A design method for instrument panel data reading device based on image recognition

Abstract

The present invention discloses an instrument panel data reading device based on image recognition and a design method thereof. The device comprises a main body shell, wherein a rectangular passage which passes through from front to back is provided inside the main body shell, a bonding plate is fixedly connected to the outside of the front end of the main body shell, and an elastic sealing member is sleeved on the outside of the bonding plate. The present invention arranges a first expansion box and a second expansion box which expand outward on both sides of the main body shell, embeds a camera module into the second expansion box, and arranges a desiccant in the first expansion box to absorb water vapor, so as to work in a closed environment and keep dry, utilizes a black frosted acrylic plate in combination with a shading plate to achieve a light-shielding effect, and an oblique shooting method for the data display area of ​​the instrument, so that the background of the instrument panel image is the inner wall of the recognition device reflected by the mirror image of the instrument panel surface, the background color is uniform, the reflection problem is solved, and there is no high light area with strong contrast, and intelligent fill light is performed by an LED fill light strip to achieve acquisition and recognition of instrument data, thereby improving the accuracy of recognition.

Description

Technical Field

[0001] The present invention relates to the technical field of camera vision recognition, and in particular to an instrument panel data reading device based on image recognition and a design method thereof. Background Art

[0002] At present, the products on the market that use machine vision for instrument data collection are mainly intelligent inspection robots used in relatively open and flat areas such as substations and power plants. In such scenarios, robots can pass easily and instruments are relatively concentrated. In addition, the license plate recognition device at the entrance and exit of the parking lot also uses image digital recognition technology. What they have in common is that the place where images are obtained is concentrated, and multiple cameras are not required for image acquisition. Therefore, most of the cameras used are high-cost ultra-high-definition high-speed cameras. For some application scenarios in complex environments, such as mines, many instruments are distributed, so multiple cameras need to be arranged, or even one camera per instrument to obtain data. Single image acquisition products with high costs are not suitable for such environments. Therefore, manual meter reading is traditionally used to obtain instrument data. However, the data obtained by manual meter reading is not very accurate, and problems such as missed reading and duplicate data may occur. In addition, there are many dangerous factors that threaten the life safety of meter readers.

[0003] For the smart energy integrated management system that needs to be implemented and constructed, it is essential to obtain and compile a large amount of data, which can help establish a mathematical model for energy regulation and optimize energy load scheduling and other energy allocation issues. However, the data collection of this part is somewhat difficult.

[0004] In response to the above situation, we investigated many technologies and product information on the market, such as Sanhe Intelligent's Yidu Intelligent AI Camera, and many related patent documents. The main principle of the instrument image recognition device is to use the camera equipment in the product to take photos at regular intervals, transmit the photos to the terminal for recognition by the algorithm, and store the recognized data in the database for easy viewing and retrieval. There are problems such as uneven lighting and overexposure when shooting images. The existence of these problems will affect the readability of the dashboard data. At present, most image recognition devices use brightness adjustment algorithms to solve this problem, but due to different environments, the recognition data may be incorrect, and the recognition effect needs to be improved. And when used in complex environments, its accuracy will also decrease due to water vapor, dust, etc. covering the dashboard and camera. Water vapor may carry corrosive substances and affect the electronic components inside the instrument recognition device, and the monitoring cost is high.

[0005] Therefore, the present invention designs an instrument panel data reading device based on image recognition and a design method thereof, and further solves the above-mentioned problems by improving the hardware structure of the device and optimizing the recognition accuracy. Summary of the invention

[0006] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art and provide an instrument panel data reading device based on image recognition and a design method thereof. A first expansion box and a second expansion box are arranged on both sides of the main shell, a camera module is embedded in the second expansion box, and a desiccant is arranged in the first expansion box to adsorb water vapor. It works in a closed environment and keeps dry. A black frosted acrylic plate is used in combination with a shading plate to avoid light, and the data display area of ​​the instrument is photographed at an angle. The background of the obtained instrument panel image is the inner wall of the recognition device reflected by the mirror image of the instrument panel surface. The background color is uniform. The problems of uneven lighting and overexposure are solved through structural design, and the recognition accuracy and work efficiency can be further improved.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A dashboard data reading device based on image recognition comprises a main body shell, wherein a rectangular channel penetrating from front to back is provided inside the main body shell, and a bonding plate is fixedly connected to the outer side of the front end of the main body shell, and an elastic sealing member is sleeved on the outer side of the bonding plate, and a transparent baffle bonded to the inner wall of the rectangular channel is provided at the rear end of the main body shell, and a first expansion box and a second expansion box for outward expansion are respectively provided on the two side walls of the main body shell, and the ends of the first expansion box and the second expansion box are both connected to the rectangular channel, and the first expansion box and the second expansion box are both integrally arranged with the main body shell;

