13 May 2018, Volume 36 Issue 9

    

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Spescial Issues
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  The development trend of virtual reality and augmented reality technology based on holographic optics

  HE Zehao, SUI Xiaomeng, ZHAO Yan, CAO Liangcai, JIN Guofan

  Science & Technology Review. 2018, 36(9): 8-17. https://doi.org/10.3981/j.issn.1000-7857.2018.09.001

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  The current situation and development trend of virtual reality (VR) and augmented reality (AR) industry are introduced. In terms of display technology, the main technical proposals of current VR/AR equipment are reviewed. The advantages and disadvantages of these technical schemes are compared in detail. Aimed at the issues of these technical solutions, the advantages of holographic optical technology are put forward and the role of holographic optical technology in VR/AR industry is clarified. The latest developments of holographic optics in near eye display are investigated. The significance of these achievements for VR/AR industry is addressed. Finally, the challenges faced by holographic optics in VR/AR industry are analyzed. The development trend of VR/AR industry based on holographic optics is also predicted.
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  3D display technology for augmented reality based on integral imaging-A review

  DENG Huan, WANG Qionghua

  Science & Technology Review. 2018, 36(9): 18-24. https://doi.org/10.3981/j.issn.1000-7857.2018.09.002

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  This paper analyzes the drawbacks of existing augmented reality devices and introduces the principle of integral imaging 3D display technology. The principles of several optical see-through augmented reality devices and systems based on integral imaging 3D display are reviewed, and the characteristics of the augmented reality technologies including off-axis optics, freeform optics, holographic optical element, and double 4f system are expounded respectively.
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  Vision-based virtual reality and augmented reality fusion technology

  NING Ruixin, ZHU Zunjie, SHAO Biyao, GONG Bingjian, YAN Chenggang

  Science & Technology Review. 2018, 36(9): 25-31. https://doi.org/10.3981/j.issn.1000-7857.2018.09.003

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  Visual-based virtual reality and augmented reality have their own developments, but the fusion development trend of the two is unavoidable in the future. SLAM (simultaneous localization ad mapping) is a major component of the application of virtual reality and augmented reality, but there are still many challenging issues in terms of robustness. This paper proposes a vision-based virtual reality and augmented reality fusion technology, which can analyze and solve the problems such as device selection, tracking, motion interference, and plane recognition in the 3D scene reconstruction process. Finally, the challenging issues in SLAM are discussed.
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  Optical measurement of AR/VR virtual display and development of IEC Standards

  MOU Xi, Venkat Venkataramanan, QIAO Bo, MOU Tongsheng

  Science & Technology Review. 2018, 36(9): 32-35. https://doi.org/10.3981/j.issn.1000-7857.2018.09.004

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  In recent years virtual reality and augmented reality technologies have developed rapidly, yet the visual comfort, experience and practicality of virtual display still need improvement. How to evaluate and measure the key performance, such as optical performance and image quality of virtual display, is an issue of great concern to the industry. An AR/VR virtual image is different from the traditional display, such as LCD, and the measuring method is also quite different. Based on the imaging mode of virtual display, this paper presents the measurement technology to simulate human eye pupil, vision, angle of view and spectral response. The progress of the international standardization of AR/VR virtual display optical measuring methods is introduced as well in combination with the standardization work by the IEC TC110 WG12 "Eyewear display" working group.
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  Image aesthetic quality assessment: A survey

  JIN Xin, ZHOU Bin, ZOU Dongqing, LI Xiaodong, SUN Hongbo, WU Le

  Science & Technology Review. 2018, 36(9): 36-45. https://doi.org/10.3981/j.issn.1000-7857.2018.09.005

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  Image quality assessment (IQA) is to measure the perceived image degradation while image aesthetic quality assessment (IAQA) is to automatically give a review of aesthetics of an image. The composition, color, illumination, depth of field, blurness, sharpness, etc. are analyzed by means of computer to analog the aesthetic perception and cognition of human beings. IAQA is a novel interdisciplinary field of computer aesthetics and computer vision, psychology, and virtual reality. IAQA can be used for photography, movie and television, ecommerce, fashion design, graphic design, document typesetting, industry design, automobile industry, architectural design, beauty makeup, etc. In this article, we give a brief history of IAQA. Then we review the methods based on hand-crafted aesthetic feature design, the methods based on deep aesthetic feature learning, new topics in IAQA, and dataset collection for IAQA. Finally, we give the future directions of IAQA.
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  VR as an adjuvant tool in ASD therapy

  FAN Lei, DU Yasong, ZHAI Guangtao

  Science & Technology Review. 2018, 36(9): 46-56. https://doi.org/10.3981/j.issn.1000-7857.2018.09.006

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  This paper reviews the features and development of VR technologies and their applications in medical treatments and mental health. It presents a history of discovery and understanding of ASD and the framework of an ASD non drug therapy system. A new treatment based on VR for ASD treatment is then introduced by analyzing the relation between VR and ASD, with various issues for research and development of VR-ASD treatment being discussed. New discoveries,new ideas, and massive experimental experience and skill are surveyed. Future research and development directions are prospected as well.
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  VR/AR application innovation and trend in cultural tourism and film

