JPH08249104A - Method and device for processing coordinate data - Google Patents

Abstract

PURPOSE: To provide a coordinate data processing method and device capable of outputting coordinate data with high resolution without reducing the processing speed of a connected computer equipment. CONSTITUTION: Detailed coordinate data indicating a specified coordinate position are generated from a digitizer controller 42 at a prescribed time interval and successively stored in a coordinate memory 45. The coordinate data stored in the memory 45 are thinned out at a prescribed interval and the thinned data are read out and outputted to the computer equipment 47 as rough coordinate data. At the time of receiving a transmission request for detailed coordinate data including the positional information of the coordinate data, the detailed coordinate data stored in the memory 45 are read out in accordance with the received transmission request and outputted to the equipment 47.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate data processing method and apparatus for outputting coordinate data indicating a designated coordinate position to a connected computer device.

[0002]

2. Description of the Related Art There is a system in which a coordinate input device such as a digitizer is connected to a computer device. In such a system, when the coordinate input is performed on the coordinate input surface of the digitizer, the designated coordinate position is detected and output to the computer device at regular time intervals. On the other hand, in computer equipment, an interrupt is generated each time coordinate data is input from the digitizer, and the interrupt processing routine inputs coordinate data from the digitizer.

Therefore, in a handwritten character recognition device using such a digitizer, in order to improve the character recognition rate, the accuracy of coordinates detected by the digitizer is increased and the output interval of the coordinate data is made fine ( It is conceivable to reduce the sampling interval of coordinate data).
However, this increases the number of interrupts generated in the computer equipment, and the CPU of the computer equipment
However, there is a problem in that the other processing is hindered, and as a result, the processing speed of the entire character recognition device decreases.

Therefore, for example, Japanese Patent Laid-Open No. 01-209523
As disclosed in No. 3, there is one that changes the output time interval of the coordinate data output from the digitizer according to the moving speed of a coordinate indicator on the coordinate input surface, for example, a pen. However, in this way, when the pen movement speed is slow, the time interval becomes long, and conversely, when the pen movement speed is fast, the time interval becomes short, and the number of interrupts always increases, which does not hinder processing. The minimum value of the output time interval of the coordinate data is limited to a range that does not hinder other processing.

[0005]

In such a conventional digitizer, if the output time interval of the coordinate data is shortened,
There is a problem that the processing speed of the computer device that inputs the coordinate data from the digitizer decreases,
Since the digitizer disclosed in the above-mentioned Japanese Patent Laid-Open No. 01-209523 cannot output coordinate data with a certain degree of accuracy or more, even if a computer device tries to improve the coordinate position accuracy of a certain part, it can be dealt with. could not. Therefore, it has been desired to develop a coordinate input device such as a digitizer that can output a large amount of coordinate data to a computer device as needed without hindering the processing of the computer device to which the digitizer is connected. .

The present invention has been made in view of the above conventional example, and provides a coordinate data processing method and apparatus capable of outputting coordinate data with high resolution without reducing the processing speed of a connected computer device. The purpose is to

It is another object of the present invention to provide a coordinate data processing method and apparatus capable of outputting coordinate data having a higher sampling density to a computer device in response to a transmission request of the coordinate data from the connected computer device. To provide.

Another object of the present invention is to provide, when the coordinate position is instructed by a coordinate pointing tool such as a pen, in accordance with an instruction from a computer device, depending on the position where the coordinate pointing by the coordinate pointing tool is stopped. It is an object of the present invention to provide a coordinate data processing method and an apparatus therefor capable of outputting close coordinate data.

[0009]

In order to achieve the above object, the coordinate data processing device of the present invention has the following configuration. That is, the coordinate data indicating the designated coordinate position is
A coordinate data processing device for outputting to a connected computer device, the coordinate data generating means generating coordinate data indicating a designated coordinate position at predetermined time intervals, and the coordinate data generated by the coordinate data generating means. A reading means for thinning out the coordinate data stored in the storing means at predetermined intervals and reading the coordinate data for output to the computer device; and a receiving unit for receiving a coordinate data transmission request from the computer device. And means for reading coordinate data stored in the storage unit and outputting the coordinate data to the computer device in response to a transmission request received by the receiving unit.

