WO2009107554A1

WO2009107554A1 - Information processing device, information processing method, and program

Info

Publication number: WO2009107554A1
Application number: PCT/JP2009/053019
Authority: WO
Inventors: 瑞作田; 安久中村; 佳世岡本
Original assignee: シャープ株式会社
Priority date: 2008-02-28
Filing date: 2009-02-20
Publication date: 2009-09-03
Also published as: JP2009204989A; JP4361118B2; CN101960512A

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

INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND PROGRAM

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

BACKGROUND Conventionally, a stroke font, which is a type of scalable font, is known. The scroll font is one of the data formats for representing the shape of characters on a computer. In addition, the scroll font is also a form that expresses the shape of a character as a parameter (vector data) of a center line (skeleton line).

For example, Japanese Patent Application Laid-Open No. 2005-24987 (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 (i.e., a stroke font) indicating a skeleton of the character called skeleton data.

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 types of characters, 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 fraction of the number of strokes of characters. In other words, a stroke is also part of a character having a line width displayed on the display screen.

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

FIG. 28 is a diagram showing a data structure of skeleton data regarding a kanji (character) such as "tree". As shown in the figure, skeleton data on "tree" includes four pieces of stroke information. In other words, skeleton data on "trees" includes data indicating skeleton lines of four strokes. In the figure, the skeletal lines of the strokes corresponding to each piece of stroke information are displayed as strokes # 1 to # 4.

For example, the stroke # 1 is defined as a line connecting the start point (4, 192) and the end point (245, 192). Stroke # 3 is a line connecting the start point (121, 192) and the point (97, 141), a line connecting the point (97, 141) and the point (72, 103), and a point (72). , 103) and the point (41, 69), and 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 kanji character "tree" on a coordinate plane.

In Patent Document 1, after the character display device reads the skeleton data 100 from the storage device, the character display device scales the coordinate data (coordinate value) 105 of the skeleton data according to the designated character size. By this scaling, the character display device converts the coordinate system previously set for the coordinate data 105 of the skeleton data 100 into the actual pixel coordinate system for the display screen.

Thereafter, the character display device draws a character using the information indicating the skeletal line obtained by scaling. Specifically, a character to be displayed on the display screen is configured by causing the character display device to have a predetermined line width for each line segment which is an element of the skeletal line.

FIG. 30 is a diagram showing an example in which a predetermined line width is given to the line segment. Here, FIG. 30 (a) is an example where the line width is odd, and FIG. 30 (b) is an example where the line width is even. Then, the character display device sets 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 gradation of the background (for example, white)) As a result, the character display device displays characters in a visible manner on the display screen.

However, in such a configuration, as shown in FIGS. 30 (a) and 30 (b), when displaying characters on the display screen, the step-like jaggedness (jaggies) generated in the diagonal lines becomes noticeable.

On the other hand, in JP-A-8-138067 (Patent Document 2), a generation means for sequentially generating a plurality of pixel data in the sub-axis direction of a line segment, a register for holding the luminance reduction rate of each pixel and A line segment anti-aliasing apparatus is disclosed which comprises: output means for taking out necessary reduction rate data from the register in synchronization with the operation of the generation means and outputting each pixel data.

According to this device, it is possible to suppress the occurrence of jaggedness called aliasing in line segment display.
JP 2005-24987 A JP-A-8-138067

By the way, the line segment anti-aliasing device of patent document 2 looks up the reduction rate with respect to the decimal part of the distance between the theoretical line and the drawing pixel (d11 and d01 in the same document (see FIG. 4 and FIG. 5 in the same document)). The line segment anti-aliasing apparatus is configured to acquire reduction rate data by directly referring to the LUT (see FIGS. 4 and 5 of the same document).

For this reason, the line segment anti-aliasing apparatus needs to store (the number of possible values of the decimal part) × (the number of line width dots) reduction rate data in the LUT. Therefore, for example, in FIG. 5 of the same document, a storage capacity of 16 × 3 = 48 bytes is required.

Further, since the line segment anti-aliasing device of the same document can generate a line image only for the line width corresponding to the LUT, it can not output a line image of an arbitrary line width. If it were to be possible to output line images of many types of line widths, the line segment anti-aliasing apparatus would have to hold a huge number of reduction rate data in the LUT. Therefore, also in this case, a large storage capacity is required.

Furthermore, in the document, since there is a possibility that the luminance values of all the pixels belonging to the line are reduced, in this case, an operation for reducing the luminance values of all the pixels is required.

The present invention has been made in view of the above problems, and an object thereof is an information processing apparatus capable of making a shaggy inconspicuous in a short processing time without using data such as a look-up table, an information processing apparatus A method and a program are provided.

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 on which a plurality of pixels are arranged in a matrix, and storing information indicating a skeleton of the symbol. The information indicating the skeleton includes information indicating an element line segment which is an element of each skeleton line constituting the skeleton, and based on the information indicating the skeleton, the designated gradation and the row direction of the matrix or The display control unit further includes a display control unit that determines a gradation of a display pixel among the plurality of pixels when the symbol is displayed so as to have a line width specified in any of the column directions. When a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is set as an element pixel group, an element line segment and the element line segment are included. Center of element pixel group including overlapping pixels And a distance calculation unit that calculates the distance in the direction of the line width with respect to each element pixel group, the gradation of the pixel at one end included in the element pixel group including the center point, and the designated gradation Based on the correction by the gradation correction unit, which is a gradation between the gradation of the background of the displayed symbol and the gradation of the background of the displayed symbol, the gradation correction unit corrects the gradation according to the distance calculated by the distance calculation unit. And a display data generation unit for generating display data for displaying the symbol on the display screen.

In addition, the pixel at one end is a pixel located on the opposite side to the point on the element line segment which is separated from the central point by the distance in the direction of the line width from the central point. Is preferred.

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

Further, the gradation correction unit corrects the gradation of the symbol or the gradation of the background as the distance increases for the pixels at one end, and the distance increases for the adjacent pixels. It is preferable to make correction that approaches the tone of the symbol from the background tone.

In addition, when a symbol is displayed based on a plurality of the element line segments, it is determined whether each element line segment is a straight line parallel to the row direction or the column direction based on the information indicating the skeleton line A parallel determination unit, a pixel at one end of the element pixel group including pixels overlapping the element line segment determined to be parallel by the parallel determination unit, and a pixel at the other end of the element pixel group It is preferable that the pixel which is adjacent to the line width direction and which is not included in the element pixel group includes a correction limiting unit which limits the correction by the gradation correction unit.

In addition, when the symbol is displayed based on an element line parallel to the row direction or column direction and another element line continuous with the parallel element line and having an inclination with respect to the element line, A line passing through each center point in each element pixel group including pixels overlapping the first element line as a first virtual line, and a center point in an element pixel group including pixels overlapping the other element line segment; Assuming that a line perpendicular to the virtual line is a second virtual line, if the position of the intersection of the second virtual line and the other element segment and the position of the first virtual line satisfy a predetermined relationship, they overlap the intersection A correction limiting unit is provided which limits the correction of gradation by the gradation correction unit with respect to the pixel at one end of the element pixel group including the pixels and the pixel at the other end adjacent to the element pixel group. preferable.

In the display screen, assuming that 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 virtual line. Preferably, the predetermined relationship is that the value of the X coordinate of the point of intersection is greater than the value of the X coordinate of the first virtual line, when it exists more on the negative direction side of the X axis.

In the display screen, assuming that 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 virtual line. Preferably, the predetermined relationship is that the value of the X coordinate of the point of intersection is smaller than the value of the X coordinate of the first virtual line, when it exists more on the positive direction side of the X axis.

In the display screen, assuming that 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 segment is the first virtual In the case of being on the negative direction side of the Y axis with respect to 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.

In the display screen, assuming that 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 segment is the first virtual In the case of being on the positive direction side of the Y axis with respect to 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 the symbol is displayed based on an element line parallel to the row direction or column direction and another element line continuous with the parallel element line and having an inclination with respect to the element line, Assuming that a line passing through each central point in each element pixel group including pixels overlapping the first element line is a first virtual line, the first imaginary line overlaps the pixel overlapping the first element line, and When the virtual line intersects with the second element line segment, the length of the second element line segment is corrected to a length reaching only the pixel adjacent to the pixel including the intersection point, and the first element line segment It is preferable to include an element line segment correction unit that corrects the length of the image to a length that reaches the pixel including the intersection point.

Further, the symbol is such that the color is determined by the additive color mixture, and the tone correction unit preferably performs the tone correction by correcting the pixel value for each of the additive color primaries.

According to another aspect of the present invention, an information processing apparatus is an information processing apparatus for displaying a symbol on a display screen on which a plurality of pixels are arranged in a matrix, and the skeleton of the symbol stored in the storage device When a symbol is displayed on the display screen so as to have the designated gradation and the designated line width in either the row direction or the column direction of the matrix based on the information indicating The display control unit is configured to determine the gradation of the display pixel, the information indicating the skeleton includes information indicating an element line segment that is an element of each skeleton line that constitutes the skeleton, and the display control unit 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 continuous with the first element line segment and having an inclination with respect to the first element line segment To correct the specified gradation A correction unit, the gradation correction unit is a part of a group of pixels constituting a display pixel of a symbol, and has a line width including a pixel overlapping with an intersection of the first element line segment and the second element line segment; Assuming that a pixel group corresponding to a line width continuous in the direction is an element pixel group, the pixel is a pixel adjacent to the end pixel in the element pixel group in the line width direction and not included in the element pixel group The gradation correction is not performed on the pixels in the region on the dominant side of the angles formed by the two continuous element line segments.

According to still another 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 the information processing device is a symbol stored in the storage device. When displaying a symbol on the display screen so as to have the designated gradation and the designated line width in either the row direction or the column direction of the matrix based on the information indicating the skeleton, among the plurality of pixels The information indicating the skeleton includes information indicating an element line segment which is an element of each skeleton line constituting the frame, and the display control unit , A symbol including a first element line segment parallel to the row direction or the column direction, and a second element line segment continuous with the first element line segment and having an inclination with respect to the first element line segment Correct the specified gradation when The gradation correction unit is a pixel arranged in the direction of the line width with respect to the pixel overlapping the intersection of the first element line segment and the second element Among the angles formed by the division, gradation correction such as thickening the line width is not performed for pixels in the region on the dominant side.

In addition, when the display control unit is a part of a pixel group constituting a display pixel of a symbol and the display pixel is a pixel group of a line width in which the display pixels are arranged in a line in the line width direction, The gradation correction unit further includes a distance calculation unit that calculates, for each element pixel group, the distance in the direction of the line width between the line segment and the central point of the element pixel group including pixels overlapping the element line segment. The pixels adjacent to the pixel at one end of the element pixel group and the pixels at the other end adjacent to the element pixel group in the line width direction and not included in the element pixel group are as follows: It is preferable that the gradation between the designated gradation and the gradation of the background of the displayed symbol be corrected according to the distance calculated by the distance calculation unit.

According to still another aspect of the present invention, the information processing method is based on the information indicating the skeleton of the symbol, on the display screen in which the pixels are arranged in a matrix, the designated gradation and the row direction or column of the matrix. An information processing method for displaying a symbol having a line width designated in any of the directions, which is a part of a pixel group constituting a display pixel of the symbol, wherein the display pixels are arranged in one line in the direction of the line width. When a pixel group corresponding to the line width is set as an element pixel group, an element line segment which is an element of a skeleton line constituting a skeleton and a central point in an element pixel group including display pixels overlapping the element line segment Calculating the distance in the direction of the line width, the tone of the pixel at one end included in the element pixel group including the center point, the tone of the symbol and the tone of the background of the symbol And the distance calculation step In comprising a step of correcting the gradation corresponding to the calculated distance, based on the correction, and generating display data for displaying the symbol on the display screen.

According to yet another aspect of the present invention, the program is a program for controlling an information processing apparatus having a display screen in which pixels are arranged in a matrix, and the program is based on information indicating a skeleton of a symbol. , Causing the information processing apparatus to execute a step of causing the display screen to display a symbol having a designated gradation and a line width designated in either the row direction or the column direction of the matrix, and displaying the symbol When a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is set as an element pixel group, which is a part of the pixel group constituting the display pixels Calculating a distance in the direction of line width between an element line segment which is an element and a center point of an element pixel group including a display pixel overlapping the element line segment; an element including the center point The gradation of the pixel at one end included in the element group is corrected to the gradation between the gradation of the symbol and the gradation of the background of the symbol according to the calculated distance Step of generating display data for displaying the symbol on the display screen based on the step of correction.

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

FIG. 2 is a block diagram showing a schematic configuration of an information processing apparatus. It is a block diagram showing the hardware constitutions of the computer system which functions as an information processor. It is a figure showing a part of character after correcting the character of odd line width. It is another figure showing a part of character after correcting the character of odd line width. It is a figure showing a part of character after correcting the character of even line width. It is another figure showing a part of character after correcting the character of even line width. 5 is a flowchart showing the flow of processing in the information processing apparatus. It is the flowchart which showed the detail of the process of FIG.7 S5. It is a figure for demonstrating the effect of gradation correction, (a) is a figure which showed the character (part) when not performing said gradation correction, (b) performed gradation correction It is the figure which showed the character (part) of 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 flow chart which showed a part of flow of processing 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 is performed. It is the figure which showed a part of character drawn using the diagonal element line segment and the element line segment which follows the said element line segment. It is a figure showing a part of character obtained by changing a function of a amendment restriction part. It is a figure showing 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 an upper limit and a lower limit in FIG.16 S55. It is the figure which showed the setting example of the upper limit, and the setting example of the lower limit. It is a figure showing an element line segment before amendment by a line segment amendment part, and an element line segment after amendment, and (a) is a figure showing an element line segment before amendment, and (b) is It is the figure which showed the element line segment after amendment. It is a figure showing an element line segment before amendment, and an element line segment after amendment, and (a) is a figure showing an element line segment before amendment, and (b) is an element line after amendment It is a figure showing minute L20 '. It is a figure showing an element line segment before amendment, and an element line segment after amendment, and (a) is a figure showing an element line segment before amendment, and (b) is an element line after amendment FIG. 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 to FIG. 20 and FIG. It is the flowchart which showed the flow of the process in FIG.22 S92. It is the flowchart which showed the flow of the process in FIG.23 S102. It is the flowchart which showed the flow of the process in FIG.23 S103. It is a figure which showed the character displayed when the start point and / or the end point of an element line segment are correct | amended by the line segment correction | amendment part, Comprising: (a) is a figure which showed M character, (b) Is a diagram showing the letter W. It is the figure which showed the data structure of skeleton data. It is the figure which showed the data structure about the skeleton data regarding the kanji like "tree." It is the figure which showed the skeleton data of FIG. 28 on the coordinate plane. It is a figure showing the example which gave a predetermined line width to a line segment, and (a) is a figure showing the example when the line width is made odd, (b) shows the line width. It is the figure which showed the example at the time of setting it as the even number.

Explanation of sign

Reference Signs List 1 information processing apparatus, 12 storage device, 13 first memory, 14 second memory, 15 control unit, 16 display control unit, 20 distance calculation unit, 21 tone correction unit, 22 display data generation unit, 30 parallel determination unit, 31 correction limit unit, 32 line correction unit.

An embodiment of an information processing apparatus according to the present invention will be described below with reference to FIGS. 1 to 26.

FIG. 1 is a block diagram showing a schematic configuration of the information processing apparatus 1. As shown in the figure, 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 an input from a user. When the user inputs data via the input unit 10, the first memory 13 stores the input data. As data to be input through the input unit 10, for example, data for specifying a symbol (for example, character code), data of symbol size, type information of symbol line width (for example, bold, middle, Data for specifying the symbol, data for specifying the color of the symbol, and the like. In the following, with respect to the type of line width of the symbol and the color of the symbol, default values are stored in advance in the storage device 12 and the user does not input a change instruction to the information processing apparatus 1 via the input unit 10 As long as it is configured to be displayed based on the default value.

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

In the following, it is assumed that the output unit 11 performs display using the RGB color model as an example of a color model. Further, hereinafter, the pixel value of the pixel is represented as (R, G, B). Furthermore, in the following, among the pixel values (R, G, B), the value of the element of R is “the value of R component”, the value of the element of G is “the value of G component”, and the value of the element of B is It is called "the value of the B component".

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

The first memory 13 is configured of volatile semiconductor memory such as RAM (Random Access Memory). In addition, the first memory 13 plays a role as a main storage device with which the CPU (not shown) of the control unit 15 directly exchanges data. 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. Although the information processing apparatus 1 according to the present embodiment includes the first memory 13 and the second memory 14, a part of the area of the first memory 13 is not provided independently of the second memory 14. It may be allocated as a memory area for VRAM.