[0009] The main body shell is made of a black frosted acrylic plate, so that its inner wall forms a pure black background wall;

[0010] A desiccant filler is provided inside the first expansion box to keep the internal environment of the main shell dry;

[0011] A camera module is provided inside the second expansion box, and the camera module includes a camera that is tilted, and the tilt angle of the camera can be adjusted so that the camera can tilt to shoot the data display area of ​​the instrument;

[0012] Both sides of the main shell are provided with shading plates, which are movably mounted on the main shell through the adjusting part, so that the position and angle of the shading plates are adjustable;

[0013] A circle of surrounding mounting groove is provided at the tail end of the inner wall of the rectangular channel, and an LED fill light strip is embedded in the surrounding mounting groove. A circle of soft light film is arranged on the outside of the surrounding mounting groove to scatter the light and fill in the display area of ​​the instrument. At the same time, the inner wall of the main shell will not form a high-light area with strong contrast.

[0014] Preferably, the transparent baffle is made of optical glass, a silicone sleeve is sleeved on the outer side of the optical glass, and the elastic sealing member is made of rubber material.

[0015] Preferably, the desiccant filler is made of color-changing silica gel desiccant, and the color-changing silica gel desiccant is filled in the drying box;

[0016] A replacement port is provided on the side wall of the first expansion box, and the drying box enters the first expansion box through the replacement port. A gauze is provided between the first expansion box and the rectangular channel. A sealing cover is inserted into the replacement port, and a sealing silicone layer is provided on the outside of the sealing cover.

[0017] Preferably, the adjustment part comprises a telescopic connecting rod, both ends of which are provided with ball joints, one of which is bonded and fixed at the center of the sunshade, and the other is bonded and fixed to the main body shell.

[0018] Preferably, the device further comprises a wiper linkage mechanism, which is mounted on the outer side wall of the rear end of the main shell, a driving mechanism is provided at the input end of the wiper linkage mechanism, and a sweeping brush is installed at the active end of the wiper linkage mechanism for automatically cleaning the transparent baffle.

[0019] Preferably, the device also includes an air pump, which is installed on the outside of the main shell. The air pump input end extends into the rectangular channel through a pipeline. When working, the dust inside the rectangular channel is discharged and the inside of the rectangular channel is close to a vacuum state.

[0020] Preferably, a light sensor is provided at the front end of the rectangular channel for sensing the light intensity of the environment in which the instrument is located. A single-chip microcomputer is installed inside the main shell. An A / D converter and a D / A converter are provided at the input and output ends of the single-chip microcomputer respectively. The light sensor is electrically connected to the A / D converter, and the LED fill light strip is electrically connected to the D / A converter.

[0021] A design method for a dashboard data reading device based on image recognition comprises the following steps:

[0022] S1. Plan the size of the instrument panel data reading device: According to the external dimensions of the instrument to be identified and the external dimensions of the data display area, the length, width and height of the instrument panel data reading device are designed as follows:

[0023] S11, determine the cross-sectional length of the main housing: measure the distance from the side edge of the data display area to the edge of the instrument side wall that is far away, and the measured length value is α, then α is used as the length dimension of the main housing;

[0024] S12, determining the cross-sectional width of the main body shell: measuring the width of the data display area, measuring the width value β, and setting a value greater than β as the width dimension of the main body shell;

[0025] S13, determining the depth of the main body shell and the depth of the camera installation position in the main body shell: performing the following steps to obtain the required values;

[0026] S131, obtaining w1: w1 is a measured value of the horizontal distance between the camera and the edge of the data display area on the second expansion box side;

[0027] S132, obtaining w2: w2 is a measured value of the horizontal distance between the inner wall of the main body shell on the first expansion box side and the edge of the data display area on the second expansion box side;

[0028] S133, setting the depth of the main body shell to h2, and the depth of the camera installation position in the main body shell to h1;

[0029] S134, substituting w1, w2, h1 and h2 into the following formula to determine the values ​​of h1 and h2;

[0030]

[0031] S135, assembling the instrument panel data reading device: loading the components required for the work on the main body shell designed according to the outer dimensions of the instrument and the outer dimensions of the data display area to form the overall structure of the instrument panel data reading device;

[0032] S2. Docking installation: Place the instrument panel data reading device outside the instrument to be monitored. The specific steps are as follows:

[0033] S21, aligning the bonding plate so that it corresponds to the outside of the data display area;

[0034] S22, correct the position of the bonding plate: move the instrument panel data reading device in the length direction of the main shell so that the outer wall of the main shell located on the second expansion box side coincides with the edge of the instrument side wall, and the outer wall of the main shell located on the first expansion box side coincides with the boundary of the data display area; move the instrument panel data reading device in the width direction of the main shell so that the data display area is located within the frame of the main shell;

