A wall flatness measurement system and method

Abstract

The present invention discloses a wall surface flatness measurement system and method, belonging to the technical field of wall surface flatness detection. The wall surface flatness measurement system includes a marking device, a lighting device, a camera device, and a data processing device; the marking device includes a standard wall panel and a standard light strip provided on the standard wall panel; the lighting device includes a detection light strip bracket and a detection light strip provided on the detection light strip bracket; the camera device is used to obtain an image of the standard wall panel and to obtain an image of the wall surface measurement area; the data processing device is used to perform image recognition between the collected image of the wall surface measurement area and the image of the standard wall panel, and to determine whether the wall surface flatness is qualified based on a preset allowable error. Using a standard wall panel for comparative measurement effectively avoids differences in ambient light illumination caused by factors such as location and floor of each house, making it easier to determine the measurement results; the system is low in cost, occupies little space, and is suitable for indoor portable detection; and facilitates immediate data storage and traceability.

Description

Technical Field

[0001] The invention relates to a wall surface flatness measurement system and method, belonging to the technical field of wall surface flatness detection. Background Art

[0002] Wall surface flatness is a key indicator of building quality. For example, wall surface flatness can be checked with a 2-meter straightedge and a feeler gauge. Generally, the deviation of plastering should not exceed 0.4cm, and for high-end plastering, the deviation should not exceed 0.3cm. Therefore, whether it is quality monitoring during the construction process or spot checks during handover and acceptance, this indicator will affect the intrinsic quality of the house and actually affect the customer's living experience.

[0003] Therefore, as wall flatness is a mandatory measurement item, various detection devices and methods have been invented, such as direct mechanical ruler height difference measurement, laser distance measurement, and overall wall surface vertical matrix measurement and recording. However, some of these measurement methods rely on feeler gauges, which are inconvenient for information storage and quick judgment, and have low inspection efficiency. While some can achieve multi-point automatic measurement, the measurement system is complex and large, with high costs, and is also unsuitable for inspection in small residential spaces. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a wall surface flatness measurement system and method.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A wall flatness measurement system includes a marking device, a lighting device, a camera device and a data processing device;

[0006] The marking device includes a standard wall panel and a standard light strip provided on the standard wall panel;

[0007] The lighting device includes a detection light band bracket and a detection light band arranged on the detection light band bracket;

[0008] The camera device is used to obtain the image of the standard wall panel and the image of the wall measurement area;

[0009] The data processing device is used to perform image recognition between the collected image of the wall measurement area and the standard wall panel image, and to determine whether the wall flatness is qualified according to a preset allowable error.

[0010] The present invention has the following beneficial effects: A residential complex typically has thousands to tens of thousands of households, each with more than ten walls. This makes wall flatness testing a labor-intensive task. The present measurement system facilitates efficient testing, determination, and archiving. Using standard wall panels for comparative measurement effectively avoids variations in ambient illumination between houses due to factors such as location, floor level, and exposure time. The use of a single standard for each room makes measurement results easier to determine. The present measurement system is low-cost, takes up little space, and is suitable for portable indoor testing. It also facilitates immediate data storage and traceability.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the surface of the standard wallboard is made of the same material and coating thickness as the wall surface to be tested.

[0013] The beneficial effect of adopting the above further solution is to reduce the influence of other factors in the subsequent comparison process and improve the accuracy of the comparison and judgment between the measured image and the standard image of the measurement area.

[0014] Furthermore, the detection light tape bracket includes a detection light tape mounting seat and a wall plate, the detection light tape is arranged on the detection light tape mounting seat, and the detection light tape mounting seat is connected to the upper end of the wall plate.

[0015] The beneficial effect of adopting the above further solution is that when measuring the wall, the wall board is attached to the wall to be measured to meet the lighting requirements of the area to be measured by the detection light band. By positioning with the wall board, the positioning consistency of the detection light band and the wall to be measured is better.

[0016] Furthermore, the angle between the detection light strip mounting base and the vertical plane where the wall plate is located is 30-80 degrees.

[0017] The beneficial effect of adopting the above further solution is that the lighting angle can be adjusted according to the actual measurement effect, so as to form a clear contrast between dark light and bright light according to the unevenness of the wall surface, so as to facilitate image recognition.

[0018] Furthermore, the horizontal distance between the detection light band and the wall to be detected is 5-20 centimeters.

