662 results about "Naked eye" patented technology

The embodiment of the invention discloses a naked eye three-dimensional interaction method and device and computer equipment. The method comprises the following steps: determining at least one three-dimensional virtual object corresponding to a target preset naked eye three-dimensional interaction scene, and determining an initial display parameter corresponding to the at least one three-dimensional virtual object; controlling the at least one three-dimensional virtual object to perform motion display in the target preset naked-eye three-dimensional interaction scene according to the initial display parameter so as to generate a naked-eye three-dimensional picture corresponding to the at least one three-dimensional virtual object; obtaining interaction feedback information generated when the user interacts with the at least one three-dimensional virtual object according to the naked eye three-dimensional picture; and according to the interaction feedback information, generating an update display parameter corresponding to the at least one three-dimensional virtual object, and based on the update display parameter, controlling the at least one three-dimensional virtual object to perform motion update display in the naked eye three-dimensional picture. Therefore, a user watches and interacts with the three-dimensional virtual object which is movably displayed in the naked-eye three-dimensional picture, the sight distance can be improved and adjusted, and asthenopia can be relieved.

The invention relates to an intelligent monitoring system for prevention and control of diseases and insect pests for bean planting, in particular to the field of intelligent monitoring of prevention and control of agricultural diseases and insect pests, and can realize extremely early precise recognition and early warning of diseases and insect pests of bean crops. The weak lesion spectral features and the continuous deterioration trend of the plant can be sensitively captured in a stage which is difficult to perceive by naked eyes, real diseases and environmental interference are effectively distinguished, the system can automatically locate a suspicious lesion area by using a weak supervised learning mechanism and only needing image-level labeling, the dependence on expensive pixel-level labeling data is greatly reduced, and the accuracy of the system is improved. Finally, a high-confidence early warning signal is output through multi-source information collaborative decision, a scientific basis is provided for accurate and green prevention and control, blind pesticide application is effectively avoided, and crop health and yield are guaranteed.

The invention relates to a naked eye 3D binocular image acquisition and real-time processing system based on hardware synchronous triggering, and belongs to the technical field of image processing and three-dimensional display. According to the system, a hardware synchronous triggering mechanism is adopted, a time sequence synchronous control unit is used for sending a synchronous pulse signal to a binocular image sensor, and strict synchronization of left and right viewpoint image acquisition is ensured. The image signal processing unit processes collected original data, the stereo parallax correction module performs epipolar correction, and the sub-pixel interleaving module generates a composite view frame according to grating parameters of the display terminal. The system realizes high-speed data transmission through a double-buffer direct memory access DMA mechanism. The problems of visual tearing and weak stereoscopic impression caused by asynchronous binocular image acquisition in the prior art are solved, nanosecond-level synchronization precision is realized, optical crosstalk is reduced, and smoothness and comfort of stereoscopic display are ensured.

The invention relates to the technical field of fire early warning, in particular to an early fire early warning system based on AI image recognition, and the system comprises an image collection module which is used for obtaining the video stream data of a monitoring area in real time; an AI image analysis module which is in communication connection with the image acquisition module and is used for receiving the video stream data and carrying out real-time analysis on video frames based on a pre-trained fire identification model so as to extract visual features related to the fire; and the early warning judgment module is in communication connection with the AI image analysis module and is used for receiving an analysis result of the visual features. According to the early fire early warning system and method based on AI image recognition, through video image analysis, the system can recognize weak flame or smoke characteristics at the initial stage of a fire and when naked eyes do not obviously see the characteristics, and the delay problem that a traditional smoke-sensing and temperature-sensing detector needs to wait for physical parameters to be diffused to the detector to be triggered is solved.

The embodiment of the invention provides an orthokeratology lens design method, an orthokeratology lens comprises an adaptive arc area, and the method comprises the following steps: S10, acquiring curvature distribution of a cornea adaptive girdle area of naked eyes of a testee, the cornea adaptive girdle area corresponding to the adaptive arc area; s20, establishing a coordinate system by taking the cornea center as an original point or a pole, and obtaining a mapping relation between the curvature of the cornea adaptive annular zone and different angles according to curvature distribution; s30, obtaining the curvature change rate of the cornea adaptive annular zone according to the mapping relation, and determining a curvature change rate threshold value; s40, determining a plurality of annular sectors according to the curvature change rate of the cornea adaptive annular zone and a curvature change rate threshold value; and S50, determining curvature distribution of an area corresponding to the annular sector in an adaptive arc area of the orthokeratology lens according to the curvature distribution of the annular sector. The fitting degree and the shaping effect of the corneal contact lens and the cornea are improved, the correction effect is improved, and the lens wearing stability can be improved.

