• Title, Summary, Keyword: Differential Coding

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Efficient Hardware Implementation of Real-time Rectification using Adaptively Compressed LUT

  • Kim, Jong-hak;Kim, Jae-gon;Oh, Jung-kyun;Kang, Seong-muk;Cho, Jun-Dong
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.16 no.1
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    • pp.44-57
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    • 2016
  • Rectification is used as a preprocessing to reduce the computation complexity of disparity estimation. However, rectification also requires a complex computation. To minimize the computing complexity, rectification using a lookup-table (R-LUT) has been introduced. However, since, the R-LUT consumes large amount of memory, rectification with compressed LUT (R-CLUT) has been introduced. However, the more we reduce the memory consumption, the more we need decoding overhead. Therefore, we need to attain an acceptable trade-off between the size of LUT and decoding overhead. In this paper, we present such a trade-off by adaptively combining simple coding methods, such as differential coding, modified run-length coding (MRLE), and Huffman coding. Differential coding is applied to transform coordinate data into a differential form in order to further improve the coding efficiency along with Huffman coding for better stability and MRLE for better performance. Our experimental results verified that our coding scheme yields high performance with maintaining robustness. Our method showed about ranging from 1 % to 16 % lower average inverse of compression ratio than the existing methods. Moreover, we maintained low latency with tolerable hardware overhead for real-time implementation.

Performance Evaluations of the Handwritten Signal Coding Techniques (필화신호 부호화 방식의 성능평가)

  • Ho, Kwang-Chun;Won, Young-Joo;Ryoo, Keun-Ho;Lee, Jong-Su
    • Proceedings of the KIEE Conference
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    • pp.701-706
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    • 1989
  • This study has been aimed to analize and evaluate the performance of the coding algorithms for the handwritten signals such as the telewriting systems. Zone Coding and Differential Chain Coding algorithms have been analized and evaluated on the basis of time and space complexities. According to the simulation results, Zone Coding algorithm has shown better decoding performance from the viewpoint of the Root Mean Square decoding errors, but Differential Chain Coding algorithm has shown better data compression ratio and flexibility of its usage, along with its moderate decoding RMS errors.

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Differential-Average Transmitted Reference Ultra-Wideband Communication Systems (Differential-Average Transmitted Reference Ultra-Wideband 통신 시스템)

  • Kim, Se-Kwon;Kim, Jae-Woon;Park, Young-Jin;Lee, Soon-Woo;Kim, Yong-Hwa;Shin, Yo-An
    • Proceedings of the IEEK Conference
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    • pp.309-310
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    • 2008
  • In this paper, we propose a novel D-ATR (Differential-Average Transmitted Reference) scheme for UWB (Ultra Wide Band) based on impulse radio. The proposed scheme utilizing differential coding at transceiver, does not cause half loss of data rate unlike the conventional TR (Transmitted Reference) and ATR (Average TR) systems which transmit additional reference signals. In addition, the proposed scheme may provide improved BER (Bit Error Rate) performance by averaging the received reference signals like the conventional ATR. The proposed D-ATR receiver produces the averaged reference template by considering both the detected data bit and the differential coding rule.

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Pilot-Based Coding Scheme for Parametric Stereo in Enhanced aacPlus

  • Pang, Hee-Suk
    • ETRI Journal
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    • v.31 no.5
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    • pp.613-615
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    • 2009
  • We propose a pilot-based coding (PBC) scheme for lossless bit rate reduction of parametric stereo (PS) in enhanced aacPlus. It uses PBC in addition to the existing frequency and time differential coding to encode and decode PS parameter indexes. We also design optimal Huffman codebooks (HCBs) for PBC in the proposed scheme. Experiments show that the proposed scheme is superior to the original coding scheme, where both the new coding structure and the optimal HCBs contribute to the bit rate reduction.

Scalable Coding of Depth Images with Synthesis-Guided Edge Detection

  • Zhao, Lijun;Wang, Anhong;Zeng, Bing;Jin, Jian
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.10
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    • pp.4108-4125
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    • 2015
  • This paper presents a scalable coding method for depth images by considering the quality of synthesized images in virtual views. First, we design a new edge detection algorithm that is based on calculating the depth difference between two neighboring pixels within the depth map. By choosing different thresholds, this algorithm generates a scalable bit stream that puts larger depth differences in front, followed by smaller depth differences. A scalable scheme is also designed for coding depth pixels through a layered sampling structure. At the receiver side, the full-resolution depth image is reconstructed from the received bits by solving a partial-differential-equation (PDE). Experimental results show that the proposed method improves the rate-distortion performance of synthesized images at virtual views and achieves better visual quality.

