52results about How to "Verify robustness" patented technology

The invention relates to an MATV-feature-based face living-body detection method. The method comprises: a training set video is read and decomposed, a face region of each frame is extracted and is processed by normalization for inputting, a magnitude-angle-total-variation (MATV) optical flow filed feature based on a magnitude-angle variational method is employed, the feature is coded by using a statistical histogram to obtain an MATV histogram feature, and then the MATV histogram feature is inputted into an SVM classifier to carry out training and an SVM model is established; and for a face video frame sequence of a test set, face detection is carried out on each frame, the face region of each frame is extracted and normalization is carried out to obtain a test set face frame sample, an MATV histogram feature of the face frame sample is calculated and then is inputted into a trained SVM model, and a face living-body detection result is predicted. According to the invention, on the basis of the traditional magnitude-feature-based optical flow method, the angle feature is added and the direction characteristic of the optical flow field is considered, thereby obtaining more living-body and non-living-body face motion details. Therefore, the accuracy of the face living-body detection is improved.

The invention discloses a 422 bus solid-liquid power aircraft flying control testing system. The 422 bus solid-liquid power aircraft flying control testing system comprises a main control testing platform, a portable measurement and control box, a flying control computer, an emulation computer and an interface machine; the main control testing platform provides a human-computer interaction interface and sends a testing command to a flying control computer; the portable measurement and control box outputs the testing command to the flying control computer after performing isolation transferring on the testing command signal to achieve flying control computer power supply, analog acquisition output and switching value signal input and output channel functions; the flying control computer performs sub-system testing and control to perform flying control algorithm resolving and generate into rudder deflection control quantity; the emulation computer simulates the aircraft to perform model real-time resolving; the interface machine perform data fusion and sending. The 422 bus solid-liquid power aircraft flying control testing system can achieve full-system semi-real-object testing, comprehensive monitoring of bus information, real-time storage and display of data, obtains possible conditions during flying to examine in advance and lays foundation for smooth execution of flight tests.

The invention provides a network protocol safety test method and device, electronic equipment and a storage medium. The method comprises the following steps: establishing a plurality of protocol models of a plurality of protocol layers of a protocol set based on an original message of the network protocol set; generating a plurality of variation messages according to the plurality of protocol models and variation strategies; sending the variation message and the background flow message to the equipment to be tested; and monitoring a transmission process of the to-be-tested device in receivingthe variation message and the background flow message so as to judge whether the to-be-tested device is safe or not.

The invention discloses a pi-network-based millimeter wave frequency band receiver with an electrostatic discharge protection function, and belongs to the field of radio frequency and millimeter wave integrated circuit designing. The receiver comprises an electrostatic discharge (ESD) protection circuit consisting of back biased diodes, a low-noise amplifier (LNA) in a two-stage amplification structure, mixers of branch circuits I and Q, gain variable amplifiers of the branch circuits I and Q, a balun and an output ESD protection circuit consisting of the back biased diodes. Connection relationships among the circuits are that: the ESD protection circuit is connected in series with the LNA; the other end of the ESD protection circuit is an input end; the other end of the LNA is connected with the common input end of the two mixers of the branch circuits I and Q; the input end of the balun is a local oscillation (LO) end, and the output end of the balun is connected with the two local oscillation signal input ends of the mixer of the branch circuit I; the output ends of the mixers of the branch circuits I and Q are connected with the input ends of the gain variable amplifiers of the two branch circuits respectively; and the output ends of the gain variable amplifiers are connected to the final output end of the circuit after passing through the ESD protection circuit. By the invention, the electrostatic reliability of the circuit of the receiver can be ensured, and the overall performance of broadband input matching, high gain and low noise of the receiver can be improved.

The verification system for fast autonomous deep-space optical navigation control prototype belongs to the field of semi-physical simulation system based on virtual reality. It includes the autonomous optical navigation control and dynamic simulation system to be verified with the selected landed planet and area to generate the navigation information and control command of deep-space detector to complete the dynamic simulation of the deep-space detector; a target simulating system to generate the 3D virtual environment the deep-space detector faces and to be shown in the display based on the detector information produced through dynamic simulation; and an optical navigation camera system to take the image on the display and to drive the generation of next step of deep-space detector navigating information and control command and complete the dynamic simulation of the deep-space detector.