The invention relates to the cross technical field of biomedical engineering and psychotherapy, in particular to an automatic control system for classified exposure therapy of phobia based on naked eye 3D. The system comprises an electroencephalogram signal feature extraction module, a heart rate variability feature extraction module, a skin electric response feature extraction module, an eye movement feature extraction module, a physiological load state feature extraction module, an exposure therapy process feature extraction module, a first feature fusion module, a second feature fusion module and a stimulation parameter adaptive control module. The method combines multi-mode biological signal real-time analysis and naked eye 3D stimulation parameter self-adaptive adjustment, and is suitable for clinical psychological treatment mechanisms and psychological health intervention scenes.

The invention discloses a radiotherapy laser positioning system and method, the system comprises at least three laser lamp systems, corresponding optical cameras and a computer control system, the laser lamp systems form cross cursors through two linear emitters installed in a T shape, the cross cursors are respectively arranged on the left side, the right side and the upper side of a treatment device, and a three-dimensional space positioning coordinate system is constructed. The optical camera automatically collects images of the body surface mark points of the patient and the laser cursor, and the computer control system carries out image processing, feature extraction and three-dimensional deviation calculation and feeds back deviation information to the treatment bed or the laser lamp system; and the electric control system drives the fine adjustment mechanism to perform three-degree-of-freedom accurate adjustment of translation, rotation and inclination until the mark point coincides with the cursor. According to the invention, optical automatic identification is adopted to replace manual naked eye positioning, personal errors are eliminated, rapid and automatic correction is realized, and the accuracy and efficiency of radiotherapy positioning are significantly improved.

The invention discloses a rain and sewage pipeline defect detection method and system based on distributed optical fibers. The method comprises the following steps: 1, laying sensing optical fibers in a pipeline; 2, calibrating an excitation position; 3, collecting and demodulating optical fiber vibration data; 4, performing defect identification and defect positioning on data processed by an intelligent algorithm; vibration signals are sent out through the excitation device, signal collection is carried out in combination with the distributed optical fiber sensing module, efficient recognition and accurate positioning of pipeline defects are achieved in cooperation with an intelligent detection algorithm, and hidden diseases which cannot be perceived by naked eyes can be recognized. By means of an intelligent defect recognition algorithm, signals collected by the optical fiber sensing module are deeply analyzed, the positions and the disease degrees of the defects in the pipeline can be automatically judged, dependence on manual image interpretation is avoided, and automation and intelligentization of pipeline defect detection are achieved. The system has the advantages of being high in adaptability, wide in coverage range, efficient, accurate, high in intelligent processing capacity, low in cost, high in efficiency and the like.

The invention discloses a visual effect optimization method and system based on naked eye 3D data, and belongs to the technical field of industrial visual intelligence, and the method comprises the following steps: carrying out the down-sampling of an image, screening a candidate adjustment frame, determining a global interpolation smooth adjustment strategy through a global viewpoint difference index, carrying out the detection of a local region edge dislocation index after the adjustment, and carrying out the detection of a visual effect. According to the visual effect optimization method based on the naked eye 3D data provided by the invention, global adjustment and local adjustment are combined, and wrong adjustment and incomplete adjustment are avoided; the amplitude limit ensures that the picture is free from jumping, dislocation and sudden change and is always coherent and clear; finally, the rendering quality of the dynamic image sequence can be improved, resource consumption can be reduced through computing power optimization, smooth and comfortable visual experience is provided for a user, and meanwhile high scene adaptability and long-term operation stability are achieved.

The invention provides a color stripe removing method and device and a display device.The method comprises the steps that a viewpoint mapping graph of a display panel is obtained, the viewpoint mapping graph comprises the corresponding relation between pixels and viewpoints of the display panel, and the pixels comprise multiple sub-pixels; according to the viewpoint mapping graph, determining the number and the arrangement sequence of sub-pixels corresponding to the first viewpoint in the first viewpoint period; and according to the number and the arrangement sequence of the sub-pixels corresponding to the first viewpoint in the first viewpoint period, adjusting the gray-scale values of the sub-pixels in the first viewpoint period so as to control the brightness of the sub-pixels in the first viewpoint period. By means of the method, color stripes appearing when the display device displays in a naked eye mode can be reduced or even eliminated, and therefore the naked eye display effect of the display device is improved.

