31 results about "Relative luminance" patented technology

The invention relates to a method for adjusting the luminance of at least two subpixel units (S1, Sn, S1', Sn'), wherein each subpixel unit (S1, Sn, S1', Sn') comprises at least one subpixel (R, G, B, R1, G1, B1, R2, G2, B2) of a pixel (P) of an active matrix organic light-emitting diode (AMOLED) display. The AMOLED display comprises public mode subpixel units (S1, Sn) configured for display in a public mode and privacy mode subpixel units (S1', Sn') configured for display in a privacy mode. For each subpixel unit (S1, Sn, S1', Sn'), a relative luminance loss (ΔL) is determined with respect to an initial luminance of the respective subpixel unit (S1, Sn, S1', Sn'). The most degraded subpixel unit (S1, Sn, S1', Sn') is determined as the subpixel unit (S1, Sn, S1', Sn') with the highest relative luminance loss (ΔL).If the relative luminance loss (ΔL) of the most degraded subpixel unit (S1, Sn, S1', Sn') exceeds a loss limit (G, G'), a dimming factor less than or equal to 100 percent is determined for each subpixel unit (S1, Sn, S1', Sn') such that the normalized luminance (LN) of the respective subpixel unit (S1, Sn, S1', Sn') multiplied by the dimming factor is equal to the normalized luminance (LN) of the most degraded subpixel unit (S1, Sn, S1', Sn'), but at least equal to a predetermined normalized luminance limit (LNG, LNG1, LNG2). Each subpixel unit (S1, Sn, St, Sn') is driven with a gray value and / or drive current adapted according to the respective dimming factor. If the relative luminance loss (∆L) of the most degraded subpixel unit (S1, Sn, S1', Sn') does not exceed the loss limit (G, G'), no subpixel unit (S1, Sn, S1', Sn') is adjusted with a dimming factor.

The utility model relates to a machine vision and industrial detection technology, in particular to a rapid focusing industrial lens structure, an industrial lens, a control system and an industrial vision detection device, wherein the rapid focusing industrial lens structure adopts an electrowetting liquid lens to realize millisecond-level automatic focusing. A fast focusing industrial lens structure is composed of eight glass lenses and an electric control liquid lens, and the nominal value of the optical focal length is 35 mm. Within the object distance range of 225-600mm, the liquid lens realizes millisecond-level automatic focusing by adjusting the curvature of a liquid interface, and the optical back focal length and the mechanical back focal length are kept unchanged. Through actual measurement, the absolute value of lens distortion is less than or equal to 2%, the curvature of field is less than or equal to + / -0.2 mm, the full-field relative illumination is greater than or equal to 95%, and the high-resolution imaging requirements of industrial vision, automatic detection and robot precise positioning scenes can be met.

The embodiment of the application discloses a high-definition zoom lens applied to micro-nano high-precision 3D printing, comprising: coaxially arranged lens groups with positive light angles, a diaphragm, a light splitting device, a galvanometer, a protective glass and an imaging surface, wherein the lens groups comprise coaxially arranged first group lenses and second group lenses in sequence, and the diaphragm is located between the first group lenses and the second group lenses. Through the high-definition zoom lens, the printing pixel size can be continuously changed, the lens distortion is small, the relative luminance is high, the light efficiency is high, and the use requirements are met.

The application provides an optical lens and an electronic device. The optical lens comprises: a first lens, the first lens having negative optical power, a first side of the first lens being a convex surface, and a second side of the first lens being a concave surface; a second lens, the second lens having positive optical power, a first side of the second lens being a convex surface, and a second side of the second lens being a convex surface; a third lens, the third lens having negative optical power, a second side of the third lens being a concave surface; a fourth lens, the fourth lens having positive optical power, a first side of the fourth lens being a convex surface, and a second side of the fourth lens being a convex surface; a fifth lens, the fifth lens having positive optical power, a first side of the fifth lens being a convex surface; and a sixth lens, the sixth lens having positive optical power, a first side of the sixth lens being a convex surface. The application solves at least one of the problems of low relative luminance, poor resolving power, strong ghost image and small angular resolution in the prior art.

