JP2010239469A - Handwritten input/display device, and whiteboard sharing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handwritten input/display device for protecting previously handwritten drawing information and facilitating erasing operation, and a whiteboard sharing system capable of erasing drawing information that is manually written on the shared whiteboard by another user. <P>SOLUTION: The handwritten input/display device keeps a settable user ID; stores the drawing information in a drawing information storage part in association with the user ID when the drawing information is stored in the drawing information storage part; and erases, in response to input of an erasing object range, drawing information corresponding to the erasing object range out of the stored drawing information and associated with a user ID that is kept or newly selected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a portable handwritten input display device, and a plurality of operators via a handwritten input display device on a virtual handwritten medium such as an electronic blackboard or a whiteboard provided on a network. The present invention relates to a whiteboard sharing system that exchanges information with each other by editing drawing information.

  The handwriting input display device is also called a note tool. By carrying it as a portable terminal, you can take notes as much as your memory capacity allows without having to carry many paper notes. There is an advantage that can be freely recombined. On the other hand, a technique is known in which a plurality of users share electronic whiteboards, electronic blackboards, and the like via a communication network by using their handwritten input display devices.

  Patent Document 1 discloses an electronic blackboard display in which the floor control unit gives a floor to only one participant input device and does not give a floor to other participant input devices in accordance with instructions from the moderator input device. By displaying on the electronic blackboard the content of the speech input from the participant input device to which the department has been given the right to speak, the content of the speech cannot be written on the electronic blackboard without permission, and the proceedings can proceed smoothly It is said.

  Japanese Patent Application Laid-Open No. 2004-228867 has a means for superimposing and displaying a selected layer on a shared screen, a means for storing a layer associated with each information terminal and information related to the layer, and a layer information acquisition request from the information terminal It is easy to determine from which terminal the annotation was made because only the drawing object drawn in the specified layer is selected and displayed by the configuration having the means for distributing the layer information managed by Yes.

JP-A-6-243084 JP 2008-24505 A

  However, in a conventional handwritten input display device such as an electronic whiteboard, there is a risk that other users or previously drawn drawing information may be mistakenly erased, and there is a problem that the drawing information is not sufficiently protected. In addition, the handwriting input display device has a problem that it is difficult to select conventional single-color drawing information, and it is difficult to identify and organize hold and description information. Also, when deleting the drawing information once displayed with an eraser or blackboard eraser tool, it takes time to trace the described place again, and the erasing range so that a large area can be erased at once. If the value is increased, there is a risk of accidental erasure of unintended areas. Conversely, if the erase area of the eraser tool is reduced, the number of times of tracing for erasure will increase.

  On the other hand, in a form in which a plurality of participants share an electronic whiteboard, an electronic blackboard, or the like via a network using such a handwriting input display device, a control technology related to a right that a certain participant can write by hand, that is, a speaking right is conventionally known However, no control technology related to the erasure right for erasing the contents handwritten by other participants was provided.

  An object of the present invention is to provide a handwritten input display device that protects previously drawn handwritten drawing information and facilitates an erasing operation, and erases drawing information handwritten by other users on a shared whiteboard It is to provide a whiteboard sharing system that can do this.

  A handwriting input display device according to the present invention includes a pen input unit that captures drawing information according to a drawing operation of an input pen on the tablet unit, a drawing information storage unit that stores the drawing information, and the drawing information displayed on the tablet unit. A handwriting input display device comprising: a tablet display unit that holds a user ID that can be set; and the drawing information stored in the drawing information storage unit when the drawing information is stored in the drawing information storage unit. Control means for storing in association with the ID, and corresponding to the erasure target range among the drawing information stored in the drawing information storage unit according to the erasure target range input, and retained at the time of the erasure target range input And erasing means for erasing the drawing information associated with the user ID.

  The whiteboard sharing system according to the present invention is a drawing information sharing means for sharing the drawing information as drawing information drawn on an electronic whiteboard between a plurality of the handwriting input display devices described above and each of the handwriting input display devices. And editing right management means for giving an editing right capable of erasing at least a part of the drawing information of the electronic whiteboard to any one of the handwriting input display devices.