The invention discloses a stereoscopic vision optimization method and system for a naked-eye 3D large screen, and particularly relates to the technical field of naked-eye 3D vision optimizing.The method comprises the steps that environment illumination and audience positions are sensed in real time through multi-sensor fusion, and an environment light field model is established; glare crosstalk noise is predicted based on physical simulation, and self-adaptive suppression and compensation are carried out in combination with human eye visual sensitivity and image content features; a virtual camera is dynamically generated according to the real-time positions of the eyes of the audience, and a lightweight neural radiation field renderer is used for real-time re-rendering, so that motion parallax is realized; and finally, intelligently fusing the glare compensation layer and the perspective correction layer, coding and outputting to a screen. The system correspondingly comprises an environment perception module, a glare compensation module, a perspective rendering module and a fusion coding module. The naked-eye 3D large-screen display method effectively inhibits ambient light interference, improves the quality and immersion of a stereoscopic picture under different visual angles, and is suitable for naked-eye 3D large-screen display under outdoor and complex illumination environments.

The invention discloses a method for a substrate management controller to acquire and record hard disk positions and electronic equipment, and relates to the technical field of servers, and the method comprises the following steps: acquiring a hard disk logic view from a disk array card by establishing an out-of-band communication session, traversing each hard disk in sequence after ensuring that all hard disk positioning lamps are turned off, a mapping relation table of a hard disk logic identifier and physical slot position information is accurately established and persistently stored through an automatic closed-loop process of lighting on, querying a hard disk backboard monitoring module, recording a physical slot position and turning off, manual plugging and naked eye recognition are replaced, and automatic discovery and recording of the physical position of the hard disk are achieved; and slot position information is directly obtained through the hard disk backboard monitoring module, so that the accuracy of the corresponding relationship between logic and physical positions is ensured.

The invention relates to a Mini-LED display submodule and a large-size naked-eye 3D display device. The Mini-LED display submodule comprises a display panel, a first grating layer and a second grating layer which are arranged in sequence. The display panel comprises a plurality of pixel units, the first grating layer comprises a plurality of first lenses, and the first lenses are used for converting emergent light rays emitted by the corresponding pixel units into collimated light rays; the focal points of the multiple first lenses are arranged in a coplanar mode, light rays passing through the first lenses can be converted into collimated light rays with unified parameters, the multiple pixel units and the multiple first lenses are arranged in a one-to-one correspondence mode, independent regulation and control of single emergent light rays can be achieved, and the problem of cross crosstalk of different emergent light rays is greatly solved in combination with collimation processing of the first lenses; by arranging the second grating layer, directional refraction can be carried out on the collimated light rays output by different first grating layers, the collimated light rays after refraction are respectively projected to different viewpoint positions in the space, and naked eye 3D display can be realized.

The invention discloses a naked-eye 3D augmented reality interactive display system, and relates to the technical field of naked-eye 3D display and reality interaction. According to the invention, the multi-source depth data acquisition module acquires and fuses a user limb depth image, the parallax physical depth mapping module completes depth and parallax mapping and visual angle correction, the occlusion relation determination module divides regions to determine the occlusion type, and the adaptive mask layer generation module generates a dynamic smooth mask layer. The shielding effect fusion display module is used for overlapping and synthesizing the shielding layer and the multi-view virtual image and then displaying the overlapped and synthesized shielding layer and the multi-view virtual image; the problems that in naked eye 3D interaction, the occlusion relation between the limbs of the user and the virtual object is not accurate, and the vision is abrupt are effectively solved, the space consistency and the vision fluency of interaction are remarkably improved, and the real and natural naked eye 3D augmented reality interaction experience is achieved.

The invention discloses an image display method for a naked-eye 3D large screen, and particularly relates to the technical field of intelligent display, which comprises the following steps of: firstly, acquiring and tracking the positions of eyes of multiple audiences in front of the screen in real time through a depth camera network, and distributing a unique ID (Identity) for each audience to realize continuous tracking; thirdly, dividing the audiences into a plurality of visual areas based on a dynamic clustering algorithm, and calculating the rendering priority of each visual area according to the number of the audiences in each visual area and the importance of the content of the concerned screen; then, left and right eye views with correct parallax are rendered in parallel for each activated visual area, and digital pre-compensation is performed by using a pre-stored optical model so as to suppress crosstalk and uneven brightness; and finally, according to the distance and angle of the visual area of the audience, querying the human factor engineering database to obtain a comfortable parallax threshold, and dynamically compressing the extreme depth of field exceeding the threshold in the scene. According to the invention, multi-audience self-adaptive high-quality 3D display is realized, and the watching experience, the resource utilization efficiency and the visual comfort are effectively improved.