The application discloses an optical lens, which comprises seven lenses and a liquid lens, and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive optical power, the object side and the image side of which are both convex surfaces; a fourth lens with positive optical power, the object side and the image side of which are both convex surfaces; a liquid lens with optical power, which presents different focal lengths according to different applied voltages; a fifth lens with positive optical power, the object side and the image side of which are both convex surfaces; a sixth lens with negative optical power, the object side of which is a concave surface and the image side of which is a convex surface; and a seventh lens with positive optical power, the object side of which is a concave surface and the image side of which is a convex surface. The optical lens provided by the application has the advantages of small total length, high relative luminance, high resolving power and the like.

The invention discloses a light source setting method of an AI camera in an animal experiment system, the animal experiment system comprises an experiment box body and an animal observation box arranged in the experiment box body, and the periphery of the animal observation box is of a transparent plate structure; a plane mirror is obliquely arranged around at least one side of the animal observation box, and a camera is arranged above the experiment box body corresponding to the plane mirror; the method comprises the following steps: arranging a light source above an experimental box body, wherein the light source emits vertical light to illuminate the area of an animal observation box; anti-dazzling screens are arranged at the upper ends of the transparent plate structures on the periphery of the animal observation box, and the anti-dazzling screens prevent vertical light from directly irradiating the inner and outer side surfaces of the transparent plate structures; imaging of the vertical optics in the animal observation box in the horizontal direction enters the camera from the plane mirror to be shot and collected. The relative brightness of the impurities is reduced through the anti-dazzling screen, so that the impurities are not obvious in imaging, and the accuracy of animal behavior analysis is facilitated.

The invention discloses an in-cabin looking-around confocal lens and a camera device and a driving tool with the same, the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side, and the following conditions are met: 13.14 lt; fOV / Ym / 2lt; 24.36, FOV is the angle of view of the lens, and Ym is the image height of the lens corresponding to the FOV. According to the invention, large-view-field coverage is realized, and the consistency of visible light and infrared imaging is considered at the same time; it is ensured that the lens can shoot high-definition pictures at the high temperature of + 125 DEG C and the low temperature of-40 DEG C; the imaging resolution is high, the MTF level is kept excellent in a full-view-field range, and center and edge imaging is balanced; the aberration correction capability is outstanding, the chromatic aberration control is excellent, the chromatic aberration is stably controlled within 2pixel, and the purple edge inhibition effect is remarkable; and when the field angle is 80 degrees, the relative illumination is higher than 50%, and the image brightness distribution is uniform.

The present application relates to a kind of wide-angle large light vehicle lens, it is related to visual lens technical field.The lens is composed of six lenses, from object side to image side along optical axis in order: the first lens with negative refractive power, the second lens with negative refractive power, the third lens with positive refractive power, the fourth lens with positive refractive power, the fifth lens with negative refractive power and the sixth lens with positive refractive power, adopt glass-plastic hybrid structure, through the combination of four plastic aspheric lenses and two spherical lenses, the wide-angle design of focal length 3mm is realized.The lens has F1.5 Large light quantity, and the relative luminance of full field of view is greater than 50%, and the optical total length is less than 22mm, and the structure is light and compact.System realizes athermal design by reasonable allocation of optical power, ensure clear imaging in-40 ℃ to +105 ℃ Environment, can be adapted to five million pixel sensor.The present application has large field of view (up to 143 °), high resolving power and strong chromatic aberration suppression.

The invention relates to a method for adapting the luminance of at least two sub-pixel units (S1, Sn, S1', Sn'), wherein each sub-pixel unit (S1, Sn, S1', Sn') comprises at least one sub-pixel (R, G, B, R1, G1, B1, R2, G2, B2) of a pixel (P) of an active matrix organic light emitting diode (AMOLED) display. The AMOLED display comprises public mode sub-pixel units (S1, Sn) which are configured for a display function in a public display mode and privacy mode sub-pixel units (S1', Sn') which are configured for a display function in a privacy display mode. For each sub-pixel unit (S1, Sn, S1', Sn'), the relative luminance loss (∆L) with respect to the initial luminance of the respective sub-pixel unit (S1, Sn, S1', Sn') is determined. The most degraded sub-pixel unit (S1, Sn, S1', Sn') is determined as the sub-pixel unit (S1, Sn, S1', Sn') with the highest relative luminance loss (∆L). If the relative luminance loss (∆L) of the most degraded sub-pixel unit (S1, Sn, S1', Sn') exceeds a loss limit value (G, G'), a dimming factor of less than or equal to 100 percent is determined for each sub-pixel unit (S1, Sn, S1', Sn') in such a manner that the normalized luminance (LN) of the respective sub-pixel unit (S1, Sn, S1', Sn') multiplied by the dimming factor is equal to the normalized luminance (LN) of the most degraded sub-pixel unit (S1, Sn, S1', Sn') but at least equal to a specified normalized luminance limit value (LNG, LNG1, LNG2). Each sub-pixel unit (S1, Sn, S1', Sn') is controlled by means of a grey value and / or control current which is adapted according to the respective dimming factor.

