JPH03263281A - Handwritten line graphic input device - Google Patents

Abstract

PURPOSE:To improve the degree of freedom for handwrite and to separate characters and graphics with high accuracy by displaying or erasing a character frame while deciding the circumscribed rectangle of a stroke as a character or graphic stroke corresponding to whether a length (l) of a long side in the rectangle is less or more than a threshold value. CONSTITUTION:When the starting position of the first stroke in the character is written down by a pen, a processing circuit 402 writes the character frame of one character in a size set in advance through an interface circuit 405 to a frame memory 5 with the coordinates of the position as a center, and writes a straight line linking those coordinate points into a memory 5. On the other hand, a control circuit 6 sends out the contents of the memory 5 to a display 2 at fixed cycles. The circuit 402 calculates the length (l) of the long side in the frame of the circumscribed rectangle to the stroke according to the respective coordinates of the first stroke, and compares the calculated length with the threshold value to be decided from the character frame. Corresponding to whether the length (l) is less or more than the threshold value, the stroke is decided as the character or the graphic. When the stroke is decided as the character, the central position of the character frame is moved to the central position of the stroke circumscribed rectangle and displayed 2. On the other hand, when the stroke is decided as the graphic, the character frame is erased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a handwritten line diagram type input device using an input display integrated coordinate input device in which an input section and a display section are integrated.
In particular, the present invention relates to a handwritten line figure input device that can separate input line figures into characters or figures on a stroke-by-stroke basis.

[Prior art]

Conventionally, this type of technology was disclosed in Japanese Patent Application Laid-Open No. 60-204089.
There is something disclosed in the issue. This technology divides the input surface of the input/display integrated coordinate input device into grid-like squares of preset size, and divides the projected length of the input stroke onto the X and Y axes, for example. Find the maximum projection length, compare this maximum projection length with a predetermined threshold, and if the projection length is smaller than this predetermined threshold, enter character stroke, i.e. character recognition mode, and the maximum projection length is greater than this threshold. At this time, the graphic recognition mode is set, and regarding character strokes, the first stroke of the same character is treated as the stroke of the same character, and segmentation of one character is performed.

[Problem to be solved by the invention]

However, with the above-mentioned conventional method of first writing characters on a preset day on the input screen, the disadvantage is that the number of characters and character spacing is limited, or the size of the characters cannot be changed arbitrarily depending on the location. There was also a drawback that characters could not be written at arbitrary positions on the figure to be written.

The present invention has been made in view of the above-mentioned points, and it eliminates the above-mentioned problems, allows characters of a desired size to be written at desired intervals on an input surface, and also allows the strokes constituting one character to be written at any position on an input surface. To provide a handwritten line figure input device which can accurately separate strokes from other strokes, has a high degree of freedom in handwriting, and has a highly accurate character and figure separation function and a single character cutting function.

[Means to solve the problem]

In order to solve the above problems, the present invention has configured a handwritten line figure input device as follows.

One stroke is from pen down to pen up, and when the pen is down, a character frame centered at that position is displayed, and 1
Each time a stroke is input, the length 2 of the long side of the circumscribed rectangle of the input stroke is compared with a threshold determined from the size of the character frame, and when the length 2 is less than the threshold, the stroke is recognized as a character stroke. At the same time, the center position of the character frame is moved to the center position of the stroke circumscribing rectangle and displayed. If the length l is greater than or equal to the threshold value, the stroke is determined to be a figure stroke, the character frame is erased, and when the pen is down, When the start point of the stroke is located within the displayed character frame, the start point of the stroke is determined to be the start point of the character stroke, the character frame continues to be displayed, and the start point of the stroke when the pen is down is displayed. When the character frame is located outside the existing character frame, the currently displayed character frame is erased and a new character frame centered at the starting point of the stroke is displayed.

Further, the size of the character frame is formatted in advance in accordance with the position on the display surface.

[Effect]

According to the present invention, the length L of the long side of the circumscribed rectangle of the stroke
If the length is less than the threshold determined by the size of the character frame, the stroke is determined to be a character stroke, and the center position of the character frame is moved to the center position of the stroke circumscribing rectangle and displayed. If it is determined to be a figure stroke and the character frame is erased, and the start point of the stroke when the pen is down is located within the displayed character frame, the start point of the stroke is determined to be the character stroke start point and the character frame display continues. However, if the start point of the stroke when the pen is down is located outside the displayed character frame, the displayed character frame is erased and a new character frame centered at the stroke start point is displayed, so the user can It is now possible to input characters or shapes by hand while looking at the displayed character frame, and if you write the characters too large or the shapes too small, the characters may be judged as figures or the figures may be judged as letters. It is possible to prevent entry errors such as In addition to being able to separate characters and figures and obtain information separated for each character, it is also possible to write characters of a desired size in any position at a desired interval.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of a handwritten line figure input device according to an embodiment of the present invention. The handwritten line figure input device is comprised of a stylus pen 1, a liquid crystal display 2, a tablet 3, a link section 4, a frame memory 5, a display control section 6, and a keyboard input section 7, as shown in the figure.

The liquid crystal display 2 and the tablet 3 are integrally constructed to constitute a known input/display integrated coordinate input device.

As shown in the figure, the processing section 4 includes an input interface circuit 401, a processing circuit 402, a coordinate memory 403, a stroke memory 404, and a frame memory interface circuit 405.

The input interface circuit 401 is an interface circuit that inputs coordinate data from the tablet 3, and the processing circuit 402 performs processing to determine strokes as characters or figures under the control of a microprogram, and draws character frames and strokes in frame memory. The coordinate memory 403 is a coordinate memory for storing the coordinates of each point of a stroke. Further, a stroke memory 404 is a memory for storing information such as determination results of nine characters and figures for each stroke, and a frame memory interface circuit 405 is an interface circuit for outputting drawing data to the frame memory 5.

When you touch (pen down) the surface of the liquid crystal display 2 with the electromagnetic induction stylus pen 1, the electromagnetic tablet 3 detects the position and displays its coordinate value (X
, Y) and data such as pen-up/pen-down of the stylus pen 1 are sent to the processing unit 4.

When the processing circuit 402 of the processing section 4 receives the above data sent from the tablet 3 via the input interface circuit 401, it executes the following processing under the control of a microprogram. The operation at this time will be explained using FIG.

Figures 3 (A) to (C) show changes in the display contents on the liquid crystal display 2 when the character "A" is input in the order of the first stroke (A) and the second stroke (-). ,
When the starting point position of the first stroke is pen-down (pen-touched) (see FIG. 4(a)), the processing circuit 402 sets a preset size of 1 with the coordinates (X, Y) as the center. The character frame CF of the character is written into the frame memory 5 via the frame memory interface circuit 405, and subsequent coordinate data is read as the handwriting progresses.
A straight line connecting those coordinate points is similarly written into the frame memory 5.

On the other hand, the display unit control unit 6 controls the frame memory 5 in predetermined synchronization.
The contents are sent to the liquid crystal display 2.

As a result, immediately after inputting the first stroke, a display as shown in FIG. Calculate the length l of the long side of the circumscribed rectangular frame, compare that value with a threshold value determined from the size of the character frame CF, determine whether there are two character shapes, and determine that one stroke is a character. . At this time, Fig. 3(b)
As shown in FIG. 3, the contents of the frame memory 5 are rewritten so as to move the center position of the character frame CF to the center position of the first stroke circumscribed rectangular frame.

When the second stroke (-) is input, since the starting point of the stroke is within the character frame CF, the first
It is determined that the stroke is of the same character as the stroke (see FIG. 3(c)).

At this time, flag information indicating that the first stroke and the second stroke are characters, information indicating that they are strokes of the same character "A11," and the number of coordinates constituting each of the first and second strokes. etc. are the stroke memory 404
The coordinates of each point are stored in the coordinate memory 403.