In order to achieve the above object, the coordinate data processing method of the present invention comprises the following steps. That is, a coordinate data processing method for outputting coordinate data indicating a designated coordinate position to a connected computer device, the step of generating coordinate data indicating the designated coordinate position at predetermined time intervals, and A step of sequentially storing the generated coordinate data in a memory; a step of thinning out and reading out the coordinate data stored in the memory at predetermined intervals and outputting to the computer device; a request for transmission of coordinate data from the computer device; And a step of reading coordinate data stored in the memory and outputting the coordinate data to the computer device in response to the transmission request.

[0011]

In the above structure, the coordinate data indicating the designated coordinate position is generated at a predetermined time interval, and the generated coordinate data is sequentially stored in the storage means. Coordinate data stored in the storage means is thinned out at predetermined intervals and read out and output to the computer device, and when a transmission request for coordinate data is received from the computer device, in response to the received transmission request, It operates so as to read the coordinate data stored in the storage means and output it to the computer device.

Further, preferably, in the coordinate data processing device of the present invention, the coordinate position is designated by pointing the coordinate input surface with the coordinate pointing device, and the transmission request from the computer device is transmitted by the computer device by the coordinate pointing device. This is information for requesting transmission of coordinate data immediately before the instruction operation is stopped (for example, a pen-up operation).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIGS. 2A to 2D are diagrams for explaining the sampling intervals of coordinate values when the intervals of sampling timing of coordinates are rough, as a premise of the present embodiment.

Reference numerals 21 and 23 in FIGS. 2A and 2B denote point groups in which output coordinate data groups having coarse sampling timing intervals are plotted, and 22 and 24 in FIGS. 2C and 2D.
Indicates a straight line group connecting points corresponding to these coordinate points. The point groups 21 and 23 indicate point groups on one locus (the same loci in FIGS. 2A and 2B) designated by using the coordinate input pen. Only the sampling time intervals (timings) of the points are different.

As described above, if the sampling time intervals are rough, even if the same locus is drawn by the input pen, the sampling results will be greatly different as shown in FIGS. 2 (A) and 2 (B). The straight line connecting these points is completely different as shown in FIGS. 2 (C) and 2 (D). Actually, the third point 23 of the point group 23 of FIG.
The straight line group 24 of FIG. 2 (D) in which 0 is sampled is more likely (more close to the actually drawn trajectory) than the straight line group 22 of FIG. 2 (C). There is.

FIG. 1 is a diagram for explaining a detailed method of outputting coordinate data in the coordinate input device according to the first embodiment of the present invention.

In FIG. 1, 11 in FIG. 1A shows a point group in which a coordinate data group having a rough sampling timing is plotted, and 12 in FIG. 1B connects the points indicated by these coordinate data. A straight line group is shown. 1 in FIG. 1 (C)
3 is a point 11 corresponding to the second and third coordinate data
A straight line connecting 0 and 111 is shown. 14 is a straight line connecting the points 111 and 112 corresponding to the third and fourth coordinate data, and 15 is a straight line connecting the points 112 and 113 corresponding to the fourth and fifth coordinate data. Shows. Further, 16 in FIG. 1C shows a straight line 13 extending in the traveling direction, and 17 shows a straight line 14 extending in the traveling direction. Then, 18 in FIG. 1D represents points 111 and 112.
The points corresponding to the detailed coordinate data between and are shown.

