Test graphic card

Abstract

The utility model provides a test graphic card, and relates to the technical field of optics. The test graphic card comprises a center test block and an outer circular ring test block, the center test block is circular, and the outer circular ring test block surrounds and adjoins the center test block; the central test block comprises a first test area, a second test area and a third test area; the shape of the first test area is a semicircle, the circle center of the semicircle of the first test area coincides with the circle center of the central test block, and the first test area comprises equal-interval scale marks of at least one indexing value and equal-interval scale marks of at least one unit scale; each of the second test area and the third test area comprises a plurality of color blocks which are arranged in an array and are adjacent in edge, and in the second test area, any two color blocks adjacent in edge are different in color; the outer circular ring test block comprises a preset number of color blocks with adjacent edges, and the colors of the color blocks are different.

Description

Technical Field

[0001] This application relates to the field of optical technologies, and particularly to a test chart card. Background Art

[0002] Three-dimensional reconstruction technology generates high-precision three-dimensional models by collecting three-dimensional data on the surface of an object, providing an important basis for subsequent design, analysis, and simulation. Three-dimensional reconstruction devices include RGB cameras, sensors, computers, and corresponding software and algorithms. A three-dimensional reconstruction device can simultaneously acquire color images and point cloud data of a target object or scene to be collected, display them through supporting software, and can calculate the length or angle information of the target object.

[0003] Currently, when evaluating the imaging quality of a three-dimensional reconstruction device and the measurement accuracy of supporting software, generally, a calibration board with a single pattern is used to unidirectionally evaluate the imaging quality of the three-dimensional reconstruction device or the measurement accuracy of the supporting software, resulting in one-sided evaluation results and relatively low evaluation accuracy. Utility Model Content

[0004] This application provides a test chart card to solve the technical problem that in the prior art, when evaluating the imaging quality of a three-dimensional reconstruction device and the measurement accuracy of supporting software, generally, a calibration board with a single pattern is used to unidirectionally evaluate the imaging quality of the three-dimensional reconstruction device or the measurement accuracy of the supporting software, resulting in one-sided evaluation results and relatively low evaluation accuracy.

[0005] An embodiment of this application provides a test chart card, including: a central test block and an outer ring test block. The central test block is circular in shape, and the outer ring test block surrounds and is adjacent to the central test block; the central test block includes a first test area, a second test area, and a third test area;

[0006] The first test area is semicircular in shape and the center of the semi-circle of the first test area coincides with the center of the central test block, and at least one type of equally spaced scale lines with a certain scale value and at least one type of equally spaced scale lines with a certain unit scale are included in the first test area;

[0007] Both the second test area and the third test area include a plurality of color blocks arranged in an array and adjacent to each other side by side. In the second test area, any two adjacent color blocks have different colors;

[0008] The outer ring test block includes a preset number of color blocks adjacent to each other side by side, and the colors of the plurality of color blocks are all different.

[0009] In a possible design, there are multiple types of the scale values;

[0010] The scale values include a first preset scale value, a second preset scale value, and a third preset scale value;

[0011] The second preset scale value is five times the first preset scale value, and the third preset scale value is twice the second preset scale value.

[0012] In a possible design, there are multiple types of unit scales;

[0013] The unit scales include a first preset unit scale and a second preset unit scale;

[0014] The second preset unit scale is ten times the first preset unit scale;

[0015] The equally spaced scale lines of the at least one unit scale are centered at the center of the central test block and evenly distributed on the diameter of the upper semi - circle of the central test block.

[0016] In a possible design, the shape of the second test area is rectangular. The multiple color blocks contained in the second test area are rectangular and have the same size. Among any two adjacent color blocks in the second test area, one is a white block and the other is a black block.

[0017] In a possible design, the first test area is located in the upper semi - circle of the central test block;

[0018] The second test area is located in the lower semi - circle of the central test block and is adjacent to the first test area.

[0019] In a possible design, the number of color blocks contained in the third test area ranges from 20 to 36. The color blocks contained in the third test area are rectangular, have the same size, and are colored.

[0020] In a possible design, the third test area is located within the lower semi - circle of the central test block and is adjacent to the second test area.

[0021] In a possible design, the color blocks in the outer ring test block are distributed along the circumferential direction of the outer ring test block and have the same area.

[0022] In a possible design, both the central test block and the outer ring test block include a substrate and a coating provided on the substrate. The colors of the corresponding elements and the colors of other areas except the elements in the central test block and the outer ring test block are all realized through the coating;

[0023] Among them, the elements are color blocks and / or scale lines.

[0024] In a possible design, a first fixed-point identifier is set at the center of the central test block, and second fixed-point identifiers are evenly arranged on the outer edge of the outer ring test block.

