A laser measuring method and a handheld laser range finder based on laser projection

Abstract

The present application relates to a kind of laser measurement method and hand-held laser range finder based on laser projection, comprising: in the case where laser projection module is aligned with measured object, the number of regular quadrilateral corresponding to the geometric quantity to be measured of measured object is determined;The target distance between the measured object is determined by laser ranging module, and according to the linear relationship between the characteristic length of the regular quadrilateral and the target distance, the characteristic length of the corresponding regular quadrilateral under the target distance is determined;Wherein, characteristic length is used to calculate the geometric quantity to be measured of measured object;Based on the number of regular quadrilateral and characteristic length, the geometric quantity of measured object is calculated, so as to realize the geometric quantity of measured object by once measurement without relying on camera, and then the measuring efficiency can be greatly improved, the endurance of hand-held laser range finder is improved and the influence of temperature on measurement accuracy is reduced.

Description

Technical Field

[0001] This invention relates to the field of laser measurement technology, and in particular to a laser measurement method based on laser line projection and a handheld laser rangefinder. Background Technology

[0002] Traditional handheld laser rangefinders only measure the straight-line distance from the target object using a laser emitter and receiver module. Their functionality is limited, and when measuring area, they require two distance measurements, resulting in low efficiency and failing to meet current needs. To address this limitation, some handheld laser rangefinders now incorporate laser line projection capabilities. By installing a laser line projection module, they project a single-line or crosshair laser line onto the target object, providing horizontal or vertical reference lines. For example, CN217980321U discloses a laser instrument capable of line projection, point marking, and distance measurement. However, because this handheld laser rangefinder emits a single laser and obtains the straight-line distance through the reflected light signal, it cannot obtain the area of ​​the object in a single measurement, or measure the length and area of ​​a vertical / horizontal line without obstructions, resulting in low measurement efficiency.

[0003] Currently, common methods for obtaining geometric data such as the length and area of ​​a vertical / horizontal line segment through a single measurement involve adding a camera. The camera takes a picture of the object being measured, and the area is calculated using image recognition algorithms based on the camera's pixel characteristics. However, using a camera for area measurement requires extensive algorithmic calculations, resulting in high power consumption and heat generation. This reduces the battery life of small, handheld laser rangefinders and affects the accuracy of laser ranging. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a laser measurement method based on laser line projection and a handheld laser rangefinder, which solves the technical problems of low battery life and low accuracy in the prior art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, embodiments of the present invention provide a laser measurement method based on laser line projection. The laser measurement method is applied to a handheld laser rangefinder, which includes a laser ranging module and a laser line projection module. The laser line projection module is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one regular quadrilateral composed of laser rays. The laser measurement method includes:

[0009] With the laser projection module aligned with the object being measured, determine the number of regular quadrilaterals corresponding to the geometric quantities to be measured on the object.

[0010] The target distance between the laser ranging module and the object being measured is determined, and the characteristic length of the regular quadrilateral at the target distance is determined based on the linear relationship between the characteristic length of the regular quadrilateral and the target distance; wherein, the characteristic length is used to calculate the geometric quantity to be measured of the object being measured.

[0011] The geometric quantities of the object being measured are calculated based on the number and characteristic length of regular quadrilaterals.

[0012] In one possible embodiment, the handheld laser rangefinder further includes a pattern drawing function module configured to receive user input to describe a target area corresponding to the measured geometry of the object in a laser projection pattern displayed on the display screen of the handheld laser rangefinder; and to determine the number of regular quadrilaterals corresponding to the measured geometry of the object, including: determining the pattern of the target area; and determining the number of regular quadrilaterals corresponding to the measured geometry of the object based on the pattern of the target area.

[0013] In one possible embodiment, the input modes of the pattern drawing function module include a button selection mode and a touchscreen drawing mode.

[0014] In one possible embodiment, when the regular quadrilateral is a square, the expression for calculating the side length of the square is:

[0015] ;

[0016] In the formula, d n d1 represents the side length of the square at the target distance; d2 represents the side length of the square at a distance of L2 from the calibration plate; d1 represents the side length of the square at a distance of L1 from the calibration plate; L n Indicates the target distance.

