JP5197917B2 - Data display device and data display method - Google Patents

Description

  The present invention relates to a data display device and a data display method applicable as a display device of an electronic apparatus such as a mobile phone or a personal computer (PC).

  Generally, in a cellular phone, a personal computer (PC), and the like, an image, characters of a predetermined font, and the like can be displayed on a color display device including a liquid crystal display device (LCD).

By the way, a font composed of vector information such as a scalable font may output characters with a multi-tone color instead of a single color.
This is because anti-aliasing processing is performed to make the curved line of the character appear as smooth as possible, and an intermediate color is added between the character color and the background color.
In the calculation of the intermediate color, a color that is an intermediate color is calculated from a dot that outputs characters and a dot that is the background of the character.

FIG. 1 is a diagram illustrating a configuration example of a general display processing system.
The display processing system 1 in FIG. 1 has a ROM area 2 for storing font vector data DT1, and a RAM area 3 including a character drawing buffer 3A, a background drawing buffer 3B, and an output buffer 3C.

  As described above, the display processing system 1 has the buffer 3A for drawing characters and the buffer 3B for drawing the background separately, and realizes superimposition processing for screen display such as change of character color. doing.

When the data display device having such a display processing system is mounted on a small electronic device such as a mobile phone, the buffer 3A for drawing characters and the buffer 3B for drawing the background are separately provided due to the following restrictions. I can't have it.
1) Since the memory capacity is limited, the capacity of two buffers cannot be secured.
2) It is necessary to perform an overlay process every time it is displayed, and the display speed becomes slow.
3) An image may be drawn above (screen) above a buffer for drawing characters.

  For this reason, in a small electronic device such as a cellular phone, a single buffer in which a background image and characters are superimposed is formed to realize display processing.

The anti-aliasing process is disclosed in, for example, Patent Document 1.
JP-A-4-188192

However, the conventionally proposed data display apparatus has the following disadvantages.
When you want to change the color of the character that has been output once, when you try to draw the same character again at the same dot position, since the character is drawn as the background, the second and subsequent font output Therefore, a new intermediate color is calculated from the new character color and the background including the previous character color and the intermediate color of the previous anti-aliasing process.
For this reason, the value becomes darker than the value of the intermediate color that should be originally calculated, and as a result, the character becomes thick.

FIG. 2 is a diagram illustrating an output result when the character “a” is drawn twice on a white background in a general data display device.
As can be seen from FIG. 2, in the conventional data display device, when the same character is drawn again at the same dot position, there is a disadvantage that the character is displayed thicker.

  An object of the present invention is to provide a data display device and a data display method that can accurately obtain an intermediate color that should be originally calculated, and that can prevent the gradation portion of the font from becoming dark when drawing the font repeatedly. It is to provide.

A first aspect of the present invention is a data expansion means for expanding target data into a bitmap area by a bitmap method based on arrangement information and color information, and a background color detection means for detecting a background color of the bitmap area, Anti-aliasing processing means for performing anti-aliasing processing of the target data using an intermediate color calculated based on the color of the target data and the background color detected by the background color detection means; and the target data is subjected to the anti-aliasing processing . Display means for displaying processing data, wherein the target data includes first target data and second target data different from the first target data, and the background color detection means , in a state in which the first target data the antialiased processed data is developed in the bitmap area, before From the region where the first target data excluding the arrangement region of the processing data to which the second target data is antialiased of the bitmap area the antialiased processed data is expanded, the second The background color used for anti-aliasing processing of the target data is detected.

Preferably, the background color detection means detects the background color used for the anti-aliasing processing of the second target data, excluding the arrangement area of the second target data.

  Preferably, the background color detection means calculates a color that is an average of the background colors in the target bitmap area, and detects the average color as a background color.

Preferably, the background color detection means detects a background color in the same region as an uncolored region when the target data is expanded into a gray scale bitmap region.

A data display method according to a second aspect of the present invention is a data display method when processing data obtained by anti-aliasing processing of first target data is expanded in a bitmap area, and is based on arrangement information and color information. The first target data is expanded into a bitmap area by a bitmap method, and a processing data arrangement area in which second target data different from the first target data in the bitmap area is anti-aliased is excluded. A background color used for anti-aliasing processing of the second target data is detected from the region, and the second color is calculated using an intermediate color calculated based on the color of the second target data and the detected background color . The target data is anti-aliased, and the second target data is displayed as the anti-aliased process data.

  According to the present invention, there is an advantage that an intermediate color to be originally calculated can be accurately obtained, and when the font is repeatedly drawn, it is possible to prevent the color of the gradation portion of the font from becoming dark.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 3 is a block diagram illustrating a configuration example of the data display device according to the embodiment of the present invention.

  As shown in FIG. 3, the data processing apparatus 10 has a display unit 11, a storage unit 12, an operation unit 13, and a control unit 14 as main components.

  The display unit 11 is configured by, for example, an LCD (Liquid Crystal Display), and displays characters, symbols, images, and the like of a predetermined font in color under the control of the control unit 14.