Figures 3(e) to (g) show the letter “B” to the right of the letter “A11”.
It shows how IT is written,
When the pen is moved down outside the character frame of the character "A" shown in FIG. 3(C), it is determined that the input of a character different from the character "A" has started. As shown in FIG. 3(e), the character frame CF for the character "A" is erased, and a character frame CF for inputting a new character is displayed centered on the same coordinate position when the pen is down. Then, as shown in Figure 3(f), the characters "
The first stroke (I) of “B” is input and the character frame C
This shows the display when the center position of F has moved and input of the next stroke (:3) has started.

Figure 3 (g) shows the display state when the input of the character "B 11" is completed, and the character "B" is displayed in the same way as the character "A".
The coordinates of each stroke (1) and (3) are stored in the coordinate memory 403, and flag information etc. are stored in the stroke memory 404.

FIGS. 3(h) to 3(k) show the state when inputting the interframe form (b). When the input of the first stroke (1) is started, a character frame CF is displayed as shown in FIG. 3(h). At the end of inputting the first stroke, since the long side of the stroke exceeds the threshold value, the stroke is determined to be a graphic stroke, and the display of the character frame CF is erased as shown in FIG. 3(i). Ru. At the start of inputting the next second stroke (C), a character frame CF is displayed as shown in FIG. 3(j), but at the end of stroke input, the stroke is determined to be a figure. Character frame C
The display of F is erased and FIG. 3(k) is displayed. At this time, coordinate data, flag information, etc. regarding the two strokes are stored in the coordinate memory 403 and stroke memory 404, respectively, as described above.

FIGS. 2A to 2C show the operation flow of the processing section 4, and the operation of the processing section 4 will be explained in detail below using the same figures.

When the process starts (step 5TO), first in step STI, a variable n that counts the number of strokes, a variable k that counts the number of coordinates for each stroke, and a variable m that counts the cumulative number of coordinates are initialized ( n=o, k=o
, m-0), and initialize the variable ic that counts the number of characters, the variable 151 that counts the number of strokes for one character, and the variable jz that counts the number of strokes of a figure (
s-0, jzxO).

Next, in step ST2, the state variable 5TATUS is initialized (5TATUS-0)L, in the following step ST3, data is read via the input interface circuit 401, and in the following steps ST4 and ST5, or step ST4 and step ST7, the pen is raised. /The following processing is performed depending on the combination of the pen down state and the 5TATUS variable. - When the pen is up and 5TATUS-0, the process returns to step ST3 to wait for input.

② When 5TATUS-1 is reached with pen up, perform the below-mentioned no pen down → pen up process.

② When 5TATUS-0 in pen down, perform the pen up → pen down process described below.

■When 5TATUS=1 in pen down, for example, using the graph drawing function defined in the processing system of the FORTRAN language, the coordinate point position of the previous input to the coordinate point position of the current input is transferred via the frame memory interface circuit 405. Then, a straight line is drawn on the frame memory 5.

Further, in step 5TIO, the gap (Xm1n, Ymin) of the rectangular frame circumscribed to the stroke is determined by the following formula.

Xm1n= M i n (X, Xmin)Xma
x= M a x (X, Xmax) Ymin=
M in (Y, Ymin) Ymax= M a
x (Y, Ymax) However, (X, Y) are the coordinates of this input, and Min (a, b) and Max (a,
b) are each variable a.

This is a process to find the minimum and maximum of b. step STI
After O, the process of step 5T108 is performed.

FIG. 2(B) is a diagram showing details of the above-mentioned pen up->down process. Once the process is started, step 5T10
0), First, step STI O1-C' Set the state variable 5TATUS to 1 to remember that the pen-up state has transitioned to the pen-down state.5TATUS-1)
, In the next step 5T102, depending on the value of the variable is for counting the number of strokes of one character, if 1s-0, the process goes to step 5T106, and if is≠0, the process goes to step ST103. In step 5T103, it is determined whether the input coordinates, that is, the starting point position of the stroke [(X, Y), are within the already set character frame. That is, the coordinates of the upper left and lower right of the character frame are respectively (X s r Y
S) + (Xe, Ye), Xs≦X≦Xe
・・・・・・・・・(1〉Ys5Y
≦Ye...Check the condition (2), and if both the above expressions (1) and (2> are satisfied, it is input and the stroke start point is within the character frame, and step 5T108 Proceed to the above formula (1> and <2>
If either one of the above conditions is not satisfied, the input start point is determined to be the start point of a new character or graphic stroke, and the process proceeds to step 5T104 to erase the displayed character frame. This process uses the same drawing function as described above to calculate the character frame coordinates (Xs, Ys),
(Xe.

This is done by filling the inside of a quadrilateral with the diagonal line ``Ye'' in the same color as the background color.

Next, in step 5T105, the variable 1ss for counting the number of strokes of one character is set to 0, and then in step STI 06 variables Xm1n, Xmax, Ymin, Y are used to calculate the circumscribed rectangular position of the stroke.
Initialize max using input coordinates (X, Y) (
Xm1n=X, XmaxxX, Ymin=
Y, Ymax-Y).

Next, in step 5T107, a character frame centered at the input coordinates, that is, the starting point (X, Y) of the stroke is drawn. This process L! X5=X-ΔX, YS=Y-Δ)' t X
With e = X + Δx, Ye - Y + Δy, use the same graph drawing function as above to draw two points (Xs, Ys) and (Xe,
This is done by drawing a rectangle whose diagonal is ``Ye'' using a specified line type (for example, a dotted line).

However, the above ΔX and Δy are parameters indicating the size of the character frame, which are set in advance by keyboard input or the like.

After the processing of step STI 07, step 5T108
to store the input coordinates in the coordinate memory 403 (MZ).
=m+1, (X, Y'')+MZ(m)) Increment the variable k that counts the coordinates (+1 to k=).

FIG. 2(C) describes in detail the processing when the input of one stroke is completed and changes from pen down to pen up.

When the process is started (step ST200), the variable n for counting the number of strokes is incremented (n-n+1) in step ST201, and in the following step ST202, it is determined whether the input stroke is a character or a figure. Then, calculate the long side of the circumscribed rectangle of the stroke as follows.

That is, ΔX −Xmax −Xm1n, ΔY−Yma
As x-Y@in, find the length 1 of the long side by ↓-M a x (ΔX, ΔY).

Next, in step 5T203, the length l of the long side is compared with the threshold value thl, and 5. If E<thl, the stroke is determined to be a character, and in step 5T209, the determination flag for character 1 figure is set to FLG-0, or if 1≧tht, it is determined to be a figure, and the determination flag is set in step 5T204. It is called FLG-1. Here, the threshold value thl is determined from the character frame parameters ΔX and Δy, for example, thl-0
, 7M a x (ΔX, Δy).

If the input stroke is determined to be a figure, step 5T2
Step 05 to count the number of strokes for one character js (js=js+1), stroke memory 4o4
Information on the flags FLG, js, is written to (Ms(n)) (step 5T206).

Thereafter, after erasing the character frame in the same manner as in step 5T104 (step ST207), step 5T
At step 20B, the variable k for counting the number of coordinates for each stroke is set to =o, and the process returns to step ST2 in FIG. 2(A).

If the input stroke is determined to be a character, in step ST210 after step ST209, the center position of the circumscribing rectangle of the stroke is determined (Xo-(X
max 10Xm1n)/2, Yo= (Ymax+
Ymin)/2), in step ST211,
Set the center of the character frame to the center position of the above circumscribed rectangle (Xo, Yo)
Perform processing to move to. That is, after deleting the displayed character frame using the method described above, the two diagonal lines of the new character frame
Point (Xs, Ys, i, (Xe, Ye), X5=X
o-Δx, Ys-Xo-Δy Xe=Xo+Δx, ysxxo+Δy, and a rectangle with the above two points as diagonals is drawn using the specified line type.

Thereafter, in step ST212, if the variable i, which counts the number of strokes of one character, is i,+mQ, the variable ic, which counts the number of characters, is incremented (icz ic+1) in step ST213, and then the stroke number is counted in step ST214. Count up the numbers 1s=is+l
), the stroke information FLG, is, ic, k determined as a character in step ST215 is stored in the stroke memory 404.
(MS(n)), the above step 5T20
8, the process returns to step ST2 in FIG. 2(A).

FIG. 4 is a diagram for explaining the contents of the coordinate memory 403 and stroke memory 404 in FIG.
shows the coordinate memory 403, and FIG.
is stored in the stroke memory 404, with a variable n for counting the number of strokes as an address, flag information FLG indicating the determination result of two characters and two figures for each stroke, a coordinate variable k constituting the stroke, and a flag FLG. Corresponding to the value, if FLG = O (character), the variable '1 c that counts the number of characters and the variable is that counts the number of strokes of one character, and if FLG-1 (I3C type), the figure A variable js representing the serial number of each stroke is stored.

In this embodiment, the size of the displayed character frame can be determined by inputting the above-mentioned parameters ΔX and Δy from the keyboard input section 7 as necessary, and can also be determined according to the position on the input screen. It is possible to automatically set the size of the character frame by formatting it in advance.

In addition, by storing format information that formats the size of the character frame in advance according to the position on the input screen, it is possible to automatically set the size of the character frame according to the position where the pen is down. This is useful for inputting documents with fixed formats related to size.

〔Effect of the invention〕

As explained above, according to the present invention, the following excellent effects can be obtained.

(1) Since the person writing the text can input characters or figures by hand while looking at the displayed character frame, if the person writes the letters too large or the figures too small, the text may be judged as a figure. It is possible to prevent errors in writing, such as when a figure is determined to be a character.

Therefore, as with the conventional example, it is possible to obtain the effect of separating characters and figures, and in addition to obtaining information separated for each character, it is also possible to write characters of a desired size in any position at a desired interval. This device provides a high degree of freedom in handwriting that cannot be achieved with conventional devices.

(2> Also, when inputting figures, the character frame display is erased to make it easier to see, improving man-machine performance and improving input efficiency.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the handwritten line diagram input device of the present invention, and FIGS. FIG. 3 is a diagram for explaining the operation of the processing circuit, and FIG. 4 is a diagram for explaining the contents of the coordinate memory and stroke memory. In the figure, 1: stylus pen, 2: liquid crystal display, 3: tablet, 4: processing unit,
5...Frame memory, 6...Display unit control unit,
7...keyboard input section, 4o1...input interface circuit, 402...processing circuit, 403...
...coordinate memory, 404...stroke memory,
4o5...Frame memory interface circuit.

Claims (2)

[Claims] (1) In a handwritten line figure input device that is equipped with an input/display integrated coordinate input device in which an input surface and a display surface are integrated, and which inputs line figures by hand using a pen, it is possible to input line figures by hand from pen down to pen up. means for counting each stroke as one stroke; means for displaying a character frame centered at that position when the pen is down; and a means for displaying a character frame centered at the position when the pen is down; When the length l is less than the threshold value, the stroke is determined to be a character stroke, and the center position of the character frame is moved to the center position of the stroke circumscribing rectangle and displayed. , when the length l is greater than or equal to the threshold, means for determining the stroke as a graphic stroke and erasing the character frame; when the starting point of the stroke when the pen is down is located within the displayed character frame; means for determining the starting point of the stroke as the starting point of a character stroke and continuing to display the character frame; when the starting point of the stroke when the pen is down is located outside the displayed character frame, the character frame to be displayed; A handwritten line figure input device comprising means for erasing the character frame and displaying a new character frame centered at the starting point of the stroke. (2) The handwritten line figure input device according to claim (1), wherein the size of the character frame is formatted in advance in accordance with the position on the display surface.