Emotion Recognition and its Aesthetic InterpretationIt is well known that facial expressions are the most powerful tools for communicating human emotions. Describing and measuring emotions has always been quite a challenge in many aspects of evolution of arts and technology development. |
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An updatable holographic three-dimensional display |
An updatable holographic three-dimensional displayNature 451, 694-698 (7 February 2008) Holographic three-dimensional (3D) displays1, 2 provide realistic images without the need for special eyewear, making them valuable tools for applications that require situational awareness, such as medical, industrial and military imaging. Currently commercially available holographic 3D displays3 use photopolymers that lack image-updating capability, resulting in restricted use and high cost. Photorefractive polymers4, 5, 6, 7, 8, 9 are dynamic holographic recording materials that allow updating of images and have a wide range of applications, including optical correlation10, imaging through scattering media11 and optical communication12, 13. To be suitable for 3D displays, photorefractive polymers need to have nearly 100% diffraction efficiency, fast writing time, hours of image persistence, rapid erasure, and large area—a combination of properties that has not been shown before. Here, we report an updatable holographic 3D display based on photorefractive polymers with such properties, capable of recording and displaying new images every few minutes. This is the largest photorefractive 3D display to date (4 Sava
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