JP2589953B2 - Character and image data generation apparatus and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character / character display which reduces flicker (screen flicker) when displaying bitmap pattern data such as a character on a monitor scanned in an interlaced manner such as a home television. The present invention relates to an image data generation device.

[0002]

2. Description of the Related Art In recent years, research and development of multimedia equipment using a home television as an information terminal has been activated. In this case, it is necessary to present multimedia data such as characters, still images, and moving images on a television screen,
Among them, the display of characters is a basic function.

However, character display has been easily realized by a computer using a non-interlaced monitor, but high resolution character display has not been provided so far in a home television due to a problem of a scanning system. Did not.

[0004] This is because, in principle, in an interlaced system such as a home television, displaying an image having a drastic change in vertical luminance causes a flickering of the screen called flicker, giving a sense of discomfort to the viewer. is there. In particular, when displaying high-resolution characters, the display color (luminance) for each line
, The luminance in the vertical direction tends to be drastic.

This flicker is caused by interlaced scanning at 30 Hz per frame (field frequency is 60 Hz). If the scanning per frame is doubled to about 60 Hz, it will not be recognized by human eyes.
However, in order to realize this, non-interlaced scanning or double-density interlaced scanning in which the vertical frequency is doubled (120 Hz) must be performed. Is required, which leads to a significant increase in cost.

On the other hand, flicker can be reduced if the change in vertical luminance can be moderated even in interlaced scanning. This is apparent from the fact that flicker does not occur in a normal video signal. For this purpose, it is necessary to perform a vertical low-pass filter operation using a plurality of lines to suppress a change in luminance.

However, if this is carried out when reading the display memory data, a plurality of lines of buffer memory and its control circuit are required for data processing of one line, and the circuit scale is increased, and low-pass filter processing is performed on the entire screen. , A problem arises in that the image is slightly blurred.
Therefore, it is preferable that the processing for suppressing the change in the vertical luminance be limited to the character area portion from the viewpoint of image quality deterioration.

Japanese Patent Publication No. Hei 4-78230 discloses an example of a character area limited to such a character area portion. First, a peripheral portion of a character is determined at the time of drawing a character. Multi-gradation processing for inserting an intermediate color between two luminance levels is performed to reduce line flicker.

The operation will be described in detail with reference to FIG.
First, the data of the teletext program selected by the selection key 902 from the input teletext signal is stored in the character code buffer memory 903. This character code string is composed of a character code that specifies the type of character to be displayed, coloring data that specifies the color of the character to be displayed, and position data that indicates the position at which the character is to be displayed. The character code is sent to the character font ROM 904 to output character font dot pattern data (character font data) F1 representing the character type of the character type specified by the character code. The data is converted into data and written to the display memory 906. Display memory 90
6 is a CRT (display tube) for signals obtained by repeated reproduction
A text broadcast program is provided by displaying it at 907.

The processing procedure in the multi-tone processing 905 will be described with reference to FIG. 10. First, for the character font data F1, the illustrated aperture pattern (a) is used, and the center pixel is "1" of the F1 data. In the case of overlapping, all the surrounding eight pixels are replaced with "1" to obtain the data of the F2 pattern.
Similarly, an F3 pattern is obtained using the aperture pattern (b) for the F2 pattern. By ORing the patterns thus obtained, four regions are generated and converted into character data of four gradations of intermediate color 1 and intermediate color 2 in addition to the background color and foreground color.

Another conventional example is a process for displaying and reading a character pattern. There is a process for controlling a luminance level of a video signal of a scanning line adjacent to a video signal to be scanned (Japanese Patent Laid-Open No. 58-1983). No. 48583). This detects a luminance difference between a video signal to be scanned and a video signal of an adjacent scanning line, and when the luminance difference is equal to or larger than a predetermined value, controls the level of the adjacent video signal so that the luminance change becomes gentle. Things.

[0012]

However, FIG.
In order to scan the character font data with the aperture pattern shown in (1), it is necessary to process data for nine pixels around one pixel, and the processing speed will be at least eight times faster if the processing is performed sequentially. On the other hand, if all nine pixels are processed in parallel, the processing speed does not increase, but the circuit scale increases.

In addition, two aperture calculations are required to create the two types of patterns F2 and F3 in FIG. 10, and the F3 pattern is created using the F2 pattern after it is created. Further processing time is required.

In writing to the display memory 906, the size of the character to be drawn becomes larger due to the expansion of the peripheral portion by the aperture pattern (the F2 and F3 pattern portions in FIG. 10), which complicates the drawing process such as management of the space between characters. I do. That is, when generating character data to be drawn from the logical sum of the character font pattern and the pattern obtained by the character peripheral portion calculation aperture as in Japanese Patent Publication No. 4-78230, the character font size is always expanded. Becomes In addition, Japanese Patent Publication No. 4-7823
When Japanese Patent Publication No. 0 is applied to a small character font, the expanded peripheral portions overlap each other, and the displayed characters are difficult to see.

