A mural spectrum and color detection device and detection method thereof

Abstract

The invention provides a mural spectrum and color detection device and a detection method thereof, comprising a base, a spectrum and color detection mechanism, a distance measuring sensor, a lifting mechanism and a horizontal moving mechanism, the lifting mechanism comprising a vertical slide rail fixedly connected to the upper end surface of the base, the vertical slide rail being connected with a first fixed block, a bracket being connected between the first fixed block and the base, the vertical slide rail being slidably connected with a vertical slider, the horizontal moving mechanism comprising a horizontal slide rail, a second fixed block being connected between the horizontal slide rail and the vertical slider, the horizontal slide rail being slidably connected with a horizontal slider, a spectrum and color detection mechanism being arranged on the upper side of the horizontal slider, the spectrum and color detection mechanism being capable of collecting the spectrum and color of the mural, the invention has high detection efficiency and is easy to detect repeatedly; on the premise of being capable of realizing accurate detection of the spectrum and color of the mural, multiple movement paths and multiple angle detections can also be realized; automatic detection can be realized, the detection result is displayed in a host computer in a graphical manner, and the detection result is accurate and intuitive.

Description

Technical Field

[0001] The present invention relates to the technical field of spectrum and color detection, and in particular to a mural spectrum and color detection device and a detection method thereof. Background Art

[0002] With the rapid development of information technology, the digitization and internationalization of cultural relics protection research has gradually been recognized by people. Expanding modern research methods has become a major trend for future development. Therefore, the research and protection of murals must also keep up with this situation. Computers and automated equipment should be used to provide powerful tools for the research and protection of murals, making the research, protection and management of murals more scientific and modern.

[0003] The collection of a large number of mural images and related data can be achieved through digital photography, scanning and other means. After the mural images enter the computer, the various scientific and historical information in the images can be marked, split, compared, counted, analyzed and studied, and can be directly stored in the mural database. Computer digital information has the advantages of no distortion in reproduction, easy dissemination, use, query and management, and has become a very good means of preserving mural information.

[0004] The precise measurement and evaluation method for mural fading is to detect the spectral reflectance of the mural and further calculate the chromaticity parameters of the mural. Therefore, the spectral reflectance and chromaticity of the mural are important technical indicators for evaluating the color of the mural. At present, there is no detection device for the spectrum and color of murals. Similar to this is the detection technology of the surface color of objects. However, compared with murals, general objects are smaller and the colors are relatively single, while murals are larger in area and the colors show brilliant colors based on painting art. Therefore, for the spectrum and color detection of large-area murals, a scanning detection device is required. Considering that murals have the characteristics of cultural relics and cannot be touched directly, and the wall surface of murals is not flat, it is necessary to ensure that the scanning is not too close to the surface of the mural. However, according to the basic principle of object color detection, the spectral detection instrument needs to be in direct contact with the inspected plane, otherwise there will be a gap between the spectral detection instrument and the inspected plane, which will cause stray light to enter and affect the measurement accuracy. Therefore, the gap needs to be controlled within the smallest possible range; at the same time, the width of the gap affects the illumination of the light source in the detection instrument to the inspected plane. When the gap cannot be kept constant, the change in the illumination of the inspected plane will cause the measured value of the spectral reflectance of the inspected plane to change, which will lead to color detection errors. Therefore, when detecting murals, it is necessary not only to solve the problem of automated color detection of large-area murals, but also to ensure the accuracy of mural color detection by gap control and optical compensation between the spectral detection instrument and the surface of the mural to be inspected. This is also the key technology for scanning mural detection.

[0005] To summarize, if a general object color detection device is used, manual operation is required, and it is difficult to accurately control the distance between the device and the mural. The workload is large, the consistency is poor, the error is large, and the parameters are difficult to obtain quickly. The automated mural spectrum and color detection device needs to further consider the characteristics of the mural, and achieve precise control and optical compensation of the device to obtain accurate measurement results.

[0006] Based on the above situation, the present invention proposes a mural spectrum and color detection device and a detection method thereof, which can effectively solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a mural spectrum and color detection device and a detection method thereof, which can solve the problems of low efficiency and poor accuracy of manual detection of mural spectrum and color, and the problem that existing spectrum detection instruments need to directly contact the tested plane during additional measurement.

