JP4361118B2 - Information processing apparatus, information processing method, and program - Google Patents

Abstract

An information processing device enables shaggy to be inconspicuous in a short processing time without using data such as in a look-up table. The information processing device (1) includes a display control section (16) for determining the gray scale of the displaying pixels out of the pixels. The display control section (16) includes a distance calculating subsection (20), a gray-scale correcting subsection (21), and a display data generating subsection (22). A group of displaying pixels of one column arrayed in the direction of the line width, which are part of pixels constituting the displaying pixels of a symbol, is defined as an element pixel group. The distance calculating subsection (20) calculates the distance in the direction of the line width between an element line segment and the center point of each element pixel group including pixels overlapping with the element line segment. The gray-scale correcting subsection (21) corrects the gray scale of the pixel at one end included in the element pixel group containing the center point to a gray scale which is between a specified gray scale and the gray scale of the background of the displayed symbol and which corresponds to the calculated distance. The display data generating subsection (22) generates display data for displaying the symbol on a display screen according to the correction by the gray-scale correcting subsection (21).

Description

  The present invention relates to an information processing apparatus, an information processing method, and a program capable of displaying a symbol on a display screen using a stroke font.

  Conventionally, a stroke font which is a kind of scalable font is known. A scroll font is one of data formats for expressing the shape of a character on a computer. The scroll font is also a format for expressing the character shape as a center line (skeleton line) parameter (vector data).

  For example, Patent Document 1 discloses a character display device using a scroll font.

  In this character display device, characters are displayed on the display screen based on data indicating the skeleton of characters called skeleton data (that is, stroke font).

  FIG. 27 shows the data structure of the skeleton data. As shown in the figure, the skeleton data 100 includes a character code 101 for distinguishing character types, a stroke number 102 indicating the number of strokes constituting one character, and stroke information 103 corresponding to each stroke. include. In this example, one stroke corresponds to one stroke of the number of strokes of characters. In other words, the stroke is also a part of a character having a line width displayed on the display screen.

  The stroke information 103 includes a coordinate number 104 indicating the number of coordinates of a plurality of points constituting the stroke, and a plurality of coordinate data 105 indicating the coordinates of the plurality of points constituting the stroke. include.

  FIG. 28 is a diagram showing a data structure of skeleton data related to a Chinese character (character) such as “tree”. As shown in the figure, the skeleton data relating to “tree” includes four pieces of stroke information. In other words, the skeleton data related to “tree” includes data indicating the skeleton lines of four strokes. In the figure, the stroke skeleton lines corresponding to each stroke information are displayed as stroke # 1 to stroke # 4.

  For example, stroke # 1 is defined as a line segment connecting the start point (4, 192) and the end point (245, 192). For stroke # 3, a line segment connecting the start point (121, 192) and the point (97, 141), a line segment connecting the point (97, 141) and the point (72, 103), and a point ( 72, 103) and a point (41, 69) and a broken line consisting of a line connecting the point (41, 69) and the end point (0, 42). FIG. 29 is a diagram showing the skeleton data of FIG. 28 showing the skeleton of the Chinese character “tree” on the coordinate plane.

  In Patent Document 1, after the skeleton data 100 is read from the storage device, the coordinate data (coordinate values) 105 of the skeleton data are scaled according to the designated character size. By this scaling, the coordinate system set in advance for the coordinate data 105 of the skeleton data 100 is converted into an actual pixel coordinate system for the display screen.

  Thereafter, the character is drawn using the information indicating the skeleton line obtained by scaling. Specifically, characters to be displayed on the display screen are configured by giving each line segment that is an element of the skeleton line a predetermined line width.

  FIG. 30 is a diagram showing an example in which a predetermined line width is given to the line segment. Here, FIG. 30A is an example when the line width is an odd number, and FIG. 30B is an example when the line width is an even number. Then, by setting the gradation of the pixel surrounded by the thick line shown in the figure to a designated gradation (for example, a gradation (for example, black) different from the background gradation (for example, white)), the character Will be displayed on the display screen so as to be visible.

  However, in such a configuration, as shown in FIGS. 30 (a) and 30 (b), when displaying characters on the display screen, stepped jagged (jaggy) generated in a diagonal line becomes conspicuous.

  On the other hand, Japanese Patent Laid-Open No. 2004-228561 is synchronized with the operation of a generating unit that sequentially generates a plurality of pixel data in the sub-axis direction of a line segment, a register that holds a luminance reduction rate of each pixel, and the generating unit. In addition, a line segment antialiasing device is disclosed that includes output means for extracting necessary reduction rate data from the register and outputting each pixel data.

According to this apparatus, it is possible to suppress the occurrence of jaggedness called aliasing in line segment display.
Japanese Patent Laid-Open No. 2005-24987 JP-A-8-138067

  By the way, in Patent Document 2, the reduction rate for the decimal part of the distance between the theoretical line and the drawing pixel (d11 and d01 in the document (see FIGS. 4 and 5 of the document)) is held in a lookup table (LUT). The reduction rate data is obtained by directly referring to the LUT (see FIGS. 4 and 5 of the same document).

  For this reason, it is necessary to store (number of values that the decimal part can take) × (number of line width dots) in the LUT. For this reason, for example, in FIG. 5 of the same document, a storage capacity of 16 × 3 = 48 bytes is required.

  Further, in this document, since line images can be generated only for the line width corresponding to the LUT, a line image having an arbitrary line width cannot be output. If an attempt is made to output line images having many types of line widths, an enormous number of reduction rate data must be held in the LUT. For this reason, a large amount of storage capacity is also required in this case.

  Further, in this document, there is a possibility that the luminance values of all the pixels belonging to the line may be reduced. In this case, an operation for reducing the luminance values of all the pixels is necessary.

The present invention was considered Kan of the above problems, and an object without using data such as look-up table, a short processing time information processing apparatus capable to obscure Shaggy, the information To provide a processing method and a program.

  According to an aspect of the present invention, an information processing apparatus is an information processing apparatus for displaying a symbol on a display screen in which a plurality of pixels are arranged in a matrix, and stores information indicating a skeleton of the symbol The information indicating the skeleton includes information indicating an element line segment that is an element of each skeleton line constituting the skeleton, and based on the information indicating the skeleton, the specified gradation and the row direction of the matrix or When the symbol is displayed so as to have a line width specified in any of the column directions, the display control unit further determines a gradation of a display pixel of the plurality of pixels, and the display control unit includes the symbol When an element pixel group is a pixel group for a line width that is a part of a pixel group that constitutes the display pixel and the display pixels are arranged in a line in the direction of the line width, the element line segment and the element line segment Element pixel group including overlapping pixels Distance calculation means for calculating the distance in the direction of the line width with respect to the center point for each element pixel group, and the gradation of one end pixel included in the element pixel group including the center point according to the designated floor Gradation correction means for correcting the gradation to a gradation corresponding to the distance calculated by the distance calculation means, and a correction between the gradation correction means and the gradation of the background of the symbol to be displayed And display data generating means for generating display data for displaying symbols on the display screen.

Further, the pixel at one end is preferably a pixel located on the opposite side of the center point from the point on the element line segment that is away from the center point in the line width direction by a distance .

  In addition, the gradation correction unit is a pixel adjacent to the other end pixel in the element pixel group including the corrected pixel in the line width direction and not included in the element pixel group. Also, it is preferable to correct the gradation according to the distance calculated by the distance calculating means between the gradation of the symbol and the gradation of the background of the symbol.

  Further, the gradation correction means corrects the gradation of the symbol or the gradation of the background as the distance increases for the pixel at one end, and as the distance increases for the adjacent pixel. It is preferable to perform correction that approaches the gradation of the symbol from the gradation of the background.

Further, when a symbol is displayed based on a plurality of the element line segments, it is determined based on the information indicating the skeleton lines whether each element line segment is a straight line parallel to the row direction or the column direction. parallel decision means, and the pixel of the one end of the element group of pixels including a pixel overlapping with determine constant by element segment is parallel with the parallel determination Priority determination means, the other end of the element group of pixels It is preferable to provide correction limiting means for limiting correction by the gradation correction means for pixels that are adjacent to the pixel in the direction of the line width and are not included in the element pixel group.

In addition, when a symbol is displayed based on an element line segment parallel to the row direction or the column direction and another element line segment that is continuous with the parallel element line segment and has an inclination with respect to the element line segment, the symbol is displayed in parallel. A line passing through each center point in each element pixel group including pixels overlapping with a different element line segment is defined as a first virtual line, and a first point passing through the center point in the element pixel group including pixels overlapping with other element line segments is provided. when an imaginary line perpendicular to the line and the second imaginary line, when the position of the intersection between the second imaginary line and the other element line, the position of the first virtual line satisfies a predetermined relationship, overlapping with the intersection point Correction correction means for restricting gradation correction by the gradation correction means for one end pixel in the element pixel group including the pixel and the other end pixel adjacent to the element pixel group; preferable.

  On the display screen, if the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first imaginary line is parallel to the Y axis, and the other element line segments are the first imaginary lines. If the X axis is on the negative direction side, the predetermined relationship is preferably that the value of the X coordinate of the intersection is larger than the value of the X coordinate of the first virtual line.

  On the display screen, if the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first imaginary line is parallel to the Y axis, and the other element line segments are the first imaginary lines. If the X-axis is present on the positive direction side, the predetermined relationship is preferably that the X-coordinate value of the intersection is smaller than the X-coordinate value of the first imaginary line.

  On the display screen, if the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first virtual line is parallel to the X axis and the other element line segments are the first virtual line. When present on the negative direction side of the Y axis from the line, the predetermined relationship is preferably that the value of the Y coordinate of the intersection is larger than the value of the Y coordinate of the first virtual line.

  On the display screen, if the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first virtual line is parallel to the X axis and the other element line segments are the first virtual line. When present on the positive side of the Y axis from the line, the predetermined relationship is preferably that the value of the Y coordinate of the intersection is smaller than the value of the Y coordinate of the first virtual line.

  In addition, when a symbol is displayed based on an element line segment parallel to the row direction or the column direction and another element line segment that is continuous with the parallel element line segment and has an inclination with respect to the element line segment, the symbol is displayed in parallel. Assuming that a line passing through each center point in each element pixel group including a pixel that overlaps an element line segment is a first virtual line, the first virtual line overlaps the pixel overlapping the first element line segment, and the first When the virtual line and the second element line segment intersect, the length of the second element line segment is corrected so as to reach only a pixel adjacent to the pixel including the intersected point, and the first element line segment is corrected. It is preferable to include an element line segment correcting unit that corrects the length to a length that reaches the pixel including the intersecting point.