[0035] S23, adjusting the tilt angle of the camera: according to the performance parameters of the camera, including the focal length, resolution and installation position of the camera, adjusting the camera so that the edge of the shooting field coincides with the edge of the data display area on the second expansion box side, and finally making the collected data display area image at the far left and close to the inner wall edge of the main shell;

[0036] S24, sealing the rectangular channel, pressing the main body shell so that the laminating plate is tightly attached to the data display area by using the external elastic sealing member, so that a closed space is formed inside the rectangular channel;

[0037] S3, light and shadow effect adjustment: including the following steps:

[0038] S31, using the adjustment unit to change the position and inclination of the shading plate, and adjusting it to a position that can block strong external light from directly irradiating the camera and the inner wall of the main body shell on the first expansion box side according to the external lighting environment and the installation position and orientation of the instrument, so that the shading plate blocks strong external light from directly irradiating the camera and the inner wall of the main body shell on the first expansion box side, thereby enhancing the uniformity of the color of the captured instrument image and preventing it from being overexposed;

[0039] S32. Automatically adjust the brightness of the LED fill light strip according to the illumination of the environment where the instrument is located, so as to achieve fill light in a confined space, enable the camera to capture clear images, and enable digital recognition of the acquired images.

[0040] Preferably, in S2, a fixed collection method is adopted when arranging the instrument panel data reading device, as follows:

[0041] Multiple instrument panel data reading devices are matched one by one with multiple instruments, and the main body shell is installed on the outside of the instrument in a fixed-point manner through a fixing frame to achieve data acquisition and identification.

[0042] The present invention has the following beneficial effects:

[0043] 1. By arranging the first expansion box and the second expansion box on both sides of the main shell, the camera module is embedded in the second expansion box, and a desiccant is arranged in the first expansion box to absorb water vapor, the camera module works in a closed environment and keeps dry. The black frosted acrylic plate is used in combination with the shading plate to avoid light, and the data display area of ​​the instrument is photographed at an angle. The background of the instrument panel image is the inner wall of the recognition device reflected by the mirror image of the instrument panel surface. The background color is uniform, which solves the reflection problem, and there is no high-light area with strong contrast. The LED fill light strip can also be used for intelligent fill light, so as to realize the acquisition and recognition of instrument data and improve the recognition accuracy.

[0044] 2. By planning and designing the size of the instrument panel data reading device, the length, width and height of the instrument panel data reading device are designed according to the outer dimensions of the instrument to be identified and the outer dimensions of the data display area, so that the edge of the camera's shooting field of view coincides with the edge of the data display area on the second expansion box side, and finally the collected image of the data display area is at the far left and close to the edge of the inner wall of the main shell, so that a clear and recognizable instrument image can be captured, which is convenient for correcting the tilted image using the tilt correction algorithm;

[0045] 3. By docking and installing the instrument panel data reading device with the instrument panel, a closed space is formed between the instrument panel data reading device and the instrument panel. A cleaning mechanism and a vacuum device are arranged in the space to clean the instrument panel, reduce external environmental interference, improve the clarity of the acquired image, greatly improve the accuracy and reliability of data reading, and ensure safety;

[0046] 4. Data acquisition and identification are achieved by installing the main shell on the outside of the instrument through a fixed frame. During installation, an elastic seal is used to form a closed space between the instrument panel data reading device and the instrument panel, which has a certain buffering protection effect. After the docking is completed, the collected data can be remotely acquired and the instrument data value can be read, avoiding the problems caused by manual meter reading. The work efficiency is significantly improved, and conventional cameras can be used, which greatly reduces the monitoring cost and facilitates promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0048] Figure 1 A first-view stereoscopic image of the instrument panel data reading device based on image recognition provided by the present invention;

[0049] Figure 2 A second-view stereoscopic image of the instrument panel data reading device based on image recognition provided by the present invention;

[0050] Figure 3 This is a right view of the instrument panel data reading device based on image recognition provided by the present invention;

[0051] Figure 4 A front view of the instrument panel data reading device based on image recognition provided by the present invention;

[0052] Figure 5 A top view of the instrument panel data reading device based on image recognition provided by the present invention;

[0053] Figure 6 For the present invention Figure 3 Middle AA section;

[0054] Figure 7 For the present invention Figure 4 Middle BB section;

[0055] Figure 8 For the present invention Figure 5 Middle CC section;

[0056] Fig. 9 This is a control flow chart of the automatic fill light system of the present invention;

[0057] Fig.10 This is a demonstration diagram of the mirror symmetry between the incident light and the reflected light when the present invention is used.