The storage unit 12 includes a ROM and a RAM, and stores a program executed by the control unit 14, data used in processing of the control unit 14, data that needs to be temporarily stored, and the like.
In addition, the storage unit 12 stores font vector data, which is character information, a processing program corresponding to a bitmap system, bit position information, and the like.
The storage unit 12 is accessed by the control unit 14.

The operation unit 13 includes keys for selecting and executing various functions, and is configured to input kana, kana, kanji, alphabets, and other various symbols.
Information input by the operation unit 13 is input to the control unit 14.

The control unit 14 includes a microcomputer that performs processing for display and the like based on a program stored in the storage unit 12, and performs various processes related to the overall operation of the data display device 10.
For example, as shown in FIG. 4, the control unit 14 can draw a background image BGI to be synthesized in advance in a font output buffer as shown in FIG. 4, and the background image BGI For example, it has a function of outputting characters.
The controller 14 has a function of performing internal expansion processing from vector data to bitmap data before outputting the character to the background image, and excluding the dot position where the character is output from the calculation target of the intermediate color.
More specifically, as shown in FIG. 5, the control unit 14 converts the vector data DT21 stored in the ROM area 21 as bitmap data of multi-grayscale gray scale (gray density 0% to 100%). A function that first develops in the work buffer 221 in the RAM area 22 and calculates a color that is an average of the background colors for the dots of the background image to which characters in the output buffer 222 are not output while referring to the work buffer 221 Have
The control unit 14 has a function of performing coloring by calculating an intermediate color from the font character color and the calculated background average color for each dot of the development destination buffer 221.
Further, the control unit 14 has a function of performing anti-aliasing processing using the calculated intermediate color and displaying display target data such as characters subjected to anti-aliasing processing on the display unit 11.

  The control unit 14 of the present embodiment includes a data development unit 141, a background color detection unit 142, and an anti-aliasing processing unit 143 as shown in FIG.

  The data expansion unit 141 expands the target data into the bitmap area by the bitmap method based on the arrangement information and color information of the target data (for example, characters) to be displayed.

The background color detection unit 142 detects the background color of the bitmap area.
At this time, the background color detection unit 142 develops the data in the data development unit 141 when the data is developed (drawn) at the same position in the bitmap region while the data is developed (drawn) in the bitmap region. The background color in the bitmap area excluding the data arrangement area is detected.
More specifically, the background color detection unit 142 is a bitmap region excluding the data arrangement region developed by the data development unit 141 and the region to which the intermediate color is given by the antialiasing processing by the antialiasing processing unit 143. Detect background color at.
The background color detection unit 142 calculates an average color of the background colors in the target bitmap area, and detects this average color as the background color.
Then, the background color detection unit 142 detects the background color of the same area as the area that is not colored when the data is expanded into the gray scale bitmap area.

The anti-aliasing processing unit 143 performs anti-aliasing processing using an intermediate color calculated based on the color of the target data expanded into the bitmap area and the background color of the bitmap area detected by the background color detection unit 142.
The data subjected to the anti-aliasing process is displayed on the display unit 11.

Next, the operation of the control unit 14 configured as described above will be described with reference to FIGS.
FIG. 6 is a flowchart for explaining the operation of the control unit 14, FIG. 7 is an image diagram developed in gray scale, and FIG. 8 is an image diagram of an output buffer in which a character color is set to, for example, red and an intermediate color is colored. is there.
Here, as an example, a case where the vector data of the character “A” is expanded into bitmap data will be described.

  For example, as shown in FIG. 4, the control unit 14 draws a background image BGI to be combined in advance in a font output buffer, as shown in FIG.

First, in step ST1, the control unit 14 causes the data development unit 141 to convert the vector data stored in the ROM area 21 of FIG. 5 into a multi-grayscale gray scale (gray density 0% to 100%) bitmap. The data is primarily expanded in the work buffer 221 in the RAM area 22 as data.
In this processing of step ST1, the gray scale development image developed in the work buffer 221 is as shown in FIG.
At this time, the gray density is changed according to the density of the character color to be output.

Next, in step ST2, the background color detection unit 142 refers to the work buffer 221 and uses a color that is an average of the background colors (background average color) for the dots of the background image to which characters in the output buffer 222 are not output. ) Is calculated.
In step ST2, an average color is calculated for the dots of the background image corresponding to the dots (white portions) DTW from which characters in FIG. 7 are not output.

Next, in step ST3, the anti-aliasing processing unit 143 performs coloring by calculating an intermediate color from the character color of the font and the calculated background average color for each dot of the development destination buffer 221.
In this step ST3, when outputting the character color in red, for example, the intermediate color is calculated from the background average color calculated by the background color detection unit 142 and the gray density of the character in step ST2, and is output to the dots of the output buffer 222.
The output image is as shown in FIG.

  And it displays on the display part 11 in step ST4.

  If the character “A” is to be drawn again at the same position by the above processing, steps ST1 to ST3 are performed in the same manner, but the color to be added to the intermediate color portion does not depend on the dot to which the character is output. The same color can be applied.