  Further, it is preferable that the color of the symbol is determined by additive color mixture, and the gradation correction unit corrects the gradation by correcting the pixel value for each of the primary colors of additive color mixture.

  According to another aspect of the present invention, an information processing device is an information processing device for displaying a symbol on a display screen in which a plurality of pixels are arranged in a matrix, and the symbol skeleton stored in the storage device When displaying a symbol on the display screen so as to have a specified gradation and a line width specified in either the row direction or the column direction of the matrix based on the information indicating Display control means for determining the gradation of the display pixel, the information indicating the skeleton includes information indicating the element line segment that is an element of each skeleton line constituting the skeleton, the display control means, as the element line segment, When displaying a symbol including a first element line segment parallel to the row direction or the column direction and a second element line segment that is continuous with the first element line segment and has an inclination with respect to the first element line segment To correct the specified gradation The tone correction means includes a tone correction means, and the gradation correction means is a part of a group of pixels constituting a symbol display pixel, and includes a line width including a pixel that overlaps an intersection of the first element line segment and the second element line segment. If the pixel group corresponding to the line width continuous in the direction is the element pixel group, the pixel adjacent to the end pixel in the element pixel group in the line width direction and not included in the element pixel group Thus, the gradation correction is not performed on the pixels in the region on the dominant angle side among the angles formed by the continuous element line segments.

  According to still another aspect of the present invention, an information processing device is an information processing device for displaying a symbol on a display screen in which a plurality of pixels are arranged in a matrix, wherein the symbol stored in the storage device is stored in the information processing device. Based on the information indicating the skeleton, when displaying the symbol on the display screen so as to have the specified gradation and the line width specified in either the row direction or the column direction of the matrix, Display control means for determining the gradation of the display pixels, the information indicating the skeleton includes information indicating element line segments that are elements of each skeleton line constituting the skeleton, and the display control means includes element line segments. A symbol including a first element line parallel to the row direction or the column direction and a second element line that is continuous with the first element line and has an inclination with respect to the first element line. The specified gradation is compensated. Gradation correction means, wherein the gradation correction means is a pixel arranged in the direction of the line width with respect to a pixel that overlaps the intersection of the first element line segment and the second element line segment, and both continuous element lines Of the angle formed by the minute, pixels in the region on the dominant angle side are not subjected to gradation correction to increase the line width.

  Further, the display control means is a part of a pixel group constituting the display pixel of the symbol, and when the pixel group corresponding to the line width in which the display pixels are arranged in a line in the line width direction is an element pixel group, A distance calculation unit that calculates the distance in the direction of the line width between the line segment and the center point of the element pixel group including the pixel overlapping the element line segment for each element pixel group, and the gradation correction unit includes: Regarding the pixel at one end of the element pixel group and the pixel at the other end adjacent to the element pixel group in the line width direction and not included in the element pixel group, It is preferable to correct the gradation according to the distance calculated by the distance calculating means between the designated gradation and the gradation of the background of the symbol to be displayed.

  According to still another aspect of the present invention, an information processing method is based on information indicating a skeleton of a symbol, on a display screen in which pixels are arranged in a matrix, with a specified gradation and a row direction or column of the matrix. An information processing method for displaying a symbol having a line width specified in one of directions, wherein the display pixel is a part of a pixel group constituting a display pixel of the symbol, and the display pixels are arranged in a line in the line width direction. If the pixel group corresponding to the line width arranged in the line is used as the element pixel group, the element line segment that is an element of the skeleton line constituting the skeleton, and the center point in the element pixel group including the display pixel that overlaps the element line segment, The distance calculation step for calculating the distance in the line width direction, the gradation of the pixel at one end included in the element pixel group including the center point, the gradation of the symbol and the gradation of the background of the symbol And the distance between And gradation correction step of correcting the gradation corresponding to the distance calculated in step, the symbol after correction by the gradation correction step, and a display step of displaying on the display screen.

  According to still another aspect of the present invention, the program is a program for causing a computer to execute the information processing method.

  According to the present invention. There is an effect that shaggy can be made inconspicuous in a short processing time without using data such as a lookup table.

  An embodiment of an information processing apparatus according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a block diagram showing a schematic configuration of the information processing apparatus 1. As illustrated in FIG. 1, the information processing apparatus 1 includes an input unit 10, an output unit 11, a storage device 12, a first memory 13, a second memory 14, and a control unit 15.

  The input unit 10 is an input device for receiving input from a user. When the user inputs data via the input unit 10, the input data is stored in the first memory 13. Examples of data input via the input unit 10 include data for specifying a symbol (for example, a character code), symbol size data, symbol line width type information (for example, thick, medium, Data for specifying the details), data for specifying the color of the symbols, and the like. In the following description, the default values for the type of the line width of the symbol and the color of the symbol are stored in advance in the storage device 12, and the user does not input a change instruction to the information processing device 1 via the input unit 10. As long as the display is based on the default value.

  The output unit 11 is a device for displaying data input via the input unit 10 and results of various processes in the control unit 15 based on instructions from the control unit 15. The output unit 11 includes a display screen in which pixels are arranged in a matrix. In the following, XY coordinates are set for the matrix, the positive direction of the X axis is the row direction of the matrix, and the negative direction of the Y axis is the column direction of the matrix. That is, the right direction is the X-axis direction and the upper direction is the Y-axis direction with respect to the display screen facing the user.

  In the following, it is assumed that the output unit 11 performs display using an RGB color model as an example of a color model. Hereinafter, the pixel value of the pixel is expressed as (R, G, B). Further, in the following, among the pixel values (R, G, B), the R element value is the R component value, the G element value is the G component value, and the B element value is the B component value. Called.

  The storage device 12 stores skeleton data of various symbols for each symbol. Further, the storage device 12 is constituted by, for example, a hard disk device or a flash memory. Here, the symbol is a concept including characters, figures, codes, and the like. Note that the configuration of the skeleton data is the same as the conventional configuration shown in FIGS. 27 and 28, and thus the description thereof is omitted here.

The first memory 13 is composed of a volatile semiconductor memory such as a RAM (Random Access Memory). The first memory 13 serves as a main storage device that directly exchanges data with a CPU (not shown) of the control unit 15. The first memory 13 temporarily stores data input by the user, data stored in the storage device 12, and the like.

  The second memory 14 is a VRAM (Video RAM), and is a memory for holding data to be displayed on the output unit 11. Note that the information processing apparatus 1 according to the present embodiment includes the first memory 13 and the second memory 14, but does not include the second memory 14 independently, and a partial area of the first memory 13 is provided. A configuration may be adopted in which the memory area is allocated as a VRAM memory area.

The control unit 15 controls various processes in the information processing apparatus 1.
The display control unit 16 in the control unit 15 includes a distance calculation unit 20, a gradation correction unit 21, and a display data generation unit 22. Furthermore, the gradation correction unit 21 includes a parallel determination unit 30, a correction restriction unit 31, and a line segment correction unit 32. Note that the control unit 15 and each unit in the control unit 15 are functional blocks, and processing in these blocks is realized by software executed by a CPU described later.

  The display control unit 16 causes the output unit 11 to display data processed in the control unit 15. Specifically, the display control unit 16 stores the image data in the second memory 14 functioning as a VRAM, and causes the output unit 11 to output the stored image data.

  More specifically, the display control unit 16 has a specified line width and specified gradation in either the row direction or the column direction of the matrix based on the skeleton data (information indicating the skeleton of the symbol). When displaying the symbol on the display screen, the gradation of the display pixel of the plurality of pixels is determined.

  Hereinafter, a line indicating a skeleton of a symbol configured based on coordinate data obtained by scaling coordinate data (see FIG. 28) of skeleton data is referred to as a skeleton line. That is, the skeleton line is described as a line indicating the skeleton of the symbol after being changed to the size when displayed on the output unit 11.

  A pixel group corresponding to a line width, which is a part of the pixel group constituting the display pixel of the symbol and in which the display pixels are arranged in a line in the line width direction, is referred to as an element pixel group. Furthermore, a line segment that is an element of each skeleton line constituting the skeleton of the symbol is referred to as an element line segment. That is, the element line segment is a line segment that is one element constituting the skeleton line and has a certain inclination.

  The distance calculation unit 20 calculates, for each element pixel group, the distance in the line width direction between the element line segment and the center point of the element pixel group including the pixel overlapping the element line segment.

  The gradation correction unit 21 specifies a correction target pixel for each element line segment, and corrects the specified gradation for the correction target pixel to another gradation according to a predetermined rule. Further, the gradation correction unit 21 corrects the pixel values of each color component (that is, the R component pixel value, the G component pixel value, and the B component pixel value). Here, tone correction means correcting the pixel value of each color component. The specification of the correction target pixel and a specific gradation correction method will be described later.

  The display data generation unit 22 generates display data for displaying symbols on the display screen based on the correction by the gradation correction unit 21, and temporarily stores the display data in the second memory.

  The parallel determination unit 30, the correction limiting unit 31, and the line segment correction unit 32 in the gradation correction unit 21 will be described later.

Here, with reference to FIG. 2, one aspect of a specific configuration of the information processing apparatus 1 according to the present embodiment will be described. The figure is a block diagram showing a hardware configuration of a computer system 100 0 which functions as the information processing apparatus 1.

Computer system 100 0 includes, as main components, a CPU 110 for executing a program, a mouse 120 and a keyboard 130 receives an input of an instruction by the user of the computer system 100 0, data generated by the execution of a program by CPU 110, or A RAM 140 that stores data input via the mouse 120 or the keyboard 130 in a volatile manner, a hard disk 150 that stores data in a nonvolatile manner, a compact disk-read only memory (CD-ROM) drive device 160, and a monitor 170. And a communication IF (Interface) 180. Each component is connected to each other by a data bus. A CD-ROM 161 is attached to the CD-ROM drive device 160.

  In the information processing apparatus 1, the input unit 10 corresponds to the keyboard 130 and the mouse 120, the output unit 11 corresponds to the monitor 170, the storage device 12 corresponds to the hard disk 150, the first memory 13, the second memory 14, Corresponds to the RAM 140.

Processing in the computer system 100 0 is realized by software executed by the hardware and CPU 110. Such software may be stored in the hard disk 150 in advance. The software may be stored in a CD-ROM 161 or other storage medium and distributed as a program product. Alternatively, the software may be provided as a program product that can be downloaded by an information provider connected to the so-called Internet. Such software is read from the storage medium by the CD-ROM driving device 160 or other reading device, or downloaded via the communication IF 180 and then temporarily stored in the hard disk 150. The software is read from the hard disk 150 by the CPU 110 and stored in the RAM 140 in the form of an executable program. CPU 110 executes the program.

