JPS61221978A - Multi-color drawing reader - Google Patents

Abstract

PURPOSE:To obtain a multi-color drawing reader which has a small number of recognition errors by extracting and recognizing independently the line excepting an exterior line and at the same time reading a drawing containing different color for each line to recognize patterns for each designated color. CONSTITUTION:When a multi-color drawing is supplied to a multi-color reader 11, the input data is turned into spot trains for each color by an image processor 2 and stored in a picture memory. Then the spot train data is analyzed by a main computer 3. In a normal processing mode, various types of lines are extracted according to the information on the stored colors. Then a character extracting process 5, an extracting process 6a for arrow marks, dimensional lines and auxiliary dimensional lines, an extracting process 8 for center line, an extracting process 12 for other lines and an extracting process 9 for exterior line are carried out sequentially. The recognition and registration are performed for each line. The exterior line is recognized and integrated with lines other than the exterior line in a recognition integrating process 13. Thus the exterior line is recognized and discriminated from the information on the dimensional lines, center line, etc. and the information on a relevant drawing is stored in a table. The result recognized finally is corrected in a conversational process 10 and delivered to an external display memory 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multicolor drawing reading device that recognizes and automatically reads nine drawings drawn in multiple colors.

[Conventional technology]

A conventional device of this type is shown in FIG. In the figure, 1 is a monochrome drawing reader that reads input drawings in binary format (white or black)9. The read data is subjected to preprocessing such as noise removal and line thinning using an image processor 2.

Further, 3 outputs the data subjected to recognition processing by the main computer to the external display/recording device 4 .

Next, the operation will be explained. First, in FIG. 4, an incoming drawing drawn in monochrome is read by a monochrome drawing reader 1, and data of a dot sequence of lines drawn in one drawing is transmitted to an image processor 2. Next, image processor 2
Then, processing such as line thinning and noise removal is performed, and the main computer 3 analyzes the point sequence data. At this time, first, in the single character extraction process 5, a group of lines in a certain small area are extracted as characters, and the first step is performed.

The blade of the arrow is obtained in the arrow extraction process 6, and based on the result, the dimension line and dimension extension line extraction process 7 is executed to obtain the dimension line and dimension extension line, and then the center line extraction process 8 is performed.Thus, one drawing is obtained. Extract only the outline of the above figure and use it for subsequent processing. Next, this extracted outline recognition processing 9
Obtain two-dimensional information of the outline drawn on the drawing by processing 1
Recognize shapes. Further, through the dialog processing 10, the operator edits the recognized figure, and finally outputs the drawing reading data to the external display/recording device 4.

[Problems that the invention is supposed to solve]

Since the conventional drawing reading device is configured as described above, the identification range is valid only within the predetermined dimensions. )%1f
The recognition order can only be performed in the order of one arrow, one dimension line, and one dimension extension line on the drawing, and it is impossible to extract only the dimension extension line alone. Also, it is impossible to recognize dotted lines and chain lines, and the point sequence data for each line segment is binary, black or white.
Because all lines are read as the same, the algorithm for extracting a single character from each line is extremely complex and often suffers from many recognition errors.

This invention was made in order to solve the above-mentioned problems.
The purpose of this invention is to obtain a multicolor drawing reading device that can independently extract and recognize lines, read drawings with different line colors, and perform figure recognition for each specified color, thereby reducing recognition errors. shall be.

[Means for solving problems]

The multicolor drawing reading device according to the present invention creates various lines on one drawing in different colors, adds color information to each line, and recognizes the lines. By doing so, each line is organized by color information and can be read independently. This is designed to extract information about each line and character.

[Effect]

Since the multicolor drawing reading device according to the present invention adds color information to various lines on one drawing, the various lines are organized according to color, and a v! It is possible to apply @ processing, and when creating 5 drawings, people classify various lines by one color, which reduces recognition errors in the computer.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as in FIGS. 3 and 4 are designated by the same reference numerals. In FIG. This is recognition integration processing.