[0008] To this end, the present invention adopts the following technical solutions:

[0009] A mural spectrum and color detection device comprises a base, a spectrum and color detection mechanism, a distance sensor, a lifting mechanism and a horizontal moving mechanism, wherein the distance sensor comprises a positioning distance sensor and a distance correction sensor, the measuring surface of the distance sensor faces the mural and the measuring surface of the positioning distance sensor is a first measuring plane, the measuring surface of the distance correction sensor is a second measuring plane, a plurality of the positioning distance sensors are located on the same measuring plane, the lifting mechanism comprises a vertical slide rail fixedly connected to the upper end surface of the base, the vertical slide rail is connected with a plurality of the positioning distance sensors, the vertical slide rail is slidably connected with a vertical slider, and the horizontal moving mechanism comprises a plurality of ... The invention comprises a horizontal slide rail fixedly connected to the vertical slide rail, the horizontal slide rail is slidably connected to the horizontal slide rail, the distance correction sensor is connected to the front side of the horizontal slide rail, the spectrum and color detection mechanism is connected to the horizontal slide rail, the front of the spectrum and color detection mechanism is located at the second measuring plane, the positioning distance sensor can measure the positioning distance data from the first measuring plane to the mural, the distance correction sensor can measure the distance correction data from the second measuring plane to the mural, and the spectrum and color detection mechanism can measure the spectral signal intensity reflected from the surface of the mural, so as to calculate the actual spectral reflectance of the mural surface according to the interpolation calibration method.

[0010] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0011] The base is provided with a length scale that can mark the measurement position of the mural, the upper end surface of the base is connected to the two left and right vertical slide rails, and the vertical slide rails are located on the front side of the base, the front of the base does not exceed the front of the vertical slide rails, and the rear side of the vertical slide rails is provided with two upper and lower first fixed blocks, the first fixed blocks include feet, and a detachable bracket is connected between the base and the first fixed block on the lower side.

[0012] The transmission mechanism that this vertical cam is connected with this vertical cam is that this vertical cam is located in the vertical direction of this vertical cam, and this vertical cam is located in the vertical direction of this vertical cam.

[0013] The mural spectrum and color detection device also includes a buzzer. The vertical slide rail is provided with two upper and lower limit switches on one side close to the spectrum and color detection mechanism. The limit switches include inductive proximity switches. The limit switches are located between the vertical anti-collision belts.

[0014] The horizontal slide rail is fixedly connected to the vertical slider through a second fixed block, and a horizontal driving pulley and a horizontal driven pulley are respectively provided inside the left and right sides of the horizontal slide rail, and a horizontal conveyor belt is connected between the horizontal driving pulley and the horizontal driven pulley, and the horizontal conveyor belt is located between the horizontal slider and the horizontal slide rail, and horizontal anti-collision belts are provided on both sides of the horizontal conveyor belt. A horizontal coupling is fixedly connected to the upper left side of the horizontal slide rail, and the horizontal coupling is coaxial with the horizontal driving pulley, and a horizontal driving motor is connected to the upper side of the horizontal coupling, and the horizontal driving motor includes a stepping motor, and the motor shaft of the horizontal driving motor is rotatably connected to one side of the horizontal coupling, and the horizontal driving pulley is rotatably connected to a driving shaft, and the driving shaft is rotatably connected to the other side of the horizontal coupling.

[0015] The spectrum and color detection mechanism and the distance correction sensor are fixedly connected to the front of the horizontal slider. The spectrum and color detection mechanism includes a lighting source assembly. An integrating sphere is connected to the upper side of the lighting source assembly. The lighting source assembly includes a lamp holder. A halogen tungsten lamp is connected to the lamp holder. A lens is connected to the upper side of the halogen tungsten lamp. An aperture is connected to the upper side of the lens. The integrating sphere includes a sphere. A bottom plate is connected to the front side of the integrating sphere. An opening facing the mural is provided at the center of the bottom plate. A fiber optic holder is connected to the rear side of the sphere. A fiber optic spectrometer is externally connected to the fiber optic holder through an optical fiber.

[0016] The area of ​​the bottom plate is at least twice the area of ​​the opening, so as to avoid lateral stray light from entering the sphere through the opening as much as possible.

[0017] The distance measuring sensor comprises a high-precision laser distance measuring sensor, which is provided with a measuring window, a first data interface and a second data interface, wherein the measuring window faces forward, and the positioning distance measuring sensor and the distance correction sensor are connected in series via a UART interface to realize multi-point distance measurement.

[0018] The mural spectrum and color detection device also includes a controller, a power module, a host computer and the buzzer. The controller is a Raspberry Pi and includes a data interface. The data interface includes an RS232 interface, an I / O port, a USB interface and the UART interface. The controller is connected to the fiber optic spectrometer through the RS232 interface. The controller is connected to the distance sensor through the URTA interface. The controller is connected to the vertical drive motor, the horizontal drive motor, the limit switch and the buzzer through the I / O port. The controller is connected to the power module and the host computer through the USB interface. The host computer is provided with a distance sensor threshold setting function key and displays the distance data measured by the distance sensor. The host computer is provided with open, save, zero, and calibration function keys. The host computer interface is provided with a spectrum distribution diagram, a data analysis line chart, and CIE1964 chromaticity coordinates. Figure 3 A coordinate graph and a data table, the data in the data table are CIE1964 system tristimulus values ​​and chromaticity coordinates, CIE1964 system Lab and chroma and hue angle, etc., and a selection box for reference samples and tested samples, an integration time setting box, sampling mode selection, control of spectrometer sampling and stop, and data clearing function keys are provided below the data table. The positioning distance data includes position data 1, position data 2, position data 3 and position data 4, and the distance correction data is position data 5.