Each component constituting computer system 100 0 shown in the same figure is a general one. Therefore, it can be said that the essential part of the present invention is software stored in the RAM 140, the hard disk 150, the CD-ROM 161, or other storage medium, or software that can be downloaded via a network. Since the operation of each hardware of computer system 100 0 are well known, detailed description will not be repeated.

  The recording medium is not limited to a CD-ROM, FD (Flexible Disk), and hard disk, but is a magnetic tape, a cassette tape, an optical disk (MO (Magnetic Optical Disc) / MD (Mini Disc) / DVD (Digital Versatile Disc)). IC (Integrated Circuit) card (including memory card), optical card, mask ROM, EPROM (Electronically Erasable Programmable Read-Only Memory), EEPROM (Electronically Erasable Programmable Read-Only Memory), fixing of flash ROM and other semiconductor memories Alternatively, it may be a medium carrying a program.

  The program here includes not only a program directly executable by the CPU but also a program in a source program format, a compressed program, an encrypted program, and the like.

  By the way, the above configuration is merely one aspect of a specific configuration, and may be a configuration in which the mouse is not provided and a keyboard, a monitor, and a hard disk are provided in the information processing apparatus 1. The information processing apparatus 1 can also be configured as a portable portable information terminal such as an electronic dictionary or a mobile phone.

  When the information processing apparatus 1 is configured as such a portable information terminal, for example, a flash memory can be used instead of the hard disk 150. Further, the input unit may include a touch pen type input device. Further, from the viewpoint of downsizing, it is preferable to use a thin monitor such as a liquid crystal monitor or an organic EL monitor as the monitor 170. From the viewpoint of miniaturization, it is preferable to provide a device for reading a memory card instead of the CD-ROM drive device and use the memory card as a recording medium instead of the CD-ROM.

  Here, the processing performed in the gradation correction unit 21 will be specifically described with reference to FIGS. In the following, a character will be described as an example of a symbol.

  First, based on the acquired character code, character size data, character line width type information, and character color data, the display control unit 16 determines the character and character size, the character line width type, and the character color. Is identified. Then, the display control unit 16 scales the skeleton data of the character based on the specified character size. In addition, the display control unit 16 considers the character size specified above and the type of the line width of the character, and determines the line width (specified line width) when displaying the character on the display screen of the output unit 11. decide. Further, the display control unit 16 displays the character on the display screen using the specified character color (pixel value). A method of using the character color will be described later.

  As a result, a case will be described first where the display control unit 16 determines that the line width of characters is displayed using an odd number of continuous pixels in a row when displayed on the display screen. Subsequently, a case will be described in which the display control unit 16 determines to display the line width of the character using an even number of pixels that are continuous in a line when displaying on the display screen.

  In the following, when the line width is expressed using an odd number of pixels continuous in a line, the line width is referred to as an odd line width. On the other hand, when a line width is expressed using an even number of pixels that are continuous in a line, the line width is referred to as an even line width. Note that the odd line width and the even line width refer to line widths before gradation correction described later. If tone correction is performed, the line width of a part of the character becomes thicker.

  Here, the line width will be described. The line width refers to the width of characters in the X-axis direction or Y-axis direction. Further, when expressing the width of a character, pixels (pixel group) continuous in a line are used. For example, when the line width is 3, three consecutive pixels are used.

  More specifically, when expressing the width of a character, a pixel group (element pixel group) that includes pixels in which element line segments of skeleton lines overlap and is continuous in a line in the X-axis direction or the Y-axis direction is used. The control unit 15 determines which pixel group to use from the pixel group that is continuous in a line in the X-axis direction and the pixel group that is continuous in a line in the Y-axis direction based on the inclination of the element line segment.

  For example, when the absolute value of the slope of the element line segment is 1 or more, the width of the character is expressed using a pixel group that is continuous in a line in the X-axis direction. On the other hand, when the absolute value of the slope of the element line segment is less than 1, the width of the character is expressed using a pixel group that is continuous in a line in the Y-axis direction.

  FIG. 3 is a diagram showing a part of the character after correcting the odd-line width character by the gradation correcting unit 21. This figure is also a diagram showing a part of the character in the line width direction.

  In the figure, first, since the absolute value of the inclination of the element line segment L1 is 1 or more, the control unit 15 sets the line width in the X-axis direction.

  In the conventional configuration in which correction by the gradation correction unit 21 is not performed, three consecutive pixels such as a pixel Pa, a pixel Pb, and a pixel Pc corresponding to an odd line width (the line width is 3 in the figure) are characters. Is a pixel group constituting the. The pixel Pb is the central pixel of the pixel group because the distance in the X-axis direction between the center point C of the pixel Pb and the element line segment L1 is the X axis between the center point of another pixel and the element line segment L1. This is because it is smaller than the distance in the direction.

  Also in the present embodiment, the pixel Pa, the pixel Pb, and the pixel Pc are used as a pixel group constituting a character.

  The distance calculation unit 20 calculates the distance in the X-axis direction between the center point C of the pixel Pb and the element line segment L1. That is, the distance calculation unit 20 calculates the distance | d | between the center point C and the point G on the element line segment L1. Furthermore, in other words, the distance calculation unit 20 calculates the distance between the center point and the point G in the pixel group composed of the pixel Pa, the pixel Pb, and the pixel Pc. Here, in calculating the distance | d |, the distance between the center points of the pixels is 1. That is, | d | takes a value from 0 to 0.5. Note that the point G is also a point on a line passing through each center point in each pixel arranged in a line in the line width direction of the character.

  The gradation correction unit 21 identifies the pixel Pa on the opposite side of the point G with respect to the center point C as the correction target pixel. The gradation correction unit 21 also identifies the pixel Pd adjacent to the pixel Pc in the X-axis direction as the correction target pixel. In the following, the pixel value of the character in the character region before correction (for example, pixel Pa, pixel Pb, pixel Pc) is (R, G, B) = (Rf, Gf, Bf), and the background region before correction The background pixel value in (for example, pixel Pd) will be described as (R, G, B) = (Rb, Gb, Bb).

  The gradation correction unit 21 performs gradation correction on the pixel Pa using the following equations (1) to (3), and the corrected pixel value (R, G, B) = (Rm, Gm, Bm). Then, the gradation correction unit 21 uses the pixel value of the pixel Pa as a corrected pixel value, and corrects the gradation of the pixel Pa.

Rm = (1− | d |) × Rf + | d | × Rb (1)
Gm = (1− | d |) × Gf + | d | × Gb (2)
Bm = (1− | d |) × Bf + | d | × Bb (3)
Further, the gradation correction unit 21 performs gradation correction on the pixel Pd using the following formulas (4) to (6), and the corrected pixel value (R, G, B) = ( Rm, Gm, Bm). Then, the gradation correction unit 21 uses the pixel value of the pixel Pd as the corrected pixel value, and corrects the gradation of the pixel Pd.

Rm = | d | × Rf + (1− | d |) × Rb (4)
Gm = | d | × Gf + (1− | d |) × Gb (5)
Bm = | d | × Bf + (1− | d |) × Bb (6)
As described above, the pixel Pa and the pixel Pd are gradations between the gradation of the character and the gradation of the character background, and are corrected to the gradation according to the distance calculated by the distance calculation unit 20.

  For the pixel Pa, the gradation correction unit 21 corrects the gradation from the character gradation to the background gradation as the value of the distance | d | increases. On the other hand, for the pixel Pd, the gradation correction unit 21 performs correction that approaches the gradation of the character from the gradation of the background as the distance | d | increases.

  Further, when the value of the R component of the corrected pixel Pa and the value of the R component of the corrected pixel Pd are added, Rf + Rb is obtained. That is, the value is the same as the sum of the R component value of the pixel that is not the correction target pixel (pixel Pb or pixel Pc) and the R component value of the background pixel. The same applies to the value of the G component and the value of the B component.

  As described above, the line width is corrected from 3 to 4, and a part of the character is constituted by the pixel Pa, the pixel Pb, the pixel Pc, and the pixel Pd as shown in FIG.

  FIG. 4 is a diagram illustrating a part of the character after correcting the odd-line width character by the gradation correction unit 21 as in FIG. 3. 4 differs from FIG. 3 in that the point G of the element line segment L1 exists on the negative direction side of the X axis with respect to the center point C of the pixel Pb serving as the center pixel.

  For this reason, in FIG. 4, the gradation correction unit 21 specifies the pixel Pc as the correction target pixel and specifies the pixel Pe adjacent to the pixel Pa in the X-axis direction as the correction target pixel. In this case, the pixel Pc is corrected based on the above formulas (1) to (3). On the other hand, for the pixel Pe, correction based on the above formulas (4) to (6) is performed.

  FIG. 5 is a diagram showing a part of the character after the even-line width character is corrected by the gradation correction unit 21. This figure is also a diagram showing a part of the character in the line width direction.

  In the figure, first, since the absolute value of the inclination of the element line segment L1 is 1 or more, the line width is set in the X-axis direction by the control unit 15 as in FIGS.

  In the conventional configuration in which correction by the gradation correction unit 21 is not performed, two pixels that are continuous in one row, such as a pixel Pf and a pixel Pg, for even line width (the line width is 2 in the figure) form a character. It becomes a pixel group. Here, the pixel Ph does not become a pixel constituting the character, but the pixel Pf becomes a pixel constituting the character because the distance in the X-axis direction between the center point of the pixel Pf and the element line segment L1 is the pixel Ph. This is because it is smaller than the distance in the X-axis direction between the center point and the element line segment L1.

Also in this embodiment, the pixel Pf and the pixel Pg are used as a pixel group constituting a character.
The distance calculation unit 20 calculates the distance in the X-axis direction between the center point C of the pixel group composed of the pixel Pf and the pixel Pg and the element line segment L1. That is, the distance calculation unit 20 calculates the distance | d | between the center point C and the point G on the element line segment L1. In other words, the distance calculation unit 20 calculates the distance in the X-axis direction between the center point of the boundary line segment between the pixel Pf and the pixel Pg and the element line segment L1. Again, in calculating the distance | d |, the distance between the center points of the pixels is 1. That is, | d | takes a value from 0 to 0.5.

  The gradation correction unit 21 performs gradation correction on the pixel Pf using the above formulas (1) to (3), and the corrected pixel value (R, G, B) = (Rm, Gm, Bm). Then, the gradation correction unit 21 uses the pixel value of the pixel Pf as the corrected pixel value, and corrects the gradation of the pixel Pf.