The control unit 15 controls various processes in the information processing device 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. The tone correction unit 21 further includes a parallel determination unit 30, a correction limitation unit 31, and a line segment correction unit 32. The control unit 15 and each unit in the control unit 15 are functional blocks, and the 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 the 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 a 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 the symbol is displayed on the display screen, the gradation of the display pixel among 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 of skeleton data (see FIG. 28) will be referred to as “skeleton line”. That is, the skeleton line will be described as a line indicating the skeleton of the symbol after being changed to the size when displayed on the output unit 11.

Further, a pixel group which is a part of a pixel group constituting a display pixel of a symbol and in which the display pixels are arranged in a line in the direction of the line width is referred to as an “element pixel group”. Furthermore, a line segment that is an element of each skeleton line that constitutes the skeleton of the symbol is referred to as an "element line segment". That is, an element line segment is a line segment which becomes one element which constitutes a skeletal line, and is a line segment having a certain inclination.

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

The gradation correction unit 21 specifies the correction target pixel for each element line segment, and corrects the designated gradation of the correction target pixel to another gradation according to a predetermined rule. The tone correction unit 21 also performs correction on pixel values of respective color components (that is, R component pixel values, G component pixel values, and B component pixel values). Here, "gradation correction" refers to correction of the pixel value of each color component. Note that the specification of the correction target pixel and the specific gradation correction method will be described later.

The display data generation unit 22 generates display data for displaying a symbol 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 limitation unit 31, and the line segment correction unit 32 in the gradation correction unit 21 will be described later.

Here, one aspect of the specific configuration of the information processing device 1 according to the present embodiment will be described with reference to FIG. The figure is a block diagram showing the hardware configuration of a computer system 1000 that functions as the information processing apparatus 1.

Computer system 1000 includes, as main components, a CPU 110 for executing a program, a mouse 120 and a keyboard 130 for receiving an instruction input by a user of computer system 1000, data generated by execution of the program by CPU 110, or mouse 120 Alternatively, a RAM 140 for volatileally storing data input via the keyboard 130, a hard disk 150 for storing data in a nonvolatile manner, a CD-ROM (Compact Disk-Read Only Memory) driving device 160, and a monitor 170. A communication IF (Interface) 180 is included. Each component is connected to each other by a data bus. The CD-ROM 161 is mounted on the CD-ROM drive 160.

The input unit 10 in the information processing apparatus 1 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, and the first memory 13 and the second memory 14 Corresponds to the RAM 140.

Processing in computer system 1000 is realized by each hardware and software executed by CPU 110. Such software may be stored in advance in the hard disk 150. Also, 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 downloadable program product by an information provider connected to the so-called Internet. Such software is read from the storage medium by the CD-ROM drive 160 or another reader, 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. The CPU 110 executes the program.

Each component which comprises computer system 1000 shown in the figure is general. Therefore, an essential part of the present invention can be said to be software stored in the RAM 140, the hard disk 150, the CD-ROM 161 or other storage medium, or software downloadable via a network. The operation of each hardware of computer system 1000 is well known, and therefore detailed description will not be repeated.

The recording medium is not limited to CD-ROM, FD (Flexible Disk), hard disk, magnetic tape, cassette tape, 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 Programmable Read-Only Memory), EEPROM (Electronically Erasable Programmable Read-Only Memory), fixed semiconductor memory such as flash ROM May be a medium that carries the program.

The program referred to here includes not only a program directly executable by the CPU but also a program of source program format, a program subjected to compression processing, an encrypted program and the like.

By the way, the above-mentioned composition is only one mode of a concrete composition to the last, and the composition which does not have the above-mentioned mouse, and is equipped with the keyboard, the monitor, and the hard disk in the information processor 1 may be sufficient. The information processing apparatus 1 can also be configured as a portable type portable information terminal such as an electronic dictionary or a portable telephone.

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, a touch pen type input device may be provided as the input unit. Furthermore, 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. Further, from the viewpoint of downsizing, it is preferable to provide an apparatus for reading a memory card instead of the CD-ROM driving apparatus, and use the memory card as a recording medium instead of the CD-ROM.

Here, the process performed by the gradation correction unit 21 will be specifically described with reference to FIGS. 3 to 6. Moreover, below, a character is mentioned as an example and demonstrated 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, character size, line width type of the character, and character color. Identify Then, the display control unit 16 scales the skeleton data of the character based on the specified character size. Further, the line width (designated line width) when the display control unit 16 displays characters on the display screen of the output unit 11 in consideration of the specified character size and the type of the line width of the character is decide. Further, the display control unit 16 displays the characters on the display screen using the color (pixel value) of the specified characters. In addition, the method of using the color of a character is mentioned later.

As a result, the case where it is determined by the display control unit 16 to display the line width of the character using the odd number of continuous pixels in a line when displaying on the display screen will be described first. After that, a case where it is determined by the display control unit 16 to display the line width of characters using an even number of continuous pixels in one line when displaying on the display screen will be described.

In the following, when the information processing apparatus 1 expresses a line width using an odd number of continuous pixels in one row, the line width is referred to as “odd line width”. On the other hand, when the information processing apparatus 1 expresses the line width using an even number of continuous pixels in one line, the line width is referred to as “even line width”. Note that “odd line width” and “even line width” refer to line widths before tone correction to be described later. When 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 the Y-axis direction. In addition, when expressing the width of a character, pixels (pixel group) continuous in a line are used. For example, if the line width is 3, three consecutive pixels are used.

More specifically, when the information processing apparatus 1 expresses the width of a character, a pixel group (element pixel group) including pixels in which element line segments of a skeleton line overlap and continuous in a row in the X axis direction or Y axis direction Use. The control unit 15 determines which one of the pixel group continuous in the X-axis direction and the pixel group continuous in the Y-axis direction is used according to the inclination of the element line.

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

FIG. 3 is a diagram showing a part of the characters after the characters of the odd line width are corrected by the gradation correction unit 21. As shown in FIG. In addition, the same figure is also a view showing a part of the line width direction of the character.

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

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

Also in the present embodiment, the information processing apparatus 1 uses the pixel Pa, the pixel Pb, and the pixel Pc as a pixel group forming a character.

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

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

The tone correction unit 21 performs tone correction on the pixel Pa using the following equations (1) to (3), and the corrected pixel value (R, G, B) = (Rm, Gm, Bm) are obtained. Then, the gradation correction unit 21 sets the pixel value of the pixel Pa as the pixel value after correction, 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 pixel value after correction (R, G, B) = ( Rm, Gm, Bm) are obtained. Then, the gradation correction unit 21 sets the pixel value of the pixel Pd as the pixel value after correction, 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 background of the character, and are corrected to the gradation according to the distance calculated by the distance calculation unit 20.

Further, for the pixel Pa, the tone correction unit 21 performs correction that approaches the background tone from the character tone as the value of the distance | d | increases. On the other hand, for the pixel Pd, as the distance | d | becomes larger, the gradation correction unit 21 performs correction that approaches the gradation of the character from the gradation of the background.

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

As described above, the information processing device 1 corrects the line width from 3 to 4, and the information processing device 1 forms a part of the character by the pixel Pa, the pixel Pb, the pixel Pc, and the pixel Pd as shown in the figure. Do.

FIG. 4 is a view showing a part of the characters after the characters of the odd line width are corrected by the gradation correction unit 21 as in FIG. FIG. 4 differs from FIG. 3 in that the point G of the element line segment L1 is located on the negative direction side of the X axis with respect to the central point C of the pixel Pb which is the central pixel.

Therefore, 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, for the pixel Pc, the gradation correction unit 21 performs correction based on the above equations (1) to (3). On the other hand, for the pixel Pe, the tone correction unit 21 performs correction based on the above equations (4) to (6).

FIG. 5 is a view showing a part of the characters after the characters of the even line width are corrected by the gradation correction unit 21. As shown in FIG. In addition, the same figure is also a view showing a part of the line width direction of the character.

In the same figure, first, since the absolute value of the slope of the element line segment L1 is 1 or more, the control unit 15 sets the line width in the X-axis direction as in FIGS. 3 and 4.

Note that, in the conventional configuration in which the correction by the gradation correction unit 21 is not performed, two consecutive pixels such as a pixel Pf and a pixel Pg corresponding to an even line width (the line width in FIG. 2 is 2) form characters. It becomes a pixel group. Here, the reason that the pixel Pf is not the pixel constituting the character but the pixel Pf is the pixel constituting the character is that the distance between the central point of the pixel Pf and the element line L1 in the X axis direction is This is because the distance between the central point of and the element line segment L1 in the X-axis direction is smaller.

