JP2868754B1 - Building board system - Google Patents

Abstract

The present invention provides an inspection board system in which image signals of a plurality of building boards are displayed at once on a display device so that a finished state can be understood at a glance. SOLUTION: An image of a building board 2 is taken by a TV camera 1 for inspection, and image data d1, d2, d3 obtained by partially taking an image of the same part of a plurality of building boards 2 are taken as one.
Each time it is displayed on the display unit 10 and inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board inspection system for inspecting building boards, and more particularly, to a system for displaying and inspecting a plurality of building boards on a display device at one time.

[0002]

2. Description of the Related Art Conventionally, in order to inspect the finished state of a building board, under a lighting condition using a standard light source or a so-called north window light with reduced brightness, the quality of a painted building board is compared with a comparative reference product. In general, it is determined visually by doing so. In this case, the judgment items are mainly
In addition to the determination of poor hue, poor density (depending on the amount of paint applied), and contamination, in the case of sputter coating, the size of spots and the scattered state are also determined. In addition, a system has been developed in which a hue and density are checked using a colorimetric system using a precision spectrophotometer, and an image is enlarged using a microscope and the image is displayed on a television screen.

[0003]

Generally, since a plurality of building boards are shipped as one lump, it is necessary that all the building boards of this shipping unit are finished in the same hue, color tone, density and pattern. is there. However, in the conventional inspection of building boards, as described above, building boards of a predetermined size are subjected to measurement one by one, and it has not been possible to determine whether many building boards have the same finish. That is, while the conventional inspection board system mainly focuses on detecting the finish unevenness of one building board, there is a limit in capturing an image of a several m long building board and displaying it on a display device. That's why.

On the other hand, there is a simple line monitoring system to which an imaging system using a television camera is applied, and there are many examples of the system. However, the system is intended only to monitor the occurrence of an abnormal situation on the line, and does not consider inspecting the finish unevenness between many building boards at once. The present invention has been made in view of such a problem, and an object of the present invention is, in particular, to display image signals of a plurality of building boards on a display device at once, and to construct a large number of buildings at a glance. It is an object of the present invention to provide a plate inspection system that allows the user to know the overall finished state of a plate.

[0005]

In order to achieve the above-mentioned object, a board inspection system according to the present invention is for inspecting a building board, and comprises a TV camera for imaging the building board, and a TV camera.
The image processing apparatus includes: an image processing unit that combines image signals from a camera into an image signal in which a plurality of building boards are displayed on one screen; and a display device that displays the image signal processed by the image processing unit. .

Further, since the image processing means synthesizes a signal for displaying each building board portion, more building boards can be displayed on one screen. Further, the image processing means includes a sheet number setting means for setting the number of the building boards to be displayed on one screen by synthesizing, so that the image is displayed on one screen according to the number of building boards to be shipped at one time. The number of building boards can be set. Further, since the image processing means sets the size per building board to be displayed according to the number set by the number setting means, the building board is not displayed on the display screen. The display screen can be used effectively by reducing the number of parts.

[0007] Further, since the above-mentioned portions are provided at two places at both ends of the building board, or at three places at both ends and the center, unevenness in each building board can be inspected. According to the present invention, it is possible to display image data extracted from a plurality of building boards on the display device at a time and determine whether or not there is a sense of discomfort as a whole. As a result, it is possible to know the finished state of a set of building boards to be shipped.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the present invention, FIG.
As shown in (a), image data d1, d2, d3 at a predetermined location on the building board 2 is extracted. In the illustrated example, the building board 2
, The image data d1 at the left end, the image data d2 at the center, and the image data d3 at the right end are extracted, and each is a rectangle having a width L. Therefore, the total area of the image data d1, d2 and d3 extracted from one building board 2 is
Is W, the total area = W × L × 3.

FIG. 1A shows only one building board 2, but image data d1, d2 and d3 of the same location are obtained for arbitrary plural building boards. The image data d1, d2, and d3 can be obtained by a well-known means in which the building board 2 is imaged by a TV camera, and an image signal from the TV camera is reduced by an image processing means and synthesized.

The image data d1, d2, d3 of a plurality of arbitrary building boards 2 to be inspected are displayed on a display unit 10 such as a cathode ray tube as shown in FIG. That is, the image data d1, d2, and d3 of each of the plurality of building boards 2a, 2b, 2c,... 2n are displayed as one unit vertically adjacent to each other. The screen displayed on the display unit 10 in this way is visually inspected. Here, for example, focusing on the building board 2a, the building board 2f adjacent to the lower side and the building board 2f on the right side
If there is no uncomfortable feeling with the naked eye between the image data d1, d2, and d3 of b, it is determined that a good finished state is obtained.

In the above embodiment, the image data d1 and d2 at both ends of the building board 2 and the image data d3 at the center are obtained. However, the location and the number of image data to be extracted are arbitrary. However, sampling from three locations at both ends and the center provides high sampling accuracy, which is a preferable mode.

FIG. 2 shows an example of an image pickup means for obtaining an image signal. The image of the building board 2 is taken by the TV camera 1. The TV camera 1 sets the shooting distance so that the width m in the longitudinal direction of the imaging screen 3 slightly overlaps the both end guides 4 that guide the building board 2. Fine adjustment of both end images is performed at the stage of image processing. The start and end of the sampling of the image signal for the building board 2 are defined by detecting the front and rear ends of the building board 2 with the photoelectric switch 8 (shown in FIG. 4).

FIG. 3 is a diagram illustrating sampling and encoding of image data. Here, a sampling frequency of 13.5 MHz and an effective sampling point of 480 * 64 are used as a model.
Set to 0. Further, the image of the guide 4 at both ends of the building board 2 is excluded as unnecessary data in the process of processing the image signal. Therefore, in this description, 480 * 640 is used as the number of pixels for forming the image of the building board 2 portion. In addition, RGB obtained by using a CCD camera
It is also possible to quantize the data as it is.

As shown in FIG. 3 (a), the sampling structure is a square lattice sampling structure, and the encoding format is to digitally process the luminance signal Y and the color signals RY and BY individually. Y, RY, and BY for one pixel are each subjected to uniform quantization (linear quantization) PCM with 8 bits. At this time, the processing amount of color image conversion data for one screen is (8 + 8 + 8)
× 480 × 640 = 7.37 [Mbit] = 922 [k
B].

Each of the signals Y, RY, and BY is expressed by the following equation for the three primary color signals of red R, green G, and blue B: Y = 0.3R + 0.59G + 0.11B RY = 0.7R −0.59G−0.11B BY = −0.3R−0.59G + 0.89B

As shown in FIG. 3B, in the level conversion, the total amplitude of the quantized signal is set to 2 ⁸ = 256 levels, the luminance signal Y is set with the level 16 as a black level reference and the level 235 as a white level reference. The color signals RY and BY are converted into 220 levels of levels 16 to 235, and the full amplitude of the color signals is converted into 224 levels based on level 128.

FIG. 4 is a block diagram showing the basic configuration of the present invention. An image signal captured by the TV camera 1 is sent to the image processing unit 6. The image processing unit 6 sets the size of one building board to be displayed in accordance with the number of building boards to be displayed on one screen set in advance by the keyboard 7, and sets the size of the building board to be displayed by the photoelectric switch 8. The image signal transmitted from the TV camera 1 is reduced in accordance with the timing at which is detected, and the reduced image signal is sequentially stored in the image memory 9. The stored image signals are read out by the image processing unit 6 at any time and displayed on the display unit 10. Further, the printer 11 is connected to the image processing unit 6 in the same manner as a normal computer.
To print out the operating status of the system.

FIG. 5 is an operation flow of the image processing section 6 of FIG. First, it is determined whether or not the system power is ON (step S1). If NO, the process waits until the system power is turned ON. If YES, the corresponding condition value is read from a file stored in advance, and And the image processing unit 6 inputs the number of building boards to be displayed on one screen, and performs initial setting such as the size per building board to be displayed (step S2). In step S3, it is determined whether or not the building board 2 has been detected by the photoelectric switch 8. If NO, the process waits for detection. If YES, the process proceeds to step S4, where the image signal from the TV camera 1 is sampled. After quantizing and encoding the sampled image signal (step S5), the image is reduced, that is, the number of sample values of the image signal is reduced. As a method of reducing this, only the image signal in the range to be displayed may be extracted after removing the sample value and thinning out, or the average value of a plurality of sample values may be taken to reduce the sample value and then displayed. It is also possible to extract only the image signal in the range. Next, in step S7, the image signals of the reduced image are sequentially stored in the image memory 9, and in step S8, the portions d1 to d3 of the plurality of building boards 2 are displayed on the display unit by the stored image signals. Indicated by 10. This display may be at the timing when the image signals of one lot are accumulated, or at the timing when the image signals for one screen are accumulated. Next, step S9
, Determine if there is a next lot,
If there is a next lot in S, the process returns to step S2,
If NO, this flow ends.

The above image processing is merely an example, and the present invention is not limited to this. For example, the screen reduction process may be realized by reducing the number of samplings at the sampling stage (step S4) and then extracting only the image signals in the display range. As a result, the number of samples is reduced at this stage, so that real-time processing can be performed even if the processing speed of quantization / coding is reduced. The present invention
As shown in FIG. 1B, image data d1, d2, and d3 extracted from a plurality of building boards 2 are displayed on the display unit 10 at a time to determine whether or not there is a sense of discomfort as a whole. Yes, this makes it possible to reliably know the finished state of a set of building boards to be shipped.

[0020]

As described above, according to the present invention, the image signals of a plurality of building boards can be displayed on the display device at a time and inspected, so that one set of building boards to be shipped has the same finish. It is possible to determine at a glance whether or not the state is at a glance, and further, by synthesizing a signal for displaying the part of the building board, more image data of the building board can be displayed on the display device at one time, Inspection accuracy and inspection efficiency are improved.

[Brief description of the drawings]

FIG. 1A is a plan view showing an image data extraction point of a building board, and FIG. 1B is a view of a display unit 10 displaying image data.

FIG. 2 is a perspective view showing an imaging state of a building board by a TV camera in the present invention.

FIG. 3 is a diagram illustrating sampling and encoding of image data according to the present invention.

FIG. 4 is a block diagram showing a basic configuration of the present invention.

FIG. 5 is a detailed explanatory diagram of an operation flow of the image processing unit 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 TV camera 2, 2a-2n Building board 3 Imaging screen 4 Guide d1, d2, d3 Image data

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G01B 11/24-11/30 G01N 21/88 G06T 7/00

Claims (6)

(57) [Claims] 1. An inspection board system for inspecting a building board, wherein: a TV camera for capturing an image of the building board; and an image signal in which a plurality of the building boards are displayed on one screen by combining image signals from the TV camera. And a display device for displaying an image signal processed by the image processing means. 2. The board inspection system according to claim 1, wherein said image processing means synthesizes a signal indicating a part of each of said building boards. 3. The inspection board system according to claim 1, further comprising a sheet number setting unit that sets the number of the building boards to be combined and displayed on one screen by the image processing unit. 4. The image processing device according to claim 3, wherein the image processing means sets a size per building board to be displayed according to the number set by the number setting means. Inspection board system. 5. The inspection board system according to claim 2, wherein said portions are two places at both ends of a building board. 6. The inspection board system according to claim 2, wherein the portions are three places at both ends and a center of the building board.