32results about How to "Precise rate control" patented technology

The invention discloses an H264-based real-time mobile video service control method, which belongs to the field of real-time streaming media and mobile network transmission. The method includes the following steps: a real-time video is coded according to H264, a low bit rate and low resolution, the coded H264 video data are then packed, the processed video data is transmitted to a mobile terminal according to the real-time stream transmission protocol, a three-phase bit rate control method is adopted, the status of a mobile network channel is detected and fed back by a transmission control mechanism in the process of transmission, and according to feedback information, bit rate control is carried out at the coding end. Finally, the transmitted video data is decoded and displayed by the mobile terminal. The method can effectively guarantee the real-time mobile video service quality in a mobile network environment.

The invention discloses SSIM (structural similarity) based HEVC (high efficiency video coding) video coding rate distortion optimizing and rate control algorithms. The SSIM based HEVC video coding rate distortion optimizing algorithm includes: adopting an SSIM based video evaluation method, and calculating video distortion DSSIM to acquire a lagrangian multiplier lambda in a rate distortion optimization model; calculating rate distortion rate in video coding through the lambda. The rate control algorithm adopts a secondary R-Q model in the video coding to represent relation between texture residual bits and edge information code rate in video coding bit streams, coding parameters QP in the rate distortion model and update values of video sequence characteristic parameters of alpha and beta during coding are calculated. With the algorithms, code rate can be further lowered under the condition that image quality is kept constant, and the acquired bit streams are smoother.

The invention relates to the technical field of vacuum coating and in particular relates to a coating device with multiple evaporation sources and a coating method thereof. The coating device is characterized in that a plurality of film thickness controllers are arranged in a vacuum coating chamber; one film thickness controller is arranged in the central position of a workpiece umbrella stand and is used for monitoring coating rates on coating substrates; and the rest of the film thickness controllers correspond to the evaporation sources one to one to respectively monitor and adjust the evaporation rate of each evaporation source. The coating device has the advantages that the coating device achieves simultaneous coating of multiple evaporation sources and accurately controls the coating rates and evaporation angles of the evaporation sources; the device has a simple and reasonable structure and a high degree of automation and is convenient to use; and coated multi-component films have good uniformity and high quality.

The invention discloses a system and a method for testing the mechanical-electrical coupling effect of an electrical conducting functional material . The system comprises an electrical conducting functional material sample, a sample electrode, an insulation tape, an external wire on the electrode, a sample clamping device, a displacement sensor, a transmission shaft, a driving motor, a force sensor, a handheld four-point probe, a digital source meter B, a digital source meter A and a DC power supply, wherein an integral load-displacement curve can be obtained through accurate control of parameters such as voltage strength, conduction time and loading speed; mechanical and electrical properties such as elasticity modulus, tensile strength, elongation at break, yield strength, integral volume resistivity and micro-area volume resistivity distribution of a material under the action of different force fields and electric fields can be obtained through further calculation. Therefore, measurement and analysis of the mechanical-electrical coupling effect of the electrical conducting functional material can be realized accurately and reliably, and the system and the method are suitable for electrical conducting functional materials such as conductive macromolecule, piezoceramics, a polymer-matrix composite, a ceramics-matrix composite, and a metal-matrix composite.

The invention discloses a testing system for a shield tunnel excavation face stability-losing centrifugal model test under the seepage condition. An FBG sensor of the testing system guides out a signal through an optical fiber grating, an advanced optical fiber grating sensing technology is used for the shield tunnel excavation face stability-losing centrifugal model test under the seepage condition firstly, the change characteristics of supporting force of the excavation face in the shield tunnel excavation face stability-losing process can be obtained in high-precision and real-time modes, and actual shield tunnel construction is guided. The displacement and retreat rates of an excavation face plate are controlled precisely in real time in a centrifugal field through a geotechnical centrifuge manipulator, the shield tunnel excavation face stability-losing centrifugal model test at different tunnel longitudinal slope angles is achieved through the geotechnical centrifuge manipulator and an angle adjusting device, the conception is ingenious, implementing is easy, and the testing system is reasonable in scheme, simple in structure and conventional in use equipment, and has good economic benefits and social benefits.

