KR101014735B1 - Apparatus for providing writing function - Google Patents

Apparatus for providing writing function Download PDF

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Publication number
KR101014735B1
KR101014735B1 KR1020100003841A KR20100003841A KR101014735B1 KR 101014735 B1 KR101014735 B1 KR 101014735B1 KR 1020100003841 A KR1020100003841 A KR 1020100003841A KR 20100003841 A KR20100003841 A KR 20100003841A KR 101014735 B1 KR101014735 B1 KR 101014735B1
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South Korea
Prior art keywords
bezier curve
distance
unit
point
split point
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KR1020100003841A
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Korean (ko)
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김도영
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김도영
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
    • G06F3/04817—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance using icons
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
    • G06F3/0482—Interaction with lists of selectable items, e.g. menus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/048—Indexing scheme relating to G06F3/048
    • G06F2203/04808—Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen

Abstract

PURPOSE: An apparatus for providing a writing function for producing a Bezier curve is provided to reduce necessary storage for storing a writing contents required for the computation of the Bezier curve. CONSTITUTION: A fitting unit(130) calculates a Bezier curve corresponding to vertex information. A partition point detection unit detects a division point corresponding to the Bezier curve. A distance calculating unit produces the division distance between the division point and a straight line which both points of the Bezier curve are connected. A linearization determining unit makes the Bezier curve be a straight line.

Description

Apparatus for providing writing function

Embodiments of the present invention relate to writing techniques, and more particularly, to writing techniques using Bezier curves.

Recently, e-books released by device manufacturers are similar in texture to paper books, small, light, and without eye strain, and can carry a lot of books. If you combine writing function with e-book, it can be used for reading and memorizing books and lectures, and underlining. If you use it for schedule, diary, memo or sketch, you can carry books, diary and sketch space together. It can make a difference.

In general, writing functions in an embedded device have been implemented in a raster manner in which vertices corresponding to user input are stored and connected to vertices. However, when the storage space required for storing the vertices is increased, and the writing content is enlarged according to the user's input, the sharpness thereof is deteriorated.

In order to solve this problem, writing functions based on vector graphics with high data compression ratio and guaranteed writing quality intended by the user are being studied. However, if writing is implemented based on vector graphics, the process of creating and storing curves and rendering vector data has to go through a slower process than implementing based on raster graphics.

Embodiments of the present invention provide a writing function providing apparatus for calculating a Bezier curve by filtering a vertex according to a user input.

In addition, embodiments of the present invention to provide a writing function providing apparatus for straightening a portion of the Bezier curve according to the user's input.

According to an aspect of the invention, the selection unit for selecting three consecutive vertices included in the vertex information; A distance calculator configured to calculate a filtering distance between the straight line connecting the two ends and the middle vertex; A removal unit to remove the intermediate vertex from the vertex information when the filtering distance corresponding to the first vertex is equal to or less than a specified value; And a fitting unit configured to calculate a Bezier curve corresponding to the vertex information.

The selector may repeatedly select three vertices included in the vertex information, and select a combination of vertices different from a previously selected vertex.

The filtering distance may be a minimum distance between the straight line connecting both ends of the vertex and the intermediate vertex.

The apparatus for providing a writing function includes an input unit configured to receive a writing input from a user and generate vertex information; And a display unit for rendering the Bezier curve and displaying the visual information.

According to another aspect of the invention, the fitting unit for calculating a Bezier curve corresponding to the vertex information; A split point detector for detecting a split point corresponding to the Bezier curve; A distance calculator configured to calculate a split point distance between a straight line connecting both end points of the Bezier curve and the split point; And a straightening determination unit for straightening the Bezier curve when the ratio between the splitting point and the total splitting point at which the splitting point distance is equal to or less than a specified value is equal to or greater than a predetermined ratio.

The split point detector may detect a split point that equally divides the Bezier curve by a specified number.

The split point distance may be a minimum distance between the straight line connecting both ends of the Bezier curve and the split point.

The straightening determiner may straighten the Bezier curve by deleting a control point corresponding to the Bezier curve.

According to another aspect of the invention, the filtering unit for removing the vertex having a filtering distance is less than the specified value in the vertex information; A fitting unit calculating a Bezier curve corresponding to the vertex information; And a straightening unit for straightening the Bezier curve when the ratio between the number of splitting points corresponding to the Bezier curve and the splitting point whose split point distance is equal to or less than a specified value is greater than or equal to the specified ratio.

Embodiments of the present invention can calculate the Bezier curve using the filtered vertices, thereby reducing the computational complexity and storage space required to store the writing content required for the Bezier curve calculation.