  Further, the gradation correction unit 21 performs gradation correction on the pixel Ph using the above formulas (4) to (6), and the corrected pixel value (R, G, B) = ( Rm, Gm, Bm). Then, the gradation correction unit 21 uses the pixel value of the pixel Ph as a corrected pixel value, and corrects the gradation of the pixel Ph.

  As described above, the pixel Pf and the pixel Ph are gradations between the gradation of the character and the gradation of the character background, and are corrected to the gradation corresponding to the distance calculated by the distance calculation unit 20.

  Further, for the pixel Pf, the gradation correction unit 21 corrects the character gradation to approach the background gradation as the value of the distance | d | increases. On the other hand, for the pixel Ph, as the distance | d | increases, the gradation correction unit 21 corrects the gradation closer to the character gradation from the background gradation.

  Further, when the value of the R component of the corrected pixel Pf and the value of the R component of the corrected pixel Ph are added, Rf + Rb is obtained. That is, the value is the same as the sum of the R component value of the pixel that is not the correction target pixel (pixel Pg) and the R component value of the background pixel. The same applies to the value of the G component and the value of the B component.

  As described above, the line width is corrected from 2 to 3, and a part of the character is constituted by the pixel Pf, the pixel Pg, and the pixel Ph as shown in FIG.

  FIG. 6 is a diagram illustrating a part of the character after the even-line width character is corrected by the gradation correction unit 21 as in FIG. 5. 6 differs from FIG. 5 in that the point G of the element line segment L1 is closer to the negative side of the X axis (left side in FIG. 6) than the center point C of the pixel group composed of the pixels Pf and Pg. It is a point that exists.

  For this reason, in FIG. 6, the gradation correction unit 21 specifies the pixel Pg as the correction target pixel and specifies the pixel Pi adjacent to the pixel Pf in the X-axis direction as the correction target pixel. In this case, the pixel Pg is corrected based on the above formulas (1) to (3). On the other hand, the correction based on the above formulas (4) to (6) is performed on the pixel Pi.

  In addition, since the point G is a point to be processed for the calculation of the distance | d |, the point G is hereinafter referred to as a processing target point G.

  FIG. 7 is a flowchart showing the flow of processing in the information processing apparatus 1. In particular, this figure shows a case where one character is displayed on the display screen.

  First, the display control unit 16 acquires character information such as a character code, character size data, character line width type information, and character color for a character to be displayed (S1). The character to be displayed may be a character input via the input unit 10 or a character stored in the information processing apparatus 1 in advance. In step S1, the character, character size, character line width type, and character color are specified.

After step S1, the display control unit 16 reads the skeleton data specified by the character code described above from the storage unit 1 2 (S2). Note that the read skeleton data is temporarily stored in the first memory 13. After step S2, the display control unit 1
6 scales the read skeleton data based on the specified character size (S3).

  After step S3, the display control unit 16 acquires stroke information related to the skeleton line of one stroke from the scaled skeleton data (S4). The stroke information is the same as the stroke information shown in Patent Document 1. In the example of the Chinese character “Thu”, there are four pieces of stroke information for the Chinese character.

  After step S4, the display control unit 16 draws a stroke having a predetermined line width (specified line width) based on the acquired single stroke information and the line width type information of the specified character. (S5). After step S5, the display control unit 16 determines whether or not the above drawing has been performed for all strokes included in the character (S6). Here, the predetermined line width refers to the line width of the character after the correction by the gradation correction unit 21.

  If it is not determined in S6 that the drawing has been performed for all strokes, the process returns to step S4 again. On the other hand, if it is determined that the drawing has been performed for all strokes in S6, a series of processing for the character is terminated.

  FIG. 8 is a flowchart showing details of the process in step S5 of FIG. In FIG. 8, the absolute value of the slope of the element line segment is 1 or more, and for each element line segment, the Y coordinate of the start point of the element line segment is greater than the Y coordinate of the end point of the element line segment. In the following description, the case of a small value is taken as an example.

  Also, in the following, when calculating the distance in the X-axis direction between the element line segment and the above-described center point C, the processing target point G on the element line segment is obtained first, and then the processing target point G and the center A configuration for calculating the distance to the point C will be described.

  First, the distance calculation unit 20 acquires coordinate values of two points at both ends (start point and end point) of one element line segment based on the stroke information (S11). After step S11, the distance calculation unit 20 calculates the slope k of the element line segment based on the acquired coordinate value (S12). Here, a line in the line width direction (X-axis direction in FIGS. 3 to 6) and passing through the center of each pixel is referred to as a virtual line L2.

After step S12, the distance calculation unit 20 obtains an intersection between the element line segment and the virtual line L2 in the vicinity of both ends of the element line segment based on the start point coordinates and the end point coordinates of the element line segment ( S13). At this time, in the pixel where the end portions of the element line segment overlap, when the element line segment is short and does not intersect with the virtual line L2 passing through the center of the pixel, the extension line of the element line segment and the virtual line L2 The point where the points intersect is defined as the above point of intersection. In the following, the intersection on the start point side is referred to as point S, and the intersection on the end point side is referred to as point E.

  After step S13, the distance calculation unit 20 sets the processing target point G described above as the point S (S14). After step S14, the distance calculation unit 20 determines whether or not the determined line width is an odd number (S15).

  If it is determined in step S15 that the number is an odd number, the distance calculation unit 20 obtains the pixel center point C closest to the processing target point G (S16). After step S16, the distance calculation unit 20 calculates the distance | d | between the processing target point G and the obtained center point C (S17). Specifically, the distance calculation unit 20 sets the absolute value of the difference between the X coordinate value of the processing target point G and the X coordinate value of the center point C as the distance | d |.

After step S <b> 17, the gradation correction unit 21 described above is based on the pixel group of the line width in the X-axis direction centered on the pixel having the center point C (that is, the line width before correction). The gradation is corrected according to the distance | d | (S18). By performing the above correction based on this pixel group, as shown in FIGS. 3 and 4, the pixel at one end of the pixel group (for example, pixel Pa in FIG. 3) and the pixel group The gradation is corrected for a pixel (for example, the pixel Pd in FIG. 3) adjacent to the other end pixel. Then, after the step S18, the process proceeds to step S 19.

If it is determined in step S15 that it is not an odd number, the distance calculation unit 20 specifies a boundary line segment between pixels closest to the processing target point G (S20). After step S 20, the distance calculation unit 20, a target point G, the distance between the specified boundary line | d | is calculated (S21). That is, the distance calculation unit 20 calculates the distance between the processing target point G and the center point (that is, the center point C) of the identified distance line segment. Specifically, the distance calculation unit 20 sets the absolute value of the difference between the X coordinate value of the processing target point G and the X coordinate value of the boundary line segment as the distance | d |.

After step S21, the gradation correction unit 21 performs gradation corresponding to the distance | d | based on the pixel group corresponding to the line width in the X-axis direction with the center point C as the center of the pixel group. Is corrected (S22). By performing the above correction based on this pixel group, as shown in FIGS. 5 and 6, the pixel at one end of the pixel group (for example, the pixel Pf in FIG. 5) and the pixel group Grayscale correction is performed on a pixel (for example, pixel Ph in FIG. 5) adjacent to the other end pixel. Then, after the step S22, the process proceeds to step S 19.

In step S19 , the value k is added to the X coordinate value of the processing target point G, and 1 is added to the Y coordinate value. After step S19, the control unit 15 determines whether or not the coordinate value of the processing target point G matches the coordinate value of the point E (S23).

  If it is determined in step S20 that they do not match, the process returns to step S15 again. On the other hand, if it is determined in step S20 that they match, the display control unit 16 has performed processing based on steps S12 to S23 described above for all element lines included in the skeleton line of the stroke. It is determined whether or not (S24).

  If it is determined in step S24 that all line segment elements have not been processed, the process returns to step S11 again. On the other hand, if it is determined in step S24 that processing has been performed for all line segment elements, the process returns to step S6 in FIG.

  FIG. 9 is a diagram for explaining the effect of the gradation correction. FIG. 9A shows a character (part) when the gradation correction is not performed, and FIG. 9B shows a character (part) when the gradation correction is performed. FIG.

  When the above gradation correction is not performed, shaggy is conspicuous as shown in FIG. However, it can be seen that by performing the above-described gradation correction, as shown in FIG. 9B, the contour is smooth without any noticeable shaggy.

  As described above, according to the information processing apparatus 1, in order to perform gradation correction according to the distance | d |, it is necessary to store data used for gradation correction such as a lookup table in the storage device during the correction. Absent. Further, since the gradation of the pixel is calculated according to only the distance | d |, the time required for gradation correction can be shortened as compared with the configuration in which the data in the lookup table is accessed for each pixel.

  By the way, there are the following two methods for generating the display data generation unit 22 in the data storage area of the second memory 14 functioning as a VRAM, with the gradation corrected as described above.

  The first method is to directly draw character data in the second memory 14. In other words, this is a method of correcting gradation using data already stored in the second memory 14 (that is, video data being displayed) as character background data (hereinafter referred to as a direct drawing method). .

  In the second method, a character color contribution degree to be described later is stored in a memory other than the second memory 14 (hereinafter referred to as a temporary memory) and stored in the second memory 14 using the character color contribution degree. This is a method for updating the data (video data being displayed) (hereinafter referred to as an indirect drawing method).

  Hereinafter, the direct drawing method will be described first, and then the indirect drawing method will be described.

  FIG. 10 is a flowchart showing a flow of processing when the direct drawing method is performed. Specifically, it is a flowchart showing the processing in step S18 and step S22 in the flow of FIG.

  Here, for convenience of explanation, the concept of character color contribution is used. The character color contribution level is defined as a character color before gradation correction by the gradation correction unit 21 (specifically, the value of each color component) is 100, and the character before gradation correction is related to the character after gradation correction. This is a value indicating how much the color of the color contributes.

  Specifically, for the pixel Pa in FIG. 3, the character color contribution is 100 × (1− | d |). In addition, for the pixel Pb and the pixel Pc in the figure, the tone color correction is not performed, so the character color contribution is 100. Further, for the pixel Pd in the figure, the character color contribution is 100 × | d |. In the region other than the pixels Pa to Pd in FIG.

  First, the display control unit 16 specifies an update target pixel in the second memory 14 and obtains a character color contribution degree corresponding to the pixel (S31). After step S31, the display control unit 16 determines whether or not the character color contribution is 100 (S32).