This application discloses a method, apparatus, and storage medium for compensating for localized banded defects in a display screen, used to improve the detection efficiency of banded defects in the display screen. The method involves sequentially acquiring corresponding grayscale images to generate a set of grayscale images; generating a set of relative brightness images based on the set of grayscale images; generating a relative grayscale matrix for the relative brightness image of each grayscale to be repaired based on the relative brightness image set; determining the banded defect region in the grayscale images based on the relative grayscale matrix; forming a set of associated bands; generating an initial band level for each band based on the associated band set; calculating the defect adjustment level for each band; calculating the banded defect adjustment value based on the initial band level, the defect adjustment level, and the minimum compensation unit; superimposing the banded defect adjustment value onto a preset initial compensation value in the grayscale images; and using the target compensation value for banded defect compensation processing.

The utility model relates to projection display technical field discloses a kind of light waveguide and head-up display system, light waveguide includes: light waveguide body;Coupling-out grating, located the surface of the light waveguide body;Coupling-in grating, located the surface of the light waveguide body, and the coupling-in grating is located the central position of the light waveguide body;Light uniformizing device, located the one side of the light waveguide body away from the coupling-in grating, and it is opposite to be arranged with the coupling-in grating, and the light uniformizing device is used for balancing the relative brightness of straight penetration light that is emitted by the coupling-in grating and the diffracted coupling-out light that is emitted by the coupling-out grating.The utility model is by setting light uniformizing device in the center of light waveguide body, the straight penetration light that is emitted by coupling-in grating is carried out light uniformizing processing, not only can improve the display efficiency of AR-HUD, and can homogenize the image brightness of central coupling-in waveguide output.

The utility model relates to an optical adapter and an endoscope. The optical adapter sequentially comprises a first cemented lens group with positive focal power from an object side to an image side along an optical axis, the first cemented lens group comprises a first lens and a second lens which are cemented and are sequentially arranged from the object side to the image side along the optical axis, and the object side surface of the first lens is a convex surface; the second cemented lens group has positive focal power, the second cemented lens group comprises a third lens and a fourth lens which are cemented and are sequentially arranged from the object side to the image side along the optical axis, and the image side surface of the fourth lens is a convex surface; and the fifth lens has negative focal power, and the image side surface of the fifth lens is a convex surface. The optical adapter is favorable for correcting various aberrations such as chromatic aberration and distortion, improving the relative illumination of imaging and improving the imaging resolution, thereby being favorable for improving the imaging quality of the optical adapter.

An optical system, a camera module and an electronic device, the optical system comprising, in order from an object side to an image side along an optical axis, a first lens to a seventh lens having refractive power, and the first lens and the fifth lens having negative refractive power, and the second lens, the third lens, the fourth lens and the sixth lens having positive refractive power, wherein the object side surface and the image side surface of the first lens, the object side surface and the image side surface of the fifth lens, the image side surface of the sixth lens and the object side surface of the seventh lens are all concave at a near optical axis, and the object side surface and the image side surface of the second lens, the object side surface and the image side surface of the third lens, the object side surface and the image side surface of the fourth lens, the object side surface of the sixth lens and the image side surface of the seventh lens are all convex at the near optical axis. Through reasonable design of the surface shape and the refractive power of each lens of the optical system, it is conducive to meeting the characteristics of large aperture, high relative luminance and large field of view.

The invention provides an imaging optical system and a camera module applying the same. A first lens has negative focal power, the object side surface of the first lens is a plane, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, and the object side surface of the second lens is a convex surface; the third lens has focal power; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface; by reasonably configuring the refractive power and the surface type of each lens, the optical lens can have the characteristics of small caliber, large field angle, high relative illumination and high resolution, and meanwhile, the total length of the lens is short, and the lens is lighter than a glass lens, so that the requirements of compactness and light weight are met.

The invention provides a large-view-field-angle high-uniformity augmented reality optical system, which optimizes the main light incident angle at a key surface by adjusting the surface type of an optical element and the light reflection position, so as to ensure that the system has higher relative illumination in a full-view-field range under the condition of a large view field angle, and improve the uniformity of the large-view-field-angle high-uniformity augmented reality optical system. Therefore, the whole picture has good uniformity. And meanwhile, the freedom degree is optimized by using each surface, various aberrations are mutually compensated, various performances of the whole view field are balanced, and the system is ensured to have good optical performance under the condition of a large view field angle. Different virtual image distances are achieved by moving the optical assembly, so that the wearing requirements of people with different diopters are met, and the excellent augmented reality display effect is achieved.

The invention relates to the technical field of optical lenses, particularly provides a lens assembly, a shooting device and cooking equipment, and at least solves the problem that an existing lens assembly is poor in imaging definition at ultrahigh temperature. The lens assembly at least comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged in the light incident direction, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a plane, and the image side surface of the sixth lens is a plane; the first lens and the second lens are spherical lenses, the third lens, the fourth lens and the fifth lens are aspheric lenses, and the sixth lens is an optical filter. The lens assembly has good relative illumination in a high-temperature environment, optical distortion is relatively small, and clear imaging can still be achieved in the high-temperature environment.

The embodiment of the utility model provides a detection device which is used for improving the relative brightness of small-size defects so as to improve the detection signal-to-noise ratio of the small-size defects. The detection device in the embodiment of the utility model comprises at least one detection module, the detection module comprises a linear light source, a first angle is formed between the emergent light of the linear light source and the normal of a to-be-detected object, and the first angle comprises 60-90 degrees; the turning prism is arranged along the emergent light direction of the linear light source and is used for changing the emergent light direction of the linear light source, so that the deflected emergent light of the linear light source is perpendicular to the luminous surface of the linear light source; when emergent light of the turning prism irradiates an object to be detected, dark field illumination is formed on the surface of the object to be detected, so that an imaging device in the detection device detects defects in the object to be detected according to scattering information of the object to be detected in the dark field illumination, and the object to be detected is provided with a periodic pattern.

To provide an inspection device of a nano-order columnar body and an inspection method of the nano-order columnar body, capable of increasing a relative luminance value even if a base material is a low reflection material, and capable of separating a difference in a nano-order columnar body shape level.SOLUTION: An inspection device 10 for a metal columnar body includes an optical path length changing unit 12 on which a measurement target material 21 is placed and which physically changes an optical path length, a vertical epi-illumination 11 that irradiates the measurement target material 21 with light and transmits reflected light from the measurement target material 21, and a luminance meter 13 that measures the reflected light from the measurement target material 21.SELECTED DRAWING: Figure 1

The application relates to the technical field of optical lenses, in particular to an optical lens for a video displacement meter, which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the light incidence direction, that is, a six-group seven-piece structure is adopted to meet the use requirements. The central field MTF value of the optical system is greater than 0.2 at 250 lp / mm, the edge field MTF value is greater than 0.2 at 200 lp / mm, the Fno is 2.6, the relative luminance is greater than 50%, the total optical length is less than 15 mm, the use object distance is short, is 20 mm, the horizontal object height is 35 mm, the optical distortion is 15%, and the optical lens is suitable for a 1 / 2.7 chip used by the video displacement meter.

The present application relates to a kind of all glass wide-angle optical lens, the optical system of lens is by the first lens, second lens, third lens, diaphragm, fourth lens, fifth lens and sixth lens in order along the light path of light incidence from left to right sequentially set composition;First lens is meniscus negative lens, second lens is double concave negative lens, third lens is double convex positive lens, fourth lens is double convex positive lens, fifth lens is meniscus negative lens, sixth lens is double convex positive lens, second lens and third lens constitute first cemented lens group, fourth lens and fifth lens constitute second cemented lens group, first lens, second lens, third lens, fourth lens and fifth lens are glass spherical lens, and sixth lens is glass aspheric lens.The present application is realized while 4K ultra-high definition imaging, and the sensitivity to environmental change is low, is not influenced by temperature and humidity and other environmental factors, wide-angle lens aperture value is smaller, relative luminance is high, and dark environment imaging effect is good.

The invention discloses an all-glass vehicle-mounted optical system and a camera module, the all-glass vehicle-mounted optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the focal power of the first lens is negative, the focal power of the second lens is positive, the focal power of the third lens is positive, and the focal power of the fourth lens is negative. The fourth lens and the fifth lens are glued to form a combined lens, the focal power of the combined lens is positive or negative, and the focal power of the sixth lens is negative and is-11 mmlt; f1lt; the thickness is-6.5 mm, and the thickness is 10.0 mmlt; f2lt; f2lt; the thickness is 19.0 mm, and the thickness is 15.0 mmlt; f3lt; f3t; the thickness is 20.0 mm, and the thickness is-58.0 mmlt; f61t; f61t; the focal length of each lens is reasonably configured, the infrared confocal medium-long focal lens satisfies a large field angle, the effective diameter of a component is limited, the size of the whole optical system is controlled, the incident angle of light is adjusted, the aberration of the system is effectively corrected, and the resolution of the system is improved. The all-glass vehicle-mounted optical system has the advantages of large target surface, small size, high resolution, high relative illumination and high imaging pixel, the uniformity of image illumination and the imaging definition are effectively improved, the head size of the lens is small, the shooting view field range is wide, and the production cost is low.

The invention discloses a wide-angle lens, relates to the technical field of optical imaging, and aims at solving the problems that an existing wide-angle lens is low in relative illumination, high in cost, poor in imaging effect and the like. The lens comprises seven spherical glass lenses and a diaphragm which are sequentially arranged along the optical axis, the diaphragm is located between the fourth lens and the fifth lens, the focal power of the lenses is distributed according to negative-negative-negative-positive-positive-negative-positive, and the fifth lens and the sixth lens are glued. The refractive indexes of the first, second, fourth and sixth lenses are gt; 1.9 and Abbe number lt; 30, satisfying a field angle gt; the relative illumination is gt; 94% and the like. While the processing and assembling cost is reduced and the mass production performance is improved, the ultra-wide field of view, the ultra-high illumination and the high resolution are realized, the chromatic aberration and aberration are corrected, the structure is stable, and the ultra-wide field-of-view optical lens is suitable for the fields of vehicle-mounted imaging, security monitoring and the like.

The application discloses an ultra-high-definition large-target-fish-eye lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the direction of the optical axis from the object side to the image side. The lens adopts a ten-piece design, and a fish-eye lens with a focal length of 2.9mm is realized. The total optical length is controlled within 30.3mm, the maximum outer diameter of the lens is less than 24.5mm, the maximum field of view of the lens can reach 198°, the relative luminance of the full field of view is greater than 67%, and the field of view utilization rate is high. The off-axis chromatic aberration value of the lens is less than 3um, the color difference restoration degree of the image is high, and the purple edge can be effectively inhibited.

The full-glass vehicle-mounted optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object plane to an image plane along an optical axis, and the optical system meets the following relations:-10.5 mmlt; f1lt; the thickness is-7.5 mm, and the thickness is-11.2 mmlt; f2lt; f2lt; the thickness is-7 mm, and the thickness is 8.5 mmlt; f3lt; f3t; the thickness is 10.8 mm, and the thickness is 12.0 mmlt; f4lt; f4t; the thickness is 17.5 mm, and the thickness is 20.0 mmlt; f7lt; f7lt; and the thickness is 28.0 mm. The full-glass vehicle-mounted optical system is configured to be composed of seven lenses, the number of the lenses is reasonable, the structure is simple, and the effective focal length of each lens is reasonably controlled, so that the optical system meets a large field angle, meanwhile, the effective diameter of a component is limited, the size of the whole optical system is controlled, the incident angle of light is adjusted, and the aberration of the system is corrected; the day-and-night confocal vehicle-mounted lens has the advantages of high resolution, large target surface, small size, high relative illumination, high-pixel imaging and the like, the uniformity of image illumination and the imaging definition are improved, the head size of the lens is smaller, the shooting view field range is wider, and the production cost of the day-and-night confocal vehicle-mounted lens is reduced.

The application discloses a large-aperture refractive telescope objective, which comprises eight lenses arranged in sequence along an optical axis from an object side to an image side, and air gaps between a first lens and a second lens and between a sixth lens and a seventh lens divide the whole telescope objective into three parts, the first lens constitutes a first part alone and is used for reducing the aperture of a rear-end lens and collecting large-view-angle light into the rear-end lens, the second lens to the sixth lens constitute a second part and are used for correcting aberration of the telescope objective, and the seventh lens and the eighth lens constitute a third part and are used for bearing optical power of the system. The telescope objective system has high robustness, compact structure, small assembling and adjusting difficulty, proper back aperture, and is favorable for installation of a detector, and has equal working F number and image F number, high relative luminance, large aperture and large view field, and the lens can adapt to long-term work in various environments.

