164results about How to "Reduce filter" patented technology

A face image processing method is applied to an electronic device, such that the electronic device can perform a face detection to a digital image to obtain a face image in the digital image automatically, and perform a skin color detection to the face image to exclude non-skin features such as eyes, eyeglasses, eyebrows, a moustache, a mouth and nostrils on the face image, and form a skin mask in an area range of the face image belonging to skin color, and finally perform a filtering process to the area range of the face image corresponding to the skin mask to filter high-frequency, mid-frequency and low-frequency noises of an abnormal skin color in the area range of the face image, so as to quickly remove blemishes and dark spots existed in the area range of the face image.

A face image processing method is applied to an electronic device, such that the electronic device can perform a face detection to a digital image to obtain a face image in the digital image automatically, and perform a skin color detection to the face image to exclude non-skin features such as eyes, eyeglasses, eyebrows, a moustache, a mouth and nostrils on the face image, and form a skin mask in an area range of the face image belonging to skin color, and finally perform a filtering process to the area range of the face image corresponding to the skin mask to filter high-frequency, mid-frequency and low-frequency noises of an abnormal skin color in the area range of the face image, so as to quickly remove blemishes and dark spots existed in the area range of the face image.

The invention belongs to the technical field of printing and in particular relates to a structural color material for photosensitive three-dimensional printing and a preparation method thereof. The structural color material is prepared from the following components: 5 to 15 parts of monodisperse nanoparticle, 15 to 35 parts of hyperbranched polyurethane acrylic resin, 40 to 50 parts of an active diluting agent, 0 to 10 parts of an alcohol solvent, 2 to 5 parts of a photoinitiator, 2 to 10 parts of an auxiliary agent. According to the structural color material provided by the invention, the monodisperse nanoparticles are used as a basic unit for assembling structural color to form a color generation part of a photosensitive three-dimensional printing material; the structural color materialis environmentally friendly and has a bright color, and a condition that a spraying nozzle is blocked can be avoided; meanwhile, the hyperbranched polyurethane acrylic resin with good compatibility and photoreaction properties is utilized so that the problems that a current 3D printing photo-curing speed is not rapid enough, the compatibility between the materials is poor and the shrinkage rate isrelatively large in a curing process are improved. By adopting the structural color material for the photosensitive three-dimensional printing, provided by the invention, produced colored componentswith high precision, environment protection and low cost can be widely applied to fields including decorations, anti-counterfeiting labels and the like and have a wide market prospect.

A piezoelectric thin-film resonator includes a substrate, a lower electrode provided on the substrate, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the piezoelectric film so as to have a portion that overlaps the lower electrode across the piezoelectric film. At least a part of an outer end of the piezoelectric film is further in than an outer end of an opposing region in which the upper and lower electrodes overlap each other across the piezoelectric film.

A method for detecting a biomolecule by using a Fe3O4@Au nucleocapsid nano-probe relates to a surface-enhanced raman spectroscopy and includes the steps of first preparing a Fe3O4@Au probe; then preparing a gold probe; and finally raman-detecting. The method has the advantages of being capable of extracting, washing and concentrating a target biomolecule from a complex biological sample matrix conveniently by using an applied magnetic field, omitting multifarious operation such as centrifugation, filtering and the like, greatly improving detecting efficiency of the biomolecule, having good chemical stability and biological compatibility, and being capable of being used in detecting of the biomolecule safely. The probe combines the surface-enhanced raman spectroscopy, a detecting system has strong surface-enhanced raman signals, fast high-sensitivity detecting on the biomolecule is achieved by detecting enhanced raman signals of a marked molecule, and detecting sensitivity in an experiment is 10-7M. Compared with a traditional biological method, the method is simple and fast to operate, good in reproductively, and capable of achieving detecting of clinical samples.

The invention relates to a preparation method for PTFE, and particularly relates to a preparation method for a multifunctional PTFE composite film. The preparation method mainly solves the technical problems that a polytetrafluoroethylene film prepared by a conventional technology can not filter small particles and has poor resistance to water permeability and poor strength. The preparation method comprises the steps of preparing a blank by mixing materials; base-band shaping; stretching to form a film; then conveying the surface of the prepared PTFE biaxial stretching microporous film to an expansion roller; coating a fluorine resin suspended emulsion on the surface of the PTFE biaxial stretching microporous film by a spraying device; sending the surface of the PTFE biaxial stretching microporous film to an infrared or hot wind heating device by a roller cloth clamper to carry out drying and high temperature rapid calcinations, so as to make the fluorine resin coated on the surface melt; and finally winding into the film by a winding roller to obtain the multifunctional PTFE composite film.