Similarly, a second conventional example of Japanese Patent Application Laid-Open No. 58-48
No. 583 also changes the video signal of a scanning line adjacent to the line to be scanned, so that the original symbol (character) is not distorted, but the upper and lower areas are changed and the symbol size is expanded as a symbol size. turn into. In particular, in the drawing process, the exceptional processing for the protruding area becomes a heavy burden and becomes a problem. Further, Japanese Unexamined Patent Publication No.
Japanese Patent Application Laid-Open No. 8-48583 describes processing at the time of raster scanning.
Requires high-speed processing at the video output rate
Becomes

In view of the above, the present invention provides a method for rendering binary data such as a character font on a multi-valued display memory.
Generates multi-gradation data by performing a low-pass filter operation in the vertical direction in the same area as the pattern size of the value data, and draws and displays this data to reduce flicker on an interlaced scanning television. It is another object of the present invention to provide a character / image data generation device that realizes high-resolution pattern data display in which a drawing area does not change. In this case, although the original data pattern is partially distorted, it can be visually reduced with less deterioration as described in the embodiment. Also, whether the process is for drawing in the display memory
Therefore, it is not necessary to perform high-speed processing as in the conventional method.
It can also be realized only by software .

[0017]

In order to achieve the above-mentioned object, binary pixel data composed of two-dimensional rows and columns is multi-layered.
Device for converting to binary data and displaying the binary pixel data.
Means for converting data to multi-gradation data,
A frame memory to be stored and the converted multi-tone data
Means for writing data to the frame memory;
For displaying multi-gradation data read from memory
And converts the binary pixel data into multi-gradation data.
Means for sequentially outputting bitmap pattern data of a predetermined row
Means for reading, and the bits of the read predetermined row
Map pattern data and at least one adjacent to the row
A multi-line pattern that stores bitmap pattern data for a line
Turn storage means and the bitmap pattern of the plurality of rows
Calculates data with a specified weight and corresponds to the specified row
Means for generating multi-gradation data to generate
Means for displaying the multi-gradation data,
The multi-level data read from the memory
Landscape, background color and at least one intermediate color
Means for associating a set of colors with the multi-tone data
Display of interlaced scanning system depending on the attached color
It is characterized by having means for displaying on a ray .

[0018]

[0019]

[0020]

[0021]

According to the present invention, when bitmap data such as a character is drawn by using the above-described structure, a halftone color is used by utilizing a vertical correlation from a pattern of a line to be drawn and a pattern of at least one of the upper and lower lines. By generating and drawing multi-gradation data including a pattern, it is possible to realize a pattern display in which the vertical luminance changes slowly.

Further, since the multi-gradation data is generated by performing the correlation operation in the vertical direction corresponding to the row within the range of the bitmap pattern to be drawn, the pattern data can be made the same size as the original pattern data.

[0023]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG.

FIG. 1 is a block diagram showing the internal configuration of the character / image data generating apparatus of the present invention. In the figure,
The main control means 1 controls the entire apparatus. The bitmap data storage means 2 stores binary pattern data, and is, for example, a character ROM. The multi-row pattern storage means 3 stores, for example, pattern data (P1, P2, P3) for three rows out of the pattern data of the bitmap data storage means 2. The multi-tone data generating means 4 generates one row of multi-tone data from an operation utilizing the correlation of the bit map pattern data of three rows. In this embodiment, the weight of the row data P2 to be generated is set to "2", the weight of the row data P3 immediately below and the weight of the row data P1 immediately above is set to "1", and the calculation is performed by (generation data) = P1 + 2 × P2 + P3 (1) I do. This is generally [1,
[2, 1] called low-pass filter operation. P
Since the data of 1 to P3 is 1 bit / pixel, the generated multi-gradation data is the data of 3 bits / pixel having a value of 0 to 4. The display memory unit 5 is a memory that draws data from the multi-tone data generation unit 4. The color map conversion means 6 converts display data read from the display memory means 5 into RGB digital color data. The D / A conversion means 7 converts the RGB digital color data into an analog video signal. It is something to convert.

In this embodiment, character data is assumed as bitmap data, and a method of displaying a character with reduced flicker will be described with reference to FIGS. 2, 3 and 4. FIG. First, the main control means 1 reads out three lines of character pattern data from the bitmap pattern storage means 2 and stores them in the multi-line pattern storage means 3 in order to draw predetermined character data in the display memory means 5. . At this time, if each line of characters is A line, B line, C line, etc. in order from the top,
The combination of the multi-line character patterns is a data group sequentially shifted as follows.

