JPS6250972A - Pattern discrimination device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a multi-window pattern discrimination device that extends the template matching method that discriminates patterns based on the degree of matching of an unknown pattern with a standard pattern (template); Especially regarding its improvement.

[Conventional technology]

As is clear from the various proposals that have been made for multi-window pattern discrimination devices, multiple observation areas of the target pattern, that is, multiple window areas, are set within one screen field of view, and a predetermined area is set for each window. The quality of the pattern is determined by measuring the image feature amount and comparing it with a predetermined threshold value (judgment reference value), and further performs a correlation calculation of the feature amount for combinations of multiple windows. The quality of the pattern is determined by comparing this correlation calculation value with another Q determination reference value.

FIG. 4 is a block diagram showing a pattern discrimination device previously proposed by the applicant (hereinafter referred to as the pattern discrimination device for which the application has been filed). In the figure, 1 (1a to 1c) is a discrimination target object pattern, and 2 (2a to 2n) is an industrial television (I
TV) An imaging device such as a camera, 3 is a camera selection circuit, 4
is a panel setting section, 5 is a control section, 6 is a pattern discrimination circuit,
7 (7a to 7d) is a memory control circuit, 8 (8a to 8d)
is a control information memory. The pattern discrimination circuit 6 also includes a binarization circuit 61, a screen division circuit 62) an image memory 63,
Image position detection correction circuit 64, window generation circuit 65,
It is composed of an AND gate 66, a feature extraction circuit 67, a feature data memory 68, a discrimination circuit 69, and the like.

The operation will be explained.

It is assumed here that the objects 1a+1b+1c are each independently carried within the imaging field of view of the TV left cameras a-2N on different conveyance lines by conveyance devices (not shown). A plurality of TV cameras 2a to 2N are provided, and image information of the target pattern is sequentially scanned and converted into electrical signals.

Imaging (video) signals from each TV camera are led to a camera selection circuit 3, where only one of them is selected and applied to a pattern discrimination circuit B. This selection is performed based on a command from the control section 5, and the command is formed by a signal S1 given through each of the TV cameras 2a to 2N and the corresponding individual sensor. That is, each T
By assigning a number to each V camera and configuring it to detect that the object 1 has arrived within its field of view and emit a signal S1, the control unit 5 can detect this signal S1.
The camera number to be selected from 1 can be specified.

Further, the signal S2 guided to the control section 5 is given from another device not shown, and is a signal indicating which of a plurality of target patterns is the target pattern. The panel setting unit 4 includes, for example, a keyboard, and these signals S1. This is to set the correspondence between S2 and control information (various information for discrimination) to be described later, and determines how to perform processing 2 discrimination on the image signal from the selected TV camera. The control information for determining the processing 2 of the imaging signal is, for example, A1 to AHm B.
1 to Bn, C1 to Cn, and D1 to Dn, a desired one of these is read out via the memory control circuit 7 and applied to each circuit in the pattern discrimination circuit 6. It will be done. Note that A (A1 to An) is an image signal of 2
Threshold information for converting into values, B (B1 to Bn) is pattern reference position information in the imaging screen, C (C1 to Cn) is window size/shape information, and D (D1 to Dn) is judgment standard. It is information. Various combinations of the control information and the TV camera can be considered, examples of which are shown in the table below.

That is, Case E in the table is an example in which the TV camera number l and control information A1 to Di are associated together, and Case ■ is an example in which the same TV left camera mutually changes its control information to perform pattern discrimination. Cases ■～■ have TV camera number n and control information A i m B j + Ck
*This is an example in which Dt and Dt are made to correspond to each other individually. In this way, by appropriately combining each target pattern or screen with various types of control information, stable and highly accurate discrimination processing can be performed.

- In the pattern discrimination circuit 6, the image signal selected via the camera selection circuit 3 is amplified to an appropriate level in the binarization circuit 61 to form a binarized image. Value information A is given to the binarization circuit 61 via the memory control wholesale circuit 7A.

This binarized image is divided into a predetermined number of pixels by the screen division circuit 62 and stored in the image memory 63, and the two-dimensional coordinate position of the edge of the pattern within the imaging screen is determined by the image position detection correction circuit 62. Detected at This position data is given to the window generation circuit 65, and the window generation timing is corrected using this position data. That is, information regarding the shape and size of the window is given to the window generation circuit 65 via the memory control circuit 7C, but this information is issued with reference to a predetermined point on the imaging screen. However, since the pattern edges detected through the image position detection and correction circuit 64 generally vary, the window generation position must be corrected (position normalized) based on this. For this reason, the reference position information B is provided to the position detection correction circuit 64, and the correction amount is determined from this information and the edge detection value. The output from the window generation circuit 65 and the output from the image memory 63 are ANDed by an AND gate 66, and the feature extraction circuit 67 thereby measures feature data such as area values within a window region of a predetermined shape. do. In addition,
This feature extraction circuit 67 is a two-dimensional local memory, as is well known.
It consists of a two-dimensional local arithmetic circuit, a counter, etc.

The characteristic data for each window obtained by scanning is stored in the memory 68. The discrimination circuit 69 compares the data from the memory 68 with judgment reference data D given via the memory control circuit 7d, and outputs the discrimination result.

[Problem that the invention seeks to solve]

By the way, when the pattern to be determined is made several pieces at a time from the same large material, such as printed boards for integrated circuits, there may be multiple patterns to be inspected on one material (object). They will be lined up individually. At this time, if the pattern to be inspected has a complicated shape, highly accurate discrimination with increased resolution is possible by dividing the entire object into a plurality of partial screens instead of one screen. In such a case, in order to perform discrimination processing by the pattern discrimination device as described above, the same control information must be set according to the number of picture heads. This may also be the case when multiple target patterns are similar to each other; most of the control information is the same and only a portion of it is different, but even in such cases, the control information can be set for each screen. There is a need to.

However, this control information includes binarization threshold information,
There is reference position (position correction) information, window information, and judgment reference value information, and repeatedly setting each of them to be almost the same or exactly the same for the number of screens may seem simplistic, but in reality This is a fairly painstaking and difficult task, and usually requires a great deal of effort and time, and as a result, there is a problem in that setting errors are likely to occur.

Therefore, an object of the present invention is to provide a pattern discrimination device in which various control information can be easily set.

[Means for solving problems]

Transfer means is provided for transferring at least one of various types of control information regarding a predetermined screen to a corresponding storage means as control information for another screen.

[Effect]

For screens for which control information has not yet been set, the necessary control information of already set screens is transferred to the corresponding storage means by the transfer means, thereby facilitating the setting operation.

〔Example〕

Fig. 1 is a main part configuration diagram showing an embodiment of this invention, Fig. 2 is a reference diagram for explaining an example of a display screen when performing a transfer operation in this invention, and Fig. 3 is a transfer operation in this invention. It is a flowchart for explaining. In FIG. 1, 9 is a CFtT monitor, 10 is a switching section, 11 is a converting section, and the other parts are the same as in FIG. 4. Further, in FIG. 2, 91 is a monitor screen, 92 is a display section showing the screen number of the transfer side (transfer source), 93 is a display section showing the screen number of the transfer side (transfer destination), 94°95 ．．
96 and 97 are binarization threshold information, respectively.

This is a display unit that displays whether or not position correction information, window information, and second stabbing reference value information should be transferred. That is, checking for identical or similar target patterns.

When determining, as described above (the control information often has the same or similar patterns. For example, cases V and VI, VI and If the control information for case V has already been set in case (2) and (2), then in case (2), other control information other than the position correction (reference position) information among the control information for case V is set in the corresponding control information memory. If the control information for case ■ has already been set in cases ■ and ■, all control information for case ■ is transferred to the corresponding predetermined address of the control information memory.In other words, When the control information of a screen that has already been set can be used as is on another screen, perform an operation (also called a copy operation) to transfer the control information to the corresponding control information memory as the control information of the other screen. This is a distinctive feature.The copied information must be able to be modified as appropriate.

Hereinafter, the first to third copy operations according to the present invention will be described.
This will be explained with reference to the figures.