[0019] The present invention also provides a detection method of a mural spectrum and color detection device, which is characterized by comprising the following steps:

[0020] a. Calibration:

[0021] Firstly, a standard white plate with known spectral reflectance is used to calibrate the spectrum and color detection device through a host computer. The spectrum and color detection device is calibrated at 0mm, 2.5mm, 5mm, 7.5mm and 10mm from the standard white plate, thereby forming five calibration data groups with different gaps.

[0022] b. Positioning:

[0023] First, the alarm threshold of the positioning and ranging sensor is set by the host computer, and the mural spectrum and color detection device is manually moved close to the mural, so that the positioning and ranging sensor measures the positioning distance data between the first measurement plane and the mural within the alarm threshold range. At this time, the buzzer alarms, and the device is moved away from the mural to a position where the alarm does not occur.

[0024] c. Initialization:

[0025] Initialize the lifting mechanism, horizontal moving mechanism, spectrum and color detection mechanism, distance measuring sensor, vertical drive motor, horizontal drive motor, photoelectric sensor and host computer, and start the halogen tungsten lamp at the same time. The light from the halogen tungsten lamp is projected into the sphere through the lens and the aperture to form a uniform illumination through diffuse reflection, and is projected onto the mural through the opening. After initialization, the vertical slider and the horizontal slider are located at the initial measurement position set by the controller program, so that the horizontal moving mechanism is located at the initial measurement position;

[0026] c. Collect data:

[0027] The sampling integration time is set through the host computer, and the sampling mode is selected as multiple sampling. The vertical drive motor is started through the controller. The vertical slider moves to drive the horizontal moving mechanism to move in the up and down directions. Every time it moves to a vertical measurement point, the horizontal drive motor is started to drive the horizontal slider to move, thereby driving the spectrum and color detection mechanism and the distance correction sensor to move in the horizontal direction and collect the spectrum and color data and distance correction data of the horizontal measurement point at the same time according to the collection interval time set by the controller. During the movement process, the spectrum and color data and distance correction data of each detection point will be collected multiple times;

[0028] d. Data processing:

[0029] The collected data is transmitted to the controller for processing. Multiple data collected at the same point are used to calculate the average spectrum and color data and average distance correction data of the point. Because the surface of the mural is not smooth, the controller will judge the collected distance correction data. If it is less than the set alarm threshold, the spectrum and color data collected at the same time are invalid and trigger an alarm. The invalid point in the spectrum and color data coordinate diagram displayed by the host computer is 0. If the invalid data does not affect the detection result, the device continues to run. The valid spectrum and color data and distance correction data are processed by the controller and transmitted to the host computer to form a spectrum and color data coordinate diagram to determine whether the spectrum and color data are qualified. If the invalid data affects the accuracy of the detection result, the alarm threshold needs to be reset according to the invalid point distance correction data, and the mobile device needs to re-measure the area.

[0030] Based on the average spectrum and color data and the average distance correction data, the host computer compares the calibration data groups of five different gaps, obtains the standard data at the gap distance through the linear interpolation algorithm, and then calculates the spectral reflectance of the plane of the mural being tested, and then calculates the CIE1964 colorimetric system (10 fields of view) tristimulus values ​​X, Y, and Z under the D65 standard light source, calculates the chromaticity coordinates x, y of the measured color, CIE1976 uniform color space L*, a*, b*, chroma Cab*, hue angle Hab and other technical indicators, and displays the test results intuitively through the host computer with a graphical interface.

[0031] e. Reset

[0032] After the lifting mechanism and the horizontal moving mechanism of the device have completely moved, the spectrum and color detection mechanism stops collecting data and waits for a reset instruction from the controller.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects: the present invention detects the spectral signal intensity reflected by the mural surface through a spectral and color detection mechanism, and calculates the actual spectral reflectance of the mural surface according to an interpolation calibration method, so that there is no need to make the detection mechanism close to the mural surface and no damage is caused to the mural surface; the operation is simple, the detection efficiency is high, the accuracy is high, and it is easy to repeat the detection; on the premise of being able to accurately detect the spectrum and color of the mural, it is also possible to realize multiple moving paths and multiple angle detection; it is easy to control, and can realize automatic detection. The detection results are displayed in a graphical form in the upper computer, and the detection results are more accurate and intuitive; the device structure is modular, easy to disassemble and assemble, and has strong site adaptability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a front view of the present invention;

[0035] Figure 2 is a side view of the present invention;

[0036] Figure 3 is a cross-sectional view of the spectrum and color detection mechanism 11A-A of the present invention;

[0037] Figure 4 is a front view of the laser ranging sensor of the present invention;

[0038] Figure 5 It is a structural block diagram of the control system of the present invention;

[0039] Figure 6 It is a schematic diagram of the graphical interface of the host computer of the present invention;

[0040] Figure 7 It is a structural diagram of the controller of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limitations on the present invention.

