JPS62109181A - Symbol deciding system - Google Patents

Abstract

PURPOSE:To discriminate the positions and presence/absence of symbols remaining as the black areas at a high speed and in a large quantity, by applying the expansion processing, the contraction processing and thin line elimination processing to the connection lines and symbols in a connection diagram. CONSTITUTION:A black area enclosed by contours 5a and 5b reads a connection diagram containing a connection line 6 and a square symbol 7 through a pattern reading means 1 and supplies it to a symbol deciding means 2 to perform the expansion processing to expand a black area 8 in all directions. Then the contraction processing is carried out until the thinnest black area part 8a is equal to the 1-dot width. Then a line art 9 of the 1-dot width is deleted out of a pattern where the part 9 and a symbol part 10 of a large width. Thus only the part 10 remains and the presence of a symbol can be decided. The result of decision is stored in a memory 3 and the symbol is read out as necessary for the plotting purpose of the connection diagram.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a symbol determination method for determining whether or not a symbol exists in the middle of a connecting line.

[Conventional technology]

FIG. 4 is an explanatory diagram showing a connecting line tracking sensor for carrying out the conventional symbol determination method. In the figure, 11 is a base point window for detecting the base point of a connecting line, and 12 is a base point window for detecting straight line continuity of the connecting line. Windows 13 are a pair of windows for detecting bends or branches of the connecting line to the left or right.

Next, a drawing recognition method using this connection line tracing sensor will be explained.

First, place the connection line tracing sensor on the drawing so that the black pixel on the connection line is in the base point window 11, and when the direction of the connection line and the sensor are aligned, the pattern of black pixels that appears in the window 12.13, The following three cases are determined.

In the first case, as shown in FIG. 5(a), there are black pixels only in the window 12, and it can be determined that the connection line is running straight. At this time, the base point window 11 of the sensor is subsequently moved to the black pixel on the window 12, and the same scratching operation is repeated. The second case is when there are no black pixels in any of the windows 12 and 13 as shown in Figure 5 (bl), in which case it is determined that the connection line has terminated. Therefore, move the sensor back and forth by several pixels, and if the situation is similar to case 1, continue tracking as if the pixels are continuous.The third case is when there is a black pixel only in window 13 or if window 12 In the case where there are black pixels on both sides of .13, Fig. 5 fc
), (di, (el, (fl),
In addition to bends and branches of connecting lines, it can be determined that symbols have appeared. In this case, the sensor is returned to the previous base point and advanced pixel by pixel again to find the position (singular point) at which case 1 changes to case 3.

Next, the state of the pixels near the singular point is examined, and based on the characteristics, it is determined whether the end of the connection line is a connection line or a symbol. For this determination, a decision tree that branches into two under the conditions shown in FIG. 6 is used to classify cases into cases a, b, and c and symbol cases d and e. In case a, since the bend is tangent to M&1, the direction of the sensor is changed and tracking is continued. In case 6, one of the branched connection lines is traced, and the remaining connection lines are registered in the starting point table. In case C, other connection lines intersect, and tracking continues forward. In cases d and e, when a symbol appears, the symbol recognition module is executed.

[Problem that the invention seeks to solve]

Since the conventional symbol determination method is configured as described above, the connecting line tracing sensor must be moved sequentially to determine the symbol, and the process of determining the presence or absence of the symbol cannot be uniformly simplified. , there were problems such as the difficulty of high-speed determination by parallel processing of a large number of symbols.

This invention was made to solve the above-mentioned problems, and aims to provide a symbol determination method that enables parallel processing of a large number of symbols and increases the speed of determining the presence or absence of each symbol. shall be.

[Means for solving problems]

The symbol determination method according to the present invention expands a wiring diagram, then contracts it until the thinnest part of the wiring diagram becomes one dot wide, removes that one dot wide part, and removes the remaining black area. It is determined that there is a symbol at the position.

[Effect]

The symbol determination method of this invention focuses on the fact that the difference between connection lines and symbols in a wiring diagram depends on the thickness of the line, external size, etc., and uses the expansion, contraction, and deletion processes of the wiring diagram to generate a large number of symbols. It works to quickly determine the presence or absence of a symbol and the position of that symbol.

[Invention → Example]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a figure reading means for reading the whole or a part of a wiring diagram, 2 is a symbol determining means for separating symbols from connection lines from the wiring diagram read by this figure reading means 1, and performing recognition judgment processing, 3 is this symbol determination means. This is a memory that stores judgment results, and the symbols stored therein can be read out for drawing connection diagrams as needed.

Next, the operation will be specifically explained with reference to the flowchart shown in FIG.

First, when determining a symbol, a wiring diagram is read by the figure reading means 1 (step 2). Figure 3(a) is a part of the wiring diagram read in this way, and the outline 5a
, 5b consists of a connecting line 6 and a square symbol 7.

Next, the wiring diagram read in this way is read by the symbol determining means 2.
, and expands the black area in all directions to obtain the figure shown in Figure 3 (bl) (step ■).Here, 8
is a black area, of which 8a is the thinnest part as a whole. Next, this expanded figure data is subjected to shrinkage processing until the thin part becomes one dot width to obtain the figure shown in FIG. 3 (C1 (step ■). Therefore, the figure is The dot-width line portion 9 and the wide symbol portion 1° are continuous.

Furthermore, by removing the line portion 9 having a width of one dot from this figure, only the symbol portion 10 remains, as shown in FIG.

That is, the symbol part 1o in the black area exists at the position of the square symbol 7 in FIG. can be cut out.

Although not shown, other symbols in the above wiring diagram can be similarly identified and cut out.

〔Effect of the invention〕

As described above, according to the present invention, by subjecting connecting lines and symbols to expansion processing, contraction processing, and thin line removal processing, the position and presence/absence of symbols remaining as black areas can be determined in large quantities and quickly. It has the effect of obtaining what can be processed.

[Brief explanation of drawings]

Fig. 1 is a symbol judgment circuit diagram implementing a symbol judgment method according to an embodiment of the present invention, Fig. 2 is a flow diagram showing a symbol judgment processing method, and Fig. 3 is a graphic pattern explaining changes in symbol processing status. 4 is an explanatory diagram of a conventional connection line tracing sensor, FIG. 5 is a black pixel pattern diagram illustrating a conventional connection line processing method, and FIG. 6 is a flowchart of a conventional symbol determination process. 1 is a figure reading means, and 2 is a symbol determination processing means. Patent applicant Mitsubishi Electric Corporation Agent Patent attorney 1) Hiroshi Sawa (2 others) Ni4riA No. 5 (b) 13

Claims (1)

[Claims] In a symbol determination method that determines the presence or absence of a symbol in a wiring diagram separately from connection lines, after the wiring diagram is expanded, the thinnest part of the expanded wiring diagram is 1.
A symbol determination method characterized in that a contraction process is performed until the width of a dot is reached, and a part of one dot width after the contraction is completely removed, and it is determined that a symbol exists at the position of the remaining black area. .