JPH0141027B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to a method for collecting a master pattern that is an improved method for collecting a master pattern from a master sample.

(2) Background of the technology In conventional pattern matching devices, when recognizing an input recognition pattern, a master pattern is prepared in advance, and a match is obtained between the master pattern and the recognition pattern. A technique is generally used in which pattern recognition of the recognized pattern is obtained when the pattern is recognized.

There is a technical problem to be solved in the method of collecting the master pattern in this technique, and the development of a solution is eagerly awaited.

(3) Prior art and problems The method of acquiring a master pattern in a conventional pattern matching device is to use an imaging system to image a master sample containing a pattern to be a master pattern, and then capture a predetermined size within its field of view. A master pattern portion was positioned within a master pattern area, and the pattern within the master pattern area was stored in a memory as a master pattern.

According to this method, even if there is a pattern similar to the master pattern cut out from the matching area, which is made up of the field of view and the peripheral area of the field of view that takes into account the positional shift of the master sample, it is not taken into account at all when collecting the master pattern. Not yet. Therefore, if the master pattern is used as is for pattern matching of the pattern to be recognized, a pattern similar to the master pattern within the matching area may be erroneously recognized.

(4) Purpose of the Invention The present invention was devised by focusing on the above-mentioned drawbacks of the conventional method, and its purpose is to provide a master pattern acquisition method that can input a master pattern into a memory that can improve the recognition rate. Our goal is to provide the following.

(5) Structure of the Invention And, this purpose is to collect a temporary master pattern from the field of view for collecting the master pattern when collecting a master pattern using a master sample, and to apply a temporary master pattern to the field of view and the matching area in the vicinity thereof. When performing pattern matching using the temporary master pattern and detecting the presence of a pattern similar to the temporary master pattern in the matching area, changing the master sample and collecting the temporary master pattern;
This is achieved by using the temporary master pattern in the case of no detection as the master pattern.

(6) Embodiments of the invention Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of an apparatus for implementing the present invention. In this figure, 1 is a sample feeding mechanism, on which a master sample 2 and a sample to be recognized 3 are placed. An imaging unit, for example, a TV camera 4, captures images of these sample imaging areas.
It is. This TV camera 4 is connected to the recognition section 3 via a binarization circuit 5. The input of the frame memory 6 of the recognition unit 3 is connected to the output of the binarization circuit 5, and is configured to store the binarized signal while maintaining the shape of the pattern within the field of view of the TV camera 4. . Reference numeral 7 denotes a master pattern memory that stores a pattern in a specific area within the pattern stored in the frame memory 6, that is, a master pattern area, as a master pattern. Reference numeral 8 denotes a check circuit that performs pattern matching using the master pattern on a matching area consisting of an area from which the master pattern of the frame memory 6 has been cut out and its neighboring area to check for the presence or absence of similar patterns. Reference numeral 9 denotes a pattern matching circuit that scans the frame memory with the master pattern from the master pattern memory and checks whether a match with the master pattern is obtained.

The output of the pattern matching circuit 9 is sent to the control section 10.
The bonding mechanism 11 is configured to be controlled by this control section 10.

Next, the operation of the above-mentioned component device will be explained.

First, the sample feeding mechanism 1 is moved to introduce the master sample 2 into the field of view of the TV camera 4.
A characteristic pattern area (master pattern area (Fig. 2 2-1P1)) of master sample 2 is positioned in a specific area within the field of view (a in Fig. 2 2-1), and the pattern in that specific area is The pattern is stored in the master pattern memory 7 via the camera 4, the binarization circuit 5, and the frame memory 6, and is used as a temporary master pattern.

Using this temporary master pattern, the above specific area in the frame memory 6 and its surroundings (nearby area)
Pattern matching is performed on the matching area (FIG. 2-2-1b). The check circuit 8 performs this. In this pattern matching, a neighboring area P2 of the master pattern area P1 (that is, the area where the temporary master pattern was taken)
If the same or similar patterns appear when performing pattern matching (see 2-1 in FIG. 2), the degree of matching will be the same as shown in 2-2 in FIG.

In this case, since there is a high possibility that P2 will be misrecognized during pattern matching, the check circuit 8 outputs an alarm output to request a change in the master sample.

Assume that the acquisition of the master pattern as described above is performed for the changed master sample, and that it is a pattern as shown by P1' in 3-1 of FIG. Even if pattern matching is performed on the above-mentioned matching region b' using this pattern, the degree of matching is the same as that of P1' as shown in FIG. 2 at all positions in the region b' including the P2' position. Since there is no pattern to obtain, this pattern is used as a master pattern for subsequent recognized samples.

According to the master pattern acquisition method of the present invention, even if a similar pattern appears in the matching area as described above in a fully automatic wire bonder, for example (see FIG. 2),
It is highly possible to prevent the controller 10 from erroneously recognizing this similar pattern and causing the bonding mechanism to perform a bonding operation for that pattern.

In the above embodiment, a case has been described in which checking for the presence or absence of similar patterns is performed on the entire periphery of a specific area, but if it is sufficient within a specific range, pattern matching may be performed within that range. The effect of shortening the matching time can be obtained by narrowing the range.

(7) Effects of the Invention As described above, according to the present invention, since the presence or absence of a similar pattern is checked around the collection area of the master pattern, pattern matching with the obtained master pattern is not possible. In this case, it is possible to prevent erroneous recognition of similar patterns that may appear within the field of view taking into account the positional shift of the sample to be recognized.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the configuration of an apparatus for implementing the present invention, and FIGS. 2 and 3 are diagrams used to explain the operation of the apparatus shown in FIG. 1. In the figure, 2 is the master sample, 4 is the imaging system, and 5
1 is a binarization circuit, 6 is a frame memory, 7 is a master pattern memory, and 8 is a check circuit.

Claims (1)

[Claims] 1 When collecting a master pattern using a master sample, a temporary master pattern is taken from the field of view for collecting the master pattern, and pattern matching is performed using the temporary master pattern in the field of view and the matching area in its vicinity. When detecting the existence of a pattern similar to the temporary master pattern in the matching area, the master sample is changed and a temporary pattern is collected, and the temporary master pattern in the case where no detection is detected is used as the master pattern. A method for collecting master patterns characterized by the following.