Light-field displays typically consist of a two-dimensional(2D)display panel and a light modulation device.The 2D panel presents synthesized parallax images,with the total information content of the three-dimensional(...Light-field displays typically consist of a two-dimensional(2D)display panel and a light modulation device.The 2D panel presents synthesized parallax images,with the total information content of the three-dimensional(3D)light feld dictated by the panel's total resolution.Angular resolution serves as a critical metric for light-field displays,where higher angular resolution correlates with a more realistic 3D visual experience.However,the improvement of angular resolution is typically accompanied by a reduction in spatial resolution,due to the limitations of the 2D display panel's total resolution.To address this challenge,a light-feld display method with enhanced information utilization is introduced,achieved through the independent modulation of chrominance and luminance.A static light-field image display system is proposed to verify the feasibility of this method.The system employs a bidirectional angular modulation grating(BAMG)and a collimated light source(CLS)to create uniformly distributed viewpoints in space.A luminance modulation film(LMF)and a chrominance modulation film(CMF)are utilized to modulate the light-field information,with chrominance and luminance synthesized images printed at pixel densities of 720 pixels per inch(PPl)and 8000 dots per inch(DPl),respectively,to align with the differential sensitivities of the human visual system.In the experiment,the proposed display system achieves a full-parallax,high-fidelity color display with a 98.2°horizontal and 97.7°vertical field of view(FOV).So,the light-feld display method of modulating chrominance and luminance separately has been proven to achieve high-fidelity display effects.展开更多
Information has two aspects. One aspect is the objective one; another aspect is the subjective one. Shannon has discussed the objective aspect of information in information theory. But the subjective aspect of informa...Information has two aspects. One aspect is the objective one; another aspect is the subjective one. Shannon has discussed the objective aspect of information in information theory. But the subjective aspect of information has not been fully discussed. Someone use “Bayesian approaches” to evaluate the value of information. But in some cases it does not meet the information user＇s need. This paper is focus on the subjective aspect of objectively measurable information and gives formal definitions for information, information utility, and marginal information utility, normalized calculation of information utility. The information discussed in the paper has interdisciplinary nature. This work can be the foundation of many application areas.展开更多
Most of the data publishing methods have not considered sensitivity protection,and hence the adversary can disclose privacy by sensitivity attack.Faced with this problem,this paper presents a medical data publishing m...Most of the data publishing methods have not considered sensitivity protection,and hence the adversary can disclose privacy by sensitivity attack.Faced with this problem,this paper presents a medical data publishing method based on sensitivity determination.To protect the sensitivity,the sensitivity of disease information is determined by semantics.To seek the trade-off between information utility and privacy security,the new method focusses on the protection of sensitive values with high sensitivity and assigns the highly sensitive disease information to groups as evenly as possible.The experiments are conducted on two real-world datasets,of which the records include various attributes of patients.To measure sensitivity protection,the authors define a metric,which can evaluate the degree of sensitivity disclosure.Besides,additional information loss and discernability metrics are used to measure the availability of released tables.The experimental results indicate that the new method can provide better privacy than the traditional one while the information utility is guaranteed.Besides value protection,the proposed method can provide sensitivity protection and available releasing for medical data.展开更多
基金supported by the National Key Research and Development Program of China(2023YFB3611500)National Natural Science Foundation of China(62175015,62335002,62075016).
文摘Light-field displays typically consist of a two-dimensional(2D)display panel and a light modulation device.The 2D panel presents synthesized parallax images,with the total information content of the three-dimensional(3D)light feld dictated by the panel's total resolution.Angular resolution serves as a critical metric for light-field displays,where higher angular resolution correlates with a more realistic 3D visual experience.However,the improvement of angular resolution is typically accompanied by a reduction in spatial resolution,due to the limitations of the 2D display panel's total resolution.To address this challenge,a light-feld display method with enhanced information utilization is introduced,achieved through the independent modulation of chrominance and luminance.A static light-field image display system is proposed to verify the feasibility of this method.The system employs a bidirectional angular modulation grating(BAMG)and a collimated light source(CLS)to create uniformly distributed viewpoints in space.A luminance modulation film(LMF)and a chrominance modulation film(CMF)are utilized to modulate the light-field information,with chrominance and luminance synthesized images printed at pixel densities of 720 pixels per inch(PPl)and 8000 dots per inch(DPl),respectively,to align with the differential sensitivities of the human visual system.In the experiment,the proposed display system achieves a full-parallax,high-fidelity color display with a 98.2°horizontal and 97.7°vertical field of view(FOV).So,the light-feld display method of modulating chrominance and luminance separately has been proven to achieve high-fidelity display effects.
文摘Information has two aspects. One aspect is the objective one; another aspect is the subjective one. Shannon has discussed the objective aspect of information in information theory. But the subjective aspect of information has not been fully discussed. Someone use “Bayesian approaches” to evaluate the value of information. But in some cases it does not meet the information user＇s need. This paper is focus on the subjective aspect of objectively measurable information and gives formal definitions for information, information utility, and marginal information utility, normalized calculation of information utility. The information discussed in the paper has interdisciplinary nature. This work can be the foundation of many application areas.
基金supported by the National Natural Science Foundation of China(No.62062016)Doctoral research start‐up fund of Guangxi Normal University(RZ1900006676)Guangxi project of improving Middleaged/Young teachers'ability(No.2020KY020323)。
文摘Most of the data publishing methods have not considered sensitivity protection,and hence the adversary can disclose privacy by sensitivity attack.Faced with this problem,this paper presents a medical data publishing method based on sensitivity determination.To protect the sensitivity,the sensitivity of disease information is determined by semantics.To seek the trade-off between information utility and privacy security,the new method focusses on the protection of sensitive values with high sensitivity and assigns the highly sensitive disease information to groups as evenly as possible.The experiments are conducted on two real-world datasets,of which the records include various attributes of patients.To measure sensitivity protection,the authors define a metric,which can evaluate the degree of sensitivity disclosure.Besides,additional information loss and discernability metrics are used to measure the availability of released tables.The experimental results indicate that the new method can provide better privacy than the traditional one while the information utility is guaranteed.Besides value protection,the proposed method can provide sensitivity protection and available releasing for medical data.