  According to the handwriting input display device and the whiteboard sharing system according to the present invention, the drawing information is stored in association with the user ID. This protects the previously drawn drawing information and facilitates the erasing operation. In addition, when the drawing information on the electronic whiteboard is shared with other users, the drawing information handwritten by other users can be erased.

It is a front view which shows the 1st Example by this invention and shows the external appearance of a note tool. It is a block diagram which shows the function structure of the note tool shown in FIG. FIG. 3 is a block diagram illustrating a content example of each of a drawing information storage unit and a setting information holding unit illustrated in FIG. 2. It is a figure which shows the mode transition of a note tool, and the mode transition mode. It is a figure which shows the relationship between a closed curve and the deletion range. It is a figure which shows the relationship between a handwritten character and the corrected recognition character. It is a block diagram which shows the 2nd Example of this invention and shows the whole structure of a whiteboard shared system. It is a block diagram which shows the internal structure of the communication terminal shown by FIG. It is a figure which shows the mode of a state transition and mode transition of a note tool in the case of sharing drawing information.

  Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First embodiment>
FIG. 1 shows a first embodiment according to the present invention and shows the appearance of a note tool. The note tool 30 corresponds to a handwriting input display device according to the present invention, and includes a main body 31 and an input pen 32. The main body 31 includes a tablet unit 317 that captures drawing information drawn by operating the input pen 32 and displays the fetched drawing information as it is, and various operation buttons.

  The various operation buttons include a power button 33 for turning on / off the apparatus power, a correction ON / OFF button 34 for correcting already captured information, and a shared drawing information storage set on an external communication network. The edit transmission right ON / OFF button 35 for turning on / off the edit transmission right for the section (see FIG. 7), the color palette button 36 for specifying the color when displaying the drawing information, and the character cursor are moved. A cross key button 37 for zooming in, a zoom in / out button 38 for enlarging or reducing the drawing information when displaying the drawing information, a stroke width adjusting button 39 for adjusting the width of the stroke drawn by the pen, An erase mode button 310 for erasing the drawing information once captured and displayed, and an inner erase button for erasing the inside of the closed curve in the erase mode. 311, an outer erasing button 312 for erasing the outside of the closed curve in the erasing mode, a page moving button 313 for moving the display page when drawing information is stored in units of pages, and the page number currently being displayed , A page display unit 314 for displaying, a cancel button 315 for withdrawing the latest operation content, a hold (HOLD) button 316 for holding the current display content, and confirmation for confirming the latest operation content A button 318 is provided.

  FIG. 2 shows a functional configuration of the note tool 30 shown in FIG. The note tool 30 controls operations corresponding to pressing of various control buttons, and controls to store the drawing information in association with the user ID when storing the drawing information in the drawing information storage unit 44. A control unit 41, a character recognition unit 42 for recognizing a handwritten character and converting it into an encoded recognition character, and correcting the display size of the recognized character or correcting the thickness of the drawn line according to the size of the handwritten character A drawing information storage unit 44 for storing the drawing correction unit 43 to be performed, a captured handwritten character or handwritten drawing line and a recognized character obtained by character recognition, and setting information such as a user ID of the user and a standard display specification. A setting information storage unit 45, a clock function unit 46 that generates an input time attached to the drawing information, and a tablet display unit 47 that displays the drawing information stored in the drawing information storage unit 44. Includes a pen input unit 48 to capture the input pen 32 in cooperation with strokes, the input-output interface 49 for connecting to an external communication terminal and a network, a power supply 410 for supplying power to each unit, the.

  FIG. 3 shows an example of the contents of each of the drawing information storage unit 44 and the setting information storage unit 45.

  The drawing information storage unit 44 includes, for example, a page number of drawing information, coordinates of each drawing line and characters constituting the drawing information, color, correction ON / OFF setting, input time, and user ID. As the user ID, the content set in the setting information storage unit 45 at the time when drawing information is captured is used. Thereby, drawing information and a user ID are linked | related.