[0042] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0043] Refer to the accompanying drawings. The present invention provides a mural spectrum and color detection device, comprising a base 1, a spectrum and color detection mechanism 11, a distance sensor 12, a lifting mechanism 31 and a horizontal movement mechanism 32, wherein the distance sensor 12 comprises a positioning distance sensor 121 and a distance correction sensor 122, the measuring surface of the distance sensor 12 faces the mural and the measuring surface of the positioning distance sensor 121 is a first measuring plane, the measuring surface of the distance correction sensor 122 is a second measuring plane, a plurality of the positioning distance sensors 121 are located on the same measuring plane, the lifting mechanism 31 comprises a vertical slide rail 3 fixedly connected to the upper end surface of the base 1, the vertical slide rail 3 is connected with a plurality of the positioning distance sensors 121, the vertical slide rail 3 is slidably connected with a vertical slider 4, The horizontal moving mechanism 32 includes a horizontal slide rail 23 fixedly connected to the vertical slider 4, the horizontal slide rail 23 is slidably connected to a horizontal slider 26, the front side of the horizontal slider 26 is connected to the distance correction sensor 122, the horizontal slider 26 is connected to the spectrum and color detection mechanism 11, the front of the spectrum and color detection mechanism 11 is located in the second measuring plane, the positioning distance sensor 121 can measure the positioning distance data of the first measuring plane to the mural, the distance correction sensor 122 can measure the distance correction data from the second measuring plane to the mural, and the spectrum and color detection mechanism can measure the spectral signal intensity reflected by the surface of the mural, thereby calculating the actual spectral reflectance of the mural surface according to the interpolation calibration method.

[0044] The base 1 is provided with a length scale that can mark the measurement position of the mural. The upper end surface of the base 1 is connected to the left and right vertical slide rails 3, and the vertical slide rails 3 are located on the front side of the base 1. The front of the base 1 does not exceed the front of the vertical slide rails 3. The rear side of the vertical slide rail 3 is provided with two upper and lower first fixed blocks 2, and the first fixed blocks 2 include feet. A detachable bracket 17 is connected between the base 1 and the first fixed block 2 on the lower side, so that the mural spectrum and color detection device is fixed by the first fixed block 2 on the lower side. If it is necessary to fix it by the first fixed block 2 on the upper side, the bracket 17 is removed and replaced with a bracket that can connect and fix the base 1 and the first fixed block 2 on the upper side. The bracket 17 and the feet can respectively reverse the slide rail 3, so that the slide rail 3 has more application scenarios and methods.

[0045] A vertical driving pulley and a vertical driven pulley are respectively provided on the upper side and the lower side of the vertical slide rail 3, a vertical conveyor belt 16 is connected between the vertical driving pulley and the vertical driven pulley, the vertical conveyor belt 16 is located between the vertical slider 4 and the vertical slide rail 3, vertical anti-collision belts 8 are provided on both sides of the vertical conveyor belt 16, a vertical coupling 6 is fixedly connected to one side of the vertical slide rail 3, the vertical coupling 6 is coaxial with the vertical driving pulley, a vertical driving motor 5 is connected to the other side of the vertical coupling 6, the vertical driving motor 5 includes a stepping motor, and the electric The machine shaft is rotationally connected to the vertical coupling 6, and the other side of the vertical slide rail 3 is fixedly connected to a tailstock 7 coaxial with the vertical drive pulley. The vertical drive pulley is slidably connected to a steel shaft 10, and the steel shaft 10 is rotationally connected to the vertical coupling 6 through the tailstock 7 and the vertical drive pulley in turn. The tailstock 7 can determine the axis of the steel shaft 10 and make the steel shaft 10 more stable when rotating. The vertical drive motor 5 can drive the vertical coupling 6 and the steel shaft 10 to rotate, thereby driving the vertical drive pulley and the vertical conveyor belt 16, thereby lifting and lowering the vertical slider 4.

[0046] The mural spectrum and color detection device also includes a buzzer. The vertical slide rail 3 is provided with two upper and lower limit switches 9 on one side close to the spectrum and color detection mechanism 11. The limit switch 9 includes an inductive proximity switch. The limit switch 9 is located between the vertical anti-collision belts 8. If the vertical slider 4 collides with the limit switch 9 during lifting, the vertical drive motor 5 is controlled to stop, and the buzzer sounds an alarm to avoid the vertical slider 4 from colliding with the vertical anti-collision belt 8, thereby limiting the vertical slider 4 in the up and down moving directions.

