Wall surface flatness measuring system and method

Abstract

The invention discloses a wall flatness measuring system and method, and belongs to the technical field of wall flatness detection. The wall flatness measuring system comprises a benchmarking device, a lighting device, a camera device and a data processing device. The benchmarking device comprises a standard wallboard and a standard light band arranged on the standard wallboard; the lighting device comprises a detection light band support and a detection light band arranged on the detection light band support. The camera device is used for acquiring a standard wallboard image and a wall surface measurement area image; and the data processing device is used for carrying out image identification on the acquired wall surface measurement area image and the standard wallboard image, and judging whether the wall surface flatness is qualified or not according to a preset allowable error. Standard wallboards are adopted for comparison measurement, so that the environment illuminance difference caused by factors such as positions and floors of all houses is effectively avoided, and the measurement result is easier to judge; the device is low in manufacturing cost, small in occupied space and suitable for indoor portable detection; and the data can be conveniently stored in real time and traced.

Description

Technical Field

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

[0002] Wall flatness is an important indicator of the quality of housing construction. For example, the flatness of the wall surface can be checked with a 2-meter straightedge and a feeler gauge. Generally, the deviation of ordinary plastering does not exceed 0.4 cm, and the deviation of high-grade plastering shall not exceed 0.3 cm. Therefore, whether it is the quality monitoring during the construction process or the index sampling inspection during the house delivery acceptance, this index will affect the internal quality of the house and actually relate to the living experience of the customers.

[0003] Therefore, as a mandatory measurement item for wall flatness, people have invented various detection devices and methods, such as direct mechanical ruler height difference measurement, laser distance measurement, overall wall up and down matrix ruler measurement and recording, etc. However, some of these measurement methods rely on feeler gauge detection, which is not convenient for information storage and quick judgment, and the inspection efficiency is low; some can achieve multi-point automatic measurement, but the measurement system is complex and large, with a high cost, and there are also disadvantages that it is not suitable for the detection of small spaces in ordinary residences. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a wall 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 calibration device, a lighting device, a camera device and a data processing device; The calibration device includes a standard wall panel and a standard light band provided on the standard wall panel; The lighting device includes a detection light band bracket and a detection light band provided on the detection light band bracket; The camera device is used to obtain the image of the standard wall panel and the image of the wall measurement area; The data processing device is used to perform image recognition on the collected image of the wall measurement area and the image of the standard wall panel, and judge whether the wall flatness is qualified according to the preset allowable error.

[0006] The beneficial effects of the present invention are as follows: Nowadays, a residential community usually has up to thousands or tens of thousands of households, and each household has more than a dozen walls. The workload of wall flatness detection is large. Using this measurement system is conducive to efficient detection, determination and archiving records. Using a standard wall panel for comparative measurement effectively avoids the environmental illumination differences caused by factors such as the location, floor, and lighting time of each house. Using one calibration for each room makes the measurement results easier to judge; the above measurement system has a low cost and occupies a small space, suitable for indoor portable detection; and it is convenient for instant data saving and easy to trace.

[0007] On the basis of the above technical solution, the present invention can be further improved as follows.

[0008] Further, the surface of the standard wall panel uses the same material and coating thickness as the wall surface to be measured.

[0009] The beneficial effect of adopting the above further solution is to reduce the influence brought by other factors in the subsequent comparison process and improve the accuracy of the comparison and determination between the measurement image of the measurement area and the standard image. Further, the detection light band bracket includes a detection light band mounting seat and a wall panel sticker. The detection light band is arranged on the detection light band mounting seat, and the detection light band mounting seat is connected to the upper end of the wall panel sticker.

[0010] The beneficial effect of adopting the above further solution is that when measuring the wall surface, the wall panel sticker is attached to the wall surface to be measured, which can meet the lighting requirements of the measurement area of the detection light band. Through the positioning of the wall panel sticker, the consistency between the detection light band and the wall surface to be measured is better.

[0011] Further, the included angle between the detection light band mounting seat and the vertical plane where the wall panel sticker is located is 30 - 80 degrees.

[0012] The beneficial effect of adopting the above further solution is that the lighting angle can be adjusted according to the actual measurement effect, which is convenient for forming obvious contrast between dark light and bright light along with the unevenness of the wall surface, so as to facilitate image recognition.