This invention discloses a perception-based method and system for evaluating the visibility of MiniLED-LCD halos. First, a precise two-dimensional halo brightness distribution is obtained, and objective parameters related to halo visibility are extracted. Then, a halo perception boundary model is established based on the characteristics of human vision. Finally, a halo visibility index (HVI) is established, which is the logarithmic integral of the relative brightness of the halo perception area within the spatial field of view to characterize the visible halo flux on the retina. Experimental results show that HVI has a good correlation with standardized subjective perception (R0). 2 =0.95), and based on this, the effects of panel contrast ratio, number of backlight zones and viewing distance on HVI were further quantitatively analyzed. The proposed method provides a perceptually consistent evaluation benchmark for halo suppression and standardized evaluation of Mini-LED zoned backlight LCDs.

The utility model discloses a large aperture TOF lens and an electronic device. The large aperture TOF lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along an optical axis from an object side to an image side. The lens provided by the utility model adopts a seven-piece design, and a TOF lens with a focal length of 11.5 mm is realized. The maximum outer diameter of the lens is smaller than 16mm, the total optical length is smaller than 22mm, and the overall structure is compact. The F number of the lens is 1.0, the relative illumination of the full view field is greater than 60%, and the energy utilization rate is effectively improved. The lens can be matched with a 1 / 2 inch sensor for use, and the maximum field angle of the lens can reach 39 degrees. The optical distortion of the lens is less than 1.8%, the image restoration degree is high, and the difficulty of image recognition is reduced.

This invention provides an automatic method for extracting the shock layer and boundary of a blunt-nosed body based on high-speed camera images. It utilizes high-frequency imaging of the shock tube or shock tunnel experiment process using a high-speed camera, maps pixels to physical coordinates using spatial calibration, selects the region of interest in the image sequence and calculates the light intensity time series, and automatically identifies the effective time window of the experiment through rate of change analysis. Within the effective time window, representative frames are selected or averaged, and after dark flat-field correction, a one-dimensional light intensity profile is extracted. The location of the shock layer boundary is determined using a combination of gradient maxima and relative brightness thresholds. Finally, sub-pixel-level fitting and physical quantity conversion of the continuous boundary are achieved through conformal piecewise cubic interpolation. This invention, by constructing an automated boundary extraction process based on high-speed camera images, enables real-time identification and visualization of the shock layer location, providing reliable support for flow field structure diagnosis and quantitative analysis of experimental data.

The invention relates to an athermal day-night confocal high-definition telephoto lens and an imaging method, and the lens comprises an optical system which is composed of a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident path. Wherein the first lens and the second lens form a balsaming lens group, the third lens and the fourth lens form a balsaming lens group, and the sixth lens and the seventh lens form a balsaming lens group. According to the lens, the design of seven glass spherical lenses is adopted, the optical performance of large aperture, high resolution and day and night confocal is met by optimizing parameters and materials of the lenses, the relative illumination is high, and all-weather high-definition imaging is achieved; a glass material with a negative refractive index temperature coefficient is matched, so that passive athermalization design is realized, and good imaging quality is kept in a wide temperature range; the lens is low in tolerance sensitivity and easy to assemble.

The invention discloses an optical lens, a camera module and terminal equipment, a first lens has positive refractive power, and an object side surface and an image side surface of the first lens are respectively a convex surface and a concave surface. The second lens element with negative refractive power has a concave object-side surface and a concave image-side surface. The third lens element with positive refractive power has a convex image-side surface. The fourth lens element with positive refractive power has a convex object-side surface. The fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface, respectively. The sixth lens element with positive refractive power has a convex object-side surface. The seventh lens element with negative refractive power has a concave object-side surface. The optical lens satisfies the following relations: FOV is greater than or equal to 34deg and less than or equal to 42deg, and FNO is greater than or equal to 1.5 and less than or equal to 1.65. According to the optical lens, the camera module and the terminal equipment, the requirements of large aperture and high relative illumination can be met while high resolution is met.