The invention relates to a compressive-sensing-based on-satellite real-time image synthesis compression system, which comprises n compressive-sensing measurement modules and a measurement data synthesis module, wherein each compressive-sensing measurement module carries out random measurement on original row image data X output by a corresponding channel of a multichannel TDICCD (Time Delay and Integration Charge Coupled Device) by using a Bernoulli random measurement matrix to obtain compressed measurement data Y; and the measurement data synthesis module synthesizing measurement data Y of all channels into an entire row of compressed image measurement data. According to the invention, the data of each channel of the multichannel TDICCD is compressively sensed on satellite to obtain compressed data to be synthesized and transmitted to the ground, and a complex compressive sensing restructing algorithm is carried out on ground. A complex data recovery algorithm on ground is used to exchange a simple and reliable on-satellite image compression method, so that the work frequency of on-satellite circuits is reduced, and the stability of an on-satellite image integration circuit is improved, and meanwhile, on-satellite hardware resources are saved.

The invention discloses a precise rate control method for intra-frame coding and relates to the technical field of digital image and video coding. The rate control method for intra-frame coding comprises the steps of: dividing a frame of images into block groups; describing complexity of the block groups by utilizing a sum of absolute values of gradients among adjacent pixel points in the block groups, and determining a quantization step of each block group by using an index model for a ratio of a coding data amount to the complexity. Therefore, rate control at the block group level is realized, and the purpose of precise control on the rate is realized.

The invention discloses a video coding rate control method. The method is as follows: during the process of coding current frame image, computing characteristic value of each macro block of the current frame image; computing prediction complexity and complexity level of the previous frame having the same type with the current frame image; using the prediction complexity and complexity level of the previous frame for computing the complexity level of the current frame image, combining with complexity level of the current frame image, virtual reference encoder and target bitrate for computing QP-INDEX of the current frame image; after obtaining QP-INDEX, changing the QP-INDEX value of the frame level of the current frame image into the QP-INDEX value table of one arithmetic progression, and quantizing the macro block of the current frame image. The method implementation is simple, has relatively good degree of association to movement scene and can be directly used for video encoder.

The invention belongs to the video encoding field and provides a code rate control method and a code rate control device. The objective of the invention is to solve the problem of incapability of accurately controlling a code rate caused by large deviation of an overall code rate and a target code rate which is further caused by a situation that code rate deviation cannot be timely corrected in the prior art. The method includes the following steps that: parameters required by the encoding of an encoder are received and configured; and the encoder is controlled to encode the n-th GOP unit of video data according to the parameters and calculate the cumulative rate deviation of the first GOP unit to the n-th GOP unit; and the target code rate of the (n+1)-th GOP unit is adjusted according to the cumulative rate deviation until the encoding of the video data is terminated. According to the code rate control method and the code rate control device provided by the technical schemes of the invention, the cumulative rate deviation of GOP units of which the encoding has been completed currently is calculated, and the target code rate of the next GOP unit is adjusted according to the cumulative rate deviation, and therefore, the overall code rate can be dynamically controlled in a video encoding process so as to be made approximate to the target code rate, and code rate accurate control can be realized.

The invention provides a manufacturing method of a thin film chip and the thin film chip thereof. The manufacturing method comprises the following steps: providing a luminescent epitaxial wafer composed of a growth substrate and a luminescent epitaxial laminating layer, and manufacturing a plurality of chip structure layers on the luminescent epitaxial laminating layer, wherein cutting channels are defined on the surface of the luminescent epitaxial laminating layer between the adjacent chip structures; marking off groove structures on the cutting channels in advance, and running through the groove structures to the interior of the growth substrate; thinning according to the dimensions of the groove structures along the back face of the growth substrate until the growth substrate is removed and the luminescent epitaxial laminating layer is exposed out; carrying out simplified treatment, and separating the luminescent epitaxial wafer into a plurality of thin film chips.

The invention relates to the field of metal or semiconductor grating and waveguides, aims at solving the problem that terahertz is transmitted at a low speed, and provides a super low terahertz waveguide. The relationship between the waveguide parameters and the transmission speed rate is confirmed through a proper theoretical method. According to the technical scheme of the super low terahertz waveguide of a local classification deep material grating super slow terahertz waveguide, a groove in a periodic format is etched on the surface of local classification deep materials, one part of the groove depth is fixed and unchanged, the other part of the groove depth changes in a classified mode, detailedly, the initial broadcasting period of the front section terahertz is a gradual-changing depth so as to reduce the speed of the terahertz broadcasting along the surface of grating, if the depth keeps changing gradually, the broadcasting speed of the terahertz can finally be reduced to zero so as to enable the terahertz to stop on the surface of the grating with gradually-changing depth, and the depth of the back half section groove is fixed and unchanged so as to enable the terahertz to broadcast at a certain speed. The waveguide is mainly used for low-speed transmission of terahertz.

