• The Journal of the Korea Contents Association
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• 제13권8호
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• pp.44-51
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• 2013

Raster operations are widely used to display full-color graphics images (or pixmaps) and single-color images (or bitmaps). These features are strongly needed for image processing applications and font output. However, current mobile graphics platforms, including OpenGL ES hardware implementations, do not directly support these features. To fully support those raster operations on the mobile graphics platforms, we interpreted the graphics images as a set of 3D points, and processed those 3D points through the typical 3D geometry pipelines, in a full-software implementation. Our implementation shows sufficient execution speeds, and passed the official conformance tests to show its correctness.

• Journal of Korea Multimedia Society
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• 제9권11호
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• pp.1455-1464
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• 2006

In this paper, we propose an adaptive image enhancement algorithm. The proposed algorithm is classified with the MIE technique for intensity enhancement of input image and MSE techniques for saturation enhancement. The MIE technique is proposed to control the gamut mapping problem and a sudden change in image-brightness while Luminance signal is processing, The MSE techniques are proposed to control de-saturation or over-saturation while chrominance signal is processing. The proposed algorithm is focused on processing preference color for human vision in order to generate better image quality than the algorithms focused on processing uniformly to whole images, This algorithm can be applied to a monitor, TV and other display devices for high quality image.

• The KIPS Transactions:PartB
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• 제17B권3호
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• pp.197-206
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• 2010

High-quality and low-price digital printing devices are nowadays abused to print or forge official documents and bills. Identifying color laser printers will be a step for media forensics. This paper presents a new method to identify color laser printers with printed color images. Since different printer companies use different manufactural systems, printed documents from different printers have little difference in visual. Analyzing this artifact, we can identify the color laser printers. First, high-frequency components of images are extracted from original images with discrete wavelet transform. After calculating the gray-level co-occurrence matrix of the components, we extract some statistical features. Then, these features are applied to train and classify the support vector machine for identifying the color laser printer. In the experiment, total 2,597 images of 7 printers (HP, Canon, Xerox DCC400, Xerox DCC450, Xerox DCC5560, Xerox DCC6540, Konica), are tested to classify the color laser printer. The results prove that the presented identification method performs well with 96.9% accuracy.

• Proceedings of the Korea Contents Association Conference
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• 한국콘텐츠학회 2006년도 추계 종합학술대회 논문집
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• pp.242-245
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• 2006

This paper addresses an image fingerprinting scheme for the print-to-capture model performed by a photo printer and digital camera. When capturing an image by a digital camera, various kinds of distortions such as noise, geometrical distortions, and lens distortions are applied slightly and simultaneously. In this paper, we consider several steps to extract fingerprints from the distorted image in print-and capture scenario. To embed ID into an image as a fingerprint, multi-bits embedding is applied. We embed 64 bits ID information as a fingerprint into spatial domain of color images. In order to restore a captured image from distortions a noise reduction filter is performed and a rectilinear tiling pattern is used as a template. To make the template a multi-bits fingerprint is embedded repeatedly like a tiling pattern into the spatial domain of the image. We show that the extracting is successful from the image captured by a digital camera through the experiment.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제20권2호
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• pp.20-25
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• 2019

Most multimedia signals contain image data, so the problem of efficient processing and transmitting the image data is an important task of the information society. This paper proposes a compression algorithm that reduces the color bits according to importance using YUV color space among the various methods of compressing image data. 4: 2: 2 subsampling is the standard in the field of video. Using the color information and the characteristics of the human retina, YUV color data was reduced by 4: 2: 2 subsampling. The YUV images and RGB images can be interconverted using the transformation matrix. The image data was converted into color space by YUV, and the relatively low U and V bits were subjected to a downscaling operation. The data was then compressed through 4: 2: 2 subsampling. The performance of the proposed algorithm was compared and analyzed by a comparison with existing methods. As a result of the analysis, it was possible to compress the image without reducing the information of the low importance color element and without significant deterioration in the quality compared to the original.

