414 results about "Dark zone" patented technology

The invention discloses a high-precision image processing method and system based on illumination adaptive compensation, and relates to the technical field of computer vision and image processing, and the method comprises the steps: inputting an original image, and dividing the image into a high-frequency edge layer, an intermediate-frequency texture layer and a low-frequency illumination layer through a multi-scale residual network; acquiring illumination intensity, color temperature and scene categories in real time by using an ambient light sensor and a scene semantic segmentation model, and generating dynamic compensation parameters; carrying out dynamic range expansion on a low-frequency illumination layer based on a physical illumination model, and adjusting the weight of highlight suppression and dark area enhancement through a self-adaptive S-shaped exposure curve; a double-branch generative adversarial network is adopted, noise suppression and super-resolution reconstruction are carried out on the high-frequency layer, and texture detail enhancement is carried out on the intermediate-frequency layer; aligning the data of the depth camera and the infrared sensor with the visible light image through a cross-modal fusion module; and performing tone mapping on the fused image based on human visual characteristics, and outputting an enhanced image with a high dynamic range and reserved details.

The invention discloses an image enhancement method and system in a complex coal mine environment, and relates to the technical field of image processing, and the method comprises the steps: carrying out the preprocessing of a collected coal mine image of a target region, and dividing the coal mine image into different semantic regions, including a bright region, a dark region and a dust shielding region, through a deep learning semantic segmentation model; according to semantic region characteristics, a differentiation enhancement strategy is made; a traditional Retinex model is improved, non-local mean filtering is introduced, and an illumination component and a reflection component are decomposed through pixel similarity matching. According to the method, the image is divided into the bright area, the dark area and the dust shielding area through the deep learning semantic segmentation model, differential enhancement strategies are formulated according to different area characteristics, detail distortion caused by global adjustment is avoided, local contrast suppression is adopted in the bright area, illumination compensation is enhanced in the dark area, and the image quality is improved. Noise diffusion of the dust shielding area is inhibited through edge preservation smoothing, the image quality of each area is remarkably improved, and it is ensured that image details in a complex coal mine environment are clear and visible.

The invention provides an intelligent control method for a floodlight illumination system, and the method comprises the steps: obtaining an environment surface roughness coefficient, spectral reflection distribution and spatial geometric change data, determining the wall surface material absorptivity and shielding region coordinates, and obtaining environment reflection characteristics and shielding distribution data; analyzing shielding boundary sharpness and shielding angle distribution according to the spatial geometric change and the coordinates of the shielding area, calculating a luminous flux distribution curve of a local dark area, and judging whether the influence range of the dark area exceeds a preset threshold range or not; calculating the illumination coverage integrity according to the updated light field distribution and polarization reflection characteristics, determining the boundary sharpness of a light beam, and obtaining a light field uniformity parameter; and according to the light field uniformity parameter and the shielding thermal radiation effect, calculating and optimizing light field parameters.

The invention relates to a light spot uniformity optimization method and system for a high-precision VCSEL device, and the method comprises the following steps: carrying out the light field collection of a light-emitting surface of the VCSEL device, obtaining the intensity distribution of original light spots, analyzing the non-uniformity of each light-emitting unit, and extracting the non-uniformity characteristics of the light spots. And carrying out deviation cause analysis based on the characteristics, and identifying device structure deviation parameters. According to the method, an etching process is optimized, a corrected oxidized aperture configuration scheme is obtained, near-field light field simulation is carried out by adopting a finite difference time domain method, and optimized light field distribution is verified and predicted. And finally, adaptive compensation design is carried out on the Bragg reflector structure based on a prediction result, light field regulation and control are realized, target light spot uniformity distribution is finally obtained, and the problem that systematic analysis and feedback control on non-uniformity causes of a light emitting unit layer in a device are lacked in the prior art is solved. And local bright spots or dark areas are caused.

The invention discloses a nighttime image enhancement method based on multidirectional information extraction and color loss optimization, which comprises the following steps: firstly, collecting nighttime and normal light road scene images, constructing a nighttime road image enhancement model based on deep learning, and adopting an image enhancement framework based on GAN and a superficial layer semantic enhanced U-Net network as a generator; the five-layer convolutional network is used as a discriminator, then horizontal-vertical bidirectional differential convolution is used to extract multi-directional information of the image, a local illumination attention module is used to balance dark area brightness and bright area overexposure, and finally an adaptive color loss function is used to recover original colors of the image. The method can effectively solve the problems of image quality reduction, detail loss, color distortion and the like under the low-illumination condition, and is particularly suitable for night scene visual perception improvement in the field of vehicle-assisted automatic driving.

The invention discloses a heat exchanger welding seam image enhancement processing method, and belongs to the technical field of image processing, and the method comprises the steps: S1, collecting a heat exchanger welding seam original image through a preset collection module, and converting the original image into a grayscale image; s2, a processing module is preset, the gray level image is segmented based on a preset dynamic threshold value, and a welding seam area image and a base metal area image are generated; s3, in the welding seam area image, generating a first enhanced image, a second enhanced image and a third enhanced image through a preset generation module; and S4, extracting a reference edge contour of the weld joint area image from the base metal area image, performing pixel-level fusion on the first enhanced image, the second enhanced image and the third enhanced image, and outputting a weld joint image. According to the method, the weld joint area is divided into the highlight area, the dark area and the middle area to be processed respectively, weld pool texture loss caused by strong reflection is effectively restrained, and the problem that details are lost in a highlight scene in an existing method is solved.

The invention provides a floor wear resistance detection method and system, is applied to the technical field of floor wear detection, and reflects the wear resistance of a floor coating by obtaining the variation of porosity before and after floor wear. When the porosity after abrasion is obtained, a two-dimensional optical image of a to-be-detected surface is collected through multi-direction illumination, and the image is subjected to alignment processing. By analyzing the light and shade change information and the shadow form information of the dark area in different illumination directions, when the light and shade change information of the dark area changes along with the change of the position of the light source and the shadow form information shows the dynamic change of rotation or movement, it is judged that the hole is the floor hole. The discrimination mechanism based on the illumination dynamic change effectively solves the problem that a two-dimensional optical microscope scheme in the prior art cannot distinguish real pores and shallow scratches, and avoids misjudgment of scratches generated by a large amount of wear as pores, thereby significantly improving the accuracy of porosity calculation after wear.

The invention discloses a method for testing short-circuit current of a solar cell. The method comprises the following steps: acquiring a first corresponding relation between the photoluminescence intensity of a standard cell under standard illumination intensity and the electroluminescence intensity of the standard cell under open-circuit voltage; providing a battery piece to be tested; irradiating partial areas of the first surface of the to-be-measured battery piece through a plurality of light sources with different wavelengths, and measuring to obtain bright area luminous intensity of a light receiving area and dark area luminous intensity of a non-light receiving area under the irradiation of the light sources with different wavelengths; according to the first corresponding relation and the luminous intensity of each bright area, obtaining basic electroluminescence intensity corresponding to the luminous intensity of each bright area; obtaining the equivalent external quantum efficiency under the irradiation of each wavelength light source according to the basic electroluminescence intensity and the dark space luminescence intensity corresponding to each wavelength light source; constructing a wavelength-equivalent external quantum efficiency curve; carrying out integral calculation on the wavelength-equivalent external quantum efficiency curve to obtain short-circuit current density, and calculating the short-circuit current of the battery piece to be measured according to the area of the first surface.

