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779results about How to "Easy to hide" patented technology

Sound source locating method based on improved PHAT weighting time delay estimation and implementation system thereof

The invention relates to a sound source locating method based on improved PHAT weighting time delay estimation. The sound source locating method comprises the steps that a microphone array collects four paths of sound signals, the sound signals are converted into digital signals through an A/D sampling circuit, time delay estimation algorithm processing is conducted through an improved PHAT weighting generalized cross correlation function method, a time delay estimation value is obtained, a nonlinear equation system is solved through the iteration method according to the time delay estimation value and the spatial position of the microphone array, and then the relative position of a sound source is obtained. According to the sound source locating method based on improved PHAT weighting time delay estimation, the arrangement of the microphone array is similar to the arrangement of the origin of a rectangular coordinate system and fixed length points on the x-axis, the y-axis and the z-axis; the calculated quantity is small, the device requirement is low, the speed is high, and instant locating is achieved; a sound source locating system is applied to social life, the military field and other aspects such as a video session, path planning and locating of a sniper.
Owner:SHANDONG UNIV

Secret image share method based on block compressed sensing

The invention provides a secret image share method based on block compressed sensing, and belongs to the technical field of secret image share. The secret image share method based on the block compressed sensing is characterized by comprising, first of all, reading in a secret image, dividing the secret image into blocks, selecting appropriate observation rate according to channel bandwidth and requirements of users, carrying out quantization coding on obtained observed values, producing a binary system bit sequence, converting numbers of the binary system bit sequence into decimal numbers in sequence, using the decimal numbers as polynomial coefficients in a (r, m) (r and m are positive integers, and the r is equal to or less than the m ) threshold scheme of Shamir, producing shadow images with the number of the m, and sending to different actors to keep through different information channels. A receiving end only needs to receive entire or part information of the shadow images with the number of the r in the shadow images with the number of the m, carries out corresponding converse operation, and can gradually reconstruct an original secret image. The secret image share method based on the block compressed sensing is capable of flexibly applying to changes of the channel bandwidth and variety of requirements of quality of reconstructed images of users, and is applicable to transmitting secret image information under different conditions of the channel bandwidth and in application environment with requirements for compand on image quality.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Adaptive image encryption domain reversible hiding method based on hybrid encryption mechanism

The invention discloses an adaptive image encryption domain reversible hiding method based on a hybrid encryption mechanism. A user performs sequential prediction on a digital image to be encrypted toobtain the pixel type identification matrix of an original image, and adaptively selects an optimal block size of the pixel type identification matrix to generate an optimal block type identificationmatrix; a random number is taken as a secret key to combine the block type identification matrix, and 'xor plus pixel classification scrambling' is used for generating an encrypted image of the original image; the random number is taken as a secret key to encrypt partial information of the block type identification matrix, the public key of a receiver uses an asymmetric encryption algorithm to encrypt 'the random number, the residual block type identification matrix information and the optimal block size', which are then serially embedded into a variable pixel of the encrypted image; the receiver uses a private key to decrypt the extracted key information and can obtain a decrypted image the same as the original image and a plaintext image with additional information through sequence recovery. The method reduces the difficulty of secret key management, improves the security of image transmission, and brings convenience for cloud management.
Owner:SOUTHWEST JIAOTONG UNIV

Dripping arrow irrigation automatic control system, manufacturing method of dripping arrow irrigation automatic control system and dripping arrow irrigation method

The invention relates to a dripping arrow irrigation automatic control system, a manufacturing method of the dripping arrow irrigation automatic control system and a dripping arrow irrigation method. The dripping arrow irrigation automatic control system consists of a reservoir, a water pump, a water level sensor, a conveying main pipeline, a fertilization pipeline, a conveying branch pipeline, a temperature sensor, a main controller, a start controller, a water taking pressure gauge, an electromagnetic valve, a suction and exhaust valve, a fertilization control valve, a filter and a water conveying pressure gauge; the reservoir is arranged at the initial end of the conveying main pipeline; the water level sensor is arranged in the reservoir; the water level sensor is connected with the main controller; the water pump is arranged on the reservoir and is used for drawing a water source in the reservoir; the water taking pressure gauge, the electromagnetic valve, the suction and exhaust valve, the fertilization control valve, the filter and the water conveying pressure gauge are sequentially arranged on the initial section of the conveying main pipeline; the fertilization control valve is mounted on the initial section of the conveying main pipeline; a fertilizer is uniformly conveyed into the conveying main pipeline by the fertilization conveying pipeline. The dripping arrow irrigation automatic control system is scientifically designed, has a reasonable structure and uniform flow, is reasonable in system arrangement, is stable in pressure in the pipelines, has wide applicability and has a wide application range; a dripping arrow takes effects of a water dropper and an insertion arrow, has a small size and high intensity, has powerful use functionality and is convenient to mount and use.
Owner:TIANJIN WATER RESOURCES RES INST

Vertical-axis wind-driven dynamo of variable-pitch resistance and lift mixed type

The invention provides a vertical-axis wind-driven dynamo of a variable-attack angle resistance and lift mixed type, which comprises a power transfer device, a dynamo, a dynamo V-pulley mechanism, a main shaft, a sleeve, a cantilever bracket and blades, wherein the exterior of the main shaft is directly connected with the sleeve by a bearing, the sleeve is connected with the cantilever bracket which is provided with a blade rotating device, and the top end of the main shaft is provided with a wind vane; optimal attack angle control by utilizing the wind energy of the four blades which are driven by the motor is realized by a plurality of synchronous belt mechanisms; a low-pressure alternating current output by the dynamo is rectified by an inverter to output a direct current which is charged into an accumulator battery to provide the blade rotating device with a power supply; and a dogvane is connected with a controller which controls the blade rotating device. The invention adopts a vertical-axis windmill mode combining resistance type and lift type and can automatically adjust the attack angles of the blades according to a wind direction measured by the dogvane so that a blower is constantly in a state capable of generating the maximum torque, thereby effectively reducing the starting wind speed and improving the utilization rate of wind energy.
Owner:HARBIN ENG UNIV

Reconnaissance type obstacle-surmounting machine snake

ActiveCN104925159AFlexible and accurate movementImprove migration abilityVehiclesEngineeringTorsion spring
The invention discloses a reconnaissance type obstacle-surmounting machine snake, and belongs to the field of robots. Because the conventional wall climbing robots cannot surmount walls of 90 degrees, the conventional wall climbing robots are difficult to move a single step on modern buildings in a common right-angle design; the capability of surmounting obstacles is weak, so that the conventional wall climbing robots cannot perform search, inspection and maintenance tasks at dangerous locations, and the application range is narrow. In order to overcome the defects of the conventional wall climbing robots, the wall climbing machine snake is designed by combining a snake-shaped robot which is high in stability, small in cross section, and high in flexibility. The machine snake can simulate a snake to raise the head and swing the head. The machine snake can raise the head like the snake, so that the machine snake can freely turn on walls of different angles, and the mobility is high. The machine snake walks by adopting wheels, and a buffering torsion spring is arranged at each joint, so that the turning accuracy is guaranteed. On the aspect of adsorption, the machine snake is adsorbed on a wall by utilizing a vacuum negative pressure theory; through comparison and analysis, a base structure is designed, so that the adsorption is firmer. A camera can rotate 360 degrees.
Owner:河北航轮科技有限公司
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