[0047] The horizontal slide rail 23 is fixedly connected to the vertical slider 4 through a second fixed block 24. A horizontal driving pulley and a horizontal driven pulley are respectively provided inside the left and right sides of the horizontal slide rail 23. A horizontal conveyor belt 27 is connected between the horizontal driving pulley and the horizontal driven pulley. The horizontal conveyor belt 27 is located between the horizontal slider 26 and the horizontal slide rail 23. Horizontal anti-collision belts 28 are provided on both sides of the horizontal conveyor belt 27. A horizontal coupling 29 is fixedly connected to the upper left side of the horizontal slide rail 23. The horizontal coupling 29 is coaxial with the horizontal driving pulley. A horizontal drive motor 30 is connected to the upper side of the horizontal coupling 29, and the horizontal drive motor 30 includes a stepping motor. The motor shaft of the horizontal drive motor 30 is rotatably connected to one side of the horizontal coupling 29, and the horizontal drive pulley is rotatably connected to a drive shaft, and the drive shaft is rotatably connected to the other side of the horizontal coupling. The horizontal drive motor 30 can drive the horizontal coupling 29 to rotate, thereby driving the drive shaft and the horizontal drive pulley to rotate, thereby driving the horizontal conveyor belt 27 to move, thereby causing the horizontal slider 26 to move left and right.

[0048] The spectrum and color detection mechanism 11 and the distance correction sensor 122 are fixedly connected to the front of the horizontal slider 26. The spectrum and color detection mechanism 11 includes a lighting source assembly 33. An integrating sphere 34 is connected to the upper side of the lighting source assembly 33. The lighting source assembly 33 includes a lamp holder 331. A halogen tungsten lamp 332 is connected to the lamp holder 331. A lens 333 is connected to the upper side of the halogen tungsten lamp 332. A diaphragm 334 is connected to the upper side of the lens 333. The integrating sphere 34 includes a sphere 341. A bottom plate 342 is connected to the front side of the integrating sphere 34. The center of the bottom plate 342 is provided with an opening 36 facing the mural, and the rear side of the sphere 341 is connected with an optical fiber holder 35. The optical fiber holder 35 is externally connected to an optical fiber spectrometer through an optical fiber. The optical fiber spectrometer can receive spectral signals, and the halogen tungsten lamp 332 can emit light, so that the light passes through the lens 333 and the aperture 334 and is projected into the sphere 341 for diffuse reflection to form uniform illumination, and then is projected onto the mural through the opening 36, so as to detect the spectrum and color of the mural. The optical fiber spectrometer collects spectrum and color data through the optical fiber holder 35 and transmits the data to the host computer.

[0049] The area of ​​the bottom plate 342 is at least twice the area of ​​the opening 36 , so as to prevent lateral stray light from entering the sphere 341 through the opening 36 as much as possible.

[0050] The distance measuring sensor 12 includes a high-precision laser distance measuring sensor, which is provided with a measuring window 20, a first data interface 21 and a second data interface 22. The measuring window 20 faces forward. The positioning distance measuring sensor 121 and the distance correction sensor 122 are connected in series via a UART interface to achieve multi-point distance measurement. The distance measuring sensor 12 can emit light of a wavelength, so as to calculate the distance by calculating the time difference or phase difference between light emission and reflection. The wavelength of the distance measuring sensor 12 is outside the visible light to avoid affecting the spectrum and color detection of the mural.

[0051] The mural spectrum and color detection device also includes a controller, a power module, a host computer and the buzzer. The controller is a Raspberry Pi and includes a data interface. The data interface includes an RS232 interface, an I / O port, a USB interface and the UART interface. The controller is connected to the fiber optic spectrometer through the RS232 interface. The fiber optic spectrometer can transmit the collected spectrum and color data to the controller. The controller can process the spectrum and color data to transmit the spectrum and color data to the host computer. The controller is connected to the ranging sensor 12 through the URTA interface. The controller is connected to the vertical drive motor 5, the horizontal drive motor 30, the limit switch 9 and the buzzer through the I / O port. The controller can control the start and stop of the vertical drive motor 5 and the horizontal drive motor 30. The controller is connected to the power module and the host computer through the USB interface. The power module can provide power for the mural spectrum and color detection device. The host computer can control the movement of the lifting mechanism 31 and the horizontal moving mechanism 32. The host computer can further process the spectrum and color data and display them in a graphical interface. The host computer is provided with a ranging sensor threshold setting function key that can set the threshold of the ranging sensor 12 and display the distance data measured by the ranging sensor 12. The host computer is provided with open, save, zero, and calibration function keys. The host computer interface is provided with a spectrum distribution diagram, a data analysis line graph, and CIE1964 chromaticity coordinates. Figure 3 A coordinate graph and a data table, the data in the data table are CIE1964 system tristimulus values ​​and chromaticity coordinates, CIE1964 system Lab and chroma and hue angle, etc., and a selection box for reference samples and tested samples, an integration time setting box, sampling mode selection, control of spectrometer sampling and stop, and data clearing function keys are provided below the data table. The positioning distance data includes position data 1, position data 2, position data 3 and position data 4, and the distance correction data is position data 5. The buzzer can alarm when it detects that the distance between the mural spectrum and color detection device and the mural is less than a set threshold.

