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霜觸 謙介, 黒沢 直樹, 永名 継道, 辻 直也, 福原 健志, 中田 靖久
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発行日: 2006/08/01
公開日: 2017/05/24
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The encoder for one-segment broadcasting of ISDB-T has been developed. This encoder named VC-7000 performs high-quality video and audio coding at very low bitrate of one-segment bandwidth. One-segment broadcasting service has been already started since April '06 and VC-7000 are used in many broadcasting stations in Japan.
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田口 誠, 濱住 啓之, 伊藤 泰宏
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発行日: 2006/08/01
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We have developed a prototype receiver using a new reception method for emergency warning signals in One-Seg service and verified reception characteristics of the prototype receiver, In this report, it is shown that good characteristics and prospect of low power consumption are obtained.
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中山 稔啓, 岡村 智之, 池川 秀彦, 柴田 豊, 佐藤 誠, 丸山 芳樹, 阿部 真人, 藤澤 和也, 生越 啓史, 渡辺 保之, 亀井 ...
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Association of SFP designed and constructed the system for re-transmission of the terrestrial digital broadcasting signal in the subway system. Furthermore, we conducted the experiments to reveal the technical and operational parameters applicable in the subway system. We report our comprehensive activities as follows.
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岡野 正寛, 成清 善一, 土田 健一, 高田 政幸
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We have measured relation between input signal's correlation factor and reception performance with different input level in two-branch reception. The experimental results show that required minimum input level for two-branch diversity hand-held terminal is improved by up to 6.2dB under condition that correlation factor between two branches is 0.9 or less.
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木村 武史, 真島 恵吾, 国分 秀樹, 石川 清彦, 砂崎 俊二, 大竹 剛, 石川 浩一, 藤田 欣裕, 杉江 周一, 清本 晋作
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One-seg was launched on April 2006. Although it doesn't apply CA System, One-seg or similar narrow-band broadcasting may need CA System for future high quality services. We developed an experimental CA System for mobile-phone receivers which use stream cipher for scrambling and communication channel for license delivery.
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杉江 周一, 清本 晋作, 柴田 達雄, 吉田 耕司, 田中 俊昭, 中村 博行, 真島 恵吾, 木村 武史, 国分 秀樹
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A digital terrestrial broadcasting programs for fixed receptions are protected using Conditional Access System. "One seg" the narrow-band digital terrestrial broadcasting for cellular phones has been launched on 1st April 2006. However, One seg has no DRM mechanism such as CAS because current mechanisms are heavy for Cellular phones. We developed a lightweight CAS for cellular phones, which uses K2 stream cipher for scrambling.
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峯澤 彰, 松田 一朗, 伊東 晋
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We previously proposed a lossless video coding scheme based on motion compensation and adaptive 3D prediction. In this scheme, multiple 3D predictors which use both the current and motion-compensated previous frames are optimized for each frame, and then encoded as side information. Increasing the number of available predictors generally improves the accuracy of the adaptive prediction, however it requires larger amount of the side information at the same time. This paper reports the relationship between the number of the predictors and the resulting coding efficiency based on extensive experiments.
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谷沢 昭行, 中條 健
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The Intra prediction of H.264 achieves higher coding efficiency due to the spatial directional prediction. However it is difficult to predict the pixel far from a reference pixel, hi this paper, the pixel-based adaptive Intra prediction is proposed. Experimental results show that the proposed method improves bit reduction by up to 2.5% at same PSNR.
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西郷 賀津雄
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To remove different types of image distortion adaptively, the discriminant functions were derived from a linear discriminate analysis based on data of perceptual distortion and DCT coefficients in intra macroblocks of DCT image coding.
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豊田 陽介, 高木 幸一, 酒澤 茂之, 滝嶋 康弘
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In this paper, we propose a visibility control method for MPEG-2 video scrambling which alters DC prediction coefficients in an I-frame. The results of objective and subjective assessment show that the proposed method can achieve graceful degradation.
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藤田 尚宏, 久保田 彰, 羽鳥 好律
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We discuss extension of a novel adaptive control method by re-ordering differential signals before optimal quantization schemes to 2-dimensional interpolative prediction and evaluate the effect on the coding error power.
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坂東 幸浩, 上倉 一人, 八島 由幸
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It is really important to decide proper prediction mode in H.264 encoder, since there much more modes than conventional method such as MPEG-2. Reference software (JM) of H.264 uses squared error as the criterion of distortion for mode decision. However, squared error dose not always correspond to the distortion from the viewpoint of subjective quality. In this paper, we investigate the mode decision method based on human visual system in order to improve H.264 encoder.
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神田 龍一, 宮地 悟史, 柳原 広昌, 酒澤 茂之
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In the previous paper, we proposed an MPEG-4 based high-speed motion vector estimation method that optimizes the trade-off between motion detection accuracy and computational complexity. This paper extends the proposed method to H.264. Experimental results showed that the proposed method improved coding efficiency of H.264 as well as in the case of MPEG-4.
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辻 智弘, 米山 暁夫, 柳原 広昌, 滝嶋 康弘
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We evaluate a high quality frame-accurate editing method for H.264/MPEG-4 AVC contents which employed switch between "Re-Encoding" and "Re-Quantization". From our experiments, we confirmed that our proposed editing method is effective for minimization of picture quality degradation.
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吉野 知伸, 内藤 整, 小池 淳
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R-D optimization technology is very important to maintain high coding efficiency based on H.264/MPEG-4 AVC. In the conventional R-D optimization scheme, the cost function is defined by approximating the Lagrange coefficient. However, the Lagrange coefficient should be calculated dependent on image feature, and this approximation might cause performance degradation. From this perspective, the difference in Lagrange coefficient between the actual measurement and the approximating scheme was clarified first. Furthermore, the coding gain achieved by eliminating the above difference was evaluated from coding experiments.
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谷田 隆一, 清水 淳, 上倉 一人, 八島 由幸, 米原 紀子
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We have proposed a new parallel encoding algorithm for H.264 video coding standards. Simulation results indicate that the proposed method can reduce waiting time about 50% compared to the previous method if computational complexity in each macroblock is not the same.
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甲田 洋三, 堀内 隆彦
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Colorization is a technique that adds color to a monochrome image. The authors applied the technique to an image coding. As the next step, we develop a colorization image coding algorithm considering with visual characteristics. This paper proposed a colorization technique in opponent color space in S-CIELAB.
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発行日: 2006/08/01
公開日: 2017/05/24
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板倉 新治, 新井 宏昭, 牧田 英雄
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We have developed an optical interface equipment(NOIF-3000) for Serial Digital Interface of Video Signal. This paper describes an outline, the optical transmission characteristics and CWDM characteristics of this equipment.
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中戸川 剛, 前田 幹夫, 小山田 公之
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We have proposed a millimeter wave Radio-On-Fiber system for multi-channel digital TV services and a novel millimeter wave receiver. In this paper, a wireless transmission experiment demonstrates their practicality. It turns out that one millimeter wave transmitter has ability to cover one normal apartment building.
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木村 智, 神原 浩平, 岡部 聡, 土田 健一, 渋谷 一彦
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An ad hoc network system in millimeter wave will be effective for HDTV transmission on outside broadcast. We have developed a wireless multi-hop multi route HDTV transmission system in millimeter wave and evaluated the performance of it. Experimental results show that this system can provide stable HDTV transmission and sufficient throughput for broadcast material HDTV quality with negligible delay.
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木村 好信, 藤井 秀奇, 稲田 智徳
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Fuji Television Network Inc. has developed a modem for HDTV satellite transmission using the new system, International Standard DVB-S2, for the first time in the country. The experiment was conducted for the purpose of constructing transmission system with 32APSK variation that will enable HDTV transmission in four partition band of one transponder currently used in SDTV transmission. The experiment turned out to be successful.
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保科 徹, 平井 実, 渡辺 慎二, 柳田 良太
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発行日: 2006/08/01
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This paper describes a Triple Mode Field Pick-up Unit. A Triple Mode Field Pick-up Unit has Analog Method (FM Modulation) and Digital Method (Single Carrier/OFDM).
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中川 孝之, 池田 哲臣
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800MHz band is used for FPUs and radio microphones in broadcast programme productions. There are many reports on outdoor radio channel characteristics in 800MHz band, but indoor radio channel characteristics are rarely reported. Therefore we measured and analyzed delay profiles in a large room. Some results are presented here.
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安 英準, 沖野 裕丈, 山本 孝, 植田 俊吉, 出口 剛
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In this study, we explain for improvement execution-related in strip-shaped microwave absorbers of center frequency 5.8GHz used by an ETC system on a highway and evaluate a bias incidence characteristic of Transverse Electric wave, Transverse Magnetic wave and circularly polarized wave as well as FDTD simulation.
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発行日: 2006/08/01
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田岡 孝文, 吉田 征彦, 花里 敦夫, 今村 雅彦
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発行日: 2006/08/01
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We selected 6 receiving points which have different transmission path respectively, and we measured long-term level fluctuation of digital terrestrial television broadcasting signals transmitted from Tokyo Tower. The result shows that the characteristics of fading differ with conditions of transmission path, such as diffraction, and fluctuations of digital signal caused by fading is generally less than that of analog signal.
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田中 正克, 佐藤 誠, 浅見 洋介
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The purpose of this trial is to develop compact and lightweight transmitters for low-power relay stations of digital terrestrial broadcasting, which also suffice the required specifications. We will be glad if the products can be of help to mass construction of relay stations in a short period.
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佐藤 誠, 宮林 聡, 田畑 善朗, 菅谷 誠, 大岩 弘明
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Nippon Television Network Corporation and East Japan Railway did the experiment that received the DTTB on Yamanote Line. 12 segment service or one segment service was automatically switched responding to the reception situation and it displayed it in the display monitor.
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吉田 征彦, 田丸 修実, 小林 和正
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In order to receive Digital Terrestrial Television Broadcasting(DTTB) including One-Seg Service in closed space(such as underground shopping centers, subway stations, etc) where radio waves can not reach into directly from transmitters, we developed the antenna which re-transmit DTTB signals received outsides, which consists of two monopole antenna with different delay time respectively.
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山崎 正明, 築地 武彦
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It has been known that a good broad band antenna could be obtained by adding parasitic element at a small distance from and parallel to a monopole antenna. In this paper, a twin delta loop antenna with a closely spaced parasitic element for digital terrestrial broadcasting is presented. The effect of closely spaced parasitic element on twin delta loop antenna is discussed with respect to properties of input impedance. As a result, it is found that the twin delta loop antenna with closely spaced similar parasitic element have low VSWR and broadband.
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桐渕 直樹, 住広 尚三, 佐藤 源貞
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In a Two-Circular Loop Antenna with a reflector, it investigated about input impedance, radiation pattern, and power gain. It aims at development of the antenna to acquire the following features in a wide frequency band. 1. Input impedance adjustment can be easily taken. 2. It is high power gain. 3. When multiple arrangement is carried out, Horizontal radiation pattern becomes omnidirectional pattern.
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小郷 直人, 中澤 進, 田中 祥次
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We have proposed the detection method of excitation coefficients by using detector set near radiation horns to correct the beam pattern formed by onboard phased array antenna of broadcasting satellite, In this paper, we evaluate the correction accuracy of our proposed method.
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発行日: 2006/08/01
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梅谷 啓二, 小畠 牧人, 山本 亮, 山下 武則, 今井 茂樹
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An X-ray direct-conversion and image-zooming type detector with spatial resolutions of ca. 6, 8, and 10 μm was developed for real-time biomedical imaging. The detector was composed of an X-ray direct-conversion type SATICON pickup tube. Using the detector and a synchrotron radiation source at SPring-8, microangiography experiments were carried out for depicting tumor angiogenic vessels in a rabbit model of cancer.
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大川 裕司, 松原 智樹, 宮川 和典, 鈴木 四郎, 久保田 節, 谷岡 健吉, 小楠 功一, 小林 昭, 平井 忠明, 河合 敏昭
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The heat-treatment, which suppresses highlight defects on 15-μm-thick New Super-HAEP film with improved sensitivity to red light, was examined how it influenced on the properties of the film. It hardly affected photoconversion efficiency at the highest sensitivity, improved dark current characteristics and drift characteristics, while deteriorated lag characteristics. From these results, it is confirmed that it releases electrons out of trap levels and prevents electrons from being trapped in deep trap levels.
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宮川 和典, 大川 裕司, 松原 智樹, 鈴木 四郎, 久保田 節, 谷岡 健吉, 小林 昭, 小楠 功一, 鈴木 克彦, 平井 忠明, 河 ...
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We have developed a new polishing technology to obtain super flatness on the surface of Fiber-Optic-Plate(FOP) substrates. In the HARP tube using the newly polished FOP substrate, the avalanche multiplication phenomenon could be observed for the first time. This technology would expand the application field of the HARP imaging devices.
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瀬尾 北斗, 相原 聡, 宮川 和典, 大川 裕司, 松原 智樹, 鈴木 四郎, 久保田 節, 谷岡 健吉, 鎌田 憲彦, 照沼 大陽
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Photoconductive properties of a tris-8hydroxyquinoline aluminum (Alq_3)/perylen derivative (Me-PTC)/N, N'-Dimethyl-quinacridone (NN'-QA) layered film were studied. In the film, quantum efficiency reached about 35% at the electric field of 0.9×10^6 V/cm. From the measured gamma characteristics, it was found that the high sensitivity in the Alq_3/Me-PTC/NN'-QA layered film was caused by the carrier injection effect.
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荒木 康, 前原 佳紀, 後藤 崇, 乾谷 正史, 高田 俊二, 川人 祥二
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We have succeeded in capturing the image by a CMOS sensor fabricated with organic photoconductor. The image and the device structure will be introduced in this article.
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大石 高介, 河合 信宏, 川人 祥二
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In this paper, we propose a high resolution column parallel ADC for CMOS image sensors. This ADC has two modes. One is an integration ADC mode which is the coarse ADC, and the other is 1.5bit cyclic ADC mode which is the fine ADC. In the integration ADC mode, the output signal of the image sensor is amplified and read out as four-bit digital codes. The use of a proposed integration technique enables both the reduction of the input referred randam noise and improvement of the dynamic range of the ADC.
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河合 信宏, 大石 亮介, 川人 祥二
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In this paper, the noise reduction effect of a low-noise signal readout technique for CMOS image sensors is described. The column low-noise readout circuits have high-gain amplifiers and integrators to reduce thermal and 1/f noises. As a result of noise analysis, very low-noise level of 18.4 μVrms is estimated.
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西川 幸成, 古田 雅則, 井上 徹, 川人 祥二
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In this paper, a high-speed CMOS image sensor with a global electronic shutter and 12b column parallel cyclic A/D converters is presented. The fabricated chip in 0.25um CMOS technology achieves the full frame rate in excess of 3500 frames per second. The in-pixel charge amplifier achieves the optical sensitivity of 19.9V/lx・s and the dynamic range of 60dB.
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柳原 悠一, 今井 功, 浜本 隆之
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In this paper, we describe the image reconstruction system for image data output from an image compression sensor by using a FPGA. We also propose new method of intra-frame prediction by edge data to neighbor pixels. We evaluate the proposed method using the FPGA system.
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佐々木 達也, 香川 景一郎, 布下 正宏, 太田 淳
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セッションID: 17-1
発行日: 2006/08/01
公開日: 2017/05/24
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We are developing a CMOS image sensor suitable for low voltage driving using source-voltage modulation. In this sensor, voltage change at photodiode caused by the incident light is converted into the pulse width by applying a ramp-shaped waveform to the source node of the pixel amplifier to modulate its threshold voltage. Image acquisition by this sensor was verified.
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安達 雄大, 香川 景一郎, 高嶋 大, 谷 邦之, 和田 淳, 布下 正宏, 太田 淳
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セッションID: 17-2
発行日: 2006/08/01
公開日: 2017/05/24
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We have developed a 128×96-pixel wide-dynamic-range CMOS image sensor by fusion of active and passive pixel sensors. Characteristics and capacitances of photodiode, overflow capacitor, and switched-capacitor amplifiers of this sensor were evaluated.
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中川 琢磨, David C. Ng, 徳田 崇, 香川 景一郎, 布下 正宏, 田村 英紀, 塩坂 貞夫, 太田 淳
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セッションID: 17-3
発行日: 2006/08/01
公開日: 2017/05/24
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We have developed an implantable CMOS image sensor module for in vivo fluorescence imaging of the mouse brain. By using this device, we have successfully imaged protease expression deep inside the hippocampus of the mouse brain.
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伊藤 真也, 川人 祥二, 寺川 進
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セッションID: 17-4
発行日: 2006/08/01
公開日: 2017/05/24
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This paper presents the design and implementation of a one-chip camera device for capsule endoscopes. This experimental chip integrates functional circuits required for capsule endoscopes and digital image transmission function. A prototype image sensor chip which has 320x240 effective pixels was fabricated using 0.25μm CMOS image sensor process and the autonomous imaging was demonstrated. The chip size is 4.84mmx4.34mm. With a 2.0 V power supply, the analog part consumes 950μW and the total power consumption at 2 frames per second (fps) is 2.6mW. Error-free image transmission over a distance of 48cm at 2.5Mbps corresponding to 2fps is demonstrated with inductive coupling.
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澤田 友成, 牛永 健雄, Izhal Abdul Halin, 川人 祥二, 中山 政勝, 本間 充, 渡辺 恭志, 前田 康成
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セッションID: 17-5
発行日: 2006/08/01
公開日: 2017/05/24
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This paper presents a new type of QVGA CMOS range image sensor based on the TOF principle. A pixel structure of the sensor consists of single layer polysilicon gates on LOCOS and has a function of background light induced charge reduction. The chip was fabricated in 0.35μm standard CMOS process. The presented sensor achieves a minimum range resolution of 12.5mm at 30fps and the resolution is improved to 4.4mm for 10frames averaging, which corresponds to 3fps.
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