Zhejiang Dahua Technology Co., Ltd.

Zhejiang Lab

Xingming Zhang

Jun Yin

Jun Wu

Jian Wu

Jiangming Zhu

Liquan Fu

Xiangming Zhu

Zhicheng Ye

Wei Lu

Qiankun Li

Huadong Pan

Shizhu Pan

Miao Cheng

Nan Hao

Feng Wang

Tao Xu

Kai Liu

Hongxing Ding

Yinchang Yang

Yongdong Zhu

Weigang Chen

Qian Zhang

Zhenting Li

Fujun Zhang

Bin Yang

Bingyun Lv

Weizhong Yao

Mengmeng Liu

Shanyun Liu

Yun Xie

Zhangwei Zhou

Kainan Zhu

Peijun Chen

Yinan Qi

Zhuqiang Bao

Chenge Liao

Jingang Lu

A method and a device for improving pipeline safety of a space-terrestrial network architecture. The method pre-registers the profile of a base station in the network repository function network element of a 5G core network; after receiving a relay pipeline connection establishment request initiated by a base station, a relay satellite sends a network function verification request to the network repository function network element through a network expose function network element; after receiving a response to a network function discovery request of the base station, the network expose function network element sets the corresponding verification result of the base station according to whether there is base station registration information and responds to a verification request of the network element; and finally, the relay satellite verifies the verification result cell carried in the received response to determine the legality of the current access to the base station.

Method and device for improving pipeline safety for space-terrestrial network architecture

The present disclosure provides methods and apparatuses for improving user security of satellite-ground integrated network systems. On the basis of the satellite-ground integrated network pipeline only authenticates a terminal in a satellite-ground integrated network, a two-stage authentication based on CA digital certificates and user characteristic information is put forward for users and services using the terminal. The two-stage authentication includes: firstly, when a first spatio-temporal information ciphertext digest obtained from spatio-temporal information ciphertext in a service request by using a digest algorithm is consistent with a second spatio-temporal information ciphertext digest obtained by decrypting a digital signature in the service request using a user public key, the user is legal; furthermore, when spatio-temporal information characteristics obtained by decrypting the spatio-temporal information ciphertext using a private key of the satellite-ground integrated core network are consistent with spatio-temporal characteristics in the digital certificate, the verification succeeds.

User security improvement in satellite-ground integrated network system

Disclosed is a two-phase access authentication method integrating spatial-temporal features in space-air-ground integrated networks. In the method, an access authentication is divided into two phases: a primary authentication phase and a continued authentication phase. In the primary authentication phase, a user equipment and a satellite are respectively initialized and registered through a ground network control center. In the authentication phase, a fast and secure access is achieved by using a user ID, facial features, and other authentication factors. In the continued authentication phase, data of a user flow and behavior features are acquired, and feature comparison is performed by using historical user data; and a security level and an authentication decision are output. According to the disclosure, the spatial-temporal features are integrated to perform access authentication on a satellite-ground communication network, the authentication not only achieves a fast access, but also continuously ensures the system security in a service phase.

Two-phase access authentication method integrating spatial-temporal features in space-air-ground integrated networks

Systems and methods for lane detection are provided. The methods may include obtaining an image and determining, for each of a plurality of pixels in an image, a semantic category using a trained semantic segmentation network. The methods may further include determining one or more pixel sets based on the plurality of pixels according to a predetermined rule. Each of the one or more pixel sets includes one or more pixels of a same semantic category. The methods may further include, in response to a determination that there are one or more erroneous pixels in a pixel set, removing the one or more erroneous pixels from the pixel set to obtain a fitting line corresponding to a lane line. The methods may further include determining a position of the lane line based on the fitting line.

Systems and methods for lane detection

A system and method for jointly displaying an image and a map is disclosed. The method may including obtaining an image captured by a camera. The image may include a target in a surrounding environment of the camera. The method may further include obtaining a map of the surrounding environment. The map may at least include a location corresponding to the target and a location corresponding to the camera. The method may jointly display the image and the map, wherein a representation of the image is aligned with the location corresponding to the target and the location corresponding to the camera in the map.

Systems and methods for image display

A system for video surveillance includes an image sensor configured capture an image including a reference zone and a memory device that stores instructions. The system also includes one or more processors that are configured to execute the instructions to determine 3D coordinates of a target comprised in the image and determine 3D coordinates of the reference zone. The one or more processors are further configured to identify an event according to the 3D coordinates of the target and the 3D coordinates of the reference zone.

