JPH0640297B2 - Brush command method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for inputting a command by a stroke, and more particularly to a stroke command method for recognizing a command by a change in the direction of a stroke.

(2) Field of Technology In recent years, in communication networks, not only voice but also images using a tablet or the like have been transmitted. In the terminal of such a stroke communication system,
In addition to the image input / output area, there are keys for various commands, which were operated by pressing the keys. However, in a system having advanced functions, the number of keys is increased and a large terminal is required, which makes it difficult to operate. Therefore, a command method suitable for a stroke communication system has been desired.

(3) Conventional Technology and Problems The stroke command method is considered as a command method suitable for the stroke communication system. This is a method in which a symbol is drawn by hand on an input device such as a tablet, and the terminal recognizes it and inputs a command.

Although there is character recognition in what recognizes handwritten images, the symbols used for commands do not have to be complicated symbols such as letters and can be simple symbols. It is enough to recognize by calling.

FIG. 1 is a block diagram of a conventional symbol recognition method using a direction index. In FIG. 1, 1 is an angle calculation unit, 2 is a classification unit,
Reference numerals 3 indicate shift registers, respectively. FIG. 2 is an example of direction classification.

Conventionally, as shown in FIG. 1, the angle calculator 1 calculates the angle θ from the increment dx of the x coordinate and the increment dy of the y coordinate that have moved during a certain sampling period to detect the direction of the trailing line, and the classifier Two
To In and example corresponding direction indices in the vertical and horizontal four directions of ~ as boundary theta ₁ through? _4, as of FIG. 2 (direction
The command is identified by the direction index sequence stored in the shift register 3 after the direction index is stored in the shift register 3 sequentially after the symbols are classified into index;

However, according to this conventional method, the terminal user does not always look at the terminal from the front, and for example, the direction is not always drawn in the horizontal direction. There is a risk of making an error in determining the index.

(4) Object of the Invention An object of the present invention is to eliminate the above-mentioned drawbacks and provide a stroke command method by which a terminal user can obtain an accurate direction index without being aware of the direction of the stroke input unit.

(5) Structure of the invention A stroke command method for recognizing a command corresponding to the handwriting by inputting handwriting information, and means for sequentially storing coordinate values input in real time, stored in the storage means Means for detecting the direction of the drawing line from the coordinate values of the two drawn points, means for storing the direction of the drawing line at the beginning of writing, means for calculating the direction of the drawing line at each subsequent time point based on the direction of the drawing line at the beginning of writing, the calculated There is provided means for classifying the direction of the drawing line into a plurality of direction indexes, means for sequentially storing the direction indexes to obtain a direction index sequence from the start to the end of writing, and recognizing the command from the direction index sequence. Characteristic brush command method.

(6) Examples of the Invention Hereinafter, examples of the present invention will be described in detail.

FIG. 3 is a block diagram of an embodiment of the stroke command system of the present invention. In FIG. 3, 4,5,6,7 are registers, 8 and 9 are shown.
Is a subtractor, 10 is a divider, 11 is a tan ⁻¹ conversion table,
Reference numeral 12 is a numerical conversion unit, 13, 14, 15, 16 are comparators, 17 is a priority-ordered encoder, 18 is a differentiator, and 19 is a shift register.

In the embodiment of the present invention, the stroke is input by the input pen.
As two-dimensional coordinates of x and y, it is performed in real time at a fixed sampling period. The first registers 4 and 5 store the coordinate values x and y for each sampling period, and the second registers 6 and 7 store the coordinate values previously stored in the first registers 4 and 5 for each sampling period. To do. The differencers 8 and 9 respectively calculate the difference d between the new coordinate values x ₁ and y ₁ stored in the registers 4 and 5 and the previous coordinate values x ₂ and y ₂ stored in the registers 6 and 7.
Find x, dy. The divider 10 calculates dy / dx to obtain the slope k of the drawing line. The tan ^-1 conversion table 11 has slopes k and dx.
And angle dy on the image input area depending on the sign bit of dy
Find ₀ (0 ° <θ ₀ <360 °). The numerical conversion unit 12 stores the angle θ _R at the beginning of writing and converts the angle θ ₀ into an angle θ (0 ° <θ <360 °) with reference to the angle θ _R. Comparator 1
3,14,15,16 are θ ₁ , θ ₂ , θ ₃ , θ ₄ and the angle θ
And when θ is larger, the signal of “1” is
If is smaller, the signal of “0” is output to the priority-ordered encoder 17. The priority-ordered encoder 17 is a comparator
By input from 13,14,15,16, ₁ when θ ₄ <θ or θ <θ ₁ , 2 when θ ₁ <θ <θ ₂ , 3 when θ ₂ <θ <θ ₃ , and 3 θ ₃ < When θ <θ ₄ , the direction index (di) of 4 is output.
The differentiator 18 detects that the value of di has changed, and outputs a pulse to the shift register 19. The shift register 19 stores a new value of di each time a pulse comes from the differentiator 18. After drawing the symbol, the sequence of di (direction index sequence) is compared with the sequence registered in the control unit in advance to determine the symbol.

