映像情報メディア学会誌
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
63 巻 , 7 号
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  • 安部 拓也, 井村 誠孝, 池田 聖, 眞鍋 佳嗣, 千原 國宏
    2009 年 63 巻 7 号 p. 951-956
    発行日: 2009/07/01
    公開日: 2010/05/01
    ジャーナル フリー
    There is higher and higher demand for realistic computer-generated animation of natural phenomena based on the physical computation. Simulation for depicting realistic liquid motion requires high computational cost, and no versatile method is available. Water drops, which are in various scenes, cannot be depicted realistically by simulation in real time because of their specific physical features and the high computational cost. This paper proposes using extended smoothed particle hydrodynamics which simulates liquid motion with particles, to depict water drops with an interfacial tension model. The proposed method enables simulation of flat-shaped water drops with different contact angles.
  • 橋本 明記, 井上 康夫, 松本 英之, 方田 勲, 上田 和也, 市川 鋼一, 佐藤 彰, 柴田 豊, 石原 友和, 太田 陽介, 野崎 ...
    2009 年 63 巻 7 号 p. 957-966
    発行日: 2009/07/01
    公開日: 2010/05/01
    ジャーナル フリー
    Three channels, which will cease to be used for analog satellite broadcasting in July 2011 and 4 channels of the BS-17 19, 21, and 23ch, which were assigned to Japan at the WRC-2000, will be used for new digital broadcasting services after 2011. In these channels, a new broadcasting system called "Advanced Digital Satellite Broadcasting System" will be available as well as the current ISDB-S one. The new system can increase transmission bit rate by 30%compared with the current ISDB-S system by using LDPC codes and a roll-off factor of 0.1. The Association of Radio Industries and Businesses (ARIB) conducted evaluation tests to acquire its C/N-BER and synchronous performance as well as confirm how well the TMCC signal functions. Demonstrative tests to transmit Super Hi-Vision were also performed. The tests were done using a satellite simulator and a real satellite transponder. The tests showed that the system performed very well, and the details are reported here.
  • 松井 利一
    2009 年 63 巻 7 号 p. 967-976
    発行日: 2009/07/01
    公開日: 2010/05/01
    ジャーナル フリー
    It has been computationally clarified that how an image is observed affects how the human vision system perceives sharpness. To do this, we used a sharpness evaluation method based on the cooperative human vision model with image observation characteristics similar to those in human vision and examined the effect of the model's mechanism for observing an image on its sharpness metric performance. The evaluated images were continuous-tone generalized knife-edge, their edge-enhanced, and their digital halftone ones. The following results were obtained: (1) the vision model reproduced accommodation characteristics during subjective sharpness evaluation; (2) the sharpness evaluation metric with the image observing mechanism had a superior evaluation performance to the metric without it. These results suggest that the adaptive change in the image observation characteristic for evaluated images prevents the evaluation performance from deteriorating with evaluation conditions and that similar phenomena occur in the sharpness evaluation process in human vision.
  • 田中 賢一, 藤田 雄大
    2009 年 63 巻 7 号 p. 977-983
    発行日: 2009/07/01
    公開日: 2010/05/01
    ジャーナル フリー
    Several investigations has been conducted to determine the best way to improve the reconstruction of Kinoform images. Many of these investigations, however, forcused on the use of the iterative algorithm method, and little attention was paid to the use of the error-diffusion method. Most of the studies that have focused on the error-diffusion method examined its use in relation to binary-phase quantized holograms, not kinoform. Moreover, the relationship between an input object's position and the diffusion coefficients has not been reported. This is because the error-diffusion method reconstructed to separate the object as for the noise that originated in the quantization error. This paper discribes the application of a error-diffusion method that uses a complex number for the diffusion coefficient a kinoform. Results of Computer Simulation showd that the error diffusion method is superior to the iterative algorithm method for image reconstruction iterative algorithm because less processing. they also demonstrared that the restriction on the position of an object can be eased by changing the diffusion coefficient on the basis of that object's position.
  • 長瀬 章裕, 奥田 悟崇, 染谷 潤, 中西 邦文, 杉浦 博明
    2009 年 63 巻 7 号 p. 984-990
    発行日: 2009/07/01
    公開日: 2010/05/01
    ジャーナル フリー
    We have developed a high compression feed-forward driving (hcFFD) algorithm that dynamically controls the bit rate of a luminance and a color signal. Using this technique enables us to compress the image data stored in the frame memory to 1/6 of its original capacity.
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