In FIG. 1C, a straight line 16 and a straight line 14
If the angle formed by is θ1 and the angle formed by the straight line 17 and the straight line 15 is θ2, the accuracy of the straight line 14 between them can be understood. In other words, when both the angles θ1 and θ2 are large angles, the straight line 14 connecting them is less likely to be a straight line that faithfully follows the original trajectory. Therefore, between the third point 111 and the fourth point 112, as shown in FIG.
It is necessary to obtain the point group 18 based on the detailed coordinate data as shown in FIG.

In the case of the first embodiment of the present invention, the sampling frequency of these detailed coordinate data is set to about four times the sampling frequency for roughly sampling the coordinate data, but the present invention is not limited to this. It may be any multiple, for example, 1.2 times or 100 times.

FIG. 3 is a diagram for explaining a point group plotted based on the coordinate data when the sampling timing of the coordinate data is rough in the coordinate input device according to the second embodiment of the present invention.

In the figure, 31 indicates a point group plotted corresponding to coordinate data having a rough sampling timing, and 32 indicates a straight line group connecting these points in sequence. Further, 33 is a point corresponding to the coordinate data output last among these points 31, and 34 is a point plotted based on the detailed coordinate data.

In this case, the pen is moved up after the final coordinate data is output and the corresponding point 33 is determined. Generally, in a character recognition device or the like, this pen-up point is very important information. Further, the point 33 based on this final coordinate data may be a point that has been pen-uped, and may be a point that is largely separated from the position of the next input point.

Therefore, in the second embodiment, coordinate data closer to the pen-up point is output, and the point 34 based on the detailed coordinate data is output. Actually, it is uncertain how many detailed coordinate data will be provided. The maximum value of this number is the sampling frequency of the detailed coordinate data,
It corresponds to the number divided by the sampling frequency of the coarse coordinates. Further, the minimum value of this number is "0", and in this case, it means that the pen-up is performed before any detailed coordinate data is output after the point 34.

FIG. 4 is a block diagram showing a schematic configuration of a coordinate input device (digitizer) common to the first and second embodiments of the present invention.

In the figure, reference numeral 41 shows the entire structure of the digitizer of this embodiment, and 42 is a digitizer controller for controlling each part of the digitizer 41. 43 is a digitizer
The coordinate data output from the controller 42 is shown here, for example, the coordinate data of 200 points per second. Reference numeral 44 denotes a processing unit peculiar to this embodiment, and the processing in this processing unit 44 will be described later in detail. A coordinate memory 45 temporarily stores coordinate data (detailed coordinate data) output from the digitizer controller 42. A data creating unit 46 creates coordinate data to be output to the computer device 47 to which the digitizer 41 of this embodiment is connected.
Reference numeral 47 is a computer device that connects the digitizer 41 of this embodiment and inputs and processes the coordinate data from the digitizer 41. The computer device 47 receives the coordinate data output from the digitizer 41 and, for example, recognizes handwritten characters or draws image data. It is carried out. A bidirectional communication line 48 connects the computer device 41 and the digitizer 41 of this embodiment. In this example, the coordinate data (coarse coordinate data) output from the digitizer 41 is the detailed coordinate data 1 /
Coordinate data of 50 points per second thinned out to 4 is used.

FIG. 5 shows the processing unit 44 of the first embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG. The coordinate memory 45
Is composed of a dual port memory, and in FIG. 5, the portion other than the coordinate memory 45 corresponds to the data creating unit 46 in FIG.

Reference numeral 501 is a communication controller for communicating with the digitizer controller 42, and 502 is a data buffer. In the coordinate memory 45, 503 is a memory area for storing X coordinate data, 504 is a memory area for storing Y coordinate data, and 505 is a pen-up flag for storing pen up / down information.

A communication controller 506 communicates with the computer equipment 47. 507 is an address counter on the receiving side of the coordinate data from the digitizer controller 42, 508 is an address counter on the sending side to the computer device 47, 509 is a buffer, 51
Reference numeral 0 indicates an area for holding the lower 2 bits of the sending side address counter 508, and reference numeral 531 indicates a subtractor.

