• Title/Summary/Keyword: 허프만

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Design of the Entropy Processor using the Memory Stream Allocation for the Image Processing (메모리 스트림 할당 기법을 이용한 영상처리용 엔트로피 프로세서 설계)

  • Lee, Seon-Keun;Jeong, Woo-Yeol
    • The Journal of the Korea institute of electronic communication sciences
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    • v.7 no.5
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    • pp.1017-1026
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    • 2012
  • Due to acceleration of the IT industry and the environment for a variety of media in modern society, such as real-time video images 3D-TV is a very important issue. These high-quality live video is being applied to various fields such as CCTV footage has become an important performance parameters. However, these high quality images, even vulnerable because of shortcomings secure channel or by using various security algorithms attempt to get rid of these disadvantages are underway very active. These shortcomings, this study added extra security technologies to reduce the processing speed image processing itself, but by adding security features to transmit real-time processing and security measures for improving the present.

A Study on the Cipher JPEG Imag (JPEG 암호화에 관한 연구)

  • 박용범;박종일
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.4
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    • pp.308-312
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    • 2002
  • Recently, Internet is getting more popular and the usage of multimedia contents is getting more increased. Among the multimedia contents, the JPEG format is the most commonly used Image data format but the JPEG format doesn't supply cryptographic methods and access control. In this paper, a cryptographic method for cipher JPEG Image is proposed. This method can supply encryption and decryption using several algorithms such as DES to the JPEG Image data. Huffman table, which is the most important data area for JPEG data coding, is chosen as the coding data. Each method is compared to select the optimal cryptographic method in a certain environment.

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Generation Method of Depth Map based on Vanishing Line using Gabor Filter (Gabor Filter를 이용한 소실선 검출 기반의 깊이 지도 생성 기법)

  • Yoo, Tae-Hoon;Lee, Sang-Hun
    • Journal of the Korea Convergence Society
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    • v.3 no.1
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    • pp.13-17
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    • 2012
  • In this paper, we propose method of generation of depth map using vanishing line and texture. vanishing line is generated by parallel lines in image. For generate vanishing line, show boundary of particular angle through Gabor Filter and extract line through Hough Transform. Initial Depth Map is estimated based on vanisihng line and combine Relative Depth map that generated using Texture Cue. The proposed algorithm advanced due to combine Initial Depth Map and Relative Depth Map.

Multi-quantized Image Compression using Wavelet Transform (다중 양자화를 이용한 웨이블릿 영상압축)

  • Piao, Yong-Ri;Kim, Seok-Tae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.3
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    • pp.453-458
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    • 2006
  • This paper proposed the method for restorable lossy mage compression using wavelet transformation. In order to increase compression efficiency, this algorithm subbands with the wavelet transformation filter after processing the pre-quantizer on the original images. Then, it quantizes its wavelet coefficients by using the Huffman Coding. Comparing to the JPEG or non pre-quantized images, the reconstructed images by the proposed algorithm showed higher PSNR. By applying pre-quantizing process, it will be possible to control the peak errors and it is also expected to be useful at mass image compressions.

REMOTELY SENSEDC IMAGE COMPRESSION BASED ON WAVELET TRANSFORM (Wavelet 변화을 이용한 우리별 수신영상 압축기법)

  • 이흥규;김성환;김경숙;최순달
    • Journal of Astronomy and Space Sciences
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    • v.13 no.2
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    • pp.198-209
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    • 1996
  • In this paper, we present an image compression algorithm that is capable of significantly reducing the vast mount of information contained in multispectral images. The developed algorithm exploits the spectral and spatial correlations found in multispectral images. The scheme encodes the difference between images after contrast/brightness equalization to remove the spectral redundancy, and utilizes a two-dimensional wavelet trans-form to remove the spatial redundancy. The transformed images are than encoded by hilbert-curve scanning and run-length-encoding, followed by huffman coding. We also present the performance of the proposed algorithm with KITSAT-1 image as well as the LANDSAT MultiSpectral Scanner data. The loss of information is evaluated by peak signal to noise ratio (PSNR) and classification capability.

