JPS638986A - Character graphic arranging inspection device - Google Patents

Abstract

PURPOSE:To attain the rapid character graphic arranging inspection with high position accuracy by using the number of the outline picture element of a character graphic as a processing object. CONSTITUTION:An one-dimensional CCD camera 1 photographs a character graphic image printed on a key top arranged on the surface of a keyboard 2 which is an inspected object. A camera driving mechanism part 3 shifts the one-dimensional CCD camera 1 in the direction orthogonal to the paper surface. A binary data output circuit 4, each time the one-dimensional CCD camera 1 shifts to the constant distance, fetches a photographed video signal (a), compares with the threshold level set beforehand and converts it to a binary data column (b). A direction extracting circuit 5, each time the binary data column (b) is inputted, outputs a binary data column (c) to make only an outline constituting picture element of a photodetecting element arranging direction (X direction) into '1' and the element except it into '0' a binary data column (d) corresponding to the outline constituting picture element of a camera shifting direction (Y direction) and a binary data column (e) corresponding to the outline of an X direction, a Y direction and the direction to form 45 deg. and the corner constituting picture element, to a deciding circuit 6.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a character/figure arrangement inspection device that inspects objects in which various character/figures are arranged on a two-dimensional plane, and is particularly applicable to keyboards and key i4 channels. The present invention relates to a key top arrangement inspection device.

[Conventional technology]

Conventionally, this type of character/figure arrangement inspection apparatus moves a high-resolution one-dimensional solid-state image sensor camera to create two-dimensional image data about the surface of the object to be inspected.

It used a method such as the gin-length method to recognize each character and compare it with the regular arrangement.

[Problem that the invention seeks to solve]

In the conventional character arrangement inspection device described above, the line width is 1, for example, 0.
5 mm, the resolution per pixel is 0 when inspecting a semi-standard key date with an arrangement area of about 150 mm x 400 x.
．． In one group, each pixel must process 6 megabits of two-dimensional image information, even as binary data, and the two image processing units are complex and expensive, and the processing speed is slow.

On the other hand, it is possible to convert the video signal obtained by the one-dimensional solid-state image sensor camera mentioned above into a binary data string, simultaneously image the regular inspection object with another camera, and perform similar processing. , or a binary data string obtained by retrieving one-dimensional data corresponding to the imaging position from two-dimensional reference data stored in a memory in advance, and a binary data string obtained from the object to be inspected. There is a method of calculating whether or not the values of each bit match between the two, and determining whether or not the character/figure arrangement is acceptable based on the total number of mismatched data. In the case of an apparatus using this method, although the processing circuit is fast and simple, it is necessary to maintain the position accuracy of each character figure to be inspected within ±1 image.

Considering the product specifications such as key tops, there was a drawback in that it was extremely difficult to maintain positional accuracy.

Therefore, two objects of the present invention are to solve the above problems.

It is an object of the present invention to provide a character/figure arrangement inspection device that is quick and has high positional accuracy.

[Means for solving problems]

According to the present invention, there is provided a one-dimensional solid-state image pickup device camera having light receiving elements arranged in a row, a camera drive mechanism unit that moves the camera in a direction perpendicular to the direction in which the light receiving elements are arranged, and a camera driving mechanism that moves the camera a certain distance by moving the camera in a direction perpendicular to the direction in which the light receiving elements are arranged. A binary data output circuit unit that converts the video signal obtained by imaging a straight line portion of the surface of the object to be inspected at intervals into a full binary data string and outputs it, and sequentially inputs the binary data string and writes it into a memory. At the same time, a direction extraction circuit unit extracts only pixels that are continuous in the light receiving element arrangement direction and the camera movement direction from among the pixels constituting the two-character figure outline by a logical operation with the binary data; ,
and a determination circuit unit that calculates the total number of pixels in each direction and determines whether or not the arranged character figure is normal based on whether the total number of pixels is within a predetermined tolerance range. A character/figure arrangement inspection device is obtained.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. -Dimensional COD camera 1 captures character and graphic images printed on key tops arranged on the surface of keyboard 2, which is an object to be inspected.

The camera drive mechanism section 3 moves the one-dimensional CCD camera 1 in a direction perpendicular to the plane of the figure. - The area within the broken line in the figure is a circuit group that processes image data. Binary data output circuit 4
captures the captured video signal a every time the one-dimensional CCD camera 1 moves a certain distance, compares it with a preset threshold level, converts it into a binary digital sequence, and outputs it.

When the binary data string S is inputted, the direction extraction circuit 5 generates a binary data string C in which only the contour forming pixels in the light receiving element arrangement direction (hereinafter referred to as the X direction) are set to @1'' and the others are set to 0#.

Similarly, a binary data string d corresponding to the contour constituent pixels in the camera movement direction (hereinafter referred to as the Y direction) and a binary data string e corresponding to the contour and corner constituent pixels in a direction making 45 degrees to the X and Y directions. Output.