[0025] The test chart provided by the embodiment of the present application includes a central test block and an outer ring test block. The central test block is circular in shape, and the outer ring test block surrounds and is adjacent to the central test block; the central test block includes a first test area, a second test area, and a third test area; the first test area is in the shape of a semi-circle and the center of the semi-circle of the first test area coincides with the center of the central test block, and at least one type of equally spaced scale lines with different graduation values and at least one type of equally spaced scale lines with unit scales are included in the first test area; both the second test area and the third test area include a plurality of color blocks arranged in an array and adjacent to each other edge by edge. In the second test area, the colors of any two adjacent color blocks are different; the outer ring test block includes a preset number of color blocks adjacent to each other edge by edge, and the colors of the plurality of color blocks are all different. Since the test chart includes a central test block and an outer ring test block, and the outer ring test block and the central test block can be regarded as concentric circles, and the central test block includes a first test area, a second test area, and a third test area, after the 3D reconstruction device scans based on the test chart, the imaging ability of the camera in the 3D reconstruction device can be evaluated based on whether the shapes of the outer ring test block and the central test block are distorted. At least one type of equally spaced scale lines with different graduation values and at least one type of equally spaced scale lines with unit scales are included in the first test area of the central test block, so the field of view angle of the 3D reconstruction device and the angle measurement accuracy in the supporting software can be evaluated based on different types of scale lines. The colors of any two adjacent color blocks in the second test area and the third test area of the central test block are different, and the outer ring test block includes a plurality of color blocks adjacent to each other edge by edge with different colors, so the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software can be evaluated based on the different color block characteristics of the second test area, the third test area, and the outer ring test block. Therefore, the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software can be comprehensively evaluated based on each test block of the test chart, and the evaluation accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0027] Figure 1 It is a schematic structural diagram of the test chart provided by the embodiment of the present application;

[0028] Figure 2Schematic cross-sectional view of a test card provided by an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100 - Test card;

[0031] 200 - Central test block; 201 - First test area; 202 - Second test area; 203 - Third test area;

[0032] 300 - Outer ring test block;

[0033] 400 - Substrate;

[0034] 500 - Coating;

[0035] 601 - First fixed point identifier; 602 - Second fixed point identifier.

[0036] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed description of the specific embodiments

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the embodiments of the present application. In the embodiments of the present application, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements, or components must have a specific orientation or be constructed and operated in a specific orientation. Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to specific circumstances.

[0038] In addition, the terms "arranged", "connected", and "fixed" should be understood in a broad sense. For example, "connected" 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 a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0039] In the description of the embodiments of the present application, the terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein. In the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplarily" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplarily" or "for example" is intended to present relevant concepts in a specific manner.

[0040] Unless otherwise specified, the term "plurality" means two or more.

[0041] To clearly understand the technical solution of the present application, the solutions of the prior art will be introduced in detail first.

[0042] The three-dimensional reconstruction device can scan a target object or scene through the integration of a camera and a sensor, obtain the RGB image of the target object or scene and the corresponding point cloud data, and display the collected data through the supporting software of the three-dimensional reconstruction device, so as to display the color image and the point cloud data, and the data measurement function in the supporting software of the three-dimensional reconstruction device can be used to measure the length, etc., to obtain the length of the target object, etc. To ensure the accuracy of the three-dimensional model collected by the three-dimensional reconstruction device, it is generally necessary to evaluate the imaging quality of the three-dimensional reconstruction device and the measurement accuracy of the supporting software through a calibration board with a specific pattern, so as to obtain the actual error of the imaging quality of the three-dimensional reconstruction device and the measurement accuracy of the supporting software. Currently, when evaluating the imaging quality of the three-dimensional reconstruction device and the measurement accuracy of the supporting software, a test chart with only a single pattern is generally used to calculate the accuracy of one measurement function in the supporting software or to evaluate the imaging quality of the three-dimensional reconstruction device, resulting in a one-sided evaluation result and a low evaluation accuracy.

[0043] To solve the above problems, the present application provides a test chart. Compared with the original single pattern, in order to comprehensively evaluate the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software, the test chart includes a central test block and an outer ring test block. Among them, in order to evaluate whether the RGB image scanned by the 3D reconstruction device is distorted, the central test block is circular and surrounded by the outer ring test block. In order to evaluate the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software, the central test block includes a first test area, a second test area, and a third test area. The first test area includes equally spaced scale lines with at least one graduation value and equally spaced scale lines with at least one unit scale. The second test area and the third test area both include a plurality of color blocks arranged in an array and adjacent to each other edge to edge. Therefore, the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software can be respectively evaluated through different test blocks in the RGB image including the central test block and the outer ring test block. Furthermore, the comprehensive evaluation of the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software can be achieved through this test chart, improving the evaluation efficiency.