FIG. 6 is a diagram showing a point group plotted based on the coordinate data (detailed coordinate data) sent from the digitizer controller 42 of the first embodiment of the present invention.

The operation of the digitizer 41 having the configuration shown in FIG. 5 will be described in detail below with reference to FIG.

Before the detailed coordinate data group corresponding to the points shown in FIG. 6 is input, the value of the address counter 507 is, for example, "01FH" (H is a hexadecimal number), and the value of the address counter 508 is, for example, "01CH. ” Further, it is assumed that “2” is set in the buffer 509.

Now, through the signal line 511, coordinate data from the digitizer controller 42 (point 601 in FIG. 6).
(Corresponding to) is input to the communication controller 501, the coordinate data thereof is input to and stored in the coordinate memory 45 through the data buffer 502. The address of the coordinate memory 45 at that time is “01FH” output from the address counter 507. Here, as the write signal to the coordinate memory 45, the data present signal 516 from the communication controller 501 is used. At the same time, the data present signal 516 increments (+1) the content of the address counter 507. As a result, the value of the address counter 507 becomes "020H (= 01FH + 1)". Further, this data present signal 516 is transmitted to the buffer 509.
Has also been entered. As a result, the value of the buffer 509 becomes "3" (= 2 + 1). This buffer 509 has 2
It is a bit counter, and outputs the increment signal 518 to the address counter 508 only once when the count value of the buffer 509 becomes “4”.

Next coordinate data (corresponding to point 602 in FIG. 6)
Is input, the coordinate data is stored in the coordinate memory 45 in the same manner as the previous coordinate data (corresponding to the point 601 in FIG. 6).
As a result, the count value of the buffer 509 is “3 + 1 = 4”.
(Carry up and return to "0"). As a result, the increment signal 518 is output from the buffer 509,
The third bit from the bottom of the address counter 508 is incremented by 1, and the count value becomes “020H (= 01CH + 04)”.

At this time, the address counter 508 outputs the data write signal 521 to the communication controller 506,
The address “02” output from the address counter 508
The data (X coordinate, Y coordinate, pen-up flag) corresponding to “0H” is read from the coordinate memory 45 and output to the communication controller 506. Accordingly, the communication controller 506 and the computer device 47 are connected to each other. Point 60 of FIG. 6 read through the communication line 515
The coordinate data (X coordinate, Y coordinate, pen-up flag) corresponding to 2 is output.

By continuing the above operation, the plotted point groups 602, 606, 6 indicated by large squares in FIG.
The coordinate data (coarse coordinate data) corresponding to 10,614,618 can be sent to the computer device 47. At this time, the value of the address counter 507 is "033.
H, and the value of the address counter 508 is "030".
H ".

Next, point 610 from the computer equipment 47.
The operation when a transfer request for detailed coordinate data between the point and the point 614 is input will be described. In this case, from the computer device 47 via the communication line 515, the last point 618-3.
The point 6 following the coordinate data of the previous point (the position of the point 618 is "0") (the coordinate data corresponding to the point 610 of FIG. 6).
The value “2” (data indicating the previous two), which means that the coordinate data is 11, is sent. The communication controller 506 that has received it outputs the value “2” as the signal 519.

The subtractor 531 is a circuit (adds complement) for subtracting the value designated by the signal 519 from the upper bits (excluding the lower 2 bits) of the contents of the address counter 508. Address counter 5
The value of the signal 519 (substantially "8" because it is 2 but subtracted from the 3rd bit) is subtracted from the upper bit of 08. As a result, the output of the subtractor 531 changes from "030H" to "028H = (030H-8 = 28H)". At the same time, in response to the data of signal 519,
The bit counter 510 is counted up.

