Ricoh Company, Ltd.

Haihua Yu

Wei Wang

Bin Da

Hong Yi

Yan Sun

Ke Liao

Weitao Gong

Linju Yang

Liyan Liu

Chaofeng Li

Xin Wang

Tian Ji Yang

Yi Sun

Xiaojing Fan

Yupeng Zhang

Yindong Zhang

Hongyi Liu

A device authentication method, a service access control method, a device, and a non-transitory computer-readable recording medium are provided. In the device authentication method, an authentication request device issues an authentication request transaction in a distributed ledger, and an authentication response device reads the authentication request transaction in the distributed ledger and performs authentication. Thus, no third-party authentication center or coordinate device is required to participate in an authentication handshake process, thereby reducing deployment overhead of an authentication system and improving efficiency of authentication and access service control.

Device authentication method, service access control method, device, and non-transitory computer-readable recording medium

A load balancing method, an access controller and a load balancing system are provided. The method includes receiving load status association information from a plurality of APs in a wireless local area network, respectively, the load status association information including load information and connectivity information, and the connectivity information being information for indicating one or more UEs that can be connected to an AP corresponding to the load status association information; determining, based on the load status association information, load statuses of the APs, and obtaining, using the load status association information, a load balancing connection scheme for balancing loads of the APs, when the load statuses satisfy a predetermined condition; and determining, based on the load balancing connection scheme, a correspondence relation between a specific UE and one of the plurality of APs to connect a UE and a corresponding AP.

Load balancing system with an access controller in the field of communication technology

An area restricted access system, method, and non-transitory computer-readable storage medium are provided. The system includes an access device and a first service device located in a service area, wherein the access device locates a user device via a first type of wireless signals and obtains a first location parameter. The first service device monitors and locates the user device via a second type of wireless signals and obtains a second location parameter. The area restricted access system generates a modified location parameter based on the first and the second location parameters and determines whether the user device is within or out of the service area based on the modified location parameter. The first service device allows the user device to access the first service device when the user device is within the service area, and forbids the user device to access the first service device when the user device is out of the service area.

Area restricted access system, method and non-transitory computer-readable storage medium

Camera device and method for shooting light having at least two wavelength bands are disclosed. The camera device includes a first camera containing a first lens for receiving light having a first wavelength band; a second camera including a second lens for receiving light having a second wavelength band which is different from the first wavelength band, the second lens being disposed facing the first lens of the first camera; and a parabolic mirror set between the first camera and the second camera, able to let the light having the first wavelength band penetrate therethrough, and at the same time, reflect the light having the second wavelength band. The first camera is a non-fisheye camera. The first lens is a non-fisheye lens. The second camera and the parabolic mirror form a catadioptric camera. The aperture stop of the non-fisheye lens coincides with the focal point of the parabolic mirror.

Camera device having a parabolic mirror set between dual cameras and method for shooting light having at least two wavelength bands

An image processing method include projecting first and second images which are captured by two fisheye lenses onto first and second hemispherical projection models, respectively; determining a set of waiting-for-stitching surface region pairs on the first and second hemispherical projection models; extracting feature points from the two fisheye images and determining feature points matching each other to serving as pixels matching each other; determining a set of surface region pairs including the pixels matching each other on the first and second hemispherical projection models as the set of waiting-for-stitching surface region pairs; generating a customized projection model on the grounds of the set of waiting-for-stitching surface region pairs by letting a spherical distance between vertexes of each pair in the set of waiting-for-stitching surface region pairs be zero; and generating a third image by projecting the first and second images onto the customized projection model.

Dual fisheye, hemispherical image projection and stitching method, device and computer-readable medium

A method, an apparatus and an electronic device for processing a panoramic image are provided. The method includes converting a first planar projection image of the panoramic image into a spherical image; determining a position of a region of interest in the spherical image; and cutting and expanding the spherical image based on the position of the region of interest in the spherical image, and obtaining a second planar projection image of the panoramic image. A distance between the region of interest in the second planar projection image and a center point of the second planar projection image is shorter than a distance between the region of interest in the first planar projection image and a center point of the first planar projection image.

Method, apparatus and electronic device for processing panoramic image

Three dimensional image fusion method and device are disclosed. The method includes steps of obtaining a spherical image and a two dimensional image; projecting the two dimensional image onto a planar surface predetermined in a spherical coordinate system where the spherical image is located, so as to acquire a projected image having a predetermined number of feature points on the spherical surface corresponding to the spherical image; determining multiple mapping points on the spherical surface which correspond to the predetermined number of feature points, letting the predetermined number of feature points superpose on the multiple mapping points, respectively, and carrying out spatial coordinate conversion, so as to attain a converted image; and mapping multiple points except the predetermined number of feature points in the converted image onto the spherical image based on a predetermined mapping relationship, so as to fuse the two dimensional image onto the spherical image.

Three dimensional image fusion method and device and non-transitory computer-readable medium

Disclosed is a method of recognizing a user of at least one mobile device by using an imaging device. The method comprises a first obtainment step of obtaining first positional information of the user of the at least one mobile device by using the imaging device; a second obtainment step of obtaining both second positional information and ID information of the at least one mobile device; a comparison step of comparing the first and second positional information so as to obtain a comparison result; and a determination step of determining, based on the comparison result, whether or not to let the ID information of the at least one mobile device be associated with the user of the at least one mobile device.

Method and device for recognizing user of mobile device

Disclosed is a relative orientation angle calculation method comprising steps of obtaining inertial sensor data of first and second mobile devices, the first mobile device being capable of sending a first signal to the second mobile device; obtaining a sending frequency that the first signal has when the first mobile device sends the first signal to the second mobile device; obtaining a receipt frequency that the first signal has when the second mobile device receives the first signal sent from the first mobile device, the first signal receiving influence of the Doppler effect in a sending process in which the first signal is sent to the second mobile device from the first mobile device; and calculating, based on the inertial sensor data, the sending frequency, and the receipt frequency, a relative orientation angle between the first and second mobile devices.

Relative orientation angle calculation method and device as well as relative positioning method

Disclosed are a verifier used in a mobile node and a method of controlling plural states of the mobile node. The verifier comprises a secret key receiving part configured to listen and receive at least one secret key from at least one secret key transmitter in an area limited Ad-hoc network; a secret key stamp generating part configured to perform calculation on the at least one secret key according to a predetermined verification rule so as to generate a secret key stamp; and a secret key stamp verifying part configured to compare the secret key stamp and a predetermined standard value, wherein, if the secret key stamp is equal to the predetermined standard value, then the secret key is determined as valid, otherwise, the secret key is determined as invalid.

Method of controlling states of mobile node and verifier therein for receiving secret key

Disclosed are an area-limited self-organized wireless network management method, a communication apparatus, and a system. The method comprises a step of, when a communications apparatus which is entering the limited area receives area signals for indicating a specific area in which network nodes are located, determining by the communications apparatus whether the master node exists in the limited area; a step of, if it is determined that the master node exists, performing identity authentication with regard to the master node and letting the communications apparatus itself be a sub node by the communications apparatus; and a step of, if it is determined that the master node does not exist, letting the communications apparatus itself be the master node by the communications apparatus, wherein, the master node is in charge of entering of a new sub node and synchronization of shared secret keys between the network nodes.

Area-limited self-organized network management method, communications apparatus, and system

Disclosed are a wireless network area limiting method and a wireless network area limiting system based on NFC. The wireless network area limiting method includes a step of adopting a plurality of first NFC hot spot sensors to seamlessly define a limited area having any shape; a step of periodically generating and transmitting an area secret key by a first central control part respectively connected to the plurality of first NFC hot spot sensors; and a step of conducting handshake with the first central control part by a WLAN user equipment, which has a NFC function and is located in the limited area, based on the area secret key received by the WLAN user equipment, so that the first central control part establishes area-limited network communications in the limited area.

Wireless network area limiting method and system based on near field communication

A transmitting device, a receiving device, a wireless communication system and a method for controlling the wireless communication system are used for creating a secure wireless communication network of a limited area. The transmitting device comprises: one or more transmitters configured to transmit wireless signals, and create the limited area by a coverage scope of the wireless signals; a cryptography key generating unit configured to generate a cryptography key for the wireless signals; a cryptography key encoding unit configured to encode the cryptography key to a cryptography key frame; and a cryptography key scheduling unit configured to schedule the cryptography key frame so as to control the transmitter to transmit the wireless signals including the cryptography key frame.

Transmitting device, receiving device, wireless communication system and method for controlling wireless communication system

A method and an apparatus for determining a projection area of an image are provided. The method for determining a projection area of an image, comprises: an input step of inputting an image sequence having a plurality of images; a detecting step of detecting locations of projection areas of the respective images in the image sequence; a relationship classification judging step of judging a relationship classification between the image and a previous image before the image being projected based on a relationship between the location of the projection area of the image and the location of the projection area of the previous image; and a determining step of determining the locations of the projection areas of the respective images based on the relationship classification judged in the relationship classification judging step.

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Beijing, China

Haihua Yu