[0044] The following uses specific embodiments to elaborate in detail on the technical solution of the present application and how the technical solution of the present application solves the above technical problems. These several specific embodiments below can be combined with each other. For the same or similar concepts or processes, they may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] As Figure 1 shown, the embodiment of the present application provides a test chart, specifically including a central test block 200 and an outer ring test block 300. Among them, the shape of the central test block 200 is circular, the outer ring test block 300 surrounds and is adjacent to the central test block 200, and the central test block 200 further includes a first test area 201, a second test area 202, and a third test area 203. The shape of the first test area 201 is semi-circular, and the center of the semi-circle of the first test area 201 coincides with the center of the central test block 200. Among them, the first test area 201 includes equally spaced scale lines with at least one graduation value and equally spaced scale lines with at least one unit scale. The second test area 202 and the third test area 203 both include a plurality of color blocks arranged in an array and adjacent to each other edge to edge. In the second test area 202, the colors of any two adjacent color blocks are different. The outer ring test block 300 includes a preset number of color blocks adjacent to each other edge to edge, and the colors of the plurality of color blocks are all different.

[0046] It can be understood that when using the test chart 100 to measure the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software, the test chart 100 can be placed at a preset position in the test verification space, and the 3D reconstruction device can be used for scanning to collect the color image and point cloud data of the test chart 100 in the test verification space, that is, the collected 3D model data. The color image and point cloud data of the collected test verification space are displayed through the supporting software of the 3D reconstruction device. The length or angle and color information of the test chart 100 contained in the collected test verification space can be obtained through the measurement function and RGB function in the supporting software of the 3D reconstruction device, and the obtained length or angle and color information are compared with the actual length or angle and color information of the test chart 100, so as to comprehensively evaluate the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software. During the evaluation process, the information marked on each test block of the test chart 100 is used as the actual value, the information obtained by using the measurement function in the supporting software of the 3D reconstruction device is used as the measurement value, and the difference between the measurement value and the actual value is used as the evaluation result.

[0047] Among them, the test verification space is a space for evaluating the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software based on the test chart 100, which can be a room with a length and width of not less than 4 meters and a height of not less than 2.8 meters. In this embodiment, the size of the test verification space is not limited. The 3D reconstruction device is a device that can obtain the 3D information of an object or a scene such as the test verification space containing the test chart 100, and generate a 3D model through computer processing. The supporting software of the 3D reconstruction device is a key tool for processing, analyzing, and displaying the data collected by the 3D reconstruction device to generate a 3D model. The 3D reconstruction device includes a camera, a laser scanner, etc. The camera or video camera can take photos of an object from multiple angles and use computer vision technology to reconstruct the 3D model of the object. The laser scanner is used to scan an object with a laser beam to obtain the point cloud data on the surface of the object, and then construct a 3D model. The point cloud data contains spatial coordinate information.

[0048] It can be understood that the camera in the 3D reconstruction device mentioned in this embodiment is a general term, referring to an imaging machine that can perform RGB image scanning and shooting, and can also be a video camera, etc. In this embodiment, it is not limited.

[0049] Among them, the outer ring test block 300 surrounds and is adjacent to the central test block 200, and the central test block 200 is circular. Therefore, the outer ring test block 300 and the central test block 200 can be regarded as a ring and a circle with the same center and different radii. Among them, the radius range of the central test block 200 can be from 0.5 meters to 1 meter.

[0050] Accordingly, the inner radius of the outer ring test block can be from 0.5 meters to 1 meter, and the outer radius can be from 0.7 meters to 1.2 meters.

[0051] It can be understood that in an optical imaging system, due to the imperfections of optical components or the influence of other factors during the imaging process, abnormal changes or distortions in shape or structure occur between the actual image and the ideal image. Such changes may manifest as bending, stretching, shrinking, or irregular shapes at the image edges, thereby reducing the accuracy and quality of the imaging.

[0052] Therefore, in this embodiment, the imaging ability of the camera in the three-dimensional reconstruction device can be evaluated by determining whether the circles of the outer ring test block 300 or the central test block 200 are distorted.

[0053] Specifically, place the imaging device in the three-dimensional reconstruction device at a position aligned with the center of the test chart, and perform three-dimensional scanning on the test verification space to obtain a three-dimensional model containing the test chart. Further, display the three-dimensional model containing the test chart scanned by the three-dimensional reconstruction device in the software supporting the three-dimensional reconstruction device. It is possible to observe with the naked eye whether the circle of the central test block 200 and the outer circle of the outer ring test block 300 are distorted, so as to evaluate the imaging ability of the camera in the three-dimensional reconstruction device. It is also possible to perform multi-angle diameter measurements on the central test block 200 and the outer ring test block 300 respectively through the length measurement function in the software supporting the three-dimensional reconstruction device, check whether there are significant differences in the diameters at each angle, thereby determining whether the circles of the outer ring test block 300 or the central test block 200 are distorted, and further evaluating the imaging ability of the camera in the three-dimensional reconstruction device.

