JPH055131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a figure input device that allows figures to be input online by hand when inputting figures into a CAD (Computer Aided Design) system.

[Technical background of the invention and its problems]

When inputting figures into a CAD system, especially figures used in mechanical drawings, with conventional equipment, you have to select and combine dozens of different and similar commands via a tablet and keyboard, and then precisely specify the coordinate position of the figure you want to input. I had to specify it. Therefore, unless the operator is familiar with the operation method, it takes a lot of time and puts a heavy burden on the operator. Furthermore, since two devices, a keyboard and a tablet, must be operated, the space efficiency of installing the devices is poor.

[Purpose of the invention]

The present invention has been made to overcome the drawbacks of the prior art described above, and is a space-efficient system that can be easily operated even by a designer who is not familiar with operating CAD systems, and that can be installed on a designer's desk. The purpose of this invention is to provide a graphic input device.

[Summary of the invention]

The present invention provides handwritten character recognition, handwritten figure recognition,
By combining the proximity calculation between figures,
This is a graphic input device that internally recognizes instructions equivalent to conventional commands, calculates the coordinate position of an input graphic internally, and generates a clean drawing from handwritten characters and graphics.

[Example of drawing]

FIG. 2 shows the overall configuration of the drawing input device according to the present invention. Figures and characters are input by handwriting on the tablet 12 using a stylus pen 13. The CRT 11 displays the recognition result of the input handwritten characters, the handwritten input figures or the figures after the cleanup process, and also displays several command menus. The plotter 14 outputs a faired drawing. The graphics input device main body 10 recognizes characters or graphics based on the coordinate data sent from the tablet 12. A detailed representation of this part is shown in FIG. In character recognition, perform character recognition processing
CREC103 operates, and in figure recognition, pick detection unit PICK102, figure recognition unit 104, proximity calculation unit DIST105, coordinate value calculation unit LOC10
6. End point and contact calculation section that calculates end points and contact points
TREQ107 operates. Coordinate value input section other than these IN100, stroke end detection section SDET1
01. Graphic memory MEMOKY108, display control unit DSP109 that controls the CRT display, plotter control unit PLOT110 that controls output to the plotter.
is a part that operates in common to character recognition and figure recognition.

The operation of the present invention will be described with reference to an example of graphic input shown in FIG. Figure 3 a shows a straight line L connecting the intersection A of straight lines L1 and L2 and the intersection B of straight lines L3 and L4.
This is an example of inputting 5.

In the conventional device, in order to specify point A, a command to specify the intersection between straight lines is input from the keyboard (F1 in Figure 5), and then the stylus pen of the tablet is moved to move the cursor to line L1 and L2. (F3 in Fig. 5, called pick). Point B is similarly determined by the above operation.
Next, a command for inputting a straight line is input from the keyboard (F1 in FIG. 5), and a subcommand indicating that the input specifies a starting point and an end point is input from the keyboard (F2 in FIG. 5). To specify the starting point and ending point, move the cursor to match the above two points A and B (F3 in Fig. 5). When the above operations are completed, the straight line L5 to be input is displayed on the CRT (F4 in Figure 5).

On the other hand, in the present invention, the stylus pen 13 is moved on the tablet 12, the cursor displayed on the CRT 11 is moved near a point, the pen is moved down, and the cursor is moved to point B in the same way as when writing with a pen. There is no need to input or pick commands using conventional equipment. The operation of the present invention when this operation is performed can be determined with reference to FIG. The coordinate values of the stylus pen 13 input via IN100 are input to PREQ10.
4. Pass it to DIST105. This value is also DSP1
09 to the CRT 11 to display the handwritten figure.

