JPH03175523A - Handwriting information processor - Google Patents

Abstract

PURPOSE:To prevent the change of the data volume of a display dot string even in the case of the change of the height of characters to be handwritten by setting intervals of thinning to a value proportional to intervals of ruled lines in a handwriting processing device. CONSTITUTION:A coordinate reader 10 of an input dot string (a) on handwritten handwriting where ruled lines to prescribe the handwriting input range are arranged at intervals of a certain length dl, a ruled line interval storage means 50 where the length dl of line intervals is stored, a thinning interval calculating means 60 which sets a value proportional to the length dl of ruled line intervals as a length (d) of thinning intervals, a display dot string extracting means 20 which extracts at least the start dot on handwriting and adjacent dots, between which the distance exceeds the length (d), as a display dot string (b) from the input dot string (a), a display dot string storage means 30 where its coordinate values are stored, and a handwriting display means 40 which connects display dot strings by a straight line to display the handwriting are provided. Though the length dl of ruled line intervals is changed to change the size of characters, the data volume of the extracted display dot string is not changed because the length (d) of thinning intervals is changed in proportion to this change.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a handwriting information processing device that stores and displays an input point sequence read by a coordinate reading device as handwriting, that is, without any processing such as recognition. It is related to.

(Summary of the Invention) The sequence of manual points read by the coordinate reading device is input at a resolution determined by the hardware of the coordinate reading device, so storing all the sequences of manual points would be problematic due to the enormous storage capacity. It is.

The present invention provides handwriting information processing that reduces storage capacity by thinning the input point sequence read by a coordinate reading device to an extent that does not affect human recognition, and storing and displaying it as a display point sequence. The purpose is to provide equipment. To this end, in the present invention, ruled lines defining the range for inputting handwriting are arranged at regular intervals dl, and a coordinate reading device for reading the coordinate values of a series of human effort points on the handwritten handwriting is provided, and the ruled line intervals dfi are stored. a thinning interval calculation means for calculating a value proportional to the ruled line interval dll as a thinning interval; display point string extraction means for extracting points that cross the line as a display point string; display point string storage means for storing coordinate values of the display point string; and handwriting display means for displaying handwriting by connecting the display point strings with straight lines. A handwriting information device was constructed using the following.

[Conventional technology]

2. Description of the Related Art Devices that directly display handwriting read by a coordinate reading device have been known.

FIG. 2 is a block diagram of a conventional device. The configuration and operation of this device will be explained below.

When handwriting is performed on a coordinate reading surface using a pointing tool called a squirrel pen, the coordinate reading device 100 manually inputs the coordinate values of sampled points on the handwriting. The sampled points are defined by the spatial and temporal resolution of the coordinate reader. The average coordinate reading device has a spatial resolution of about 0.11 and a temporal resolution of about 2.
00 points/second. Sampling is performed at a resolution of 200 points/second regardless of the movement of the stylus, so even if the stylus is stationary, the coordinate values of the same point can be read continuously.

In the manual point sequence a' read by the coordinate reading device 100, the coordinate values of the same point may be continuous as described above. This poses a problem in terms of storage capacity. This type of device is intended to convey information to humans by displaying handwriting such as letters. therefore,
The amount of data can be reduced by removing similar points or actively thinning out data to the extent that it does not affect human cognition.

The display point sequence extracting means 200 thins out the input point sequence a′ for the above purpose. Since the 0 thinning interval storage means 500 stores the thinning interval d′, referring to this, The display point sequence b' is extracted while inputting the input point sequence a'.
and displayed as handwriting by the handwriting display means 400. Since the display point array b' is a collection of points, the handwriting display means 400 displays the handwriting by connecting the points with straight lines.

[Problem to be solved by the invention]

By the way, the selection of the thinning interval d' has been a difficult problem because it must satisfy both the requirement of reducing memory capacity and the requirement of not affecting human cognition. Through experiments, we have confirmed that it is best to set the thinning interval to a value proportional to the height of handwritten characters.

However, in the conventional apparatus, there is a problem that the thinning interval d' is a constant stored in the thinning interval storage means 500 and cannot be changed. Therefore, even if the same characters are written,
As the characters get larger, the amount of data increases, and conversely, as the characters get smaller, the spacing between strokes increases, making it difficult for humans to understand the L3 handwriting.