Also in the present embodiment, the information processing apparatus 1 uses the pixel Pf and the pixel Pg as a pixel group forming a character.

The distance calculation unit 20 calculates the distance in the X-axis direction between the central point C of the pixel group including 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 central 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 central point of the boundary line between the pixel Pf and the pixel Pg and the element line L1. Also in this case, when calculating the distance | d |, the distance between the center points of the pixels is 1. In other words, | d | takes a value of 0 to 0.5.

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

Further, the gradation correction unit 21 performs gradation correction on the pixel Ph using the above equations (4) to (6), and the pixel value after correction (R, G, B) = ( Rm, Gm, Bm) are obtained. Then, the gradation correction unit 21 sets the pixel value of the pixel Ph as the pixel value after correction, 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 background of the character, and are corrected to the gradation according to the distance calculated by the distance calculation unit 20.

Further, for the pixel Pf, the gradation correction unit 21 performs correction that approaches the gradation of the background from the gradation of the character as the value of the distance | d | increases. On the other hand, for the pixel Ph, as the distance | d | becomes larger, the gradation correction unit 21 performs correction that approaches the gradation of the character from the gradation of the background.

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

As described above, the information processing device 1 corrects the line width from 2 to 3, and the information processing device 1 configures a part of the character by the pixel Pf, the pixel Pg, and the pixel Ph as shown in the figure.

FIG. 6 is a view showing a part of the characters after the characters of the even line width are corrected by the gradation correction unit 21 as in FIG. 6 differs from FIG. 5 in that the point G of the element line segment L1 is on the negative direction side (left side of FIG. 6) of the X axis than the central point C of the pixel group composed of the pixels Pf and Pg. It is a point that exists.

Therefore, 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, for the pixel Pg, the gradation correction unit 21 performs correction based on the above equations (1) to (3). On the other hand, for the pixel Pi, the tone correction unit 21 performs correction based on the above equations (4) to (6).

In addition, since the said point G is a point used as the object of a process of calculation of distance | d |, below, the point G is called "the process target point G."

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

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

After step S1, the display control unit 16 reads the skeleton data specified by the acquired character code from the storage device 12 (S2). The read skeleton data is temporarily stored in the first memory 13. Then, after step S2, the display control unit 16 scales the read skeleton data based on the specified character size (S3).

After step S3, the display control unit 16 acquires stroke information on a 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 kanji “tree” example, four pieces of stroke information exist for the kanji.

After step S4, the display control unit 16 draws a stroke of a predetermined line width (designated line width) based on the acquired one stroke information and the type information of the line width of the specified character. (S5). Then, after step S5, the display control unit 16 determines whether the drawing has been performed for all the strokes included in the character (S6). Here, the above-mentioned "predetermined line width" refers to the line width of characters after correction by the gradation correction unit 21.

If it is not determined in S6 that the drawing has been performed for all the strokes, the information processing apparatus 1 returns the process to step S4 again. On the other hand, when it is determined that the drawing has been performed for all the strokes in S6, the information processing apparatus 1 ends the series of processes for the character.

FIG. 8 is a flowchart showing the details of the process of step S5 of FIG. In FIG. 8, the absolute value of the slope of the element segment is 1 or more, and the Y coordinate of the start point of the element segment is the Y coordinate of the end point of the element segment for each element segment. The case is also described as an example.

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

First, based on the stroke information, the distance calculation unit 20 acquires coordinate values of two points at both ends (start and end points) of one element line segment (S11). After step S11, the distance calculation unit 20 calculates the inclination k of the element line segment based on the acquired coordinate value (S12). Here, a line which is a line in the line width direction (the X-axis direction in FIGS. 3 to 6) and passes 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 point of the element line segment and the imaginary 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). Under the present circumstances, when the end of an element line segment overlaps, if it does not intersect with an imaginary line L2 passing the center of the pixel because the element line segment is short, the extension line of the element line segment and the imaginary line L2 Let the point of intersection be the above intersection point. Hereinafter, 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). Then, after step S14, the distance calculation unit 20 determines whether the line width determined above 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 center point C of the pixel 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 calculated center point C (S17). Specifically, the distance calculation unit 20 sets the absolute value of the difference between the value of the X coordinate of the processing target point G and the value of the X coordinate of the central point C as the distance | d |.

After step S17, the gradation correction unit 21 described above based on the pixel group of the line width in the X-axis direction (that is, the line width before correction) centering on the pixel having the central point C. The gradation is corrected in accordance with the distance | d | (S18). The tone correction unit 21 performs the above correction based on this pixel group, and as shown in FIG. 3 and FIG. 4, the pixel at one end of the pixel group (for example, the pixel Pa in FIG. 3) The gradation correction is performed on the pixel (for example, the pixel Pd in FIG. 3) adjacent to the pixel at the other end of the pixel group. Then, after step S18, the information processing device 1 advances the process to step S19.

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

After step S21, the tone correction unit 21 sets the tone according to the above-described 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. Correction is performed (S22). The tone correction unit 21 performs the above correction based on this pixel group, and as shown in FIG. 5 and FIG. 6, the pixel at one end of the pixel group (for example, the pixel Pf in FIG. 5) The gradation correction is performed on a pixel (for example, the pixel Ph in FIG. 5) adjacent to the pixel at the other end of the pixel group. Then, after step S22, the information processing device 1 advances the process to step S19.

In step S19, the distance calculation unit 20 adds the value k to the value of the X coordinate of the processing target point G, and adds 1 to the value of the Y coordinate. After step S19, the control unit 15 determines whether 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 information processing device 1 returns the process to step S15 again. On the other hand, if it is determined in step S20 that the two match, in step S12, the display control unit 16 performs the process based on steps S12 to S23 described above on all the element line segments included in the skeleton line of the stroke. It is determined whether or not it is (S24).

If it is determined in step S24 that the process has not been performed on all the line segment elements, the information processing device 1 returns the process to step S11 again. On the other hand, when it is determined in step S24 that the process has been performed on all the line segment elements, the information processing device 1 returns the process to step S6 in FIG.

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

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

As described above, since the information processing device 1 performs gradation correction in accordance with the distance | d |, the information processing device 1 stores, in the storage device, data used for gradation correction such as a lookup table at the time of correction. There is no need to keep it. In addition, since the information processing apparatus 1 calculates the gradation of the pixel according to only the distance | d |, the information processing apparatus 1 has the gradation compared to the configuration in which data in the lookup table is accessed for each pixel. The time required for correction can be shortened.

By the way, in the data storage area of the second memory 14 functioning as a VRAM, there are the following two methods when the display data generation unit 22 generates characters whose tone is corrected as described above.

The first method is a method of drawing character data directly in the second memory 14. That is, using the data already stored in the second memory 14 (that is, the video data being displayed) as the character background data, the information processing apparatus 1 performs the gradation correction (hereinafter, the direct drawing method) It is called).

In the second method, the degree of character color contribution, which will be described later, is stored in a memory other than the second memory 14 (hereinafter referred to as temporary memory), and the information processing apparatus 1 uses the degree of character color contribution. This is a method of updating data (video data being displayed) stored in the second memory 14 (hereinafter referred to as an indirect drawing method).

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

FIG. 10 is a flowchart showing the flow of processing when the direct drawing method is performed. Specifically, it is a flow chart showing 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 degree” means that the color (specifically, the value of each color component) of the character before gradation correction by the gradation correction unit 21 is 100, and the character after gradation correction is before gradation correction. It is a value indicating how much the color of the character contributes.

Specifically, for the pixel Pa in FIG. 3, the degree of character color contribution is 100 × (1− | d |). Further, the gradation correction is not performed for the pixel Pb and the pixel Pc in FIG. Furthermore, for the pixel Pd in the same drawing, the degree of character color contribution is 100 × | d |. Further, in the region other than the pixels Pa to Pd in FIG.

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

When 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 gradation correction unit 21 updates the pixel to be updated with the character color itself.

On the other hand, when it is not determined that the degree of contribution is 100 in step S32, the gradation correction unit 21 acquires the pixel value (Rb, Gb, Bb) of the update target pixel (S34). After step S34, the gradation correction unit 21 uses the pixel values (Rf, Gf, and Bf), the pixel values (Rb, Gb, and Bb), and the calculated character color contribution factor to calculate the corrected pixels. A value is calculated (S35). The calculation of the pixel value after correction is omitted here because it uses the above-mentioned equations (1) to (3) and equations (4) to (6). In Equations (1) to (6), calculation is performed using a value obtained by dividing the degree of 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 pixel value after correction (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 the character color contribution degree 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 degree of character color contribution is already stored, control unit 15 determines that the degree of character color contribution K1 determined in step S41 is greater than the degree of character color contribution K2 already stored. It is judged whether it is large (S43). On the other hand, when it is not determined in S42 that the degree of character color contribution is already stored, the information processing device 1 advances the process to step S44.

If it is not determined in step S43 that the value is large, the information processing device 1 causes the process to proceed to step S45. On the other hand, when it is determined in step S43 that the value is large, the information processing device 1 causes the process to proceed to step S44. In step S44, the character color contribution rate of the update target pixel is set to K1. Then, after step S44, the information processing device 1 causes the process to proceed to step S45.

In step S45, display control unit 16 determines whether or not the process has been performed on all update target pixels included in one character. If it is determined in step S45 that the process has not been performed on all update target pixels, the information processing device 1 returns the process to S41 again.

On the other hand, when it is determined in step S45 that the process has been performed on all update target pixels, the information processing device 1 calculates the pixel value of each pixel using the character color contribution degree stored in the temporary memory. The pixel value in the second memory 14 is updated using the calculated pixel value (S46). Gradation correction is performed by this updating process. Since the information processing apparatus 1 uses the above-described equations (1) to (3) and equations (4) to (6) for the calculation of the pixel value, the description will not be repeated here.

The indirect drawing method is configured to update the pixel values in the second memory 14 after obtaining the character color contribution degree of all the update target pixels, and therefore differs from the flow in FIG. 7 in which drawing is performed for each stroke. It will be.

Further, when the information processing apparatus 1 uses the direct drawing method, the information processing apparatus 1 does not need a temporary memory as used in the indirect drawing method. Further, since transfer from the temporary memory to the second memory 14 is also unnecessary, the information processing apparatus 1 can speed up the process.

On the other hand, when the information processing apparatus 1 uses the indirect drawing method, the information processing apparatus 1 generates a character color at another point where the element line segments cross or where the element line segments are crowded. Can be prevented from becoming higher than the gradation of.

By the way, in the above, the information processing apparatus 1 performs the above-described gradation correction by the gradation correction unit 21 whether the element line segment is parallel to the X axis or parallel to the Y axis. However, the symbol drawn by the element segment parallel to the X axis (part of the symbol) and the symbol drawn by the element segment parallel to the Y axis (part of the symbol) Jaggies do not occur. For this reason, it is preferable that the information processing device 1 perform the above-described gradation correction only for the element line segment having an inclination with respect to the X axis and the Y axis (that is, an oblique line segment).

Therefore, in the following, a configuration in which the information processing apparatus 1 uses the parallel determination unit 30 and the correction limitation unit 31 will be described.

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 a skeleton line).

The correction limiting unit 31 limits the correction so that the gradation correction described above is not performed for an element pixel group including pixels overlapping with the element line segment determined to be parallel by the parallel determination unit 30.

FIG. 12 is a diagram showing a part of symbols obtained when the limitation of correction is performed using the parallel determination unit 30 and the correction limitation unit 31. As shown in FIG. Note that, in the drawing, dotted lines are lines connecting center points of pixels.

As shown in the figure, the element line segment L3 is a diagonal line segment, and the element line segment L4 is a line segment parallel to the Y axis. When the information processing apparatus 1 displays a part of a character based on the element line segment L3, as shown in the figure, the gradation correction unit 21 performs gradation correction. Then, the line width is increased from 3 to 4 by the correction. On the other hand, when the information processing apparatus 1 displays a part of the symbol based on the element line segment L4, as shown in the figure, the correction limiting unit 31 limits the correction of the gradation.

As a result, the information processing apparatus 1 can not make the shaggy visible for the oblique character portion, and can prevent the character from being blurred for the character portion parallel to the Y axis. Furthermore, for the element line segment parallel to the X axis and the Y axis, since the calculation of the gradation correction based on the distance | d | becomes unnecessary, the information processing apparatus 1 generates the gradation relative to the parallel element line segment It becomes possible to shorten the time which display requires compared with the composition which performs the operation of amendment.

Thus, the correction limiting unit 31 determines the pixel at one end of the element pixel group including the pixel overlapping with the element line segment determined to be parallel by the parallel determination unit 30 (for example, the pixel Pj in FIG. 12). For the pixels adjacent to the other end of the element pixel group and not included in the element pixel group (for example, the pixel Pk in the figure), the correction by the gradation correction unit 21 is performed. It can be said that the configuration is to limit the

By the way, when the information processing apparatus 1 corrects the gradation using 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 same figure, the above-mentioned correction limitation by the correction limiting unit 31 is performed.

In this case, as shown in the figure, the information processing device 1 corrects the gradation also for the pixel Pm and the pixel Pn. Therefore, in a region on the superior angle side (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 Is formed. Because of this, the appearance of the character becomes worse.

Therefore, hereinafter, a configuration will be described in which the information processing apparatus 1 prevents the appearance of the characters from being deteriorated by changing a part of the function of the correction limiting unit 31.

FIG. 14 is a view showing a part of characters obtained by changing the function of the correction limiting unit 31 in this manner. When the information processing apparatus 1 draws a part of a character using the element line segment L5 and the element line segment L6, as shown in the figure, the information processing apparatus 1 includes at least a pixel Pm and a pixel Pn. No gradation correction is performed for.

In the following, processing for displaying such good-looking characters will be described based on FIGS. 15 to 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 described. In the same figure, the start point of the element line segment L10 is the point H, the end point of the element line segment L10, and the start point of the element line segment L11 is the end point of the element line segment L11, and the element line segment L12 The end point is a point J, and the end point of the element line L12 is a point K.

In the scaled coordinate data, it is assumed that the coordinate value of point H, the coordinate value of point I, the coordinate value of point J, and the coordinate value of point K are arranged in this order. Furthermore, the information processing apparatus 1 first draws a stroke based on the element line segment L10, then draws a stroke based on the element line segment L11, and finally draws a stroke based on the element line segment L12. Do.

Furthermore, when the information processing apparatus 1 is drawing a stroke based on the element line segment L11, the element line segment L10 is referred to as "element line segment immediately before drawing object", and the element line segment L12 is It is called "element line segment immediately after". Further, in the figure, a point on the element line segment L11 used for the drawing, among the above-described processing target points G, a point S to be processed first, and a process at the end The point to be performed is indicated as point E. Further, 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 coordinate values of the element line segment L10 (that is, coordinate values of the point H and the point I in FIG. 15) from the scaled skeleton data (S51). After step S51, the distance calculation unit 20 calculates the inclination of the element line segment L10 (S52). Then, after step S52, the distance calculation unit 20 calculates coordinate values of the point S and the point E (S53). Furthermore, after step S53, the distance calculation unit 20 sets the processing target point G as the point S (S54).

After step S54, the display control unit 16 sets the upper limit Xmax and the lower limit Xmin in the X-axis direction (S55). Here, the reason why the display control unit 16 sets the upper limit value and the lower limit value in the X-axis direction is that the inclination of the element line segment L10 is 1 or more, and a line width is formed in the X-axis direction. When the inclination of the element line segment is 1 or less, the upper limit value and the lower limit value are set in the Y-axis direction. Then, after step S55, the distance calculation unit 20 determines whether the line width is an odd number (S56). Here, the line width is a line width before tone 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 central point of the pixel (that is, the central point C) closest to the processing target point G (S57). In the following, the coordinate values of the processing target point G are denoted by (Xg, Yg), and the coordinate values of the central point C are denoted by (Xc, Yc). In this case, Yg and Yc have the same value. That is, the coordinate value of the central point C can also be expressed as (Xc, Yg).

After step S57, the distance calculation unit 20 determines whether Xg is not less than Xmin and not more than Xmax (S58). If it is determined in step S58 that Xmin or more and Xmax or less, the distance calculation unit 20 calculates the distance | d | between the processing target point G and the central point C (S59). Then, 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). Then, 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 Xmin or more and Xmax or less, the distance calculation unit 20 determines that the point (Xc, Yg) is a pixel group (element) consisting of continuous pixels in the line width direction. The display control unit 16 draws a part of the stroke without performing the gradation correction as in the related art, as the center point of the pixel group (S62). That is, without the gradation correction being performed on the pixel Pn and the pixel Pm illustrated in FIG. 14, the information processing device 1 can keep the pixels Pn and Pm as the background color. Therefore, the information processing apparatus 1 can obtain good looking characters. After step S62, the information processing device 1 causes the process to proceed to step S61.