[0019] The beneficial effect of adopting the above further solution is that by using light relatively close to the wall, the difference in brightness and darkness of the light spots formed by the concave and convex parts of the wall can be made clearer.

[0020] Furthermore, the detection light band bracket also includes a lifting rod provided at the lower end of the wall plate, and the lifting rod is hinged to the wall plate.

[0021] The beneficial effect of adopting the above further solution is that the lifting rod can meet the requirements of different heights of the wall panels, making the detection of each measurement area more convenient and quick.

[0022] The present invention also relates to a wall surface flatness measurement method, comprising the wall surface flatness measurement system as described above, and the measurement steps are as follows:

[0023] S1. The standard light strip is turned on by the calibration device, and the camera device is kept at a set distance A from the standard wall panel to obtain a standard image and upload it to the data processing device as a standard picture;

[0024] S2. Divide the wall surface to be measured into a plurality of measurement areas, namely a first measurement area, a second measurement area, ..., an nth measurement area, where n is an integer greater than 1;

[0025] S3. Place the lighting device on one side of the measurement area, maintaining the same distance between the detection light band and the measurement area and the same angle of incidence of the light as the distance between the standard light band and the standard wallboard; maintain the distance between the camera device and the measurement area equal to A, acquire a measurement image, and upload it to the data processing device as a measurement picture;

[0026] S4, the data processing device compares the standard image with the measurement image, i.e., image recognition, and determines whether it is qualified or unqualified based on the deviation;

[0027] S5. Repeat the above steps S3 and S4 in sequence until the wall to be tested is detected.

[0028] The measurement method of the present invention uses standard wall panels for comparative measurement, avoiding differences in ambient light intensity in different houses due to factors such as location, floor, and lighting time. The use of one standard for one room makes it easier to judge the measurement results. The above measurement method is simple to operate, low in cost, and suitable for indoor portable testing. It also facilitates the immediate storage of measurement data for subsequent tracing.

[0029] Furthermore, the method further includes step S6, wherein the data processing device performs a comprehensive judgment on the measurement results of each measurement area to determine the quality index of the flatness of the entire wall surface.

[0030] The beneficial effect of adopting the above further solution is that the measurement results of each measurement area are summarized to make a comprehensive assessment of the quality of the measured wall surface flatness.

[0031] Furthermore, the size of the measurement area is adapted to the size of the standard wallboard.

[0032] The beneficial effect of adopting the above further solution is to avoid the influence of the measurement result of the wall flatness of the measurement area due to the difference in size between the measurement area and the standard wall panel.

[0033] Furthermore, a comparison test is performed after step S1, and when a systematic error occurs between the debugging image and the standard image, an offset correction is performed.

[0034] The beneficial effect of this further solution is that by comparing a trial wall image with a standard image, the pass / fail threshold can be adjusted, facilitating accurate determination during the actual measurement. If environmental factors cause the data processing device's determination to differ from the actual result, the comparison threshold can be adjusted before the actual measurement is performed, area by area. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of the lighting device of the present invention;

[0036] Figure 2 This is a schematic structural diagram of the lighting device of the present invention in a measuring state;

[0037] Figure 3 It is a structural schematic diagram of the benchmarking device of the present invention;

[0038] Figure 4 It is a left-side structural schematic diagram of the marking device of the present invention;

[0039] Figure 5 Schematic diagram of the partition structure of the wall to be tested according to the present invention;

[0040] Figure 6 is a principle block diagram of the data processing device of the present invention;

[0041] Figure 7 This is a flow chart of the wall flatness measurement method of the present invention;

[0042] Figure 8 Schematic diagram of the light and dark changes in the standard image and the measured image.

[0043] In the figure, 1. Marking device; 11. Standard light strip; 12. Standard wall panel; 2. Lighting device; 21. Detection light strip; 22. Detection light strip mounting base; 23. Wall panel; 24. Lifting rod; 25. Handle; 3. Camera device; 4. Wall to be measured. DETAILED DESCRIPTION

[0044] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0045] like Figures 1-6 As shown, a wall flatness measurement system includes a marking device 1, a lighting device 2, a camera device 3 and a data processing device;

[0046] The marking device 1 includes a standard wall panel 12 and a standard light strip 11 provided on the standard wall panel 12;

[0047] The lighting device 2 includes a detection light band bracket and a detection light band 21 provided on the detection light band bracket;

[0048] The camera device 3 is used to obtain the image of the standard wall panel and the image of the wall measurement area;

[0049] The data processing device is used to perform image recognition between the collected image of the wall measurement area and the standard wall panel image, and to determine whether the wall flatness is qualified according to a preset allowable error.