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Licence Plate Recognition Using Improved IAFC Fuzzy Neural Network (개선된 IAFC 퍼지 신경회로망을 이용한 차량 번호판 인식)

  • Lee, Si-Hyun;Choi, Si-Young;Lee, Se-Yul;Kim, Yong-Soo
    • Journal of the Korean Institute of Intelligent Systems
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    • v.19 no.1
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    • pp.6-12
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    • 2009
  • In this paper, we propose a system that extracts licence plate and recognizes numerals in the licence plate. The candidate area of licence plate is extracted using the improved IAFC(Integrated Adaptive Fuzzy Clustering) fuzzy neural network. And the morphological filters are used to reduce noise from the extracted licence plate. The extracted licence plate is standardized using Hough transform and geometric transform. Backpropagation neural network is used to recognize numerals that are separated using the projection technique.

Establishment Threshold Value of Image Realization & Reconstruction of Stoppage Image using Picture Resemblance (닮은꼴을 이용한 영상구현 임계값설정과 정지영상 복원법)

  • Jin, Hyun-Soo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.4
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    • pp.187-194
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    • 2011
  • In this paper, JPEG(Joint Photographic Experts Group) image data video decoding technique is presented, it is Huffman decoding method and fractal image method which is very complexive algorithm and the time required much it to implement this method and the first image is decoded to video frame image. This have defect of overlap decoding and transport work because of impossible to represent objective value of resemblance. The proposed method was calculated the mathematical absolute image resemblance and simplify the moving picture process to reducing the step of moving picture codefying. The results show that smoothed moving picture compared recent methods.

Pre-quantized Image Compression using Wavelet Transform (선 양자화법에 의한 웨이블릿 영상압축)

  • Piao, Yongri;Kim, Seok-Tae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.405-408
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    • 2005
  • This paper proposed the method to images of losses using restorable wavelet transformation. The algorithm proposed in this work stars by processing the pre-quantizer on the original images to organize an image that matches the gray level. The wavelet transformation filter to the original image which is already pre-quantized in order to segment bands. Considering the lowest coding of bands influencing the most to the overall condition of the reconstructed image, it only uses the Huffman coding using prediction. Reconstructed images by proposed algorithm showed higher PSNR when coding images of JPEG or non pre-quantized images. Applying pre-quantizer can control the peak errors and is expected to be useful at mass image compression.

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New Moving Picture Decoding Process using Picture Resemblance (닮은꼴을 이용한 새로운 동영상 디코딩 처리방법)

  • Soo, Jin-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.3
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    • pp.873-879
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    • 2010
  • In this paper, MPEG2(Moving Picture Expert Group 2) image data video decoding technique is presented, it is Huffman decoding method and fractal image method which is very complexive algorithm and have too much times to implement this method. This have defect of overlap decoding and transport work because of impossible to represent objective value of resemblance. The proposed method was calculated the mathematical absolute image resemblance and simplify the moving picture process to reducing the step of moving picture codefying. The results show that smoothed moving picture compared recent methods.

On the Use of Odd-Degree Isogenies for Implementing SIDH-Based Cryptography (SIDH 기반 암호 구현에 대한 홀수 차수 아이소제니 적용)

  • Kim, Suhri;Yoon, Kisoon;Park, Young-Ho
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.31 no.1
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    • pp.19-30
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    • 2021
  • In this paper, when SIDH is instantiated using only 3- and 5-isogeny, we demonstrate which curve is more efficient among the Montgomery, Edwards, and Huff curves. To this end, we present the computational cost of the building blocks of SIDH on Montgomery, Edwards, and Huff curves. We also present the prime we used and parameter settings for implementation. The result of our work shows that the performance of SIDH on Montgomery and Huff curves is almost the same and they are 0.8% faster than Edwards curves. With the possibility of using isogeny of degree other than 3 and 4, the performance of 5-isogeny became even more essential. In this regard, this paper can provide guidelines on the selection of the form of elliptic curves for implementation.