Embodiments of the present invention can improve the response speed of rendering and displaying writing content at a user's input point by straightening a portion of the Bezier curve.

1 is a diagram illustrating a writing function providing apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a filtering unit of a writing function providing apparatus according to an embodiment of the present invention.
3 is a view for explaining a filtering distance according to an embodiment of the present invention;
Figure 4 illustrates a straightening unit of the writing function providing apparatus according to an embodiment of the present invention.
5 is a diagram illustrating a split point distance calculated by an apparatus for providing a writing function according to an embodiment of the present invention.
6 is a view for explaining a fitting of the writing function providing apparatus according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating a time required to calculate a Bezier curve using a vertex to which filtering by a filtering unit of a writing function providing apparatus according to an embodiment of the present invention is applied.
8 is a view illustrating a time required when rendering a straightened Bezier curve through the straightening unit of the writing function providing apparatus according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a diagram illustrating an apparatus for providing a writing function according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for providing a writing function according to an embodiment of the present invention includes an input unit 110, a filtering unit 120, a fitting unit 130, a straightening unit 140, and a display unit 150.

The input unit 110 generates coordinate information (hereinafter, referred to as vertex information) of vertices according to a user's writing input. At this time, the vertex information includes coordinate information corresponding to each vertex in the order of vertices according to the writing input. In this case, the input unit 110 may include a module that can receive a writing input through a touch input from the user. The input unit 110 transmits the generated vertex information to the filtering unit 120.

The filtering unit 120 selects three consecutive vertices included in the vertex information, and calculates a distance (hereinafter, referred to as a filtering distance) between a straight line connecting the first vertex and the third vertex among the selected three vertices. . The filtering unit 120 removes the second vertex from the vertex information when the filtering distance is equal to or less than a specified value (hereinafter, referred to as a filtering reference value). Hereinafter, the filtering process of the filtering unit 120 will be described in detail with reference to FIGS. 2 and 3. The filtering unit 120 transmits the filtered vertex information to the fitting unit 130.

The fitting unit 130 calculates a Bezier curve close to the vertex included in the vertex information. That is, the fitting unit 130 estimates a Bezier curve corresponding to the vertex, and calculates an average of the distances between the Bezier curve and each vertex (hereinafter, referred to as a fitting error). Subsequently, the fitting unit 130 deforms the Bezier curve by moving a control point of the Bezier curve. The fitting unit 130 calculates a fitting error corresponding to the modified Bezier curve. The fitting unit 130 repeatedly performs the deformation of the Bezier curve and the fitting error calculation process, and then selects the Bezier curve corresponding to the minimum value of the calculated fitting error. A process of calculating the Bezier curve of the fitting unit 130 will be described in detail later with reference to FIG. 6. The fitting unit 130 transmits the information corresponding to the calculated Bezier curve (hereinafter referred to as Bezier curve information) to the straightening unit 140. At this time, the Bezier curve information includes coordinates of the base point and the control point. The base point means a start point at which the Bezier curve starts and an end point at which the Bezier curve ends.

The straightening unit 140 calculates a point (hereinafter, referred to as a splitting point) for evenly dividing the Bezier curve according to the received Bezier curve information into a predetermined number of curves. The straightening unit 140 calculates a distance (hereinafter, referred to as a split point distance) between a straight line connecting two basic points of the Bezier curve and each split point. The straightening unit 140 calculates a ratio of the number of splitting points at which each calculated splitting point distance is equal to or less than a specified reference distance value and the total number of splitting points. When the calculated ratio is equal to or greater than the specified reference ratio, the straightener 140 deletes the control points of the Bezier curve and straightens it. The straightener 140 transmits Bezier curve information to the display 150.

The display unit 150 renders each Bezier curve according to the received Bezier curve information and provides the user in the form of visual information. In this case, the display unit 150 may include a display module such as an LCD and an LED.

Although the above-described writing function providing apparatus has been described as including both the filtering unit 120 and the straightening unit 140, the writing function providing apparatus according to the implementation method, only one of the filtering unit 120 and the straightening unit 140 It may include.

2 is a diagram illustrating a filtering unit of an apparatus for providing a writing function according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a filtering distance according to an embodiment of the present invention.

Referring to FIG. 2, the filtering unit 110 according to an embodiment of the present invention includes a selecting unit 210, a distance calculating unit 220, and a removing unit 130.

The selecting unit 210 selects three consecutive vertices among vertices (vertexes according to writing input) corresponding to the coordinate information included in the vertex information, and calculates coordinate information on the selected three vertices from the distance calculating unit 220. To send.

