JPS63189975A - Graphic input device - Google Patents

Abstract

PURPOSE:To rapidly and surely obtain a graphic input with a simple operation by adding feature data to drawing information defined to be short segment data by binarizing and reading, forming and storing segment element data and using it. CONSTITUTION:After the drawing is binarized and read by a picture input device 1 and stored in a picture data memory, a picture is reduced, finely lined and subjected to a sequence of points forming processing by a picture encoder 2 to form and store sequence of points data. Based on this data, the short segment data is formed in a graphic data forming device 3 and displayed on a CRT display device 4. When the feature data such as a straight line or a circular arc, or a clockwise circular arc or a counterclockwise circular arc is inputted to this display graphic through a mouse 6 or the like, the segment element data formed by adding the feature data to the short segment data is formed in the device 3 and stored in an built-in graphic data memory. This graphic data is read through a keyboard 5 or the like and displayed, and then, a desired graphic input can be rapidly and surely obtained with the simple operation in a CAD or the like.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a graphic input device in CAD or CAM that inputs graphic data from an image input device in design/drafting, processing process design, NC data creation, etc. It is.

(Prior Art) With conventional graphic input devices, when inputting figures into CAD or CAM, lines are drawn on the CR7 screen, and the lines are combined to create and input figures.

Technical terminology used to express the desired figure, such as APT
While looking at the drawings, they encoded NC data creation terms such as ``in this language'' and input figures.

In inputting a drawing in CAD, an operator selects a command for creating a line prepared in CAD, and creates a line by inputting its coordinates. Then, after drawing a desired figure by combining a number of these lines, input is performed.

In addition, graphic input in CAM is performed by converting the graphics described in the drawing into a program that conforms to the grammar of the graphic expression language.

[Problem that the invention seeks to solve]

Conventional graphic input devices for CAD and CAM input shapes using the dimensions described above, which requires complicated and time-consuming work, and it is difficult to worry about grammatical errors or errors in graphic representation when inputting programs. There were problems such as the need for trained operators to distribute the materials.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a graphic input device that allows graphic input in a short time and is easy to operate.

[Means for solving problems]

A graphic input device according to the present invention is a graphic input device equipped with an image encoding device that binarizes and reads a drawing input from an image input device and then performs point sequence processing to obtain point sequence data. A first means for converting point sequence data into a short line segment vector having a predetermined length and storing the short line segment data in a short line segment data memory, and a first means for displaying the short line segment data on a display device to create a drawing image. a second means for determining the type of line element by inputting feature points on the drawing image, and storing this in a line element data memory as line element data in addition to the short line segment data; Based on the line element data, the coordinates of the points of contact or intersection between the line elements, or the center coordinates in the case of an arc, are determined and added to the line element data using the dimension values of the figure input for each type of line element. and third means for storing the graphic data as graphic data in the graphic data memory.

[Effect]

The graphic data creation device of the present invention creates short line segment data from the point sequence data created by performing point sequence processing after binarized reading, displays this short line segment data on a display device as a drawing image, Input the feature points of the drawing on the display device, determine the type of line element between the feature points, that is, whether it is a straight line or a circular arc, by tracing the short line segment data and change the direction, and then calculate the line represented by the figure. Outputs the constituent elements of as line element data. Furthermore, drawing data is created from the input dimension values and line element data of the figure.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 12.

FIG. 2 is a schematic diagram of a drawing input device showing an embodiment of the present invention. In Fig. 2, (1) is an image input device that inputs a drawing and outputs image data, and (2) is a point sequence data obtained by performing point sequence processing from the image data obtained by the image input device (1). The image encoding device (3) is a graphic data creation device including first to third means newly provided according to this embodiment, and performs main control of the entire graphic input device. Further, (4) indicates a CRT display device, (5) a keyboard, and (6) a mouse, all of which are connected to the graphic data creation device (3).

FIG. 1 is a flowchart for explaining the operation of the graphic input device shown in FIG. The operation will be explained below based on this flowchart.

First, the drawing is binarized and read using the image input device (1) (step 21O), and the drawing is stored as image data in the image data memory (11). Next, noise is removed from this image data (step 220), image reduction is performed (step 230), and line side conversion is performed (step 240), and then continuous image data is subjected to point sequence processing (step 250). ), and stores the obtained point sequence data in the point sequence data memory (12).

All processing from noise removal to point sequence formation is performed by the image coding device (2).

Next, the obtained point sequence data is converted into a short line segment vector of about 0.51101, and this is stored in the short line segment data memory (13) as short line segment data. The process of obtaining short line segment data from point sequence data is called short line segmentation (step 260), and this short line segmentation is executed by the first means in the graphic data creation device (3).

Next, the drawing image divided into short lines in this way is
Display on the RT display device (4) (step 270). Next, using the mouse (6), feature points are input on the graphic image displayed on the CR7 screen (step 280).

Next, the type of line element is determined, and this is stored in the line element data memory (14) as line element data in addition to the previously created short line segment data (step 290). Note that the type of line element here refers to whether it is a straight line or a circular arc, and in the case of a circular arc, it is further determined whether the line element is counterclockwise (CCW) or clockwise (CW). The process of creating line element data from short line segment data in this way is carried out by the second controller in the graphic data creation device (3).
This is done by means of

Next, the detailed dimensions of the figure are input from the keyboard (5), and the type of straight line, ie, horizontal, vertical, or diagonal, and the connection conditions of the line elements are corrected (step 300).

This creates graphic data (step 31O).
, this graphic data is stored in a graphic data memory (15). The process of creating graphic data from line element data is executed by third means in the graphic data creation device (3).

FIG. 3 shows an example of a figure drawn on a drawing that is input to the image input device (1). It is made up of a straight line and a circular arc, and the dimensions of the straight line and the radius of curvature of the circular arc are recorded.

