JPH02157905A - Picture digitizing method - Google Patents

Abstract

PURPOSE:To exactly execute digitizing even to the part of a fine shape by executing enlarged display to the detail part of the shape which is plotted on a display screen, executing the digitizing to the dot data of the shape, for which the enlarged display is executed, and exactly defining the shape. CONSTITUTION:The shape, which is plotted on a drawing by an image input device 9 such as an image scanner etc., is read and this shape is stored as the dot data to a storage memory 4. Then, these dot data are plotted on the display screen. The digitizing is executed to these plotted dot data by using a graphic cursor 8c, etc., and the definition of the shape is executed. To the detail part of the fine shape, the detail part is enlarged by utilizing drawing enlarge function, which is provided in an automatic programming device, and the digitizing is executed to the enlarged shape. Thus, the fine part can be exactly defined as well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to automatic programming, and more particularly to a method for creating a part program by digitizing dot data of a shape input as an image to define the shape.

Conventional technology In an automatic programming system for creating NC data, points are first created using intermediate symbols.

Define one arc of a straight line (shape definition), define a contour shape using these defined points and one arc of a straight line, define a tool path along the contour shape (motion statement definition), and perform automatic programming. A part program is created in a language, and then the part program is converted into NC data in a format that can be executed by an NC device.

When defining the outline shape of the above product and obtaining a part program, when defining the shape from a freehand drawing of the shape or a drawing of the shape without dimensions, conventionally, the original drawing was placed on a tablet. A method was adopted in which the shape was defined by marking the drawing, tracing the shape drawn on the drawing with a stylus pen, etc., and digitizing it.

Problems to be Solved by the Invention With the conventional method of mounting a drawing on the tablet mentioned above and digitizing the shape drawn on the drawing with a stylus pen, etc., it is not possible to accurately digitize the fine details of the shape. First, it has the disadvantage that it is difficult to define an accurate product shape with few errors.

Therefore, an object of the present invention is to accurately digitize even the smallest details of the shape when defining the shape from a drawing in which the shape is drawn freehand or without dimensions. Our goal is to provide a screen digitizing method that is possible.

Means for Solving the Problems The present invention reads a shape drawn on a drawing with an image input device, draws the shape as dot data on a display screen, and digitizes the drawn dot data to create the shape. The above problem was solved by defining, enlarging and displaying the detailed portion of the shape drawn on the display screen, and performing digitizing on the dot data of the enlarged shape.

The shape drawn on the drawing is read by an image input device such as an operational image scanner, this shape is stored as dot data, and the dot data is drawn on the display screen. The drawn dot data is then digitized using a graphic cursor or the like to define the shape. Further, for a detailed portion of a fine shape, the detailed portion is enlarged using a drawing enlargement function of the automatic programming device, and digitizing is performed on the enlarged shape. As a result, even the smallest details can be defined accurately.

Embodiment FIG. 2 is a block diagram of the main parts of an automatic programming device implementing the present invention.

1 is a processor, 2 is an RO in which a control program is stored
M, 3 is RA that stores defined graphical elements and processing results;
M, 4 is an NC data storage memory for storing created NG data, 5 is a keyboard, 6 is a disk controller, 7 is a graphic display device M (CRT),
8 is a tablet device, 9 is an image input device such as an image scanner, and FL is a floppy disk.

In the tablet device 8, 8a is a tablet surface, 8b
is a menu table, and 8C is a tablet cursor. A menu table 8b is pasted on the tablet surface 8a, and the menu table 8b1. :a Various items and data can be input by picking predetermined items written in with the tablet cursor 8C. Furthermore, by picking on the display screen CRT with a graphic cursor that moves together with the tablet cursor 8C, the picked position can be input.

The image input device 9 is capable of reading a drawn shape from a drawing and storing the shape as dot data.

FIG. 3 is an explanatory diagram showing only the main parts related to the present invention of the menu table 8b pasted on the tablet device 8, and 11 is an item column for starting reading of the drawing from the image input device 9. , 12 is an item column for inputting a shape digitizing command, 13.14.15 is a CRT
This is an item column for instructing enlargement, shifting, and restoration of the drawing drawn on the screen, that is, the shape. Reference numeral 16 is an item column for instructing the shift direction when shifting the screen.

FIGS. 1(a) and 1(b) are operational processing flowcharts of the screen digitizing method in this embodiment.
The explanation will be given according to this flowchart.

It is assumed that the RAM 3 has already stored a system program for defining figures from the floppy FL.

First, the operator sets a drawing on the image input device 9, and uses the tablet cursor 8C to pick the "Start drawing reading J" item 11 from the menu table 8b shown in FIG. is output to the image input device 9, and according to the command, the image input device 9 scans the set drawing, reads the shape drawn on the screen, stores it in the built-in buffer as dot data, and the processor 1 scans the set drawing. The data is read from the buffer and stored in the RAM 3, and the dot data is displayed on the screen of the CRT 7 to draw the shape.Therefore, when the operator clicks the "Digitizing" item 12 on the menu table 8b with the tablet cursor 8C, the processor 1
starts the process shown in FIG. 1(a), displays on the CRT screen a question requesting the input of the coordinate values of the starting point during digitizing, and the starting point is input (steps 81 and 82).