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

After step S63, the distance calculation unit 20 determines whether Xg is not less than Xmin and not more than Xmax (S64). If it is determined in step S64 that Xmin or more and Xmax or less, the distance calculation unit 20 calculates the distance | d | between the processing target point G and the central point C (S65). Then, after step S59, the gradation correction unit 21 draws a part of the stroke (see FIG. 5) as described above, using the distance | d | calculated by the distance calculation unit 20 (S66). Then, after step S66, the information processing device 1 causes the process to proceed to step S61.

On the other hand, when it is not determined in step S64 that Xmin or more and Xmax or less, the information processing device 1 proceeds with the process 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 information processing device 1 returns the process 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 the process has been performed for all of the element line segments L10, L11, and L12 included in the one stroke ( S68).

If it is not determined in step S68 that the process has been performed on all the element line segments, the information processing device 1 returns the process to step S51 again. On the other hand, when it is determined in step S68 that the processing has been performed for all the element line segments, the information processing apparatus 1 ends the processing.

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

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

If it is 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 coordinate of the central point of the pixel including the point S (S73). Thereafter, the information processing device 1 proceeds with the process to step S76. On the other hand, when it is not determined to be odd in step S72, 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 information processing device 1 proceeds with the process 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 values that can be taken by Xg (S75). Thereafter, the information processing device 1 proceeds with the process to step S76.

In step S76, the display control unit 16 determines, based on the coordinate values of the point J and the point K, whether the element line segment L12 immediately after it is a line segment parallel to the X axis or the Y axis. If it is determined in step S76 that the line segments are parallel, the display control unit 16 determines whether the line width is an odd number (S77). Here, the line width is a line width before tone correction.

If it is 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 coordinate of the central point of the pixel including the point E (S78). Thereafter, the information processing device 1 ends the process. On the other hand, if it is not determined to be odd in step S77, 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 information processing device 1 ends the process.

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 a maximum value among the values that can be taken by Xg (S80). Thereafter, the information processing device 1 ends the process.

FIG. 18 is a diagram showing an example of setting the upper limit value and an example of setting the lower limit value.
18 (a) is a diagram showing the upper limit value Xmax for the X coordinate as shown in the flow of FIG. 17, and FIG. 18 (b) is the X coordinate as shown in the flow of FIG. Is a diagram showing a lower limit value Xmin for. FIG. 18C is a diagram showing the upper limit Ymax of the Y coordinate, and FIG. 18B is a diagram showing the lower limit Ymin of the Y coordinate.

Here, a line passing each center point in each element pixel group including pixels overlapping with an element line segment parallel to the X axis or Y axis (for example, a vertical line or a horizontal line in FIG. 18) 1 virtual line) That is, the imaginary line L15 is a line segment parallel to the X axis if the element line segment is parallel to the X axis, and is a line segment parallel to the Y axis if the element line segment is parallel to the Y axis. The thick dotted lines in FIGS. 13 and 14 correspond to the imaginary line L15.

In addition, it passes through the center point in an element pixel group including pixels that are continuous with the parallel element line segment and that overlap with another element line segment (for example, the hatched portion in FIG. 18) having an inclination with respect to the element line segment. A line that is perpendicular to the first virtual line is a “virtual line L16 (second virtual line)”. That is, the virtual line L16 is a line in the line width direction (the X-axis direction in FIGS. 3 to 6) and passes through the centers of the respective pixels, similarly to the above-described virtual line L2. In FIG. 14, the virtual line L16 is a line parallel to the X-axis direction.

When the virtual line L15 and the virtual line L16 are defined as described above, the correction limiting unit 31 determines that the position of the intersection of the virtual line L16 and the other element line segment satisfies the predetermined relationship with the position of the virtual line L15. , It can be said that the following configuration. That is, the correction limiting unit 31 determines that the pixel at one end of the element pixel group including the pixel overlapping the intersection, the pixel at the other end of the element pixel group, and the pixel adjacent in the direction of the line width At the same time, it can be said that the correction of gradation by the gradation correction unit 21 is limited for the pixels not included in the element pixel group.

By the way, in FIGS. 14 to 18, in order to display characters with good appearance, the correction limiting unit 31 limits the correction of gradation for a predetermined pixel (for example, the pixel Pm and the pixel Pn in FIG. 14). . In the following, a configuration will be described in which the information processing device 1 uses the line segment correction unit 32 in order to cause the information processing device 1 to similarly display visually pleasing characters.

The line segment correction unit 32 changes the length of an element line segment without changing the inclination of the element line segment for a predetermined element line segment. Specifically, the line segment correction unit 32 changes the length of the element line segment by changing the coordinate value of the start point of each element line segment and the coordinate value of the end point.

FIG. 19 is a diagram showing element line segments L20 and L21 before correction by the line segment correction unit 32, and element line segments L20 ′ and L21 ′ after correction. FIG. 19A shows an element line segment before correction, and FIG. 19B shows an element line segment 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. Further, the element line segment L20 has a predetermined inclination with respect to the element line segment L21. Furthermore, in the figure, the element line segment L20 has an inclination of 1 or more with respect to the X axis.

Further, 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 .

In the following, the information processing apparatus 1 corrects the element line segment L20 to an element line segment L20 ′ illustrated in FIG. 19B, and corrects the element line segment L21 to an element line segment L21 ′ illustrated in FIG. The specific method to carry out will be described. First, correction of the element line segment L20 will be described.

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

Here, as shown in FIGS. 20 (a) and 20 (b), a line passing through each central point in each element pixel group including pixels overlapping with the element line segment L21 parallel to the Y axis is referred to as “virtual line L30. (First virtual line) Further, an intersection point of the imaginary line L30 and the element line segment L20 is referred to as an “intersection point Q”.

The line segment correction unit 32 corrects the length of the element line segment L20 to such a length that only the pixel adjacent to the pixel including the intersection point Q is reached. For example, in the example shown in FIG. 20B, the line segment correction unit 32 changes the X coordinate value of the end point of the element line segment L20 from the X coordinate value of the intersection point Q to the Then, the Y coordinate value of the end point is corrected to the value obtained by subtracting 1 from the Y coordinate value of the intersection point Q. By the correction, the line segment correction unit 32 corrects the length of the element line segment L20 to such a length that only the pixel adjacent to the pixel including the intersection point Q is 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 an element line segment L21 before correction, and FIG. 21B shows an element line segment L21 ′ after correction.

The line segment correction unit 32 corrects the length of the element line segment L21 to a length that reaches the pixel including the intersection point Q. For example, in the example illustrated in FIG. 21B, the line segment correction unit 32 performs the correction to reduce the Y coordinate value of the start point of the element line segment L21 by 1 to obtain the length of the element line segment L21 as The length to reach the pixel including the intersection point Q is corrected. That is, the start point of the element line segment L21 'after correcting the element line segment L21 is the point U'.

FIG. 22 is a flow chart showing a process flow when correcting the lengths of the element line segments shown in FIG. 20 and FIG. The figure is also a flowchart showing the details of the process in the 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 (the coordinate values of the point T, the point U and the point V in FIG. 19) 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 the end point (S92). The details of step S92 will be described later.

Furthermore, after step S92, the line segment correction unit 32 generates an element line segment using the corrected coordinate value, and based on the element line segment, the gradation corresponding to the distance | d | A correction is performed (S93). Note that step S93 is the same as the process from step S12 to step S23 in FIG. 8, and thus the description thereof will not be repeated.

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

If it is determined in step S94 that processing has not been performed on all line segment elements, the information processing device 1 returns the process to step S91 again. On the other hand, when it is determined in step S94 that the process has been performed on all line segment elements, the information processing apparatus 1 ends the process shown in FIG. 22 and returns the process to step S6 in FIG. .

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

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

If it is determined in step S101 that there is a diagonal line, the line segment correction unit 32 corrects the start point and / or the end point of the element line segment of the diagonal line (S102). Then, after step S102, the information processing apparatus 1 ends the process.

On the other hand, when it is not determined in step S101 that the line segment is a diagonal line, the line segment correction unit 32 corrects the start point and / or the end point of the element line segment that is not the diagonal line (S103). Then, after step S103, the information processing device 1 ends the process.

Next, the details of the process of step S102 in FIG. 23 will be described. FIG. 24 is a flow chart showing the flow of processing in step S102. That is, FIG. 24 is also a flowchart showing a 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). In addition, when there is no element line segment immediately before (for example, in the case of the element line segment L20), the display control unit 16 determines that the line segments are not parallel.