In this way, the address counter 508
The output address values are "029H" and "02A".
H "," 02BH "," 02CH ", etc. At this time, the address signal obtained by ORing the lower 2 bits of the address output from the subtractor 531 and the output of the lower 2 bit counter 510. Then, the X and Y coordinate data and the pen-up flag are read from the coordinate memory 45 and output to the communication controller 506. The lower 2-bit counter 510 is kept independent so that the carry does not affect the upper bits. The carry signal 522 clears the signal 519 from the communication controller 506. In this way, the counting operation of the lower 2-bit counter 510 is stopped, and the subtraction value of the subtractor 531 becomes "0" (the value as it is). By this operation, the point cloud 61 shown in FIG.
The detailed coordinate data corresponding to 1,612 and 613 is output to the communication controller 506, and is output to the computer device 47 via the communication line 515.

FIG. 7 shows the digitizer 41 of the first embodiment.
5 is a flowchart showing a process executed in response to a coordinate data transmission request from the computer device 47, and this flowchart is a data creation unit 46 shown in FIG.
3 shows the flow of processing in.

In step S1, the communication controller 506
Upon receiving a request for transmission of detailed coordinate data from the computer device 47 and a numerical value (a: “2” in the above description) indicating the position of the data, the communication controller 506
The numerical value (a) specified by the computer device 47 is output to the signal 519 (step S2). Then step S3
Then, the subtracter 531 subtracts the value (a × 4) obtained by shifting the numerical value (a) by 2 bits from the output value of the address counter 508. Let this value be A.

Next, in step S4, the value of the index counter i is set to "1", and in step S5, the address (A + i) obtained by adding the value of i to the address value (A) obtained in step S3 is stored in the coordinate memory. Output to 45. Then, in step S6, the X and Y coordinate values and the pen-up flag are read from the address, and are read out by the communication controller 5
It outputs to the computer equipment 47 via 06. In step S7, the counter i is incremented by 1, and in step S8 it is checked whether or not the value of the counter i is equal to or more than "3". If not, the process returns to step S5 and the above-mentioned processing is repeated. When the value of the counter i becomes "3" or more in step S8, the process proceeds to step S9, the carry signal 522 is output to reset the signal 519, and the subtracter 53
Reset the subtracted value of 1 to 0. At this time, the 2-bit counter 510 is reset to "0".

In the first embodiment described above, the case where the data creating section 46 is composed of a discrete circuit has been described, but the present invention is not limited to this. For example, a microprocessor and its control program. Even if it is realized by the above, the same processing can be performed and the same effect can be obtained.

Further, in the above-mentioned first embodiment, the detailed coordinate data sampled by the digitizer controller 42 is output to the computer device 47 every four, but the present invention is not limited to this. No, it may be other than that. In that case, the counter 510
Is not a 2-bit counter, but a 3-bit counter, a 4-bit counter, or the like depending on the number of thinned-out counters.

<Second Embodiment> Next, FIG. 8 is a block diagram showing a configuration of a data creating section 46 of a coordinate input device (digitizer) according to a second embodiment of the present invention, which is common to FIG. 5 described above. The parts to be shown are indicated by the same numbers, and their explanations are omitted.

In FIG. 8, reference numeral 71 is a subtracter for subtracting -1 from input data, 72 is a selector, and 73 is a comparator. In this state, the selector 72 operates as shown in FIG.
5 corresponds to the address counter 508 in FIG.
Since the operation is the same as that of 1., the description thereof will be omitted.

The computer equipment 47 has a point 618 in FIG.
A case will be described in which, after receiving the pen-up flag corresponding to, the transmission request for the detailed coordinate data of the position closest to the pen-up is output to the communication controller 506. In this case, for example, it is assumed that the data “0” is transmitted from the computer device 47. Data present signal 519 from communication controller 506 and signal 519 are "00H"
The selector 72 is switched according to the output of the comparator 73, and the communication controller 506
To read the contents of the coordinate memory 45. This allows
The value of the address counter 507 indicating the address for storing the data from the digitizer controller 42 in the coordinate memory 45, "033H (address where coordinate data is stored next: final data storage address + 1)", is subtracted from the subtracter The address "32H" obtained by subtracting "1" is selected by the selector 72 and output to the coordinate memory 45. Thus, the address “032H” of the coordinate memory 45
The coordinate data (coordinate data corresponding to the point 620 in FIG. 6) stored in the memory is read by the communication controller 506 and output to the computer device 47.