[0013] Further, the horizontal distance between the detection light band and the wall surface to be measured is 5 - 20 cm.

[0014] The beneficial effect of adopting the above further solution is that by using light closer to the wall surface, the difference in brightness of the light spots formed by the unevenness of the wall surface can be made clearer.

[0015] Further, the detection light band bracket further includes a lifting rod arranged at the lower end of the wall panel sticker, and the lifting rod is hinged to the wall panel sticker.

[0016] The beneficial effect of adopting the above further solution is that the lifting rod can meet the requirements at different heights of the wall panel sticker, making the detection of each measurement area more convenient and fast.

[0017] The present invention also relates to a method for measuring the flatness of a wall surface, including the wall surface flatness measurement system as described above, and the measurement steps are as follows: S1. Turn on the standard light band of the calibration device, keep the imaging device at a set distance A from the standard wall panel, obtain the standard image and upload it to the data processing device as the standard picture; S2. Divide the wall surface to be measured into multiple measurement areas, namely the first measurement area, the second measurement area... the nth measurement area, where n is an integer greater than 1; S3. Place the lighting device on one side of the measurement area, and keep the distance between the detection light band and the measurement area and the light incident angle the same as those between the standard light band and the standard wall panel; keep the distance between the imaging device and the measurement area equal to A, obtain a measurement image, and upload it to the data processing device as a measurement picture. S4. The data processing device compares the standard picture with the measurement picture, that is, performs image recognition, and determines whether it is qualified or unqualified according to the deviation. S5. Repeat the above steps S3 and S4 in sequence until the measurement of the wall to be tested is completed.

[0018] The measurement method of the present invention uses a standard wall panel for comparative measurement, avoiding the environmental illuminance differences caused by factors such as the location, floor, and lighting time of each house. Using one standard for each room makes it easier to determine the measurement results; the above measurement method is simple to operate and low in cost, suitable for indoor portable detection; and it is convenient to save the measurement data immediately for subsequent traceability.

[0019] Further, it further includes step S6. S6. The data processing device makes a comprehensive determination of the measurement results of each measurement area to determine the quality index of the flatness of the entire wall surface.

[0020] The beneficial effect of adopting the above further solution is to summarize the measurement results of each measurement area and make a comprehensive evaluation of the quality of the flatness of the measured wall surface.

[0021] Further, the size of the measurement area is adapted to the size of the standard wall panel.

[0022] The beneficial effect of adopting the above further solution is to avoid affecting the measurement results of the flatness of the wall surface in the measurement area due to different sizes of the measurement area and the standard wall panel. Further, a comparative test is carried out after step S1. When there is a systematic error between the debug picture and the standard picture, a bias correction is performed.

[0023] The beneficial effect of adopting the above further solution is to adjust the threshold for determining whether it is qualified by comparing the trial measurement wall surface image with the standard image, so as to facilitate correct determination during formal measurement. If the determination of the data processing device is different from the actual determination result due to environmental factors, the comparison threshold can be adjusted first, and then the measurement can be carried out one by one in each area formally. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the lighting device of the present invention; Figure 2 It is a schematic structural diagram of the measurement state of the lighting device of the present invention; Figure 3 It is a schematic structural diagram of the standard alignment device of the present invention; Figure 4 Schematic left view structure diagram of the benchmarking device of the present invention; Figure 5 Schematic sectional structure diagram of the wall surface to be measured of the present invention; Figure 6 Principle block diagram of the data processing device of the present invention; Figure 7 Flow chart of the wall surface flatness measurement method of the present invention; Figure 8 Schematic diagram of the brightness change of the standard picture and the measurement picture.