The invention relates to a low-illumination image enhancement method based on multi-mode classification and brightness feedback, and belongs to the field of image processing. The method comprises the following steps of: firstly, training a network, constructing a multi-modal illumination prior feature of an image, inputting the multi-modal feature and a brightness score of the image into an illumination perception classification network, obtaining a local probability value of image brightness, adaptively selecting a local or global enhancement processing method, and generating a fusion weight; in the local enhancement processing, dark area details are enhanced through a multi-scale parallel and double-attention mechanism, in the global enhancement, the brightness is improved by using a symmetric coding-decoding structure and a residual attention block, and linear fusion is performed after the brightness is enhanced; then, the brightness evaluation value of the image is fed back through the lightweight brightness estimation network, and the brightness of the image is enhanced. And optimizing the training network according to the joint loss function of image processing. The method provided by the invention can enhance image texture details and improve image definition under a non-uniform illumination condition and an extremely low illumination condition.

The invention discloses an intelligent identification monitoring and cooperative emergency system, which comprises a main body case, a double-shaft rotating mechanism, an annular light supplementing assembly, an integrated base and an intelligent analysis module, and is characterized in that the main body case comprises a first rotating device, an imaging module and a second rotating device; the double-shaft rotating mechanism comprises a horizontal rotating shaft and a pitching adjusting shaft; the annular light supplementing assembly comprises a light supplementing lamp array and a honeycomb anti-dazzle cover. The integrated base comprises a communication gateway and an emergency controller; the intelligent analysis module comprises an edge calculation unit and a response priority unit. Therefore, the beam splitter prism fuses visible light and infrared thermal imaging coaxial acquisition, the electromagnetic shielding design of the double-shaft rotating mechanism is combined, the imaging precision and stability are improved, the annular light supplementing assembly, the three-color-temperature LED module and the edge calculation unit cooperate, illumination is dynamically adapted, dark space glare is eliminated, an emergency controller hardware-level linkage device triggers instructions according to priorities, and therefore the imaging accuracy and stability are improved. The response time is shortened.

The invention belongs to the technical field of computer vision and image processing, and discloses a low-light image enhancement method and system based on space-frequency domain feature resolution self-adjustment. According to the enhancement method, a feature splitting and splicing process, a space-frequency domain feature resolution self-adjusting network architecture based on an encoder-decoder framework, and a complete processing process from low-light image input to normal illumination image output are provided. According to the method, a multi-scale feature map is further flattened into a two-dimensional matrix, image restoration is carried out from features of different scales through a linear layer and a feedforward neural network, and the integrity of a receptive field is further kept; besides, after the important spatial features are extracted, frequency restoration is carried out on the important area, the common problem that the dark area is excessively enhanced and details of the bright area are lost is effectively solved, and the color fidelity and the structural integrity in the low-illumination scene are better.

The invention provides a control method and a control system for building an independent acoustic space of an automobile cabin, which are applied to the technical field of sound field control of the automobile cabin, and are used for inputting a multi-channel vibration signal acquired in real time into a deep learning noise prediction model to obtain an in-automobile background noise prediction value at a future moment; the prediction noise is filtered by the secondary path estimation model and then is used as a feedforward reference signal for active noise reduction, and the prediction noise and a residual signal collected by a bright area error microphone are jointly used for weight updating of an adaptive filter; the updated filter generates a reverse-phase noise elimination signal and the reverse-phase noise elimination signal is played by a secondary loudspeaker in real time so as to counteract background noise of the bright area; and closed-loop adjustment of the noise reduction effect is formed based on the sound pressure level contrast ratio of the bright and dark areas, so that the independent acoustic space is kept stable in the time-varying environment of vehicle driving. According to the method, the low noise of the bright area and the isolated sound field of the dark area in the vehicle are realized by fusing deep learning noise prediction and active noise control, and the personalized auditory experience in the vehicle can be remarkably improved.