FIG. 9 shows the digitizer 41 of the second embodiment.
5 is a flowchart showing a process executed in response to a coordinate data transmission request from the computer device 47, and this flowchart is a data creation unit 46 shown in FIG.
3 shows the flow of processing in.

In step S11, the communication controller 50
6, the communication controller 506 outputs a numerical value (0) instructed by the computer equipment 47 to the signal 519 when the transmission request of the mark data after pen-up from the computer equipment 47 and the data “0” are received (step S6). S
12). Next, in Step S13, the comparator 73
When it is determined that the data of the signal 519 is "0", the output of the selector 72 is switched. As a result, the value obtained by subtracting the output value of the address counter 507 by the subtractor 71 is output from the selector 72. Then, in step S14, the address read from the selector 72 is output to the coordinate memory 45, and the final coordinate data is read from the coordinate memory 45.

As described above, according to the second embodiment,
When the coordinate data is requested from the computer device 47 after the pen is moved up, the detailed coordinate data stored at the end of the coordinate memory 45 is read and output, so that the position where the pen is moved up can be more accurately determined. You can figure it out. If the coordinate data at the time of pen-up (coarse coordinate data) matches the last coordinate data (detailed coordinate data) stored in the coordinate memory, the matched coordinate data is retransmitted. To be done.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. The present invention can also be applied to the case where it is achieved by supplying a program for implementing the present invention to a system or an apparatus.

As described above, this embodiment has the following effects. (1) In response to a request from a connected computer device, the number of points of coordinate data sampled per predetermined time can be increased and output to the computer device. Therefore, in subsequent processing based on the coordinate data,
The accuracy of coordinate data to be handled can be improved, and for example, in a character recognition device or the like, there is an effect that the recognition rate of input handwritten characters is increased.

Further, in the case of inputting handwritten characters or figures, good results such as smoothing of the locus of handwriting input by handwriting can be obtained.

Further, unlike the conventional case, since the number of interrupts required for fetching coordinate data is not increased in the computer device, there is no fear that the speed of the processing executed by the computer device at that time will be reduced. Due to this, for example, in computer equipment, the display becomes slow,
There is no problem that the time required for character recognition becomes long. (2) Regardless of the processing capability of the computer device to which this digitizer is connected, the optimum coordinate data acquisition interval by the digitizer can be set.

Further, since the computer equipment requests the detailed coordinate data from the digitizer for the convenience of its own processing, the influence of the transfer of the detailed coordinate data to the computer equipment on the processing of the computer equipment hardly poses a problem. . (3) According to the second embodiment, the position of the pen-up can be grasped more accurately, so that, for example, the character recognition rate becomes higher in the subsequent processing in the computer device, or the end of the trajectory of writing is changed. It has the effect of being closer to the position of the pen-up.

[0056]

As described above, according to the present invention, it is possible to output coordinate data with high resolution to a computer device without reducing the processing speed of the connected computer device.

Further, according to the present invention, in response to a coordinate data transmission request from a connected computer device, coordinate data with a higher sampling density can be output to the computer device.

Further, according to the present invention, when the coordinate position is instructed by a coordinate pointing tool such as a pen, the coordinates closer to the position where the coordinate pointing by the coordinate pointing tool is stopped according to the instruction from the computer device. It has the effect of outputting data.

[0059]

[Brief description of drawings]

FIG. 1 is a diagram for explaining an output example of detailed coordinate data in the first embodiment of the present invention.

FIG. 2 is a diagram illustrating plot points based on coordinate value data when the sampling timing of coordinate data is rough.

FIG. 3 is a diagram illustrating sampling / sampling according to a second embodiment of the present invention.
It is a figure explaining the point group based on coordinate data in case timing is rough.

