JPH0326844B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a handwritten character recognition device that reads the locus of a character stroke written on a tablet device with an input pen as a coordinate value and recognizes the character. This invention relates to a method for defining a character entry frame formed on a tablet.

[Prior Art] Generally, various handwritten character recognition devices of this type are disclosed in Nikkei Electronics No. 331 (December 5, 1983 issue) and the like. The tablet device used in this device has character writing frames formed in a matrix on the coordinate value reading surface, each of which is assigned a different predetermined coordinate value. In this way, the character entry frame formed on the coordinate detection surface of the tablet is designed so that when writing text, spaces are provided between the frames so that the coordinate values of the adjacent frame are not imported, in order to prevent the text from entering the adjacent frame. A method to do this is conceivable, but the assignment of the coordinate values of the above frame would be complicated.
Also, in order to simplify this assignment, it is possible to use a method that does not leave any space between the coordinate values, but if you frame the coordinate values in this way, it may cause an error if the input pen inadvertently enters an adjacent frame. May cause recognition.

[Object of the Invention] The present invention has been made to solve such conventional problems, and is a handwriting method that can effectively prevent entry into adjacent frames without complicating the distribution of coordinate values. The object of the present invention is to provide a tablet device as a character recognition device.

[Structure of the Invention] Therefore, the present invention provides a character recognition device that reads the trajectory of a character stroke written with an input pen on the coordinate detection surface of a tablet using coordinate values and recognizes the character. and make each section correspond to one coordinate frame.In addition to reading all the loci of character strokes to be written in each coordinate frame as coordinate values, create a margin on the right side and bottom of each coordinate frame for each coordinate frame. It is characterized by forming a text entry frame.

[Effects of the Invention] According to the present invention, the coordinate values of each frame of the tablet are allocated so that the areas are adjacent to each other without leaving any space between the frames, and the character entry frame of the format forming the entry frame is the coordinate allocation frame described above. Since the strokes are formed at the upper left of the frame, and margins are provided between adjacent frames on the right and bottom sides, strokes that extend outside the frame are read as if they were written in the same frame, thereby preventing erroneous recognition. can be prevented, and the allocation of coordinate values does not become complicated.

[Example] Hereinafter, an example of the present invention will be specifically described based on the attached drawings.

FIG. 1 shows the appearance of a handwritten character recognition device.

1 is a tablet device, and by bringing the input pen 2 close to the tablet surface, coordinate data of the position of the input pen 2 can be obtained at a density of, for example, 10 points/mm.
Xi and Yi are starting to be generated. This tablet device is generally known as, for example, an electromagnetic induction type input device.

The input pen 2 is connected to the tablet device 1 by a curl cord 3, and a writing instrument 4 is attached to the tip of the input pen 2. By pressing down or releasing the writing instrument 4 on the tablet surface, an ON/OFF stroke can be performed. It has a built-in switch.

Therefore, when characters or the like are written on the tablet surface with the input pen 2, the stroke locus thus written is output from the tablet device 1 as coordinate data together with the ON signal of the stroke switch. A recess corresponding to the thickness of the format sheet 10 is formed on the tablet surface, and the format sheet 10 is fitted into the recess. The format sheet surface and the tablet surface are substantially flat surfaces.
A white entry form 20 for notes is placed on top of the format sheet 10, and characters, etc. to be entered are written on the entry form surface.

Reference numeral 5 denotes a control unit for handwritten character recognition, which is connected to the tablet device 1 by a curl code 6, and is connected to an output device such as a CRT display device (not shown) that outputs characters recognized by the curl code 7. ).

On the format sheet 10, character entry frames 11, 11, . . . having predetermined coordinate values are arranged in a matrix.
11, . . . are horizontally arranged function key frames 14, 14, . . . which are used less frequently during character input, that is, during editing processing.