The embodiment of the invention provides a control method for sound partitions in a space, electronic equipment, a vehicle and a medium, and the method comprises the steps: determining a first sound source pulse response of a target sound field, the first sound source pulse response being a pulse response of a preset sound source in front of the target sound field; and based on an electro-acoustic transfer function of a bright area, the first sound source pulse response, an electro-acoustic transfer function of a dark area and an optimization function, determining a driving signal of each loudspeaker, namely, restraining the first sound source pulse response as a pulse response of a preset sound source in front of the target sound field, and finally, determining a more accurate loudspeaker driving signal through an optimization function. Therefore, it is clear that the sound image position of the replay sound field is right ahead of the listener, and the listening comfort is improved.

The invention relates to the technical field of artificial intelligence, and discloses a low-illumination scene-oriented unmanned aerial vehicle imaging data enhancement method, which comprises the following steps of: S1, acquiring unmanned aerial vehicle imaging data and constructing a training data set; s2, data preprocessing based on illumination partition; s3, constructing and training a data enhancement model; and S4, enhancing the imaging data of the unmanned aerial vehicle. The data preprocessing based on the illumination partition in the step S2 comprises the following steps: generating a low-illumination area mask and a medium-illumination area mask based on the brightness information of the low-illumination image; a Gaussian smooth convolution operation is applied to the low-illuminance region identified by the low-illuminance region mask to suppress noise, and an original value is reserved for the medium-illuminance region identified by the medium-illuminance region mask to generate a pre-processed image. The problems of low-illumination image noise amplification and detail loss are solved by generating low-illumination region masks and medium-illumination region masks and respectively adopting noise reduction and retention strategies, and the balance of dark region noise reduction and bright region detail protection is realized.

The invention discloses an ocular surface illumination treatment device and method, and belongs to the technical field of ophthalmology medical equipment and treatment. The device comprises an infrared camera module, a computer terminal analysis control module, an optical power detection module, a mechanical adjustment module, a safety switch module and an illumination module. Wherein the infrared camera module comprises an infrared CCD (Charge Coupled Device) camera and a near-infrared light source which are arranged at a preset included angle and can collect eye images and transmit the eye images to the computer terminal, and the highest recording speed of the infrared camera module is not lower than 200 frames per second; and the computer terminal analyzes the image to obtain pupil positions, diameters and distances, and adjusts relative positions of a shielding device and a lens group in the light path of the illumination module, the axis of the light path and the distance between left and right lens cones, so that the central dark area of the annular light spot is matched and overlapped with the pupil. Eye images are collected and processed firstly, then light spots and the lens cone are adjusted, finally phototherapy and real-time monitoring are carried out, light can be prevented from entering the fundus, the treatment safety is improved, and the device is suitable for ocular surface diseases such as xerophthalmia.

A device for image processing includes processing circuitry configured to perform black level remapping. To perform black level remapping, the processing circuitry is configured to: determine luminance values for pixels of a first image, wherein the pixels of the first image are based on color values of samples in each color frame of a plurality of color frames of the first image, wherein each color frame is associated with a different color; determine a first threshold based on the luminance values; determine a mapping curve based on the first threshold and a second threshold; apply the mapping curve to color values of a set of the samples in each color frame to generate black level remapped samples for each color frame, the set of the samples having a color value between the first threshold and the second threshold; and generate a second image based on the black level remapped samples.

The invention discloses an image processing method, an electronic device, a vehicle and a storage medium. The method comprises the following steps: identifying a dark area and a bright area in a preview image; determining a surrounding exposure parameter, the surrounding exposure parameter including a long exposure parameter, an appropriate exposure parameter and a short exposure parameter, the long exposure parameter being determined based on a dark area of the preview image, and the short exposure parameter being determined based on a bright area of the preview image, the appropriate exposure parameter is determined based on an initial exposure parameter of the preview image. The image obtained based on the long exposure parameter can reflect the details of the dark area, the image obtained based on the short exposure parameter can reflect the details of the bright area, the appropriate exposure parameter can accurately present the details and layers in the picture, and the imaging effect and the imaging quality of the preview image are ensured, namely, the image can be displayed in the dark area. The details from the shadow part to the highlight part in the scene to be shot can be captured based on the surround exposure parameters, the accuracy is high, and the use experience of a user can be ensured.