The invention discloses a filter unit capable of lowering the air flow temperature and supplementing beneficial components. The filter unit is a cylinder of multiple channels formed by folding and gathering composite sheets through embossing along embossing lines, and the composite sheets are formed by bonding a polymer film and cellulose paper. The filter unit can effectively lower the air flow temperature, the aerosol temperature of an oral cavity reaches 100 DEG C or lower, the temperature reaches 70 DEG C or below generally, aroma components and the nicotine content can be increased, satisfaction is improved, the functions are achieved at the same time, and then the structure of an aerosol generation materials is simplified; aerosol filtering is effectively lowered, and a consumer canbetter satisfy the smog amount. Particularly, the quality needed by aerosol generation materials is heated and not combusted. According to the composite sheets, the physical hardness needed by the filter unit and the functional requirement are improved, and the usability, applicability and functionality of the filter unit are effectively enhanced.

The invention discloses a preparation method of high-purity algal polyphenol. The preparation method comprises the process steps of separation of algal polysaccharide and alga residues, enzymolysis wall breaking of the alga residues, efficient extraction of algal polyphenol, separation and purification of the algal polyphenol, and obtaining of the high-purity algal polyphenol. According to the preparation method, full-alga comprehensive utilization of the algal polysaccharide, the algal polyphenol and the alga residues is realized.

The invention discloses a rainwater collecting and retreating device. The device comprises a rainwater collecting device, a settling device, a connecting device, a first filtering device, a motor device, a second filtering device and a discharge device, wherein the rainwater collecting device comprises a rainwater collecting frame, first supporting rods, a first pipeline and a first valve, the settling device comprises a first frame body, a first filter screen, first springs, a first support, a first sponge block and a second spring, the connecting device comprises a second pipeline, a second valve, a second support, a third support and a first slant rod, the first filtering device comprises a second frame body, a sealing ring, a second filter screen, a second support rod, a third support rod and a third pipeline, the motor device comprises a motor, a rotating shaft, first stirring rods, second stirring rods, first bristles, a locating shaft, a fourth support, a first cross bar and a fifth support, and the second filtering device comprises a third frame body, a roller, second bristles, a sixth support, a fourth pipeline and a third valve. The rainwater collecting and retreating device disclosed by the invention can effectively collect rainwater, and precipitates and filters rainwater.

The invention discloses an inverter for two-phase orthogonal electromagnetic blender, adopting a six-leg structure and an orthogonal vector control method to complete the decoupling control for the current and frequency of the two-phase electromagnetic blender so as to make the phase difference of two-phase low-frequency output currents be 90 deg., the third phase is connected with the midpoint of the two-phase electromagnetic blender, and the AC of the third phase is radical sign 2 times as great as those of the other two phases. The method adopts a current- frequency double closed-loop control. The current sensor collects two-phase current signals and PI regulation sections control the frequency of the output pulse by orthogonal transform, PWM drive, etc., thus controlling the amplitudes and frequencies of the two-phase orthogonal low-frequency voltages that are outputted by the inverter, and thus the invention implement the vector control of the magnetic force of blending of the electromagnetic blender. The invention improves the reliability of the electromagnetic blending system and reduces reactive compensating equipment and filtering equipment, saving the space and reducing the cost of the electromagnetic blender.

The invention discloses a low-cost foam ceramic filter for cast steel and high temperature alloy. The foam ceramic filter adopts zirconia, alumina and zirconium silicate powder as the main raw materials, is added with a small amount of a sintering aid and a binder, and foam cutting, slurry hanging, drying and sintering are carried out so as to generate the zirconia-corundum-mullite composite foam ceramic filter. The raw materials involved in the invention are low in cost, the product sintering temperature range is wide, the sintering process is easy to control, and the sintered zirconia-corundum-mullite composite foam ceramic filter has the characteristics of good thermal shock resistance, high mechanical strength, strong resistance to slag corrosion, and high load softening point, can tolerate impact of high temperature molten steel above 1650DEG C, and can be used for filtering cast steel and high temperature alloy liquid.