  If it is determined in step S32 that the degree of contribution is 100, the gradation correction unit 21 updates the pixel value of the update target pixel with the pixel value (Rf, Gf, Bf) (S33). That is, the update target pixel is updated with the character color itself.

  On the other hand, if it is not determined in step S32 that the degree of contribution is 100, the gradation correction unit 21 acquires the pixel values (Rb, Gb, Bb) of the update target pixel (S34). After step S34, the gradation correction unit 21 uses the pixel values (Rf, Gf, Bf), the pixel values (Rb, Gb, Bb), and the calculated character color contribution to correct the corrected pixels. A value is calculated (S35). The calculation of the corrected pixel value is omitted here because the above-described equations (1) to (3) and equations (4) to (6) are used. In equations (1) to (6), calculation is performed using a value obtained by dividing the character color contribution by 100 (that is, 1− | d | or | d |).

  After step S35, the gradation correction unit 21 updates the pixel value of the update target pixel with the corrected pixel value (S36). Thereby, the gradation of the pixel Pa and the pixel Pd in FIG. 3 is corrected.

FIG. 11 is a flowchart showing a part of the flow of processing when performing the indirect drawing method.
First, the display control unit 16 specifies one update target pixel in the temporary memory and obtains a character color contribution K1 corresponding to the pixel (S41). After step S41, the display control unit 16 determines whether the character color contribution degree of the update target pixel is already stored in the temporary memory (S42).

  If it is determined in step S42 that the character color contribution is already stored, the control unit 15 determines that the character color contribution K1 obtained in step S41 is greater than the character color contribution K2 that has already been stored. It is determined whether it is larger (S43). On the other hand, if it is not determined in S42 that the character color contribution has already been stored, the process proceeds to step S44.

  If it is not determined in step S43 that the value is large, the process proceeds to step S45. On the other hand, if it is determined in step S43 that the value is large, the process proceeds to step S44. In step S44, the character color contribution degree of the update target pixel is set to K1. After step S44, the process proceeds to step S45.

  In step S45, the display control unit 16 determines whether or not processing has been performed for all the update target pixels included in one character. If it is determined in step S45 that the processing has not been performed for all the update target pixels, the process returns to S41 again.

  On the other hand, if it is determined in step S45 that all the update target pixels have been processed, the pixel value of each pixel is calculated using the character color contribution stored in the temporary memory, and the calculated pixel value Is used to update the pixel value in the second memory 14 (S46). By this update processing, gradation correction is performed. The calculation of the pixel value is omitted here because the above-described equations (1) to (3) and equations (4) to (6) are used.

  Since the indirect drawing method is configured to update the pixel values in the second memory 14 after obtaining the character color contributions of all the update target pixels, it is different from the flow of FIG. 7 in which drawing is performed for each stroke. It will be.

  Further, by using the direct drawing method, a temporary memory as used in the indirect drawing method becomes unnecessary. In addition, since the transfer from the temporary memory to the second memory 14 is not necessary, the processing speed can be increased.

  On the other hand, by using the indirect drawing method, the gradation of the character color is prevented from becoming higher than the gradation of other portions even at a location where the element line segments intersect or where the element line segments are crowded. be able to.

  By the way, in the above, whether the element line segment is parallel to the X axis or the Y axis, the gradation correction unit 21 performs the above-described gradation correction. However, the symbol (part of the symbol) drawn by the element line segment parallel to the X axis and the element line segment parallel to the Y axis does not generate stepped jaggedness (jaggy) in the first place. For this reason, it is preferable to perform the above-described gradation correction only for element line segments that are inclined with respect to the X axis and the Y axis (that is, diagonal line segments).

  Therefore, a configuration using the parallel determination unit 30 and the correction limiting unit 31 will be described below.

  The parallel determination unit 30 determines whether each element line segment is a straight line parallel to the X axis or the Y axis based on the scaled skeleton data (information indicating the skeleton line).

Correction limiting unit 31, with respect to the parallel-format constant unit 30 and determine the constant by element segment overlaps group element pixels including a pixel which is parallel with, limiting the correction so that the correction of the gradation as described above is not performed.

  FIG. 12 is a diagram illustrating a part of symbols obtained when the correction is limited using the parallel determination unit 30 and the correction limiting unit 31. In the figure, the dotted line is a line connecting the center points of the pixels.

  As shown in the figure, the element line segment L3 is an oblique line segment, and the element line segment L4 is a line segment parallel to the Y axis. In the case of displaying a part of the character based on the element line segment L3, as shown in FIG. The line width is increased from 3 to 4 by the correction. On the other hand, when a part of the symbol is displayed based on the element line segment L4, the correction of the gradation is restricted by the correction restriction unit 31, as shown in FIG.

  As a result, the shaggy can be made inconspicuous with respect to the oblique character portion, and the character blurring can be avoided with respect to the character portion parallel to the Y axis. Further, since the calculation of gradation correction based on the distance | d | is unnecessary for the element line segment parallel to the X axis or the Y axis, the calculation of gradation correction is executed for the parallel element line segment. Compared to the configuration, the time required for display can be shortened.

Thus, the correction limiting unit 31, the one end portion of the pixel (FIG. 12 in inclusive element pixel group pixels overlapping with determine constant by element segment is parallel with the parallel determination Priority determination unit 30, for example, the pixel Pj) and pixels that are adjacent to the other end of the element pixel group and are not included in the element pixel group (for example, pixel Pk in the figure) are processed by the gradation correction unit 21. It can be said that it is the structure which restrict | limits correction | amendment.

  Incidentally, when the gradation is corrected by the correction limiting unit 31 as described above, the following problems occur.

  FIG. 13 is a diagram showing a part of a character drawn using an oblique element line segment L5 and an element line segment L6 continuous to the element line segment L5. In the figure, the correction restriction described above by the correction restriction unit 31 is performed.

  In this case, as shown in the figure, gradation correction is also performed for the pixel Pm and the pixel Pn. Therefore, in the region on the dominant angle side (the side where the angle is 180 degrees or more) of the angles formed by the element line segment L5 and the element line segment L6, a convex portion with respect to the outline of the symbol parallel to the Y axis Will be formed. For this reason, the appearance of a character worsens.

  Therefore, hereinafter, a configuration will be described in which a part of the function of the correction restriction unit 31 is changed to prevent the appearance of characters from being deteriorated.

  FIG. 14 is a diagram showing a part of a character obtained by changing the function of the correction limiting unit 31 in this way. When a part of a character is drawn using the element line segment L5 and the element line segment L6, as shown in the figure, at least the pixel Pm and the pixel Pn are not subjected to gradation correction.

  Below, the process for displaying such a good-looking character is demonstrated based on FIGS. 15-18.

  FIG. 15 is a diagram showing each element line segment used when drawing a certain stroke. In the figure, three element line segments (L10, L11, and L12) are shown. Also, in the figure, the start point of the element line segment L10 is H, the end point of the element line segment L10, the start point of the element line segment L11 is I, the end point of the element line segment L11 and the end point of the element line segment L12 is Let J and the end point of the element line segment L12 be K.

  In the scaled coordinate data, the coordinate value of the point H, the coordinate value of the point I, the coordinate value of the point J, and the coordinate value of the point K are arranged in this order. Furthermore, it is assumed that a stroke based on the element line segment L10 is drawn first, then a stroke based on the element line segment L11 is drawn, and finally a stroke based on the element line segment L12 is drawn.

  Further, when drawing a stroke based on the element line segment L11, the element line segment L10 is referred to as an element line segment immediately before the drawing target, and the element line segment L12 is referred to as an element line segment immediately after the drawing target. Further, in the figure, a point on the element line segment L11 used for the drawing and the point to be processed first among the processing target points G described above is a point S, and finally the processing is performed. The point to be performed is indicated as point E. Furthermore, the inclination of the element line segment L11 is set to 1 or more.

Below, the specific content of a process is demonstrated under such a definition.
FIG. 16 is a flowchart showing details of processing in stroke drawing (step S5 in FIG. 7).

  First, the display control unit 16 acquires the coordinate values of the element line segment L10 (that is, the coordinate values of the points H and I in FIG. 15) from the scaled skeleton data (S51). After step S51, the distance calculation unit 20 calculates the slope of the element line segment L10 (S52). After step S52, the distance calculation unit 20 calculates the coordinate value between the point S and the point E (S53). Further, after step S53, the distance calculation unit 20 sets the processing target point G to the point S (S54).

  After step S54, the display control unit 16 sets the upper limit value Xmax and the lower limit value Xmin in the X-axis direction (S55). Here, the reason why the upper limit value and the lower limit value in the X-axis direction are set is that the slope of the element line segment L10 is 1 or more and a line width is formed in the X-axis direction. When the slope of the element line segment is 1 or less, an upper limit value and a lower limit value are set in the Y-axis direction. After step S55, the distance calculation unit 20 determines whether or not the line width is an odd number (S56). Here, the line width is a line width before gradation correction.

  If it is determined in step S56 that the number is an odd number, the distance calculation unit 20 obtains the X coordinate value of the center point (that is, the center point C) of the pixel closest to the processing point G (S57). In the following, the coordinate value of the processing point G is represented as (Xg, Yg), and the coordinate value of the center point C is represented as (Xc, Yc). In this case, Yg and Yc are the same value. That is, the coordinate value of the center point C can also be expressed as (Xc, Yg).

  After step S57, the distance calculation unit 20 determines whether Xg is greater than or equal to Xmin and less than or equal to Xmax (S58). If it is determined in step S58 that it is greater than or equal to Xmin and less than or equal to Xmax, the distance calculation unit 20 calculates a distance | d | between the processing target point G and the center point C (S59). After step S39, the gradation correction unit 21 draws a part of the stroke (see FIG. 3) as described above using the distance | d | calculated by the distance calculation unit 20 (S60). After step S60, the distance calculation unit 20 adds k to the X coordinate value of the processing target point G and adds 1 to the Y coordinate value of the processing target point G (S61).

  On the other hand, if it is not determined in step S58 that the distance is not less than Xmin and not more than Xmax, the distance calculation unit 20 sets the point (Xc, Yg) to a pixel group (elements) composed of pixels continuous in the line width direction. The display control unit 16 draws a part of the stroke without performing gradation correction as in the past (S62). That is, the pixel Pn and the pixel Pm shown in FIG. 14 can be kept in the background color without being subjected to gradation correction. Therefore, it is possible to obtain characters that look good. After step S62, the process proceeds to step S61.