[0054] Among them, the least count, also known as the scale value or the minimum scale value, refers to the value of the quantity being measured represented by the smallest grid on the scale ruler of a measuring instrument. The unit scale represents the scale line of a length unit (such as centimeter, millimeter).

[0055] Optionally, the least count in the first test area 201 may include at least one of 1 degree, 10 degrees, etc., which is not limited in this embodiment.

[0056] Optionally, the unit scale in the first test area 201 includes at least one of centimeter, millimeter, etc., which is not limited in this embodiment.

[0057] Among them, the first test area 201 is a semi-circle, and the equally spaced scale lines of at least one least count and the equally spaced scale lines of at least one unit scale are both included in the first test area 201. Exemplarily, such as Figure 1As shown, if there is an equally spaced scale line with a certain scale value, it is distributed on the semi - circumference of the first test area 201. If there are two or more equally spaced scale lines with different scale values, they can be added successively inward adjacent to the scale lines on the semi - circumference of the first test area 201, and the scale lines of each scale value do not overlap.

[0058] Among them, the first test area 201 in the central test block 200 is used to evaluate the field of view angle of the three - dimensional reconstruction device and the angle measurement accuracy in the supporting software.

[0059] It can be understood that the field of view (FoV) is a parameter describing the field of view that an optical system (such as a camera) can observe, which is the angle formed by the center point of the optical system to the outermost edge point where it can form a clear image. The vertical field of view (VFOV) is the maximum angle that the imaging device can capture in its vertical direction.

[0060] Among them, for the accuracy evaluation of the field of view angle of the camera in the three - dimensional reconstruction device, the test chart 100 can be laid flat on the ground, the three - dimensional reconstruction device can be placed vertically at the center of the circle according to the preset field of view height, and the imaging lens of the three - dimensional reconstruction device can be scanned horizontally to obtain three - dimensional field of view scan data. By displaying the three - dimensional field of view scan data through the supporting software of the three - dimensional reconstruction device, the test chart 100 in the lower edge of the three - dimensional field of view scan data can be viewed. According to the unit scale in the first test area 201, the target distance between the imaging lens of the three - dimensional reconstruction device and the maximum range seen by the imaging lens can be obtained. Since the placement height of the three - dimensional reconstruction device is known, the vertical field of view angle of the imaging lens of the three - dimensional reconstruction device can be calculated using trigonometric functions based on the target distance and the preset field of view height, and compared with the preset vertical field of view angle in the three - dimensional reconstruction device, so as to obtain the error between the measured vertical field of view angle and the preset vertical field of view angle of the imaging lens of the three - dimensional reconstruction device, and then the accuracy of the vertical field of view angle of the imaging lens of the three - dimensional reconstruction device can be evaluated.

[0061] It can be understood that the target distance is the distance between the placement position of the imaging lens and the maximum range seen by the imaging lens. The imaging lens of the three - dimensional reconstruction device can be a camera lens or the emission lens of a laser scanner, and can be placed at the preset height respectively for the measurement and evaluation of the vertical field of view angle.

[0062] Among them, for the angle measurement accuracy evaluation in the supporting software of the 3D reconstruction device, the test chart 100 can be vertically hung at the preset height position on the wall in the test and verification space. The 3D reconstruction device starts scanning facing the center of the test chart 100 at a preset distance, so as to obtain the scanning data of the test and verification space. Input the scanning data of the test and verification space into the supporting software of the 3D reconstruction device for display. Use the measurement function in the supporting software of the 3D reconstruction device to measure the first test area 201 of the test chart 100 at any angle, obtain the angle measurement value, and perform a subtraction calculation with the actual angle value in the first test area 201. Take the absolute value of the difference between the actual angle value and the angle measurement value, and divide it by the actual angle value, thereby obtaining the angle error rate. The smaller the angle error rate, the higher the measurement accuracy of the supporting software of the 3D reconstruction device; the larger the angle error rate, the lower the measurement accuracy of the supporting software of the 3D reconstruction device.

[0063] Among them, the formula for the angle error rate is

[0064]

[0065] Among them, the actual angle value is the angle marked on the first test area 201 of the test chart 100 itself as the actual angle value, and the angle value obtained by using the measurement function in the supporting software of the 3D reconstruction device is used as the angle measurement value.

[0066] Among them, the preset height is the height of the center, which can be 1.2 meters or any height that can be normally vertically hung on the wall, and is not limited in this embodiment.

[0067] Specifically, the second test area 202 and the third test area 203 respectively contain a plurality of color blocks arranged in an array and adjacent to each other side by side. The color blocks are closely arranged without gaps, and adjacent side by side means that there is a common side between two adjacent color blocks. The colors of the adjacent color blocks in the second test area 202 are different. The color blocks in the second test area 202 and the third test area 203 are all included in the central test block.

