映像情報メディア学会誌
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
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60 巻, 7 号
選択された号の論文の23件中1～23を表示しています
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小特集
ユニバーサルデザイン
1. ユニバーサルデザイン概論
2. ユニバーサルデザインの実例
技術解説
講座
コンピュータビジョンは人のビジョンにどこまで近づいたか
～難点とそれを回避する実践的アプローチについて～
てれび・さろん
～時代を創った技術～
知っておきたいキーワード
映像現場訪問記
ニュース
論文・研究速報
論文小特集 画像の処理と符号化
小特集論文
  • フルーエンシ補間によるテレビ映像高精細化処理のハードウェア実装法
    大宮 康宏, 寅市 和男, 三浦 康之, 喜多村 守, 岡本 明, 和田 耕一, 亀山 啓輔, 諸岡 泰男
    2006 年 60 巻 7 号 p. 1042-1050
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1042
    ジャーナル フリー
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    New large displays are replacing the traditional Cathode Ray Tube. An important goal is to improve the quality of TV images to suit these displays. To achieve this goal, we use an interpolation process that convolutes the TV signal. In particular, a C-type fluency sampling function reported by produces high-quality interpolated images. However, the convolution processes with the C-type kernel requires large-scale hardware and a long delay. Therefore, we need develop a simple hardware implementation method for the interpolation based on the C-type function convolution of the TV signal. A hardware implementation method for the interpolation that can reduce the hardware and timing costs is described. The results that our method can reduce such costs and improve the image quality.
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  • フレーム毎にMCと3次元予測を最適化する動画像の可逆符号化方式
    塩寺 太一郎, 梅津 有司, 前田 弘樹, 松田 一朗, 森岡 一幸, 伊東 晋
    2006 年 60 巻 7 号 p. 1051-1058
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1051
    ジャーナル フリー
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    A novel lossless coding scheme for video signals is described. The scheme uses a block-adaptive 3D prediction method that predicts a video signal based on both the current and motion-compensated previous frames. The resulting prediction errors are encoded by using a kind of context-adaptive arithmetic coder. Several coding parameters such as prediction coefficients and motion vectors are iteratively optimized for each frame so that the overall coding rate can be a minimum. Moreover, a quadtree-based variable block-size motion compensation technique is introduced for efficient representation of motion information. Experimental results show that the coding rates of our scheme are 11-17% lower than those of the H. 264-based lossless coding scheme.

    お詫びと訂正 : 本論文 (pp. 1051～1058) の1052頁と1053頁を入れ違えておりました. ここにお詫びして訂正版を8月号に掲載いたします.

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  • 動画像符号化におけるサブバンド分割を用いた高速Matching Pursuitsアルゴリズム
    今村 幸祐, 小場 由雅, 橋本 秀雄
    2006 年 60 巻 7 号 p. 1059-1067
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1059
    ジャーナル フリー
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    A high-efficiency video coding method using matching pursuits, which is a waveform coding technique, was proposed. This method encodes a motion compensated prediction error image by applying matching pursuits. The matching pursuits algorithm approximates a signal using a dictionary. Therefore, the performance of this algorithm depends heavily on the dictionary. We propose a matching pursuits coding method that encodes the sub-band images derived from motion compensated prediction error images. The dictionaries used in our method are constructed to be suitable for the frequency characterisitc of each sub-band image. The complexity of our method is reduced compared with the full-band matching pursuits because of lighter inner product computation due to a reduction in both the resolution of the sub-band image and the basis function length of the dictionary. We evaluated the coding performance and computational complexity of our method via computer simulations.
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  • 3次元フィルタリングに基づく焦点合わせの異なる多数枚の画像群からの全焦点画像の生成
    児玉 和也, 久保田 彰
    2006 年 60 巻 7 号 p. 1077-1084
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1077
    ジャーナル フリー
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    A method for generating all-in-focus images by integrating multiple differently focused images is described. First, based on the assumption that objects are defocused by a simple geometrical blurring model, we derive a formula between acquired images on certain imaging planes and spatial information of objects by using a convolution of a 3-D blur. Then, we analyze spatial frequency components of the blur kernel to obtain a 3-D filter that generates an all-in-focus image from the acquired images. Simulations of image generation are performed utilizing synthetic images to study how noise, object depths, and certain parameters of the blur and the filter affect the quality. We also introduce pre-processing that corrects the size of acquired images and a simple method for estimating the parameter of the 3-D blur. Finally, we show experimental results of all-in-focus image generation from real images.
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小特集研究速報
 
論文
  • 移動人物を対象とする多方向顔画像取得と認識
    タンスリヤボン スリヨン, 蛯沢 純也, 花木 真一
    2006 年 60 巻 7 号 p. 1085-1094
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1085
    ジャーナル フリー
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    Multi-directional face image acquisition of moving people and techniques for recognizing them are described. Our system uses an extra active camera in addition to a conventional fixed camera. When the fixed camera detects a person who moves toward the active camera, it zooms in towards the person's head and captures close-up multi-directional face images by using multi-directional-averaged-face templates. It captures 3.9 times as many multi-directional face images as the technique using the front averaged-face template only. Our technique substantially increases the chance of identifying a person in a looking-at-people system. Further more, the obtained face image is recognized by using the template matching technique. The recognition system showed a correct recognition rate of 86.0 % for the face images automatically obtained from people in experimental environments. Our technique would be useful for this system to recover people's names if face-recognition fails at a specific place such as a room entrance, a person steps out of view and quickly comes back into view, or an original ID is reinstated after occlusion ends.
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  • スピンスタンド用高速高精度リニア・アクチュエータの2自由度制御
    長縄 明大, 藤枝 昌史, 森 英季, 干野 隆之, 大日方 五郎, 大内 一弘
    2006 年 60 巻 7 号 p. 1095-1101
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1095
    ジャーナル フリー
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    We studied a precise positioning system for a spinstand with a linear actuator and a digital controller. The linear actuator was composed of an air bearing and a linear voice coil motor. The digital controller was consisted of a digital signal processor. We tested a reference response and an impulse disturbance rejection for the linear actuator by using only a feedback controller. However, when we applied only the feedback controller for the linear actuator, there was a tradeoff between the reference response and the impulse disturbance for its performance. We applied a two-degrees-of-freedom (2DF) control which was consisted of a feedback controller and a feedforward controller. The feedback controller suppressed the disturbance and the feedforward controller improved the performance of the reference response. We investigated the effect of the controller from the simulations and the experimental results.
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  • 多層信頼度マップを用いた3次元映像の実時間生成システム
    國田 豊, 上野 雅浩, 田中 敬二
    2006 年 60 巻 7 号 p. 1102-1110
    発行日: 2006/07/01
    公開日: 2008/03/07
    DOIhttps://doi.org/10.3169/itej.60.1102
    ジャーナル フリー
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    We propose an image-based rendering method called “layered probability mapping.” The algorithm requires modest computer power but produces high-quality output images even from textureless or noisy input images. Thus, real-time applications, such as immersive teleconferencing and live broadcasting, are promising areas of use. The key idea is a layered probability map representation using a set of two-dimensional probabilistic functions. This takes into account ambiguities regarding object depth. To test the feasibility of this method, we developed a prototype system with nine synchronized cameras and a thirteen-PC cluster. By calculating the algorithm in parallel, we obtained stable 5-15FPS image generation without any off-line procedures between the image capture and the display.
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研究速報
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