The present invention discloses a weather radar echo image processing method. The method comprises the steps of carrying out the storm tracking detection on a weather radar echo image, and determining the storm clusters contained in the weather radar echo image; determining the initial area of each storm cluster; determining and deleting the echo data points of which the echo intensity is less than a first intensity threshold value in the storm clusters, wherein the first intensity threshold value is less than a conventional rainfall echo intensity lower bound; carrying out the continuity detection on the current echo data points contained by the storm clusters, and determining and deleting the clutter data points in the storm clusters; calculating the ratios of the current areas and the initial areas of the storm clusters respectively, and deleting the storm clusters of which the ratios are less than a second threshold value. Based on the method disclosed by the present invention, the clutter of higher intensity can be filtered effectively, and the rainfall echo of lower intensity can be retained, thereby being able to reduce the possible deviation during a subsequent weather prediction process. The present invention also discloses a weather radar echo image processing device.

The invention relates to a polytetrafluoroethylene punched felt. From the outside to the inside, the structure of the punched felt comprises a polytetrafluoroethylene crimped staple layer, a polytetrafluoroethylene filament base fabric and a polytetrafluoroethylene crimped staple layer, wherein the thickness of the punched felt ranges from 0.8 to 1.8 millimeters; polytetrafluoroethylene crimped staples mutually hooked and crossed are inserted in the base fabric from upside and downside and tightly connected with the base fabric. The punched felt produced by the invention has the advantages of stable chemical properties, high filtering effect, high strength, low heating shrinkage, low material consumption, low cost, no smoke pollution and the like.

The invention relates to a nano light screen zinc cerium composite oxide and its preparing method, adopting water soluble salts of zinc and cerium, dissolving them in water in proportion, adding in fuel such as urea to form a uniform mixed solution; making primary hot air atomization by hot air and obtaining several micrometer-sized gel particles; firing in an electric cooker or microwave oven and obtaining loose zinc cerium composite oxide powder; mixing the powder with methyl acrylate monomers and initiator to form a suspended solution, then making secondary air atomization, and obtaining the nano zinc cerium composite powder with transparent coating. The polymers coated on the oxide particles have excellent chemical stability; the powder has high UV absorption ratio in the 190-400 nano wave band, and the visible lights can transmit the powder, and the powder has very low oxidation catalysis and can resist acid corrosion and is buff in appearance.

The invention discloses a method for manufacturing laminating filter cloth through wet process. A laminated membrane layer of the laminating filter cloth is obtained through a method of coagulating a coating through the wet process. The technical scheme is that first calendaring processing is performed on a lamination face of the filter cloth needing laminating processing, then a coating agent which is high in porosity, smooth in surface and good in elasticity and abrasion resistance and is made of an organic high polymer material is coated or soaked on the surface of the filter cloth subjected to calendaring processing through the coating or a soaking device, the filter cloth coated with the coating agent is soaked into coagulating bath and stays in the coagulating bath at certain temperature for a while to ensure that a membrane is well formed on the surface of the filter cloth through the coating agent, and the temperature of the coagulating bath and the staying time are controlled and adjusted to obtained the required porosity and membrane layer thickness. Then washing and drying are performed, and the technological process for manufacturing the laminating filter cloth through the wet process is finished. According to obtained laminating filter cloth, deep filtering is changed into surface filtering, so that filtered materials cannot be clustered in holes among yarns of the filter cloth and are smoothly separated from the filter cloth along with the cake removing process of a filter cake, the materials are prevented from being blocked in the holes among the yarns and fibers of the filter cloth and holes in the fibers of the filter cloth, and the possibilities that the filtered materials block the filter cloth are greatly reduced. The method is an important approach and effective way for improving filtering efficiency, reducing energy consumption of a filtering system, reducing blockage of the filter cloth, greatly increasing service life of the filter cloth, and greatly reducing production cost. The method can be applied to solid-liquid separation, filtering, dehydration, material purification and recovery operation in industries of mines, metallurgy, chemical engineering, light industries, foods and the like.