  By the way, when it is not determined in step S56 that the number is an odd number, the distance calculation unit 20 obtains the coordinate value of the center point (that is, the center point C) of the boundary line segment that is closest to the processing target point G. (S63).

  After step S63, the distance calculation unit 20 determines whether Xg is greater than or equal to Xmin and less than or equal to Xmax (S64). If it is determined in step S64 that it is greater than or equal to Xmin and less than or equal to Xmax, the distance calculation unit 20 calculates the distance | d | between the processing target point G and the center point C (S65). After step S59, the gradation correction unit 21 draws a part of the stroke (see FIG. 5) using the distance | d | calculated by the distance calculation unit 20 as described above (S66). After step S66, the process proceeds to step S61.

  On the other hand, if it is not determined in step S64 that it is not less than Xmin and not more than Xmax, the process proceeds to step S62.

  After step S61, the distance calculation unit 20 determines whether the coordinate value of the processing target point G is the same as the coordinate value of the point E (S67). If it is not determined in step S67 that they are the same, the process returns to step S56 again. On the other hand, if it is determined in step S67 that they are the same, the display control unit 16 determines whether or not processing has been performed for all element line segments (L10, L11, and L12) included in the one stroke. (S68).

  If it is not determined in step S68 that all element line segments have been processed, the process returns to step S51 again. On the other hand, if it is determined in step S68 that all the element line segments have been processed, the process ends.

  FIG. 17 is a flowchart showing a method for setting the upper limit value and the lower limit value in step S55 of FIG. For convenience of explanation, the setting of the upper limit value and the lower limit value for the element line segment L11 will be described as an example.

  First, the display control unit 16 determines whether or not the immediately preceding element line segment L10 is a line segment (horizontal line or vertical line) parallel to the X-axis or Y-axis based on the coordinate values of the points H and I. Judgment is made (S71). If it is determined in step S71 that the line segments are parallel, the display control unit 16 determines whether or not the line width is an odd number (S72). Here, the line width is a line width before gradation correction.

  If it is determined in step S72 that the number is odd, the display control unit 16 sets the lower limit value Xmin to the X coordinate value of the coordinates of the center point of the pixel including the point S (S73). Thereafter, the process proceeds to step S76. On the other hand, if it is not determined in step S72 that the number is an odd number, the display control unit 16 sets the lower limit value Xmin to the X coordinate value of the boundary line segment closest to the point S (S74). Thereafter, the process proceeds to step S56.

  If it is not determined in step S51 that the line segments are parallel, the display control unit 16 sets the lower limit value Xmin to a minimum value among the possible values of Xg (S75). Thereafter, the process proceeds to step S76.

  In step S76, the display control unit 16 determines whether or not the immediately following element line segment L12 is a line segment parallel to the X axis or the Y axis based on the coordinate values of the point J and the point K. When it is determined in step S76 that the line segments are parallel, the display control unit 16 determines whether or not the line width is an odd number (S77). Here, the line width is a line width before gradation correction.

  If it is determined in step S77 that the number is odd, the display control unit 16 sets the upper limit value Xmax to the X coordinate value of the coordinates of the center point of the pixel including the point E (S78). Thereafter, the process ends. On the other hand, if it is not determined in step S77 that the number is an odd number, the display control unit 16 sets the upper limit value Xmax to the X coordinate value of the boundary line segment closest to the point E (S79). Thereafter, the process ends.

  If it is not determined in step S77 that the line segments are parallel, the display control unit 16 sets the upper limit value Xmax to the maximum value among the possible values of Xg (S80). Thereafter, the process ends.

FIG. 18 is a diagram illustrating an example of setting an upper limit value and an example of setting a lower limit value.
18A is a diagram showing the upper limit value Xmax for the X coordinate as shown in the flow of FIG. 17, and FIG. 18B is the X coordinate as shown in the flow of FIG. It is the figure which showed the lower limit Xmin about. FIG. 18C is a diagram showing the upper limit value Ymax for the Y coordinate, and FIG. 18B is a diagram showing the lower limit value Ymin for the Y coordinate.

  Here, a line passing through each center point in each element pixel group including a pixel that overlaps an element line segment parallel to the X axis or the Y axis (for example, a vertical line or a horizontal line in FIG. 18) is represented by a virtual line L15 (first virtual line). Line). That is, the virtual line L15 is a line segment parallel to the X axis if the element line segment is parallel to the X axis, and a line segment parallel to the Y axis if the element line segment is parallel to the Y axis. In addition, the thick dotted line of FIG. 13 and FIG. 14 corresponds to the virtual line L15.

  In addition, a center point in the element pixel group including a pixel that overlaps with another element line segment (for example, a hatched line segment in FIG. 18) that is continuous with the parallel element line segment and has an inclination with respect to the element line segment. A line that passes through and is perpendicular to the first virtual line is defined as a virtual line L16 (second virtual line). That is, the imaginary line L16 is a line in the line width direction (X-axis direction in FIGS. 3 to 6) and the line passing through the center of each pixel, like the imaginary line L2. In FIG. 14, the virtual line L16 is a line parallel to the X-axis direction.

With this define virtual line L15 and the virtual line L16, the correction limiting unit 31, when the imaginary line L16 and the intersections with the other elements segments, the position of the virtual line L15 satisfies a predetermined relationship The pixel at one end in the element pixel group including the pixel overlapping the intersection and the pixel adjacent to the pixel at the other end in the element pixel group in the line width direction and the element pixel group It can be said that the pixel that is not included in is limited to the gradation correction performed by the gradation correction unit 21.

  By the way, in FIGS. 14 to 18, in order to display a good-looking character, the correction restriction unit 31 restricts the gradation correction for a predetermined pixel (for example, the pixel Pm and the pixel Pn in FIG. 14). Below, the structure which uses the line segment correction | amendment part 32 in order to display the character with good appearance similarly is demonstrated.

  The line segment correction unit 32 changes the length of the element line segment without changing the inclination of the element line segment with respect to the predetermined element line segment. Specifically, the line segment correction unit 32 is configured to change the length of the element line segment by changing the coordinate value of the start point and the coordinate value of the end point of each element line segment.

  FIG. 19 is a diagram showing element line segments (L20 · L21) before correction by the line segment correction unit 32 and element line segments (L20 ′ / L21 ′) after correction. FIG. 19A shows element lines before correction, and FIG. 19B shows element lines after correction.

  As shown in FIG. 19A, the element line segment L20 and the element line segment L21 are continuous line segments. The element line segment L21 is a line segment parallel to the Y axis. The element line segment L20 has a predetermined inclination with respect to the element line segment L21. Further, in the figure, the element line segment L20 has an inclination of 1 or more with respect to the X axis.

  In addition, as shown in the figure, the start point of the element line segment L20 is a point T, the end point of the element line segment L20, the start point of the element line segment L21 is a point U, and the end point of the element line segment L21 is a point V. .

Hereinafter, a specific method of correcting the element line segment L20 to the element line segment L20 ′ shown in FIG. 19B and correcting the element line segment L21 to the element line segment L21 ′ shown in FIG. 19 will be described. To do. First, correction of the element line segment L20 will be described.

  FIG. 20 is a diagram illustrating an element line segment L20 before correction and an element line segment L20 ′ after correction. FIG. 20A shows the element line segment L20 before correction, and FIG. 20B shows the element line segment L20 ′ after correction.

  Here, as shown in FIGS. 20 (a) and 20 (b), a line passing through each center point in each element pixel group including pixels overlapping with the element line segment L21 parallel to the Y axis is represented by an imaginary line L30 (the first line). 1 virtual line). An intersection point between the virtual line L30 and the element line segment L20 is defined as an intersection point Q.

  The line segment correction unit 32 corrects the length of the element line segment L20 so as to reach only the pixel adjacent to the pixel including the intersection point Q. For example, in the example shown in FIG. 20B, the X coordinate value of the end point of the element line segment L20 is set to a value obtained by subtracting the slope of the element line segment (here, k) from the X coordinate value of the intersection point Q. Then, by correcting the Y coordinate value of the end point to a value obtained by subtracting 1 from the Y coordinate value of the intersection point Q, the length of the element line segment L20 is reduced to a pixel adjacent to the pixel including the intersection point Q. It is corrected to a length that can only be reached.

Next, correction of the element line segment L21 will be described.
FIG. 21 is a diagram showing an element line segment L21 before correction and an element line segment L21 ′ after correction. FIG. 21A shows the element line segment L21 before correction, and FIG. 21B shows the element line segment L21 ′ after correction.

  The line segment correction unit 32 corrects the length of the element line segment L21 so as to reach the pixel including the intersection point Q. For example, in the example shown in FIG. 21B, the length of the element line segment L21 is reduced to the pixel including the intersection point Q by performing correction that decreases the Y coordinate value of the start point of the element line segment L21 by one. It is corrected to reach the length. That is, the starting point of the element line segment L21 ′ after correcting the element line segment L21 is the point U ′.

  FIG. 22 is a flowchart showing the flow of processing when correcting the lengths of the element line segments shown in FIGS. This figure is also a flowchart showing details of processing in stroke drawing (step S5 in FIG. 7).

  First, the distance calculation unit 20 acquires the coordinate values of the start point and the end point of each element line segment (in FIG. 19, the coordinate values of the point T, the point U, and the point V) from the scaled skeleton data (S91). ). After step S91, the line segment correction unit 32 corrects the coordinate values of the start point and / or end point (S92). Details of step S92 will be described later.

  Further, after step S92, the line segment correction unit 32 generates an element line segment using the corrected coordinate values, and based on the element line segment, the gradation corresponding to the above-described distance | d | Correction is performed (S93). Note that step S93 is the same as the processing from step S12 to step S23 in FIG. 8, and thus description thereof is omitted here.

  After step S93, the display control unit 16 determines whether or not the processing based on the above-described steps S92 and S93 has been performed on all element line segments included in the skeleton line of the stroke (S94). ).

  If it is determined in step S94 that all line segment elements have not been processed, the process returns to step S91 again. On the other hand, if it is determined in step S94 that all line segment elements have been processed, the process ends and the process returns to step S6 in FIG.

Next, details of step S92 in FIG. 22 will be described.
FIG. 23 is a flowchart showing a process flow in step S92.

  First, the line segment correction unit 32 determines whether or not an element line segment is a diagonal line (that is, a line not parallel to the X axis or the Y axis) from the coordinate values of the start point and end point of the element line segment ( S101).

  If it is determined in step S101 that it is a diagonal line, the start point and / or end point of the diagonal line segment is corrected (S102). Then, after step S102, the process ends.

