JPH0426512B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a multi-window pattern discriminating device that uses a template matching method for discriminating patterns based on the degree of matching of an unknown pattern with a standard pattern (template), and particularly to improvements thereof. [Prior Art] As is clear from the various proposals that have been made for multi-window pattern discrimination devices, a plurality of observation areas of the target pattern, that is, window areas, are set within one screen field of view, and each window is The quality of the pattern is determined by measuring a predetermined image feature amount for each window and comparing it with a predetermined threshold value (judgment reference value). Furthermore, for combinations of multiple windows, the correlation of the feature values is determined. perform calculations,
The quality of the pattern is determined by comparing this correlation calculation value with another determination reference value. Figure 4 shows a pattern discrimination device previously proposed by the applicant (hereinafter referred to as the applied pattern discrimination device).
FIG. In the same figure, 1, 1a ~
1c is a discrimination target object pattern, 2, 2a to 2n are imaging devices such as industrial television (ITV) cameras,
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 are memory control circuits, and 8, 8a to 8d are control information memories. The pattern discrimination circuit 6 also includes a binarization circuit 61, a screen division circuit 62, an image memory 63, an image position detection correction circuit 64, and a window generation circuit 6.
5, 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, and 1c are each independently selected within the imaging field of view of the TV cameras 2a to 2n by transport devices (not shown) on different transport lines. TV camera is 2a~2
A plurality of image sensors (n) are provided, and the image information of the target pattern is sequentially scanned and converted into an electrical signal. 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 6. This selection is made by the control unit 5.
This command is performed based on a command from the TV camera 2a to 2n, 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, by assigning a number to each TV camera and configuring it to detect that the object 1 has arrived within its field of view and emit the signal _S1 , the control unit 5 can detect this signal S1. You can specify the camera number to select from ₁ . Further, the signal _S2 guided to the control unit 5 is given from another device (not shown) and is a signal indicating which of a plurality of target patterns it is. The panel setting unit 4 includes, for example, a keyboard, and these signals
This is to set the correspondence between S ₁ and S ₂ and control information (various information for discrimination) described later.
Decide how to process and distinguish the image signals from the TV camera. The control information for processing and determining the imaging signal is, for example, A ₁ ~A _o , B ₁ ~B _o , C ₁ ~
It is stored in the memory 8 as C _o , D ₁ to _{D o} ,
A desired one of these is read out via the memory control circuit 7 and given to each circuit in the pattern discrimination circuit 6. In addition, A, A ₁ to _{A o} are the imaging signals of 2
Threshold information for converting into values, B, B ₁ to _{B o} are pattern reference position information in the imaging screen, C, C ₁ to _{C o}
is window size/shape information, D, D ₁ ~ _{D o}
is the judgment criterion information. There are various possible combinations of these control information and TV cameras, one example of which is shown in the table below.

【table】

[Problem that the invention seeks to solve]