The invention relates to the technical field of image data processing, in particular to an impurity identification method and system for fruit and vegetable powder, and the method comprises the steps: collecting a fruit and vegetable powder image on a conveying belt, preprocessing the image into a gray-scale map, and calculating a dark channel index based on the gray-scale distribution characteristics in a neighborhood window to preliminarily screen a dark region; counting dispersion of gradient amplitude and information entropy of gradient direction in a pixel point neighborhood window, distinguishing smooth shadow and rough impurities by using the dispersion and the information entropy, and correcting a dark channel index to obtain impurity confidence; constructing a local histogram by using the impurity confidence as a weight, and carrying out adaptive weighted histogram equalization processing on the grey-scale map to enhance the impurity contrast and suppress the shadow; and completing impurity identification through Otsu threshold segmentation and connected domain analysis. According to the method, the problem that shadow is easily misjudged as impurities when accumulated powder is processed by a traditional algorithm is effectively solved, and the detection accuracy is improved.

The invention relates to the field of car lamps, and discloses a car lamp diffuse reflection optical structure which comprises a light source, a light guide plate, a light guide plate and a light guide plate. The light guide structure is mounted in the automobile lamp shell, is arranged on a light emitting path of the light source and is used for receiving light of the light source and changing the propagation direction of the light; the diffuse reflection structure is installed in the automobile lamp shell and used for receiving the light processed by the light guiding structure, the light is scattered multiple times through surface textures, and diffuse reflection light spots evenly scattered to the visual face are formed. According to the invention, through the multi-stage scattering design of the thick-wall condenser, the dodging sheet and the frosted reflector, the light forms a uniform diffuse reflection effect without obvious light spots and dark areas on a visual surface, no granular sensation is generated when the light is lightened, the light is uniformly diffused according to the diffuse reflection principle, the direct strong light caused by the traditional mirror reflection is avoided, and the brightness of the light source is improved. And glare interference to drivers of vehicles and pedestrians is reduced.

The invention provides a transparent antenna lens and intelligent glasses, and belongs to the technical field of intelligent glasses. The antenna transparent substrate is arranged on the lens body. The plurality of first metal structures are arranged on the surface of the antenna transparent substrate and are far away from the lens body, so that the lens body and the transparent antenna are combined and can support each other, and the transparent antenna is arranged on the lens of the glasses. The design space of the transparent antenna is not limited by the size of the glasses legs any more and is far away from the head of the human body, the problem that the electromagnetic performance is low due to the fact that the human body absorbs and scatters electromagnetic waves and is limited by the size is solved, and the electromagnetic performance of the transparent antenna is greatly improved. The multiple first metal structures are connected and surround to form the irregular polygonal metal grid, so that the problems of bright diffraction fringes and dark areas caused by coherent interference generated by the periodic metal grid can be solved, and a user can see a clearer and more accurate image.

The invention provides an image adjusting method and device, electronic equipment and a storage medium, and belongs to the technical field of computers. The method comprises the steps of obtaining an image displayed by a device screen under the condition that an ambient light condition of the device screen exceeds a preset ambient light condition, determining an RGBA value of each pixel in the image, determining a dark area of the image based on the RGBA value of each pixel in the image, and determining a dark area of the image according to a dark area ratio and a dark area contrast ratio of the dark area. And determining a contrast adjustment factor, and adjusting the image according to the contrast adjustment factor. Therefore, the contrast adjustment factor is determined according to the dark part proportion and the dark part contrast of the dark part area in the image, and the image is adjusted based on the contrast adjustment factor, so that the technical problems of overexposure and color distortion of the bright part area caused by blindly improving the overall contrast of the image can be solved.