FIG. 4 is a block diagram showing a schematic configuration of a coordinate input device (digitizer) of one embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a processing unit in the coordinate input device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a point group in which a coordinate data group sent from the coordinate input device according to the first embodiment of the present invention is plotted.

FIG. 7 is a flowchart showing a process in the coordinate input device according to the first embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a processing unit in the coordinate input device according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing a process in the coordinate input device according to the second embodiment of the present invention.

[Explanation of symbols]

 41 digitizer 42 digitizer controller 44 processing unit 45 coordinate memory 46 data creation unit 47 computer equipment 501, 506 communication controller 502 data buffer 503 X coordinate data area 504 Y coordinate data area 505 pen up / down flag 507, 508 address counter 509 Buffer 510 Lower 2 bit counter of sending side address 531 Subtractor

Front page continuation (72) Inventor Katsuhiko Nagasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (10)

[Claims] 1. A coordinate data processing device for outputting coordinate data indicating a designated coordinate position to a connected computer device, the coordinate data generating device generating coordinate data indicating the designated coordinate position at predetermined time intervals. Data generating means, storage means for sequentially storing the coordinate data generated by the coordinate data generating means, and reading means for thinning and reading the coordinate data stored in the storage means at predetermined intervals and outputting the thinned-out coordinate data to the computer device. Receiving means for receiving a transmission request for coordinate data from the computer device; and reading coordinate data stored in the storage device according to the transmission request received by the receiving device and outputting the coordinate data to the computer device. A coordinate data processing device, comprising: 2. The coordinate data transmission request specifies coordinate data stored temporally before the position of the final data with respect to the position of the final coordinate data received by the computer device. Claim 1 characterized by
The coordinate data processing device described in. 3. The coordinate data processing device indicates a coordinate position by pointing a coordinate input surface with a coordinate pointing tool, and the transmission request is immediately before the computer apparatus stops the coordinate pointing operation by the coordinate pointing tool. The coordinate data processing device according to claim 1, wherein the coordinate data is information requesting transmission. 4. The transmission request includes information for specifying coordinate data to be transmitted, and the control means continuously reads a plurality of coordinate data from the specified coordinate data from the storage means and the computer device. The coordinate data processing device according to claim 1, wherein the coordinate data processing device outputs the coordinate data. 5. The storage means includes a dual port memory, and a write address generating means for generating a write address of the coordinate data generated by the coordinate data generating means to the dual port memory; The coordinate data processing device according to claim 1, further comprising a read address generating unit that generates a read address of the coordinate data. 6. A coordinate data processing method for outputting coordinate data indicating a designated coordinate position to a connected computer device, wherein the coordinate data indicating the designated coordinate position is generated at predetermined time intervals. And a step of sequentially storing the generated coordinate data in a memory, a step of thinning out and reading out the coordinate data stored in the memory at a predetermined interval, and outputting the coordinate data to the computer device, coordinate data from the computer device And a step of receiving coordinate data stored in the memory and outputting the coordinate data to the computer according to the transmission request. 7. The coordinate data transmission request specifies that the coordinate data stored temporally prior to the position of the final data is received with reference to the position of the final coordinate data received by the computer device. Claim 6 characterized by the above-mentioned.
The coordinate data processing method described in. 8. The coordinate data processing device indicates a coordinate position by instructing a coordinate input surface with a coordinate pointing tool, and the transmission request is made immediately before the computer apparatus stops the coordinate pointing operation by the coordinate pointing tool. 7. The coordinate data processing method according to claim 6, wherein the coordinate data is information requesting transmission. 9. The transmission request includes information for specifying coordinate data to be transmitted, and a plurality of coordinate data are continuously read from the memory from the specified coordinate data and output to the computer device. Claim 6
The coordinate data processing method described in. 10. The coordinate data processing method according to claim 6, wherein the memory includes a dual port memory.