The invention discloses a process for preparing nuclear-grade hafnium oxide and zirconium oxide through solvent extractive separation of zirconium and hafnium. The process comprises the following steps: (1) mixing tributyl phosphate or tributyl phosphate and ionic liquid, which serve as extractants, and kerosene, which serves as a diluent, so as to prepare an organic phase; and then, mixing the organic phase with nitric acid, and carrying out countercurrent acidification in a centrifugal extractor; (2) adding zirconium oxychloride, which serves as a raw material, into deionized water, carryingout dissolving, and then, adding hydrochloric acid and nitric acid into the solution, so as to prepare a feed solution containing zirconium and hafnium; (3) carrying out countercurrent extraction onthe acidified organic phase and the feed solution containing zirconium and hafnium, prepared in the step (2), in a centrifugal extractor; (4) carrying out back-extraction on a zirconium-containing organic phase with water, then, carrying out hydrolysis, and carrying out calcination, so as to obtain nuclear-grade zirconium oxide; and (5) enriching hafnium-containing raffinate with P204, then, carrying out back-extraction, carrying out hydrolysis, and carrying out calcination, so as to obtain nuclear-grade hafnium oxide. According to the process, the problems, i.e., complicated process, much waste liquid and environmental pollution in the prior art are solved, and the production efficiency is increased.

The invention discloses an adhesion substrate for artificial cultivation of porphyra yezoensis conchocelis. The adhesion substrate comprises a cement base, oyster shells, and auxiliary handles; the cement base main body is made of cement; the oyster shells are closely connected and distributed on the adhesion substrate; a surface with a pearl layer of each oyster shell faces upwards; the rough surface of each shell is embedded into the cement base; the auxiliary handle is embedded into the cement base; and two ends of the cement base are respectively provided with one auxiliary handle, and themain function is to assist the movement and distribution of the adhesion substrate. A mode of integration and fixing of the shells is adopted in the application, the size and specification limitationof raw materials of adhesion substrates is broken through, and the utilization rate of the shells is improved. The adhesion substrate with the cement base can be cleaned with the match of high-pressure water-flow washing, meanwhile, displacement of the adhesion substrate is avoided, and the cleaning efficiency is improved, so that the labor cost is reduced. The utilization area of a single adhesion substrate is effectively increased; and compared with the area of conventional adhesion substrates, the area is increased by 15-30 times, so that the breeding efficiency is remarkably improved, andthe production management cost is reduced.

The invention relates to a method for precipitating crystal heavy-rare-earth carbonate, wherein pH of heavy-rare-earth chlorid solution is adjusted to 5.0 to 5.2 by the 8-10% carbon-ammonia water, adding polyacrylamide saturated-water solution in which the volume is 1-3 per thousand of that of heavy-rare-earth chlorid solution, filtering, and the filtrate is diluted to 0.4 to 0.5 M by water, adding eavy-rare-earth carbonate, as seed crystal, agitating to uniformly mix, then precipitating by 8-10% carbon-ammonia water, ending precipitating when pH is 6.2, adding water to 80-90% of volume of the precipitating container, stopping the press water for 12- 24 hours, washing the precipitate for 2 -3 times, filtrating, and crystal heavy-rare-earth carbonate is obtained. The invention has simple operation, low cost, high yield of heavy-rare-earth and good-quality product which contains low-water and low calcium carbonate, chloride ion or the like, is easy to filtrate, having convenient packaging, stacking and trasportation, and small contamination.

The invention relates to a fresh air system, in particular to a highly-efficient, energy-saving and environmentally-friendly combined fresh air system, which belongs to the field of ventilation equipment. The combined fresh air system mainly comprises blowers, a heat exchanger, heat-preservation shells and pipelines, wherein the number of the blowers is at least two, and the number of the heat-preservation shells is also at least two; the heat exchanger is arranged in one heat-preservation shell, and openings are reserved on the same heat-preservation shell; the blowers are connected with the heat exchanger through the pipelines; the blowers suck outdoor air in and discharge indoor air through the pipelines, and the outdoor air and the indoor air simultaneously flow through the heat exchanger and perform heat exchange to realize heat recovery; and the blowers and the heat exchanger are arranged in different heat-preservation shells and are connected through the pipelines so as to realize the distribution of the volume of the system into a relatively larger space and make the fresh air system adapted to the mounting conditions of different buildings or residential structures.