A direct object of the present invention is to realize a handwriting information processing device that defines the height of a handwritten character and extracts, stores, and displays a display point sequence from an input point sequence at a thinning interval proportional to the character height. It is to be. The purpose behind this invention is to reduce the storage capacity of handwriting information without affecting human cognition.

[Means to solve the problem]

A basic block diagram of the invention is shown in FIG.

In order to solve the above-mentioned problems, the present invention includes a coordinate reading device 10 in which formations defining the range of manual handwriting are arranged at regular intervals d6, and which reads the coordinate values of a series of manual points a on the handwritten handwriting; A ruled line interval storage means 50 for storing the ruled line interval dl; a thinning interval calculating means 60 for calculating a value proportional to the ruled line interval dl as a thinning interval d; display point sequence extraction means 20 for extracting points whose distance or length between two points exceeds the thinning interval d as a display point sequence;
and display point string storage means 3 for storing the coordinate values of the display point string.
0 and a handwriting display means 40 that displays handwriting by connecting display point arrays with straight lines. The optimum value for the ratio of the thinning interval d to the ruled line interval dl was determined through experiments.

[Effect]

In the handwriting information processing device configured as described above, the height of handwritten characters is defined by the ruled line interval, so the thinning interval has a value approximately proportional to the character height.

Therefore, even if the ruled line interval changes and the character size changes, the thinning interval also changes in proportion to the change, so the data amount of the extracted display point sequence does not change. In addition, the handwriting that displays the display point array also has a similar shape and does not affect human recognition, which is a distant relative of the problem of the present invention.

〔Example〕

(1) First Embodiment FIG. 3 is a diagram of the most preferred embodiment of the present invention. First, the configuration will be explained with reference to the drawings. The ruled line spacing storage means 50 has two outputs, the first output being connected to the display display means 41 and giving the displayed ruled line spacing dJ. The second output is the thinning interval calculation means 6
Connected to 0. A thinning interval calculation means 60 manually calculates the ruled line interval dl to obtain a thinning interval d.

In this embodiment, as the coordinate reading device 10 shown in FIG. 1, a display device-integrated coordinate reading device 11 in which a tablet 12 and an LCD (liquid crystal display) 42 are stacked and integrated is used.
is adopted. Since various devices of this type have been introduced, their explanation will be omitted.

The input point sequence a from the tablet 12 is input to the display point sequence extraction means 2.
The output of the 0 display point string extraction means 20 connected to 0 is connected to the display point string storage means 30. The extracted display point string is stored in the display point string storage means 30. The output of the zero display point string storage means 30 is connected to the display display means 41. Furthermore, the output of the display display means 41 is displayed on the LCD 42 as a handwriting by connecting the points with straight lines. It is now possible to do so.

Next, the operation will be explained.

FIG. 4 shows the LC of the display unit integrated coordinate reading device 11.
It is an explanatory diagram in which ruled lines are displayed on D42. The figure shows that a plurality of ruled lines k are displayed at intervals of dl.

The ruled line interval dl is a value recorded in the ruled line interval storage means 50, and is set arbitrarily as a function of the system.

The display display means 41 inputs the ruled line interval dl,
0 thinning interval calculation means 6 for displaying ruled lines as shown in FIG.
0, input the ruled line interval dl and calculate the thinning interval d by calculating Equation 1.

d = d I X con s t
---2 Here, conSt is a value indicating the ratio of the thinning interval to the ruled line interval. According to experiments, this value is
If the value is 2710 or more, the fidelity of handwriting decreases and affects human recognition, so it is known that it is better to set it to about 1/10.

On the other hand, the tablet 12 reads the coordinate values of the input point sequence a on the handwriting and outputs them to the display point sequence extraction means 20.

The information read from the tableno [2] is the coordinate value of each point,
This is information about the swift built into the stylus pen. The switch information is a signal that turns on when the tip of the stylus pen is pressed against the reading surface of the tablet and draws handwriting, and turns off when the tip is separated from the tablet. You can cut out images. The display point sequence extraction signal 20 extracts a display sequence from the input point sequence a while referring to the thinning interval d. There are several possible methods for this processing.

FIG. 5 is an explanatory diagram of the operation of the display point sequence extraction means 20. One method of thinning processing is as follows.