Next, the operation will be explained. First, the multicolor drawing reader 11
A multicolor drawing is input to the image processor 2, and after being subjected to line thinning and noise removal processing, it is converted into a series of dots for each color and stored in an image memory. Next, the main computer 3 analyzes the one-point sequence data. In normal processing, various lines are extracted using classified color information, and one character extraction process is performed.5. Arrow 1 dimension line, dimension extension line extraction process 6a, center line extraction process 8. Other line extraction processing 12. Outline extraction processing 9 is performed sequentially to recognize and register each line. Recognition integration processing 1
3 performs recognition processing of the outline line and integration processing with lines other than the outline line, recognizes and discriminates the outline line from the information possessed by the 1-dimension line, center line, etc., and stores the information of the drawing in a table. Next, in the dialog processing 10, the finally recognized result is corrected by the operator hitting the keyboard from the outside, etc., and is output to the external display/recording device 4.

In addition, information on various lines can be obtained by specifying the color of one classification. It is possible to extract them independently,
For example, it is possible to configure the apparatus to extract and recognize only the outline lines without extracting lines other than the outline lines.

Next, among the effects and operations of the above-described embodiment, the processing performed by the main computer will be described in detail with reference to FIG. 2.

That is, each line of the input drawing is recognized color by color and registered in the table. First of all, for the point sequence data of one character part, the character part is recognized and registered 14, and the first step is
After recognizing and pre-processing the point sequence data of arrows, dimension lines, and dimension extension lines, and matching them with the registered characters,
Furthermore, it is registered 15 in another table. Regarding the point sequence data of the center line, center line recognition registration 16 is performed, and other line recognition registration 11 is performed in the same manner as for the center line. Next, regarding the point sequence data of the outline, first, outline recognition processing is performed using a straight line and one circular arc approximation, and the data is registered in a table (18). Next, recognition correction 19 is performed using the registered information of the center line and other lines.

For example, if the shape is not recognized as such even though it is bilaterally symmetrical, correction is performed by this recognition process.

Furthermore, the dimensions are associated with the dimension lines and the character information accompanying them, and the recognized outline lines, and recognition correction 20 is performed accordingly. Finally, through dialogue processing, a person externally performs recognition correction 21 and displays and records 22 on an external device.
do.

In the above embodiment, the case of a drawing input device was explained, but even in a simple character recognition device, the reliability of recognition of a single character can be increased by changing the color of alphabets, numbers, hiragana, katakana, kanji, etc. , has the same effect.

〔Effect of the invention〕

As described above, according to the present invention, the reading device is configured to extract and recognize nine characters and line segments drawn in a certain specified color, so that various lines can be classified by color. Since extraction and recognition can be performed independently, a multicolor drawing reading device with high recognition accuracy can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a multicolor drawing reading device according to an embodiment of the present invention, FIG. 2 is a recognition processing flow diagram of the multicolor drawing reading device according to an embodiment of the present invention, and FIG. 3 is a conventional drawing reading method. FIG. 4 is a detailed diagram of a conventional drawing reading device. In the figure, 2 is an image processor, 3 is a main meter, 4 is an external display/recorder, 11 is a multicolor drawing reader, 1
2 is the conventional line extraction process, 13#: recognition integration process, 6
a is an arrow 1 dimension line and dimension extension line extraction process. Patent applicant: Mitsubishi Electric Co., Ltd. Figure 2 Figure 3 procedural amendment (voluntary) Showa 6% 10. kidney day

Claims (2)

[Claims] (1) A multicolor drawing reader that optically reads drawings drawn in multiple colors, a main computer that receives data read by the drawing reader via an image processor, and designation as processing within the main computer. A multicolor drawing reading device comprising an external display/recording device that extracts and recognizes characters and line segment figures drawn in different colors, and records the results of the recognition processing. (2) The main computer's recognition processing steps include registration of character part recognition, registration of correspondence between the character part and arrows, dimension lines, and dimension extension lines, registration of recognition of the center line of the dimension line, and registration of recognition of the center line of the dimension line. Line recognition registration, outline recognition registration by straight line and arc approximation of each of the lines, recognition correction based on information on the center line and other lines, dimension input processing for the outline using the correspondence table between the dimension lines and characters, and Accompanying recognition correction, the respective recognition results are subjected to external recognition correction through interactive processing, and the results of the processing are sequentially executed and output to an external display/recording device. The described multicolor drawing reading device.