• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2012년도 한국컴퓨터종합학술대회논문집 Vol.39 No.1(C)
• /
• pp.245-247
• /
• 2012

We know that JPEG image format is one of the most popular image formats in the digital area and distribution of digital photographic drawing it is interested frequently in certain types of forensic investigation. In most case, corrupted images are shown gaudiness with the boundary of the corrupted parts. In the paper, we propose a technique to carve correct JPEG images using transformation method and the approach can be used for JPEG image file carving tool development.

• 복식
• /
• 제61권8호
• /
• pp.45-56
• /
• 2011

This study is about the features of hybridization of ethnic-cultural elements in Korean fashion magazines. Its purpose was to embody more creative and newer images in fashion by promoting better mutual understanding of foreign cultures and addressing the issues of fashion design from multicultural perspectives. In doing so, the present study conducted a literature review and analyzed a total of 130 photographic images with any hybrid ethic element from two Korean fashion magazines, Vogue Korea and Harper's Bazaar Korea, issued between 2005 and 2009. The analysis revealed that there were 66 images(50.8%) with a mixture of two different cultures and 64 images(49.2%) with a mixture of three or more different cultures. As seen from the results, the two categories had a similar number of cases. In regional terms, the use of two different cultural elements included a mixture of Asian and Western cultures in 32 images(24.6%), a mixture of Western and African, Middle Eastern or Latin American cultures in 23(17.7%), and a mixture of Western and Russian or European folk cultures in 11(8.5%). In the use of three or more different cultural/national elements, the present study found a mixture of Asian, African, Middle Eastern, Latin American and Western costume items in 20 photo images(15.4%), a mixture of African, Middle Eastern and Latin American elements plus Western costume items in 19 images( 14.6%), a mixture of all regional cultures in 13 photos(10%), and a mixture of Asian ethic cultures plus Western costume items in 12 cases(9.2%). The results of this analysis indicated that the hybridization of ethnic-culture elements in Korean fashion magazines consisted of diverse clothing and accessories from various ethnic groups. The expression of these multi-cultural hybrid images that consists background images and models from different cultures well-portrayed the multi-cultural elements based on total coordination and broke the stereotypical aspects of styling.

• 인간식물환경학회지
• /
• 제22권1호
• /
• pp.53-63
• /
• 2019

The purpose of this study was to investigate the preference of plant environmental images for flower plant consumption. This study came up with a total of four treatments including one image without plants and three images with flower plants (three roses, rose gift, rose garden). We conducted a survey on 104 men and women through the Google (online) survey and analyzed the data. The preference was higher with statistical significance for environmental images with plants than the image without plants. The preference for environmental images of roses was highest in the order of rose gift > rose garden > three roses. As a result of the cross-tabulation analysis, it was found that there was a significant difference in the preference for environmental images of roses according to general characteristics such as educational background and residence type. In terms of educational background, 2-year college graduates showed higher preference for the three environmental images of roses with statistical significance compared to high school graduates, university graduates and masters or higher. As a result of determining the difference in preference according to residential types, residents of multiplex houses showed higher preference for the "rose garden" environment image than residents of detached houses (p < .05). As a result of examining stress and depression in everyday life, 48.1% (the highest) of the respondents answered that they were "under daily stress" and 48.1% (the highest) of the respondents claimed not to be "under much depression". This study investigated the difference in preference according to demographic characteristics and existence of plants, preference in environmental images using roses, correlation with daily stress and depression, and utility of publicity using photographic images of plants.

• 터널과지하공간
• /
• 제21권6호
• /
• pp.439-449
• /
• 2011

터널의 페이스매핑(face mapping)을 신속하고 신뢰성 있게 수행하기 위하여 디지털 사진으로부터 3차원 좌표의 점군(point cloud)을 생성하고 이로부터 절리면의 방향과 간격 및 암질지수(R.Q.D), 절리면 거칠기 등을 분석하였다. 분석결과를 공학적 암반분류 방법인 RMR(Rock Mass Rating)과 Q 시스템에 입력하여 보강방법을 결정하고 터널을 시공하였다. 그 결과 터널 페이스매핑 작업의 안전성을 높이면서, 분석부터 보강작업까지의 시간을 절약하였다. 또 터널 막장면의 디지털 영상과 공학적 암반분류용 정보를 객관적으로 평가하고 필요 시재분석이 가능하도록 보존함으로써 보강등급 결정과 터널보강 방법의 신뢰도를 높였다.