[0017] In one possible embodiment, when the regular quadrilateral is a square, the expression for calculating the side length of the square is:

[0018] ;

[0019] In the formula, d n L represents the side length of the square corresponding to the target distance; m represents the number of squares in the calibration board between the side of a single square in the current laser projection pattern and the side of a single square at a distance of L1; a represents the side length of the smallest single square in the calibration board; L2 represents the distance to the calibration board when m is 2; L1 represents the distance to the calibration board when the square projected by the laser projection module is exactly aligned with a square in the calibration board; L n d1 represents the target distance; d1 represents the side length of the square corresponding to a distance of L1 from the calibration plate.

[0020] In one possible embodiment, the geometric quantities include any one of the following: the side length of a regular straight-edged object, the diagonal length, the plane angle, the area, and the length of the straight line.

[0021] In one possible embodiment, a regular quadrilateral includes any shape among rectangles, squares, trapezoids, and parallelograms.

[0022] Secondly, embodiments of the present invention provide a handheld laser rangefinder, comprising: a laser ranging module, a laser line projection module, and a control module, wherein...

[0023] The laser projection module is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one regular quadrilateral formed by laser beams.

[0024] The laser ranging module is configured to determine the target distance between itself and the object being measured.

[0025] The control module is configured to, when the laser projection module is aligned with the object under test, determine the number of regular quadrilaterals corresponding to the geometric quantities to be measured of the object under test, and determine the feature length of the regular quadrilateral at the target distance based on the linear relationship between the feature length of the regular quadrilateral and the target distance, and calculate the geometric quantities of the object under test based on the number of regular quadrilaterals and the determined feature lengths; wherein, the feature length is used to calculate the geometric quantities to be measured of the object under test.

[0026] In one possible embodiment, the handheld laser rangefinder further includes a pattern drawing function module configured to receive user input to describe a target area corresponding to the measured geometry of the object in a laser projection pattern displayed on the display screen of the handheld laser rangefinder; the control module is further configured to determine the pattern of the target area and, based on the pattern of the target area, determine the number of regular quadrilaterals corresponding to the measured geometry of the object.

[0027] In one possible embodiment, the input modes of the pattern drawing function module include a button selection mode and a touchscreen drawing mode.

[0028] (III) Beneficial Effects

[0029] The beneficial effects of this invention are:

[0030] This application provides a laser measurement method based on laser projection and a handheld laser rangefinder. Based on the linear relationship between the characteristic length of a regular quadrilateral and the distance between the object being measured and the handheld laser rangefinder, the characteristic length information of a single regular quadrilateral at the current distance is obtained. Then, the geometric quantity of the object being measured is measured using the characteristic length of the regular quadrilateral. Therefore, the geometric quantity of the object being measured can be obtained in a single measurement without relying on a camera, thereby greatly improving measurement efficiency, increasing the battery life of the handheld laser rangefinder, and reducing the impact of temperature on measurement accuracy.

[0031] In addition, when using rectangular projection, its vertical side can be used as a "cross" laser line marker or a "single" laser line marker, thus realizing the multifunctionality of the present invention.

[0032] To make the above-mentioned objectives, features and advantages to be achieved by the embodiments of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A flowchart of a laser measurement method based on laser line projection provided in an embodiment of this application is shown;

[0035] Figure 2 This illustration shows a side view of a handheld laser rangefinder projecting a laser projection pattern according to an embodiment of this application.

[0036] Figure 3 A schematic diagram of a laser projection pattern provided in an embodiment of this application is shown;

[0037] Figure 4 A structural block diagram of a handheld laser rangefinder provided in an embodiment of this application is shown. Detailed Implementation

[0038] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] This application provides a laser measurement method and a handheld laser rangefinder based on laser line projection. The laser line projection module is designed to project at least one regular quadrilateral, preferably a multi-square array structure with a central "cross" line. Furthermore, based on the linear relationship between the characteristic length of the regular quadrilateral and the distance between the object being measured and the handheld laser rangefinder, the characteristic length of a single regular quadrilateral at the current distance is obtained. Then, the geometric quantities of the object being measured are measured using the characteristic length of the regular quadrilateral. This allows for the acquisition of data such as the area of ​​the object being measured in a single measurement without relying on a camera, thereby significantly improving measurement efficiency, extending the battery life of the handheld laser rangefinder, and reducing the impact of temperature on measurement accuracy.