[0058] Among them are:

[0059] Main body shell-1; first expansion box-2; sunshade-3; second expansion box-4; drying box-5; transparent baffle-6; adjustment part-7; camera-8; LED fill light belt-9; gauze-10; sealing cover-11; light sensor-12; single chip computer-13;

[0060] Rectangular channel-101; Laminating plate-102;

[0061] Telescopic connecting rod-701; ball joint-702. DETAILED DESCRIPTION

[0062] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0063] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0064] like Figure 1-9 As shown, a dashboard data reading device based on image recognition comprises a main body shell 1, a rectangular channel 101 penetrating from front to back is provided inside the main body shell 1, and a bonding plate 102 is fixedly connected to the outer side of the front end of the main body shell 1, and an elastic sealing member is sleeved on the outer side of the bonding plate 102, and a transparent baffle 6 bonded to the inner wall of the rectangular channel 101 is provided at the rear end of the main body shell 1, so that the staff can still observe the instrument data without being blocked;

[0065] The size of the transparent baffle 6 is determined according to the inner diameter of the cross section of the main shell 1. If the camera module is still designed to be located directly opposite the instrument data display area, firstly, the staff's line of sight will be blocked. Secondly, the transparent baffle 6 will cause the external light environment to have a greater impact on the inside of the device. In the instrument panel image captured by the camera module, the instrument data display area will be disturbed by the external environment background reflected by the mirror image of the instrument panel surface, resulting in inaccurate digital recognition and difficulty in recognition. In addition, in the actual environment, the light source is mainly located in the upper hemisphere area of ​​the instrument, and the camera is located above or below and is easily affected by the light source. Therefore, the first expansion box 2 and the second expansion box 4 are respectively provided on the two side walls of the main shell 1, and the ends of the first expansion box 2 and the second expansion box 4 are both connected to the rectangular channel 101. The first expansion box 2 and the second expansion box 4 are both integrally arranged with the main shell 1. The camera module is installed on the side of the device, and the data display area of ​​the instrument is photographed in an oblique manner. The background of the obtained instrument panel image is the inner wall of the identification device reflected by the mirror image of the instrument panel surface, and the background color is uniform.

[0066] The main housing 1 is made of a darker color and a material that reduces reflection, so that when it is used as the background of the instrument digital display image, the data displayed on the instrument can be highlighted, and the light entering the device from the outside can be scattered to reduce the generation of highlight areas. Preferably, the main housing 1 is made of a black frosted acrylic plate, so that its inner wall forms a pure black background wall; this structure is corrosion-resistant and moisture-resistant, suitable for various complex environments, meets design requirements, and the cost of acrylic is low;

[0067] A desiccant filler is provided inside the first expansion box 2 to keep the internal environment of the main housing 1 dry and improve the safety of the electronic components inside the instrument identification device;

[0068] A camera module is provided inside the second expansion box 4, and the camera module includes a camera 8 which is tilted, and the tilt angle of the camera 8 can be adjusted so that the camera 8 can tilt and shoot the data display area of ​​the instrument;

[0069] The camera module also includes an adjustment bracket and an ESP32-CAM camera micro integrated development board. The camera 8 is mounted on the adjustment bracket with flexible angle adjustment, and the camera 8 is electrically connected to the ESP32-CAM camera micro integrated development board. The ESP32-CAM camera micro integrated development board is embedded in the second expansion box 4. The inner wall size of the second expansion box 4 is larger than the outer size of the camera module.

[0070] Both sides of the main housing 1 are provided with shading plates 3, which are movably mounted on the main housing 1 through an adjusting portion 7, so that the position and angle of the shading plates 3 are adjustable;

[0071] A circle of surrounding mounting groove is provided at the tail end of the inner wall of the rectangular channel 101, and an LED fill light strip 9 is embedded in the surrounding mounting groove. A circle of soft light film is arranged on the outside of the surrounding mounting groove. The width of the surrounding mounting groove should be relatively small, slightly larger than the width of the LED fill light strip 9, to ensure that it does not affect the staff's observation field of view. The depth of the surrounding mounting groove is greater than the thickness of the LED fill light strip 9. When installed, the LED fill light strip 9 is deeply buried in the bottom wall of the surrounding mounting groove to ensure that the camera 8 does not directly capture the light source. The soft light film is used to scatter the light to fill the display area of ​​the instrument. At the same time, the inner wall of the main shell 1 will not form a high-light area with strong contrast.

[0072] Specifically, the transparent baffle 6 is made of optical glass, a silicone sleeve is sleeved on the outer side of the optical glass, and the elastic sealing member is made of rubber material.

[0073] Specifically, the desiccant filler is made of color-changing silica gel desiccant, which can be recycled after drying, and the color-changing silica gel desiccant is filled in the drying box 5;

[0074] A replacement port is provided on the side wall of the first expansion box 2, and the drying box 5 enters the first expansion box 2 through the replacement port. A gauze 10 is provided between the first expansion box 2 and the rectangular channel 101. A sealing cover 11 is inserted into the replacement port, and a sealing silicone layer is provided on the outside of the sealing cover 11.