  The setting information storage unit 45 is a standard drawing line color and line width, line drawing and character correction ON / OFF setting, display magnification, font type and size of the corrected character when character correction is ON, It includes the user ID and presence / absence of edit transmission right. The user ID is identification information that can be arbitrarily set in advance by the user. Having the edit transmission right means that when the drawing information is shared by a plurality of note tools, the own note tool has the edit right for the shared drawing information. The presence / absence of the edit transmission right is set by the operation control unit 41 according to time. For example, the operation control unit 41 requests the external management server (see FIG. 7) to grant the editing right in response to pressing of the editing / transmission right ON / OFF button 35, and determines whether the editing / transmission right is present or not according to the result. Set.

  FIG. 4 shows the state transition and mode transition of the note tool 30. Here, it is assumed that the note tool 30 is used alone, that is, as a stand-alone type device. As a premise, in the initial state S1, it is assumed that the user ID of the user is arbitrarily set in advance in the setting information storage unit 45 of the note tool 30 by an operation such as character input. Hereinafter, the operation of the note tool 30 will be described with reference to the components shown in FIGS. 1 and 2 as appropriate.

  When the power button 33 of the note tool 30 is pressed in the initial state S1, the note tool 30 is activated in the single editing state S2. At this time, the first page is displayed on the tablet unit 317 at the first activation, but when the drawing information is already stored, for example, the last page or the next page of the blank page where the drawing information exists is displayed. In the single editing state S2, the user can input arbitrary drawing information, for example, a drawn line or a character. The drawing information is given the user ID set in the setting information storage unit 45 together with the input time and stored in the drawing information storage unit 44. When the power button 33 of the note tool 30 is pressed again, the power is turned off and the process returns to the initial state S1.

  In the single editing state S2, the user presses the delete mode button 310 to delete the already input content. When the erase mode button 310 is pressed, the note tool 30 shifts to a mode M1 for selecting a color to be erased. The user selects a desired color such as black only, red only, black and blue, or all colors using the color palette button 36 and presses the confirm button 318. In response to this, the note tool 30 shifts to the mode M2 for selecting the erasure target range. If the cancel button 315 is pressed before the confirm button 318 is pressed, the process returns to the single editing state S2.

  In mode M2, it is assumed that the user directly inputs a closed curve to the display screen by pen input. The note tool 30 stores all coordinates constituting the closed curve as closed curve data. The closed curve data in this case is an accumulation of a plurality of coordinate points that do not include thickness information, and is recorded as data that always has adjacent coordinate points in any of the eight directions of up, down, left, and right of each coordinate point. Depending on the user's operation, there may be a portion protruding from the closed curve at the beginning and end of writing. In this case, the protruding portion is excluded from the closed curve data (see FIG. 5A). If the cancel button 315 is pressed, the process returns to the single editing state S2.

  When the user draws a closed curve, the user presses the confirm button 318 to confirm the erasure target range. Thereafter, when the user presses the inner erasing button 311 or the outer erasing button 312, the drawing information that meets the erasing conditions is actually erased. Here, the drawing information that conforms to the erasing condition is drawing information that conforms to the selected color and erasing range, and that has a user ID that matches the user ID set in the setting information storage unit 45. Means information. Next, the process proceeds to the original single editing state S2.

  Since there are many operations for determining the erasing condition consisting of the color and the erasing range, a separate button called “undo” is provided to shift to a state in which the previous erasing condition is not finalized. There may be a mechanism. In addition, by accumulating the operation history in the note tool 30, this undo button may be used for processing to return each operation in the single editing state S2 to the previous state.