The invention discloses a precise adjustable ballast device. The device comprises ballast balls, a ballast tank, a pipeline, a shell body, a front end cover, a rotating shaft, an impeller and a rear end cover; the ballast balls are located in the ballast tank, and the top of the ballast tank is provided with an opening used for adding the ballast balls; the bottom of the ballast tank is in a funnel shape, and the bottom of the funnel is connected to the upper portion of the pipeline; the two end faces of the shell body are provided with the front end cover and the rear end cover respectively,the bottom of the rear end cover is provided with an opening used for being connected with the lower portion of the pipeline; the impeller is located in the shell body, is concentric with the shell body, and comprises a plurality of blades; the rotating shaft penetrates through the shell body, the front end cover, the impeller and the rear end cover, and the rotating shaft is used for driving theimpeller to rotate; the circumference of bottom of the shell body is provided with an opening used for rolling the ballast balls out. The precise adjustable ballast device has the advantages that thecomplexity of a system is reduced, the adjustment rate and the quality can be precisely controlled, pressure-proof design is not needed, and when autonomous underwater vehicles are arranged symmetrically at the left and right, the function of rolling attitude adjustment also can be achieved.

The invention discloses a temperature and strain velocity controllable aluminum alloy compression deformation device and a testing method. The temperature and strain velocity controllable aluminum alloy compression deformation device comprises a strain velocity controllable loading device as well as a temperature controllable heating device. By adopting the device disclosed by the invention, temperature and strain velocity can be precisely controlled, an aluminum alloy ingot can be subjected to compression deformation, and the size of a test sample after compression deformation meets later mechanical testing requirements. The device disclosed by the invention is convenient to disassemble and assemble, compression tests of an aluminum alloy material sample can be implemented at different temperature and different strain velocities by using a universal testing machine, experiment reliability is improved, and the experiment cost is reduced.

The invention discloses an electric kiln used for jun porcelain firing and also discloses a method for firing jun porcelain through the electric kiln. The electric kiln comprises a kiln body which is internally provided a heat preservation liner layer and an electric heating device. The electric heating device comprises electric heating rods which are located on the left side wall, the right side wall and the rear side wall of the kiln body and are controlled by a fuzzy PID temperature controller. The kiln body is internally provided with a temperature thermocouple which is connected with the fuzzy PID temperature controller. An air inlet pipe which is provided with a float flowmeter and a smoke exhaust air channel which is provided with a regulating valve are arranged on the outer side of the kiln body. The air inlet pipe passes through a distributor and then communicates with air inlets which are located in four corners of the bottom of the kiln body. The smoke exhaust air channel communicates with an exhaust port which is formed in position, close to the center of the rear side wall of the kiln body, of the bottom of the kiln body. The regulating valve is located above the kiln body. The electric kiln is simple in structure, firm and durable, the transmutation success rate of the jun porcelain which is fired through the electric kiln is relatively high, the jun porcelain conforms to process requirements, and the quality is stable.

The invention discloses a vehicle power control system and method. The vehicle power control system comprises a control module, a monitoring module, a driving motor, a steering motor and a rotating motor. The monitoring module is electrically connected to the control module. The control module is electrically connected to the driving motor, the steering motor and the rotating motor. The vehicle power control system effectively monitors the power system of the vehicle, and transmits the monitoring information to an operation panel, a user or an intelligent automation system can give corresponding commands according to the state information and the road condition information of each tire, the direction and speed of each tire are accurately controlled, and the intelligent automatic safe driving is achieved.

The invention relates to a code rate control method based on space-time domain context and motion complexity. The method comprises the following steps of: based on a R-lambda model, performing the first-step updating on model parameters alpha and Beta of a current basic unit C0 before coding of the C0; coding the current basic unit C0; waiting for completion of coding all the basic units of a frame where the C0 is, and performing the second-step updating on the current basic unit; guiding target bits allocation of a basic unit layer with the model parameters subjected to the two steps of parameter updating; defining a relative motion complexity coefficient of the current basic unit C0 to represent motion intensity of different basic units; regulating a lambda value of the current basic unit with Wi, j of the current basic unit C0 to make the lambda value adaptive to the motion intensity of different basic units, thereby realizing the aim of allocating more bits to the basic units with higher motion intensity. The code rate control method based on space-time domain context and motion complexity can guarantee that the basic units with higher motion intensity can get more target bits, thereby facilitating improvement of quality of video.

