Search Results 1-20 of 25

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  • Tone Conversion for Simple Subjective Assessment for the High Dynamic Range Images and Simple Objective Estimation Method  [in Japanese]

    TAKANO Hirofumi , INOMATA Mitsumi , AWANO Naoyuki , SUGIYAMA Kenji

    To realize the subjective assessment for high dynamic range (HDR) images, we have used professional use organic electroluminescence (EL) display which has enough contrast performance. In this, the pse …

    Technical report of IEICE. Multimedia and virtual environment 114(487), 183-186, 2015-03-03

  • Tone Conversion for Simple Subjective Assessment for the High Dynamic Range Images and Simple Objective Estimation Method  [in Japanese]

    TAKANO Hirofumi , INOMATA Mitsumi , AWANO Naoyuki , SUGIYAMA Kenji

    To realize the subjective assessment for high dynamic range (HDR) images, we have used professional use organic electroluminescence (EL) display which has enough contrast performance. In this, the pse …

    IEICE technical report. Image engineering 114(486), 183-186, 2015-03-03

  • Tone Conversion for Simple Subjective Assessment for the High Dynamic Range Images and Simple Objective Estimation Method  [in Japanese]

    TAKANO Hirofumi , INOMATA Mitsumi , AWANO Naoyuki , SUGIYAMA Kenji

    To realize the subjective assessment for high dynamic range (HDR) images, we have used professional use organic electroluminescence (EL) display which has enough contrast performance. In this, the pse …

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(485), 183-186, 2015-03-03

  • Objective Picture Quality Evaluation Considering Gaze Points Dispersion  [in Japanese]

    MIYAJI Satoshi , HAMADA Takahiro , MATSUMOTO Shuichi

    … Simulation result shows that an accuracy of picture quality evaluation is improved compared with a conventional SNR or WSNR method. …

    PROCEEDINGS OF THE ITE ANNUAL CONVENTION 1997(0), 216-217, 1997

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  • A Method of Aquiring Valid Gaze Point Information : for Applying to Image Evaluation  [in Japanese]

    Miyaji Satoshi , Hamada Takahiro , Matsumoto Shuichi

    … ないことが知られている.この原因として,・視覚的に目立つ・目立たない雑音を同一に取り扱う・注視点が考慮されていないなどが挙げられる.これまで,前者の雑音に対しては,視覚特性を考慮した重み付けSNR(WSNR)が文献[1],[2]等で定義され,その有効性が確認されている.しかし,注視点情報を考慮した評価については,報告例がない.そこで本稿では,注視点情報を考慮してSNRを求めることで,その値をより主観評価値に近づけ …

    Proceedings of the IEICE General Conference 1996年.情報・システム(2), 91, 1996-03-11

  • Compression of High-Resolution Images Using DCT with Variable Block Sizes. Part 2. Compression Based on Visual Characteristics.:Part 2 Compression Based on Visual Characteristics  [in Japanese]

    YAHAGI Takashi , SHINSHO Masayuki

    … The concept of weighted signal-to-noise ratio (WSNR) is introduced using the visual sensitivity function. … The WSNR is used instead of SNR for evaluating the reconstructed images. … Various kinds of simulation results using the WSNR are presented, and they are compared with those using the conventional SNR. … These results show that the WSNR is more useful for the compression of high-resolution images. …

    Journal of Printing Science and Technology 33(1), 46-56, 1996

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  • An Improvement of the WSNR by Considering Entropy of Sub-blocks in Coded Picture  [in Japanese]

    OKAMOTO Jun , HANGAI Seiichiro , MIYAUCHI Kazuhiro

    … For the purpose of evaluating noise on coded images correctly, entropy of 16×16 block is measured and used for reducing noise before WSNR (Weighted SNR) calculation. … According to results, the dispersion from the relation curve between the MOS (Mean Opinion Score) and the WSNR becomes 0.243 for amount of pictures with four different scene. … This small dispersion shows that we can predict the MOS by the improved WSNR with small error. …

    Proceedings of The ITE Annual Convention 30(0), 135-136, 1994

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  • STUDY ON THE OBJECTIVE ESTIMATION MEASURE OF STILL PICTURE (PART6)  [in Japanese]

    ISHIKAWA Masayuki , HANGAI Seiichiro , MIYAUCHI Kazuhiro

    … In order to cartify the availability of the WSNR(Weighted Signal to Noise Ratio) to the objective evaluation of distortion of any picture, two kind of pictures are distorted and various distortion is evaluated by the MOS(Mean Opinion Score) and the WSNR. … From results, when distortion of pictures with a human figure is evaluated, it is found that relation between the MOS and the WSNR is linear. …

    Proceedings of The ITE Annual Convention 27(0), 185-186, 1991

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  • A fast Halftoning method by using an inverse halftoning LUT  [in Japanese]

    SUZUKI Rintaro , NAKASHIZUKA Makoto , IIGUNI Youji

    In this paper, we propose a fast halftoning method by using an inverse halftoning LUT (Look-Up Table). Usually, image proccessing tasks for halftone images, such as geometric transformation and contra …

    IEICE technical report 107(100), 31-36, 2007-06-21

    References (11)

  • A fast Halftoning method by using an inverse halftoning LUT  [in Japanese]

    SUZUKI Rintaro , NAKASHIZUKA Makoto , IIGUNI Youji

    In this paper, we propose a fast halftoning method by using an inverse halftoning LUT (Look-Up Table). Usually, image proccessing tasks for halftone images, such as geometric transformation and contra …

    IEICE technical report 107(102), 31-36, 2007-06-14

    References (11)

  • A fast Halftoning method by using an inverse halftoning LUT  [in Japanese]