First, by giving a predetermined instruction from the panel setting section 4 shown in FIG. 1, a screen as shown in FIG. 2 is displayed on the CRT monitor 9. At this time, the switching unit 1° switches between the image capture screen from the binarization circuit 61 and the copy operation screen via the conversion unit 11, while the conversion unit 11 switches based on instructions or data from the panel setting unit 4. to form predetermined characters, symbols, etc. Next, the number of the screen (transfer source) that has the control information that has already been set is displayed on the display section 92 in FIG. 2, and the number of the screen (transfer destination) that requires the control information is displayed on the display section 9B. Each input is made from the panel setting section 4 (see ◯ and ◯ in Fig. 3). Next, binarization threshold information, 2-position correction information, and window information.

For each control information in the judgment criteria information, select the control information by setting, for example, '1.'' for the control information that requires copying, and 0# for the control information that does not require copying (Fig. 3 -
(see 0). After that, by giving the prescribed instructions,
The selected control information is copied (transferred) to a predetermined address in the control information memory corresponding to the destination screen. Note that the transferred control information can be modified as necessary. Further, in the above description, for example, regarding the screen (or camera) 1, the control information memories 8a to 8
Although it is assumed that the screen corresponds to each first address of d, it is also possible to set the correspondence relationship between the screen and the memories 8a to 8d arbitrarily, and by doing so, the memory capacity can be increased. It is possible to flexibly set combinations of each screen and control information without having to do so. Furthermore, the display device can be not only a CRT but also a liquid crystal or a light emitting diode, and the great sword device can be used not only as a keyboard but also as a light pen, joystick, etc.
Needless to say, a mouse or the like can be used.

〔Effect of the invention〕

According to this invention, since the control information necessary for the screen can be set by a copy operation, the setting operation becomes easier, reducing burden, shortening the setting time, and reducing setting errors. Benefits provided. In addition, it is possible to know what kind of discrimination information has been set on the screen consisting of a copy of the discrimination information, and furthermore, this can be modified and used, making it possible to make appropriate settings, further improving operability. can be done.

[Brief explanation of drawings]

Fig. 1 is a main part configuration diagram showing an embodiment of the present invention, Fig. 2 is a diagnostic diagram for explaining an example of a display screen when performing a transfer operation in this invention, and Fig. 3 is a transfer diagram in this invention. A flowchart for explaining the operation, and FIG. 4 is a configuration diagram showing a pattern discrimination device for which an application has been filed. Code explanation 1 (1a, 1b# 1c)-611 - target pattern, 2
(2a-2n)... Imaging device (camera), 3.
... Camera selection circuit, 4 ... Panel setting section, 5 ... Control section, 6 ... Pattern discrimination circuit, 61 ... Binary value circuit, 62...
・Screen division circuit, 63... Image memory, 64 Image position detection correction circuit, 65... Window generation circuit, 66... AND gate, 67... Song feature extraction circuit , 68...Feature data memory, 69.
・Four discrimination circuits, 7 (7a to 7d)...Memory control circuit, 8 (8a to 8d)...Control information memory, 9...CRT monitor, 91... ...Monitor screen, 92...Transfer source screen number display section, 93
...Transfer destination screen number display section, 94.95, 96
．． 97... Binarization threshold information 1 position correction information, window information 2 determination reference value transfer permission display section. Representative patent attorney Kiyoshi Matsuzaki 1135!

Claims (1)

[Scope of Claims] A plurality of imaging means for respectively imaging a plurality of target patterns; a selection means for selecting one of the imaging means based on a predetermined instruction; and a selection means for selecting one of the imaging means based on a predetermined instruction; a binarization means for binarizing at a level; a position correction means for detecting the edge of the target pattern on the imaging screen and calculating the amount of correction from a predetermined reference position; a window forming means for forming a window; a discriminating means for extracting an image feature amount of a target pattern within the window and comparing it with a predetermined criterion value to make a determination; and the binarization threshold information and reference position information. , a storage means for storing a plurality of types of each control information of window information and judgment criterion information, and a storage control means for reading out each piece of stored control information based on a predetermined instruction and providing it to the corresponding means, instruction means for giving predetermined instructions to the storage control means and the selection means, respectively; and transfer means for selectively transferring the various control information regarding a predetermined screen to the corresponding storage means as control information for another screen; A pattern discrimination device comprising: 2) A pattern discriminating device according to claim 1, wherein the transfer means includes an input means and a display means, and transfers the control information in an interactive manner.