JPH0415488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a tablet coordinate conversion method, and more particularly to a tablet coordinate conversion device suitable for use in an online character recognition device.

(Background Art) A block diagram of a data input section of a conventional online character recognition device is shown in FIG. In Figure 1, 1
is a tablet, 2 is an analog/digital converter (hereinafter referred to as A/D), and 3 is an input register (hereinafter referred to as IR). There are various types of tablets 1, such as electromagnetic coupling type, electrostatic induction type, and resistive film type, but all of them are based on
The absolute coordinates of the directions are sequentially sent out under the control of a control section not shown. Assuming that Tablet 1 is a resistive film type tablet, and the coordinates in the x and y directions are sent out as voltage values, the voltage sent out from Tablet 1 is sent to A/D 2, where it is converted into digital data. After that, it is stored in IR3. IR
3 is configured to sequentially store data generated in time series in the x and y directions at predetermined locations in each of the x and y directions. Data input from the tablet 1 is converted into digital values, stored in the IR3 and read out from the IR3 in a time-sharing manner, and the data read out from the IR3 is used as data for online character recognition processing.

Tablet 1 in Figure 1 is defined as the coordinates with the origin at the bottom left of tablet 1, so
When you press down on the lower left edge of tablet 1 with a writing instrument, x
The value of = 0, y = 0 is stored in IR3, and then when the upper right corner is pressed with a writing instrument, the maximum value of x = x (hereinafter
M _x ), y = maximum value of y (hereinafter referred to as M _y )
is stored in IR3.

Tablet 1 in Figure 1 is set to be placed horizontally, so if you write the letter "A" here as shown in Figure 2 a, the recognition unit will correctly write it as "A".
However, if the tablet 1 is set up vertically with the left side at the bottom as shown in Figure 2b, and "A" is written, then when the tablet 1 is set horizontally, it will be written as "A".
This means that the recognition unit cannot recognize this as the letter "A".

As described above, in the conventional method, when tablet 1 is used for online character recognition, if it is installed in a position different from the preset position, even if normal characters are written, they will not be recognized as the characters intended by the scribe. There was a big drawback. For example, if Tablet 1 is A4 size, then A4
This also had the drawback of not being able to meet the demand for paper that could be used both horizontally and vertically.

SUMMARY OF THE INVENTION In order to eliminate these drawbacks, it is an object of the present invention to provide a coordinate conversion device that allows a tablet used for online character recognition to be used both horizontally and vertically.

(Effects and Operations of the Invention) An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. Fig. 2 is a diagram showing how to use the tablet device, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a diagram showing the control procedure of the block diagram of the present invention. . In Figure 3, 1 is a tablet, 2 is an A/D, 3 is an IR, and 4 is a tablet.
is the x coordinate data register (hereinafter referred to as IXR), 5
is the y-coordinate data register (hereinafter referred to as IYR), 6
is a switching gate with truth/false switching (hereinafter referred to as T/CEXG), 7 is a switching gate (hereinafter referred to as EXG), and 8 is a full adder (hereinafter referred to as ADD).

Here, the usage of the tablet 1 and the coordinate conversion method will be explained with reference to FIG. The tablet 1 whose origin is TA in FIG. 2 is set to be installed horizontally as shown in FIG. 2a. In such a case, it is common to install nothing other than the tablet frame at the left and right ends and lower part of the tablet 1, and to install the display section/switch section 9 at the top. This is to prevent the scribe's hand from getting in the way when writing on the tablet 1.

When using this tablet 1 with a vertically long sheet of paper set, it is impossible to set the sheet in a horizontally long state, so the TB is used as the origin as shown in FIG. 2b. This is because when the display section/switch section 9 is placed on the left side, it does not get in the way of the user's hands.
However, if a left-handed person uses the tablet 1 in portrait orientation, if the TB is used as the origin, the display/switch section 9 will get in the way, so it is necessary to use the TC as the origin as shown in Figure 2c.

Therefore, when using tablet 1 with a vertically long sheet of paper, it is sufficient to perform coordinate transformation with TB or TC as the origin, and when TB is the origin, it is clear from Figure 2b. As shown, the new coordinates X and Y are determined by the hardware of Tablet 1, and are IXR4 and IYR5.
Let x _and y be the absolute coordinates input to the tablet, and M _y be the maximum coordinate value in the yk direction on the tablet.

Similarly, when TC is the origin as shown in FIG. 2c, and M _x is the maximum coordinate value in the x direction on the tablet, it is expressed as X=y and Y=M _x -x.

In addition to the case where TA is the origin,
The block diagram shown in FIG. 3 shows the configuration of the coordinate conversion device to perform the conversion using TB and TC as the origin. Below, in FIG. do. In addition, since FIG. 4 shows the control procedure for each origin, the explanation will be made while referring to it at the same time.

When characters are written on the tablet 1, the analog data is sent to the A/D 2 and converted into digital data, and the x-coordinate data is stored in IXR4 and the y-coordinate data is stored in IYR5. When TB is the origin, the new X is M _y - y, so the y data stored in IYR5 is selected by T/CEXG6, and the one's complement is taken and output to output O of T/CEXG6. (corresponds to → in Figure 4). Note that T/CEXG6 is controlled by control line S1 so that the data of IXR4 or IYR5 is selected and input, and the true value or 1's complement value of the input is output as the output (S1 requires two signals. However, in Figure 3, it is virtually written as one line). At the same time, EXG7 is configured so that M _x or M _y is selected by the control line S2 and output to the output E of EXG7, but in this case, M _y is selected and EXG
7 output E (M _y → in Fig. 4)
(equivalent to E). The output of T/CEXG6 is ADD8
is input to the A input of EXG7, and the output E of EXG7 is input to ADD8.
Since the level 1 ADD1 signal is input to the C input (carry input) of ADD8, the one's complement of IYR input to the A input becomes the two's complement, and this and ADD8 My input to the B input of is added, and as a result, the calculation result of My _{- y is} output to the output S of ADD8. This output S is connected to the output of T/CEXG6 by a tri-state circuit, and the control section (not shown) selects the output S of ADD8 at this point, so the value of M _y -y is sent to IR3 as the value of the X coordinate. is input. Next, IXR4 is selected by T/CEXG6, and its true value is further output to T/CEXG6, and at this point the tristate circuit is in T/CEXG6.
Since the output of CEXG6 is selected, the x value is input to IR3 as the Y coordinate value.

Figure 4 shows the data flow explained above, where S1 represents the operation of T/CEXG6, and S2 represents the operation of T/CEXG6.
It shows the operation of EXG7, IR is a diagram of what is input to IR, TA, TB, and TC indicate the position where the origin is set, and the upper part of the dotted line that bisects the solid line frame is The new X coordinate calculation is shown, and the lower part of the dotted line shows the new Y coordinate calculation. Also T/CEXG
ADD when or is output to the output of 6
It is assumed that an ADD1 signal of level 1 is output for the signal 8.

Similarly, when TC is the origin,
As shown in Figure 4, the new coordinate X is y data, so
IYR→,→IR becomes IYR (y data) is IR3
is stored as an X coordinate value. Also, the new coordinate Y is Y
= M _x −x, so (the number of 1s of x) is output to , M _x is output to E, and the level 1
Since the ADD1 input is input to ADD8, the output S=M _x −IXR (x data) of ADD8 is stored in IR3. When TA is the origin, IXR and IYR are output as they are to the output of T/CEXG6 and stored in IR3.

In the coordinate conversion device of this embodiment, TA, TB,
Which TC is used as the origin is determined by providing an external switch and setting the mode by pressing the switch.

As explained above, in the above embodiment, the tablet 1 is used from three directions in order to convert the coordinate data (x, y) input from the tablet 1 into new coordinate data (X, Y) and input it to the IR 3. be able to. In the tablet of the conventional online character recognition device, only preset paper can be used, but with the present invention, it is possible to use both horizontal and vertical paper with a simple switch operation. Furthermore, according to the method of the present invention, even when the tablet is used in a different direction, the online character recognition unit does not need to be aware of any change in orientation, and therefore the character recognition unit can change the direction in which the tablet is used without affecting the recognition unit. We can provide an innovative method that allows you to change the It should be noted that those skilled in the art can easily infer that the present invention is a method that can be easily realized in terms of software using a microcomputer without relying on the block diagram shown in FIG.

(Effects of the Invention) As explained above, the coordinate conversion device of the present invention has the advantage that the tablet of the online character recognition device can be used both vertically and horizontally.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a data input section from a tablet of a conventional online character recognition device, and Figs. 2 a to c are diagrams showing how to use the tablet.
Figure a shows the tablet in landscape orientation, Figure 2 b shows the tablet in portrait orientation with the display and switch parts to the left, and Figure 2 c shows the tablet in portrait orientation with the display and switch parts to the right. This is a diagram used for FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. 4 is a diagram showing a control procedure of the block diagram of the present invention. 1...Tablet, 2...Analog-digital converter, 3...Input register, 4...X coordinate data register, 5...Y coordinate data register, 6...Switching gate with true/false switching, 7...Switching gate , 8...Full adder, 9...Display section・
Switch part.

Claims (1)

[Scope of Claims] 1. An A/D converter 2 that converts the analog output of the tablet into digital data; and x-coordinate data that stores x-coordinate data x and coordinate data y of the output of the A/D converter 2, respectively. a register 4 and a y-coordinate data register 5; connected to the outputs of the data registers 4 and 5;
A first switching gate 6 which selects one of these x and y and outputs it as it is or its complement, and the maximum coordinate value (M _x ,
a _second switching gate 7 that selects one of the origin points TA, TB, and TC on the tablet according to the vertical or horizontal length of the document; and switching gates 6 and 7. adder 8 that adds the outputs of
and a register 3 for storing the output of the adder 8 and the output of the switching gate 6 as coordinate-transformed data, and the first switching gates 6 and 7 are set to (a) by the setting of the switch. If 1 mode TA is set, the first
The switching gate 6 first selects and outputs the output x of the x-coordinate data register 4, then the output y of the y-coordinate data register 5, and the second switching gate does not output anything. (b) When the second mode TB is set, the first switching gate 6 first stores the coordinates X and Y of the y coordinate data register 5 as X=x, Y=y. The complement of the output -y, the second switching register 7 outputs the maximum coordinate value M _y in the y direction, and then,
The first switching gate 6 is the x-coordinate data register 4
₍ c) When the third mode TC is set, First, the first switching gate 6 selects the output y of the y-coordinate data register 5, and the second switching gate 7 selects the output y of the y-coordinate data register 5.
does not output anything, then the first switching gate 6 outputs the complement of the output of the x-coordinate data register 4 - x, and the second switching gate 7 outputs the maximum coordinate value in the x direction.
A coordinate conversion device characterized in that by selecting M _x , X=y Y=M _x −x is stored in a register 3.