• 대한의용생체공학회:의공학회지
• /
• 제15권2호
• /
• pp.175-182
• /
• 1994

The international standard for digital compression and coding of continuous-tone still image known as JPEG (Joint Photographic Experts Group) standard is investigated for medical image archiving and communication. The JPEG standard has widely been accepted in the areas of electronic image communication, computer graphics, and multimedia applications, however, due to the lossy character of the JPEG compression its application to the field of medical imaging has been limited. In this paper, the JPEG standard is investigated for medical image compression with a series of head sections of magnetic resonance (MR) images (256 and 4096 graylevels, $256 {\times}256$size). Two types of Huffman codes are employed, i. e., one is optimized to the image statistics to be encoded and the other is a predetermined code, and their coding efficiencies are examined. From experiments, compression ratios of higher than 15 were obtained for the MR images without noticeable distortion. Error signal in the reconstructed images by the JPEG standard appears close to random noise. Compared to existing full-frame bit-allocation technique used for radiological image compression, the JPEG standard achieves higher compression with less Gibb's artifact. Feature of the progressive image build-up of the JPEG progressive coding may be useful in remote diognosis when data is transmitted through slow public communication channel.

• 한국통신학회논문지
• /
• 제32권2C호
• /
• pp.113-123
• /
• 2007

유비쿼터스 통신 환경에서는 영상의 다양한 형태의 변환이 필수적인데, 대부분의 디지털 영상은 DCT (Discrete Cosine Transform)를 기반으로 한 JPEG, MPEG 등의 표준 기법을 이용하여 압축되어 저장되어 있다. 본 논문에서는 DCT 영역에서 영상의 크기를 변환시키는 기존의 여러 가지 알고리즘들을 고찰하고 그 성능을 분석하며, 기존의 방법보다 더 우수한 성능을 보이는 DCT 영역에서의 영상 크기 변환 알고리즘을 제안한다. 제안하는 알고리즘은 DCT 영역에서 영상의 임의 크기 변환을 위해 여러 개의 $8{\times}8$ DCT 계수 블록을 변환 비율에 따라 변환식을 통하여 하나의 블록으로 변환하고 최적의 zero-padding 및 truncating을 위한 IDCT의 크기를 정하는 방법을 이용하여 영상 크기 변환의 성능을 높인다. 이것은 화소간의 상관도를 최대한 이용하여 DCT 계수를 구하고, 여기서 얻어진 DCT 계수 블록에서 원하는 비율에 따라 최적의 크기를 구함으로써 성능을 높이는 알고리즘이다. 그 성능을 원 영상과 축소하여 다시 확대시킨 영상의 PSNR 비교를 통하여 확인하였고, 제안하는 알고리즘은 특정 비율의 변환에 있어서 기존의 알고리즘을 포괄할 수 있는 방법임을 확인할 수 있었다.

• International journal of advanced smart convergence
• /
• 제10권2호
• /
• pp.108-122
• /
• 2021

With the development of 3D graphics software and the speed of computer hardware, it is an era that can be realistically expressed not only in movie visual effects but also in console games. In the production of such realistic 3D models, 3D scans are increasingly used because they can obtain hyper-realistic results with relatively little effort. Among the various 3D scanning methods, photogrammetry can be used only with a camera. Therefore, no additional hardware is required, so its demand is rapidly increasing. Most 3D artists shoot as many images as possible with a video camera, etc., and then calculate using all of those images. Therefore, the photogrammetry method is recognized as a task that requires a lot of memory and long hardware operation. However, research on how to obtain precise results with 3D photogrammetry scans is insufficient, and a large number of photos is being utilized, which leads to increased production time and data capacity and decreased productivity. In this study, point cloud data generated according to changes in the number and resolution of photographic images were produced, and an experiment was conducted to compare them with original data. Then, the precision was measured using the average distance value and standard deviation of each vertex of the point cloud. By comparing and analyzing the difference in the precision of the 3D photogrammetry scans according to the number and resolution of images, this paper presents a direction for obtaining the most precise and effective results to 3D artists.