Next, the operation of the numerical conversion unit 12 will be described.

FIG. 4 is a block diagram of the third numerical conversion unit 12, in which 20 is a differentiator, 21 is a register, and 22 is RS.
Flip-flop (RSFF), 23 is a shift register, 2
Reference numerals 4 and 25 denote AND circuits, respectively.

FIG. 5 is a time chart in FIG. 4, in which st is a symbol input start signal and a is Q of RSFF22.
The output, sc is the sampling clock, p is the presence or absence of a pen input, b is the a output of the shift register, and c is the signal indicating the CK input of the register 21, respectively. The operation of FIG. 4 will be described below with reference to FIG.

The Q output a of the RSFF 22 is set by the symbol input start signal st from the control section, which indicates that a command can be input.
Further, when the signal p indicating the pen input is turned on, the Q output b of the shift register 23 is set in synchronization with the sampling clock sc. When a and b are set, the CK input c of the register 21 rises in synchronization with the rise of sc, and the value of θ ₀ is taken into the register 21, and at the same time, the Q of RSFF is changed.
The output a is reset. Since the signal c rises with a delay of one or more cycles of sc from the signal p, the direction of the drawing line is determined immediately after the start of input of the stroke symbol, and is stored in the register 21. Thereafter, the differencer 20 outputs it as the reference angle θ _R. The difference unit 20 is θ ₀
−θ _R is calculated to obtain the angle θ of the drawn line for each sampling period with reference to θ _R , and the result is output to the comparators 13, 14, 15, 16.

Next, the function of the terminal according to the embodiment of the present invention will be described.

FIG. 6 is a view of the terminal according to the embodiment of the present invention as seen from above, in which 26 is a pen, 27 is a terminal status display area, 28 is a fixed command input area, 29 is a stroke command input area, and 30 is an image. An input area, 31 indicates a handset of a telephone, respectively.

In the terminal shown in FIG. 6, the display unit and the input unit are integrated so that the figure or the like input by the pen 26 can be seen immediately. The bottom column includes a terminal (during calling, etc.) display area 27, a fixed command (end, etc.) input area 28, and a stroke command input area 29. The image input area 30 is an area for drawing an image to be sent to the other party. Since the pen input is performed in real time, the terminal can know the input start. In the terminal shown in FIG. 6, communication with the other party is performed through the handset 31 of the terminal at the same time as the writing communication.

FIG. 7 shows an example of a symbol of a stroke command.

The stroke command is, for example, a symbol as shown in Fig. 7 (of course,
Can be more). FIG. 7 (a) means storage of display image, (b) means reproduction of stored image, (c) means erase, and (d) means display of next page. Also, since the direction index is classified based on the direction of the drawn line at the beginning of writing, the same direction index sequence (-
Since −−), the symbols (e) and (f) are correctly recognized as the same.

(7) Effect of the Invention According to the present invention, it is possible to input a large number of commands in one input area, which makes it possible to reduce the size of a terminal. Operability is improved. It also has the effect of recognizing commands accurately.

Further, the present invention is not limited to the recognition of commands by simple symbols, but can be applied to the recognition of a wide range of figures including handwritten characters as long as the direction index is used.

[Brief description of drawings]

FIG. 1 is a block diagram of a conventional symbol recognition method using a direction index, FIG. 2 is an example of direction classification, FIG. 3 is a block diagram of an embodiment of a stroke command method of the present invention, and FIG. A block diagram, FIG. 5 is a time chart of each signal of FIG. 4, FIG. 6 is a view of the terminal according to the embodiment of the present invention as seen from above,
FIG. 7 shows an example of a symbol of a stroke command. In the drawing, 1 is an angle calculation unit, 2 is a classification unit, 3 is a shift register, 4,5,6,7 are registers, 8,9 are differentiators, 10 are dividers, 11 is a tan ⁻¹ conversion table, 12 Is a numerical value conversion unit, 13, 14, 15, 16 are comparators, 17 is a priority-ordered encoder, 18 is a differentiator, 19 is a shift register, 20 is a differentiator, 21 is a register, 22 is RSFF, and 23 is a shift register. 24 and 25 are AND circuits, 26 is a pen, 27 is a terminal status display area, 28 is a fixed command input area, 29 is a stroke command input area, 30 is an image input area, and 31 is a handset.

Front page continued (72) Inventor Shunji Abe 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (56) References JP-A-57-79584 (JP, A) JP-A-55-115178 (JP, A) JP-A-57-212585 (JP, A)

Claims (1)

[Claims] 1. A stroke command method for recognizing a command corresponding to a handwriting symbol as input, and means for sequentially storing coordinate values input in real time and stored in the storage means. Means for detecting the drawing direction from the coordinate values of the two points, means for storing the drawing direction at the beginning of writing,
A means for calculating a drawing direction at each subsequent time point based on the drawing direction at the beginning of writing, a means for classifying the calculated drawing direction into a plurality of direction indexes, and sequentially writing the starting indexes by sequentially storing the direction indexes. A stroke command system having means for obtaining a direction index sequence to the end and recognizing the command from the direction index sequence.