In the figure, P al+ P aZ+ P a3...
represents input point sequence a. The first operation of the display point string extraction means 20 is to adopt the starting point P1 as the starting point P1 of the display point string. The starting point of handwriting can be recognized by the stylus pen switch information as described above.

After extracting the starting point, the next point p a is taken as the starting point P0 as the extraction point.
Distance to i dl-. Find dl-, the thinning interval d
Compared to input point P1., where d, , > d. is adopted as the next extraction point Pb2.

In FIG. 5, d a (-d 1-4) > d, indicating that p□=pus was adopted. - For boat fishing, consider P □ as an already extracted point and compare the distance d, -1 to the next point P si with the thinning interval d, d, -,
The input point P a7 where >d is adopted as the next extraction point Pbk. This process is repeated until the end point. Whether or not to adopt the end point of the input point sequence a may be determined depending on the purpose. The thinning process may be performed as follows. Whereas the method described above uses the distance between the points to be adopted as the determination value, this method uses the length between the points to be adopted.

In other words, let pxi be the already extracted point and calculate the length lj-; to the next point pai (Note) d(t-1)-L is the point Pa(L- Indicates the distance from 1) to point P□.

and compare 12 j−i with the thinning interval d, e,
The human power point P□ where -1>d is adopted as the next extraction point Pbk. The start point and end point are handled in the same way as in the previous example.

The display point sequence extracted as described above is stored in the display point sequence storage means 30 and displayed as handwriting by the display display means 41. FIG. 6 is an explanatory diagram of the display by the display display means 41.

As shown in FIG. 6 (al), the display point array is discrete.

The display means 41 is as shown in FIG. 6 (bl).
These points are displayed on the LCD 42 by connecting each point with a straight line from the start point to the end point.

(2) Other Embodiments In the first embodiment, a coordinate reading device integrated with a display device is employed as the coordinate reading device. However, it can also be achieved with a regular tablet and display.

No. 7 UjJ is a block diagram of the second embodiment. As shown in the figure, a normal tablet 13 and display 43 are used as coordinate reading devices. In this configuration, the first
As shown in the embodiment, it is not possible to display ruled lines on the tablet. Therefore, for example, as shown in FIG. 8, a border 14 without ruled lines is pasted on the tablet.

The ruled line spacing dE is stored in the ruled line spacing storage means 50 as in the first embodiment. Although the method of displaying ruled lines is different in this way, the other configurations and operations are the same as in the first embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, when thinning out a series of human points in a handwriting processing device, the thinning interval can be set to a value proportional to the ruled line interval. Therefore, even if the height of handwritten characters changes, the amount of data in the extracted display point sequence does not change, making it possible to effectively compress data. Furthermore, when displaying a display point sequence, the shapes are similar, so that it does not affect human recognition.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a conventional block diagram, FIG. 3 is a block diagram of the first embodiment of the present invention, and FIG.
FIG. 5 is an explanatory diagram of the ruled line display in the first embodiment, FIG. 5 is an explanatory diagram of the operation of the display point sequence extraction means in the first embodiment,
FIG. 6 is an explanatory diagram of the operation of the display means in the first embodiment, FIG. 7 is a block diagram of the second embodiment of the present invention, and FIG. 8 is an explanatory diagram of ruled line display in the second embodiment. be. 10. 20. 30. 40. 50. 60. 11. 12. 42. Coordinate reading device Display point sequence extraction means Display point sequence storage means Handwriting display means Ruled line spacing storage means Inter-bow spacing calculation means Display device integrated coordinate reading device Tablet CD Display display means Input point sequence Display point sequence Thinning interval Ruled line interval

Claims (1)

[Scope of Claims] (a) A sequence of input points a on the handwritten handwriting in which ruled lines defining the range for inputting the handwritten handwriting are arranged at a constant interval between the ruled lines dl.
(b) means for storing the ruled line interval dl; (c) thinning interval calculation means for calculating a value proportional to the ruled line interval dl as the thinning interval d; (d) From the input point sequence a, at least the starting point of handwriting, a point from which the distance from an already extracted point to that point exceeds the thinning interval d, or between each point existing between an already extracted point and that point. display point string extraction means for extracting points whose sum of distances exceeds the thinning interval d as display points; (e) display point string storage means for storing coordinate values of the display point string; (f) display point strings; A handwriting information processing device comprising a handwriting display means for displaying handwriting by connecting rows b with straight lines.