The invention discloses a method for preparing an aluminum tobermorite adsorbing material by using fire coal ash wastes. The method comprises the following steps: calcining fire coal ash in an electric heating furnace, cooling to room temperature and grinding to obtain fine ash powder; subsequently leaching the fine ash powder by using diluted hydrochloric acid and then filtering, washing and drying to obtain a precursor ash powder body; grinding and mixing the ash powder body and Ca(OH)2, then adding NaOH into the mixture and grinding and mixing to be uniform to obtain a mixture; spraying a water glass solution to the mixture and rotationally rolling to form a spherical granular aluminum tobermorite reactant precursor; putting the aluminum tobermorite reactant precursor into a stainless steel wire cage drawer of a reaction kettle, performing a hydrothermal water-proof stilling reaction for 16-20 hours at the temperature of 170-190 DEG C; cooling and releasing the pressure after the reaction ends, and then separating out reaction products and drying to obtain the aluminum tobermorite adsorbing material. The material prepared by the method disclosed by the invention has good adsorption and decontamination effects and achieves the aim of preparing an environmental material with a relatively high additional value by using the fire coal ash.

The invention relates to a preparation method for a fructo-oligo saccharide feed additive. The preparation method comprises the following steps of (1) preparing a saccharose solution to prepare reaction liquid; (2) inoculating aspergillus niger strain liquid into the reaction liquid for fermentation cultivation, then adding wine-making yeast for continuous fermentation, and performing sterilization to prepare fructo-oligo saccharide feed additive liquid; and (3) performing drying and smashing on the fructo-oligo saccharide feed adding liquid to obtain the fructo-oligo saccharide feed additive. According to the preparation method, aspergillus niger strains with high fructosyl transferase activity are selected from soil for direct fermentation to produce fructo-oligo saccharide; the activity of fructosyl transferase produced by the strains is improved by over 15-20 percent when compared with the activity of enzyme produced by the conventional aspergillus niger; meanwhile, due to yeast fermentation, the content of the fructo-oligo saccharide in the final product is improved by over 20 percent.

The invention discloses a fresh bamboo juice extraction method which comprises the steps of: a, selecting and preparing materials, namely selecting fresh bamboo poles of flicker powder bamboos and clean bamboos which belong to annual to biennial graminaceous plants as raw materials, cleaning, then sawing the raw materials into short sections, and crushing the short sections with a hammer; and b, extracting fresh bamboo juice, namely putting the bamboo poles treated in the step a into an extraction container according to angles of more than 0 degree and less than or equal to 90 degrees, sealing the extraction container with a cover, feeding steam into the extraction container, heating the fresh bamboo poles, controlling the temperature of the steam at 105-115 DEG C, opening a liquid outlet pipe valve at the bottom of the extraction container, abandoning water leached from the bamboo poles at first, then collecting the water leached from the bamboo poles with a container when the leached liquid is light green, the liquid temperature is 60-70 DEG C and bamboo fragrance spills out, stopping collection after heating for 1.5-2 hours, and thus obtaining a fresh bamboo juice raw liquid finished product. The fresh bamboo juice extracted by the method is rich in fragrance; the influence caused by continuous high temperature in a process of feeding the steam to the fresh bamboo juice can be effectively avoided; and therefore, the quality of the fresh bamboo juice finished product is improved.

The invention discloses a composite microbial deodorizer, comprising, by weight, 25-35 parts of a composite bacterial liquid, 20-30 parts of molasses, 0.1-0.5 part of composite vitamin liquid, 0.3-1 part of trace elements, and 40-50 parts of water. The composite bacterial liquid comprises, by weight, 12-15 parts of Rhodopseudomonas palustris, 10-13 parts of Bacillus subtilis, 10-13 parts of Bacillus licheniformis, 7-10 parts of Lactobacillus, 10-14 parts of composite photosynthetic bacteria, 6-8 parts of Saccharomyces cerevisiae, 5-8 parts of nitrobacteria, 6-10 parts of nitrite bacteria, and5-10 parts of thiobacillus; a culture medium comprises, by weight, 0.2-0.4 part of maltose, 0.8-1.2 parts of beef extract, 0.08-0.12 part of zinc sulfate, and 93-96 parts of water. The total effectivebacterial count is greater than 0.35 billion per milliliter, the Saccharomyces count is greater than 10 million per milliliter, the bacillus count is greater than 60 million per milliliter, and the Monoucleosis account is greater than 30 million per milliliter. The composite microbial deodorizer has high deodorizing efficiency, little negative effect and high economic benefit.

The invention discloses a method for preparing small crystal grain Beta zeolite, which is characterized in that the precursor gel containing a Beta zeolite secondary structure unit serves as synthetic raw material and is added into mixed solution containing alcohol and surface active agent, and is hydrothermally crystallized. The method can overcome the defects of high water consumption and low zeolite yield of the traditional small crystal grain zeolite synthesis technology, prevent the use of raw material containing sodion in a synthesis system, so as to reduce ammonium exchange and filtration, baking and a series of processes afterwards, and improving the zeolite yield. Compared with the Beta zeolite which is prepared hydrothermally in water phase with the same synthetic raw material, the zeolite prepared through the method displays higher catalytic activity in small molecule alkane cracking reaction.

