JPS621072A - Graphic input device - Google Patents

Abstract

PURPOSE:To improve both the input speed and input operability of patterns by combining the recognition of handwritten characters, the recognition of handwritten graphics and the calculation of approximation degree between graphics. CONSTITUTION:The input of graphics and characters is carried out manually on a tablet 12 by means of a stylus pen 13. A CRT 11 displays the result of recognition of the handwritten input characters and the handwritten input graphics or their fair copies. A plotter 14 delivers the fair copies of drawings. A graphic input device main body 10 actuates a character recognizing part 103 for recognition of characters and then actuates a peak detecting part 102, a graphic recognizing part 104, an approximation calculating part 105, a coordinate value calculating part 106 and an end point/contact point calculating part 107 for recognition of graphics respectively. While a coordinate value input part 100, a stroke end detecting part 101, a graphic memory 108, a CRT display control part 109 and a plotter control part 110 are actuated together for recognition of both characters and graphics.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a CAD (Computer Aided D
esign) System C: A graphic input device that allows the graphic to be entered online by hand when inputting a graphic (2 related systems).

[Technical background of the invention and its problems] When inputting figures, especially mechanical drawings, in CAD systems, conventional devices require multiple selection of dozens of diverse and similar commands via a tablet and keyboard. Moreover, in addition to combining them, it was necessary to specify the exact coordinate positions of the figures to be input. 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, had to be operated, the space efficiency of installing the devices was poor.

[Object of the Invention] The present invention has been made to overcome the drawbacks of the prior art described above, and is easy to operate even by a designer who is not familiar with operating a CAD system, and is easy to use on a designer's desk. The purpose of the present invention is to provide a graphic input device that can be installed with high space efficiency.

[Summary of the Invention] By combining handwritten character recognition, handwritten figure recognition, and proximity calculation between figures, the present invention recognizes within the device an instruction that corresponds to a conventional command, and also calculates the coordinate position of an input figure within the device. Character 9 calculated and handwritten
This is a graphic input device that generates clean drawings from 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. CRTI
I displays the recognition results of the input bare handwritten characters, the handwritten input figures or the figures after the cleanup process, and also displays several command menus. The plotter 14 outputs a fair drawing. The graphic input device main body 10 recognizes the coordinate data sent from the tablet 12 as characters or solids. A detailed representation of this part is shown in FIG. In character recognition, the CRBC 103 that performs character recognition processing operates, and in graphic recognition, a BIC detection unit PICK 102, a graphic recognition unit PREQ 104, and a proximity calculation unit DIET I operate.
Q5.

A coordinate value calculation unit LOCIQ5 and an end point and contact calculation unit TREQ 107 that calculate end points and contact points operate. Coordinate value input section lN100 other than these, stroke end detection section 5D
ET101, graphic memory MEMOKY 108, CRT
A display control unit DSP 109 controls the display of the plotter, and a plotter control unit PLOT 110 controls output to the plotter.
is a part that operates in parallel with character recognition and graphic recognition C.

The operation of the present invention ζ2 will be described with reference to an example of graphic input shown in FIG. Figure 3 (a) shows straight lines L1 and L20] Intersection A
In this example, a straight line L5 connecting the intersection point A2 of straight lines L3 and L4 is input.

In the conventional device, in order to first specify the point A1, the intersection point between the straight lines must be entered from the command keyboard (P''l in FIG. with the cursor (7th
(F3 in the diagram is called Big).

Point A2 is similarly determined by the above operation. The shocked figure is highlighted on the CRT (p4 in Figure 7). Next C: Enter the command to input a straight line from the keyboard (W, Fl in Figure 7), and enter the subcommand from the keyboard to indicate that the input specifies the start and end points (N7).
F2 in the figure). To specify the start point and end point, move the cursor to match the above two points Al and Person 21 (F3 in Figure 7)
. When the above operations are completed, the straight line L5 that you want to input will appear on the CRT.
(The knee is displayed (F4 in Figure 7).

On the other hand, in the present invention, the stylus pen 13 is moved on the tablet 12, and the displayed cursor is brought to the vicinity of point A1 by cRTII+2. , when you raise the pen here, the clean-cut straight line L5 is displayed on the CRT II (2). In this way, there is no need to enter commands or read with the conventional device. This will be described with reference to the figure.The coordinate values of the stylus pen 13 input through the IN100 are expressed as PREQ10.
4. Pass to DIST 105. This value is also D8
It is sent to the CRTII via P109 and the handwritten figure is displayed.

What I bent down at point A1 and started writing is 5DET10
1 is detected and sends a signal to pREQ 104 and DIST 105 to start their respective operations.

The PREQ 104 samples and inputs the coordinate values of the stylus pen 13 via the IN 100 at regular time intervals, and calculates the stroke vector of the handwritten figure and the rate of change of the coordinate values. If the absolute value of the rate of change exceeds a predetermined threshold, this is notified to the DIST 105.

The DIST 105 accesses the MEMORY 108 in which the already input straight lines L1 to L4 and other figure data are stored, calculates the distance between the coordinate values after the pen is down and the straight line that has already been done manually (i.e. Ll-L4), and calculates the distance between the coordinate values after the pen is down and the straight line (i.e. Ll-L4) that has already been set manually. Figure data whose distance is less than the threshold value (in this example, Ll
, L2) and the distance to 'rRhQ 107. When the stylus pen 13 is raised near point A2, the 8DET 101 detects that writing has finished, and indicates this to D.
Notify I8T105 and PREQ104.

D18T105 ends its operation by pen-up.

TREQ 107 uses the graphic data and distance sent from DIST 105 to start writing from the coordinates close to the end point of straight line L1'F or L2, and finish writing at the coordinates close to end point C of straight line L3 or B4. Recognize and set the coordinate values of the start and end of writing as points Al and A2 as LOC106
send to 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. LOC10 is a code that represents the graphical format of the recognition result.
Send to 6. LOC106 indicates that the graphic code sent from PRBQ104 is a straight line, and that it is a straight line whose starting and ending points are the two coordinate values sent from TRgQ107, namely the coordinate values of points Al and A2. judge. This data is stored in the MEMORY 108 and is also sent to the CRTII via the DSPIQ9 to erase the handwritten figure that had been displayed up to that point and display the clean-cut figure.

FIG. 3(b) shows two straight lines L6. Touching L7 and radius value is 1
This is an example of inputting 00 yen. As with the straight line input, move the stylus pen 13 to input the straight line L6. B7 i- Input adjacent circles by hand. It doesn't matter where you start writing. The radius value is the stylus pen [3
In the same way as writing with a pen (2) and inputting a numerical value.The first character R indicates that the numerical value is a radius and is a T identification character.The character input and graphic input may be the reverse of the above. No. Similar to straight line input, there is no need for the big lines L6 and L7, and there is no need to input numerical values from the keyboard.

The operation of the present invention when this operation is performed will be described with reference to FIG. 1 as in the case of linear input. The coordinate values of the stylus pen 13 input via lN100 are PRgQ 104 ,
To DIST 105 #, ding. 1) Displaying a handwritten figure on the CRT II via the SP 109 is the same as the example of linear input. PREQ 104 calculates the stroke vector during pen down, DIST MEMORY 108
The distance to the already input graphic data stored in the TRBQ 107 is calculated and the result is sent to the TRBQ 107.

In TREQ, the handwritten input figure is a straight line L6. Sends what is written near L7 to LOC106. The CRBC 103 determines a stroke from the coordinate values of the stylus pen I3 and performs character recognition. The character recognition technology itself is a known example (Nikkei Electronics 1983.12.5. PpH5-13
3) etc. C: Written. Character string R1 by character recognition
When 00 is found, it is recognized that the characters following the letter R are the radius value, and the radius value 100 is sent to the LOC 106. LOC106 uses the data of straight line L6.L7 sent from TREQI(17), the radius value 100 sent from CREQ 103, and the figure code sent from PRgQ 104 as a circle, so it is the straight line L6.L7.
Find a point B at a distance of 100 from L7, that is, the center point. This result is sent to CRTII via D8P109 and straight line L6. L7i- A circle with tangent radius 1()0 is formatted and displayed. This coordinate value is 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 can also be input.

Next, there will be described a method for determining adjacent figures based on the rate of change of the coordinate values of the stylus pen 13 (two methods will be described below). FIG. Handwriting input begins close to the end A3 of the straight line L8, and finishes close to the end A4+ of the straight line L9.However, in this example, there are circles C2 and C3 near the passing point of the handwritten trajectory, and there are tangents to these circles. There is a risk of it being mistakenly recognized as an input.A3
．． When inputting a straight line connecting A4, input by hand so that the moving speed of the stylus ben 13 is as constant as possible at the passing points, as shown in FIG. 4(b). Figure 4 (
C) is a diagram showing the acceleration of the stylus pen. A3
There are peaks at the beginning of writing near A4 and at the end of writing near A4.

The operation of the present invention when this operation is performed will be described with reference to FIG. The coordinate values of the stylus pen 13 input through IN100 are PREQ104, DISTI0
Pass it to 5. L) Handwritten figures on CRT via SP109
II(; The display is the same as in the embodiment of FIG. 3.

PREQ 104 calculates the stroke vector during pen down and also determines the rate of change in C stylus pen coordinate values. If the absolute value of acceleration exceeds a predetermined threshold value, the rising point (Bl in FIG. 4(C)).

1) Notify the IST 105 in B2).

The DIST 105 calculates the distance to the already input graphic data stored in the MEMORY 108. In this example, straight lines Lg, B9 and circles C2 and C3 are selected as proximal figures and sent to TRBQ 107. Straight line L8. Since only one L91 has received notification of a rising signal from PREQ 104, priority selection data is added. .