Multi-Valued Image Entropy Coding for input-width reduction of LCD source drivers

  • Sasaki, Hisashi;Arai, Tooru;Hachiuma, Masayuki;Masuko, Akira;Taguchi, Takashi
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.149-152
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    • 2004
  • A new joint source channel coding reduces both input-width and average current consumption to transmit image data to LCD source drivers. As a source coding, it is based on entropy coding of differential pulse code modulation scheme, especially using median edge detector of image predictor. As a channel coding, it is not a simple pulse amplitude modulation, but linked by source entropy to reduce average amplitude. Simulation results show 1/4 width is achievable by 16-valued transmission with keeping conventional current consumption (0.36 to 1.3).

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Wavelet Transform Coding for Image Communication (영상 통신을 위한 웨이블릿 변환 부호화)

  • Kim, Yong-Yeon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.6 no.1
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    • pp.61-67
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    • 2011
  • In this paper, a new method for effective video coding is studied. Picture set filter is proposed for preserving compression ratio and video quality. This filter controls the compression ratio of each frame depending on the correlation to the reference frame by selectively eliminating less important high-resolution areas. Consequently, video quality can be preserved and bit rate can be controlled adaptively. In the simulation, to test the performance of the proposed coding method, comparisons with the full search block matching algorithm and the differential image coding algorithm are made. In the former case, video quality, compression ratio and encoding time is improved. In the latter case, video quality is degraded, but compression ratio and encoding time is improved. Consequently, the proposed method shows a reasonably good performance over existing ones.

Adaptive Residual DPCM using Weighted Linear Combination of Adjacent Residues in Screen Content Video Coding (스크린 콘텐츠 비디오의 압축을 위한 인접 화소의 가중 합을 이용한 적응적 Residual DPCM 기법)

  • Kang, Je-Won
    • Journal of Broadcast Engineering
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    • v.20 no.5
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    • pp.782-785
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    • 2015
  • In this paper, we propose a novel residual differential pulse-code modulation (RDPCM) coding technique to improve coding efficiency of screen content videos. The proposed method uses a weighted combination of adjacent residues to provide an accurate estimate in RDPCM. The weights are trained in previously coded samples by using an L1 optimization problem with the least absolute shrinkage and selection operation (LASSO). The proposed method achieves BD-rate saving about 3.1% in all-intra coding.

Differential Space Time Coding based on Different Unitary Matrices Sets

  • Lee, Kwang-Jae;Kim, Chang-Joo;Yoo, Hyun-Seok;Kim, Sung-Hun;Lee, Moon-Ho
    • Journal of electromagnetic engineering and science
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    • v.6 no.4
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    • pp.209-216
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    • 2006
  • This paper investigates a distinct set of complex unitary matrices for QPSK differential space time coding. After properly selecting the initial transmission matrix and unitary matrices we find that the different combinations of them could lead different BER performance over slow/fast Rayleigh fading channels and antennas correlated channels. The numerical results show that the proper selection of the initial transmission matrix and the set of unitary matrices can efficiently improve the bit error rate performance, especially for the antennas correlated fading channel. The computer simulations are evaluated over slow and fast Rayleigh fading channels.

A Study on Color Associations of the Korean for Color Coding of Process Control Information (한국인의 고정관념에 부합하는 공정제어용 색상코드의 도출)

  • 김상호;박관석
    • Journal of the Korea Safety Management and Science
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    • v.6 no.1
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    • pp.187-199
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    • 2004
  • To suggest a more efficient way of delivering information for process control under computerized environment, population stereotypes of colors were tested with 57 Korean subjects. The subjects were asked to associate 11 colors salient at electronic video displays with 55 pairs of adjectives that might be used when they explain the current state of process. The levels of association were evaluated with semantic differential methods by 7 point scales. Based on the multivariate analyses, the 55 pairs of adjectives were grouped into three distinct dimensions. The emotional maps of the 11 colors with respect to each dimension were presented. The Quantitative relationships between the colors and subjective impressions were also calculated by quantification theory I. On the basis of these color associations, it was suggested a general guideline for color coding when delivering process information