The fact that I put the pen down at point A and started writing is SDET.
101 detects and sends to PREQ104 and DIST105,
Sends a signal to start each operation. DIST1
05 accesses the MEMOKY 108 in which other graphic data for the straight lines L1 to L4 that have already been input is stored, calculates the distance between the coordinate values after the pen is down and the straight lines that have already been input (i.e., L1 to L4), and calculates the result. is sent to TREQ107. PREQ 104 inputs the coordinate values of stylus pen 13 via IN 100 and calculates the stroke vector of the handwritten figure.
When the stylus pen 13 is brought up near point B, the SDET 101 detects that writing has finished,
This is notified to DIST 105 and PREQ 104. DIST 105 ends its operation upon pen-up. TREQ107 starts writing from the coordinates close to the end point of straight line L1 or L2 from the distance sent from DIST105, recognizes that it has finished writing at the coordinates close to the end point of straight line L3 or L4, and sets the coordinates of the start and end of writing. LOC the value as points A and B
Send to 106. PREQ 104 recognizes the shape of the input figure from the calculation result of the stroke vector. In this example, it is recognized as a straight line. A code representing the graphic format of the recognition result is sent to the LOC 106. LOC106 is
The graphic code sent from the PFEQ 104 is a straight line, and from the two coordinate values sent from the TREQ 107, that is, the coordinate values of points A and B, it is determined that it is a straight line whose starting and ending points are the two coordinate values. This data is stored in MEMORY 108 and
It is sent to the CRT 11 via the DSP 109, and the handwritten figure that had been displayed up to that point is erased and the clean-cut figure is displayed.

FIG. 3b is an example in which a circle that is in contact with two straight lines L6 and L7 and whose radius value is 100 is input. As with straight line input, move the stylus pen 13 to input straight lines L6, L.
Input the circle close to 7 by hand. The value of the radius is inputted in the same way as writing with the stylus pen 13. The first character R is an identification character indicating that the numerical value is a radius. The character input and graphic input may be the reverse of the above. As with straight line input, there is no need to pick the straight lines L6 and L7, and there is no need to input numerical values from the keyboard.

The operation of the present invention when performing this operation will be described with reference to FIG. 1 in the same way as for linear input. IN100
The coordinate values of the stylus pen 13 input through
Pass to PREQ104 and DIST105. DSP109
Displaying a handwritten figure on the CRT 11 via the input line is the same as the example of linear input. PREQ104 calculates the stroke spectrum during pen down and DIST
calculates the distance to the already input shape data stored in MEMOKY108 and uses this result.
Send to TREQ107. TREQ indicates that the handwritten input figure was written close to straight lines L6 and L7.
Send to LOC107. CREQ 103 obtains strokes from the coordinate values of stylus pen 13 and performs character recognition. The character recognition technology itself is described in publicly known examples (Nikkei Collectronics 1983, 12, 5, PP115-133). Character string R100 by character recognition
When , it recognizes that the following character is the radius value from the letter R, and sends the radius value 100 to the LOC 106 . LOC106 receives the data of straight lines L6 and L7 sent from TREQ107, the radius value 100 sent from CREQ104, and PREQ104.
Since the figure code sent from the source is a circle, the point E, which is a distance of 100 from the straight lines L6 and L7, is found, that is, the center point. This result is sent to the CRT 11 via the DSP 109, and a circle with a radius of 100 that touches the straight lines L6 and L7 is formatted and displayed. These coordinate values are stored in MEMORY 108. The numerical input in this example is the radius of the circle, but other numerical values such as the diameter of a circle or arc, coordinate values in a rectangular or polar coordinate system, the length of a straight line, and the distance from a reference line are also possible.