  On the other hand, if it is not determined in step S101 that the line is a diagonal line, the start point and / or end point of the element line segment that is not the diagonal line is corrected (S103). Then, after step S103, the process ends.

Next, details of the processing in step S102 of FIG. 23 will be described.
FIG. 24 is a flowchart showing the flow of processing in step S102. That is, FIG. 24 is also a flowchart showing the flow of correction processing for the element line segment L20.

  First, the display control unit 16 determines whether the immediately preceding element line segment is a line segment parallel to the X axis or the Y axis based on the coordinate values of the start point and the end point of the immediately preceding element line segment. (S111). Note that the display control unit 16 determines that it is not a parallel line segment when there is no immediately preceding element line segment (for example, in the case of the element line segment L20).

  When it is determined in step S111 that the line segments are parallel, the display control unit 16 determines whether or not the line width is an odd number (S112). Here, the line width is a line width before gradation correction. On the other hand, if it is not determined in step S111 that the line segments are parallel, the process proceeds to step S117.

  If it is determined in step S112 that the number is an odd number, the display control unit 16 sets the lower limit value Xmin in the X-axis direction to the X coordinate value of the coordinates of the center point of the pixel including the start point (S113). Thereafter, the process proceeds to step S115. On the other hand, if it is not determined in step S112 that the number is an odd number, the display control unit 16 sets the lower limit value Xmin to the X coordinate value of the boundary line segment closest to the start point (S114). Thereafter, the process proceeds to step S115.

  In step S115, the line segment correction unit 32 determines whether or not the X coordinate value of the starting point is smaller than the lower limit value Xmin.

  If it is determined in step S115 that the line segment correction unit 32 is small, the line segment correction unit 32 sets the coordinate value of the intersection point Q between the straight line satisfying X = Xmin (that is, the virtual line L30) and the element line segment to be processed. While obtaining (Xq, Yq), the starting point is changed to (Xq + k, Yq + 1) (S116). After step S116, the process proceeds to step S117.

  On the other hand, if it is not determined that the value is small in step S115, the process proceeds to step S117.

  In step S117, it is determined based on the coordinate values of the start point and end point of the immediately following element line segment whether the immediately following element line segment is a line segment parallel to the X axis or the Y axis. In addition, the display control part 16 judges that it is not a parallel line segment, when there is no element line segment immediately after.

  If it is determined in step S117 that the line segments are parallel, the display control unit 16 determines whether or not the line width is an odd number (S118). Here, the line width is a line width before gradation correction. On the other hand, if it is not determined in step S117 that the line segments are parallel, the process ends.

  If it is determined in step S118 that the number is an odd number, the display control unit 16 sets the upper limit value Xmax to the X coordinate value of the coordinates of the center point of the pixel including the end point (S119). Thereafter, the process proceeds to step S121. On the other hand, if it is not determined in step S118 that the number is an odd number, the display control unit 16 sets the upper limit value Xmax to the X coordinate value of the boundary line segment closest to the end point (S120). Thereafter, the process proceeds to step S121.

  In step S121, the line segment correction unit 32 determines whether or not the X coordinate value of the end point is greater than the upper limit value Xmax.

  If it is determined in step S121 that the line segment correction unit 32 is large, the line segment correction unit 32 sets the coordinate value of the intersection point Q between the straight line satisfying X = Xmax (that is, the virtual line L30) and the element line segment to be processed. While obtaining (Xq, Yq), the end point is changed to (Xq-k, Yq-1) (S122). After step S122, the process ends.

  For example, for the element line segment L20, the end point is corrected in step S122.

Next, details of the processing in step S103 of FIG. 23 will be described.
FIG. 25 is a flowchart showing the flow of processing in step S103. That is, FIG. 25 is also a flowchart showing a correction process flow for the element line segment L21.

  First, the display control unit 16 determines whether or not the immediately preceding element line segment is a diagonal line (that is, a line segment that is not parallel to the X axis or the Y axis), and the coordinates between the start point and the end point of the immediately preceding element line segment. A determination is made based on the value (S131). The display control unit 16 determines that there is no diagonal line when there is no immediately preceding element line segment.

  If it is determined in step S131 that the line is shaded, the display control unit 16 determines whether the line width is an odd number (S132). Here, the line width is a line width before gradation correction. On the other hand, if it is not determined in step S131 that the line segments are parallel, the process proceeds to step S137.

  If it is determined in step S132 that the number is an odd number, the display control unit 16 sets the upper limit value Xmax in the X-axis direction to the X coordinate value of the coordinates of the center point of the pixel including the start point (S133). Thereafter, the process proceeds to step S135. On the other hand, if it is not determined in step S132 that the number is an odd number, the display control unit 16 sets the upper limit value Xmax to the X coordinate value of the boundary line segment closest to the start point (S134). Thereafter, the process proceeds to step S135.

  In step S135, the line segment correction unit 32 determines whether or not the X coordinate value of the starting point is larger than the upper limit value Xmax.

  If it is determined in step S135 that the value is large, the line segment correction unit 32 sets the coordinate value (Xq, Yq) of the intersection point Q between the straight line satisfying X = Xmax (that is, the virtual line L30) and the immediately preceding element line segment. ) And the Y coordinate value of the starting point is changed to Yq (S136). After step S136, the process proceeds to step S137.

  On the other hand, if it is not determined that the value is large in step S135, the process proceeds to step S137.

  In step S137, the display control unit 16 determines whether or not the immediately following element line segment is a diagonal line based on the coordinate values of the start point and end point of the immediately following element line segment. In addition, the display control part 16 judges that it is not a diagonal line, when there is no element line segment immediately after (for example, in the case of element line segment L21).

  If it is determined in step S137 that the line is shaded, the display control unit 16 determines whether the line width is an odd number (S138). Here, the line width is a line width before gradation correction. On the other hand, if it is not determined in step S137 that the line is shaded, the process ends.

  When it is determined in step S138 that the number is an odd number, the display control unit 16 sets the lower limit value Xmin to the X coordinate value of the coordinates of the center point of the pixel including the end point (S139). Thereafter, the process proceeds to step S141. On the other hand, when it is not determined in step S138 that the number is an odd number, the display control unit 16 sets the lower limit value Xmin to the X coordinate value of the boundary line segment closest to the end point (S140). Thereafter, the process proceeds to step S141.

  In step S141, the line segment correction unit 32 determines whether or not the X coordinate value of the end point is smaller than the lower limit value Xmin.

  When it is determined in step S141 that the line segment correction unit 32 is small, the line segment correction unit 32 coordinates values (Xq, Yq) of the intersection point Q between the straight line satisfying X = Xmin (that is, the virtual line L30) and the immediately following element line segment. ) And the Y coordinate value of the end point is changed to Yq (S142). After step S142, the process ends.

  For example, for the element line segment L21, the start point is corrected in step S136.

  FIG. 26 is a diagram showing characters displayed when the line segment correction unit 32 corrects the start point and / or end point of the element line segment as described above. FIG. 26A shows the letter M, and FIG. 26B shows the letter W. In FIGS. 26A and 26B, a white line (line segment) is a line formed by collecting a plurality of element line segments.

  For example, in FIG. 26A, the coordinate values of the parallel element line segments in the area extending from the center line of the element line segment parallel to the Y axis (corresponding to the virtual line L30) to the left side of the drawing in the white circle. The coordinate values with the diagonal element line segments that continue to the line segment are corrected.

  In FIG. 26B, in the white circle, the coordinate values of the parallel element line segments in the region protruding from the center line (corresponding to the virtual line L30) of the element line segment parallel to the Y axis to the right side of the drawing. The coordinate values with the diagonal element line segments that continue to the line segment are corrected.

  As shown in FIGS. 26A and 26B, it is possible to display characters with good appearance by the correction using the line segment correction unit 32.

  In the case where the element line segment is corrected by the line segment correcting unit 32, the start point and the end point of the element line segment are corrected in advance. Therefore, since it is not necessary to determine whether the upper limit value or the lower limit value is exceeded as described above, it is possible to reduce the time required for display compared to the processing method described with reference to FIGS. .

  By the way, in the above, as shown in FIG. 3, for example, a configuration in which gradation correction is performed also for the pixel Pd adjacent to the element pixel group (a pixel group including the pixel Pa, the pixel Pb, and the pixel Pc) is given as an example. explained. However, the present invention is not limited to this, and the pixel Pd may be configured not to correct gradation. In this case, instead of correcting the gradation of the pixel Pa, the gradation of the pixel Pc may be corrected.

  In the above description, the configuration using the RGB color model has been described as an example. However, the configuration is not limited thereto. Any color model using additive color mixing may be used.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is the block diagram which showed schematic structure of information processing apparatus. It is a block diagram showing the hardware constitutions of the computer system which functions as an information processing apparatus. It is the figure which showed a part of character after correcting the character of odd line width. It is another figure which showed a part of character after correcting the character of odd line width. It is the figure which showed a part of character after correcting the character of even line width. It is the other figure which showed a part of character after correcting the character of even line width. It is the flowchart which showed the flow of the process in information processing apparatus. It is the flowchart which showed the detail of the process of step S5 of FIG. It is a figure for demonstrating the effect of a gradation correction | amendment, (a) is a figure which showed the character (one part) when the said gradation correction is not performed, (b) was the gradation correction performed It is the figure which showed the character (part) in the case. It is the flowchart which showed the flow of the process at the time of performing a direct drawing method. It is the flowchart which showed a part of flow of the process at the time of performing an indirect drawing method. It is the figure which showed a part of symbol obtained when the restriction | limiting of correction | amendment was performed. It is the figure which showed a part of character drawn using the diagonal element line segment and the element line segment which continues to the said element line segment. It is the figure which showed a part of character obtained by changing the function of a correction | amendment restriction | limiting part. It is the figure which showed each element line segment used when drawing one stroke. It is the flowchart which showed the detail of the process in FIG.7 S5. It is the flowchart which showed the setting method of the upper limit and lower limit in step S55 of FIG. It is the figure which showed the example of a setting of an upper limit, and the example of a setting of a lower limit. It is the figure which showed the element line segment before correction | amendment by the line segment correction | amendment part, and the element line segment after correction | amendment, (a) is the figure which showed the element line segment before correction | amendment, (b) It is the figure which showed the element line segment after correction | amendment. It is the figure which showed the element line segment before correction | amendment, and the element line segment after correction | amendment, Comprising: (a) is the figure which showed the element line segment before correction | amendment, (b) is the element line after correction | amendment. It is the figure which showed minute L20 '. It is the figure which showed the element line segment before correction | amendment, and the element line segment after correction | amendment, Comprising: (a) is the figure which showed the element line segment before correction | amendment, (b) is the element line after correction | amendment. It is the figure which showed minutes. It is the flowchart which showed the flow of the process at the time of correct | amending the length of the element line segment shown in FIG. 20 and FIG. It is the flowchart which showed the flow of the process in step S92 of FIG. It is the flowchart which showed the flow of the process in step S102 of FIG. It is the flowchart which showed the flow of the process in FIG.23 S103. FIG. 7 is a diagram showing characters displayed when the start point and / or end point of an element line segment is corrected by the line segment correction unit, (a) is a diagram showing a letter M, (b) Is a diagram showing a letter W. FIG. It is the figure which showed the data structure of skeleton data. It is the figure which showed the data structure of the skeleton data regarding kanji, such as "tree". It is the figure which showed the skeleton data of FIG. 28 on the coordinate plane. It is the figure which showed the example which gave predetermined | prescribed line width with respect to a line segment, (a) is the figure which showed the example at the time of making line width odd, (b) is an even line width FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Information processing apparatus, 12 Storage devices, 13 1st memory, 14 2nd memory, 15 Control part, 16 Display control part, 20 Distance calculation part, 21 Gradation correction part, 22 Display data generation part, 30 Parallel determination part, 31 correction restriction unit, 32 line segment correction unit.