The distance calculator 220 receives coordinate information about three vertices from the selector 210. The distance calculator 220 calculates a filtering distance that is a distance between a second straight line (hereinafter referred to as a filtering straight line) connecting the first and third vertices among three consecutive vertices corresponding to the received coordinate information. do. The distance calculator 220 transmits the filtering distance and the vertex information to the remover 230. Referring to FIG. 3, the distance calculator 220 calculates a distance between the filtering straight line connecting the first P1 and the second vertex P3 and the second vertex P2 among three consecutive vertices.

Referring back to FIG. 2, the remover 230 removes vertices having a received filtering distance equal to or less than a filtering reference value from the vertex information. That is, the remover 230 removes coordinate information corresponding to a vertex whose filtering distance is equal to or less than a filtering reference value from the vertex information. The remover 230 transmits vertex information from which the corresponding vertex is removed to the selector 210.

The selector 210 selects three consecutive vertices again from the vertex information received from the remover 230. At this time, the selection unit 210 does not reselect the three vertex combinations selected in the previous process. For example, the selector 210 selects the n, n + 1, n + 2 th vertices and then selects the n, n + 2, n + 3 th vertices when the n + 1 th vertex is deleted. The selector 210 selects n + 1, n + 2 and n + 3 vertices after selecting the n, n + 1, n + 2 th vertices and the n + 1 th vertex is not deleted.

The selector 210 repeats the selection process until there are no more vertex combinations to select. The distance calculator 220 and the remover 230 repeatedly perform the above-described process on the vertex selected by the selector 210.

4 is a diagram illustrating a straightening unit of a writing function providing apparatus according to an embodiment of the present invention, and FIG. 5 is a diagram illustrating a split point distance calculated by the writing function providing apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the linearization unit 140 of the apparatus for providing a writing function according to an embodiment of the present invention includes a split point detector 410, a distance calculator 420, and a linearization determiner 430.

The split point detector 410 divides the Bezier curves included in the Bezier curve information received from the fitting unit 130 evenly into a predetermined number. The split point detector 410 transmits coordinate information corresponding to the split point, which is the point at which the Bezier curve is split, to the distance calculator 420.

The distance calculator 420 calculates a split point distance, which is a distance between a straight line connecting two basic points of the beige curve and the split point. Referring to FIG. 5, the distance calculator 420 receives coordinate information of the split points 520 to 550 from the split point detector 410. The distance calculator 420 calculates a split point distance, which is a distance from a straight line connecting the basic points 510 and 560. The distance calculator 420 transmits the calculated split point distance to the straightening determiner 430.

The straightening determination unit 430 straightens the beige curve when the ratio of the number of splitting points having a split point distance equal to or less than a specified reference value and the total number of splitting points is equal to or greater than a specified value (hereinafter referred to as straightening reference ratio). For example, assuming that the splitting point distances corresponding to the splitting points 520 to 550 are 4, 3, 1, and 2, respectively, the reference value is 3 and the straightening reference ratio is 70%, the straightening determiner 430 divides. It is confirmed that the dividing points whose point distances are equal to or less than the reference value 3 are the dividing points 530, 540, and 550. The straightening determination unit 430 confirms that the ratio of the number 4 of the total split points and the number 3 of the split points 530, 540, and 550 is 70% or more, deletes the points located on the corresponding Bezier curve, and removes the corresponding Bezier curve. Create a straight line between the start and end points of.

6 is a view for explaining a fitting of the writing function providing apparatus according to an embodiment of the present invention.

Referring to FIG. 6, the fitting unit 130 of the apparatus for providing a writing function according to an embodiment of the present invention uses a Bezier curve Q (t) including n (natural numbers) control points by using Equation 1 below. Estimate.

[Equation 1]

Figure 112010002778717-pat00001

Where V i is the control point of the Bezier curve and B i , n (t) is the Bernstein polynomial for the n-th curve. Bernstein polynomials for n-th order curves are shown in Equation 2 below. In addition, when t = 0, it means the start point of a Bezier curve, and when t = 1, it means the end point of a Bezier curve.

[Equation 2]

Figure 112010002778717-pat00002

In this case, i may be 1 to n,

Figure 112010002778717-pat00003
May be expressed as Equation 3 below.

&Quot; (3) "

Figure 112010002778717-pat00004

Since the Bezier curve is evaluated by the de Casteljau recursive algorithm, the derivative of the k-th Bezier curve can be expressed as Equation 4 below by being based on the recursive property of the Bernstein polynomial.