[0075] Specifically, the adjustment part 7 includes a telescopic connecting rod 701 , and ball joints 702 are installed at both ends of the telescopic connecting rod 701 , one of the ball joints 702 is bonded and fixed at the center of the sunshade 3 , and the other ball joint 702 is bonded and fixed on the main shell 1 .

[0076] Specifically, a light sensor 12 is provided at the front end of the rectangular channel 101 for sensing the light intensity of the environment in which the instrument is located. A single-chip microcomputer 13 is installed inside the main shell 1. The input and output ends of the single-chip microcomputer 13 are respectively provided with an A / D converter and a D / A converter. The light sensor 12 is electrically connected to the A / D converter, and the LED fill light strip 9 is electrically connected to the D / A converter.

[0077] A design method for a dashboard data reading device based on image recognition comprises the following steps:

[0078] S1. Plan the size of the instrument panel data reading device: According to the external dimensions of the instrument to be identified and the external dimensions of the data display area, the length, width and height of the instrument panel data reading device are designed as follows:

[0079] S11, determining the cross-sectional length of the main housing 1: measuring the distance from the side edge of the data display area to the edge of the instrument side wall that is far away, and the measured length value is α, and α is used as the length dimension of the main housing 1;

[0080] S12, determining the cross-sectional width of the main housing 1: measuring the width of the data display area, measuring the width value β, and setting a value greater than β as the width dimension of the main housing 1;

[0081] S13, determining the depth of the main housing 1 and the depth of the installation position of the camera 8 in the main housing 1: perform the following steps to obtain the required values;

[0082] S131, obtaining w1: w1 is a measured value of the horizontal distance between the camera 8 and the edge of the data display area on the side of the second expansion box 4;

[0083] S132, obtaining w2: w2 is a measured value of the horizontal distance between the inner wall of the main shell 1 on the side of the first expansion box 2 and the edge of the data display area on the side of the second expansion box 4;

[0084] S133, setting the depth of the main housing 1 to h2, and the depth of the installation position of the camera 8 in the main housing 1 to h1, where h2 and h1 also represent the height of the device body and the installation height of the camera 8 on the device body;

[0085] S134, substituting w1, w2, h1 and h2 into the following formula to determine the values ​​of h1 and h2;

[0086]

[0087] In summary, in the design of the height of the device body, the ratio w1 / w2 of w1 and w2 is proportional to the ratio h1 / h2 of h1 and h2. The values ​​of w2 and h1 are fixed. In order to make h2 as small as possible, the value of w1 needs to be as large as possible. However, it is limited by the outer dimensions of the instrument. In terms of length, the outer wall of the second expansion box 4 should coincide with the boundary of the outer wall of the instrument. In terms of width, the width of the main shell 1 should be slightly larger than the width of the digital display area, so that the instrument panel data reading device does not block the staff's line of sight of observing the instrument. In addition, considering the angle of the instrument panel reflecting the background light during shooting, the incident light and the reflected light are mirror-symmetrical, w1 / h1=w2 / h2, and the height h2 of the device is determined accordingly.

[0088] As for the installation position of the camera 8, the camera module is completely embedded in the second expansion box 4 so that it does not affect the staff's line of sight of observing the instrument; according to the performance parameters of the camera, including the focal length of the camera and the required resolution, the height h1 of the camera installation is determined so that it can just capture a clear and recognizable instrument image;

[0089] S135, assembling the instrument panel data reading device: loading the components required for the work on the main housing 1 designed according to the outer dimensions of the instrument and the outer dimensions of the data display area to form the overall structure of the instrument panel data reading device;

[0090] In addition to the components of the above-mentioned instrument panel data reading device, a wiper linkage mechanism and an air pump can also be added. The wiper linkage mechanism is installed on the outer wall of the rear end of the main shell 1. A driving mechanism is provided at the input end of the wiper linkage mechanism. The driving mechanism is a driving motor. The driving motor is used to swing the swing arm of the wiper linkage mechanism. A sweeping brush is installed at the active end of the wiper linkage mechanism. The sweeping brush is used to scrape the surface of the transparent baffle 6 to achieve automatic cleaning. The air pump is installed on the outside of the main shell 1. The input end of the air pump extends into the rectangular channel 101 through a pipe. When working, the dust inside the rectangular channel 101 is discharged, and the inside of the rectangular channel 101 is close to a vacuum state, thereby reducing the influence of foreign matter and improving the high definition of the captured image.

