76results about How to "Eliminate cumulative effects" patented technology

The present invention is directed generically to a means for altering the ability of the mammalian body to absorb nutritive content from ingested foodstuffs, and more specifically to an apparatus and method of use for an endolumenal sleeve (referred to also as an “intragastrointestinal device” or “gastrointestinal device”) positioned in the mammalian gastrointestinal (GI) tract. A suitable endolumenal sleeve is comprised of an anchor element and an opening at a proximal end, an elongate lumen or hollow open-ended tube having a transverse dimension, and a distal orifice. Optionally, an exterior aspect of the elongate lumen may include additional modes of attachment to the tissues walls of the GI tract through the use of one or more means for promoting tissue in-growth. The endolumenal sleeve is retained in the GI tract such that a substantial fraction of the food and liquids passing through the GI tract is channeled into the proximal opening and through an interlumenal space defined within the interior space of the endolumenal sleeve. Within the endolumenal sleeve there may be one or more restrictive means to constrain, impede or otherwise control the operative flow of material through the device. An individual restrictive means can either be of a fixed geometry or such means may include one or more elements which are adjustable in nature or function. The elongate lumen of the endolumenal sleeve is formed of a polymer composition suitable for controlled ingress of biological secretions, egress of certain selected nutritional elements, and may comprise either a single tubular structure or a multi-section (i.e. articulated and / or multiple lumen) assembly. When the endolumenal sleeve is in situ within the mammalian gastro-intestinal system, ingested foodstuffs are conveyed from the proximal end to said distal orifice. In typical applications, the proximal end of the endolumenal sleeve is positioned within the physiological region extending from the lower esophagus to the duodenum and the distal orifice is positioned within the physiological region extending from the upper duodenum to the lower jejunum, though further extension into the lower intestine is possible. Through proper selection of position for the endolumenal sleeve proximal and distal ends, combined by selection of the composition used in the fabrication of the elongate lumen, it is possible to finitely control the degree of nutritive absorption performed by the gastrointestinal tract.

The present invention is directed generically to a means for altering the ability of the mammalian body to absorb nutritive content from ingested foodstuffs, and more specifically to an apparatus and method of use for an endolumenal sleeve (referred to also as an “intragastrointestinal device” or “gastrointestinal device”) positioned in the mammalian gastrointestinal (GI) tract. A suitable endolumenal sleeve is comprised of an anchor element and an opening at a proximal end, an elongate lumen or hollow open-ended tube having a transverse dimension, and a distal orifice. Optionally, an exterior aspect of the elongate lumen may include additional modes of attachment to the tissues walls of the GI tract through the use of one or more means for promoting tissue in-growth. The endolumenal sleeve is retained in the GI tract such that a substantial fraction of the food and liquids passing through the GI tract is channeled into the proximal opening and through an interlumenal space defined within the interior space of the endolumenal sleeve. Within the endolumenal sleeve there may be one or more restrictive means to constrain, impede or otherwise control the operative flow of material through the device. An individual restrictive means can either be of a fixed geometry or such means may include one or more elements which are adjustable in nature or function. The elongate lumen of the endolumenal sleeve is formed of a polymer composition suitable for controlled ingress of biological secretions, egress of certain selected nutritional elements, and may comprise either a single tubular structure or a multi-section (i.e. articulated and / or multiple lumen) assembly. When the endolumenal sleeve is in situ within the mammalian gastro-intestinal system, ingested foodstuffs are conveyed from the proximal end to said distal orifice. In typical applications, the proximal end of the endolumenal sleeve is positioned within the physiological region extending from the lower esophagus to the duodenum and the distal orifice is positioned within the physiological region extending from the upper duodenum to the lower jejunum, though further extension into the lower intestine is possible. Through proper selection of position for the endolumenal sleeve proximal and distal ends, combined by selection of the composition used in the fabrication of the elongate lumen, it is possible to finitely control the degree of nutritive absorption performed by the gastrointestinal tract.

