The Experts below are selected from a list of 112341 Experts worldwide ranked by ideXlab platform
Hsueh-ming Hang - One of the best experts on this subject based on the ideXlab platform.
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Source model for transform video coder and its application. II. Variable Frame Rate coding
IEEE Transactions on Circuits and Systems for Video Technology, 1997Co-Authors: Jiann-jone Chen, Hsueh-ming HangAbstract:In the first part of this paper, we derived a source model describing the relationship between bits, distortion, and quantization step size for transform coders. Based on this source model, a variable Frame Rate coding algorithm is developed. The basic idea is to select a proper picture Frame Rate to ensure a minimum picture quality for every Frame. Because our source model can predict approximately the number of coded bits when a certain quantization step size is used, we could predict the quality and bits of coded images without going through the entire real-coding process. Therefore, we could skip the right number of picture Frames to accomplish the goal of constant image quality. Our proposed variable Frame Rate coding schemes are simple but quite effective as demonstRated by simulation results. The results of using another variable Frame Rate scheme, Test Model for H.263 (TMN-5), and the results of using a fixed Frame Rate coding scheme, Reference Model 8 for H.261 (RM8), are also provided for comparison.
Yao Wang - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - Perceptual quality of video with Frame Rate variation: A subjective study
2010 IEEE International Conference on Acoustics Speech and Signal Processing, 2010Co-Authors: Yen-fu Ou, Yan Zhou, Yao WangAbstract:This work investigates the impact of periodic Frame Rate variation on perceptual video quality. Among many dimensions of Frame Rate variation, as a first step we focus on videos in which two Frame Rates alternate over fixed intervals. We present subjective test results, and analyze the influence of several factors (including the average Frame Rate, the Frame Rate deviation, and the video content) on the perceptual quality.
Jiann-jone Chen - One of the best experts on this subject based on the ideXlab platform.
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Source model for transform video coder and its application. II. Variable Frame Rate coding
IEEE Transactions on Circuits and Systems for Video Technology, 1997Co-Authors: Jiann-jone Chen, Hsueh-ming HangAbstract:In the first part of this paper, we derived a source model describing the relationship between bits, distortion, and quantization step size for transform coders. Based on this source model, a variable Frame Rate coding algorithm is developed. The basic idea is to select a proper picture Frame Rate to ensure a minimum picture quality for every Frame. Because our source model can predict approximately the number of coded bits when a certain quantization step size is used, we could predict the quality and bits of coded images without going through the entire real-coding process. Therefore, we could skip the right number of picture Frames to accomplish the goal of constant image quality. Our proposed variable Frame Rate coding schemes are simple but quite effective as demonstRated by simulation results. The results of using another variable Frame Rate scheme, Test Model for H.263 (TMN-5), and the results of using a fixed Frame Rate coding scheme, Reference Model 8 for H.261 (RM8), are also provided for comparison.
Kaoru Nakazono - One of the best experts on this subject based on the ideXlab platform.
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Frame Rate as a QoS parameter and its influence on speech perception
Multimedia Systems, 1998Co-Authors: Kaoru NakazonoAbstract:The preservation of QoS for multimedia traffic through a data network is a difficult problem. We focus our attention on video Frame Rate and study its influence on speech perception.When sound and picture are discrepant (e.g., acoustic 'ba' combined with visual 'ga'), subjects perceive a different sound (such as 'da'). This phenomenon is known as the McGurk effect. In this paper, the influence of degraded video Frame Rate on speech perception is studied.It is shown that, when flame Rate decreases, correct hearing is improved for discrepant stimuli and is degraded for congruent (voice and picture are the same) stimuli. Furthermore, we studied the case where lip closure was always captured by the synchronization of sampling time and lip position. In this case, Frame Rate has little effect on mishearing for congruent stimuli. For discrepant stimuli, mishearing is decreased with degraded Frame Rate. These results indicate that the stiff motion of lips resulting from low Frame Rate cannot give enough labial information for speech perception. In addition, the effect of delaying the picture to correct for low Frame Rate was studied. The results, however, were not as definitive as expected, because of compound effects related to the synchronization of sound and picture. Finally, we inspected the still pictures of normal Japanese speech and determined a lower limit of Frame Rate from the view point of assisting hearing.
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Frame Rate of motion picture and its influence on speech perception
Multimedia Computing and Networking 1996, 1996Co-Authors: Kaoru NakazonoAbstract:The preservation of QoS for multimedia traffic through a data network is a difficult problem. We focus our attention on video Frame Rate and study its influence on speech perception. When sound and picture are discrepant (e.g., acoustic `ba' combined with visual `ga'), subjects perceive a different sound (such as `da'). This phenomenon is known as the McGurk effect. In this paper, the influence of degraded video Frame Rate on speech perception was studied. It was shown that when Frame Rate decreases, correct hearing is improved for discrepant stimuli and is degraded for congruent (voice and picture are the same) stimuli. Furthermore, we studied the case where lip closure was always captured by the synchronization of sampling time and lip position. In this case, Frame Rate has little effect on mishearing for congruent stimuli. For discrepant stimuli, mishearing is decreased with degraded Frame Rate. These results indicate that stiff motion of lips resulting from low Frame Rate cannot give enough labial information for speech perception. In addition, the effect of delaying the picture to correct for low Frame Rate was studied. The results, however, were not as definitive as expected because of compound effects related to the synchronization of sound and picture.
Yen-fu Ou - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - Perceptual quality of video with Frame Rate variation: A subjective study
2010 IEEE International Conference on Acoustics Speech and Signal Processing, 2010Co-Authors: Yen-fu Ou, Yan Zhou, Yao WangAbstract:This work investigates the impact of periodic Frame Rate variation on perceptual video quality. Among many dimensions of Frame Rate variation, as a first step we focus on videos in which two Frame Rates alternate over fixed intervals. We present subjective test results, and analyze the influence of several factors (including the average Frame Rate, the Frame Rate deviation, and the video content) on the perceptual quality.