  FIG. 5 shows the relationship between the closed curve and the erase range. There can be two inner and outer erase ranges defined by each of the closed curves L1 and L2. When the inner erasing button 311 button is pressed, the drawing information that matches the erasing condition consisting of the selected color and the set user ID among the drawing information of the coordinates inside the closed curve L1 or L2 and on the line is the drawing information. It is erased from the storage unit 44. When the outer erasing button 312 button is pressed, drawing information that conforms to the same erasing condition is erased from the drawing information storage unit 44 among the drawing information of coordinates outside the closed curve L1 or L2. As a result of erasing from the drawing information storage unit 44, the drawing information is also erased from the display of the tablet unit 317.

  Several methods can be used for determining whether a certain coordinate point is inside or outside the closed curve L1 or L2. For example, for each coordinate point included in the closed curve L2, the presence and the number of coordinate points that exist at the Y coordinate adjacent to the Y coordinate of the coordinate point and are included in the closed curve L2 are determined. For example, when viewing the coordinate point P1 on the closed curve L2, the coordinate point P2 and the coordinate point P3 exist on the Y coordinate y2 located adjacent to the Y coordinate y1 of the coordinate point P1. In this case, the region sandwiched between the coordinate point P2 and the coordinate point P3 and the other region are distinctly distinguished. Hereinafter, by repeating this process for each coordinate point included in the closed curve L2, the inner and outer regions can be distinguished.

  FIG. 6 is a diagram illustrating the relationship between handwritten characters and corrected recognized characters. The relationship between the two will be described with reference to the components shown in FIG.

  As shown in (a) of FIG. 6, the handwritten input drawing character “sales promotion” is displayed by a drawn line. When the correction ON / OFF button 34 is pressed, the character recognition unit 42 of the note tool 30 recognizes the handwritten character “sales promotion” and acquires the encoded “sales promotion” as a recognized character. A well-known technique can be used for the method of character recognition. The drawing correction unit 43 sets the coordinate point P1 that maximizes the Y coordinate value and minimizes the X coordinate value among the coordinate points of the drawing information that constitutes the handwritten character “sales promotion”, and the Y coordinate value. The coordinate point P2 that minimizes and maximizes the value of the X coordinate is recognized.

  As shown in (b) of FIG. 6, the drawing correction unit 43 then defines a rectangle A (that is, a handwritten region) whose diagonal is a line segment between the coordinate point P1 and the coordinate point P2, In this rectangle A, the recognized character “sales promotion” is displayed as the corrected character. The font type and size of the corrected character may be in accordance with the font type and size set in the setting information storage unit 45. Preferably, the corrected character size is automatically adjusted to the size of the rectangle A.

  As a modification, the drawing correction unit 43 shown in FIG. 2 converts the handwritten drawing line drawn by the input pen operation into straight line information including the coordinate start point and the coordinate end point in accordance with the operation of the correction ON / OFF button 34. The function to perform may be provided. The drawing information storage unit 44 stores the straight line information as drawing information to be displayed. Here, the drawing correction unit 43 uses the handwritten drawing line as straight line information on the condition that the deviation between the handwritten drawing line and the interpolation straight line connecting the coordinate start point and the coordinate end point of the handwritten drawing line is within a predetermined threshold. Convert.

  In the first embodiment described above, a portable note tool capable of designating a plurality of colors and stroke thicknesses is provided as a handwriting input display device. The handwriting input display device can also erase the data inside or outside the closed curve collectively by operating the erase mode button. The handwriting input display device can further perform character recognition on the handwritten character and display the recognized character with a font size that matches the size of the handwritten region with the font specified in the corresponding region. This makes it possible to perform intuitive operations in various display and deletion operations of drawing information.

<Second embodiment>
FIG. 7 shows a second embodiment of the present invention and shows the overall configuration of the whiteboard sharing system. Here, a mode is shown in which a user who performs a video conference using each of the communication terminals 20a and 20b shares a whiteboard using each of the note tools 30a and 30b. Only two communication terminals 20a and 20b and two note tools 30a and 30b are shown, but the maximum allowable number is not limited. The communication terminals 20a and 20b are connected to a communication network 50 such as the Internet using an IP protocol or an intranet in a company. The communication terminals 20a and 20b are ordinary communication terminals that can receive provision of a TV conference service. A service operator network 10 that provides a whiteboard sharing service is connected to the communication network 50.