[0050] The unit illumination of the standard light band 11 and the detection light band 21 is equal.

[0051] For more accurate measurements, select a darker light environment, such as indoors at night.

[0052] The surface of the standard wallboard 12 is made of the same material and coating thickness as the wall surface 4 to be measured, thereby reducing the influence of other factors in the subsequent comparison process and improving the accuracy of the comparison between the wall surface measurement area image and the standard image.

[0053] The detection light strip 21 is arranged on the detection light strip bracket to realize the installation of the detection light strip 21 , and the detection light strip bracket can meet the positioning position consistency requirement between the detection light strip 21 and the wall surface 4 to be measured.

[0054] The detection light strip bracket includes a detection light strip mounting base 22 and a wall plate 23. The detection light strip 21 is mounted on the detection light strip mounting base 22, which is connected to the upper end of the wall plate 23. When measuring a wall, the wall plate 23 is attached to the wall 4 to be measured to meet the lighting requirements of the area to be measured by the detection light strip 21. The wall plate 23 is used for positioning, and the detection light strip 21 and the wall 4 to be measured are more consistently positioned.

[0055] The angle α between the detection light strip mounting base 22 and the vertical plane of the wall plate 23 is 30-80 degrees. The lighting angle can be adjusted according to the actual measurement effect to form a clear contrast between dark light and bright light according to the concave and convex surface of the wall, so as to facilitate image recognition.

[0056] The horizontal distance between the detection light band 21 and the wall 4 to be detected is 5-20 cm. Using light closer to the wall can make the light spot difference formed by the concave and convex of the wall clearer.

[0057] During actual measurement, the included angle α between the detection light strip mounting base 22 and the vertical plane where the wall plate 23 is located is 55 degrees, and the horizontal distance between the detection light strip 21 and the wall surface 4 to be measured is 14 centimeters.

[0058] The detection light strip support also includes a lifting rod 24 provided at the lower end of the wall plate 23. The lifting rod 24 is hinged to the wall plate 23 with damping. The lifting rod 24 can meet the requirements of different heights of the wall plate 23, making the detection of each measurement area more convenient and quick.

[0059] The free end of the lifting rod 24 is further provided with a handle 25 .

[0060] like Figures 1-8 As shown, the present invention also relates to a wall surface flatness measurement method, including the wall surface flatness measurement system as described above, and the measurement steps are as follows:

[0061] S1. The marking device 1 turns on the standard light strip 11, keeps the camera device 3 at a set distance A from the standard wall panel 12, obtains a standard image and uploads it to the data processing device as a standard image Po;

[0062] S2. Divide the wall surface 4 to be measured into a plurality of measurement areas, namely a first measurement area, a second measurement area, ..., an nth measurement area, where n is an integer greater than 1;

[0063] S3. Place the lighting device 2 on one side of the measurement area, keeping the distance between the detection light strip 21 and the measurement area and the light incident angle the same as the distance between the standard light strip 11 and the standard wall panel 12 and the light incident angle; keep the distance between the camera device 3 and the measurement area equal to A, acquire a measurement image, and upload it to the data processing device as the measurement picture Pn;

[0064] S4, the data processing device compares the standard image with the measurement image, i.e., image recognition, and determines whether it is qualified or unqualified based on the deviation;

[0065] S5. Repeat the above steps S3 and S4 in sequence until the detection of the wall surface 4 to be tested is completed.

[0066] For the convenience of operation, the operation is generally performed from the first measurement area, the second measurement area ... the nth measurement area in sequence.

[0067] like Figure 5 As shown, the wall surface 4 to be measured is divided into 6 measurement areas, namely a first measurement area, a second measurement area, a third measurement area, a fourth measurement area, a fifth measurement area and a sixth measurement area.

[0068] The method further includes step S6, wherein the data processing device comprehensively judges the measurement results of each measurement area to determine the quality index of the flatness of the entire wall surface. The measurement results of each measurement area are summarized to make a comprehensive assessment of the quality of the measured wall surface flatness.

[0069] The size of the measurement area is adapted to the size of the standard wall panel 12 , so as to avoid the difference in size between the measurement area and the standard wall panel 12 affecting the measurement result of the wall surface flatness of the measurement area.