[0091] S2. Docking installation: Place the instrument panel data reading device outside the instrument to be monitored. The specific steps are as follows:

[0092] S21, align the bonding plate 102 so that it corresponds to the outside of the data display area;

[0093] S22, correct the position of the bonding plate 102: move the instrument panel data reading device in the length direction of the main shell 1, so that the outer wall of the main shell 1 located on the side of the second expansion box 4 coincides with the edge of the instrument side wall, and the outer wall of the main shell 1 located on the side of the first expansion box 2 coincides with the boundary of the data display area; move the instrument panel data reading device in the width direction of the main shell 1 so that the data display area is located within the frame of the main shell 1;

[0094] S23, adjusting the tilt angle of the camera 8: according to the performance parameters of the camera 8, including the focal length and resolution of the camera 8 and the installation position of the camera 8, adjusting the camera 8 so that the edge of the shooting field coincides with the edge of the data display area on the side of the second expansion box 4, and finally making the collected data display area image at the far left and close to the inner wall edge of the main housing 1;

[0095] S24, sealing the rectangular channel 101, pressing the main housing 1 so that the bonding plate 102 is tightly attached to the data display area by using the external elastic sealing member, so that a closed space is formed inside the rectangular channel 101;

[0096] S3, light and shadow effect adjustment: including the following steps:

[0097] S31, using the adjustment part 7 to change the position and inclination of the shading plate 3, according to the external lighting environment and the installation position and orientation of the instrument, when in use, adjust it to a position that can block the external strong light from directly irradiating the camera 8 and the inner wall of the main shell 1 on the side of the first expansion box 2, so that the shading plate 3 blocks the external strong light from directly irradiating the camera 8 and the inner wall of the main shell 1 on the side of the first expansion box 2, thereby enhancing the uniformity of the color of the captured instrument image and preventing it from being overexposed;

[0098] S32. Automatically adjust the brightness of the LED fill light strip 9 according to the illumination of the environment where the instrument is located, so as to achieve fill light in the confined space, enable the camera 8 to capture clear images, and enable digital recognition of the acquired images.

[0099] When using the instrument panel data reading device to collect the display area image of the instrument, the instrument panel data reading device designed according to the needs is installed on the outside of the instrument panel, and the following steps are performed:

[0100] Step 1: Capture the instrument image. The camera 8 captures the tilted image of the data display area and transmits it to the monitoring terminal via a wireless transmitter;

[0101] Step 2: Convert data and identify and read: After the computer of the monitoring terminal receives the tilted image of the data display area, it uses the tilt correction algorithm to adjust the tilted image to a front view image. The specific method refers to the Python+OpenCV library to implement the correction of the tilted image, so as to realize remote identification and read the data.

[0102] As an installation method of the instrument panel data reading device, a fixed collection method is adopted when arranging the instrument panel data reading device, as follows:

[0103] Multiple instrument panel data reading devices are matched one by one with multiple instruments, and the main housing 1 is installed on the outside of the instrument in a fixed-point manner through a fixing frame to achieve data acquisition and identification.

[0104] The present invention provides a specific embodiment to illustrate the size design method of the instrument panel data reading device, which is as follows:

[0105] After checking the national standard and the actual dimensions of the electric energy meter, it is found that the length of a general single-phase electric energy meter is 112mm and the width is 160mm. The length of a three-phase electric energy meter is generally 140-150mm and the width is about 224mm. There are no relevant regulations on the specific data display area. After measuring the general electric energy meters on the market, the data display area of ​​the single-phase electric energy meter instrument panel is 45-55mm long and 70-80mm wide. Take the length of 50mm and the width of 80mm as the calculation size. The horizontal distance between the data display area and the edge of the meter is 25mm.

[0106] For the above product, when designing the specific dimensions of the instrument panel data reading device, the main housing 1, the first expansion box 2 and the second expansion box 4 are all made of 2mm black frosted acrylic plates and bonded and fixed;

[0107] For the calculation of the installation position and angle of the camera 8, the edge of the shooting field of view is at the far left, the image of the data display area in the shooting field of view is at the far left and close to the edge of the inner wall of the main shell 1, with a length of 50mm, and the horizontal distance between the camera 8 and the edge of the data display area is 25mm, and the sum of the two is the length of the inner wall of the device 75mm. Because the main shell 1 cannot block the staff's line of sight of observing the instrument too much, the inner wall size of the main shell 1 is 75mm long and 80mm wide.

[0108] Considering the angle of the background light reflected by the dashboard during shooting, the incident light and the reflected light are mirror-symmetrical, such as Fig.10 As shown, two similar triangles are formed, so the installation height h1 of the camera 8 should be half of the device height h2. Considering that the focal length of the camera 8 is 3mm, when the resolution is set to 640×480 VGA, it is tested that h1 is 50mm and can clearly capture images that meet the recognition requirements, so the device body height h2 is 100mm; the tilt angle of the camera is 74.56°.