In the determination circuit 6, for example, if "4" on the keyboard shown in FIG.
When inspecting the arrangement of the character ``, consider the existence area 10 of the character indicated by a rectangle in the figure.

The total number of 111'' included in the binary data strings c, d, and C only for the pixel data in this area n(c)
, n(d), n(e), and according to a preset criterion, that is, if the regular character "4#" is within the existence area, [the calculated n(c), n( Compare p n(c), n(d) with each upper limit value and lower limit value of d), n(e).
.

If all of n(e) are within the allowable range, it is determined that the arrangement is normal. The same process is carried out for other characters and figures that require inspection, and if all the layouts are normal, the inspection is passed and a “1” is assigned, and if even one is abnormal, the inspection is failed and an “O” is assigned.
” is output as the test result signal f.

Next, details of the direction extraction circuit 5 will be explained with reference to the drawings. FIG. 3 is a circuit diagram of this direction extraction circuit 5. 11,
12, 14, and 15 are 1-bit shift registers, and 13 is an (N-2) bit shift register in which the number of elements of the solid-state image sensor is N.

As the binary data string outputted from the binary data output circuit 4 is input one bit at a time, the data up to that point is sequentially shifted within the shift register group. At this time, the four pixel data indicated by plqlr18 in the figure are extracted from the X-direction extraction circuit 17. It is input to the Y direction extraction circuit 18 and the 1C45'' direction and corner extraction circuit 19.Therefore, the three direction extraction circuits 17, 18 and 19 have two inputs as shown in FIG.
Binarized pixel data P, Q, R, and S in a 2×2 area are inputted, which are moved bit by bit on the XN pixel data array in synchronization with the shift timing described above.

Each direction extraction circuit performs the following logical operations and outputs the operation results as extraction results.

(X-direction contour pixels) P-mutual, R-100+100, Q-R-
8 (Y direction contour pixels) P-Q-R-3+P-Q-
R-S (4”: direction contour surface element) P-Q-R-8+P-
Q-R-S+P・Q・R-8 FIG. 5 shows contour pixels in each direction extracted by the above calculation for the character “4n” as an example of the calculation results. Δ mark is Y
Directional contour pixel 2 indicates a 45' direction contour and a corner pixel.

As described above, in the character/graphic arrangement inspection apparatus according to the present invention, the image data processing circuit portion can be constructed simply and inexpensively by a shift register/counter, a converter/'Plator, and a logic operation element. Further, since the number of pixels of the outline of the character/figure is used as the processing target, precise positioning of the object to be inspected is not necessary. Furthermore, the above-mentioned through/doware configuration processes and compresses information in real time from two-dimensional image information to contour pixels in each direction and total number information for each character/figure existing area. Inspection time is drastically reduced. for example.

Comparing and determining the existence area of each character figure in the aforementioned determination circuit section with the standard value of the number of contour pixels in each direction, each It is possible to output the result at the input cycle of the pixel data judgment circuit section,
The inspection time is equal to the time required to move the camera. Therefore, as a one-dimensional CCD camera, the number of elements is 2048 bits, the scanning period is 2 m5ec (for example, 5c-2048NB: N
EC), and if the object to be inspected is continuously imaged while moving this camera at a constant speed of 50+m/sec, then 1
50tIIa x 4001m key? - It is possible to inspect a surface in 8 seconds with a pixel resolution of 0.1 square degrees.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a plan view of a keyboard as an example of an object to be inspected, Fig. 3 is a circuit diagram of a direction extraction circuit, and Fig. 4 is a direction extraction circuit. FIG. 5 is a pixel layout diagram showing an example of the calculation result of the direction extraction circuit. l...1-dimensional CCD camera, 2...keyboard, 3
... Camera drive mechanism section, 4... Binary data output circuit, 5... Direction extraction circuit, 6... Judgment circuit, 10...
・Existence area. 11.12, 14.15...1 bit shift register, 13...(N-2) bit shift register. 17...X direction extraction circuit, 18...Y direction extraction circuit. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A one-dimensional solid-state image sensing device camera provided with light receiving elements arranged in a line, a camera drive mechanism section that moves the camera in a direction perpendicular to the direction in which the light receiving elements are arranged, and a camera driven by the camera at fixed distance intervals. Converts the video signal obtained by imaging the straight line portion of the inspection object surface into a binary data string and outputs it 2
A value data output circuit unit sequentially inputs the binary data string and writes it into the memory, and at the same time performs a logical operation with the binary data to determine the direction of the light receiving element array and the camera. A direction extraction circuit extracts only pixels that are continuous in the moving direction in each direction, and the total number of pixels in each direction is determined, and the placed character/figure is determined to be normal depending on whether or not it is within a predetermined tolerance range. 1. A character/figure arrangement inspection device comprising: a determination circuit unit for determining whether or not the character/figure placement is a