Methods and systems for video surveillance

A method relating to image compression includes acquiring image data of an image, wherein the image includes a matrix of pixels, and the image data include pixel values of the matrix of pixels. The method also includes generating, based on the image data, a first-level data set including pixel values of a portion of the matrix of pixels. The method further includes determining at least one coding mode for the first-level data set, encoding the first-level data set into a code stream based on the at least one coding mode, and packaging the code stream into a modified code stream.

Methods and systems for image compression

A zoom lens system for providing high quality images with higher resolution includes a first lens group (), an aperture stop (), and a second lens group (). The first lens group has a positive or negative refractive power, and includes at least two lens elements having a negative refractive power and at least on lens element having a positive refractive power. The second lens group has a positive refractive power. A distance between a first and second lens group is not fixed.

Zoom lens system

Provided in embodiments of the present invention are a method and device for implementing high-definition image capturing, comprising: collecting and acquiring image data of a first set format by using an image sensor, image processing the image data then encoding into modulated data of a second set format, converting the modulated data into an analog electric signal of a third set format by using a synchronous clock, and filtering the analog electric signal by using a filter circuit then transmitting via a coaxial cable. The above series of operations is capable of implementing the collection and processing of a high-resolution video, and solves the problem that existing high-definition camera are incapable of ensuring timeliness during a video transmission process and provides poor stability and reliability, while at the same time, employment of the present invention also allows an existing analog camera to use a cable device for video transmission, thus implementing full utilization of existing resources.

Method and device for implementing analog high-definition image capturing

The invention relates to the art of communications and particularly to a video signal transmission method, apparatus, system and terminal, where the method includes: separating a current raw digital video signal acquired by a video camera core into a luminance signal and a chrominance signal; converting the luminance signal and the chrominance signal into an analog video signal; transmitting the analog video signal to a master control chip board through an electrically-conductive slip ring; and converting the analog video signal back into the current raw digital video signal in the master control chip board. With the video signal transmission method, apparatus, system and terminal according to embodiments of the invention, the integrity of the transmitted video signal can be improved to thereby guarantee the quality of the video signal.

Video signal transmission method, device, system and terminal

A method and an apparatus for sending and receiving audio data, so as to solve the problem that in the prior art, a simulating audio and video transmission system is complex in cable connection structure. The audio data is overlaid at a preset position of a video blanking interval of video data, sending and receiving of audio signals are carried out, and co-cable transmission of the audio and video data can be achieved.

Method and apparatus for sending and receiving audio data

Disclosed are a video signal attenuation equalization circuit, a video signal processing apparatus, and a control device and method, which are used for solving the problem that the transmission of an analog video signal is distorted after the analog video signal is transmitted by a coaxial cable, so as to guarantee low signal distortion after the video signal is transmitted at a long distance. The video signal attenuation equalization circuit provided in the embodiments of the present invention comprises: a signal driving circuit, an equalization unit and an analog switch unit, wherein the signal driving circuit is connected to the equalization unit and the analog switch unit, and is used for receiving and strengthening an initial video signal, and sending the obtained strengthened initial video signal to the equalization unit and the analog switch unit; the equalization unit is used for performing attenuation equalization on the strengthened initial video signal according to the triggering of a control signal, and after the attenuation equalization sending the video signal to the analog switch unit; and the analog switch unit is used for outputting the strengthened initial video signal or the video signal sent by the equalization unit after the attenuation equalization according to the control of the control signal.

Video signal attenuation equalization circuit, processing apparatus, and control device and method

Disclosed are a high-definition digital video signal transmission method and device, a high-definition digital video camera and a video acquisition device. The technical solution provided in the embodiments of the present invention comprises: transcoding a high-definition digital video signal in accordance with a line-by-line sequence at a sending end to obtain an analogue video line signal, and sending analogue video line data which is obtained by conversion; and receiving the analogue video line data at a receiving end, and conducting decoding conversion on the received analogue video line data to obtain high-definition digital video line data. The present invention can convert a high-definition digital video signal into an analogue video signal to conduct transmission, thereby being able to solve the problem that a high-definition digital video signal cannot be transmitted for a long distance in the existing high-definition digital video monitoring technology.

High-definition digital video signal transmission method and device, camera and acquisition device

Provided in embodiments of the present invention are a method and device for transmitting a high-definition video signal, comprising: isolating from the high-definition video signal a brightness signal and a chrominance signal, and, by using an analog signal transmission mode, using non-overlapping frequency hands to transmit respectively the brightness signal and the chrominance signal. The solution of the present invention employs the analog signal transmission method, utilizes independent frequency bands to transmit respectively the brightness signal and the chrominance signal, and ensures that the brightness signal and the chrominance signal do not affect each other, thus ensuring video quality and timeliness of the high-definition video signal when transmitted over a long distance.

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Hangzhou, China

Xingming Zhang