[0052] Before using the mural spectrum and color detection device, first use a standard white board with a known spectral reflectance to calibrate the spectrum and color detection device through a host computer. The spectrum and color detection device is calibrated at 0mm, 2.5mm, 5mm, 7.5mm and 10mm from the standard white board to form five calibration data groups with different gaps.

[0053] The alarm threshold of the positioning and ranging sensor 121 is set by the host computer, and the mural spectrum and color detection device is manually moved close to the mural. At this time, the positioning distance data between the positioning and ranging sensor 121 and the mural is within the alarm threshold, and the buzzer starts to alarm. Move the mural spectrum and color detection device slowly away from the mural to a position where the buzzer just stops alarming.

[0054] The lifting mechanism 31, the horizontal moving mechanism 32, the spectrum and color detection mechanism 11, the ranging sensor 12, the vertical drive motor 5, the horizontal drive motor 30, the limit switch 9 and the host computer are initialized, and the halogen tungsten lamp 332 is started at the same time. The light emitted by the halogen tungsten lamp 332 is projected into the sphere 341 through the lens 333 and the aperture 334 to form a uniform illumination, and is projected onto the mural through the opening 36. After initialization, the vertical slider 4 and the horizontal slider 26 are located at the initial measurement position set by the controller program, so that the horizontal moving mechanism 32 is located at the initial measurement position.

[0055] The sampling integration time is set by the host computer, and the sampling mode is selected as multiple sampling. The vertical drive motor 5 is started by the controller, thereby driving the vertical conveyor belt 1 to move, thereby driving the vertical slider 4 to move, thereby driving the horizontal moving mechanism 32 to reach the initial vertical detection point, and starting the horizontal drive motor 30, thereby driving the horizontal conveyor belt 27 to move, thereby driving the horizontal slider 26 to move, thereby driving the spectrum and color detection mechanism 11 and the distance correction sensor 122 to move in the horizontal direction. At this time, the fiber optic spectrometer collects the spectrum and color data of the mural through the fiber optic holder 35 and transmits the data to the host computer. The distance correction sensor 122 simultaneously collects the distance correction data of the horizontal measurement point according to the collection interval time set by the controller. During the movement, the spectrum and color data and distance correction data of each detection point will be collected multiple times.

[0056] The collected data is transmitted to the controller for processing. Multiple data collected at the same point are used to calculate the average spectrum and color data and the average distance correction data of the point. Because the surface of the mural is not necessarily a complete plane, the controller will first judge the collected distance correction data. If it is less than a given judgment threshold, the spectrum and color data collected at the same time are invalid and an alarm is triggered. If the invalid data does not affect the detection result, for example, the invalid data loss is discontinuous or the loss accounts for a very small proportion of the collection and can be ignored, the device continues to run, and the valid spectrum and color data and distance correction data are processed by the controller and transmitted to the host computer to form a coordinate graph. If the invalid data affects the accuracy of the detection result, the alarm threshold must be reset according to the invalid point distance correction data, and the device must be moved to re-measure the area.

[0057] The host computer compares the average spectrum and color data and the average distance correction data with the calibration data groups of five different gaps. For example, if the average distance correction data is 3mm, which is between 2.5mm and 5mm in the calibration data group, the standard data at the gap distance is obtained through the linear interpolation algorithm, and then the spectral reflectance of the plane of the mural under test is calculated. Then, the three stimulus values ​​X, Y, and Z of the CIE1964 colorimetry system (10 fields of view) under the D65 standard light source are obtained by calculation, and the chromaticity coordinates x and y of the measured color, the technical indicators such as L*, a*, b* of the CIE1976 uniform color space, as well as the chromaticity Cab* and the hue angle Hab of the measured color are calculated, and the detection results are intuitively displayed through the host computer in a graphical interface.

[0058] After the lifting mechanism 31 and the horizontal moving mechanism 32 of the device are completely moved, the spectrum and color detection mechanism 11 stops collecting data and waits for the reset instruction of the controller.

[0059] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use a mural spectrum and color detection device and a detection method thereof of the present invention, and can produce the positive effects recorded in the present invention.

[0060] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internally connected between two mechanisms, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0061] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. The terms "first" and "second" are also used only for simplicity of description, and do not indicate or imply relative importance.