  If it is desired to change the already displayed character to a different color, it is possible to draw a character of a different color by redrawing only the character without rewriting the background image data.

  As described above, according to the present embodiment, the data development unit 141 that develops the target data into the bitmap area by the bitmap method based on the arrangement information and color information of the target data (for example, characters) to be displayed; When the data is expanded to the same position in the bitmap area while the data is expanded in the bitmap area, the background color in the bitmap area excluding the data arrangement area expanded in the data expansion unit 141 is set. Anti-aliasing processing is performed using the background color detection unit 142 to detect, and the intermediate color calculated based on the color of the target data expanded to the bitmap area and the background color of the bitmap area detected by the background color detection unit 142 Since the anti-aliasing processing unit 143 is provided, the following effects can be obtained.

That is, before outputting the font to the output buffer, the vector data can be expanded to skip the dots where the character color is output from the calculation target of the intermediate color. As a result, the intermediate color can be made constant. .
In this way, by always performing the skip process, it is possible to draw a character without distinguishing between the first drawing and the second and subsequent drawing processes.

  The data display device 10 having such characteristics can be applied to a color display device such as a liquid crystal display device (LCD) in a mobile phone, a personal computer (PC), etc., and displays images, characters of a predetermined font, and the like. It is possible.

FIG. 9 is a diagram illustrating an example of the appearance of a mobile phone, which is a small electronic device that can employ the data display device according to the present embodiment.
9, the display unit 11 of the data display device 10 of FIG. 3 is applied as the display unit 101, and the operation unit 13 is applied as the operation unit 102 including a numeric keypad.
The storage unit 12 and the control unit 14 are mounted on a circuit board (not shown) inside the mobile phone 10.
In this case, in addition to the above-described data display function, the control unit 14 has a processing function related to the telephone, for example, a call processing / incoming sequence in a communication processing unit (not shown) according to a key input operation in the operation unit 13. It is also possible to have a processing function for controlling the above, a processing function for transmitting and receiving voice data input in a voice processing unit (not shown), etc.

  In a small electronic device such as a cellular phone, a single buffer in which a background image and characters are superimposed is formed to realize anti-aliasing processing. However, in an electronic device equipped with the data display device 10, There is an advantage that an intermediate color to be calculated can be accurately obtained, and when the font is drawn repeatedly, it is possible to prevent the gradation portion of the font from becoming darker. Therefore, the display character does not become thick.

It is a figure which shows the structural example of a general display processing system. It is a figure which shows the output result when the character "a" is drawn twice on a white background in a general data display device. It is a block diagram which shows the structural example of the data display apparatus which concerns on embodiment of this invention. It is an image figure of the buffer for output used as the output destination of a font. It is a figure which shows notionally the predetermined step of the display data of this embodiment. It is a flowchart for demonstrating operation | movement of the control part of this embodiment. It is the image figure developed in gray scale. FIG. 8 is an image diagram of an output buffer in which the character color is red, for example, and intermediate colors are applied. It is a figure which shows an example of the external appearance of the mobile telephone which is a small electronic device which can employ | adopt the data display apparatus which concerns on this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Data display apparatus, 11 ... Display part, 12 ... Memory | storage part, 13 ... Operation part, 14 ... Control part, 141 ... Data expansion part, 142 ... Background color Detection unit, 143... Anti-aliasing processing unit.

Claims (5)

A data expansion means for expanding the target data into a bitmap area by a bitmap method based on the arrangement information and the color information;
Background color detection means for detecting a background color of the bitmap area;
Anti-aliasing processing means for performing anti-aliasing processing of the target data using an intermediate color calculated based on the color of the target data and the background color detected by the background color detection means ;
Display means for displaying the processing data on which the target data has undergone the anti-aliasing processing,
The target data includes first target data and second target data different from the first target data,
The background color detection means, in a state in which the first target data the antialiased processed data is developed in the bit map area, the first target data the antialiased processed data deployment The background color used for antialiasing processing of the second target data is detected from an area other than the processing data arrangement area where the second target data is antialiased among the bitmap area being processed.
Data display device. The data display apparatus according to claim 1, wherein the background color detection unit detects a background color used for anti-aliasing processing of the second target data, excluding an arrangement region of the second target data. The data display device according to claim 1, wherein the background color detection unit calculates a color that is an average of background colors in the target bitmap area, and detects the average color as a background color. 4. The data display device according to claim 1, wherein the background color detection unit detects a background color in the same region as an uncolored region when the target data is expanded into a grayscale bitmap region. 5. A data display method when processing data obtained by anti-aliasing the first target data is expanded in a bitmap area,
Based on the arrangement information and the color information, the first target data is expanded into a bitmap area by a bitmap method,
A background color used for anti-aliasing processing of the second target data from an area excluding the processing data arrangement area where the second target data different from the first target data is anti-aliased in the bitmap area. Detect
Performing anti-aliasing processing of the second target data using an intermediate color calculated based on the color of the second target data and the detected background color;
The data display method, wherein the second target data is displayed as the anti-aliased processed data.