  The service operator network 10 includes a shared drawing information storage unit 13 as an area for sharing the whiteboard with the user, and a management server 11 that manages each user's edit transmission right for the shared drawing information storage unit 13. . A user's edit transmission right includes a right to change not only drawing information written by the user but also drawing information written by other users, as well as a writing right to newly write to one virtual whiteboard. Includes erasure rights. The service operator network 10 is a network that is maintained and managed by an operator of the whiteboard shared service. The shared drawing information storage unit 13 may be installed alone or in each region in the world, or may be installed in a plurality of devices for load distribution or disaster countermeasures. The management server 11 includes an editing right management table 12 for managing the editing transmission right of each user with respect to the shared drawing information storage unit 13. The management server 11 sets a user ID for identifying a user who has the edit transmission right at the current time in the edit right management table 12.

  The assignment of the edit transmission right by the management server 11 may be matched with the assignment of the right to speak in the TV conference system service that can be performed using the communication terminals 20a and 20b, for example. Also, the edit transmission right is given to the communication terminal that has pressed the edit transmission right ON / OFF button 35 in any one of the communication terminals 20a and 20b, and the communication terminal presses the edit transmission right ON / OFF button 35 again. The edit transmission right may be maintained in the communication terminal until the edit transmission right is abandoned.

  In addition, the management server 11 may separately manage the right to write, change, and delete the entire drawing information of the electronic whiteboard among the edit transmission rights and / or manage the input person himself / herself. The right to write, the right to change, and the right to delete can be separately managed for the contents entered by a specific user. For example, the erasure right may be limited for the drawing information associated with a specific user ID.

  Each of the plurality of note tools 30a and 30b is connected to each of the communication terminals 20a and 20b, and displays the above virtual one whiteboard on the tablet unit and draws on the whiteboard using the input pen. Can do. The same drawing information drawn on the whiteboard is simultaneously displayed on the note tools 30a and 30b.

  FIG. 8 shows an internal configuration of the communication terminal 20 shown in FIG. Here, the communication terminal 20 includes a general-purpose computer main body 21, an output device 29 such as a display, a projector, a speaker, or a printer, and an input device 210 such as a keyboard, a mouse, or a microphone. The general-purpose computer main body 21 includes a power source 22, a memory 23, a processing unit (CPU) 24, an information storage device 25 such as a hard disk drive, a system bus, a memory bus, an input / output bus, or an expansion bus as a normal configuration. A bus 26, an input / output interface 27, and a communication interface 28 are provided. The notebook tool 30 is connected via an input / output interface 27. Thereby, the note tool 30 can access the management server 11 and the shared drawing information storage unit 13 in the service operator network 10 via the communication terminal 20 and the communication network 50.

  FIG. 9 shows the state transition and mode transition of the note tool 30 when drawing information is shared. Here, as a whiteboard in a TV conference, the note tool 30 synchronizes the contents of the shared drawing information storage unit with its own drawing information storage unit, and shares the same drawing information with other note tools. Hereinafter, the operation of the note tool 30 will be described with reference to the components shown in FIGS. 1, 2, and 7 as appropriate.

  When the power button 33 of the note tool 30 is pressed in the initial state S1, the note tool 30 is activated in the single editing state S2. At this time, the first page is displayed on the tablet unit at the first activation, but when drawing information already exists, for example, the last page having the drawing information or the next blank page is displayed. In the single editing state S2, the user can input arbitrary drawing information, for example, a drawn line or a character.

  When a video conference session is established in the communication terminal 20 to which the note tool 30 in the single edit state S2 is connected, the note tool 30 shifts to the display-only state S3. At this time, for example, when some information is recorded on the startup page in the single editing state S2, the next page is displayed. On the other hand, when nothing is recorded, for example, the startup page in the single editing state S2 is used as it is as a conference whiteboard.