[0062] Furthermore, in practicing the claims of the present invention, those skilled in the art can understand and effect variations to the disclosed embodiments by studying the drawings, the disclosure and the appended claims. In addition, in the claims and the specification, the words "comprise", "contain" and the like do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A mural spectrum and color detection device, characterized in that: The invention comprises a base, a spectrum and color detection mechanism, a distance sensor, a lifting mechanism and a horizontal movement mechanism, wherein the distance sensor comprises a positioning distance sensor and a distance correction sensor, the measuring surface of the distance sensor faces the mural and the measuring surface of the positioning distance sensor is a first measuring plane, the measuring surface of the distance correction sensor is a second measuring plane, a plurality of the positioning distance sensors are located on the same measuring plane, the lifting mechanism comprises a vertical slide rail fixedly connected to the upper end surface of the base, a plurality of the positioning distance sensors are connected to the vertical slide rail, a vertical slide rail is slidably connected to a vertical slider, and the horizontal movement mechanism comprises a vertical slider fixedly connected to the mural. The horizontal slide rail of the vertical slider is slidably connected to the horizontal slide rail, the distance correction sensor is connected to the front side of the horizontal slider, the spectrum and color detection mechanism is connected to the horizontal slider, the front of the spectrum and color detection mechanism is located at the second measuring plane, the positioning distance sensor can measure the positioning distance data from the first measuring plane to the mural, the distance correction sensor can measure the distance correction data from the second measuring plane to the mural, and the spectrum and color detection mechanism can measure the spectral signal intensity reflected from the surface of the mural, thereby calculating the actual spectral reflectance of the mural surface according to the interpolation calibration method.

2. A mural spectrum and color detection device as claimed in claim 1, characterized in that: The base is provided with a length scale that can mark the measurement position of the mural, the upper end surface of the base is connected to the two left and right vertical slide rails, and the vertical slide rails are located on the front side of the base, the front of the base does not exceed the front of the vertical slide rails, and the rear side of the vertical slide rails is provided with two upper and lower first fixed blocks, the first fixed blocks include feet, and a detachable bracket is connected between the base and the first fixed block on the lower side.

3. A mural spectrum and color detection device as claimed in claim 1, characterized in that: The transmission mechanism that this vertical cam is connected with this vertical cam is that this vertical cam is located in the vertical direction of this vertical cam, and this vertical cam is located in the vertical direction of this vertical cam.

4. A mural spectrum and color detection device as claimed in claim 3, characterized in that: The mural spectrum and color detection device also includes a buzzer. The vertical slide rail is provided with two upper and lower limit switches on one side close to the spectrum and color detection mechanism. The limit switches include inductive proximity switches. The limit switches are located between the vertical anti-collision belts.

5. A mural spectrum and color detection device as claimed in claim 4, characterized in that: The horizontal slide rail is fixedly connected to the vertical slider through a second fixed block, and a horizontal driving pulley and a horizontal driven pulley are respectively provided inside the left and right sides of the horizontal slide rail, and a horizontal conveyor belt is connected between the horizontal driving pulley and the horizontal driven pulley, and the horizontal conveyor belt is located between the horizontal slider and the horizontal slide rail, and horizontal anti-collision belts are provided on both sides of the horizontal conveyor belt. A horizontal coupling is fixedly connected to the upper left side of the horizontal slide rail, and the horizontal coupling is coaxial with the horizontal driving pulley, and a horizontal driving motor is connected to the upper side of the horizontal coupling, and the horizontal driving motor includes a stepping motor, and the motor shaft of the horizontal driving motor is rotatably connected to one side of the horizontal coupling, and the horizontal driving pulley is rotatably connected to a driving shaft, and the driving shaft is rotatably connected to the other side of the horizontal coupling.

6. A mural spectrum and color detection device as claimed in claim 5, characterized in that: The spectrum and color detection mechanism and the distance correction sensor are fixedly connected to the front of the horizontal slider. The spectrum and color detection mechanism includes a lighting source assembly. An integrating sphere is connected to the upper side of the lighting source assembly. The lighting source assembly includes a lamp holder. A halogen tungsten lamp is connected to the lamp holder. A lens is connected to the upper side of the halogen tungsten lamp. An aperture is connected to the upper side of the lens. The integrating sphere includes a sphere. A bottom plate is connected to the front side of the integrating sphere. An opening facing the mural is provided at the center of the bottom plate. A fiber optic holder is connected to the rear side of the sphere. A fiber optic spectrometer is externally connected to the fiber optic holder through an optical fiber.

7. A mural spectrum and color detection device as claimed in claim 6, characterized in that: The area of ​​the bottom plate is at least twice the area of ​​the opening, so as to avoid lateral stray light from entering the sphere through the opening as much as possible.

8. A mural spectrum and color detection device as claimed in claim 6, characterized in that: The distance measuring sensor comprises a high-precision laser distance measuring sensor, which is provided with a measuring window, a first data interface and a second data interface, wherein the measuring window faces forward, and the positioning distance measuring sensor and the distance correction sensor are connected in series via a UART interface to realize multi-point distance measurement.

