Sumitomo Electric Industries, Limited

Tokyo Metropolitan University

Yokohama National University

Kiya, Hitoshi

Yoichi Hata

Toshiaki Kakii

Yoshimitsu Goto

Yasuhito Fujita

Hitoshi Kiya

Isao Kato

Yoshikazu Isoyama

Takumi Asaina

Takanori Miyoshi

Satoru Sakurazawa

Hisao Maki

Kiyoshi Nishikawa

Masaaki Fujiyoshi

Tsutomu Matsumoto

Shoko Imaizumi

A detection device includes: a switch provided to a transmission path that connects a plurality of function units to each other; a measurement unit configured to measure a signal that passes the transmission path, at a first node on a first end side of the switch and at a second node on a second end side of the switch; and a detection unit configured to compare a measurement result at the first node and a measurement result at the second node, which are obtained by the measurement unit, with a reference measurement result which is a measurement result for reference, and detect abnormality regarding the transmission path, based on a result of the comparison.

Detection device, management device, detection method, and detection program

A security system includes an information transmission device, and a security device to which a target device is connectable. The information transmission device and the security device are connected to each other via a network. The information transmission device transmits, to the security device, generation information to be used for generating reference identification information. The security device generates the reference identification information by using the generation information received from the information transmission device via the network. The security device acquires identification information of the target device connected to the security device. The security device compares the acquired identification information with the generated reference identification information, and determines validity of the target device connected thereto, based on a result of comparison.

Security system, vehicle, security device, and validity determination method

A vehicle-mounted communication system is mounted in a vehicle and includes a plurality of functional units connected to a control network in the vehicle and a management device connected to a security network in the vehicle. Communication from the control network to the security network is partially limited. The vehicle-mounted communication system further includes a data acquisition device that acquires data transmitted through the control network and transmits the data to the management device. The management device detects an abnormality related to the control network based on the data received from the data acquisition device.

Vehicle-mounted communication system, data acquisition device, management device, and monitoring method

A detection system includes: a signal output unit configured to output, to a measurement target, a measurement signal that exhibits a predetermined temporal change; a signal measurement unit configured to measure a response signal, to the measurement signal, from the measurement target; a calculation unit configured to calculate an impulse response of the measurement target, based on a measurement result of the response signal measured by the signal measurement unit; and a detection unit configured to detect abnormality regarding the measurement target, based on the impulse response calculated by the calculation unit.

Detection system, detection device, and detection method

A connector system is provided with a first connector including a first transmission line, and a second connector including a second transmission line. The second connector includes a processing unit configured to perform an information transmission process of creating information regarding verification, and transmitting the information to the first connector. The first connector includes: a switch configured to, in a state where the first connector and the second connector are connected to each other, select whether or not to electrically connect the first transmission line and the second transmission line to each other; a verification unit configured to perform a verification process of verifying the second connector, based on the information received from the second connector; and a control unit configured to control the switch, based on a result of the verification process.

Connector system, connector, and connection method

The present invention relates to a displaying method for video image coded data which prevents deterioration of image quality of a video image as much as possible, and conceals, from an observer, deteriorated video quality caused due to a transmission error. The displaying method selects target image frames to be decoded and target image frames to be discarded, by performing error determination () in parallel with an error recovery process and other image restoration processes, and decodes () only the selected target image frames. A predetermined display device sequentially displays () only the decoded target image frames while adjusting a frame rate.

Video image coded data display method, device, and communications system

The present invention relates to a moving-picture image data-distribution method that suppresses increases in processing loads at respective information terminals without being affected by an uneven distribution status of processing loads that changes over time or by a bandwidth status of a connected network. During a distribution operation of moving-picture image data from transmission-side information terminals () to a reception-side information terminal (), when the reception-side information terminal () repetitively issues a transmission requirement for moving-picture image data at a predetermined time interval to the transmission-side information terminals (), the reception-side information terminal () calculates, in advance, at least any one data amount of an own receivable amount of image frames and an own permissible load amount as reception-limit information, and subsequently sequentially notifies the transmission-side information terminals () of an upper limit of at least any one of the data amount and a data structural element that is used as a basis for calculation of the data amount.

Moving-picture image data-distribution method

The present invention relates to a traffic control apparatus and the like for optimizing a communication performance of each of local networks to be monitored. The traffic control apparatus () temporarily stores in the memory () communication band information items of relay nodes (B,B,B) through the I/O (). The controller () specifies a bottleneck relay node based on the obtained communication band information items, calculates transmittable/receivable bands to be allocated to the PCs (B), and notifies the PCs (B) of the calculated transmittable/receivable bands. In response to this notification, the PCs (B) divide data to be transmitted, with the divided data corresponding to the allocated bands, and transmit the divided data to the Internet (), in a manner that the divided data are arranged temporally evenly.

Traffic control apparatus and data communication system including same

A master key (K) inputted by an input unit is stored in a storage unit. A matrix generating unit generates key element matrices (M-M) with respect to each of split keys (e, e, e) obtained by a key dividing unit dividing the master key (K). To each coordinate entry of the key element matrices (M-M), operation data that successively obtained by repeating a hash operation with a one-way hash function is assigned, so as to maintain hierarchical nature of scalability (L). A key generating unit generates partial keys (K-K) corresponding to respective hierarchies of the scalabilities (R, L), on the basis of the key element matrices (M-M). These partial keys (K-K) are outputted to a coding unit or a decoding unit by an output unit.

Encryption key generation device

The present invention relates to an image processing method and image inspecting method with high versatility which enable efficient and highly accurate proof of authenticity of a digital image. The image processing method subjects at least a part of a digital image which can exist temporarily or continuously in a falsification-vulnerable environment, to a first morphology operation using a predetermined structuring element, to process the digital image. The image inspecting method subjects the digital image thus processed, to a second morphology operation using the same structuring element as in the first morphology operation. The morphology operations have the idempotent and the presence or absence of falsification can be detected by determining identity of images before and after the second morphology operation.

Image processing method and image inspecting method

This invention relates to a coding method for motion-image data and others effective in a special interactive environment for transmitting motion-image data with information concentrated on only a partial region of a display image as in a two-way interactive system implementing real-time two-way interaction. The coding method involves dividing an image frame forming motion-image data into a plurality of rectangular regions, and grouping each of these rectangular regions into a preset ROI and a non-ROI. These rectangular regions are sequentially compressed so that a code length of a rectangular region grouped into the ROI is larger than a code length of a rectangular region grouped into the non-ROI, thereby generating coded data of each image frame.

Coding method for motion-image data, decoding method, terminal equipment executing these, and two-way interactive system

The invention relates to a videoconference system and others of structure enabling smooth progress of interlocution even in distance interlocution among many people through a plurality of terminal devices. The videoconference system is a network system enabling transmission and reception of data by several types of media through a plurality of terminal devices connected by a transmission means, and is provided with a management table for managing users of the respective terminal devices in a state in which the users are sorted in an interlocutor mode for interlocutors mainly engaged in progress of a specific subject and in an observer mode for observers other than the interlocutors, and a communication control means for editing interlocution information by media selected from interlocution information among users sorted in the interlocutor mode and delivering the edited information to the terminal devices of the respective users sorted in the observer mode.

Growing community of inventors

Yokohama, Japan

Yoichi Hata