The invention discloses a flexibility motion control IP (Intellectual Property) core and an implementation method thereof, belonging to the field of motion control. The IP core comprises a acceleration / deceleration module, an interpolation module, a pulse counting module, a pulse generation module, a bus controller and an RAM (Random Access Memory) interface module. The flexibility motion control IP core and the implementation method thereof aim to solve the problems that high speed and high precision cannot be achieved due to incapability of further reducing a control period since a motion control algorithm has a long running period in a general MCU (Micro Controller Unit) or DSP (Digital Signal Processor). The IP core has the characteristics of short control period and high output pulse precision, non-symmetrical linear acceleration and deceleration can be achieved, non-symmetrical S-shaped curve acceleration and deceleration can be achieved, two-axis or three-axis linear interpolation with the linear or the S-shaped curve acceleration and deceleration can be achieved, and two-axis arc interpolation at an uniform speed also can be achieved. Through the adoption of the IP core, motion control relevant algorithm is realized in a Verilog hardware description language soft core mode, the motion control relevant algorithm can be implemented in an FPGA (Field Programmable Gate Array), can be implemented in an ASIC (Application Specific Integrated Circuit) mode, and can be integrated into SoC (System On Chip), the typical working frequency is 100MHz, and feasibility is provided for building a flexibility motion control system.

A mechanism for producing turbulent flow of the air moving over the rear deck of a vehicle is an air flow control apparatus comprising a vehicle spoiler of a typical and well known type having a horizontal portion joined integrally with spaced apart vertical standoffs. Mounted between the standoffs is a rotating spinner held in bearing sets. The spinner provides blades configured for rotating the spinner when the vehicle moves using its slipstream.

The invention provides a single event upset resisting reinforcing system used for an FPGA (Field Programmable Gate Array). The single event upset resisting reinforcing system comprises a clock pulse source, a backward read refresh controller, an external configuration input unit, an FPGA, a PROM (Programmable Read Only Memory) and an external communication interface, wherein the clock pulse source, the external configuration input unit, the FPGA, the PROM and the external communication interface are respectively connected with the backward read refresh controller; the clock pulse source provides a clock pulse for the backward read refresh controller; the external configuration input unit is used for configuring initial data of the system through inputting a selection signal; original configuration data of the FPGA is stored in the PROM; the backward read refresh controller is used for loading, backwards reading and refreshing the configuration data of the FPGA; the external communication interface is an interface for sending a remote control command to the system and receiving a telemetering command of the system, which is provided for a user.

The invention discloses a bidirectional layered sample pressing device for preparing a consolidation test sample and a sample pressing method thereof. The device is formed in the following manner: the inner wall of a guide cylinder is sleeved with a pressurization piston, the bottom surface of the flange of the pressurization piston is joined with the top of the guide cylinder, a cutting ring groove is formed in a position below the pressurization piston on the inner wall of the guide cylinder, the top of a cutting ring is embedded in the cutting ring groove of the guide cylinder, and the diameter of the cutting ring is equal to that of the pressurization piston; the cutting edge of the cutting ring is embedded in the hollow cavity of a circular ring-shaped projection on the top of a base; one or two disk-shaped cushion blocks are embedded in the inner cavity of the cutting ring; the distance between the bottom surface of the flange of the pressurization piston and the lower end face of the pressurization piston, the height of the inner wall above the cutting ring groove of the guide cylinder and the height of the cushion block are equal to 1 / n of the height of the cutting ring, and n is layering time in a test sample pressing process and is equal to 3 or 4. The pressing density of the test sample pressed by the device is more uniform, and interference caused by friction force of the ring wall in a sample loading process is small, so that the test data error of a consolidation test is small, and the test result is more accurate and reliable.

A UUV tracking method for a moving mother ship based on nonlinear model predictive control, which relates to a tracking control method for an underactuated UUV for a moving mother ship. In order to solve the problem of low accuracy of the existing method for processing the linear model when controlling the UUV, the present invention first establishes a prediction model of the underactuated UUV level and corresponding constraints; The tracking control problem of driving UUV to the moving mother ship is transformed into an optimization problem under constraint conditions; and the optimization problem under constraint conditions in step 3 is processed by using Taylor series expansion and Lie derivative, and the obtained analytical solution is used as UUV tracking The control input of the system; in each prediction time domain, update the analytical solution in step 4 with the new state value, and continue to run until the UUV completes the tracking operation of the moving mother ship. The invention is applicable to the tracking control of the underactuated UUV to the moving mother ship.