&Quot; (4) "

Figure 112010002778717-pat00005

In this case, applying the starting point of t to 0 in Equation 4 leads to Equation 5 below.

[Equation 5]

Figure 112010002778717-pat00006

The fitting portion 130 compares the distance between the vertices t and Q (t) with a specified threshold. The fitting unit 130 determines the currently calculated Bezier curve as a Bezier curve corresponding to the vertices when the maximum value of the distance between the vertices t and Q (t) is less than or equal to the specified threshold. When the maximum value of the distance between the vertices t and Q (t) exceeds a specified threshold, the fitting unit 130 includes two bezels having the vertex corresponding to the maximum value and one base point of the current Bezier curve as a base point. Divides the currently calculated Bezier curve into curves. The fitting unit 130 divides the divided Bezier curve into two Bezier curves in the above-described process or determines the Bezier curve corresponding to the corresponding Bezier curves. That is, the fitting unit 130 repeats the above process recursively until the Bezier curve corresponding to all the vertices is determined.

For example, the fitting unit 130 calculates the slope vectors of the end points V 0 and V 3 of the vertex curve 610 using neighboring points V 1 and V 2 . Then the fitting portion 130 calculates the vertex V 1, U 1 and U 2 and the V 2 Bezier vertex of the chord-length parameterization of the curve 620 that corresponds to (hereinafter referred to as chopping vertex built). The fitting part 130 calculates the distance between V 1 and U 1 , V 2 and U 2 . The fitting unit 130 confirms that the distance between the maximum value V 1 and U 1 among the calculated distances is equal to or less than a specified threshold value, and the Bezier curve 620 is one Bezier curve corresponding to the vertices V 0 to V 3 . Confirm with If the distance between V 1 and U 1 exceeds a specified threshold, the fitting unit 130 has a Bezier curve having V 0 and V 1 as both ends and a Bezier having V 1 and V 3 as both ends. The Bezier curve 620 is divided into curves.

The fitting unit 130 may represent a Bezier curve calculation process as shown in the following pseudo code.

Claims (9)

delete delete delete delete A fitting unit for calculating a Bezier curve corresponding to the vertex information;
A split point detector for detecting a split point corresponding to the Bezier curve;
A distance calculator configured to calculate a split point distance between a straight line connecting both end points of the Bezier curve and the split point; And
And a straightening determination unit to straighten the Bezier curve when the ratio between the splitting point and the total splitting point at which the splitting point distance is equal to or less than a specified value is equal to or greater than a predetermined ratio.
The method of claim 5,
And the split point detector detects a split point that divides the Bezier curve evenly into a predetermined number.
The method of claim 5,
And the split point distance is a minimum distance between a straight line connecting both end points of the Bezier curve and the split point.
The method of claim 5,
And the straightening determining unit straightens the Bezier curve by deleting a control point corresponding to the Bezier curve.
A filtering unit to remove vertices having a filtering distance less than or equal to a predetermined value from the vertex information;
A fitting unit calculating a Bezier curve corresponding to the vertex information; And
And a straightening unit to straighten the Bezier curve when the ratio between the number of split points corresponding to the Bezier curve and the split point whose split point distance is equal to or less than a specified value is equal to or greater than a specified ratio.

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2023206257A1 (en) * 2022-04-28 2023-11-02 京东方科技集团股份有限公司 Handwriting generation method and apparatus, computer device, and readable medium

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JP2001034319A (en) 1999-07-26 2001-02-09 Mitsubishi Electric Corp Locus controller
JP2005173940A (en) 2003-12-10 2005-06-30 3D Media Co Ltd Image processing method, image processor and computer program
JP2006333361A (en) 2005-05-30 2006-12-07 Canon Inc Image processing device, control method thereof, and program
JP2009302758A (en) 2008-06-11 2009-12-24 Konica Minolta Business Technologies Inc Image processing device, image conversion method, and computer program

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001034319A (en) 1999-07-26 2001-02-09 Mitsubishi Electric Corp Locus controller
JP2005173940A (en) 2003-12-10 2005-06-30 3D Media Co Ltd Image processing method, image processor and computer program
JP2006333361A (en) 2005-05-30 2006-12-07 Canon Inc Image processing device, control method thereof, and program
JP2009302758A (en) 2008-06-11 2009-12-24 Konica Minolta Business Technologies Inc Image processing device, image conversion method, and computer program

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023206257A1 (en) * 2022-04-28 2023-11-02 京东方科技集团股份有限公司 Handwriting generation method and apparatus, computer device, and readable medium

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