TREQ107 generates a straight line L8 from the figure data sent from DIST105 and additional data of distance and priority selection.
It recognizes that it starts writing at end A3 of straight line L9 and finishes writing at end A4 of straight line L9, and sets the coordinate values of the start and end of writing to A3.
．． Send it to LOC 106 as A4.

PREQ 104 recognizes the shape of the input figure as a straight line from the calculation result of the stroke vector and sets the figure code to LOC10.
Send to 6.

For LOC106, the figure code sent from PREQ104 is a straight line, and the figure code sent from TREQ107 is a straight line.
coordinate values of point A3. From the coordinate values of A4, it is determined that it is a straight line with two coordinate values as the starting point and ending point. The subsequent operations are the same as the embodiment shown in FIG. 3(a).

Although FIG. 4 shows an example of inputting a straight line connecting the ends of a straight line, an example of inputting a tangent line at almost the same position will be described with reference to FIG. In this example, as shown in FIG. 5(b), the moving speed of the stylus pen 13 is varied near the circumferences of circles C2 and C3 forming tangent lines. FIG.

Start writing B3. At the end of writing B6 and when passing near circles C2 and C3 B4. I have a B5i Ubiq. B4. The peak immediately after B5 is ignored as a dead zone.

The operation of the present invention when this operation is performed will be described with reference to FIG. The operation of IN 10(+, DSP 10g is the same as the previous addition example. PREQ 104 calculates the stroke vector during pen down and (2,
The rate of change of the stylus pen is determined and the timings B3 to B6 shown in FIG. 5(C) are notified to the DIST 105.

The DI8T 105 calculates the distance from the MEMORY 1081 to the stored graphic data that has already been input. (Same as the example of adding two, select the straight line L8.L9, circles C2 and C3 as proximate figures, and send to TREQI(+7. Circle c2
．． Regarding C3, since a rising signal has been notified from PRBQ 104, priority selection data is added to these, contrary to the example shown earlier.

TREQ 107 recognizes from the graphic data sent from DIS'r 105 and the additional data of distance and priority selection that the circle C2 and Cal are bitangential, and calculates the coordinate values of the start and end of writing, the adjacent figure L8. L9゜C2
, C3 is sent to the LOC106. Priority selection data is added to C2 and C3.

LOCIQ5 generates tangents to circles C2 and C3 from the figure code sent from PREQ 104, that is, the straight line, and the data related to the adjacent figure C'' sent from TREQ 107. Therefore, the starting point and ending point are determined to be the points closest to the W start and end coordinates C''' of the handwritten trajectory.

The subsequent operations are the same as the embodiment shown in FIG. 3(a).

In the embodiments shown in FIGS. 4 and 5, PREQ 104 indicates DIS when the acceleration of stylus pen 13 exceeds the threshold value.
I mentioned sending a signal to T105, but stylus pen 13
The same signal may be sent to the DIST 105 if the moving speed of the stylus pen 13 becomes less than a predetermined threshold value even if the acceleration of the stylus pen 13 is less than a threshold value.

[Effects of the Invention] The graphic input device according to the present invention eliminates the need for a keyboard by recognizing online handwritten characters (2. Recognizing online handwritten input figures and matching the handwritten figures with already input figures) Since proximity is calculated, it has the effect of dramatically improving figure input speed and operation requirements compared to conventional devices.In particular, priority is given to recognition of proximal figures according to the rate of change of stylus pen coordinate values. Therefore, even when inputting further figures to a place where already inputted figures are close to each other, it is possible to input them correctly without erroneously recognizing them.

[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 FIGS.
The figures are diagrams showing an example of the display of a figure input to the figure input device of the present invention and an example of the moving state of the stylus pen. Figure 6 is a diagram showing the configuration of related equipment for CAD system 1 according to conventional technology C. 6 is a flowchart of a graphic input operation using the apparatus I shown in FIG. 1°゛・CAD system processing device 2...CRT3
...Keyboard 4...Tablet 5...Plotter 10...Graphic input device body 11...C
R, T 12...Tablet 13...
Stylus pen 14... Plotter 100... Coordinate value input section 101... Stroke end detection section 102... Bic detection section 103... Character recognition section 1
04...Graphic recognition unit 105...Proximity calculation unit 1
06... Coordinate value calculation unit 107... End point, contact calculation unit 108... Graphic memory 109... Display control unit 11
0...Plotter Control Department Agent Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A figure input device for inputting handwritten figures from a tablet, comprising: means for reading first coordinate values of figures on the tablet; means for detecting a rate of change of the first coordinate values; means for reading the inputted figure information and calculating the first coordinate value to determine a figure close to the input figure; and means for determining a figure close to the input figure based on the rate of change; A graphic input device comprising: means for determining second coordinate values; and means for storing the contents determined by the respective means in the memory and displaying the formatted graphic.