  CAO Sanxing, WANG Chunhua, LI Can

  Science & Technology Review. 2018, 36(9): 57-60. https://doi.org/10.3981/j.issn.1000-7857.2018.09.007

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  VR/AR is an emerging science and technology that will change the way of life of the general public andl have a significant impact on the field of popular culture. This paper introduces the supporting technologies of VR/AR in the field of cultural tourism and film and describes its application and innovation in the evolution and integration It also.predicts the VR/AR development trend and its influence on the media culture industry and discusses the future development trend in this field.
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  The characteristics and content design method of VR panoramic interactive media

  YE Feng

  Science & Technology Review. 2018, 36(9): 61-65. https://doi.org/10.3981/j.issn.1000-7857.2018.09.008

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  From the point of platform equipment and the way of content experience, VR is a kind of brand-new information media of audiovisual interactions. VR production technology and equipment experience have rapidly become popular in recent years, but if developers want their VR content products to get more success on the market, they need to improve their understandings of VR media properties and adopt an effective design method for the content. On the basis of an analysis of three aspects:VR experience behavior characteristics, VR experience of user requirements, and VR application scenarios, the article combs out the relationship between VR panoramic interaction characteristics and content innovation, and emphasizes the guiding role of design thinking in VR content creation.
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  Artificial intelligence is a new driving force for film and television industry

  ZHAO Tianqi

  Science & Technology Review. 2018, 36(9): 66-72. https://doi.org/10.3981/j.issn.1000-7857.2018.09.009

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  The principle of 3D-vision generation and the exploration process for human 3D-vision are introduced, and the way of making 3D content is analyzed. With the development of computer vision and artificial intelligence technology, a new transformation technology from 2D to 3D has been proposed and developed. The technology can automatically generate 3D content according to 2D images and the efficiency of 3D transformation has increased by more than 1,000 times without loss of quality. It is pointed out that based on this technology, new applications such as 3D live broadcast and 3D browser can be developed, and it is also expected that the problem of 3D content shortage is completely solved.
Reviews
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  Applications research of data mining technology in big data era

  LIU Ming, LÜ Dan, AN Yongcan

  Science & Technology Review. 2018, 36(9): 73-83. https://doi.org/10.3981/j.issn.1000-7857.2018.09.010

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  In the era of big data, data mining technology has received more and more attention. This paper introduces the research background and status of data mining technology, followed by detailed description of its relevant algorithms such as decision tree, support vector machine, neural networks in detail. It then analyzes the data mining related applications and future development trend. Finally, it summarizes the challenges data mining technology will be faced with in the era of big data.
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  Definition and thinking on natural gas hydrates reservoir

  ZHANG Jinhua, WEI Wei, CHEN Longqiao, LIN Binbin, PENG Yong, XIAO Hongping

  Science & Technology Review. 2018, 36(9): 84-90. https://doi.org/10.3981/j.issn.1000-7857.2018.09.011

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  Based on the definitions of unconventional gas reservoirs such as the tight gas, the shale gas and the coal bed methane, and the characteristics of the natural gas hydrate reservoir, the natural gas hydrate reservoir is defined as the natural gas hydrate accumulation with a certain amount of methane & other gases, migrated to appropriate strata with appropriate temperature and pressure, then stored in the formation/loose sediments in solid form, and the free gas accumulation directly associated with the natural gas hydrate accumulation. During the exploration and the evaluation of the natural gas hydrate resource, it is important to ascertain the free gas condition in the lower part of the natural gas hydrate accumulation. Characterized by the underlying free gas accumulation, the "solid-gas two-story-architecture style" natural gas hydrate reservoir is the current favorable exploitation target and the natural gas hydrate reservoir in Shenhu area is considered to be such kind of reservoir. When carrying out the resource evaluation and the test in the area, the natural gas hydrate accumulation and the free gas accumulation should be taken as a whole, which is expected to further improve the single well production and the economic benefits, promoting the exploration and the development of the natural gas hydrate.
Papers
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  An integrated design method coupling structure and control for industrial robot

  BAI Keqiang, LIU Zhigui, WANG Yingtong

  Science & Technology Review. 2018, 36(9): 91-96. https://doi.org/10.3981/j.issn.1000-7857.2018.09.012

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  Focused on the large error of separation design for industrial robot servo system structure and control, a new integrated design method for coupling structure and control is proposed. The method takes the structural weight, tracking precision and control energy as the target function, takes stable and fast tracking performance as the constraint, and considers the coupling problem of structure and control by using a step iterative strategy so as to achieve the goal of the industrial robot working in the best state. The integrated design method is evaluated via MTALAB on a two joint robot. Simulation results show that the proposed method can make the industrial robot have good robustness, and that the adjustment of the length of time, overshoot elimination and step response are all superior to those by separation design, the robot system being working in optimal performance.