[0040] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0041] Please see Figure 1 , Figure 1 A flowchart of a laser measurement method based on laser line projection provided in an embodiment of this application is shown. Specifically, this laser measurement method can be applied to the control module of a handheld laser rangefinder. The handheld laser rangefinder includes a laser ranging module, a laser line projection module, and a control module. The laser line projection module is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one regular quadrilateral composed of laser rays. The laser measurement method includes:

[0042] Step S110: With the laser projection module aligned with the object being measured, determine the number of regular quadrilaterals corresponding to the geometric quantities to be measured on the object.

[0043] It should be understood that the specific structure, installation location, and laser projection method of the laser projection module can be set according to actual needs, and the embodiments of this application are not limited thereto.

[0044] Optionally, the handheld laser rangefinder includes a laser ranging module and a laser projection module disposed parallel to the laser ranging module on one end face of the handheld laser rangefinder. The laser projection module is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one square composed of laser beams. See [link to details]. Figure 2 .

[0045] It should be noted here that, for example Figure 3In the laser projection pattern shown, in practical use, its crosshairs are the same as the surrounding lines. Figure 3 The crosshairs are thickened here for ease of demonstration. Furthermore, the size of the laser projection pattern can be set according to actual needs, and this application embodiment is not limited to this.

[0046] It should also be noted here that, although Figure 2 and Figure 3 The regular quadrilateral shown in the example is a square, but those skilled in the art should understand that the specific shape of the regular quadrilateral can be set according to actual needs, and the embodiments of this application are not limited thereto.

[0047] For example, the regular quadrilateral can be any one of the four shapes: rectangle, square, trapezoid, and parallelogram.

[0048] In addition, the laser projection module may include a cylindrical mirror and a polarizing mirror, thereby enabling the projection of laser projection patterns.

[0049] In addition, in order to solve the problems that the laser projection pattern is too large (low accuracy) at a long distance and too small (insufficient coverage) at a close distance, this application can set multiple sets of grid laser projection patterns based on different distances from the object being measured, that is, different distance ranges can correspond to different grid laser projection patterns.

[0050] For example, when the target distance is ≤2m, the laser projection pattern can be a 5*5 grid; when the target distance is greater than 2 meters and less than or equal to 5 meters, the laser projection pattern can be a 3*3 grid.

[0051] It should also be understood that the specific data included in the geometric quantities can be set according to actual needs, and the embodiments of this application are not limited thereto.

[0052] Optionally, geometric quantities may include any one of the following: the side length, diagonal length, plane angle, area, and line length of a regular straight-line object.

[0053] It should also be understood that the specific process for determining the number of regular quadrilaterals corresponding to the measured geometric quantity of the object can also be set according to actual needs, and the embodiments of this application are not limited thereto.

[0054] Optionally, the handheld laser rangefinder also includes a pattern drawing function module. This module is configured to receive user input to depict a target area corresponding to the measured geometry of the object in a laser projection pattern displayed on the handheld laser rangefinder's screen; and to determine the number of regular quadrilaterals corresponding to the measured geometry of the object, including: determining the pattern of the target area; and determining the number of regular quadrilaterals corresponding to the measured geometry of the object based on the pattern of the target area. The handheld laser rangefinder may have a display screen configured to display one or more of the following: the pattern projected by the laser ranging module, the measured distance data between the handheld laser rangefinder and the object, and the characteristic length data of a single regular quadrilateral corresponding to the current distance. The characteristic length data can be a side length (e.g., length or width if it is a rectangle), a height (e.g., height if it is a parallelogram), or a diagonal (e.g., diagonal length if it is a square), etc. That is, the characteristic length data is used to calculate the measured geometry of the object.

[0055] For example, when the pattern projected by the laser projection module consists of multiple regular quadrilaterals, the user can draw it on the display screen based on the pattern drawing function module. That is, the user can draw the target area in the projected pattern that corresponds to the geometric quantity to be measured of the object according to the measurement needs. Thus, the handheld laser rangefinder can determine the number of regular quadrilaterals corresponding to the geometric quantity to be measured of the object according to the pattern of the target area, and then automatically output the geometric quantity information such as the length and area of ​​the selected part.

[0056] The pattern drawing function module is configured as a button selection mode. By moving the cursor with the same side length as the regular quadrilateral by pressing the button (i.e., moving once from the current regular quadrilateral to the next adjacent regular quadrilateral), a pattern is drawn that is aligned with the object being measured and the corresponding area data is measured. Then, the handheld laser rangefinder calculates the geometric data such as length, angle, and area based on the drawn area pattern and displays it on the screen.