The invention provides a well bottom ECD accurate determination method based on a field multi-point cycle test, and belongs to the technical field of petroleum and natural gas drilling engineering. Comprising the following steps: selecting at least three different-depth test points on a casing section, and synchronously obtaining pump pressure, drilling fluid rheological parameters and borehole-drill rod geometric data; preprocessing the data; calculating annulus pressure loss, drill rod pressure loss and drill bit pressure loss of each test point based on an API standard formula; establishing a pumping pressure-pressure consumption associated linear equation set and solving annulus and drill rod pressure consumption correction coefficients; and outputting a shaft bottom ECD for eliminating naked eye interference in combination with the real-time drilling parameters and the inversion coefficient. According to the method, the multi-point cycle test and the dynamic inversion model are combined, the deviation between the theoretical model and the actual working condition is quantified through the correction coefficient, the weighted least square and the matrix condition number pre-judgment technology are combined, the problem of ECD calculation misalignment of a traditional method is solved, and the pressure control precision and safety in a complex drilling scene are remarkably improved.

The invention discloses a multi-screen collaborative display control method and system for a portable computer supporting a spliced screen, and relates to the technical field of display control. Comprising the following steps: setting a current portable computer as main control display equipment; when it is detected that the collaborative display device enters a preset portable computer near field control range, exchanging device identification data of the master control display device and the collaborative display device in real time; the equipment identification data comprises a native display attribute, a display color brightness reference, a display coding and decoding capability matrix and a display space topology seed; performing virtual mapping on the main control display equipment and the collaborative display equipment to obtain a screen display virtual coordinate system; according to the invention, absolute continuity of lines and shapes in logic is ensured; in combination with a compensation mechanism of an edge coupling area, smooth transition processing of brightness and color is performed on adjacent edge pixels, so that a visual blank caused by a physical frame is filled, and a user cannot perceive a physical gap between screens with naked eyes.

The invention discloses a binocular vision naked eye 3D image processing method, device and system, and particularly relates to the technical field of naked eye 3D. According to the method, the foreground and background areas are defined, a parameter extraction and merit figure quantification calculation system covering parallax, scenes and splicing dimensions is constructed, and the multi-scene preset threshold and the weight factor are combined, so that comprehensive and accurate evaluation of the naked eye 3D image quality is realized, the problem of one-sided evaluation of a traditional single index is solved, and the evaluation efficiency is improved. And the core crux influencing the three-dimensional effect is accurately positioned.

The present application concerns the visual identification of materials or documents for tracking or authentication purposes. It describes methods to automatically authenticate an object by comparing some object images with reference images, the object images being characterized by the fact that visual elements used for comparison are non-disturbing for the naked eye. In some described approaches it provides the operator with visible features to locate the area to be imaged. It also proposes ways for real-time implementation enabling user friendly detection using mobile devices like smart phones.

The invention discloses a multi-angle polarization imaging method and system for micro scratches on the surface of an aluminum plate, and the method can convert the physical difference which cannot be distinguished by naked eyes and a common camera into a significant gray difference on an image through calculating a Stokes parameter and constructing a polarization feature image, thereby forming a high-contrast detection image, and improving the detection precision. The detection sensitivity and the signal-to-noise ratio are obviously improved; the method is extremely sensitive to polarization state disturbance caused by changes of the surface microstructure of the aluminum plate, interference of a uniform background can be effectively restrained, and therefore the probability of missing detection and false detection is remarkably reduced.

The utility model relates to the field of detection devices, in particular to a liquid immersion type pressure pipeline air tightness detection device, which comprises a liquid immersion box, a corrugated main pipe, a lifting frame and an air tightness immersion mounting pipe, through a separation area formed by the wave impingement plate and the blocking lines, in combination with a built-in infrared sensor, bubble dynamic states are monitored in real time, subjective errors of naked eye observation are eliminated, tiny leakage is effectively recognized, the lifting frame is driven by the air cylinder to ascend and descend, the water pressure in the liquid immersion box can be accurately adjusted, and pressure impacts of different working conditions on a pipeline can be simulated. Meanwhile, the wave impingement plate and the stabilizing plate cooperate to reduce water flow fluctuation interference, the airtight soaking mounting pipe is subjected to steering adjustment and air bag floating ball self-adaptive positioning, rapid adaptation of different pipe diameters and mounting angles is supported, the operation complexity is reduced, an airtight sleeve and a branch sleeve form a multi-layer sealing structure, and the service life is prolonged. The pressurizing box is combined to control the air pump to dynamically compensate air pressure, misjudgment or equipment damage caused by sudden pressure change in the detection process is prevented, and the overall detection effect is improved.