If it is determined in step S111 that the line segments are parallel, the display control unit 16 determines whether the line width is an odd number (S112). Here, the line width is a line width before tone correction. On the other hand, when it is not determined in step S111 that the line segments are parallel, the information processing device 1 causes the process to proceed 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 coordinate of the center point of the pixel including the start point (S113). Thereafter, the information processing device 1 causes the process to proceed to step S115. On the other hand, when it is not determined to be an odd number in step S112, 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 information processing device 1 causes the process to proceed to step S115.

In step S115, the line segment correction unit 32 determines whether the X coordinate value of the start point is smaller than the lower limit value Xmin. If it is determined in step S115 that the line segment correction unit 32 determines that the line segment correction unit 32 determines that the coordinate value of the intersection point Q between the straight line satisfying X = Xmin (that is, the imaginary line L30) and the element line segment to be processed While obtaining (Xq, Yq), the start point is changed to (Xq + k, Yq + 1) (S116). After step S116, the information processing device 1 causes the process to proceed to step S117. On the other hand, when it is not determined in step S115 that the size is small, the information processing device 1 causes the process to proceed to step S117.

In step S117, the display control unit 16 determines, based on the coordinate values of the start point and the end point of the element segment immediately after that, whether or not the element segment immediately after is a line segment parallel to the X axis or Y axis. Judge based on. In addition, when there is no element line segment immediately after, the display control unit 16 determines that the line segments are not parallel.

If it is determined in step S117 that the line segments are parallel, the display control unit 16 determines whether the line width is an odd number (S118). Here, the line width is a line width before tone correction. On the other hand, when it is not determined in step S117 that the line segments are parallel, the information processing apparatus 1 ends the process.

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 coordinate of the center point of the pixel including the end point (S119). Thereafter, the information processing device 1 proceeds with the process to step S121. On the other hand, when it is not determined to be odd in step S118, 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 information processing device 1 proceeds with the process to step S121.

In step S121, the line segment correction unit 32 determines whether the X coordinate value of the end point is larger than the upper limit value Xmax. When it is determined in step S121 that the line segment correction unit 32 determines that the line segment correction unit 32 determines the coordinate value of the intersection point Q between the straight line satisfying X = Xmax (that is, the imaginary 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 information processing device 1 ends the process. For example, with regard to the element line segment L20, correction of the end point is performed in step S122.

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

First, the display control unit 16 determines whether the immediately preceding element line segment is a hatched line (that is, a line segment not parallel to the X axis or the Y axis), the coordinates of the start point and the end point of the element line segment immediately before It judges based on a value (S131). In addition, when there is no element line segment immediately before, the display control unit 16 determines that it is not a diagonal line.

If it is determined in step S131 that the line width is hatched, the display control unit 16 determines whether the line width is an odd number (S132). Here, the line width is a line width before tone correction. On the other hand, when it is not determined in step S131 that the line segments are parallel, the information processing device 1 causes the process to proceed 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 coordinate of the central point of the pixel including the start point (S133). Thereafter, the information processing device 1 causes the process to proceed to step S135. On the other hand, when it is not determined to be an odd number in step S132, 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 information processing device 1 causes the process to proceed to step S135.

In step S135, the line segment correction unit 32 determines whether the X coordinate value of the start point is larger than the upper limit value Xmax. If it is determined in step S135 that the line segment correction unit 32 determines that the coordinate value (Xq, Yq) of the intersection point Q of the straight line satisfying X = Xmax (that is, the imaginary line L30) and the element line immediately before it is determined. While determining the Y coordinate value of the start point to Yq (S136). After step S136, the information processing device 1 causes the process to proceed to step S137. On the other hand, when it is not determined in step S135 that the value is large, the information processing device 1 causes the process to proceed to step S137.

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

If it is determined in step S137 that the line width is hatched, the display control unit 16 determines whether the line width is an odd number (S138). Here, the line width is a line width before tone correction. On the other hand, when it is not determined in step S137 that it is a diagonal line, the information processing device 1 ends the process.

If 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 coordinate of the central point of the pixel including the end point (S139). Thereafter, the information processing device 1 proceeds with the process to step S141. On the other hand, if it is not determined to be odd in step S138, 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 information processing device 1 proceeds with the process to step S141.

In step S141, the line segment correction unit 32 determines whether 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 determines that the line segment correction unit 32 determines the coordinate value (Xq, Yq) of the intersection point Q of the straight line satisfying X = Xmin (that is, the imaginary line L30) and the element line segment immediately after that. While determining the Y coordinate value of the end point to Yq (S142). After step S142, the information processing device 1 ends the process. For example, with regard to the element line segment L21, the correction of the start point is performed in step S136.

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

For example, in FIG. 26A, in a white circle, in a region extending from the center line (corresponding to the imaginary line L30) of the element segment parallel to the Y axis to the left side of the drawing, the coordinate value of the parallel element segment and The coordinate value with the element line segment of the oblique line continuous to the line segment is corrected.

Further, in FIG. 26B, in a white circle, in a region extending from the center line (corresponding to the imaginary line L30) of the element segment parallel to the Y axis to the right side of the drawing, the coordinate value of the parallel element segment and The coordinate value with the element line segment of the oblique line continuous to the line segment is corrected.

As shown in FIGS. 26 (a) and 26 (b), the information processing apparatus 1 can display characters with a good appearance by correction using the line segment correction unit 32.

Further, in the case of the configuration in which the element line segment is corrected by the line segment correction unit 32, the information processing device 1 corrects the start point and the end point of the element line segment in advance. Therefore, it is not necessary to determine whether the upper limit value or the lower limit value as described above is exceeded. Therefore, the information processing apparatus 1 can shorten the time required for display as compared with the processing method described based on FIGS. 15 to 18.

By the way, in the above, for example, as shown in FIG. 3, a configuration in which gradation correction is performed also on a pixel Pd adjacent to an element pixel group (a pixel group consisting of a pixel Pa, a pixel Pb and a pixel Pc) is exemplified. explained. However, the present invention is not limited to this, and the information processing apparatus 1 may have a configuration in which the gradation is not corrected for the pixel Pd. Further, in this case, the information processing apparatus 1 may be configured to correct the gradation of the pixel Pc instead of correcting the gradation of the pixel Pa.

In the above, the configuration using the RGB color model has been described as an example, but the present invention is not limited to this. It may be a color model using additive color mixture.

It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims.