[0057] The pattern drawing module is configured for touchscreen drawing mode. Users can draw a pattern on a projected pattern displayed on the screen, aligning it with the object being measured and measuring the corresponding area. A handheld laser rangefinder then calculates geometric data such as length, angle, and area based on the drawn pattern and displays it on the screen. During the touchscreen drawing mode, incorrectly drawn areas can be erased.

[0058] For example, if the geometric quantity to be measured is the area of ​​the surface to be measured of the object, and the surface to be measured of the object occupies 5 squares in the laser projection pattern projected by the laser projection module, the area of ​​the 5 squares can be described in the laser projection pattern displayed on the screen through the touch screen drawing mode. Subsequently, the area of ​​the surface to be measured of the object can be calculated based on the side length of the square corresponding to the current distance and the number of squares occupied, which is 5.

[0059] For example, if the geometric quantity to be measured is the length of a straight line, and the straight line of the object being measured occupies two squares on the horizontal line in the laser projection pattern projected by the laser projection module, the area of ​​the two squares on the horizontal line can be selected from the laser projection pattern displayed on the screen by using the button selection mode. Subsequently, the length of the straight line of the object being measured can be calculated based on the side length of the corresponding square at the current distance and the fact that the number of squares occupied is 2.

[0060] It should also be noted that this handheld laser rangefinder can be fixed to a level or used directly in the user's hand. Based on this, a feature for real-time monitoring of the device's tilt angle can be incorporated within the handheld laser rangefinder. The six-axis gyroscope, when held in the user's hand, can calculate d*cosθ after determining the characteristic length d corresponding to the target distance. The value of d can be used to correct the feature length d, and the corrected value can then be used to calculate the geometric quantities of the object being measured.

[0061] Step S120: The target distance between the laser ranging module and the object being measured is determined, and the characteristic length of the regular quadrilateral corresponding to the target distance is determined based on the linear relationship between the characteristic length of the regular quadrilateral and the target distance. This characteristic length is used to calculate the geometric quantity. For example, if the laser projection pattern includes at least one square and the geometric quantity to be measured is an area, the characteristic length is the side length of the square; if the laser projection pattern includes at least one rectangle and the geometric quantity to be measured is an area, the characteristic length is the length and width of the rectangle; if the laser projection pattern includes at least one parallelogram and the geometric quantity to be measured is an area, the characteristic length is the base and height of the parallelogram, etc.

[0062] Specifically, after determining the target distance between the object and the target, the characteristic length of the regular quadrilateral at the target distance can be determined based on the linear relationship between the characteristic length of the regular quadrilateral and the target distance. In other words, this application can determine the linear relationship between the characteristic length of the regular quadrilateral and the target distance during calibration, and after determining the target distance, substitute the target distance into the linear relationship to obtain the characteristic length of the regular quadrilateral at the target distance.

[0063] To facilitate understanding of the process of obtaining linear relationships, the following description uses the process of obtaining linear relationships related to squares as an example. The process of obtaining linear relationships related to other regular quadrilaterals is similar and will not be described in detail below.

[0064] Optionally, firstly, a standard test surface can be set, and a calibration plate composed of multiple square grids can be placed on this surface. Then, a measuring tool can be used to measure the side length of each square grid to obtain the side length 'a' of the individual square grid. The side length 'a' can be 50 mm, etc.

[0065] Subsequently, the laser rangefinder can be turned on, and by changing the distance between the handheld laser rangefinder and the standard measured surface, the square projected by the laser projection module is aligned with the square grid (one or more square grids can be aligned as needed) to obtain the current side length d1 of the square. The actual distance L1 between the laser rangefinder and the standard measured surface is obtained through the measuring instrument, and the ranging accuracy of the laser rangefinder is calibrated.

[0066] Subsequently, the handheld laser rangefinder can be moved back and forth to change the size of the square projected by the projection module, and make the square overlap with a larger or smaller square to obtain the current square side length d2. The actual distance L2 between the laser rangefinder and the standard measured surface can then be obtained, and the ranging accuracy of the laser rangefinder can be calibrated again.

[0067] Finally, the side length d of the square represented by the first standard distance measurement and the second standard distance measurement is... n The linear proportional relationship with the measured distance allows us to derive the side length d of the square corresponding to any measured distance Ln. n And the expression for calculating the side length of the square is:

[0068] ;

[0069] In the formula, d n d1 represents the side length of the square at the target distance; d2 represents the side length of the square at a distance of L2 from the calibration plate; d1 represents the side length of the square at a distance of L1 from the calibration plate; L n Indicates the target distance.

[0070] Optionally, a standard test surface can be set first, and a calibration plate composed of multiple square grids can be set on the standard test surface. Furthermore, the side length of a single square grid can be measured using a measuring tool to obtain the side length 'a' of the single square grid.

[0071] Subsequently, the handheld laser rangefinder can be turned on. By changing the distance between the laser rangefinder and the standard measured surface, the square projected by the laser projection module is aligned with the square grid, and the current side length of the square d1=a is obtained. The actual distance L1 between the laser rangefinder and the standard measured surface is obtained through the measuring instrument, and the ranging accuracy of the laser rangefinder is calibrated.

[0072] Subsequently, the laser rangefinder can be moved back and forth to change the size of the square projected by the projection module, and to make the square overlap with the currently aligned square grid with a larger square grid at the same center point, thus obtaining the side length of the current square d2 = 3a, 5a, 7a... , d m =d1+2ma, where m is the number of square grids between the current projected single square side and the square side at a distance of L1. Obtain the actual distance L2 between the laser rangefinder and the standard measured surface at this time, and recalibrate the ranging accuracy of the laser rangefinder.

[0073] Finally, the side length d of the square represented by the first standard distance measurement and the second standard distance measurement is... n The linear proportional relationship with the measured distance allows us to derive any measured distance L. n The corresponding square side length d n And the expression for calculating the side length of the square is:

[0074] ;

[0075] In the formula, d n L represents the side length of the square corresponding to the target distance; m represents the number of squares in the calibration board between the side of a single square in the current laser projection pattern and the side of a single square at a distance of L1; a represents the side length of a single square in the calibration board; L2 represents the distance to the calibration board when m is 2; L1 represents the distance to the calibration board when the square projected by the laser projection module is exactly aligned with a square in the calibration board; L n d1 represents the target distance; d1 represents the side length of the square corresponding to a distance of L1 from the calibration plate.

[0076] After obtaining the expression for calculating the side length of the square, the target distance L can be calculated. n Substituting these values ​​into the expression for calculating the side length of the square, we obtain the corresponding side length of the square at the target distance.

[0077] It should be noted that the linear relationship between the distance between the laser rangefinder and the standard measured surface and the side length of the square projected by the laser projection module specifically includes: according to the principle of light diffusion, the closer the laser rangefinder is to the standard measured surface, the smaller the area of ​​its projected square; the farther away the laser rangefinder is from the standard measured surface, the larger the area of ​​its projected square.

[0078] Step S130: Calculate the geometric quantities of the object being measured based on the number and characteristic length of the regular quadrilaterals.

[0079] Specifically, by pointing a handheld laser rangefinder at the object being measured and keeping it horizontal, the rangefinder is moved back and forth until the edge of the shape projected by the laser projection module, or a specific side of it (e.g., when projecting multiple squares), aligns with the part of the object to be measured. (For example, if the length of a side of the object needs to be measured, the edge of the projected pattern is aligned with the side to be measured, and the edge of the pattern aligned with the side to be measured is an integer multiple of a single square). Based on the number and characteristic length of the regular quadrilaterals corresponding to the current distance, geometric data such as the length and area of ​​the object can be obtained. In other words, the geometric quantities of the object can be obtained based on the mathematical formulas for calculating the geometric quantities to be measured.

[0080] When using multiple rectangular projection patterns, this application can also measure the area of ​​irregular shapes. By projecting laser lines onto the irregular shapes so that the irregular shapes are exactly covered within the laser lines, the irregular shapes are drawn on a handheld rangefinder based on the grid and position information corresponding to the irregular shapes within the laser lines. Then, the control module divides each rectangle into four triangles along its diagonal and calculates the area of ​​the irregular shapes based on the extent to which the irregular shapes cover the triangular areas.

[0081] The aforementioned method for measuring the area of ​​irregular shapes specifically includes: when the control module identifies the depicted shape as irregular, it switches to the irregular shape measurement mode, dividing each rectangle into four triangles along its diagonal. Then, based on the current distance and the size of the triangular area occupied by the edge of the irregular shape, the edge area is increased or decreased to calculate the area. Dividing the rectangle into four triangles aims to reduce errors and facilitate calculation.

[0082] Furthermore, considering that the side length of a single rectangle varies at different distances (the greater the distance, the longer the side length), and that there will be drawing errors when plotting irregular shapes, the following measures are taken: When the distance between the object being measured and the handheld laser rangefinder is within 2 meters, if the edge of the irregular shape occupies 20% to 70% of the area of ​​a single triangle, half of the area of ​​the current triangle is calculated; if it is less than 20%, the coverage area is not calculated; and if it is more than 70%, the entire area of ​​the current triangle is calculated. When the distance between the object being measured and the handheld laser rangefinder is greater than 2 meters, if the edge of the irregular shape occupies less than 10% of the area of ​​a single triangle, the coverage area is not calculated; if it is 10% to 80%, half of the area of ​​the current triangle is calculated; and if it is more than 80%, the entire area of ​​the current triangle is calculated.

[0083] Therefore, by means of the above technical solution, the embodiments of this application obtain the characteristic length information of a single regular quadrilateral at the current distance based on the linear relationship between the characteristic length of the regular quadrilateral and the distance between the object being measured and the handheld laser rangefinder. Then, the geometric quantity of the object being measured is measured by the characteristic length of the regular quadrilateral. Thus, the geometric quantity of the object being measured can be obtained in one measurement without relying on a camera, thereby greatly improving the measurement efficiency, increasing the battery life of the handheld laser rangefinder, and reducing the impact of temperature on the measurement accuracy.

[0084] It should be understood that the above-described laser measurement method based on laser line projection is merely exemplary, and those skilled in the art can make various modifications based on the above method, and the modified solutions also fall within the protection scope of this application.

[0085] Please see Figure 4 , Figure 4 A structural block diagram of a handheld laser rangefinder 400 provided in an embodiment of this application is shown. It should be understood that the handheld laser rangefinder 400 is capable of performing the various steps in the above method embodiments. The specific functions of the handheld laser rangefinder 400 can be found in the description above; detailed descriptions are omitted here to avoid repetition. The handheld laser rangefinder 400 includes at least one software function module that can be stored in a memory or embedded in the operating system (OS) of the handheld laser rangefinder 400 in the form of software or firmware. Specifically, the handheld laser rangefinder 400 includes a laser ranging module 410, a laser projection module 420, and a control module 430, wherein...

[0086] The laser projection module 420 is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one regular quadrilateral formed by laser beams.

[0087] The laser ranging module 410 is configured to determine the target distance between itself and the object being measured.

[0088] The control module 430 is configured to, when the laser projection module 420 is aligned with the object to be measured, determine the number of regular quadrilaterals corresponding to the geometric quantity to be measured of the object, and determine the feature length of the regular quadrilateral at the target distance based on the linear relationship between the feature length of the regular quadrilateral and the target distance, and calculate the geometric quantity of the object to be measured based on the number of regular quadrilaterals and the determined feature length; wherein, the feature length is used to calculate the geometric quantity to be measured of the object to be measured.

[0089] In one possible embodiment, the handheld laser rangefinder further includes a pattern drawing function module (not shown), which is configured to receive user input to describe a target area corresponding to the measured geometry of the object in a laser projection pattern displayed on the display screen of the handheld laser rangefinder; the control module 430 is further configured to determine the pattern of the target area and, based on the pattern of the target area, determine the number of regular quadrilaterals corresponding to the measured geometry of the object.

[0090] In one possible embodiment, the input modes of the pattern drawing function module include a button selection mode and a touchscreen drawing mode.

[0091] Since the apparatus described in the above embodiments of the present invention is an apparatus used to implement the methods of the above embodiments of the present invention, those skilled in the art can understand the specific structure and variations of the apparatus based on the methods described in the above embodiments of the present invention, and therefore will not be described again here. All apparatuses used in the methods of the above embodiments of the present invention fall within the scope of protection of the present invention.

[0092] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0093] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions.

[0094] It should be noted that the word "a" or "an" preceding a component does not preclude the existence of multiple such components. This invention can be implemented using hardware comprising several different components and using a suitably programmed computer. Among the listed devices, several of these devices may be embodied by the same hardware. The use of terms such as "first," "second," "third," etc., is merely for convenience and does not indicate any order. These terms can be understood as part of the component names.

[0095] Furthermore, it should be noted that in the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the technical solution should be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0097] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the invention's technical solutions and their equivalents, then the invention should also include these modifications and variations.

Claims

1. A laser measurement method based on laser line projection, characterized in that, The laser measurement method is applied to a handheld laser rangefinder, which includes a laser ranging module and a laser projection module. The laser projection module is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one regular quadrilateral formed by laser rays. The laser measurement method includes: With the laser projection module aligned with the object under test, the number of regular quadrilaterals corresponding to the geometric quantities to be measured on the object under test is determined. The laser ranging module determines the target distance between itself and the object being measured, and based on the linear relationship between the characteristic length of the regular quadrilateral and the target distance, determines the characteristic length of the regular quadrilateral corresponding to the target distance; wherein, the characteristic length is used to calculate the geometric quantity to be measured of the object being measured. Based on the number of the regular quadrilaterals and the feature length, the geometric quantities of the object under test are calculated; The handheld laser rangefinder also includes a pattern drawing function module, which is configured to receive user input to describe a target area corresponding to the measured geometry of the object in a laser projection pattern displayed on the screen of the handheld laser rangefinder; determining the number of regular quadrilaterals corresponding to the measured geometry of the object includes: Determine the pattern of the target area; Based on the pattern of the target area, determine the number of regular quadrilaterals corresponding to the geometric quantities to be measured of the object.

2. The laser measurement method according to claim 1, characterized in that, The input modes of the pattern drawing function module include button selection mode and touch screen drawing mode.

3. The laser measurement method according to any one of claims 1-2, characterized in that, When the regular quadrilateral is a square, the expression for calculating the side length of the square is: ； In the formula, d n d1 represents the side length of the square corresponding to the target distance; d2 represents the side length of the square corresponding to the distance from the calibration plate is L2; ​​d1 represents the side length of the square corresponding to the distance from the calibration plate is L1. L n This indicates the target distance.

4. The laser measurement method according to any one of claims 1-2, characterized in that, When the regular quadrilateral is a square, the expression for calculating the side length of the square is: ； In the formula, d n The value represents the side length of the square corresponding to the target distance; m represents the number of squares in the calibration board between the side of a single square in the current laser projection pattern and the side of a single square at a distance of L1; a represents the side length of the smallest single square in the calibration board; L2 represents the distance to the calibration board when m is 2; L1 represents the distance to the calibration board when the square projected by the laser projection module is exactly aligned with a square in the calibration board. L n d1 represents the target distance; d1 represents the side length of the square corresponding to a distance of L1 from the calibration plate.

5. The laser measurement method according to claim 1, characterized in that, The geometric quantities include any one of the following: the side length, diagonal length, plane angle, area, and straight line length of a regular straight-line object.

6. The laser measurement method according to claim 1, characterized in that, The regular quadrilateral includes any one of the following shapes: rectangle, square, trapezoid, and parallelogram.

7. A handheld laser rangefinder, characterized in that, include: The system comprises a laser ranging module, a laser line projection module, and a control module. The laser projection module is configured to project a laser projection pattern onto the object being measured, and the laser projection pattern includes at least one regular quadrilateral formed by laser beams. The laser ranging module is configured to determine the target distance between itself and the object being measured. The control module is configured to, when the laser projection module is aligned with the object under test, determine the number of regular quadrilaterals corresponding to the geometric quantities to be measured of the object under test, and, based on the linear relationship between the characteristic length of the regular quadrilateral and the target distance, determine the characteristic length of the regular quadrilateral corresponding to the target distance, and calculate the geometric quantities of the object under test based on the number of regular quadrilaterals and the determined characteristic length; wherein, the characteristic length is used to calculate the geometric quantities to be measured of the object under test; The handheld laser rangefinder also includes a pattern drawing function module, which is configured to receive user input to describe a target area corresponding to the measured geometric quantity of the object in a laser projection pattern displayed on the display screen of the handheld laser rangefinder; the control module is further configured to determine the pattern of the target area and, based on the pattern of the target area, determine the number of regular quadrilaterals corresponding to the measured geometric quantity of the object.

8. The handheld laser rangefinder according to claim 7, characterized in that, The input modes of the pattern drawing function module include button selection mode and touch screen drawing mode.

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