Provided is a vehicle lamp which forms a travel light distribution pattern in which occurrence of a dark area between low and high beam light distributions is suppressed. A projection lens is divided into a plurality of lens areas, each of which has a different focal point position, and one second lens area is a low lens area. A low beam light source module is set such reflected light from the reflector is incident on a back surface of the second lens area, and a low beam light distribution is emitted from an area front surface. A high beam light source module is set such that emitted light from a high beam light source is directly incident on a lens back surface of the projection lens, and a high beam light distribution for each area is emitted from each of a plurality of area front surfaces.

The invention relates to the technical field of cleaning equipment, and discloses a light-sensitive cleaning equipment lighting system and application thereof.The system collects ground illumination intensity in real time through an ambient light detection module, a control unit dynamically adjusts the brightness of a lighting module based on a nonlinear dimming algorithm, and multiple modes are divided according to the illumination intensity; and the cleaning parameters are linked to realize cooperative control. Meanwhile, the ground material identification module detects the ground reflection characteristics through an infrared reflection sensor, and the illumination strategies are optimized for high-reflection materials and low-reflection materials respectively. Experimental data show that compared with a traditional fixed brightness scheme, the system saves energy by more than 40%, the dark area dust recognition rate is improved by 60%, the glare intensity is reduced by 50%, the problems of poor environmental adaptability, low energy efficiency, single function and the like in the prior art are effectively solved, the system is suitable for intelligent cleaning equipment such as a sweeping robot and a handheld dust collector, and the cleaning efficiency and the user experience are remarkably improved.

The invention relates to the technical field of holographic gratings, in particular to a holographic grating with a high refractive index modulation degree and a preparation method thereof, and the preparation method comprises the steps: coating a grating substrate with a precursor material to form a coating, and preparing a holographic dry plate with a holographic material layer; performing interference exposure on the holographic plate to obtain a semi-finished grating; bleaching the semi-finished product grating, and soaking the semi-finished product grating in an extraction liquid to obtain a grating precursor with a groove; and filling the groove with a fluorine-containing polymer dopant to obtain the holographic grating. The part, corresponding to the exposure bright area, of the grating precursor with the grooves is a polymer with a high refractive index, the inert body in the exposure dark area is removed, air is left, the grooves are formed in the surface of the grating, the appearance of the grooves fluctuates, the grooves are filled with low-refractive-index substances, and finally the high-refractive-index substances in the bright area are formed. The dark area is of a grating structure made of a low-refractive-index material; by adopting a two-step processing method, the holographic grating without light leakage in the reverse direction can be manufactured.

A method for heating a furnace is provided in which in the furnace has at least one heating zone which is heated by combusting a fuel with an oxidant. The furnace further has a dark zone, downstream of the heated zone, to which) no fuel is supplied directly. The fuel and oxidant are supplied to the heating zone is substoichiometric manner, in that between 10% and 40% of the total oxidant for achieving stoichiometric or near stoichiometric combustion is supplied directly to the dark zone. The flue gas temperature is measured in and / or downstream of the dark zone, and the share of the total oxidant supplied to the dark zone is controlled so as not to exceed a predetermined maximum measured temperature. A method for retrofitting an existing furnace is also provided.

The invention belongs to the technical field of optical equipment detection, and particularly relates to optical lens defect detection equipment which comprises a bottom plate, a supporting column rotationally installed on the bottom plate, a telescopic pipe fixedly installed at the top end of the supporting column, a suction cup fixedly installed at the top of the telescopic pipe, and an electric push rod fixedly installed in the supporting column. A round block is fixedly installed at the output end of the electric push rod, a sliding groove is formed in the bottom plate and located on one side of the supporting column, and a sliding plate is slidably installed in the sliding groove. According to the whole device, the edge of the outer lens of the lens does not need to be manually coated with ink by personnel, the working efficiency of the personnel is greatly improved, meanwhile, dust attached to the surface of the lens can be scraped out, part of incident light rays cannot be shielded, shadows or scattered light spots cannot be formed, and the situation that the detection result is affected due to abnormal dark areas or bright spots in a detection image is avoided.