[0068] Optionally, the colors between the adjacent color blocks in the second test area 202 can be any two different colors. For example, in the second test area 202, one of any two adjacent color blocks is a white block and the other is a gray block, or other color settings can be used, and it is not limited in this embodiment.

[0069] Among them, the second test area 202 can be used to evaluate the interval error between two adjacent point clouds in the laser point cloud data according to the color blocks. The third test area 203 can be used to evaluate the imaging ability of the camera in the 3D reconstruction device according to the color blocks of different colors.

[0070] Optionally, the second test area 202 can also be used to evaluate the imaging quality of the three-dimensional reconstruction device, and the linear geometric distortion rate of the test chart 100 is calculated by using the linear geometric distortion method.

[0071] Among them, the linear geometric distortion method can be the image distortion test method provided in the ISO 17850 standard. The ISO 17850 standard, full name ISO 17850-2015, is an international standard for measuring the geometric distortion of digital cameras in the field of photography.

[0072] Specifically, the outer ring test block 300 contains a preset number of color blocks adjacent to each other side by side. The colors of the multiple color blocks can be color blocks with different gray values. The gray value of each color block is a different gray value, and the gray values in the color blocks can be set according to a preset interval. Optionally, the gray value difference between each adjacent color block can be 15, or other intervals, which are not limited in this embodiment.

[0073] Among them, the gray value represents the brightness intensity of the pixel, and its value range generally ranges from 0 to 255, where 0 represents the darkest black and 255 represents the brightest white.

[0074] Optionally, the preset number of color blocks in the outer ring test block 300 can be any number from 17 to 255, which is not limited in this embodiment.

[0075] It can be understood that the test chart 100 can be vertically hung at the position of the preset height on the wall in the test verification space, and the three-dimensional reconstruction device is placed at a preset distance and starts scanning facing the center of the test chart 100, so as to obtain the scanning data of the test verification space. The scanning data of the test verification space is input into the supporting software of the three-dimensional reconstruction device for display. The measurement function in the supporting software of the three-dimensional reconstruction device is used to obtain the gray values of at least 2 color blocks in the outer ring test block 300 of the test chart 100, and compare them with the actual gray values in the test chart 100 respectively. Calculate the gray value error between the actual gray value and the measured gray value, subtract the actual gray value from the measured gray value to obtain the gray value color difference, and take the maximum gray value color difference among the color blocks participating in the comparison as the final gray value color difference.

[0076] Optionally, the first test area 201 can be located in the lower semicircle of the central test block 200, and the second test area 202 is located in the upper semicircle of the central test block 200, adjacent to the first test area 201. The third test area 203 is located in the upper semicircle of the central test block 200, adjacent to the second test area 202.

[0077] Optionally, the test card 100 and the substrate 400 can also be detachably connected. For example, a plurality of grooves are formed on the substrate 400, and the corresponding first test area 201, second test area 202, third test area 203, and outer ring test block 300 in the test card can be correspondingly engaged with the grooves one by one.

[0078] Specifically, referring to Figure 1 As shown, the test card provided by the embodiment of the present application specifically includes a central test block 200 and an outer ring test block 300. The shape of the central test block 200 is circular, and the outer ring test block 300 surrounds and is adjacent to the central test block 200; the central test block 200 includes a first test area 201, a second test area 202, and a third test area 203; the shape of the first test area 201 is a semi-circle, and the center of the semi-circle of the first test area 201 coincides with the center of the central test block 200, and at least one type of equally spaced scale lines with a division value and at least one type of equally spaced scale lines with a unit scale are included in the first test area 201; both the second test area 202 and the third test area 203 include a plurality of color blocks arranged in an array and adjacent to each other side by side. In the second test area 202, the colors of any two adjacent color blocks are different; the outer ring test block 300 includes a preset number of color blocks adjacent to each other side by side, and the colors of the plurality of color blocks are all different. Since the test card 100 includes the central test block 200 and the outer ring test block 300, and the outer ring test block 300 and the central test block 200 can be regarded as concentric circles, and the central test block 200 includes the first test area 201, the second test area 202, and the third test area 203, after the 3D reconstruction device scans based on the test card 100, the imaging ability of the camera in the 3D reconstruction device can be evaluated based on whether the shapes of the outer ring test block 300 and the central test block 200 are distorted. At least one type of equally spaced scale lines with a division value and at least one type of equally spaced scale lines with a unit scale are included in the first test area 201 of the central test block 200, so the field of view angle of the 3D reconstruction device and the angle measurement accuracy in the supporting software can be evaluated based on different types of scale lines. The second test area 202, the third test area 203, and the outer ring test block 300 in the central test block 200 all include a plurality of color blocks adjacent to each other side by side, so the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software can be evaluated based on the different color block characteristics of the second test area 202, the third test area 203, and the outer ring test block 300. Thus, a comprehensive evaluation of the imaging quality of the 3D reconstruction device and the measurement accuracy of the supporting software can be realized based on each test block of the test card 100, improving the evaluation efficiency.

