloud-to-Mesh Distances) 정량적 비교 알고리즘을 사용하여 품질과 유사도를 비교‧분석한다.

A Study of Utilizing 2D Photo Scan Technology to Efficiently Design 3D Models

Dawei Guo,Jeanhun Chung 한국디지털정책학회 2017 디지털융복합연구 Vol.15 No.7

A Study of Utilizing 2D Photo Scan Technology to Efficiently Design 3D Models

곽대위,정진헌 한국디지털정책학회 2017 디지털융복합연구 Vol.15 No.7

Generally, in special effect video and 3D animation design process, character and background’s 3D model is built by 3D program like MAYA or 3DS MAX. But in that manual modeling mode, model design needs much time and costs much money. In this paper, two experimental groups are set to prove use 2D photo scan modeling mode to build 3D model is effective and advanced. The first experimental group is modeling the same object by different experimental setting. The second experimental group is modeling the same background by different experimental setting. Through those two experimental groups, we try to find an effective design method and matters need attention when we use photo scan design mode. We aim to get the model from whole experiment and prove photo scan modeling mode is effective and advanced.

A New True Ortho-photo Generation Algorithm for High Resolution Satellite Imagery

Bang, Ki-In,Kim, Chang-Jae The Korean Society of Remote Sensing 2010 大韓遠隔探査學會誌 Vol.26 No.3

Ortho-photos provide valuable spatial and spectral information for various Geographic Information System (GIS) and mapping applications. The absence of relief displacement and the uniform scale in ortho-photos enable interested users to measure distances, compute areas, derive geographic locations, and quantify changes. Differential rectification has traditionally been used for ortho-photo generation. However, differential rectification produces serious problems (in the form of ghost images) when dealing with large scale imagery over urban areas. To avoid these artifacts, true ortho-photo generation techniques have been devised to remove ghost images through visibility analysis and occlusion detection. So far, the Z-buffer method has been one of the most popular methods for true ortho-photo generation. However, it is quite sensitive to the relationship between the cell size of the Digital Surface Model (DSM) and the Ground Sampling Distance (GSD) of the imaging sensor. Another critical issue of true ortho-photo generation using high resolution satellite imagery is the scan line search. In other words, the perspective center corresponding to each ground point should be identified since we are dealing with a line camera. This paper introduces alternative methodology for true ortho-photo generation that circumvents the drawbacks of the Z-buffer technique and the existing scan line search methods. The experiments using real data are carried out while comparing the performance of the proposed and the existing methods through qualitative and quantitative evaluations and computational efficiency. The experimental analysis proved that the proposed method provided the best success ratio of the occlusion detection and had reasonable processing time compared to all other true ortho-photo generation methods tested in this paper.

A New True Ortho-photo Generation Algorithm for High Resolution Satellite Imagery

( Ki In Bang ),( Chang Jae Kim ) 대한원격탐사학회 2010 大韓遠隔探査學會誌 Vol.26 No.3

Ortho-photos provide valuable spatial and spectral information for various Geographic Information System (GIS) and mapping applications. The absence of relief displacement and the uniform scale in ortho-photos enable interested users to measure distances, compute areas, derive geographic locations, and quantify changes. Differential rectification has traditionally been used for ortho-photo generation. However, differential rectification produces serious problems (in the form of ghost images) when dealing with large scale imagery over urban areas. To avoid these artifacts, true ortho-photo generation techniques have been devised to remove ghost images through visibility analysis and occlusion detection. So far, the Z-buffer method has been one of the most popular methods for true ortho-photo generation. However, it is quite sensitive to the relationship between the cell size of the Digital Surface Model (DSM) and the Ground Sampling Distance (GSD) of the imaging sensor. Another critical issue of true ortho-photo generation using high resolution satellite imagery is the scan line search. In other words, the perspective center corresponding to each ground point should be identified since we are dealing with a line camera. This paper introduces alternative methodology for true ortho-photo generation that circumvents the drawbacks of the Z-buffer technique and the existing scan line search methods. The experiments using real data are carried out while comparing the performance of the proposed and the existing methods through ualitative and quantitative evaluations and computational efficiency. The experimental analysis proved that the proposed method provided the best success ratio of the occlusion detection and had reasonable processing time compared to all other true ortho-photo generation methods tested in this paper.

