基于人眼視覺特性的h.264改進算法.doc
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基于人眼視覺特性的h.264改進算法,基于人眼視覺特性的h.264改進算法全文4300余字 圖文并茂摘 要 在對人眼視覺系統(tǒng)(hvs)的研究中，人們發(fā)現(xiàn)人眼對不同亮度的信號敏感程度不同。背景亮度較高的區(qū)域，人眼對于失真的敏感程度會大大降低。因此，編碼器可以利用人眼視覺的這一特性進行改進。本文針對這一特性，對h.264視頻編碼算法進行了改進，通過調(diào)整量化步長...
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基于人眼視覺特性的H.264改進算法
全文4300余字 圖文并茂
摘 要 在對人眼視覺系統(tǒng)(HVS)的研究中，人們發(fā)現(xiàn)人眼對不同亮度的信號敏感程度不同。背景亮度較高的區(qū)域，人眼對于失真的敏感程度會大大降低。因此，編碼器可以利用人眼視覺的這一特性進行改進。本文針對這一特性，對H.264視頻編碼算法進行了改進，通過調(diào)整量化步長(QP)，對不同亮度區(qū)域進行不同級別的量化，在不影響視頻主觀質(zhì)量的情況下提高編碼器壓縮效率。實驗結(jié)果表明，采用本改進算法的H.264參考編碼器輸出碼率下降幅度達到10%-20%，而解碼視頻的主觀觀測質(zhì)量同標準H.264編碼器相當(dāng)。
關(guān)鍵詞 人眼視覺系統(tǒng) 視覺冗余 韋伯-費希納定律 H.264 可變步長
A Improved Coding Method of H.264 Based on
Human Visual Perceptual
Abstract In the study of human visual system (HVS), it was found that the sensitive of human eyes are vary with different luminance signals. The eyes’ sensitivity of distortion will be greatly reduced in the high brightness background region. Therefore, the human visual characteristics can be used in the encoder improvement. In this paper, with this characteristics, the H.264 video coding algorithm was improved by adjusting quantization step (QP) with different luminance, thus improve the coding efficiency of compression with out affect the quality of video subjective circumstances. The experimental results proves that this improved algorithm of the H.264 encoder can reduce the output bit rate by 10% -20% while the subjective observation quality of decoded vidios correspond the standard H.264 encoder.
Keywords Human Visual System(HVS); Visual redundancy; Webber-Fechner law; H.264; variable QP
部分參考文獻
[5] 余兆明，查日勇，黃磊，周海驕，圖像編碼標準H.264技術(shù)，p31,人民郵電出版社，2006
[6] ITU-T Study Group 9 Contribution 80, Final Report from the Video Quality Experts Group on the Validation of Objective Models of Video Quality, June 2000
[3] Selig Hecht. The Visual Discrimination of Intensity and the Weber-Fenchner Law. The Journal of General Physiology, Vol 7, 235-267, The Rockefeller University Press
全文4300余字 圖文并茂
摘 要 在對人眼視覺系統(tǒng)(HVS)的研究中，人們發(fā)現(xiàn)人眼對不同亮度的信號敏感程度不同。背景亮度較高的區(qū)域，人眼對于失真的敏感程度會大大降低。因此，編碼器可以利用人眼視覺的這一特性進行改進。本文針對這一特性，對H.264視頻編碼算法進行了改進，通過調(diào)整量化步長(QP)，對不同亮度區(qū)域進行不同級別的量化，在不影響視頻主觀質(zhì)量的情況下提高編碼器壓縮效率。實驗結(jié)果表明，采用本改進算法的H.264參考編碼器輸出碼率下降幅度達到10%-20%，而解碼視頻的主觀觀測質(zhì)量同標準H.264編碼器相當(dāng)。
關(guān)鍵詞 人眼視覺系統(tǒng) 視覺冗余 韋伯-費希納定律 H.264 可變步長
A Improved Coding Method of H.264 Based on
Human Visual Perceptual
Abstract In the study of human visual system (HVS), it was found that the sensitive of human eyes are vary with different luminance signals. The eyes’ sensitivity of distortion will be greatly reduced in the high brightness background region. Therefore, the human visual characteristics can be used in the encoder improvement. In this paper, with this characteristics, the H.264 video coding algorithm was improved by adjusting quantization step (QP) with different luminance, thus improve the coding efficiency of compression with out affect the quality of video subjective circumstances. The experimental results proves that this improved algorithm of the H.264 encoder can reduce the output bit rate by 10% -20% while the subjective observation quality of decoded vidios correspond the standard H.264 encoder.
Keywords Human Visual System(HVS); Visual redundancy; Webber-Fechner law; H.264; variable QP
部分參考文獻
[5] 余兆明，查日勇，黃磊，周海驕，圖像編碼標準H.264技術(shù)，p31,人民郵電出版社，2006
[6] ITU-T Study Group 9 Contribution 80, Final Report from the Video Quality Experts Group on the Validation of Objective Models of Video Quality, June 2000
[3] Selig Hecht. The Visual Discrimination of Intensity and the Weber-Fenchner Law. The Journal of General Physiology, Vol 7, 235-267, The Rockefeller University Press