[0079] In an alternative embodiment, there are multiple division values;

[0080] The scale values include a first preset scale value, a second preset scale value, and a third preset scale value;

[0081] The second preset scale value is five times the first preset scale value, and the third preset scale value is twice the second preset scale value.

[0082] Among them, as Figure 1 shown, the first preset scale value, the second preset scale value, and the third preset scale value are included in the first test area. The equally spaced scale lines corresponding to each preset scale value are located at different positions on the adjacent circumference and inside the circumference of the central test block 200 in the first test area 201.

[0083] Exemplarily, when the first preset scale value is 1°, the second preset scale value is 5°, and further the third preset scale value is 10°.

[0084] Optionally, the first preset scale value can be any integer degree greater than or equal to 1° and less than or equal to 18°, which is not limited in this embodiment.

[0085] Specifically, since the scale values include the first preset scale value, the second preset scale value, and the third preset scale value, and the first preset scale value, the second preset scale value, and the third preset scale value increase in a multiple relationship, the angle measurement function of the software supporting the 3D reconstruction device can be evaluated for different angle corresponding accuracy levels, and further the angle measurement accuracy in the angle measurement function of the software supporting the 3D reconstruction device can be comprehensively evaluated.

[0086] In an alternative embodiment, there are multiple unit scales;

[0087] The unit scales include a first preset unit scale and a second preset unit scale;

[0088] The second preset unit scale is ten times the first preset unit scale;

[0089] The equally spaced scale lines of at least one unit scale are uniformly distributed on the diameter of the upper semi - circle of the central test block 200 with the center of the central test block 200 as the origin.

[0090] Among them, the first preset unit scale can be in millimeters or centimeters, and the second preset unit scale can be in centimeters or decimeters.

[0091] Exemplarily, when the first preset unit scale is in millimeters, the second preset unit scale is in centimeters, so there will be 9 scale lines of millimeters between every two centimeter - unit scale lines. When the first preset unit scale is in centimeters, the second preset unit scale is in decimeters, so there will be 9 scale lines of centimeters between every two decimeter - unit scale lines.

[0092] Among them, as Figure 1 shown, taking the center of the circle of the central test block 200 as the origin, the scale lines of the first preset unit scale and the scale lines of the second preset unit scale are arranged and distributed along the diameter of the upper semi-circle of the central test block 200 from the origin.

[0093] Specifically, since the unit scale includes the first preset unit scale and the second preset unit scale, and the first preset unit scale and the second preset unit scale increase in a multiple relationship, it is possible to flexibly select an appropriate unit scale for reading according to the actual measurement situation, and the readability is enhanced.

[0094] In an optional embodiment, the shape of the second test area 202 is rectangular. The multiple color blocks included in the second test area 202 are rectangular and have the same size. Among any two adjacent color blocks side by side in the second test area 202, one is a white block and the other is a black block.

[0095] Among them, as Figure 1 shown, the shape of the second test area 202 can be rectangular and is included in the central test block 200. There are two corner points connected to the circumference of the central test block. The second test area 202 is composed of multiple rectangular color blocks of the same size, and the colors of two adjacent color blocks side by side are different, one is white and the other is black.

[0096] Among them, the corner point is the vertex of the polygon. For a rectangle, it is the points at the four corners of the rectangle.

[0097] Optionally, the side length range of the color block can be from 1 cm to 5 cm. The side lengths of the color blocks can be the same length or different lengths. For example, the side length of the color block can be 1 cm * 1 cm or 1 cm * 3 cm, and it can be set according to the point cloud data emitted by the scanner in the 3D imaging device. It is not limited in this embodiment.

[0098] Among them, the sizes of the respective color blocks in the second test area 202 are the same.

[0099] It can be understood that the side length of the color block in the second test area 202 can be set to be the same as the point cloud interval emitted by the scanner in the 3D reconstruction device. Further, the point cloud data in the test verification space scan data can be displayed by using the supporting software of the 3D reconstruction device. Optionally select the point cloud data at the adjacent corner points of at least two groups of color blocks, and use the measurement function in the supporting software of the 3D reconstruction device to measure the distance between the point cloud data at the adjacent corner points, so as to obtain the measurement data of the point cloud interval, and compare it with the actual data, thereby obtaining the interval error between adjacent point clouds.

[0100] Specifically, the second test area 202 is composed of a plurality of color patches arranged regularly, and the color patches are set to be black and white alternately. Therefore, the second test area 202 has overall uniformity and high contrast, making it easy for users to observe, thereby simplifying the test process and improving the test efficiency.

[0101] In an alternative embodiment, the first test area 201 is located in the upper semi-circle of the central test block 200;

[0102] The second test area 202 is located in the lower semi-circle of the central test block 200 and is adjacent to the first test area 201.

[0103] Among them, as Figure 1 shown, the first test area 201 is semi-circular and is located in the upper semi-circle of the central test block 200. The second test area 202 is adjacent to the first test area 201 and shares the same side.

[0104] Specifically, by placing the first test area 201 in the upper semi-circle of the central test block 200, it is beneficial for users to observe and improves the user experience. Further, by placing the second test area 202 in the lower semi-circle of the first test area 201 and adjacent to the first test area 201, the layout of the test card is made compact, the size of the test card is minimized as much as possible, and it is easy to standardize.

[0105] In an alternative embodiment, the number of color patches included in the third test area 203 ranges from 20 to 36. The shapes of the color patches included in the third test area 203 are rectangles, have the same size, and are colored.

[0106] Optionally, the side length of the color patches in the third test area 203 ranges from 2 cm to 5 cm. The side lengths of the color patches can be the same length or different lengths. For example, the side length of the color patch can be 2 cm * 3 cm or 3 cm * 3 cm, and can be set according to actual needs. This embodiment does not make any limitations.

[0107] Among them, the color of the color patches in the third test area 203 is a standard color. The standard color is processed through standardization, has a clear, fixed, and repeatable color specification, and has a specific RGB value.

[0108] Optionally, the color system can be a color of different color systems such as the red color system, and can be independently set according to requirements. This embodiment does not make any limitations.

[0109] Among them, the third test area 203 can evaluate the color accuracy of the camera in the 3D reconstruction device by setting color patches of standard colors.

[0110] It can be understood that standard colors have specific RGB values. Therefore, the RGB values of each color block in the third test area 203 captured by the camera in the three-dimensional reconstruction device can be obtained and compared with the corresponding actual RGB values, and the color difference between the measured RGB value and the actual RGB value can be calculated. Based on the calculated color difference, the color accuracy of the camera in the three-dimensional reconstruction device can be evaluated.

[0111] Specifically, by setting the number of color blocks in the third test area 203 within a limited range and unifying the shape and size, the overall consistency and standardization of the third test area 203 are ensured.

[0112] In an alternative embodiment, the third test area 203 is located within the lower semi-circle of the central test block 200 and is adjacent to the second test area 202.

[0113] Among them, as Figure 1 shown, the third test area 203 is adjacent to the second test area 202 and shares the same side.

[0114] Among them, the corner points of the color blocks in the third test area 203 that are adjacent to the circumference of the central test block 200 can be connected to the circumference.

[0115] Specifically, by making the third test area 203 adjacent to the second test area 202 and the third test area 203 being located within the lower semi-circle of the central test block 200, it is ensured that both the second test area 202 and the third test area 203 are maximally contained within the central test block 200, thus making the test chart 100 have a compact layout and being easy to standardize.

[0116] In an alternative embodiment, the color blocks in the outer ring test block 300 are distributed along the circumferential direction of the outer ring test block 300 and have the same area.

[0117] Among them, as Figure 1 shown, the color blocks in the outer ring test block 300 are evenly divided according to the number of color blocks, keeping the color block area of each color block the same and being circumferentially distributed.

[0118] Among them, the azimuthal distribution is the distribution of color blocks along the circumferential direction within an annular area.

[0119] Specifically, the color blocks in the outer ring test block 300 have the same area and are evenly distributed along the circumferential direction, so that the color blocks are visually evenly distributed, improving the user's visual experience and ensuring the consistency of the test conditions.

[0120] In an alternative embodiment, both the central test block 200 and the outer ring test block 300 include a substrate 400 and a coating 500 provided on the substrate. The colors of the corresponding elements and the colors of other areas except the elements in the central test block and the outer ring test block are all achieved through the coating;

[0121] wherein the element is a color block and / or a scale line.

[0122] wherein the substrate 400 can be a rigid plastic.

[0123] wherein, as Figures 1 to 2 shown, there are other areas in the central test block 200 in addition to the preset test area. The color settings on the central test block 200 and the outer ring test block 300 of the test card 100 are achieved through the coating 500 of the corresponding color, and the other areas of the central test block 200 also use the coating 500 of the preset color. The coatings 500 of the central test block 200 and the outer ring test block 300 have the same thickness.

[0124] wherein the colors of the corresponding elements and the colors of other areas except the elements in the central test block 200 and the outer ring test block 300 can be light colors or gray.

[0125] Specifically, the central test block 200 and the outer ring test block 300 include a substrate 400 and a coating 500. Therefore, the colors of the corresponding test areas in each test block can be flexibly adjusted through the coating 500, which is convenient for personalized customization, and the elements in the central test block 200 and the outer ring test block 300 can be clearly defined, which helps users to measure and judge more accurately. And the coating 500 has a uniform thickness, so the consistency of the measurement conditions is ensured and the accuracy of the evaluation is improved.

[0126] In an alternative embodiment, a first fixed point mark 601 is provided at the center of the central test block 200, and second fixed point marks 602 are uniformly provided on the outer edge of the outer ring test block 300.

[0127] wherein the first fixed point mark 601 is a marked point located at the center of the central test block 200. The second fixed point mark 602 is a marked point located on the outer edge of the outer ring test block 300.

[0128] wherein, as Figure 1 shown, the second fixed point marks 602 can be provided on the outer edge of the outer ring test block 300 with the center as the origin, and one second fixed point mark 602 is provided every 180 degrees.

[0129] Optionally, the second fixed point marks 602 can also be set at a preset angular interval, and the preset angular interval can be an angle such as 90 degrees, which is not limited in this embodiment.

[0130] Among them, setting the fixed point identifier can be used to align the center of the imaging device of the three-dimensional reconstruction device with the fixed point identifier, which can be used as a stable reference in space. When the center of the imaging device of the three-dimensional reconstruction device is aligned with the first fixed point identifier 601, it indicates that the center points of the imaging device of the three-dimensional reconstruction device and the test chart 100 are facing each other. When the center of the imaging device of the three-dimensional reconstruction device is aligned with the second fixed point identifier 602, it indicates that the imaging device of the three-dimensional reconstruction device is offset by a preset angle relative to the center point of the test chart 100.

[0131] Specifically, by setting the first fixed point identifier 601 and the second fixed point identifier 602, it can be used to evaluate the imaging device of the three-dimensional reconstruction device from multiple angles, increasing the diversity of evaluation.

[0132] Those skilled in the art will readily conceive of other implementations of the embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The embodiments of the present application are intended to cover any variations, uses, or adaptations of the embodiments of the present application, which follow the general principles of the embodiments of the present application and include well-known common general knowledge or conventional technical means in the technical field not disclosed in the embodiments of the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the embodiments of the present application are pointed out by the following claims.

[0133] It should be understood that the embodiments of the present application are not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the embodiments of the present application is only limited by the appended claims.

Claims

1. A test chart, characterized in that: include: A central test block and an outer ring test block, wherein the central test block is circular in shape, and the outer ring test block surrounds and adjoins the central test block; the central test block includes a first test area, a second test area, and a third test area; The shape of the first test area is a semicircle, and the center of the semicircle of the first test area coincides with the center of the central test block, wherein the first test area contains at least one equally spaced scale lines of a graduation value and at least one equally spaced scale lines of a unit scale; The second test area and the third test area both include a plurality of color blocks arranged in an array and adjacent to each other edge by edge. In the second test area, the colors of any two color blocks adjacent to each other edge by edge are different. The outer ring test block includes a preset number of color blocks adjacent to each other, and the colors of the color blocks are different.

2. The test chart according to claim 1, characterized in that: The graduation values ​​are various; The graduation values ​​include a first preset graduation value, a second preset graduation value and a third preset graduation value; The second preset division value is five times the first preset division value, and the third preset division value is twice the second preset division value.

3. The test chart according to claim 1, characterized in that: The unit scale is of various types; The unit scale includes a first preset unit scale and a second preset unit scale; The second preset unit scale is ten times the first preset unit scale; The equally spaced scale lines of the at least one unit scale are uniformly distributed on the diameter of the upper semicircle of the central test block with the center of the central test block as the origin.

4. The test chart according to claim 1, characterized in that: The second test area is in the shape of a rectangle. The multiple color blocks contained in the second test area are rectangular and have the same size. Among any two color blocks that are adjacent to each other in the second test area, one is a white block and the other is a black block.

5. The test chart according to claim 1, characterized in that: The first test area is located in the upper semicircle of the central test block; The second test area is located in the lower semicircle of the central test block and is adjacent to the first test area.

6. The test chart according to claim 1, characterized in that: The number of color blocks contained in the third test area ranges from 20 to 36, and the color blocks contained in the third test area are rectangular in shape, have the same size, and are colorful.

7. The test chart according to claim 1, characterized in that: The third test area is located in the lower semicircle of the central test block and is adjacent to the second test area.

8. The test chart according to claim 1, characterized in that: The color blocks in the outer circular ring test block are distributed along the circumference of the outer circular ring test block and have the same area.

9. The test chart according to claim 1, characterized in that: The central test block and the outer ring test block both include a substrate and a coating disposed on the substrate, and the colors of the corresponding elements in the central test block and the outer ring test block and the colors of other areas except the elements are realized by the coating; Wherein, the elements are color blocks and / or scale lines.

10. The test chart according to claim 1, characterized in that: The center of the central test block is provided with a first fixed point mark, and the outer edge of the outer ring test block is evenly provided with second fixed point marks.

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