The utility model discloses a rubber part defect detection device based on 3D line laser, and relates to the technical field of rubber part detection, the rubber part defect detection device comprises a workbench and a detection assembly, the bottom of the workbench is provided with support column feet, and the rear side of the upper end of the workbench is provided with the detection assembly. The detection assembly comprises a limiting frame, a servo motor, a lead screw, a movable sliding block, a mounting cross rod and a laser detection piece, the servo motor is mounted at the upper end of the limiting frame, the lead screw is connected to the front end of the servo motor, the movable sliding block is connected to the exterior of the lead screw, and the mounting cross rod is mounted at the front end of the movable sliding block; and a laser detection piece is arranged at the lower end of the mounting cross rod. According to the rubber part defect detection device based on the 3D line laser, the situation that the rubber part is manually inspected with naked eyes can be avoided, meanwhile, the situation that physical and psychological health of workers is affected due to long-term work is avoided, and the overall practicability and use efficiency of the defect detection device are improved while the rubber part detection efficiency is improved through the laser detection part.

The utility model relates to nursing supplies technical field, concretely discloses a temperature -sensitive discoloration multifunctional bath brush, include: bottom plate, the both sides of bottom plate are first board surface and second board surface respectively, first board surface is provided with first bristle area and second bristle area, first bristle area sets up in first board surface center, just second bristle area is provided with a plurality of, a plurality of second bristle area sets up in first bristle area periphery, second board surface is provided with third bristle area and fourth bristle area, third bristle area sets up in second board surface center, just fourth bristle area is provided with a plurality of, a plurality of fourth bristle area sets up in third bristle area periphery, the surface of first bristle area third bristle area is equipped with temperature -sensitive discoloration layer, the utility model discloses through setting up temperature -sensitive discoloration layer on the surface of first bristle area and third bristle area, can realize real -time, directly and intuitively understand water temperature condition through observing bristle area color change only through naked eye.

The application provides a body shape trait evaluation method and system of Procypridium, and relates to the technical field of body shape evaluation; the method comprises the following steps: selecting a plurality of Procypridium that reach a preset weight, implanting PIT chips of different numbers into the bodies of the plurality of Procypridium for individual marking, and continuing to breed the Procypridium according to preset breeding conditions for a set number of days; photographing the plurality of Procypridium that reach the number of breeding days to obtain a plurality of Procypridium images; performing contour processing on the plurality of Procypridium images to obtain a plurality of body shape trait outer contours; performing difference calculation on the plurality of body shape trait outer contours through a Procrustes analysis algorithm to obtain a plurality of Procrustes distances, and converting the plurality of Procrustes distances into indexes for evaluating the body shape of the Procypridium. The body shape trait evaluation of the Procypridium is freed from subjective judgment based on naked eye observation, and scientific evaluation and accurate screening based on quantitative genetics are realized in the breeding process.

The utility model discloses a UPVC pipe bonding auxiliary device relates to pipeline installation field, including slide rail, pipeline support block and two bonding direction adjusting block, be equipped with three slider on the slide rail, slider can freely slide along the slide rail, pipeline support block corresponds with the middle slider, its top is equipped with the semicircle concave cavity that is used for supporting UPVC pipeline, and the two bonding direction adjusting block is equipped with the semicircle concave cavity that is used for supporting the UPVC pipeline. Through the design of the pipe fitting concave cavity formed by combining the cross-shaped concave cavity and the round concave cavity at the bottom, the bonding direction adjusting block can position and support the UPVC pipe fittings, the angle between the two UPVC pipe fittings in the bonding process is ensured to meet the requirements (such as 0 degree, 90 degrees and 180 degrees), the problem of deviation caused by manual naked eye judgment is thoroughly solved, the production efficiency is improved, and the production cost is reduced. And it is ensured that the bonded pipeline is installed in place at a time, reworking is avoided, waste of materials is reduced, and working efficiency is improved.

