• Title/Summary/Keyword: JPEG format

Search Result 62, Processing Time 0.023 seconds

A Low-Complexity and High-Quality Image Compression Method for Digital Cameras

  • Xie, Xiang;Li, Guolin;Wang, Zhihua
    • ETRI Journal
    • /
    • v.28 no.2
    • /
    • pp.260-263
    • /
    • 2006
  • This letter proposes a new near-lossless image compression method with only one line buffer cost for a digital camera with Bayer format image. For such format data, it can provide a low average compression rate (4.24bits/pixel) with high-image quality (larger than 46.37dB where the error of every pixel is less than two). The experimental results show that the near-lossless compression method has better performance than JPEG-LS (lossless) with ${\delta}$ = 2 for a Bayer format image.

  • PDF

Performance Comparison of the JPED and Full Frame Bit Allocation Techniques for Medical Image Compression

  • Ahn, C.B.;Ro, D.W.;Lee, J.S.
    • Proceedings of the KOSOMBE Conference
    • /
    • v.1992 no.05
    • /
    • pp.58-63
    • /
    • 1992
  • The discrete cosine transform (DCT)-based progressive coding standard proposed by the International Standardization Orgnnization (ISO) Joint Photographic Experts Groups (JPEG) is investigated for medical image compression and the performance of the JPEG is compared to that of the full-frame bit-allocation (FFBA) technique. From the comparison, the JPEG standard appeals superior to the FFBA technique in the following aspects: 1) JPEG achieves higher compression than the FFBA technique with less mean square error. 2) Less Gibb's artifact is observed in the compressed images by the JPEG. 3) Computational time for the JPEG is about one-fourth or the FFBA technique. Other attractive points of the JPEG include: Implementation of the JPEG with VLSIs is commercially available in relative low price and the JPEG compression format can easily be interchangeable with other applications.

  • PDF

Implementation of Header Parser Module for JPEG Baseline Decoder (JPEG 베이스라인 디코더용 헤더 파서 모듈 구현)

  • Noh, Si-Chan;Sonh, Seung-Il;Oh, Seung-Ho;Lee, Min-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2008.05a
    • /
    • pp.747-750
    • /
    • 2008
  • JPEG(Joint Photographic Expert Group)은 손실 압축 기법을 사용하여 데이터 양을 20:1 이상으로 현저히 줄이면서도 원 영상과 거의 유사한 영상을 복원할 수 있도록 해주기 때문에, 요즘 디지털 카메라 및 휴대폰 등 영상을 저장할 매 대부분 Exif(Exchangeable image file format)로 JPEG 압축형식을 널리 사용하고 있다. 본 논문은 JPEG 베이스라인 모드로 압축되어진 영상의 디코딩 단계에서 필요한 비계층형 헤더를 파싱하는 모듈의 기능을 소프트웨어로 모델링하고 VHDL을 이용하여 회로를 합성하고 동작을 검증하였다. 설계 결과 Xilinx xc3s1000 fg676-4 환경에서 154.488MHz의 동작속도를 나타내었고, JPEG 디코더의 고속 데이터 처리에 적응 가능하다.

  • PDF

Quantized DCT Coefficient Category Address Encryption for JPEG Image

  • Li, Shanshan;Zhang, Yuanyuan
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.10 no.4
    • /
    • pp.1790-1806
    • /
    • 2016
  • Digital image encryption is widely used for image data security. JPEG standard compresses image with great performance on reducing file size. Thus, to encrypt an image in JPEG format we should keep the quality of original image and reduced size. This paper proposes a JPEG image encryption scheme based on quantized DC and non-zero AC coefficients inner category scrambling. Instead of coefficient value encryption, the address of coefficient is encrypted to get the address of cipher text. Then 8*8 blocks are shuffled. Chaotic iteration is employed to generate chaotic sequences for address scrambling and block shuffling. Analysis of simulation shows the proposed scheme is resistant to common attacks. Moreover, the proposed method keeps the file size of the encrypted image in an acceptable range compared with the plain text. To enlarge the cipher text possible space and improve the resistance to sophisticated attacks, several additional procedures are further developed. Contrast experiments verify these procedures can refine the proposed scheme and achieve significant improvements.

File Carving: JPEG Image Fragmentation Point Detection for Digital Forensics (파일 카빙: 디지털 포렌식을 위한 JPEG 이미지 단편화 지점 감지)

  • Lkham, Nurzed;Park, Dong-Joo
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2012.06c
    • /
    • 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.

A Study on Integrated Media using MAF for Photo Album (사진앨범을 위한 MAF 기반 통합 미디어에 관한 연구)

  • Cho, Jun Ho;Yang, Seungji;Jin, Sung Ho;Ro, Yong Man;Kim, Sang-Kyun
    • Journal of Broadcast Engineering
    • /
    • v.10 no.3
    • /
    • pp.436-450
    • /
    • 2005
  • In this paper we propose an integrated media format for a photo album including media resources and corresponding meta-data The main purpose of the integrated media is to be more reusable meta-data and to facilitate constructing a photo album from a large number of photo images as well. The proposed media format is based on MAF(multimedia Application Format) which is recently going on progress in MPEG standards. In this paper, we propose the integrated media consisting of JPEG data and content-based meta-data based on MPEG-7 MDS. We verified the usefulness of the proposed media through experiments with implementation of encoder and photo MAF player for the MAF-based media format.