The invention discloses a cultivation method for rice direct dibble seeding in wedged ditches, which belongs to the field of rice cultivation. In order to solve the problem that yield potential of high-yield high-quality varieties is difficult to fulfill by existing cultivation methods, the cultivation method for rice direct dibble seeding in wedged ditches includes the steps: firstly, tilling soil, namely performing no turning or irrigation after preceding harvesting, and digging a field to obtain a plurality of ditches, wherein row spacing between each two adjacent ditches is 18-22cm, each ditch in a triangular shape is wide end up, each ditch is 5-20cm deep and 3-6cm wide, two sides of each ditch are slopes relative to the horizontal plane, and an included angle between each slope and the horizontal plane is 40 DEG-70 DEG; secondly, post-treating rice seeds; thirdly, performing base fertilizer application, direct dibble seeding, and irrigation; and fourthly, performing field management. The traditional ploughing is replaced with wedging, so that farming intensity is reduced, interference to soil is lowered, energy sources are saved, labor is reduced, seeds for use are few, soilwater retention capacity is high, soil system stable is high, fertilizer utilization rate is high, root system growth environment is improved, and cost reducing, yield increase and efficiency enhancement are achieved.

It is an object of the present invention to provide a driving circuit which is adapted, for a semiconductor device which exhibits a diode characteristic of flowing an abrupt current if the gate-source voltage therein exceeds a predetermined voltage, to have the functions of reducing electric-power consumption in high-load state, reducing the loss in the driving circuit in low-load states, preventing excessive voltages, excessive currents and excessive electric-power consumption, and reducing the loss in the semiconductor device. A gate control part (2, 12, 22, 32) in a driving circuit is adapted to control the voltage or the current which is supplied to the gate of a semiconductor device, according to signals indicative of operation states of the semiconductor device (1), wherein these signals are inputted from an operation-state detection part (4, 5, 6) which detects operation states of the semiconductor device, and the semiconductor device exhibits a diode characteristic of flowing an abrupt current if the gate-source voltage therein exceeds a predetermined voltage.

An electrolytic generator for producing hydrogen and oxygen switches polarities of electrodes to minimize the accumulation of electroplated electrode material driven from one electrode to the other. The generator contains two or more electrolytic cells in a lower portion, with an upper portion, including gas receiving receptacles. Preferably, water extends upward past a division between the upper and lower portions. In a first version, the upper portion, which is attached for gas collection through flexible hoses, is moved from one cell in the lower portion to another when the polarity is switched. In a second version, the upper portion remains stationary while the lower portion is moved to another upper portion as the polarity is switched.

Disclosed is a fluorine-based surfactant which is composed of a copolymer that is obtained by copolymerizing, as essential monomers, (A) a polymerizable monomer that has a poly(perfluoroalkylene ether) chain and a polymerizable unsaturated group at each end of the chain and (B) a polymerizable monomer that has an oxyalkylene group and a polymerizable unsaturated group. Because of the structure thereof, the fluorine-based surfactant does not produce PFOS or PFOA that is highly accumulative in the environment or in a living organism. In addition, the fluorine-based surfactant exhibits more excellent surface tension lowering ability even with a lower fluorine content in comparison to surfactants that have a fluorinated alkyl group with 8 or more carbon atoms. Consequently, the fluorine-based surfactant is suitable for use as a leveling agent for a coating composition, a resist composition and the like.

The invention discloses a paper-making and pulping midcourse wastewater decolorizing pretreatment process, and the process comprises the following steps of: guiding the wastewater into an anaerobic reactor for anaerobic treatment, transforming part of organics having the biochemical ability in the wastewater into methane and carbon dioxide, and reducing lignin substances that have no biochemical ability in the wastewater; guiding the effluent water treated by the step (1) into a coagulation chamber, and adding a composite coagulant in the coagulation chamber to promote the condensation of lignin substances in the wastewater; and guiding the effluent water treated by the step (2) into a sedimentation tank for separating mud and water. The pretreatment process has advantages of simple process, good decolorizing effect, low cost, stable reaction process and good treatment effect, meanwhile, the adoption of the process can directly recycle water through the pretreatment and then advanced treatment to the wastewater.

The invention relates to the technical field of gangue treatment, in particular to a gangue treatment method and application. The treatment method comprises the steps of pickling gangue powder; addingwater for granulation after removing pyrites from the gangue powder, and obtaining gangue based microspheres; dipping the gangue based microspheres in solutions containing ferric salt and zinc salt,and obtaining dipped microspheres; performing ozone aeration and ultrasonic treatment to the dipped microspheres, and obtaining activated gangue microspheres; adding alkali to the activated gangue microspheres for solid-liquid separation, and obtaining activated gangue; and mixing the activated gangue and sodium alginate aqueous solutions, and obtaining gangue engineering soil through drying. Recovery and reuse of gangue are achieved, and the pyrite content of the end-product gangue engineering soil is reduced obviously; the phenomena of heat accumulation and gangue heating, even spontaneous combustion in the later accumulation process can be avoided greatly; the security threat is reduced, and the mechanical property of the gangue engineering soil is excellent, and can be applied to grainfor green land, engineering construction land and high-grade highway construction projects.

A mechanism for producing turbulent flow of the air moving over the rear deck of a vehicle is an air flow control apparatus comprising a vehicle spoiler of a typical and well known type having a horizontal portion joined integrally with spaced apart vertical standoffs. Mounted between the standoffs is a rotating spinner held in bearing sets. The spinner provides blades configured for rotating the spinner when the vehicle moves using its slipstream.

The invention discloses a transistor vertical-cavity surface-emitting laser (T-VCSEL), and belongs to the technical field of an integrated photoelectronic device. The T-VCSEL comprises a buffer layer, a lower end face distributed Bragg reflector, a collector region, a base region, an emitter region and an upper end face distributed Bragg reflector which are successively arranged according to an epitaxial growth sequence. The T-VCSEL also comprises a collector, a base electrode and an emitter electrode which are connected with the collector region, the base region and the emitter region. A quantum well active region is arranged in the base region. The collector is arranged on the back of the buffer layer. The buffer layer and the lower end face distributed Bragg reflector are equipped with doping types same as the doping type of the collector region. According to the T-VCSEL, the length of the transmission path of carriers in the collector region is reduced from the existing tens of microns to several microns, and the carriers are imported from the emitter region; therefore, the bad influence of the voltage drop of an internal resistor on the control of the working state of the device can be effectively reduced; and moreover, the transverse distribution of the potential in the collector region is improved.

The invention discloses a system and a method of synchronous acquisition of ocean seismic data, the method of the synchronous acquisition of the ocean seismic data includes: a shipborne control platform sending a main clock to a marine seismic streamer interface board; the marine seismic streamer interface board receiving the main clock and distributing the main clock to all digital packets on the marine seismic streamer in sequence through a command data channel; when the shipborne control platform sends commands to the digital packets on the marine seismic streamer to trigger signals through the marine seismic streamer interface board, and the digital packets delaying clocks in the digital packets according to the delay compensating parameter delta t and enabling the times at which all the digital packets to execute the commands sent by the shipborne control platform to be identical. The problems that clock frequency of the digital packets in a distributed ocean seismic survey system is inconsonant and data acquisition is affected due to the fact that the acquisition times of seismic data are inconsonant are solved.

The present invention relates to a keratin fibers conditioning composition, comprising: (a) at least one(C10-C30)alkylamido(C1-C8)alkyl(di)(C1-C6)alkylamine and their cosmetic salts and their solvates such as hydrates; (b) at least one dicarboxylic acid containing at least one hydroxyl group, preferably two hydroxyl groups, the said dicarboxylic acid not bearing a cyclic group; (c) at least one high melting point fatty substance having a melting point of 25 °C or higher; and (d) at least one aqueous carrier.

The invention discloses a super-resolution reconstruction method based on half-error reverse projection. The method comprises steps that M actual observation images are acquired; an initial high resolution image is calculated; according to the actual observation images and the initial high resolution image, a (t+1)-times iteration high resolution image is acquired; simulation observation of the high resolution image is carried out to acquire a corresponding simulation observation low resolution image, and an error between a (t+1)-times iteration actual observation image and the simulation observation low resolution image is calculated; the error or the actual observation image is projected to the high resolution image in a reverse mode; iteration stops when the satisfactory result is acquired. The method is advantaged in that the accumulation effect of ringing pseudo shadow can be effectively reduced, and the reconstructed high resolution image is made to have better quality and vision experience. The invention further discloses a super-resolution reconstruction device based on half-error reverse projection.