  The procedure for establishing a TV conference session conforms to a call sequence of a conference call in SIP (Session Initiation Protocol) / IMS (Information Management System), for example. Here, following the call sequence, an RTP (Real-time Transport Protocol) session for an audio signal and a video signal is established, and a dedicated RTP session for sharing a whiteboard is established at a different port number. The

  In the display-only state S3, the note tool 30 displays the contents of the digital whiteboard as default settings according to the setting contents of the setting information storage unit 45. The default settings include, for example, the stroke color is black, the stroke width is standard, the stroke and character correction is OFF, the display magnification is 100% (that is, full screen display), and the correction is performed when character correction is ON. It is assumed that the font type and size of the character are Gothic and 10 pt, respectively, and there is no “edit transmission right” at the start of the session. By matching the contents of the default settings in the note tools of all users participating in the conference, all users can visually recognize the whiteboard in the same display form.

  In the display-only state S <b> 3, the note tool 30 unilaterally receives editing contents by other users, accumulates the edited drawing information in its own drawing information storage unit 44, and displays it on the tablet unit 317. When there is drawing information with overlapping coordinate points, the drawing information having the latest time information is displayed on the top layer on the screen layer. Further, a page movement command may be received directly or via the management server 11 from another note tool whose edit transmission right is ON, and a page to be automatically displayed may be moved in accordance with this command.

  When the operator presses the edit transmission right ON / OFF button 35 in the display-only state S3, the note tool 30 shifts to the conference edit state S4. In the conference editing state S4, the user who is given the editing right can input arbitrary drawing information, for example, a drawing line or a character. The edited content is temporarily stored in its own drawing information storage unit 44 and also reflected in the shared drawing information storage unit 13 through a dedicated RTP session for sharing the whiteboard. The contents of the shared drawing information storage unit 13 are reflected on other users' note tools via a dedicated RTP session. The drawing information stored in the shared drawing information storage unit 13 includes not only the contents of the drawing information but also the edited user ID. As a result, the drawing information designating the user can be erased.

  In the conference editing state S4, the user presses the delete mode button 310 to delete the displayed content. When the erase mode button 310 is pressed, the note tool 30 shifts to a mode M1 for selecting a color to be erased. The user selects a desired color such as black only, red only, black and blue, or all colors using the color palette button 36 and presses the confirm button 318. In response to this, the note tool 30 shifts to a mode M2 for selecting a deletion target user. If the cancel button 315 is pressed before the confirm button 318 is pressed, the process returns to the single editing state S2. If the cancel button 315 is pressed before the confirm button 318 is pressed, the process returns to the conference editing state S4.

  In the mode M2 for selecting a user to be erased, a list of users in a meeting is displayed on the input screen of the tablet unit 317, and the user is confirmed by pressing the confirm button 318 after selecting a user to be erased. In response to this, the note tool 30 shifts to a mode M3 for selecting an erasure target range. If the cancel button 315 is pressed before the confirm button 318 is pressed, the process returns to the conference editing state S4.

  Since the operation after the mode M3 for selecting the erasure target range is the same as the operation described in the first embodiment, the description thereof is omitted. When the TV conference session is disconnected in the display-only state S3 or the conference editing state S4, the note tool 30 returns to the single editing state S2. When the power button 33 is pressed again in the single editing state S2, the display-only state S3, and the conference editing state S4, the power is turned off and the initial state S1 is restored.

  In the second embodiment described above, there is provided a whiteboard sharing system in which a plurality of users share a whiteboard using a note tool that is a drawing information input display device. As a result, a large number of participants, such as a TV conference, can hold a conference through one white boat, and the drawing information already written on the white boat can be erased to an arbitrary user's note tool at any time. By giving the edit transmission right, the meeting can be smoothly performed.

  In the above second embodiment, the shared drawing information storage unit is arranged on the external network, and the shared drawing information is distributed by the server / client method. There is no limitation, and a plurality of note tools may share drawing information having substantially the same content by directly exchanging drawing information between each of the plurality of note tools in a peer-to-peer manner. .