[0025] In the figure, 1 is the benchmarking device; 11 is the standard light band; 12 is the standard wall panel; 2 is the lighting device; 21 is the detection light band; 22 is the detection light band mounting seat; 23 is the wall attachment panel; 24 is the lifting rod; 25 is the handle; 3 is the imaging device; 4 is the wall surface to be measured. Specific embodiments

[0026] The principles and features of the present invention will be described below in conjunction with examples. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0027] As Figures 1 - 6 shown, a wall surface flatness measurement system includes a benchmarking device 1, a lighting device 2, an imaging device 3 and a data processing device; The benchmarking device 1 includes a standard wall panel 12 and a standard light band 11 provided on the standard wall panel 12; The lighting device 2 includes a detection light band support and a detection light band 21 provided on the detection light band support; The imaging device 3 is used to obtain the image of the standard wall panel and to obtain the image of the wall surface measurement area; The data processing device is used to perform image recognition on the collected image of the wall surface measurement area and the image of the standard wall panel, and to judge whether the wall surface flatness is qualified according to a preset allowable error.

[0028] The unit illuminance of the standard light band 11 and the detection light band 21 is equal.

[0029] For more accurate measurement, a detection environment with relatively dim light is selected during measurement, such as indoors at night.

[0030] The surface of the standard wall panel 12 uses the same material and coating thickness as the wall surface 4 to be measured. This reduces the influence of other factors in the subsequent comparison process and improves the accuracy of the comparison and determination between the image of the wall surface measurement area and the standard image. The detection light band 21 is arranged on the detection light band bracket, achieving the installation of the detection light band 21. Through the detection light band bracket, the requirement for the consistency of the positioning position between the detection light band 21 and the wall surface 4 to be measured can be met.

[0031] The detection light band bracket includes a detection light band mounting base 22 and a wall attachment board 23. The detection light band 21 is arranged on the detection light band mounting base 22, and the detection light band mounting base 22 is connected to the upper end of the wall attachment board 23. During wall measurement, when the wall attachment board 23 is attached to the wall surface 4 to be measured, the lighting requirements for the area to be measured by the detection light band 21 can be met. Through the positioning of the wall attachment board 23, the positioning consistency between the detection light band 21 and the wall surface 4 to be measured is better.

[0032] The included angle α between the vertical plane where the detection light band mounting base 22 and the wall attachment board 23 are located is 30 - 80 degrees. The lighting angle can be adjusted according to the actual measurement effect, facilitating the formation of an obvious contrast between dark and bright light with the unevenness of the wall surface, so as to facilitate image recognition.

[0033] The horizontal distance between the detection light band 21 and the wall surface 4 to be measured is 5 - 20 cm. Using light closer to the wall surface can make the difference in the brightness of the light spots formed by the unevenness of the wall surface clearer.

[0034] During actual measurement, the included angle α between the vertical plane where the detection light band mounting base 22 and the wall attachment board 23 are located is 55 degrees, and the horizontal distance between the detection light band 21 and the wall surface 4 to be measured is 14 cm.

[0035] The detection light band bracket further includes a lifting rod 24 arranged at the lower end of the wall attachment board 23, and the lifting rod 24 is hinged to the wall attachment board 23 with damping. The lifting rod 24 can meet the requirements at different heights of the wall attachment board 23, making the detection of each measurement area more convenient and fast.

[0036] A handle 25 is further provided at the free end of the lifting rod 24.

[0037] As Figures 1 - 8 shown, the present invention also relates to a method for measuring the flatness of a wall surface, including the wall surface flatness measurement system as described above, and the measurement steps are as follows: S1. The alignment device 1 turns on the standard light band 11, keeps the imaging device 3 at a set distance A from the standard wall board 12, obtains a standard image and uploads it to the data processing device as the standard picture Po; S2. The wall surface 4 to be measured is divided into multiple measurement areas, namely the first measurement area, the second measurement area... the 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 the measurement image, and uploading it to the data processing device as the measurement picture Pn; 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 according to the deviation; S5. Repeat the above steps S3 and S4 in sequence until the detection of the wall surface 4 to be detected is completed.

[0038] 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.

[0039] 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.

[0040] The method further includes step S6, wherein the data processing device makes a comprehensive judgment on the measurement results of each measurement area to determine the quality index of the entire wall surface flatness. The measurement results of each measurement area are summarized to make a comprehensive assessment of the quality of the measured wall surface flatness.