FIG. 3c shows an example of tangent line input when the figures that have already been input are close to each other, and there are figures that are close to each other, making it difficult to identify them or causing a risk of erroneous recognition. At this time, the graphic pick operation is performed in the same way as in the conventional device. First, the stylus pen 13 is moved, the cursor is placed on the circumference of the circle C2, the pen is brought down at point F, and the pen is brought up again. The same thing is done for circle C4 as well. Next, a handwritten figure is started from a position near the tangential coordinates of the circle C2, and finished at a position near the tangential coordinates of the circle C4. The command for tangent to a circle in the conventional device is unnecessary. The operation of the present invention when this operation is performed will be described with reference to FIG. SDET101 detects pen down and pen up at point F, and DIST105 detects
Input the coordinate values of the stylus pen 13 via IN100, access the MEMORY108 in which the circles C1 to C4 and other figures that have already been input are stored, calculate the distance between the point F and these figures, and calculate the distance between the point F and these figures. Send the result to TREQ107. PICK102 sends pen down and pen up on and off signals to SDET1
It is determined that this is a pick operation based on the amount of movement of the coordinate values of the stylus pen 13 received from IN 100 and input from IN 100, and this is sent to TREQ 107.
TREQ 107 recognizes from these actions that circle C2 has been picked. Furthermore, when the pen down and pen up operations are performed at point G, the same operation as above is performed. Next, start writing near the tangent coordinate of circle C2,
PREQ1 until it finishes writing near the tangent coordinate of circle C4
The operations of 04, DIST 105, and TREQ 107 are almost the same as in the linear input example. The difference is that since the pick operation has already been performed, the distance calculation of DIST 105 is first performed for circles C2 and C4, and that TREQ 107 determines the tangential coordinates of circles C2 and C4. For LOC106, the figure code sent from PREQ104 is a straight line,
From the tangent coordinate values of the circles C2 and C4 sent from the TREQ 107, it is determined that it is a straight line with the two coordinate values as the starting point and ending point.

〔Effect of the invention〕

According to the graphic input device of the present invention, by recognizing online handwritten characters, a keyboard is not required, and also by recognizing online handwritten input figures, the degree of proximity between the handwritten figures and the already input figures is calculated. Therefore, it has the effect of dramatically improving graphic input speed and operability compared to conventional devices.

[Brief explanation of drawings]

FIG. 1 is a detailed block diagram of the main body of the graphic input device of the present invention, FIG. 2 is a block diagram of the graphic input device of the present invention in which the main body and the input device are combined, and FIG. 3 is a block diagram showing the main body of the graphic input device of the present invention in detail. A diagram showing an example of displaying a figure input to a figure input device, FIG. 4 is based on the conventional technology
Equipment configuration diagram related to figure input of CAD system,
FIG. 5 is a flowchart of a graphic input operation using the device shown in FIG. 1...CAD system processing device, 2...CRT, 3
…Keyboard, 4…Tablet, 5…Protector,
10...Graphic input device body, 11...CRT, 12...
Tablet, 13... Stylus pen, 14... Plotter, 100... Coordinate value input section, 101... Stroke end detection section, 102... Pick detection section, 103... Character recognition section, 104... Graphic recognition section, 105... Proximity calculation section, 106... Coordinate value calculation unit, 107... End point,
Contact calculation unit, 108...Graphic memory, 109...Display control unit, 110...Protester control unit.

Claims (1)

[Scope of Claims] 1. A graphic input device for inputting handwritten figures from a tablet, comprising: means for reading first coordinate values that are input moment by moment by drawing figures on the tablet; means for reading the inputted figure information from the input figure and calculating the distance to the first coordinate value to determine a figure close to the input figure; and means for determining the shape of the input figure from the first coordinate value. , means for determining second coordinate values regarding the end points or contact points and shape of the figure to be fine-written from the determined proximate figure and the shape of the input figure, and storing this in the memory; and handwriting using the first coordinate values. A graphic input device comprising means for displaying a graphic and a faired graphic using second coordinate values. 2. In a graphic input device that inputs handwritten figures, etc. from a tablet, means for reading the first coordinate values that are input from time to time by writing characters or figures on the tablet, and input already stored in the memory. means for reading the completed figure information and calculating the distance to the first coordinate value to determine a figure close to the input figure; means for determining the shape of the input figure from the first coordinate value; and means for determining the shape of the input figure from the first coordinate value; If input, a means for determining the handwritten character from the first coordinate value, and an edge line or contact point of the figure to be transcribed and shape size based on the proximate figure, the shape of the input figure, and the content of the determined character. means for determining the second coordinate values for and storing them in the memory, and means for displaying a handwritten figure etc. based on the first coordinate values and a fair-written figure etc. based on the second coordinate values, respectively. A graphic input device characterized by: