• Title/Summary/Keyword: 무손실압축

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Improving the Lifetime of NAND Flash-based Storages by Min-hash Assisted Delta Compression Engine (MADE (Minhash-Assisted Delta Compression Engine) : 델타 압축 기반의 낸드 플래시 저장장치 내구성 향상 기법)

  • Kwon, Hyoukjun;Kim, Dohyun;Park, Jisung;Kim, Jihong
    • Journal of KIISE
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    • v.42 no.9
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    • pp.1078-1089
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    • 2015
  • In this paper, we propose the Min-hash Assisted Delta-compression Engine(MADE) to improve the lifetime of NAND flash-based storages at the device level. MADE effectively reduces the write traffic to NAND flash through the use of a novel delta compression scheme. The delta compression performance was optimized by introducing min-hash based LSH(Locality Sensitive Hash) and efficiently combining it with our delta compression method. We also developed a delta encoding technique that has functionality equivalent to deduplication and lossless compression. The results of our experiment show that MADE reduces the amount of data written on NAND flash by up to 90%, which is better than a simple combination of deduplication and lossless compression schemes by 12% on average.

Visually Lossless Image Compression for Digital Cinema Distribution Based on DCI Specification (DCI 규격을 만족하는 디지털시네마 배급을 위한 시각적 무손실 압축 연구)

  • Kim, Chul-Hyun;Paik, Joon-Ki
    • Journal of Broadcast Engineering
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    • v.13 no.1
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    • pp.99-108
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    • 2008
  • This raper analyzes the effect of visually lossless image compression for efficient distribution of digital cinema. Currently, distribution of digital cinema is carried out based on JPEG 2000 standard that has been selected by DCI. We first summarize characteristics of JPEG 2000, and then define the concept of visually lossless coding that plays an important role in digital cinema distribution. We provide a test for JPEG 2000 compression performance according to DCI specification for visually lossless. Based on the experiment, the result satisfies high quality for cinema distribution.

A Robust Sequential Preprocessing Scheme for Efficient Lossless Image Compression (영상의 효율적인 무손실 압축을 위한 강인한 순차적 전처리 기법)

  • Kim, Nam-Yee;You, Kang-Soo;Kwak, Hoon-Sung
    • Journal of Internet Computing and Services
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    • v.10 no.1
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    • pp.75-82
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    • 2009
  • In this paper, we propose a robust preprocessing scheme for entropy coding in gray-level image. The issue of this paper is to reduce additional information needed when bit stream is transmitted. The proposed scheme uses the preprocessing method of co-occurrence count about gray-levels in neighboring pixels. That is, gray-levels are substituted by their ranked numbers without additional information. From the results of computer simulation, it is verified that the proposed scheme could be reduced the compression bit rate by up to 44.1%, 37.5% comparing to the entropy coding and conventional preprocessing scheme respectively. So our scheme can be successfully applied to the application areas that require of losslessness and data compaction.

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A Resolution-Scalable Data Compression Method of a Digital Hologram (디지털 홀로그램의 해상도-스케일러블 데이터 압축 방법)

  • Kim, Yoonjoo;Seo, Young-Ho;Kim, Dong-Wook
    • Journal of Broadcast Engineering
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    • v.19 no.2
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    • pp.174-183
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    • 2014
  • This paper is to propose a scalable video coding scheme for adaptive digital hologram video service for various reconstruction environments. It uses both the light source information and digital hologram at both the sending side and the receiving side. It is a resolution-scalable coding method that scales the resolution, that is, the size of the reconstructed image. The method compresses the residual data for both the digital hologram and the light source information. For the digital hologram, a lossy compression method is used, while for the light source information, a lossless compression method is used. The experimental results showed that the proposed method is superior to the existing method in the image quality at the same compression ratio. Especially it showed better performance than the existing method as the compression ratio becomes higher.