[0041] The size of the measurement area is adapted to the size of the standard wallboard 12, so as to avoid the difference in size between the measurement area and the standard wallboard 12 affecting the measurement result of the wall surface flatness of the measurement area. After step S1, a comparison test is performed. When there is a systematic error between the debugging image and the standard image, an offset correction is performed. That is, a visually flawless wall surface to be tested is selected to form a debugging image, and the debugging image is compared with the standard image. If the deviation is large, the deviation can be eliminated by adjustment, that is, the systematic error is eliminated. Specifically, by first testing the comparison between the wall image and the standard image, the threshold for judging whether it is qualified or not is adjusted to facilitate correct judgment during formal measurement. If the judgment of the data processing device is different from the actual judgment result due to environmental factors, the comparison threshold can be adjusted first, and then formal measurements can be made one by one by area.

[0042] The present invention uses a standard wall panel 12 for comparative measurement, avoiding differences in ambient light intensity in various houses due to factors such as location, floor, and lighting time, and adopts one room for one standard, so that the measurement result judgment standard is more unified; Figure 8As shown in the figure, the left figure is the standard picture Po, and the right figure is the measured picture Pn. Compared with the standard picture Po, there is a shadow in the measured picture Pn. Calculate the proportion of the area of the shadow region in the entire measured region. If it exceeds the set threshold, it is determined that there is a defect in the wall flatness of the corresponding measured region, and the wall flatness of the measured region is unqualified. The above measurement process is simple to operate and low in cost, suitable for indoor portable detection; and it is convenient to save measurement data immediately for subsequent traceability.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wall surface flatness measurement system, characterized in that, It includes an alignment device (1), a lighting device (2), a camera device (3) and a data processing device; The alignment device (1) includes a standard wall panel (12) and a standard light strip (11) provided on the standard wall panel (12); The lighting device (2) includes a detection light strip support and a detection light strip (21) provided on the detection light strip support; The camera device (3) is used to obtain an image of the standard wall panel and an image of the wall measurement area; The data processing device is used to perform image recognition on the collected wall measurement area image and the standard wall panel image, and judge whether the wall flatness is qualified according to a preset allowable error.

2. The wall flatness measurement system according to claim 1, wherein The surface of the standard wall panel (12) uses the same material and coating thickness as the wall to be measured (4).

3. The wall flatness measurement system according to claim 1, wherein The detection light strip support includes a detection light strip mounting seat (22) and a wall attachment plate (23). The detection light strip (21) is arranged on the detection light strip mounting seat (22), and the detection light strip mounting seat (22) is connected to the upper end of the wall attachment plate (23).

4. The wall flatness measurement system according to claim 3, wherein The included angle between the detection light strip mounting seat (22) and the vertical plane where the wall attachment plate (23) is located is 30 - 80 degrees.

5. The wall flatness measurement system according to claim 3, wherein The horizontal distance between the detection light strip (21) and the wall to be measured (4) is 5 - 20 cm.

6. The wall surface flatness measurement system according to claim 3, characterized in that, The detection light strip support further includes a lifting rod (24) provided at the lower end of the wall attachment plate (23), and the lifting rod (24) is hinged to the wall attachment plate (23).

7. A method for measuring the flatness of a wall surface, characterized in that, It includes a wall flatness measurement system according to any one of claims 1 - 6, and the measurement steps are as follows: S1. The alignment 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 picture; S2. Divide the wall to be measured (4) into multiple measurement areas, namely the first measurement area, the second measurement area... the nth measurement area, where n is an integer greater than 1; S3. Place the lighting device (2) on one side of the measurement area, keep 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, obtain a measurement image, and upload it to the data processing device as a measurement picture; S4. The data processing device compares the standard picture with the measurement picture, that is, performs image recognition, and determines qualified or unqualified according to the deviation; S5. Repeat the above steps S3 and S4 in sequence until the wall to be measured is detected.

8. The wall flatness measurement method according to claim 7, characterized in that, It further includes step S6. S6. The data processing device makes a comprehensive determination of the measurement results of each measurement area to determine the quality index of the flatness of the entire wall.

9. The wall surface flatness measurement method according to claim 7, characterized in that, The size of the measurement area is adapted to the size of the standard wall panel (12).

10. The wall surface flatness measurement method according to claim 7, characterized in that, After step S1, a comparison test is carried out. When there is a systematic error between the debug picture and the standard picture, a bias correction is performed.

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