The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Long-wen Chang - One of the best experts on this subject based on the ideXlab platform.
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Designing JPEG quantization tables based on human Visual System
Signal Processing: Image Communication, 2001Co-Authors: Ching Yang Wang, Shiuh Ming Lee, Long-wen ChangAbstract:In this paper, we propose a Systematic procedure to design a quantization table based on the human Visual System model for the baseline JPEG coder. By incorporating the human Visual System model with a uniform quantizer, a perceptual quantization table is derived. The quantization table can be easily adapted to the specified resolution for viewing and printing. Experimental results indicate that the derived HVS-based quantization table can achieve better performance in rate-distortion sense than the JPEG default quantization table.
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ICIP (2) - Designing JPEG quantization tables based on human Visual System
Proceedings 1999 International Conference on Image Processing (Cat. 99CH36348), 1999Co-Authors: Long-wen Chang, Ching Yang Wang, Shiuh Ming LeeAbstract:In this paper, a quantization table based on the human Visual System is designed for the baseline JPEG coder. By incorporating the human Visual System with the uniform quantizer, a perceptual quantization table is derived. The quantization table is easy to adapt to the specified resolution for viewing and printing. Experimental results indicate that the HVS-based quantization table can achieve improvements in PSNR about 0.2-2.0 dB without increasing the complexity in both encoder and encoder.
Ching Yang Wang - One of the best experts on this subject based on the ideXlab platform.
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Designing JPEG quantization tables based on human Visual System
Signal Processing: Image Communication, 2001Co-Authors: Ching Yang Wang, Shiuh Ming Lee, Long-wen ChangAbstract:In this paper, we propose a Systematic procedure to design a quantization table based on the human Visual System model for the baseline JPEG coder. By incorporating the human Visual System model with a uniform quantizer, a perceptual quantization table is derived. The quantization table can be easily adapted to the specified resolution for viewing and printing. Experimental results indicate that the derived HVS-based quantization table can achieve better performance in rate-distortion sense than the JPEG default quantization table.
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ICIP (2) - Designing JPEG quantization tables based on human Visual System
Proceedings 1999 International Conference on Image Processing (Cat. 99CH36348), 1999Co-Authors: Long-wen Chang, Ching Yang Wang, Shiuh Ming LeeAbstract:In this paper, a quantization table based on the human Visual System is designed for the baseline JPEG coder. By incorporating the human Visual System with the uniform quantizer, a perceptual quantization table is derived. The quantization table is easy to adapt to the specified resolution for viewing and printing. Experimental results indicate that the HVS-based quantization table can achieve improvements in PSNR about 0.2-2.0 dB without increasing the complexity in both encoder and encoder.
Shiuh Ming Lee - One of the best experts on this subject based on the ideXlab platform.
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Designing JPEG quantization tables based on human Visual System
Signal Processing: Image Communication, 2001Co-Authors: Ching Yang Wang, Shiuh Ming Lee, Long-wen ChangAbstract:In this paper, we propose a Systematic procedure to design a quantization table based on the human Visual System model for the baseline JPEG coder. By incorporating the human Visual System model with a uniform quantizer, a perceptual quantization table is derived. The quantization table can be easily adapted to the specified resolution for viewing and printing. Experimental results indicate that the derived HVS-based quantization table can achieve better performance in rate-distortion sense than the JPEG default quantization table.
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ICIP (2) - Designing JPEG quantization tables based on human Visual System
Proceedings 1999 International Conference on Image Processing (Cat. 99CH36348), 1999Co-Authors: Long-wen Chang, Ching Yang Wang, Shiuh Ming LeeAbstract:In this paper, a quantization table based on the human Visual System is designed for the baseline JPEG coder. By incorporating the human Visual System with the uniform quantizer, a perceptual quantization table is derived. The quantization table is easy to adapt to the specified resolution for viewing and printing. Experimental results indicate that the HVS-based quantization table can achieve improvements in PSNR about 0.2-2.0 dB without increasing the complexity in both encoder and encoder.
Lamberto Maffei - One of the best experts on this subject based on the ideXlab platform.
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Acceleration of Visual System Development by Environmental Enrichment
The Journal of neuroscience : the official journal of the Society for Neuroscience, 2004Co-Authors: Laura Cancedda, Elena Putignano, Alessandro Sale, Alessandro Viegi, Nicoletta Berardi, Lamberto MaffeiAbstract:Thus far, the developmental plasticity of the Visual System has been studied by altering or reducing Visual experience. Here, we investigated whether a complex sensory-motor stimulation, provided by rearing animals in an enriched environment, affects Visual System development. We found that raising mice in this condition causes an earlier eye opening, a precocious development of Visual acuity, and an accelerated decline of white matter-induced long-term potentiation. These effects are accompanied by a precocious cAMP response element-mediated gene expression and a significant increase of BDNF protein and GAD65/67 expression in enriched pups. In addition, we showed that enriched pups experienced higher levels of licking behavior provided by adult females. Thus, rearing mice from birth in an enriched environment leads to a conspicuous acceleration of Visual System development as ascertained at behavioral, electrophysiological, and molecular level.
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Plasticity in the developing Visual System.
Current opinion in neurology, 1996Co-Authors: Tommaso Pizzorusso, Lamberto MaffeiAbstract:A long series of studies beginning with the pioneering experiments of Wiesel and Hubel [1] has shown that correct Visual experience is crucial for the development of the Visual System. Recent results suggest that neurotrophic factors of the nerve growth factor family might have a relevant role in mediating the effects of Visual experience on the developing Visual System.
Yasuhiro Nakai - One of the best experts on this subject based on the ideXlab platform.
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Waves of differentiation in the fly Visual System
Developmental biology, 2013Co-Authors: Makoto Sato, Takumi Suzuki, Yasuhiro NakaiAbstract:Sequential progression of differentiation in a tissue or in multiple tissues in a synchronized manner plays important roles in development. Such waves of differentiation are especially important in the development of the Drosophila Visual System, which is composed of the retina and the optic lobe of the brain. All of the components of the fly Visual System are topographically connected, and each ommatidial unit in the retina corresponds to a columnar unit in the optic lobe, which is composed of lamina, medulla, lobula and lobula plate. In the developing retina, the wave of differentiation follows the morphogenetic furrow, which progresses in a posterior-to-anterior direction. At the same time, differentiation of the lamina progresses in the same direction, behind the lamina furrow. This is not just a coincidence: differentiated photoreceptor neurons in the retina sequentially send axons to the developing lamina and trigger differentiation of lamina neurons to ensure the progression of the lamina furrow just like the furrow in the retina. Similarly, development of the medulla accompanies a wave of differentiation called the proneural wave. Thus, the waves of differentiation play important roles in establishing topographic connections throughout the fly Visual System. In this article, we review how neuronal differentiation and connectivity are orchestrated in the fly Visual System by multiple waves of differentiation.