The invention discloses a monocular vision-based lane line detection and tracking method. The method comprises the following steps of: A, image acquisition; B, image preprocessing; C, detecting whether the image is a first frame image, if yes, sending the image into a first frame image lane line detection module, and if not, sending the image into a tracking process lane line detection module; andD, detecting output results of the first frame image lane line detection module and the second frame image lane line detection module, determining whether the first frame image lane line detection module and the second frame image lane line detection module are the last frames, if yes, ending, and if not, returning to the tracking process lane line detection module for reprocessing. According tothe invention, the research work of lane line detection can be completed. And the lane line detection tracking work of the video stream is completed, and the real-time performance and robustness of the video stream are verified.

The invention discloses a visual positioning hardware-in-the-loop simulation platform and simulation method. The visual positioning hardware-in-the-loop simulation platform comprises an automatic driving simulation system, a darkroom scene system and a visual positioning system, the visual positioning system comprises a visual positioning calculation platform and a camera, and the visual positioning calculation platform is in communication connection with the automatic driving simulation system; the visual positioning calculation platform obtains virtual sensor data and a virtual scene high-precision map from the automatic driving simulation system; and the darkroom scene system comprises a darkroom, a high-definition display screen and a camera in the visual positioning system are placed in the darkroom, the high-definition display screen is connected with the automatic driving simulation system through a video line, the camera is placed in front of the high-definition display screen, and the camera collects videos displayed on the high-definition display screen by the automatic driving simulation system in real time. The visual positioning computing platform and the camera are connected into the system, hardware-in-the-loop simulation is achieved, and the real drive test condition is simulated to the maximum extent.

The invention discloses a model body and a calibration method suitable for geometric correction of a general trajectory cone beam CT system. The calibration method comprises the following steps: constructing back projection line coastal introduction auxiliary parameter virtual intersection points of a small ball at different angles based on projection data of the small ball; constructing a target function of the back projection line intersection degree according to the virtual intersection point; expanding the objective function to obtain a sum objective function of the N small balls; the optimal solution of the sum objective function is solved through an optimization algorithm, and initial three-dimensional coordinates of the mass centers of the N small balls are obtained; and registering and averaging the initial three-dimensional coordinate values of the N small balls based on a rigid motion registration algorithm of singular value decomposition to obtain an accurate three-dimensional coordinate value which is used as a reference value of the geometric calibration method of any track. The method aims at accurately obtaining high-precision space parameters of the die body without depending on machining precision, and further provides a calibration die body for geometric correction of a common track cone beam CT system, especially a high-resolution cone beam CT system.

The invention discloses an ignition algorithm verification test device for an air bag restraint system controller, which can replace a trolley test for verification of impact strength and ignition algorithm of the air bag restraint system controller in early stage of development of the air bag restraint system controller. The test device comprises four modules, including a test stand rack, a pendulum bob impact acceleration mechanism, a test pulley component and a data acquiring module; the test stand rack comprises a main test stand rack, a pulley slide way and a pulley buffering device; the test stand rack acts as a component for bearing load in the test; the pendulum bob impact acceleration mechanism comprises a handheld electromagnet, a pendulum bob, a pendulum rod vernier device, a pendulum rod and an oscillation angle measurer; the pendulum bob impact acceleration mechanism acts as a power output component in the test; the test pulley component comprises a pulley, an energy absorption cylinder fixing seat and an energy absorption cylinder; the test pulley component acts as an automobile for simulating impact and a carrier of an air bag restraint system controller sample; and the data acquiring module comprises an acceleration sensor and a speed measurer and is used for acquiring the test data in the test. The algorithm verification test device disclosed by the invention has the advantages of simple structure, low cost, convenience in operation and high efficiency, etc.