• 한국지리정보학회지
• /
• 제7권4호
• /
• pp.143-154
• /
• 2004

원격탐사는 각종 상업용 위성과 항공사진을 바탕으로 이루어진다. 그러나 이러한 자료는 연구자들이 원하는 시기와 장소에 따라 촬영되는데 자료 획득시, 기상조건 및 경제적 이유로 많은 어려움을 겪고 있다. 이러한 문제점을 해결하고자 본 연구에서는 소형비행기 및 초경량 비행기에 탈부착이 가능한 소형 다중분광 자동 항공촬영시스템(PKNU2)을 개발하였다. PKNU2호는 연구실 자체 보유한 고해상도 가시대역, 적외선대역 카메라를 이용하여 칼라영상 및 적외 영상을 획득하였다. 환경감시 등의 목적으로 칼라 적외 합성영상을 생성, 분석하였으나 그리 만족스러운 결과를 획득하지 못하였다. 또한 PKNU2호가 대용량 촬영은 가능하였지만 데이터 저장시간이 12초로 횡중복률 60%를 만족시키지 못하였다. 현재 우리는 PKNU2호의 단점을 극복하고자 가시대역과 적외선 대역의 자료를 한번에 획득할 수 있 칼라 적외선 분광카메라, 열적외 카메라, 그리고 영상의 실시간 저장이 가능한 MPEG board를 도입하여 헬리콥터에 탈부착이 가능한 소형 다중분광 자동 항공촬영시스템(PKNU3)을 개발하고 있다. 본 연구에서는 본격적인 촬영에 앞서 가치 있는 영상 획득을 위해 센서의 특성 평가를 실시, 센서의 분광 특성 보정 및 렌즈의 기하학적 왜곡 보정을 작업을 실시하였다.

• 패션비즈니스
• /
• 제4권2호
• /
• pp.95-111
• /
• 2000

The purpose of this research is to investigate the concept of the photomontage technique, one of the various photographic techniques, and to analyze the photomontage image through the patterns that appeared in 1990's fashions. Moreover, by making clothes using the photomontage image, the intention of this study to apply the technique in real life is achieved. The results of this thesis for making clothes utilizing image of the photomontage are as followings. First, the photomontage expands the variety of materials that can be used, because the clothes using the photomontage image are able to take any photo images. Second, two different eras can co-exist in a piece of work since a photomontage work can uses two images from different eras. Third, it allows greater adaptability by expressing variety and utility in the making of the casual styles using conventional photo materials. The conclusion of this study is that the clothes appearing in the late 20th century using the photomontage image have been developed corresponding to the accelerated development of photography, machinery, and technical skill in civilization. Trends break away from the conventional expressions of art. This is a new trend and direction in art that will effect culture in the 21st century. The photo montage image would show the possibility of a good unification between human being and machines.

• 천문학회보
• /
• 제36권2호
• /
• pp.90.2-90.2
• /
• 2011

At Kyoto University, a continuous solar full-disk observation in CaII K line had been done during 44 years of 1926 - 1969. The observation was done with a Askania spectroheliograph on daily base. The images were taken on photographic plates. We started a project to archive these image data into a digital database which will be open to the public for scientific researches. One of the scientific usage of the database is to study the long term variation of the solar chromospheres. Since the area of CaII K plage area is a measure of solar chromospheric heating, we can do comparative study of the sunspot cycle and the chromospheric heating cycle of the sun. Another interesting field of scientific utilization of the database is the long term variation of the heating of terrestrial upper atmosphere. As was shown by Yokoyama, Masuda and Sato (2005), the area of the CaII K plage is a good proxy measure of solar EUV irradiation onto the upper atmosphere of the earth. Thus the completion of our database will serve to supply a basic and long-span data for upper atmospheric heating issues by the cooperative study with the Inter-university Upper atmosphere Global Observation NETwork (IUGONET) developed in Japan.