  Moreover, in the above 2nd Example, although the form where a user shared a white hoe using a note tool was shown while participating in a TV conference using a communication terminal, the limitation concerning this invention is shown. In addition, the user can use a white tool without using a communication terminal by using a note tool having a network communication function.

DESCRIPTION OF SYMBOLS 10 Service operator network 11 Management server 12 Editing right management table 13 Shared drawing information storage part 20, 20a, 20b Communication terminal 30 30a, 30b Note tool 31 Main body 32 Input pen 33 Power button 34 Correction ON / OFF button 35 Edit transmission Right ON / OFF button 36 Color palette button 37 Four-way key button 38 Zoom in / out button 39 Stroke width adjustment button 310 Erase mode button 311 Inside erase button 312 Outside erase button 313 Page move button 314 Page display button 315 Cancel button 316 Hold button 317 Tablet unit 318 Confirm button 41 Operation control unit 42 Character recognition unit 43 Drawing correction unit 44 Drawing information storage unit 45 Setting information storage unit 46 Clock function unit 47 Tablet display unit 48 Pen input Power unit 49 I / O interface 410 Power supply

Claims (10)

Handwriting comprising: a pen input unit that captures drawing information according to a drawing operation of the input pen on the tablet unit; a drawing information storage unit that stores the drawing information; and a tablet display unit that displays the drawing information on the tablet unit An input display device,
Holding means for holding a configurable user ID;
Control means for storing the drawing information in association with the user ID when the drawing information is stored in the drawing information storage unit;
A drawing corresponding to the erasure target range in the drawing information stored in the drawing information storage unit in response to the erasure target range input and associated with the user ID held at the time of the erasure target range input An erasing means for erasing information;
A handwritten input display device comprising:   The image processing apparatus further includes drawing information sharing means for sharing drawing information stored in the drawing information storage unit with another handwritten input display device via a communication network, wherein the erasing means stores drawing information corresponding to the erasure target range. 2. The handwritten input display device according to claim 1, wherein the drawing information associated with the newly selected user ID is deleted regardless of the user ID held by the holding means.   3. The handwriting input display device according to claim 1, further comprising color selection means for selecting a color to be erased, wherein the erase means erases drawing information of the selected color.   The handwriting input display device according to claim 1, wherein the erasing unit defines the erasure target range by a closed curve drawn by a drawing operation of the input pen.   The apparatus further comprises character recognition means for converting handwritten characters drawn by the input pen operation into encoded recognition characters, and the drawing information storage unit stores the recognition characters as the drawing information. Item 3. The handwritten input display device according to Item 1 or 2.   6. The handwriting input display device according to claim 5, further comprising a drawing correction unit for adjusting a display size of the recognized character to a drawing size of the handwritten character.   A straight line recognizing unit that converts the handwritten drawn line drawn by the input pen operation into straight line information including a coordinate start point and a coordinate end point; and the drawing information storage unit stores the straight line information as the drawing information. The handwritten input display device according to claim 1 or 2, characterized in that   The straight line recognizing means converts the handwritten drawn line into the straight line information on condition that a deviation between the handwritten drawn line and an interpolation straight line connecting the coordinate start point and coordinate end point of the handwritten drawn line is within a predetermined threshold. The handwritten input display device according to claim 7.   A drawing information sharing means for sharing the drawing information as drawing information drawn on an electronic whiteboard between the plurality of handwritten input display devices according to claim 1 and each of the handwritten input display devices, and the electronic whiteboard A whiteboard sharing system, comprising: an editing right management means for giving any of the handwriting input display devices an editing right capable of erasing at least a part of the drawing information.   The editing right management means manages the entire writing right, changing right and erasing right of the drawing information of the electronic whiteboard separately, and / or contents input by a specific user including the input person itself The whiteboard sharing system according to claim 9, wherein a writing right, a changing right, and an erasing right are managed separately.

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