By the way, in cases where the same pattern to be inspected is made from a large material several at a time, such as printed boards for integrated circuits, there may be multiple identical 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 using the pattern discrimination device as described above, the same control information must be set according to the number of screens. This also applies 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; however, 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, reference position (position correction) information, window information, and judgment reference value information, each of which is repeatedly set to be almost the same or exactly the same for the number of screens. This may seem simple at first glance, but it is actually quite laborious and difficult work, and it usually requires a great deal of effort and time.As a result, 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 the 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. [Operation] For screens for which control information has not 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. [Embodiment] Fig. 1 is a main part configuration diagram showing an embodiment of the present invention.
Figure 2 is a reference diagram for explaining a line of display screens when performing a transfer operation in this invention;
The figure is a flowchart for explaining the transfer operation in this invention. In addition, in Figure 1,
9 is a CRT monitor, 10 is a switching section, 11 is a converting section, and the other parts are the same as in FIG. 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), 9
Reference numerals 4, 95, 96, and 97 are display units that display whether or not the binarization threshold information, position correction information, window information, and discrimination reference value information should be transferred, respectively. That is, when inspecting and discriminating the same or similar target patterns, the control information often becomes the same or similar patterns as described above. For example, cases such as and in the table above fall under this category. Therefore, if the control information of the case has already been set in the case, the case transfers the control information of the case other than the position correction (reference position) information to the specified address of the corresponding control information memory. However, if the control information for the case has already been set in both cases, all the control information for the case is transferred to a predetermined address of the corresponding control information memory. In other words, when the control information of a certain screen that has already been set can be used as is on another screen, the operation (also called copy operation) of transferring that control information to the corresponding control information memory as the control information of the other screen is performed. ). Note that the copied information must be able to be modified as appropriate. The copy operation according to the present invention will be explained below with reference to FIGS. 1 to 3. 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.
displayed on the CRT monitor 9. At this time, the switching unit 10 switches between the image capture screen from the binarization circuit 61 and the copy operation screen via the converting unit 11, while the converting unit 11 switches based on the 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 93. Input from the panel setting section 4 (see Fig. 3). next,
For each control information of binarization threshold information, position correction information, window information, and judgment criterion information, the control information is set to "1" for those that require copying, and "0" for those that do not require copying. (See Figure 3~). After that,
By giving a predetermined instruction, the selected control information is copied (transferred) to a predetermined address in the control information memory corresponding to the transfer destination screen. Note that the transferred control information should be able to be modified as necessary. Furthermore, in the above description, it is assumed that, for example, for the screen (or camera) 1, the first address of each of the control information memories 8a to 8d corresponds to the first address of each of the memories 8a to 8d. However, it is also possible to arbitrarily set the correspondence between the screens and the memories 8a to 8d, and by doing so, it is possible to flexibly set the combination of each screen and control information without increasing the memory capacity. can. Furthermore, the display device may be not only a CRT but also a liquid crystal or a light emitting diode, and it goes without saying that not only a keyboard but also a light pen, joystick, mouse, etc. can be used as an input device. [Effects of the Invention] According to the present invention, necessary control information on a certain screen can be set by a copy operation, so the setting operation becomes easier, reducing the burden and shortening the setting time. This provides the advantage of reducing setting errors. In addition, by copying the discrimination information, it is possible to know what discrimination information has been set for a certain screen, and furthermore, this can be modified and used, making it possible to make appropriate settings, further improving operability. can be improved.

[Brief explanation of drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of the present 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.
The figure is a flowchart for explaining the transfer operation in the present invention, and FIG. 4 is a block diagram showing a pattern discriminating apparatus for which an application has been filed. Code explanation, 1, 1a, 1b, 1c...target pattern, 2, 2a to 2n...imaging device (camera),
3...Camera selection circuit, 4...Panel setting section, 5
...Control unit, 6...Pattern discrimination circuit, 61...
Binarization circuit, 62... Screen division circuit, 63... Image memory, 64... Image position detection correction circuit, 6
5... Window generation circuit, 66... AND gate, 67... Feature extraction circuit, 68... Feature data memory, 69... Discrimination circuit, 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...2
Transferability display section for valorization threshold information, position correction information, window information, and judgment reference value.

Claims (1)

[Claims] 1. 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 binarization of the selected imaging signal at a predetermined threshold level. a position correcting means for detecting the edge of the target pattern on the imaging screen and calculating the correction amount from a predetermined reference position; and a window forming means for forming a predetermined window area based on the correction amount. and,
a determining means for extracting an image feature amount of the target pattern within the window and comparing it with a predetermined determination reference value for determination; and the binarization threshold information, reference position information, window information, and determination reference information. storage means for storing a plurality of types of each control information; a storage means for storing a plurality of types of each of the stored individual control information; and a storage means for reading out the stored individual control information based on a predetermined instruction. It is necessary to provide a storage control means to each of the corresponding means, an instruction means to give predetermined instructions to the storage control means and the selection means, respectively, and a transfer to be given for each of the various control information via the instruction means. and a transfer means for transferring, as control information for another screen, information that requires transfer among the various types of control information regarding the set screen to the corresponding storage means based on selection information as to whether or not the screen is set. A pattern discrimination device that