A New True Ortho-photo Generation Algorithm for High Resolution Satellite Imagery

방기인,김창재 대한원격탐사학회 2010 大韓遠隔探査學會誌 Vol.26 No.3

Ortho-photos provide valuable spatial and spectral information for various Geographic Information System (GIS) and mapping applications. The absence of relief displacement and the uniform scale in ortho-photos enable interested users to measure distances, compute areas, derive geographic locations, and quantify changes. Differential rectification has traditionally been used for ortho-photo generation. However, differential rectification produces serious problems (in the form of ghost images) when dealing with large scale imagery over urban areas. To avoid these artifacts, true ortho-photo generation techniques have been devised to remove ghost images through visibility analysis and occlusion detection. So far, the Z-buffer method has been one of the most popular methods for true ortho-photo generation. However, it is quite sensitive to the relationship between the cell size of the Digital Surface Model (DSM) and the Ground Sampling Distance (GSD) of the imaging sensor. Another critical issue of true ortho-photo generation using high resolution satellite imagery is the scan line search. In other words, the perspective center corresponding to each ground point should be identified since we are dealing with a line camera. This paper introduces alternative methodology for true ortho-photo generation that circumvents the drawbacks of the Z-buffer technique and the existing scan line search methods. The experiments using real data are carried out while comparing the performance of the proposed and the existing methods through qualitative and quantitative evaluations and computational efficiency. The experimental analysis proved that the proposed method provided the best success ratio of the occlusion detection and had reasonable processing time compared to all other true ortho-photo generation methods tested in this paper.

사진가를 위한 디지털 프린팅 프로세스 비교연구

유병욱 한국사진학회 2004 AURA Vol.0 No.11

In these days, digital photograph technology is widely spreading to professional photographers who doubted its quality. So, industries suggest a lot of printing method to satisfy them. In this paper, we compared many printing method and suggest best way to get best result. To compare each methods and printers objectively, we printed same file by printers and use densitometer to measure density of each prints. For subjective comparison, we printed pictures which taken by professional photographers and analyzed visually. In the result. Each printing method has a good point and a weak point. But. each method is good enough to satisfy professionals. So. You may choose the right method by purpose. Of course, Improvement of printing method will go on, but in this time when you feel the performance of printing equipment is enough. Qualities of the final prints are decided by ability of equipment's operation.

Coronary CT 검사시 SFOV 변화에 따른 환자선량 평가

남윤철(Yoon Chul Nam),김부환(Boo Hwan Kim),이민영(Min Young Lee),신설경(Seol Kyung Shin),김문찬(Moon Chan Kim),한동균(Dong Kyoon Han) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1

Purpose The radiation dose in coronary study is high compared with other CT examination. Patient dose in CT is usually expressed in terms of the organ dose and effective dose. The purpose of this study is to evaluate patient organ dose and effective dose vary with scan fiend of view in coronary CT examination. Materials and Methods Organ dose was actually measured by using anthropomorphic phantom and Rapido-Photo-Luminescent(RPL) Glass. Effective dose measured by using ion chamber system. Results The survey on a patient dose showed that the organ dose was 98mGy in the heart part and 93mGy in the Lt. lung part and 63mGy in the Rt. lung part and 98mGy in the Lt. breast part and 75mGy in the Rt. breast part. Effective dose was 16.1mSv. Organ dose was decreased from 32.3% to 40.9% in used SS, S, M(SFOV) examination, compared to used L, LL(SFOV) examination. Effective dose was decreased 39.5% in used SS, S, M(SFOV) examination, compared to used L, LL(SFOV) examination. Conclusion As a conclusion, the radiation dose was very high dose in coronary study. Future research should be directed to identify the least amount of radiation required in CT scans to ensure that diagnostic performance is not significantly compromised.

Research on Technology Production in Chinese Virtual Character Industry

Pan, Yang,Kim, KiHong,Yan, JiHui The Institute of Internet 2022 International Journal of Internet, Broadcasting an Vol.14 No.4

The concept of Virtual Character has been developed for a long time with people's demand for cultural and entertainment products such as games, animations, and movies. In recent years, with the rapid development of concepts and industries such as social media, self-media, web3.0, artificial intelligence, virtual reality, and Metaverse, Virtual Character has also expanded new derivative concepts such as Virtual Idol, Virtual YouTuber, and Virtual Digital Human. With the development of technology, people's life is gradually moving towards digitalization and virtualization. At the same time, under the global environment of the new crown epidemic, human social activities are rapidly developing in the direction of network society and online society. From the perspective of digital media content, this paper studies the production technology of Virtual Character related products in the Chinese market, and analyzes the future development direction and possibility of the Virtual Character industry in combination with new media development directions and technical production methods. Consider and provide reference for the development of combined applications of digital media content industry, Virtual Character and Metaverse industry.