9. A mural spectrum and color detection device as claimed in claim 8, characterized in that: The mural spectrum and color detection device also includes a controller, a power module, a host computer and the buzzer. The controller is a Raspberry Pi and includes a data interface. The data interface includes an RS232 interface, an I / O port, a USB interface and the UART interface. The controller is connected to the fiber optic spectrometer through the RS232 interface. The controller is connected to the distance sensor through the UART interface. The controller is connected to the vertical drive motor, the horizontal drive motor, the limit switch and the buzzer through the I / O port. The controller is connected to the power module and the host computer through the USB interface. The host computer is provided with a distance sensor threshold setting function key and displays the measurement The distance data measured by the distance sensor, the host computer is provided with function keys of open, save, zero and calibration, the host computer interface is provided with three coordinate graphs of spectral distribution graph, data analysis line graph and CIE1964 chromaticity coordinate graph and a data table, the data in the data table are CIE1964 system three stimulus values ​​and chromaticity coordinates, CIE1964 system Lab and chroma and hue angle, and the data table is provided with a selection box of reference sample and measured sample, an integration time setting box, sampling mode selection, control spectrometer sampling and stop, and data clearing function keys below the data table, the positioning distance data includes position data 1, position data 2, position data 3 and position data 4, and the distance correction data is position data 5.

10. A detection method based on the mural spectrum and color detection device of claim 9, characterized in that The steps include: a. Calibration: Firstly, the spectrum and color detection device is calibrated by the host computer using a standard white plate with known spectral reflectance. The spectrum and color detection device is calibrated at 0 mm, 2.5 mm, 5 mm, 7.5 mm and 10 mm from the standard white plate to form five calibration data sets with different gaps. b. Positioning: First, the alarm threshold of the positioning and ranging sensor is set by the host computer, and the mural spectrum and color detection device is manually moved close to the mural, so that the positioning and ranging sensor measures the positioning distance data between the first measurement plane and the mural within the alarm threshold range. At this time, the buzzer alarms, and the device is moved away from the mural to a position where the alarm does not occur. c. Initialization: Initialize the lifting mechanism, horizontal moving mechanism, spectrum and color detection mechanism, distance measuring sensor, vertical drive motor, horizontal drive motor, photoelectric sensor and host computer, and start the halogen tungsten lamp at the same time. The light from the halogen tungsten lamp is projected into the sphere through the lens and the aperture to form a uniform illumination through diffuse reflection, and is projected onto the mural through the opening. After initialization, the vertical slider and the horizontal slider are located at the initial measurement position set by the controller program, so that the horizontal moving mechanism is located at the initial measurement position; c. Collect data: The sampling integration time is set through the host computer, and the sampling mode is selected as multiple sampling. The vertical drive motor is started through the controller. The vertical slider moves to drive the horizontal moving mechanism to move in the up and down directions. Every time it moves to a vertical measurement point, the horizontal drive motor is started to drive the horizontal slider to move, thereby driving the spectrum and color detection mechanism and the distance correction sensor to move in the horizontal direction and collect the spectrum and color data and distance correction data of the horizontal measurement point at the same time according to the collection interval time set by the controller. During the movement process, the spectrum and color data and distance correction data of each detection point will be collected multiple times; d. Data processing: The collected data is transmitted to the controller for processing. Multiple data collected at the same point are used to calculate the average spectrum and color data and average distance correction data of the point. Because the surface of the mural is not smooth, the controller will judge the collected distance correction data. If it is less than the set alarm threshold, the spectrum and color data collected at the same time are invalid and trigger an alarm. The invalid point in the spectrum and color data coordinate diagram displayed by the host computer is 0. If the invalid data does not affect the detection result, the device continues to operate. The valid spectrum and color data and distance correction data are processed by the controller and transmitted to the host computer to form a spectrum and color data coordinate diagram to determine whether the spectrum and color data are qualified. If the invalid data affects the accuracy of the detection result, the alarm threshold needs to be reset according to the invalid point distance correction data, and the device is moved to re-measure the area that triggered the alarm. Based on the average spectrum and color data and the average distance correction data, the host computer compares the calibration data groups of five different gaps, obtains the standard data at the gap distance through the linear interpolation algorithm, and then calculates the spectral reflectance of the plane of the mural being tested, and then calculates the three stimulus values ​​X, Y, and Z of the CIE1964 color system (10-degree viewing angle) under the D65 standard light source, calculates the chromaticity coordinates x and y of the tested color, the CIE1976 uniform color space L*, a*, b*, and the chromaticity Cab* and hue angle Hab technical indicators, and displays the test results intuitively through the host computer with a graphical interface; e. Reset After the lifting mechanism and the horizontal moving mechanism of the device have completely moved, the spectrum and color detection mechanism stops collecting data and waits for a reset instruction from the controller.

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