Claims

An information processing apparatus (1) for displaying symbols on a display screen in which a plurality of pixels are arranged in a matrix,
The storage unit (12) stores information indicating a skeleton of the symbol, and the information indicating the skeleton includes information indicating an element line segment which is an element of each skeleton line constituting the skeleton,
When the symbol is displayed so as to have the designated gradation and the designated line width in either the row direction or the column direction of the matrix based on the information indicating the skeleton, among the plurality of pixels, Further comprising a display control unit (16) that determines the gradation of the display pixels of
The display control unit (16)
When a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is a part of a pixel group constituting the display pixel of the symbol, the element line segment A distance calculation unit (20) for calculating, with respect to each of the element pixel groups, a distance in the direction of the line width from the central point of the element pixel group including the pixel overlapping with the element line segment;
The gradation of the pixel at one end included in the element pixel group including the central point is the gradation between the designated gradation and the gradation of the background of the symbol to be displayed. A tone correction unit (21) for correcting the tone according to the distance calculated by the distance calculation unit (20);
An information processing apparatus (1) including: a display data generation unit (22) that generates display data for causing the display screen to display the symbol based on the correction by the gradation correction unit (21).
The pixel at the one end is a pixel located on the opposite side of the point on the element line segment which is separated from the central point by the distance in the direction of the line width from the central point. The information processing apparatus (1) according to the item [1].
The gradation correction unit (21) is a pixel adjacent to the pixel at the other end of the element pixel group including the pixel subjected to the correction and the line width in the direction of the line width, and is included in the element pixel group The uncorrected pixel is also corrected to a gradation between the gradation of the symbol and the gradation of the background of the symbol according to the distance calculated by the distance calculating unit. The information processing apparatus (1) according to item 1.
The tone correction unit (21)
With regard to the pixels at the one end, as the distance becomes longer, correction is made to approach the gradation of the background from the gradation of the symbol,
The information processing apparatus (1) according to claim 3, wherein the adjacent pixels are corrected so as to approach the gradation of the symbol from the gradation of the background as the distance becomes longer.
When the symbol is displayed based on a plurality of the element line segments, whether or not each element line segment is a straight line parallel to the row direction or the column direction is based on the information indicating the skeleton line. A parallel determination unit (30) for determining
The pixel at one end of the element pixel group including the pixel overlapping with the element line segment determined to be parallel by the parallel determination unit (30) and the pixel at the other end of the element pixel group And a correction limiting unit (31) for limiting the correction by the gradation correction unit for the pixels adjacent to the direction of the line width and the pixels not included in the element pixel group. The information processing apparatus (1) according to claim 3.
When the symbol is displayed based on an element line segment parallel to the row direction or the column direction and another element line segment continuous with the parallel element line segment and having an inclination with respect to the element line segment A line passing through each center point in each element pixel group including pixels overlapping the parallel element line segment is a first virtual line, and a center point in the element pixel group including pixels overlapping the other element line segment Assuming that a line perpendicular to the first virtual line passing through is a second virtual line,
When the position of the intersection of the second virtual line and the other element line segment and the position of the first virtual line satisfy a predetermined relationship, the one in the element pixel group including pixels overlapping the intersection A correction limiting unit (31) for limiting the correction of gradation by the gradation correction unit for the pixel at the end of the pixel and the pixel at the other end adjacent to the element pixel group The information processing apparatus (1) described in the section.
Assuming that the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction on the display screen,
In the case where the first virtual line is parallel to the Y axis and the other element line segment exists on the negative direction side of the X axis with respect to the first virtual line, the predetermined relationship is the X of the intersection point. The information processing apparatus (1) according to claim 6, wherein the value of the coordinate is larger than the value of the X coordinate of the first virtual line.
Assuming that the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction on the display screen,
In the case where the first virtual line is parallel to the Y axis and the other element line segment exists on the positive direction side of the X axis with respect to the first virtual line, the predetermined relationship is the X of the intersection point. The information processing apparatus (1) according to claim 6, wherein the value of the coordinate is smaller than the value of the X coordinate of the first virtual line.
Assuming that the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction on the display screen,
In the case where the first virtual line is parallel to the X axis and the other element line segment exists on the negative direction side of the Y axis with respect to the first virtual line, the predetermined relationship is the intersection point of the intersection point The information processing apparatus (1) according to claim 6, wherein the value of the Y coordinate is larger than the value of the Y coordinate of the first virtual line.
Assuming that the positive direction of the X axis is the row direction and the negative direction of the Y axis is the column direction on the display screen,
In the case where the first virtual line is parallel to the X axis and the other element line segment exists on the positive direction side of the Y axis with respect to the first virtual line, the predetermined relationship is the intersection point of the intersection point The information processing apparatus (1) according to claim 6, wherein the value of the Y coordinate is smaller than the value of the Y coordinate of the first virtual line.
When the symbol is displayed based on an element line segment parallel to the row direction or the column direction and another element line segment continuous with the parallel element line segment and having an inclination with respect to the element line segment Assuming that a line passing through each center point in each element pixel group including pixels overlapping the parallel element line segment is a first virtual line,
When the first virtual line overlaps the pixel overlapping the first element line, and the first virtual line and the second element line intersect, the length of the second element line is An element line segment correction that corrects the length of the first element line segment to a length reaching the pixel including the intersection point while correcting the length to reach only the pixel adjacent to the pixel including the intersection point The information processing apparatus (1) according to claim 3, comprising a unit (32).
The symbol is determined by additive color mixing.
The information processing apparatus (1) according to claim 1, wherein the gradation correction unit corrects the gradation by correcting a pixel value for each of the additive primary colors.
An information processing apparatus (1) for displaying symbols on a display screen in which a plurality of pixels are arranged in a matrix,
The symbol is displayed on the display screen such that it has a designated gradation and a designated line width in either the row direction or the column direction of the matrix based on the information indicating the skeleton of the symbol stored in the storage device. A display control unit that determines the gradation of the display pixel among the plurality of pixels, and the information indicating the skeleton is an element line segment that is an element of each skeleton line that constitutes the skeleton Including the information shown
The display control unit (16)
A first element line segment parallel to the row direction or the column direction as the element line segment, and a second element line segment continuous with the first element line segment and having an inclination with respect to the first element line segment And a tone correction unit (21) for correcting the designated tone when displaying the symbol including
The gradation correction unit (21) is a part of a group of pixels constituting the display pixel of the symbol, and includes pixels overlapping the intersection of the first element line segment and the second element line segment. Assuming that the pixel group for the line width continuous in the direction of the line width is an element pixel group, the pixel adjacent to the pixel at the end of the element pixel group in the direction of the line width is included in the element pixel group The information processing apparatus (1), wherein the correction of the gradation is not performed with respect to pixels in an area on the dominant angle side among the angles formed by the two consecutive element line segments, which are not included pixels.
An information processing apparatus (1) for displaying symbols on a display screen in which a plurality of pixels are arranged in a matrix,
The symbol is displayed on the display screen such that it has a designated gradation and a designated line width in either the row direction or the column direction of the matrix based on the information indicating the skeleton of the symbol stored in the storage device. And a display control unit (16) for determining the gradation of the display pixel among the plurality of pixels, and the information indicating the skeleton is an element which is an element of each skeleton line constituting the skeleton Contains information indicating line segments,
The display control unit (16)
A first element line segment parallel to the row direction or the column direction as the element line segment, and a second element line segment continuous with the first element line segment and having an inclination with respect to the first element line segment And a tone correction unit (21) for correcting the designated tone when displaying the symbol including
The gradation correction unit (21) is a pixel arranged in the direction of the line width with respect to a pixel overlapping the intersection of the first element line segment and the second element line segment, and the two continuous element lines are continuous An information processing apparatus (1) which does not perform gradation correction such that a line width is thickened for pixels in an area on the dominant side among angles formed by a minute.
The display control unit (16)
When a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is a part of a pixel group constituting the display pixel of the symbol, the element line segment A distance calculation unit (20) for calculating, for each of the element pixel groups, a distance in the direction of the line width from the central point of the element pixel group including the pixel overlapping with the element line segment;
The gradation correction unit (21) is a pixel adjacent to the pixel at one end of the element pixel group, the pixel at the other end adjacent to the element pixel group, and the line width. The pixels not included in the element pixel group are gradations between the designated gradation and the gradation of the background of the displayed symbol, and the distance calculated by the distance calculation unit (20) 14. The information processing apparatus (1) according to claim 13, wherein the information processing apparatus corrects the gradation according to.
The display control unit (16)
When a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is a part of a pixel group constituting the display pixel of the symbol, the element line segment A distance calculation unit (20) for calculating, for each of the element pixel groups, a distance in the direction of the line width from the central point of the element pixel group including the pixel overlapping with the element line segment;
The gradation correction unit (21) is a pixel adjacent to the pixel at one end of the element pixel group, the pixel at the other end adjacent to the element pixel group, and the line width. The pixels not included in the element pixel group are gradations between the designated gradation and the gradation of the background of the displayed symbol, and the distance calculated by the distance calculation unit (20) 15. The information processing apparatus (1) according to claim 14, wherein correction is performed to a gradation according to.
Display a symbol having a designated gradation and a designated line width in either the row direction or the column direction of the matrix on the display screen in which the pixels are arranged in a matrix based on the information indicating the skeleton of the symbol. It is an information processing method that
When a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is an element pixel group, which is a part of the pixel group constituting the display pixels of the symbol, Calculating the distance in the direction of the line width between the element line segment which is an element of the constituting skeleton line and the central point of the element pixel group including the display pixel overlapping the element line segment (S17, S21) When,
The gradation of the pixel at one end included in the element pixel group including the central point is the gradation between the gradation of the symbol and the gradation of the background of the symbol, and is calculated Correcting to a gradation according to the distance (S18, S22);
And (e.g., generating display data for displaying the symbol on the display screen based on the correction) (S33, S36, S46).
A program to be executed by an information processing apparatus provided with a display screen in which pixels are arranged in a matrix,
The program displays a symbol having a designated gradation and a designated line width in either the row direction or the column direction of the matrix on the display screen based on the information indicating the skeleton of the symbol ( Causing the information processing apparatus to execute S5);
The symbol is displayed when a pixel group corresponding to a line width in which the display pixels are arranged in a line in the direction of the line width is a part of the pixel group constituting the display pixel of the mark. The step (S5) of causing
Calculating a distance in the direction of the line width between an element line segment which is an element of the skeleton line constituting the skeleton and a central point of the element pixel group including the display pixel overlapping the element line segment (S17 , S21),
The gradation of the pixel at one end included in the element pixel group including the central point is the gradation between the gradation of the symbol and the gradation of the background of the symbol, and is calculated Correcting to a gradation according to the distance (S18, S22);
And generating display data for displaying the symbol on the display screen based on the correction (S33, S36, S46).