The Fenghuang capsule for treating gout is prepared with 12 kinds of Chinese medicinal materials, including dry bee chrysalis, rhubarb, plantain seed, oriental water plantain, achyranthes root. Etc in certain weight proportion, and through drying, grinding into fine powder, 60 mesh sieving and encapsulating. It has the functions of dispelling wind and dampness, promoting blood circulation, cooling blood, dredging meridian, eliminating swelling, relieving pain, promoting excretion of blood uric acid and reducing accumulation of purine matter inside body. It has high effective rate and no toxic side effect.

A semiconductor device has emitter regions disposed in at least one cell region in a first inter-trench region, not disposed in a middle inter-trench region, and disposed in at least one cell region in the second inter-trench region. Each of the emitter regions is disposed at a position that is not in contact with first trenches but is in contact with two second trenches defining the corresponding cell region.

The process of making composite substrate for micro stripe gas chamber detector is one RF plasma aided chemically vapor deposition process to deposit diamond-like film onto D263 glass. Optical glass D263 via pre-treatment is first deposited inside high vacuum reaction chamber and then annealed in a nitrogen atmosphere furnace to produce composite substrate. By means of applying bios, increasing magnetic field and annealing treatment, the present invention obtain high quality composite diamond-like / D263 glass substrate. The present invention overcomes the stress between the film and the substrate, lower combining force and other problems, and has less detector charge accumulating effect and high substrate stability.

A disc brake having an anchor bracket fixed to a vehicle, a rotor fixed to and rotatable with a wheel and a caliper that spans the disc and supports a pair of opposed braking pads with respect to the rotor. Parallel alignment members fixed to the caliper and having a corresponding set of generally parallel bores for receiving the alignment members in the anchor bracket to allow limited relative movement and caliper translation during a brake application and subsequent release. Plastic inserts disposed intermediate an alignment member and a corresponding bore to provide a desired minimum running clearance there between. The plastic inserts being formed and remaining in situ within the respective bores through a sprues or gate that extend from and are generally transversely to a bore to align the alignment members with the bores and corresponding the braking pads with the rotor.

Modularized clock decoupling and signal delay management is provided for the purpose of reducing simultaneous binary signal switch-induced inductive voltage transients in lower voltage synchronous semiconductor devices. The voltage levels in low-voltage devices must be tightly maintained for proper transistor logic operations. Signal switching results in current changes on the power net of an IC. Current changes produce inductive voltage transients which propagate throughout the device and which can interfere with signal transmission and device operation. Relatively independent functioning circuits of an integrated circuit are isolated from the chip clock and each isolated circuit module is provided with its own independent, same-frequency, but slightly out-of-phase clock signal. Signal switching within any module is thus occurring out-of-phase with that of all other modules and, as a result, switch-associated voltage transients are limited to those associated with one module's circuits at a time.

Modularized clock decoupling and signal delay management is provided for the purpose of reducing simultaneous binary signal switch-induced inductive voltage transients in lower voltage synchronous semiconductor devices. The voltage levels in low-voltage devices must be tightly maintained for proper transistor logic operations. Signal switching results in current changes on the power net of an IC. Current changes produce inductive voltage transients which propagate throughout the device and which can interfere with signal transmission and device operation. Relatively independent functioning circuits of an integrated circuit are isolated from the chip clock and each isolated circuit module is provided with its own independent, same-frequency, but slightly out-of-phase clock signal. Signal switching within any module is thus occurring out-of-phase with that of all other modules and, as a result, switch-associated voltage transients are limited to those associated with one module's circuits at a time.

The invention belongs to the field of direct-current cable accessory materials, and particularly relates to a silicon rubber-based non-linear cable accessory material and a preparation method thereof.The preparation method comprises the following steps: firstly, preparing copper calcium titanate particles in certain particle size through a sol-gel method and by carrying out high-temperature calcination and ball milling; secondly, dispersing the copper calcium titanate particles in double-component liquid silicon rubber through in-situ polymerization; finally, carrying out hot-pressing and vulcanization forming, thus preparing the silicon rubber-based non-linear cable accessory material. The silicon rubber-based non-linear cable accessory material prepared by the invention has excellent conductance nonlinearity and relatively stable direct-current breakdown electric field strength and is capable of effectively improving conductance gradient between different materials, increasing the transportation capability of a current carrier and weakening an accumulative effect of space charges in the position of an interface, so that removing of local electric field distortion can be realized, electric field distribution in a cable accessory can be homogenized, the accessory insulation performance can be enhanced, the failure occurrence probability can be reduced, and the service life ofthe cable accessory can be prolonged. The preparation method and needed equipment are simple, the cost is low, and implementation is easy.