Provided is an optical film requirement that does not use fine particles for light diffusion, is entirely composed of a transparent resin, and has a self-moire pattern that cannot be visually recognized by the naked eye, said optical film requirement having high front brightness without luminance unevenness on the light emission surface of a backlight when mounted on an edge-light backlight. A light-collecting auxiliary film inserted between the light emission surface of a light guide plate and the light incidence surface of a brightness enhancement film (BEF) in an edge-light backlight unit using discrete LED point light sources, the light-collecting auxiliary film being characterized by comprising: an optical waveguide layer comprising a light-transmitting base film, and a light-collecting layer comprising a light-transmitting base film, the light-collecting auxiliary film being interposed between the light emission surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF), the light-collecting auxiliary film being interposed between the light-emitting surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF); a light extraction layer that is formed on one surface of the optical waveguide layer and has a plurality of inverted rectangular pyramid-shaped unit recesses; and a light introduction layer formed on the other surface of the optical waveguide layer and having a plurality of unit triangular prisms extending in parallel in one direction, the light extraction layer constituting a light emission surface, and prism surfaces of the plurality of unit triangular prisms constituting the light introduction layer constituting a light incidence surface. The direction of the ridge lines of the plurality of unit recesses and the direction of the ridge lines of the plurality of unit triangular prisms intersect at an angle of 42 DEG to 48 DEG, and the light extraction layer, the optical waveguide layer, and the light introduction layer do not contain fine particles for light diffusion. The self-moire pattern generated by the plurality of unit recesses and the plurality of unit triangular prism lenses cannot be visually recognized by naked eyes.

The embodiment of the invention discloses a pixel compensation method and device, a time schedule controller and a display device. Through the pixel compensation method, the difference quantity of the two adjacent frames of display data can be judged according to the gray scale difference value of the two adjacent frames of display data, when the difference quantity is small or even the two adjacent frames of display data have no difference, the compensation algorithm can be adaptively closed, brightness compensation is not relatively carried out any more, then the granular sensation of the frames is reduced, and the image quality is improved. When the difference quantity is large, it can be determined that the video picture is in a dynamic change state, at the moment, a compensation algorithm is started, and naked eyes cannot easily perceive the granular sensation of the picture in the dynamic picture. Therefore, through the pixel compensation method provided by the embodiment of the invention, at least the technical problem that a multi-domain VA visual angle compensation algorithm causes a relatively strong grainy feeling of a picture can be solved.

A system includes a printer, a light source associated with the printer and configured to emit light of a series of wavelength ranges, and a controller coupled with the light source. The controller is configured to generate a sequence of pulses corresponding to information of the printer and adjust a level of the light output of the light source based on the sequence of pulses to transmit the information of the printer while making the adjustment of the light output imperceptible to a human eye.

The invention relates to the technical field of organic synthesis, and particularly provides a thiophene-containing tetraarylethene compound as well as a preparation method and application thereof. According to the invention, two phenyl groups of tetraphenylethylene are replaced by methyl formate thiophene groups, and the substituted tetraarylethylene compound has more remarkable photochromic and mechanochromic dual functions through the interaction of a specific substituent group at the position 2 of thiophene and a large conjugated group formed by four aromatic rings; and light-operated double-color display in a polymer mechanism can be realized. The mechanochromism of the compound does not depend on ultraviolet light, when the compound is subjected to mechanical force, the molecular accumulation mode and conjugate planarity are changed, and the color change can be directly observed by naked eyes. Different from traditional tetraphenyl ethylene force-induced discoloration recessive fluorescence change, the dominant color change can be used in the fields of visual stress monitoring, anti-counterfeiting marks, inkless writing materials, safe ink and the like in ultraviolet-free environments (such as indoor and closed spaces), and the application prospect is wide.

The utility model discloses a flat plate type rail car which comprises a main body, a flat plate outer cover arranged on the surface of the main body and a rail body arranged at the bottom end of the flat plate outer cover and the main body, installation mechanisms are symmetrically arranged at the connecting position of the main body and the flat plate outer cover, and each installation mechanism is composed of a sliding block, a sliding groove and a limiting assembly. The sliding block is fixed to the bottom end of the flat plate outer cover, and the sliding groove is formed in the surface of the main body. Through the designed installation mechanism, the problems that in the using process of an original flat plate type rail car, when a flat plate outer cover and a main body need to be installed, the alignment condition of holes needs to be confirmed through naked eyes, so that subsequent thread penetrating is facilitated, and certain inconvenience exists in the mode that the positions of the holes are confirmed through the naked eyes are solved; the mounting mechanism is arranged between the flat plate outer cover and the main body, so that a plurality of holes between the flat plate outer cover and the main body are aligned in a limiting manner in the mounting process of the flat plate outer cover and the main body, and the mounting convenience is improved.