Radiology Teaching Files on the Internet (인터넷상에 올려진 Radiology Teaching File에 관한 연구)

  • Lim Eun-Chung;Kim Eun-Kyung
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
    • /
    • v.26 no.2
    • /
    • pp.201-210
    • /
    • 1996
  • There is increasing attention about radiology teaching files on the Internet in the field of diagnostic radiology. The purpose of this study was to aid in the creation of new radiology teaching file by analysing the present radiology teaching file sites on the Internet with many aspects and evaluating images on those sites, using Macintosh IIci computer, 28.8kbps TelePort Fax/Modem, Netscape Navigator 2.0 software The results were as follow : 1. Analysis of radiology teaching file sites (l) Country distribution was the highest in USA(57.5%). (2) Average number of cases was 186 cases and radiology teaching file sites with search engine were 9 sites (22.5%). (3) At the method of case arrangement, anatomic area type and diagnosis type were found at the 10 sites(25%) each, question & answer type was found at the 9 sites(22.5%). (4) Radiology teaching file sites with oro-maxillofacial disorder were 9 sites(22.5%). (5) At the image format, GIF format was found at the 14 sites(35%). and ]pEG format found at the 14 sites(35%). (6) Created year was the highest in 1995(43.7%). (7) Continuing case upload was found at the 35 sites(87.5%). 2. Evaluation of images on the radiology teaching files (l) Average file size of GIF format (71 Kbyte) was greater than that of JPEG format(24 Kbyte). (p<0.001) (2) Image quality of GIF format was better than that of JPEG format. (p<0.001).

  • PDF

The Mobile Terminal System Implementation of Medical Imaging based on Motion-JPEG

  • Kim, Jae-Joon;Jung, Dae-Wha
    • Journal of Korea Multimedia Society
    • /
    • v.12 no.12
    • /
    • pp.1701-1709
    • /
    • 2009
  • The mobile terminal system plays a key role in medical industries which require in fast and accurate diagnosis from heterogeneous acquisition equipment. The demand for PACS (picture archiving and communication systems) has continued to increase in major hospitals and private clinics. Patient care depends on how fast the medical imaging system provides images and how accurately the images are interpreted by physicians. In this paper, we propose an efficient method to decipher the hundreds of images required by physicians to accurately diagnose patients. By exploring Motion- JPEG (M-JPEG), this paper has demonstrates the possibilities for efficient management of medical images with a newly designed image file format and improvement in imaging diagnoses through the replaying of moving pictures of a patient in a mobile environment.

  • PDF

An Analysis on RAW File Format of DSLR Cameras (DSLR 카메라의 RAW 파일 포맷 분석)

  • Ro, Kwang-Hyun
    • Proceedings of the Korean Society of Computer Information Conference
    • /
    • 2009.01a
    • /
    • pp.89-92
    • /
    • 2009
  • 최근 일반인들에게 널리 보급되고 있는 DSLR 디지털 카메라로 촬영되는 정지 이미지는 범용의 JPEG 포맷이나 제조사별 독자적인 RAW 파일 포맷으로 저장매체에 저장된다. 이와 함께 PMP 등의 휴대용 멀티미디어 기기를 활용하여 촬영된 RAW 파일 포맷을 재생 및 확인하기 위한 요구가 증대되고 있지만, RAW 파일 포맷이 디지털 카메라 제조사별로 다르고, 해당 포맷에 대한 구체적인 정보가 공개되지 않는 이유로 대부분의 휴대용 멀티미디어 기기에서 RAW 파일 재생 기능을 지원하지 못하고 있는 실정이다. 본 연구에서는 RAW 파일 포맷을 분석하여 향후 임베디드 멀티미디어 기기에서 모든 RAW 파일 포맷을 지원할 수 있는 라이브러리 구축을 위한 사전 작업을 수행하였다. Cannon의 CRW, CR2 포맷과 Nikon의 NEF 포맷을 분석한 결과를 설명한다. 분석 결과를 바탕으로 RAW 파일 포맷에서 JPEG 파일음 성공적으로 추출하였다. MRW, PEF, DCR, DNG 등의 RAW 파일 포맷을 추가로 분석하여 모든 RAW 파일을 재생한 수 있는 임베디드 장비 및 PC용 RAW 파일 재생 라이브러리를 구축할 것이다.

  • PDF

A study on Color Management Application in Digital Image (디지털 이미지의 컬러 매니지먼트 적용에 관한 연구)

  • Cho, Young-Kwon;Koo, Chul-Whoi;Cho, Ga-Ram
    • Journal of the Korean Graphic Arts Communication Society
    • /
    • v.22 no.2
    • /
    • pp.163-178
    • /
    • 2004
  • In this study, the CIE RGB color space which was one of the most popular device-dependent application program in digital image processing was adopted to make the profile with the device information. The profile was applied to the digital image of a JPEG file format. The result was compared with the color reproduction of another digital image of a JPEG file format, which was made in the e-sRGB color space that had the color spaces allocated to each reproduced color of an image and device-independent colors. In this way it was investigated which color space was more appropriate for digital image processing for web printing and if the e-sRGB color space was good as a color management tool that didn't depend on a device in processing a digital image for web printing.

  • PDF