When the operator operates the tablet cursor 8C in response to the displayed question and moves the graphic cursor on the CR7 screen to start the start point, it will check whether the digitizing end command has been input and the line displayed on the CRT screen. It is monitored whether a minute or an arc has been specified with the graphic cursor and has been ticked (step 33.84). Although it is briefly illustrated in the chart 70 in FIG. 1(a), the processor 1 repeatedly performs the processing in steps 83 and 84, and when an end command or line segment designation 1 arc designation is input, We are determining whether or not it was done.

When the arc is checked, the processor 1 displays on the CRT screen a question requesting input of the coordinate values of the midpoint of the arc (step S5), and the midpoint is input (step S6). The operator moves the graphic cursor to the midpoint of the arc from among the shapes drawn with the data on the CRT screen and jumps. When the intermediate point is thus input, the processor 1 displays a question requesting input of the coordinate value of the end point on the CRT screen (step 87). Note that if the line segment is jumped in step S4, step S5. The process proceeds to step S7 without performing the process of S6.

When the operator checks the end point in the same manner as described above (step S8), the processor 1 generates a straight line passing through the two checked points if a line segment is specified, or a circle passing through the three checked points if an arc is specified. is defined and its canonical form is stored in RAM 3 (step 89). That is, for a line segment, the coordinate values of the starting point and ending point of the line segment, the unit vector and length of the normal line perpendicular to the line segment from the origin, and for an arc, the coordinate values of the starting point and ending point of the arc, and the length of the normal line perpendicular to the line segment from the origin. Memorize center coordinates and radius. Then, in step 5, it is determined whether or not the coordinate value that was jumped as the start point of digitizing in step $2 and the coordinate value that was jumped as the end point in step S8 match, that is, whether the digitizing has been completely completed.
10) If they do not match, the process returns to step S3 again, and the same process as described above is performed using the previous end point as the current digitizing start point, and the drawn shapes are sequentially digitized. In this way, the digitizing process ends when it is determined in step S10 that the coordinate values of the start point and the end point match, and also ends when it is determined that an end command has been input in step S3.

On the other hand, if you want to accurately define the details of the shape,
The drawing drawn on the CRT screen is enlarged and shifted, and digitizing processing is performed. In other words, "
When you use the tablet cursor 8C to start the "Screen Enlargement" item 13 and specify the two diagonal corners of the rectangle indicating the area to be enlarged using the graphic cursor, an interrupt is generated and the processor 1 displays the screen as shown in FIG. 1(b). Then, screen enlargement processing is started to enlarge the specified area and draw it on the CRT screen. Also, when shifting the screen, use the tablet cursor to jump to "Screen Shift" item 14 on menu table 8b, and select item 1 with an arrow indicating the shift direction.
When you select one of 6 and jump, the screen shifts in the specified direction. Furthermore, to return the enlarged screen to the original screen, click the [Screen Restoration J] item. The screen enlargement, nine-screen shift, and screen restoration processes are performed by interrupt processing, as shown in FIG. 1(b). Since the specific processing is already well known, detailed explanation will be omitted.

In this way, if the screen is enlarged and shifted by two screens to enlarge the detailed parts of the shape, and the process shown in FIG. Since the coordinate values do not change, the shape can be sampled (big) in detail, and detailed shapes can be accurately digitized and defined. In addition, if the drawn line width becomes larger by enlarging the screen, the operator can change the line width as desired by expanding the inner contour of the line width and defining it, or by expanding the outer contour and defining it. Shapes can be defined.

Effects of the Invention The present invention, when defining a shape from a drawing in which a freehand drawn shape or a shape without dimensions is drawn, reads the shape with an image input device and displays the obtained dot data on a display screen. , and digitizing is performed on the shape drawn on the display screen, and the detailed parts of the shape are enlarged on the screen and digitized on the enlarged shape. Shape definition is possible. As a result, NC data can also be easily and accurately created based on the data defined in this way.

[Brief explanation of the drawing]

1(a) and 1(b) are operational processing flowcharts of one embodiment of the present invention, FIG. 2 is a block diagram of main parts of an automatic programming device implementing the same embodiment, and FIG. FIG. 3 is an explanatory diagram of main parts of a menu table provided on the tablet device in the example. 1...Processor, 2...ROM, 3...RAM
18...Tablet device, 8b...Menu table, 8
C...Tablet cursor, 9...Image input device.

Claims (1)

[Claims] In an automatic programming device, a shape drawn on a drawing is read by an image input device, the shape is drawn as dot data on a display screen, the drawn dot data is digitized to define the shape, and the shape is defined on the display screen. A screen digitizing method in which detailed parts of the drawn shape are enlarged and the dot data of the enlarged shape is digitized to accurately define the shape.