Also, the right side of the character entry frame 11, 11, ... (the left side is fine, but the right side is better from the viewpoint of operability)
, function key frames 13, 13, . . . that are frequently used during editing processing are arranged vertically.

An entry form 20 having a length corresponding to the width of the character entry frame group of the format sheet 10 is placed, and characters to be input are entered in the character entry frame using the writing instrument 4 of the input pen 2. For each filled frame, its locus is extracted as coordinate data, and character recognition processing is performed in the character recognition unit 5.

FIG. 2 shows the coordinate detection surface and character entry frame format on the tablet.

Now, the ordinate line X ₀ , Xnm and the abscissa line Y ₀ , Ynl
Tablet 10 is a rectangular area divided by
The coordinate detection surface 10A is defined by the ordinate lines X ₀ , Xn ₁ , Xn ₂ , ...Xnm and the abscissa lines Y ₀ , Yn ₁ , Yn ₂ , Ynl, Total n
It is divided into xl coordinate frames 12. This coordinate frame 1
The size of 2 is, for example, 15 x 15 mm ² .

On the other hand, for each coordinate frame 12, for example, 10×10
A character entry frame 11 with a size of mm ² is provided with margins 12a and 12b on the right side and bottom of each coordinate frame 12.In other words, the character entry frame 11 is placed at the upper left of the coordinate frame 12. Form in a piled state. This character entry frame 11 is formed on the format sheet 10 so that it can be clearly seen through the entry form 20.

As is clear from the above, on the coordinate detection surface 10A of the tablet, each coordinate frame 12 including the character entry frame 11 and the margins 12a and 12b on the right side and lower side of the character entry frame 11 has a corresponding coordinate value ( Xni, Yni), but on the format sheet 10 for character entry, the character entry frame 11
and margin portions 12a and 12b, and the person writing in the character entry frame 11 fills in the desired characters within this frame. When writing characters, even if the character goes beyond the character entry frame 11 and enters the margin portion 12a or 12b, the coordinate data will be processed as being within the same coordinate frame 12.

In the above format, the coordinate values of the tablet are generated as the position coordinates of the X-axis and Y-axis where the input pen 2 is located, with the upper left corner of the tablet coordinate reading surface as the base point. In the present invention, for convenience, the upper left corner of the character entry frame in the upper left corner is set as the base point X ₀ , Y ₀ . As a method to calculate the character entry frame filled with characters, if the input coordinate points are Xa and Yb, Xa
is divided by the length of each character entry frame in the column direction, and the integer part is determined as the column position.

Similarly, by dividing Yb by the length of each character entry frame in the row direction, the integer part is obtained as the row position.

Based on this frame position, it is also converted into coordinate data within the frame, and the data is extracted as stroke coordinate values, and then used as input data for recognition processing.

As is clear from the above, with the above configuration, even if a character is written slightly outside the character entry frame 11, it will be determined that it is within the same coordinate frame 10, so erroneous recognition such as character input completion etc. Since the coordinate frame 10 itself can be formed with areas in contact with each other, calculation of coordinate data can be performed extremely easily.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic perspective view of a handwritten character recognition device according to an embodiment of the present invention, and FIG. 2 is an explanatory plan view showing the relationship between the coordinate detection surface of the tablet and the character entry frame format. 1...Tablet device, 10A...Coordinate detection surface, 1
1...Character entry frame, 12...Coordinate frame, 12a, 12b
...margin area.

Claims (1)

[Claims] 1. In a character recognition device that reads the trajectory of a character stroke written with an input pen on a coordinate detection surface of a tablet using coordinate values and recognizes the character, the coordinate detection surface is divided vertically and horizontally, and each division is divided into two sections. Correspond to one coordinate frame, read all the loci of character strokes to be written in each coordinate frame as coordinate values, and create a character entry frame by leaving a margin on the right side and bottom of each coordinate frame for each coordinate frame. 1. A tablet device in a handwritten character recognition device, characterized in that a tablet device is formed with a handwritten character recognition device.