[0070] After step S1, a comparative test is performed. If a systematic error is detected between the test image and the standard image, an offset correction is performed. Specifically, a visually flawless wall surface is selected to form a test image. This image is then compared with the standard image. If significant deviations are found, adjustments can be made to eliminate the deviations, thereby eliminating systematic errors. Specifically, a trial wall image is compared with the standard image to adjust the pass / fail threshold, facilitating accurate determination during the formal measurement. If environmental factors cause the data processing device's determination to differ from the actual result, the comparison threshold can be adjusted before formal measurements are taken area by area.

[0071] The present invention adopts the standard wall panel 12 for comparative measurement, which avoids the difference in ambient light intensity caused by factors such as location, floor, and illumination time in each house, and adopts one room for one standard, so that the measurement result judgment standard is more unified; Figure 8 As shown in the figure, the left image is the standard image Po, and the right image is the measured image Pn. Compared with the standard image Po, the measured image Pn contains shadows. The shadow area is calculated as the proportion of the entire measurement area. If it exceeds the set threshold, the wall flatness of the corresponding measurement area is determined to be defective and the wall flatness of the measurement area is unqualified. The above measurement process is simple to operate, low-cost, and suitable for indoor portable testing. It also facilitates the immediate storage of measurement data for subsequent traceability.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for measuring wall flatness, characterized in that: The invention comprises a wall surface flatness measurement system, wherein the wall surface flatness measurement system comprises a marking device (1), a lighting device (2), a camera device (3) and a data processing device; the marking device (1) comprises a standard wall panel (12) and a standard light strip (11) arranged on the standard wall panel (12); the lighting device (2) comprises a detection light strip bracket and a detection light strip (21) arranged on the detection light strip bracket; The camera device (3) is used to obtain images of standard wall panels and images of wall surface measurement areas; The data processing device is used to perform image recognition between the collected image of the wall surface measurement area and the image of the standard wall panel, and determine whether the wall surface flatness is qualified according to a preset allowable error; The detection light band bracket comprises a detection light band mounting seat (22) and a wall plate (23), wherein the detection light band (21) is arranged on the detection light band mounting seat (22), and the detection light band mounting seat (22) is connected to the upper end of the wall plate (23); the angle between the detection light band mounting seat (22) and the vertical plane where the wall plate (23) is located is 30-80 degrees; The measurement steps are as follows: S1, the standard light strip (11) is turned on by the marking device (1), the camera device (3) is kept at a set distance A from the standard wall panel (12), a standard image is obtained and uploaded to the data processing device as a standard image; S2, dividing the wall surface (4) to be measured into a plurality of measurement areas, namely a first measurement area, a second measurement area, ... an nth measurement area, where n is an integer greater than 1; S3, placing the lighting device (2) on one side of the measurement area, keeping the distance between the detection light band (21) and the measurement area and the light incident angle the same as the distance between the standard light band (11) and the standard wall panel (12) and the light incident angle; keeping the distance between the camera device (3) and the measurement area equal to A, acquiring a measurement image, and uploading it to the data processing device as a measurement picture; S4, the data processing device compares the standard image with the measurement image, i.e., image recognition, and determines whether it is qualified or unqualified based on the deviation; S5. Repeat the above steps S3 and S4 in sequence until the wall to be tested is detected.

2. The wall surface flatness measurement method according to claim 1, characterized in that: The surface of the standard wallboard (12) is made of the same material and coating thickness as the wall surface (4) to be tested.

3. The wall surface flatness measurement method according to claim 1, characterized in that: The horizontal distance between the detection light band (21) and the wall surface (4) to be detected is 5-20 centimeters.

4. The wall surface flatness measurement method according to claim 1, characterized in that: The detection light band bracket further comprises a lifting rod (24) provided at the lower end of the wall-mounted plate (23), and the lifting rod (24) is hinged to the wall-mounted plate (23).

5. The wall surface flatness measurement method according to any one of claims 1 to 4, characterized in that: The method further includes step S6, wherein the data processing device performs comprehensive judgment on the measurement results of each measurement area to determine the quality index of the flatness of the entire wall surface.

6. The wall surface flatness measurement method according to any one of claims 1 to 4, characterized in that: The size of the measuring area is adapted to the size of the standard wall panel (12).

7. The wall surface flatness measurement method according to any one of claims 1 to 4, characterized in that: After step S1, a comparison test is performed. When a systematic error occurs between the debugging image and the standard image, an offset correction is performed.

Images