    SUZUKI Rintaro , NAKASHIZUKA Makoto , IIGUNI Youji

    In this paper, we propose a fast halftoning method by using an inverse halftoning LUT (Look-Up Table). Usually, image proccessing tasks for halftone images, such as geometric transformation and contra …

    IEICE technical report 107(104), 31-36, 2007-06-14

    References (11)

  • Experimentally Derived Weighting Function in Spatial Frequency Domain for Evaluating Still Pictures.  [in Japanese]

    Hangai Seiichiro , Wada Toru , Miyauchi Kazuhiro

    … The function is isotropic in the region from 3 (cpd) to 8 (cpd) and anisotropic at over 10 (cpd).<BR>Using the weighting function, a new objective measure named WSNR (Weighted Signal-to-Noise Ratio) is also defined and applied to pictures degraded artificially. … Experiments using different portrait pictures show good correlation coefficients between the MOS and the WSNR, 0.93-0.97. …

    The Journal of the Institute of Television Engineers of Japan 46(3), 295-299, 1992

    J-STAGE  Cited by (16)

  • The Collaborative Evaluation Method of Coded Picture Quality Using the Internet  [in Japanese]

    HANGAI Seiichiro , HAMAMOTO Takayuki , TAKANO Hidetaka

    In order to avoid tiresome and tedious evaluation of coded pictures, collaborative subjective evaluation method using Internet is newly proposed. Except for observation conditions, evaluating environm …

    The Journal of The Institute of Image Information and Television Engineers 54(5), 743-746, 2000-05-20

    J-STAGE  References (7)

  • Digital Picture Quality Assessment Method by Object-Oriented Noise Weighting  [in Japanese]

    MIYAJI Satoshi , HAMADA Takahiro , MATSUMOTO Shuichi

    … In addition to conventional noise weighting manner such as WSNR and dispersion of gaze points, mosquito noise, blocking artifacts and speed of gaze point are considerd for object regions utilizing object-oriented noise weighting. …

    ITE Technical Report 21.63(0), 25-30, 1997

    J-STAGE  References (9)

  • Proposal of Objective Measure AWSNR Considering Human Visual Characteristics  [in Japanese]

    KUSAYAMA Takayoshi , HAMAMOTO Takayuki , HANGAI Seiichiro

    An objective evaluation measure AWSNR that reflects human visual characteristics is proposed. In the measure, the spatial complexity of the original picture is determined from the fractal dimension, a …

    The Journal of The Institute of Image Information and Television Engineers 55(11), 1443-1449, 2001-11-20

    J-STAGE  References (12)

  • A Study on Picture Quality Evaluation Measure AWSNR Considering Local Entropy for Coded Monochrome Still Picture  [in Japanese]

    Okamoto Jun , Hangai Seiichiro , Miyauchi Kazuhiro

    An objective evaluation measure AWSNR (Advanced Weighted Signal to Noise Ratio) which compensates coding noise by considering entropy in every 16×16 pixels sub-block is proposed. In order to clarify t …

    ITE Technical Report 19(59), 37-42, 1995

    J-STAGE  References (8)

  • Improvement in Picture Evaluation Measure WSNR for Monochrome Still Picture Considering Local Entropy  [in Japanese]

    HANGAI Seiichiro , OKAMOTO Jun , MIYAUCHI Kazuhiro

    An objective evaluation measure AWSNR (Advanced Weighted Signal to Noise Ratio) which compensates coding noise by considering entropy in every 16×16 pixels sub-block is proposed. In order to cla …

    The Journal of the Institute of Television Engineers of Japan 00049(00008), 1078-1086, 1995-08-20

    J-STAGE  References (13) Cited by (8)

  • A Restoration and Evaluation of Various Modulation Images by Two Dimensional Visual Model (XVI)  [in Japanese]

    MIYASHITA Soshi , KAWASAKI Junji , OKAMOTO Hirokazu , IIJIMA Taizo

    … The Purpose of this paper is to compare PSNR, WSNR, average filter and measure of approximation using the visual model. … The results of a series of experiments show that ranking by subjective evaluation dose not coincide with PSNR, WSNR, and average filter, but coincides with a measure of approximation using the visual model. …

    ITE Technical Report 26.83(0), 39-42, 2002

    J-STAGE  References (5)

  • A Restoration and Evaluation of Various Modulation Images by Two Dimensional Visual Model (XVI)  [in Japanese]

    MIYASHITA Soshi , KAWASAKI Junji , OKAMOTO Hirokazu , IIJIMA Taizo

    … The Purpose of this paper is to compare PSNR, WSNR, average filter and measure of approximation using the visual model. … The results of a series of experiments show that ranking by subjective evaluation dose not coincide with PSNR, WSNR, and average filter, but coincides with a measure of approximation using the visual model. …

    IEICE technical report. Communication systems 102(517), 39-42, 2002-12-10

    References (5)

  • The Marginal Performance of Motion Compensated DCT Coding Scheme Based on Optimiaed Quantizer  [in Japanese]

    HAMADA Takahiro , MATSUMOTO Shuichi , MURAKAMI Hitomi

    … ど行われていないため,この特性限界が不明確となっている.そこで本論文では,動き補償DCT符号化再生画像の評価量として,人間の視覚特性により重みづけされたSN比(WSNR)をまず定義する.そして解析を可能とするための画像モデルを設け,WSNR最大化の観点から量子化器の理論的最適化を導き,これから得られる速度-ひずみ限界により簡易に特性限界を把握しえる手法を提案する.例として,現行テレビ放送 …

    The Transactions of the Institute of Electronics,Information and Communication Engineers B-(0xF9C1) 00078(00011), 689-699, 1995-11-25

    References (13) Cited by (6)

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