The application discloses an integrated double-color-temperature lamp box light source, and belongs to the technical field of illumination light sources.The integrated double-color-temperature lamp box light source comprises a shell and a control module, the shell is a hollow cylindrical structure, an installation cavity is arranged in the shell, and the inner wall of the shell is provided with annularly arranged heat dissipation fins; the annularly arranged heat dissipation fins and heat dissipation through holes form a high-efficiency heat dissipation channel, the heat dissipation channel is matched with a heat-conducting pad to quickly conduct the heat of a substrate, and the working stability and service life of LED lamp beads are significantly improved; warm-color-temperature and cold-color-temperature LED lamp beads are alternately and uniformly arranged in an annular manner, light mixing is more uniform and soft, there are no obvious color-temperature partition and dark area, and the color rendering effect is better; the color temperature and brightness can be flexibly adjusted by cooperating a light-adjusting knob with a wiring rear seat, different illumination scene requirements can be adapted, the sealing property of a wiring position is improved by a waterproof sealing pad, the overall structure is compact, installation and positioning are accurate, integrated design is realized, the assembly efficiency is high, and the integrated double-color-temperature lamp box light source has the advantages of excellent heat dissipation, accurate control, safety in use, wide applicability and the like.

The vehicle-mounted backlight module comprises a lower frame, a light bar and a light guide plate, the lower frame comprises a bottom plate and a side frame, the bottom plate is fixedly connected to the side frame and forms a containing cavity, the light bar is fixedly connected to the side frame, the light guide plate is arranged in the containing cavity, the light guide plate comprises a boss, and the boss is fixedly connected to the side frame. The lamp strip comprises a plurality of LED lamps and a flexible circuit board, the LED lamps are electrically connected to the flexible circuit board, the boss abuts against or is connected to the flexible circuit board, and the LED lamps are arranged between the bottom plate and the boss in the vertical direction. The vehicle-mounted backlight module capable of improving the corner dark area can solve the problems that in the prior art, the corner dark area appears in the light emitting area, and the boss of the light guide plate is broken, and the display effect and the stability of the backlight module are improved. The utility model further relates to a vehicle-mounted display device.

The T8 lamp tube comprises a light-transmitting lamp tube body with a through cavity penetrating in the axial direction, and is characterized in that a lighting source is arranged at a port of one end of the through cavity, the irradiation direction of the lighting source faces a port of the other end of the through cavity, a refraction lens covers the lighting source, and a reflection mirror is arranged at a port of the other end of the through cavity; the refraction lens and the reflection mirror are oppositely arranged. The T8 LED lamp tube has the advantages that the structure is simple, and the problems that the light emitting direction of a traditional T8 LED lamp tube is concentrated, a dark space exists, and the beam angle is limited are fundamentally solved through the secondary optical design of refraction and reflection.

The present application relates to the technical field of thermal process, and especially relates to a method for optimizing edge searching precision of a surface inspection system, which divides a gray scale distribution into two regions of light and dark based on a gray scale reference value; sets a fixed edge threshold parameter or a variable edge threshold parameter for the surface inspection system; resets a periodic parameter; collects defect data in a way of training, modifying and adding; and optimizes a detection region. The present application has the following advantages: the gray scale range is expanded from 0-255 to 0-280, the reference value is increased from 128 to 140, and the light and dark regions are redivided, so that the defect pixel distribution is more balanced; for the working condition that the dark strip steel is close to the worn roller surface, the edge searching accuracy is improved, the positioning error is reduced, and the edge searching drift caused by the change of steel type and the wear of roller surface is solved; and the fixed and adaptive double-mode edge threshold strategy is adopted, the threshold value in the region within 30mm from the edge is narrowed by 20%-30%, and the fixed mode reduces the false positive rate.