[0109] The second expansion box 4 is 46mm long, 26mm wide and 20mm high; it is slightly larger than the size of the camera module and does not affect the staff's observation field of view. For the sake of aesthetics, the first expansion box 2 is the same size as the second expansion box 4 and is symmetrically arranged on the left and right sides of the main shell 1. A surrounding installation groove with a width of 3mm and a depth of 10mm is arranged close to the inner wall of the main shell 1 below the transparent baffle 6. In the surrounding installation groove, a soft light film is arranged on the LED fill light strip 9 to scatter the light. A light sensor 12 is installed to automatically adjust the brightness of the LED fill light strip 9 according to the sensed light intensity to properly fill the light for the collection device.

[0110] The transparent baffle 6 has a length of 75 mm and a width of 80 mm.

[0111] In the size planning of the adjustment part 7, the diameter of the ball joint 702 should be smaller than the distance between the first expansion box 2 and the transparent baffle 6. The material, diameter, telescopic length of the telescopic connecting rod 701, and the size and material of the sunshade 3 can be selected according to the needs, and it is only necessary to consider the ball joint damping and whether the telescopic rod can bear the overall weight load of the sunshade 3. In this example, a mounting seat with a diameter of 24mm and a thickness of 1mm is installed at the end of the ball joint 702; the ball joint 702 has a diameter of 20mm and an inner diameter of 18mm; the mounting seat and the ball joint 702 are both made of hard plastic. The outer diameter of the thick tube of the telescopic connecting rod 701 is 13mm and the inner diameter is 11mm, and the outer diameter of the thin tube of the telescopic connecting rod 701 is 11mm and the inner diameter is 9mm. The length of the thick tube from the ball center of the ball joint 702 to the end face is 70mm, and the length of the thin tube from the ball center of the ball joint 702 to the end face is 75mm, and the material is aluminum alloy. The shading plate 3 is a black frosted acrylic plate with a thickness of 2 mm, a length of 100 mm, and a width of 100 mm.

[0112] The preferred embodiments of the present invention are described in detail above; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A design method for a dashboard data reading device based on image recognition, characterized in that: The reading device comprises a main body shell (1), wherein a rectangular channel (101) penetrating from front to back is provided inside the main body shell (1), and a bonding plate (102) is fixedly connected to the outside of the front end of the main body shell (1), and an elastic sealing member is sleeved on the outside of the bonding plate (102), and a transparent baffle (6) bonded to the inner wall of the rectangular channel (101) is provided at the rear end of the main body shell (1), and a first expansion box (2) and a second expansion box (4) are respectively provided on the two side walls of the main body shell (1), and the ends of the first expansion box (2) and the second expansion box (4) are both connected to the rectangular channel (101), and the first expansion box (2) and the second expansion box (4) are both integrally arranged with the main body shell (1); The main housing (1) is made of a black frosted acrylic plate, so that its inner wall forms a pure black background wall; The first expansion box (2) is provided with a desiccant filler inside, which is used to keep the internal environment of the main housing (1) dry; A camera module is provided inside the second expansion box (4), and the camera module comprises a camera (8) which is arranged tilted, and the tilt angle of the camera (8) can be adjusted so that the camera (8) can tilt and photograph the data display area of ​​the instrument; Both sides of the main housing (1) are provided with shading plates (3), and the shading plates (3) are movably mounted on the main housing (1) through an adjustment portion (7), so that the position and angle of the shading plates (3) are adjustable; The inner wall tail end of the rectangular channel (101) is provided with a circle of surrounding installation grooves, an LED fill light strip (9) is embedded in the surrounding installation grooves, and a circle of soft light film is arranged on the outer side of the surrounding installation grooves to scatter light and fill light for the display area of ​​the instrument, while the inner wall of the main housing (1) does not form a highlight area with strong contrast; The design method of the reading device comprises the following steps: S1. Plan the size of the instrument panel data reading device: According to the external dimensions of the instrument to be identified and the external dimensions of the data display area, the length, width and height of the instrument panel data reading device are designed as follows: S11, determining the cross-sectional length of the main housing (1): measuring the distance from the side edge of the data display area to the edge of the instrument side wall that is far away, and measuring the length value α, then using α as the length dimension of the main housing (1); S12, determining the cross-sectional width of the main housing (1): measuring the width of the data display area, measuring the width value β, and setting a value greater than β as the width dimension of the main housing (1); S13, determining the depth of the main housing (1) and the depth of the installation position of the camera (8) in the main housing (1): performing the following steps to obtain the required values; S131, obtaining w1: w1 is a measured value of the horizontal distance between the camera (8) and the edge of the data display area on the side of the second expansion box (4); S132, obtaining w2: w2 is a measured value of the horizontal distance between the inner wall of the main body shell (1) on the side of the first expansion box (2) and the edge of the data display area on the side of the second expansion box (4); S133, setting the depth of the main housing (1) to h2, and the depth of the installation position of the camera (8) in the main housing (1) to h1; S134, substituting w1, w2, h1 and h2 into the following formula to determine the values ​​of h1 and h2; S135, assembling the instrument panel data reading device: loading the components required for the work on the main housing (1) designed according to the outer dimensions of the instrument and the outer dimensions of the data display area to form the overall structure of the instrument panel data reading device; S2. Docking installation: Place the instrument panel data reading device outside the instrument to be monitored. The specific steps are as follows: S21, aligning the bonding plate (102) so that it corresponds to the outside of the data display area; S22, correcting the position of the bonding plate (102): moving the instrument panel data reading device in the length direction of the main housing (1) so that the outer wall of the main housing (1) located on the second expansion box (4) side coincides with the edge of the instrument side wall, and the outer wall of the main housing (1) located on the first expansion box (2) side coincides with the boundary of the data display area; moving the instrument panel data reading device in the width direction of the main housing (1) so that the data display area is located within the frame of the main housing (1); S23, adjusting the tilt angle of the camera (8): according to the performance parameters of the camera (8), including the focal length and resolution of the camera (8) and the installation position of the camera (8), adjusting the camera (8) so that the edge of its shooting field of view coincides with the edge of the data display area on the side of the second expansion box (4), and finally making the collected image of the data display area at the far left and close to the inner wall edge of the main housing (1); S24, sealing the rectangular channel (101), pressing the main housing (1) so that the bonding plate (102) is tightly bonded to the data display area using an external elastic sealing member, so that a closed space is formed inside the rectangular channel (101); S3, light and shadow effect adjustment: including the following steps: S31, using the adjustment part (7) to change the position and inclination of the shading plate (3), and according to the external lighting environment and the installation position and orientation of the instrument, adjust it to a position that can block the external strong light from directly irradiating the camera (8) and the inner wall of the main body shell (1) on the side of the first expansion box (2), so that the shading plate (3) blocks the external strong light from directly irradiating the camera (8) and the inner wall of the main body shell (1) on the side of the first expansion box (2), thereby enhancing the uniformity of the color of the captured instrument image and preventing it from being overexposed; S32, automatically adjusting the brightness of the LED fill light strip (9) according to the light intensity of the environment where the instrument is located, so as to achieve fill light in the closed space, enable the camera (8) to capture clear images, and enable digital recognition of the acquired images.

2. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized by: In S2, a fixed collection method is used when arranging the instrument panel data reading device, as follows: A plurality of instrument panel data reading devices are matched one by one with a plurality of instruments, and a main body shell (1) is installed on the outside of the instrument in a fixed-point arrangement through a fixing frame, so as to realize data acquisition and identification.

3. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized by: The transparent baffle (6) is made of optical glass, a silicone sleeve is sleeved on the outer side of the optical glass, and the elastic sealing element is made of rubber material.

4. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized in that: The desiccant filler is made of color-changing silica gel desiccant, and the color-changing silica gel desiccant is filled in the drying box (5); A replacement opening is provided on the side wall of the first expansion box (2), and the drying box (5) enters the first expansion box (2) through the replacement opening. A gauze net (10) is provided between the first expansion box (2) and the rectangular passage (101). A sealing cover (11) is inserted into the replacement opening, and a sealing silicone layer is provided on the outer side of the sealing cover (11).

5. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized in that: The adjustment part (7) comprises a telescopic connecting rod (701), and both ends of the telescopic connecting rod (701) are equipped with ball joints (702), one of the ball joints (702) is bonded and fixed at the center of the sunshade (3), and the other ball joint (702) is bonded and fixed on the main body shell (1).

6. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized in that: It also comprises a wiper linkage mechanism, which is mounted on the outer side wall of the rear end of the main body shell (1), the input end of the wiper linkage mechanism is provided with a driving mechanism, and the active end of the wiper linkage mechanism is provided with a sweeping brush for automatically cleaning the transparent baffle (6).

7. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized by: It also comprises an air pump, which is installed outside the main body shell (1), and the air pump input end extends into the rectangular channel (101) through a pipeline, so that dust inside the rectangular channel (101) is discharged when in operation, and the inside of the rectangular channel (101) is brought into a near vacuum state.

8. The design method of a dashboard data reading device based on image recognition according to claim 1 is characterized by: A light sensor (12) is arranged at the front end of the rectangular channel (101) for sensing the light intensity of the environment in which the instrument is located. A single-chip computer (13) is installed inside the main housing (1). An A / D converter and a D / A converter are arranged at the input end and the output end of the single-chip computer (13) respectively. The light sensor (12) is electrically connected to the A / D converter, and the LED fill light strip (9) is electrically connected to the D / A converter.

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