The invention discloses a PEM water electrolysis proton membrane and CCM integrated preparation process and equipment, the equipment adopts a combination of multiple nozzles and a slit type coating head, the multiple nozzles can independently spray different components of a catalyst layer multi-component composite slurry within an ultra-short time, the spraying rate and atomization degree of the different components are accurately controlled, and the production efficiency is improved. The problem of poor dispersibility of different catalysts and binders in the catalyst slurry in the same solution is solved; the preparation process comprises the following steps of: sequentially compounding the base membrane pretreatment layer, the catalyst layer 1, the functional layer 1, the composite reinforced membrane, the functional layer 2, the catalyst layer 2 and the like on the substrate to realize the integrated preparation of the PEM water electrolysis composite reinforced membrane and the CCM catalyst layer; and finally, the PEM membrane electrode has relatively low surface resistance, relatively high conductivity, mass transfer rate and chemical durability, so that the cost of PEM electrolyzed water is reduced, and the service life is prolonged.

The invention relates to a stirring instrument capable of controlling the water content and a use method thereof. The stirring instrument capable of controlling the water content comprises a water tank, stirring blades, a stirring tank, an electrical control module, a driving device and a bracket from upper to bottom in sequence, wherein electrical control spray nozzles are arranged on the lower side of the water tank; a discharge opening is formed in the lower side of the stirring tank; the electrical control module is connected with a power supply; the electrical control module comprises a single-chip microcomputer and a power switch; the single-chip microcomputer is connected with the electrical control spray nozzles and the driving device; the stirring blades are arranged inside the stirring tank in a rotating manner through a stirring shaft. According to the stirring instrument capable of controlling water content, the working efficiency of material stirring and the uniformity of stirred soil can be improved through the utilization of the mechanical automatic stirring capability and the automatic adjusting capability; the structure is simple, the practicability is high, the production maintenance cost is low, and the popularization and application are facilitated.

The present invention relates to a hydrogen fuel cell power system of an unmanned aerial vehicle. The system comprises a reaction kettle, a hydrogen storage tank, a fuel cell, a DC/DC converter, a lithium battery, a motor, a heat exchanger and a water pipeline, an exhaust port is formed in the upper middle portion of the reaction kettle and conveys hydrogen to the hydrogen storage tank through a hydrogen pipeline, the hydrogen storage tank supplies hydrogen to the fuel cell, water vapor generated by the fuel cell is converted into liquid water through the heat exchanger and then conveyed to the reaction kettle, the fuel cell is connected with the DC/DC converter, and the DC/DC converter is connected with the lithium battery and the motor. The fuel cell and/or the lithium battery supplies power to the motor.

The invention discloses a slurry mixing and oil stirring device for sesame oil processing. The device comprises a shell, wherein a grinding area is arranged on the upper portion in the shell, a slurrymixing area is arranged below the grinding area, a slurry fixing area is arranged at the bottom of the slurry mixing area, a grinding mechanism is mounted in the grinding area, a slurry mixing and stirring device is mounted in the slurry mixing area, a bottom lifting device used in cooperation with the grinding mechanism is further installed on the upper portion of the interior of the shell, a fixed slurry stirring device is mounted in the slurry fixing area, the left side and the right side of the shell are each provided with a water conveying mechanism, a control device is arranged in the shell, and the left side and the right side of the bottom of the slurry mixing and stirring device are each provided with a sensor assembly. According to the invention, the device is high in automationdegree, the internal electric assembly is matched with the control device to achieve accurate control over the internal stirring speed and the processing temperature, the grinding and stirring effectis good, the processing efficiency is improved, and the sesame oil outlet quality is further improved.

The invention relates to an H264 macroblock-level code rate control method and device and a readable storage medium. In the H264 macroblock-level code rate control method, if a code rate control switch is in an on state and a target coding code rate is greater than 0, when code rate control is performed on a current BU unit of a current frame, the following steps are performed: judging whether an unallocated coding code rate of the current frame is less than 0; if the quantization value is not less than 0, calculating the quantization value of the current BU of the current frame according to the encoding information of the previous BU of the current frame and the encoding information of the previous frame, wherein the quantization value of the first BU of the current frame is the set quantization initial value of the current frame, and the quantization initial value of the current frame is related to the average value of the quantization values of the BU units of the previous frame; and coding the current BU unit according to the quantized value. By implementing the technical scheme of the invention, the image matching precision is high, and the code rate control is more accurate.