Claims (16)

An information processing apparatus for displaying symbols on a display screen in which a plurality of pixels are arranged in a matrix,
Storage means for storing information indicating the skeleton of the symbol, the information indicating the skeleton includes information indicating an element line segment that is an element of each skeleton line constituting the skeleton;
Based on the information indicating the skeleton, when displaying the symbol so as to have a specified gradation and a line width specified in either a row direction or a column direction of the matrix, Display control means for determining the gradation of the display pixels of
The display control means includes
The element line segment is a part of a pixel group constituting the display pixel of the symbol, and the element pixel group is a pixel group corresponding to a line width in which the display pixels are arranged in a line in the line width direction. And a distance calculation means for calculating a distance in the direction of the line width between the element pixel group including a pixel overlapping with the element line segment in the direction of the line width,
The gradation of one end pixel included in the element pixel group including the center point is a gradation between the designated gradation and the gradation of the background of the symbol to be displayed. Gradation correction means for correcting the gradation according to the distance calculated by the distance calculation means;
Based on said correction in the gradation correction section, viewed contains a display data generating means for said symbols to generate display data for displaying on said display screen,
The pixel at the one end is a pixel located on the opposite side to the point on the element line segment that is away from the center point by the distance in the line width direction from the center point. Processing equipment. The gradation correcting means is a pixel adjacent to the other end pixel in the element pixel group including the pixel subjected to the correction in the direction of the line width, and not included in the element pixel group. even with the, a gradation between the gradation of the background of the gradation and the symbols of the symbol, you corrected gradation corresponding to the distance calculated by the distance calculating unit, according to claim 1 Information processing device. The gradation correction means includes
For the pixel at the one end, as the distance increases, a correction is made so that the gradation of the symbol approaches the gradation of the background,
The information processing apparatus according to claim 2, wherein the adjacent pixels are corrected so as to approach the gradation of the symbol from the gradation of the background as the distance increases . If the symbol based on a plurality of the elements line is displayed, each element line segment, whether the row direction or a said column direction and a straight line parallel to the information showing the skeleton line parallel decision means you determined based,
The pixel at the one end in the element pixel group including pixels overlapping the element line segment determined to be parallel by the parallel determination means, the pixel at the other end in the element pixel group, and the line for a picture element that is not included in the element group of pixels with a pixel adjacent in the direction of width, Ru and a correction limiting means for limiting the correction by the gradation correction means, according to claim 2 or 3 Information processing device. Parallel elements segments in the row direction or the column direction, said symbol based on the other elements line having an inclination relative to the monitor that element segment and for continuous with the parallel element segment appears that case, a line passing through the center point in the containing pixel overlapping with parallel elements line elements pixel group and the first imaginary line, said element pixel group including a pixel overlapping the other element segment When a line perpendicular to the first imaginary line passing through the center point at is a second imaginary line,
When the position of the intersection of the second imaginary line and the other element line segment and the position of the first imaginary line satisfy a predetermined relationship, the one in the element pixel group including pixels overlapping the intersection comprising of a pixel edge, the correction limiting means for limiting the correction of the gradation by the gradation correcting means for a pixel of the other end portion adjacent to the element group of pixels, wherein Koko 2 or 3 Information processing device. In the display screen, when the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction , the first virtual line is parallel to the Y axis and the other element line segment is the first direction. 1 when present in the negative side in the X-axis than the imaginary line, the predetermined relationship, der Ru larger than the value of X-coordinate values of X-coordinate of the intersection point of the first virtual line, wherein Item 6. The information processing device according to Item 5 . In the display screen, when the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first virtual line is parallel to the Y axis and the other element line segment is the first direction. 1 when present in the positive direction side of the X-axis than the imaginary line, the predetermined relationship is smaller Ikoto than the value of X-coordinate values of X-coordinate of the intersection point of the first virtual line, claim 5. The information processing apparatus according to 5 . In the display screen, when the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first imaginary line is parallel to the X axis, and the other element line segments are the when than the first virtual line exists in the negative side in the Y-axis, said predetermined relationship is a magnitude Ikoto than the value of the Y coordinate of the intersection of the Y-coordinate values of the first virtual line, wherein Item 6. The information processing device according to Item 5 . In the display screen, when the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction, the first imaginary line is parallel to the X axis, and the other element line segments are the when than the first virtual line exists in the positive direction side of the Y-axis, the predetermined relationship is smaller Ikoto than the value of the Y-coordinate value of the Y coordinate of the intersection point of the first virtual line, wherein Item 6. The information processing device according to Item 5 . Parallel elements segments in the row direction or the column direction, said symbol based on the other elements line having an inclination relative to the monitor that element segment and for continuous with the parallel element segment appears that case, when a line passing through the center point in the containing pixel overlapping with parallel elements line elements pixels is defined as a first virtual line,
When the first imaginary line overlaps a pixel that overlaps the first element line segment, and the first imaginary line and the second element line segment intersect, the length of the second element line segment is An element line correction that corrects the length to reach only the pixel adjacent to the pixel including the intersecting point and corrects the length of the first element line segment to the length reaching the pixel including the intersecting point. Ru comprising means, information processing apparatus according to claim 2 or 3. The symbol is a color determined by additive color mixture,
It said gradation correction means performs more correction of the gradation correcting the pixel value for each of the primary colors of the additive color, the information processing apparatus according to any one of claims 1 to 3. An information processing apparatus for displaying symbols on a display screen in which a plurality of pixels are arranged in a matrix ,
Based on the information indicating the framework of the symbols stored in the storage device, the said display screen so as to have a specified line width in any row or column direction of the designated gradation and before Symbol Matrix A display control means for determining a gradation of a display pixel of the plurality of pixels when displaying a symbol, and the information indicating the skeleton is an element line segment that is an element of each skeleton line constituting the skeleton; Including information indicating
The display control means includes
As the element line segment, a first element line segment parallel to the row direction or the column direction, and a second element line segment that is continuous with the first element line segment and has an inclination with respect to the first element line segment. preparative when displaying including said symbol comprises a gradation correction means for correcting the specified gradation,
The gradation correction means includes the line width including a pixel that is a part of a group of pixels constituting the display pixel of the symbol and overlaps an intersection of the first element line segment and the second element line segment. If the pixel group corresponding to the line width continuous in the direction is the element pixel group, it is a pixel adjacent to the end pixel in the element pixel group in the line width direction and included in the element pixel group. An information processing apparatus that does not perform the gradation correction for pixels in a region on the dominant angle side among the angles formed by the two continuous element line segments . An information processing apparatus for displaying symbols on a display screen in which a plurality of pixels are arranged in a matrix,
Based on the information indicating the skeleton of the symbol stored in the storage device, the symbol is displayed on the display screen so as to have a specified gradation and a specified line width in either the row direction or the column direction of the matrix. Display control means for determining a gradation of a display pixel among the plurality of pixels, and the information indicating the skeleton includes element line segments that are elements of the skeleton lines constituting the skeleton. Including information to indicate,
The display control means includes
As the element line segment, a first element line segment parallel to the row direction or the column direction, and a second element line segment that is continuous with the first element line segment and has an inclination with respect to the first element line segment. A gradation correcting means for correcting the designated gradation when displaying the symbol including:
Said gradation correction means is a pixels arranged in the direction of the line width to about the pixel which overlaps with the intersection between the second element segment and the first element line, both elements line the continuous An information processing apparatus that does not perform gradation correction such that the line width is increased for pixels in a region on the dominant angle side among angles formed by minutes . The display control means includes
The element line segment is a part of a pixel group constituting the display pixel of the symbol, and the element pixel group is a pixel group corresponding to a line width in which the display pixels are arranged in a line in the line width direction. and the direction of length of the line width between the center of the element line partial overlaps said element pixel group containing the pixel, the distance calculating means for calculating for each said main Motoga pixel group further comprises,
Said gradation correction means includes a pixel at one end of said element pixel groups, the element pixel with a pixel adjacent in the direction of the pixel and the line width of the other end you adjacent to the element group of pixels tone for a pixel not included in the group, a gradation between the gradation of the background of the symbols displayed as the designated gradations, according to the distance calculated by said distance calculation means The information processing apparatus according to claim 12 or 13, wherein the information processing apparatus corrects to Based on the information indicating the skeleton of the symbol, a symbol having a specified gradation and a specified line width in either the row direction or the column direction of the matrix is displayed on a display screen in which pixels are arranged in a matrix. An information processing method for causing
A part of a pixel group constituting a display pixel of the symbol, wherein the display pixel is the line
When the group of pixels lined line width of in a row in the direction of the width component pixel group, including the element segment is an element of skeletal lines constituting the framework, a display pixel which overlaps with the element segment a distance calculation step of calculating the center point definitive in the element group of pixels, the distance in the direction of the line width,
The gradation of one end pixel included in the element pixel group including the center point is a gradation between the gradation of the symbol and the background gradation of the symbol, and the distance calculation and gradation correction step of correcting the gradation corresponding to distance calculated in step,
A display step of displaying the symbol after the correction in the gradation correction step on the display screen ,
The pixel at the one end is a pixel located on the opposite side to the point on the element line segment that is away from the center point by the distance in the line width direction from the center point. Processing method . A program for causing a computer to execute the information processing method according to claim 15 .