In FIG. 4, short line segments are displayed by (step 270) and C
This figure shows an example of a graphic displayed on the R7 display device (4). In the case of this embodiment, a CR7 display device (4
), the figure is displayed as a series of 0.5 mm straight lines.

FIG. 5 shows (step 280) the CR7 display device (4
) shows the state in which feature points are input to the figure displayed as short line segments. In the figure, “0” indicated by ■ to [phase] is a feature point.

FIG. 6 shows a completed graphic designer whose dimensions have been input in step 300.

The straight lines and arcs are connected in succession, indicating that the input figure shown in FIG. 3 has been reproduced and input into the apparatus.

FIG. 7 is an explanatory diagram showing in an enlarged manner that feature points have been input on the figure displayed as short line segments in (step 270). Arrows in the figure indicate short line segments, and ■ indicates input feature points, respectively.

FIG. 8 is a diagram showing the contents of the short line segment data stored in the short line segment data memory (13). The short line segments have a length of 0.5 ωm, and the starting point and ending point are respectively expressed as X and y coordinates. It is expressed as a vector with

Further, consecutive short line segments have a coordinate relationship such that the end point of one short line segment becomes the starting point of the next short line segment.

When a feature point is input from the mouse (6) on the CR7 display device (4) (step 280), the coordinates of the feature point are determined, a short line segment with the closest starting point coordinates is searched, and this is displayed on the screen. be identified.

FIG. 9 is a diagram showing the contents of line element data stored in the line element data memory (14). The type of line element between a feature point on a continuous short line segment and the next feature point is shown as a line type. Line types include straight lines, CCW arcs, and CW arcs. The line element data shown in this figure is obtained by adding the short line segment data shown in FIG. 8 to this line type. i.e. 1
One line element is represented by x, y coordinates of a starting point and an ending point, and a line type. The coordinates of the start point and end point are obtained from the short line segment data, and the line element type traces the short line segment from the start point to the end point.
It is determined by the change in the direction of the vector.

That is, first, it is determined whether it is a straight line or a circular arc, and if it is a circular arc, it is determined whether the rotation direction is counterclockwise (CCW) or clockwise (CW).

FIG. 1 shows the contents of the graphic data stored in the graphic data memory (15). In other words, the graphic data includes the X and Y coordinates of the start point and end point, the line type, that is, whether it is a curve or a circular arc, and in the case of a circular arc, whether the direction is CCW or CW, and in the case of a circular arc, its center coordinates. Consists of.

To obtain figure data, determine the line type based on the line element data, calculate the coordinates of the points of contact or intersection between line elements from the dimension values of the input figure, and in the case of an arc, the center coordinates. It can be obtained by finding . Here, a detailed explanation will be given of the process of creating line element data from line element data.

FIG. 11 shows a short line segment between feature points indicated by a starting point and an ending point. Here, as shown in Figure 12, focusing on the first short line segment starting from the starting point and the second short line segment following it, calculate the difference between the direction of the first vector and the direction of the second vector. Set it to 01. Similarly, the difference in direction between the second and third vectors is set to 02. In this way, changes in the vector directions of the short line segments from the starting point to the ending point are determined and averaged.

When 1θl<0sL (θ3L is the threshold of θ for determining a straight line) −(2), this line element is determined to be a straight line. Furthermore, if we determine the sign relationship of θ as shown in Fig. 12, when θ>θ3L, we get CCW arc −(:l)θ<θ! When it is IL, it becomes CW arc - (4).

As described above, the figure is determined according to the type of each line element composing the figure of the drawing inputted from the image input device, and the input is completed.

(Effects of the Invention) As described above in detail, according to the present invention, vector data is obtained by segmenting image data converted into a series of points into short lines, and the type of line representing a figure is determined from this vector data. Therefore, there is an effect that graphic input using the graphic input device can be performed easily and by a simple operation.

[Brief explanation of the drawing]

FIG. 1 is a flowchart for explaining the operation of an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a drawing input device according to an embodiment of the invention, and FIG. 3 is a diagram showing figures shown on an input drawing. An example diagram, Figure 4, shows the input figure divided into short lines and CR
Schematic diagram displayed in T, Figure 5 is a schematic diagram with feature points input in Figure 4, Figure 6 is a schematic diagram with the figure displayed after input is completed, Figure 7 is short line segment display and feature point input An explanatory diagram showing
Fig. 8 is an explanatory diagram showing the contents of short line segment data, Fig. 9 is an explanatory diagram showing the contents of line element data, Fig. 1O is an explanatory diagram showing the contents of figure data, and Fig. 11 is an explanatory diagram showing the contents of feature points and the points between them. FIG. 12 is an explanatory diagram showing the relationship between the short line segment and the difference between the short line segment and the vector direction. (1) is an image input device, (2) is an image coding device, (3) is a graphic data creation device, (4) is a CRT display device, (11) is an image data memory, (12) is a point sequence data memory , (13) is a short line segment data memory, (14) is a line element data memory, and (15) is a figure data memory. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a graphic input device equipped with an image encoding device that binarizes and reads a drawing input from an image input device and then performs point string processing to generate point string data, the point string data has a predetermined length. a first means for converting the short line segment vector into a short line segment vector and storing it in a short line segment data memory as short line segment data; and forming a drawing image by displaying the short line segment data on a display device, and displaying feature points on this drawing image. a second means for inputting and determining the type of line element, adding it to the short line segment data and storing it in a line element data memory as line element data; A step that calculates the coordinates of the points of contact or intersection between line elements, or the center coordinates in the case of an arc, based on the dimension values of the input figure, and stores these in the figure data memory as figure data in addition to the line element data. 3. A graphic input device comprising: