Abstract: A similar image retrieval system stores image data of picked-up images; extracts features of the respective picked-up images to store with the image data; specifies a key image; and retrieves an image having a high similarity with the key image by evaluating similarities between the key image and the picked-up images based on a feature of the key image and those of the picked up images. The system includes: a unit for assigning a keyword to each image; a first image retrieval unit for retrieving a similar image to the key image while excluding an image with the keyword from a retrieval target; and a second image retrieval unit for retrieving a similar image to the key image while taking only an image with the keyword as a retrieval target.

Abstract: An image search apparatus includes: an image feature extraction unit for extracting features of images; an image search data storage unit for storing the features of the images; a user interface unit for inputting an image search condition, and displaying a search result; and an image search execution unit for executing an image search, by using the features of the images based on the image search condition, wherein the user interface unit allows multiple key images to be inputted as the single search condition, the image search execution unit executes the search by using key images included in the single search condition, and the user interface unit displays the search result in the order of similarities to the key images.

Abstract: A radio transmitter/receiver having a QoS control unit for outputting the transmission data in order taking the quality of service (QoS) into consideration. In the case where the information transmission rate for a radio section is not lower than a threshold value, the QoS control operation of the transmission data is omitted, and the transmission data are output in the order of input. In the case where the information transmission rate for the radio section is lower than the threshold value, on the other hand, the QoS control mode is switched in accordance with the information transmission rate for the radio section.

Abstract: On the basis of state change information acquired by one of sensor nodes forming a sensor network, an instruction indicative of emitting a signal is issued to another node to acquire a photographed image from a camera. An image processing device identifies the ID and actual position of the node by issuing the signal issuance instruction to the node and detecting a signal obtained from the node from the photographed image. On the basis of personal information stored in a database, the image processing device detects a not-allowed action.

Abstract: An encrypted data communication system for communicating an encrypted stream as an encrypted data stream from a device at transmitting end to a device at receiving end to suppress the effect of an erroneous detection of a dummy code is disclosed. A device at transmitting end generates a data stream having the bit sequence of a marker for determination, a synchronization marker and a location identification code after the data, encrypts the bit sequence of the data and the marker for determination and transmits the encrypted stream. A device at receiving end receives the encrypted stream, detects the bit sequence of the synchronization marker and the location identification code and decrypts the encrypted stream. In the case where the bit sequence of the data and the marker for determination is decrypted, the detection of the valid bit sequence is determined, while the detection of a dummy bit sequence is determined otherwise.

Abstract: Data to be encrypted is effectively encrypted by a data delivery system for encrypting the data to be encrypted with a transmitting apparatus and decrypting a cipher thereof with a receiving apparatus. In a configuration for encrypting and decrypting the data to be encrypted by using a random number sequence generated by a random number generating portion for generating the random number sequence uniquely decided from an input parameter, the transmitting apparatus generates the input parameter to perform encryption based on metadata of the data to be encrypted while the receiving apparatus generates the input parameter to perform cipher decryption based on the metadata embedded in the data to be encrypted.

Abstract: An efficient signature technology is provided, which is capable of arbitrary extraction and storage from a plurality of pieces of data and which can make a signature length relatively short. In a signature device (180), a mathematical function computing unit (190) repeats processing of calculating a hash value from a coupled value obtained by coupling together hash values calculated from each of the plurality of pieces of data to calculate one hash value (h), and calculates a signature value from the calculated one hash value. Then, a signature processing unit (189) generates, for one piece of data contained in the plurality of pieces of data, a signature containing the calculated signature value and a hash value coupled to another hash value calculated from the one piece of data before the one hash value (h) is calculated.

Abstract: A video distribution system that distributes encrypted video data, using improved encryption keys. A master content key is set as the highest-order key. One or more elements (unique camera ID, generation number, access list, time), and the order thereof, are set for the generation of keys (unique camera key, camera generation key, channel key, session key) that are of a lower order than the highest-order key. A hierarchical key system is used that is implemented by using element by element to generate keys of a gradually lower order than the highest-order key in accordance with the set order of the elements. The lowest-order key (session key) is used for data encryption and decryption.

Abstract: An error correction encoding rate selection table is provided in an error correction processing unit of a packet transfer apparatus, and the table stores an error correction encoding rate preset to maintain a desired QoS in correspondence with a protocol type and an application type. When a transmission packet is transferred to a wireless transmission path, an encoding control unit judges the protocol type and application type of a transmission packet from a header of the transmission packet, in accordance with a judgment result and the error correction encoding rate selection table, an error correction encoding rate is selected, and the transmission packet is subjected to error correction encoding and transferred.

Abstract: A radio transmitter/receiver having a QoS control unit for outputting the transmission data in order taking the quality of service (QoS) into consideration. In the case where the information transmission rate for a radio section is not lower than a threshold value, the QoS control operation of the transmission data is omitted, and the transmission data are output in the order of input. In the case where the information transmission rate for the radio section is lower than the threshold value, on the other hand, the QoS control mode is switched in accordance with the information transmission rate for the radio section.

Abstract: A radio transmitter/receiver having a QoS control unit for outputting the transmission data in order taking the quality of service (QoS) into consideration. In the case where the information transmission rate for a radio section is not lower than a threshold value, the QoS control operation of the transmission data is omitted, and the transmission data are output in the order of input. In the case where the information transmission rate for the radio section is lower than the threshold value, on the other hand, the QoS control mode is switched in accordance with the information transmission rate for the radio section.

Abstract: On the basis of state change information acquired by one of sensor nodes forming a sensor network, an instruction indicative of emitting a signal is issued to another node to acquire a photographed image from a camera. An image processing device identifies the ID and actual position of the node by issuing the signal issuance instruction to the node and detecting a signal obtained from the node from the photographed image. On the basis of personal information stored in a database, the image processing device detects a not-allowed action.

Abstract: An encrypted data communication system for communicating an encrypted stream as an encrypted data stream from a device at transmitting end to a device at receiving end to suppress the effect of an erroneous detection of a dummy code is disclosed. A device at transmitting end generates a data stream having the bit sequence of a marker for determination, a synchronization marker and a location identification code after the data, encrypts the bit sequence of the data and the marker for determination and transmits the encrypted stream. A device at receiving end receives the encrypted stream, detects the bit sequence of the synchronization marker and the location identification code and decrypts the encrypted stream. In the case where the bit sequence of the data and the marker for determination is decrypted, the detection of the valid bit sequence is determined, while the detection of a dummy bit sequence is determined otherwise.

Abstract: Data to be encrypted is effectively encrypted by a data delivery system for encrypting the data to be encrypted with a transmitting apparatus and decrypting a cipher thereof with a receiving apparatus. In a configuration for encrypting and decrypting the data to be encrypted by using a random number sequence generated by a random number generating portion for generating the random number sequence uniquely decided from an input parameter, the transmitting apparatus generates the input parameter to perform encryption based on metadata of the data to be encrypted while the receiving apparatus generates the input parameter to perform cipher decryption based on the metadata embedded in the data to be encrypted.

Abstract: An error correction encoding rate selection table is provided in an error correction processing unit of a packet transfer apparatus, and the table stores an error correction encoding rate preset to maintain a desired QoS in correspondence with a protocol type and an application type. When a transmission packet is transferred to a wireless transmission path, an encoding control unit judges the protocol type and application type of a transmission packet from a header of the transmission packet, in accordance with a judgement result and the error correction encoding rate selection table, an error correction encoding rate is selected, and the transmission packet is subjected to error correction encoding and transferred.

Abstract: A radio transmitter/receiver having a QoS control unit for outputting the transmission data in order taking the quality of service (QoS) into consideration. In the case where the information transmission rate for a radio section is not lower than a threshold value, the QoS control operation of the transmission data is omitted, and the transmission data are output in the order of input. In the case where the information transmission rate for the radio section is lower than the threshold value, on the other hand, the QoS control mode is switched in accordance with the information transmission rate for the radio section.

Abstract: A wireless bridge selects wireless bridges, each with communication quality at a predetermined level or higher, from other wireless bridges, which are located in a range where the wireless bridge can communicate, as wireless bridges to which a spanning tree protocol (STP) is applied. The wireless bridge adds a MAC header, where a broadcast or multicast address is a forwarding destination address, to a packet to be multicast to a plurality of wireless bridges and transmits the packet from a wireless interface as a multicast-service packet.

Abstract: A radio data communication system includes a transmitter which transmits data at a predetermined transmission rate and has a table determining transmission rates in correspondence with reception levels of data, and a receiver which receives data transmitted from the transmitter. The receiver detects data error of the data transmitted from the transmitter and transmits detecting result of the data error to the transmitter. The transmitter obtains a transmission failure rate in response to the detecting result of the data error transmitted from the receiver, and changes the transmission rate with reference to the table based on the transmission failure rate.

Abstract: A cordless telephone system includes one base station and at least one personal station. Each station includes an abbreviated dial memory for storing abbreviated dial data, a control unit for controlling the telecommunication device, an abbreviated dial transfer unit for selectively transmitting in radio the abbreviated dial data stored in the abbreviated dial memory to another telecommunication device, and a unit for receiving abbreviated dial data transmitted from another telecommunication device and writing the abbreviated dial data into the abbreviated dial memory. By using an empty channel of communication in progress or a control channel which can be freely used by a user, abbreviated dial data are transferred between stations.

Abstract: An echo suppressor for a communication system wherein a signal sent to a transmitting line is returned to a receiving line with some delay. The suppressor comprises an attenuator for attenuating the amplitude of a received speech signal. The transmitting speech signal amplitude level is compared to the amplitude of a receiving speech signal, and according to the result obtained, a signal for controlling the signal attenuation of the attenuator is generated. The delay time, until the attenuation control signal operates on the attenuator according to a change in the amplitude level of the receiving speech signal, is controlled. The controlled delay time is normally held at a predetermined maximum value, and is minimized when a change in amplitude of the receiving speech signal indicates a beginning of speech. Thus, an echo of the speech uttered by a near end user can be suppressed without impairing a beginning of the speech signal uttered by a far end user.