The invention relates to a method for synthesizing a titanium silicalite molecular sieve, which comprises the following steps: mixing, stirring and hydrolyzing a titanium-containing compound, a TPAOH aqueous solution and a silicon raw material, and putting the obtained mixture into a high-pressure reaction kettle to heat for reacting; and mixing an obtained reaction mixture with solid silica gel, drying the obtained object so as to obtain a solid mixture, carrying out heating reaction on the solid mixture in an airtight reaction kettle, after the solid mixture is cooled, taking out and then roasting the solid mixture so as to remove organic matters, so that a TS-1 molecular sieve is obtained. In the technical scheme above, by reducing the application amount of a guiding agent tetrapropylammonium hydroxide (TPAOH), taking inorganic silicon oxide for replacing organosilicone as a raw material, and taking a solid-phase solvent-free crystallization method, the steps of filtering, washing and the like are omitted, thereby simplifying the synthesis operation of the TS-1 molecular sieve and reducing the synthetic cost.

An optical amplifier comprises a doped fiber core and a cladding layer surrounding the core. The mode field diameter of the fiber is greater than 8 μm and the refractive index difference between the core and the cladding layer is selected such that the cut-off wavelength at which the fiber becomes single mode lies in the range 1000-1550 nm. This amplifier uses a large made field diameter fiber, which reduces the intensity for a specified output power. This results in reduced filtering of the low frequency components of the signal. The refractive index difference between the core and cladding is selected such that the fiber is multi-mode at 980 nm, which enables bend performance to be improved.

The invention belongs to the technical field of plant growth regulators, and discloses a preparation method of IL, a magnetic graphene oxide nano-material and an application of the magnetic graphene oxide nano-material. A synthesized magnetic material is used as an adsorbent in an established magnetic solid phase extraction technology and dispersed in a sample solution, fully adsorbs a target substance and can reach adsorption equilibrium with seven plant growth regulators in a short time, only 5 min is taken in the adsorption process, and a small quantity of organic solvent is used; the adsorbent is separated from the sample solution by an external magnetic field. Compared with traditional solid phase extraction and dispersive solid phase extraction, operations such as column filling, centrifugation, filtration and the like can be omitted. The seven plant growth regulators are analyzed qualitatively and quantitatively based on magnetic solid phase extraction-ultrahigh performance liquid chromatography-tandem mass spectrometry of the synthetic material, and characteristics of high specificity, high sensitivity and good precision are achieved.

A resonator includes a silicon substrate, a bottom electrode stacked on a portion of the silicon substrate, a piezoelectric layer covering the bottom electrode and another portion of the silicon substrate, a top electrode stacked on the piezoelectric layer, and a Bragg reflecting ring. The Bragg reflecting ring is formed on a side of the piezoelectric layer connected to the top electrode and surrounds the top electrode. The Bragg reflecting ring includes a Bragg high-resistivity layer and a Bragg low-resistivity layer alternately arranged along the radial direction of the Bragg reflecting ring. An acoustic impedance of the Bragg high-resistivity layer is greater than an acoustic impedance of the Bragg low-resistivity layer. The Bragg reflecting ring forms reflection surfaces to reflect the laterally propagating clutter waves, thereby suppressing the parasitic mode in the working frequency band, improving the frequency response curve of the resonator and the overall performance of the resonator.

The invention discloses a terahertz image recognition method and system based on deep learning, and belongs to the technical field of terahertz image recognition, and the method comprises the following steps: S1, designing and training a convolutional neural network; s2, detecting dangerous target information in the terahertz original image; s3, performing structured processing on the target information; and S4, displaying the image information. In the step S1, a weight file of the convolutional neural network is loaded into detection equipment before a dangerous target existing in the terahertz original image is detected. According to the method and system, an automatic and efficient detection process is realized, the security check speed and precision are effectively improved, the manualimage judgment time can be greatly reduced, and the number of workers can be reduced; a large amount of information can be effectively filtered, effective information is reserved, redundant alarm information is eliminated, a complete and concise detection result is displayed, and the workload of workers is effectively reduced.