The invention discloses a cultivation method for wedge plowing and transplanting rice, belonging to the field of rice cultivation. To solve the problem of the low yield of high-yield high-quality varieties in the exiting cultivation mode, the cultivation method of the invention comprises the following steps: (1) plowing soil; not carrying out plowing and watering after harvesting former crop in rotation; and digging a plurality of ditches on a surface of a farmland, wherein the row spacing between two adjacent ditches is 20cm, the ditch is narrow at the bottom and wide at the top and has an inverted triangular shape, the depth of the ditch is 5-10cm, the width of the ditch is 3-6cm, the two side faces of the ditch are all oblique planes relative to a horizontal plane, and the included angle alpha is 40-70 degrees between the oblique plane and the horizontal plane; (2) applying base fertilizer, transplanting seedlings, and watering; and (3) subsequently managing the field. The cultivation method of the invention reduces the farming intensity by using wedge plowing instead of traditional ploughing, applies fertilizer to the bottom of the wedge-type ditch in a centralized way, reduces the disturbance to the soil, is energy-saving and labor-saving, has large water storage capacity of the soil and high soil system stability, increases the utilization ratio of fertilizer, improves the growth environment of root system, and realizes the effects of saving cost and increasing yield and efficiency.

The invention discloses a method for eliminating direct-current deviation of an ultrasonic echo signal. The method comprises steps that S1, a chip controls a transmitting module to divide the transmitted ith scanning line into an odd number group and an even number group, one group of transmitting lines is controlled to transmit positive polarity or negative polarity pulses, the other group of transmitting lines is controlled to transmit reverse phase pulses, i = 1, 2,..., M, and M is a positive integer larger than or equal to 2; S2, a receiving module receives the pulses transmitted in the step S1, and the two groups of transmitted echo signals are summed to obtain harmonic signals; S3, the harmonic signals obtained on the M scanning lines are spliced to obtain a final harmonic signal; and S4, the received pulse waves are analyzed and processed by the chip to obtain a defect graph of the to-be-detected workpiece, and the defect graph is displayed through a display. The method is advantaged in that purposes of eliminating direct-current deviation and enhancing the signal-to-noise ratio are both achieved, and complexity of ultrasonic echo signal processing is lowered.

The invention discloses an exhaust emission and pollutant near-zero emission system and method used in a carbon industry. The system comprises a carbon exhaust purification treatment system, a boiler and a boiler exhaust purification system and further comprises a flue connecting system. A combustion air compensation unit is arranged on the flue connecting system. According to the method, after exhaust of a mixed kneading, forging and roasting purification unit and exhaust of an ingredient exhaust purification unit are mixed, the mixed exhaust as combustion-supporting gas is introduced into the boiler; when the set temperature and blast capacity requirements are met, the mixed exhaust is fully burnt in a hearth, exhaust combustion supporting is achieved in the carbon industry, and the exhaust emission and the pollutant near-zero emission is achieved; and meanwhile, the calorific value of asphalt fume and CO in the exhaust is reused, and the energy saving and emission reduction effects are achieved. The exhaust emission and pollutant near-zero emission system and method provide a new thought and method for the pollutant control and pollutant emission reduction in the carbon industry.

An existing video information hiding algorithm is summarized, an H.265 intra-frame prediction coding method is analyzed, an H.265 video information hiding method based on a coupling coefficient pair is provided. 1-bit data is embedded into an embedding coefficient of a DST / DCT coupling coefficient pair, corresponding compensation coefficients are compensated, and propagation and accumulation of errors in a block are controlled. According to the method, the video effect is greatly improved under the condition of the same embedding amount; the invention proposes the H.265 video information hiding method based on the texture features; the texture features of images are analyzed, coupling coefficient pairs and the texture features are combined, all reference pixels of a reference block cannot transmit embedding errors to adjacent prediction blocks, the problem of intra-frame distortion drift is fundamentally solved, and the method is simple and efficient; the method is suitable for high-super-definition videos and low-resolution videos at the same time, embedding of secret information can not be perceived by naked eyes while high information embedding capacity and good visual secret performance are obtained, and the influence on code streams is small.