• The Optical Journal
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• 통권104호
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• pp.18-22
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• 2006

2006년 복사기를 포함한 사무기기 시장의 화두는 컬러화와 사무환경의 솔루션화에 맞춰진다. 이미 지난해부터 OA 3사는 사무기기 업체로서의 이미지를 과감히 버리고‘솔루션 제공및 컨설팅’업체로 변신을 선언하고 단순 기기 판매방식에서 벗어나 사무환경과 관련해 비용과 생산성을 따져‘맞춤 환경’을 컨설팅 하는‘종합오피스 솔루션 업체’로 거듭나고 있다. 복사기 시장이 디지털화되면서 최근 4년간 부동의 8만여대 규모를 이어가면서 업체들은 새로운 수익원을 찾아 나설 수밖에 없었고 결국 솔루션을 통한 마케팅이 시장에서의 성패를 좌우하는‘열쇠’로 판단한 것이다. 더욱이 솔루션은 역으로 하드웨어 판매를 촉진하는 부수적인 효과도 올리고 있어 메이커들은 솔루션 마케팅에 더욱 집중할 것으로 보인다.

• Proceedings of the IEEK Conference
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1011-1012
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• 2008

Image quality analysis has been carried out for both monochrome and colour print images obtained by a calibrated low-end scanner. The analysis method is based upon ISO13660 for monochrome images and additional criteria for colour quality that we have defined. We have compared performance of the calibrated scanner with that of a high-end spectrophotometer in terms of several aspects such as line and large area. They have provided similar results without significant discrepancy.

• Proceedings of the Korea Contents Association Conference
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• 한국콘텐츠학회 2014년도 추계 종합학술대회 논문집
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• pp.175-176
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• 2014

영화<씬 시티>는 프랭크밀러 원작의 만화 '씬 시티'를 영화로 만든 작품이다. 흑백영상과 조명, 원색의 컬러와 뒤에 배경을 컴퓨터그래픽으로 배치함으로써 표현주의를 바탕으로 한 필름 느와르 장르와 원작의 컷을 사용하여 그래픽 노블 이미지를 영상으로 연출하였다. <씬 시티>를 분석하여 이를 통한 영상 미학적 특성과 비쥬얼 스토리텔링에 대해 살펴 볼 수 있는 연구라 사료된다.

• 프린팅코리아
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• 제8권2호
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• pp.90-91
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• 2009

복합기로 강한 이미지를 갖고 있는 캐논코리아에 상업인쇄, POD, 출력시장을 담당하고 있는 부서가 있다. 바로 P&S사업팀 (Printing & Soultion)이다. P&S사업팀은 캐논의 다양한 제품군 중에서 고생산성 장비 및 대형프린터와 관련된 솔루션을 전담하고 있다. 현재 총인원 16명으로 구성되어 있는 P&S팀은 직판영업, 솔루션 기술지원, 서비스를 한 팀으로 구성하여 통합적인 기능을 발휘하는데 초점을 맞췄다. 구성원 모두가 시스코의 네트워크 자격증인 CCNA를 보유하고 있을 뿐 아니라 사내외 CMS 전문 강좌를 수료한 컬러 제품 전문가여서 고객들의 현장 요구에 빠르게 대응하는 것은 물론이고 거래처 환경에서 발생되는 다양한 문제를 해결하고 솔루션도 제안하는 등 컨설턴트로서의 역할도 충실하게 수행하고 있다.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (B)
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• pp.685-687
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• 2004

MPEG-7은 형태나 질감, 컬러 등의 속성 및 분포 등을 나타내기 위한 여러 가지 기술자(descriptor)들을 제공함으로써 검색의 효율을 높일 수 있는 방법을 포함한 표준화를 제시하고 있다. 본 논문에서는 영상의 특징을 MPEG-7의 설러 기술자중 에지 히스토그램 기술자(Edge Histogram Descriptor)를 통해 얻는다 추출된 에지 특징을 이용하여 영상의 정해진 각 역의 전체 후보영상과의 상대적 유사도를 비교하여 검색에 반영함으로써 검색의 효율을 향상시키는 방법을 제안한다.