(1st line generated data) = low-pass filter operation (“0”, A,
B) (2nd line generated data) = low-pass filter operation (A, B,
C) (3rd line generated data) = Low-pass filter operation (B, C,
D) (4th line generated data) = low-pass filter operation (C, D,
E) Therefore, if the multi-row pattern storage means 3 has a function of sequentially shifting the stored row pattern data when writing a new row pattern (P2 → P3) ,
P1 → P2) For the second and subsequent lines, the pattern data for a plurality of lines required for processing is stored simply by sequentially setting the bitmap character pattern for one line, and the character pattern for three lines is stored every time. There is no need to set. That is, the drawing processing overhead can hardly occur.

In the first line of character data generation, since there is no character pattern above the first line (when the line size of the character pattern exceeds the line size), "0" is set as the default pattern in this embodiment. It shall be. Similarly, it is assumed that the lower line data that does not exist is set to “0” in the generation of the character data of the last line. The default pattern may be "1". Similarly, it does not have to be a fixed pattern as described above,
For example, the pattern data of the first row or the last row depending on the coordinate data pattern in the display memory means 5 may be set twice.

On the other hand, the processing on the first line and the last line is performed by expanding the original character font pattern in the vertical direction.
Equivalent to filling the extension with a specific pattern. That is, the bitmap pattern storage unit 2 has a function of expanding character font data (i × j pixels, j is a row direction) in a vertical direction with a specific pattern (i.
(J + 2) pixels). However, at this time, the display memory means 5
Is drawn in the original character font area (i.
× j pixels).

Assuming that the main control means 1 performs this series of processing in units of 8 bits per row, the data stored in the plural row pattern storage means 3 is as shown in FIG. 2A. . The processing size per row is not limited to 8 bits, but can be realized with an arbitrary bit width.
Further, this is not limited to the column size of the two-dimensional data composed of rows and columns.

The multi-tone data generating means 4 performs the low-pass filter operation shown in equation (1) in parallel for each bit (pixel) of the character pattern data for the three lines.
The multi-gradation (3-bit) character data of (b) is generated.
The main control means 1 draws the generated multi-gradation character data on the display memory means 5. In this case, the display memory means 5 has a memory configuration of at least 3 bits per pixel. Then, the data read out from the display memory means 5 is converted into RGB color data by the color map conversion means 6 and output to the monitor as an analog video signal by the D / A conversion means 7.

The conversion value of the color map conversion means 6 is previously set to "0" as shown in FIG.
The conversion value of “1” is set as the background color, the conversion value of “4” is set as the foreground color,
A value in which the conversion value of “.about.3” is associated with three intermediate colors is set. The conversion values to the three intermediate colors are obtained, for example, by taking the data of the display memory means 5 on the horizontal axis and the luminance level of the color data after color map conversion on the vertical axis as shown in FIG. Set the color of the intersections connecting the luminance levels with straight lines. Alternatively, an intermediate color may be obtained by connecting the luminance level of the background color and the foreground color not by a straight line but by a curve in consideration of gamma correction of the television monitor.

As a result, the character data which was conventionally displayed in two colors of the background color and the foreground color as shown in FIG. 4A is replaced with the intermediate color in the vertical outline portion as shown in FIG. 4B. Use
A display in which the luminance change in the vertical direction is moderated can be obtained. In addition, halftone characters as shown in FIG. 3B have the characteristic that they are visually uncomfortable due to the spatial frequency characteristics of the human visual system (low-pass type with low high-frequency sensitivity).
Also, the characters in FIG. 4B generated as multi-tone data have the same size as the original size in FIG.

As described above, as preprocessing of character drawing,
The low-pass filter operation is performed on the bitmap character pattern data to generate multi-gradation character data and display it by combining the background color, foreground color, and intermediate color. Character display can be realized. This enables character display with reduced flicker even on an interlaced scanning type monitor.

In the drawing process at this time, if the multi-row pattern storage means 3 is provided with a pattern data shift function, one row of pattern data is set for one row, except for the first row processing. Since character data can be obtained, processing overhead caused by using a plurality of lines can be almost eliminated. Further, since the character size does not change, no exception processing such as a change in the space between characters, which is a problem of the conventional device, occurs.

The low-pass filter operation represented by the equation (1) is a fixed operation result since the data to be operated is binary, and the operation result shown in FIG. 2 is used in advance as a table. Is also possible. For example, (P
1, P2, P3) can be realized by a conversion table or the like using each bit as an address. If this is used, a low-pass filter operation can be easily realized by a circuit such as a ROM. Further, if the low-pass filter operation is implemented using a conversion table, the multi-tone data generation processing in this embodiment can be realized at a practical speed using software.

On the other hand, the multi-gradation character data generated by the multi-gradation data generating means 4 is not generated every time.
It may be stored in a character ROM or the like. In this case, the character ROM size is three times as large as that of the bitmap data. However, the above-described low-pass filter arithmetic processing can be omitted, and high-speed processing can be performed without hardware support. Becomes

As for the method of low-pass filter operation, in this embodiment, [1, 1,
[2, 1], the low-pass filter has been described. However, the calculation may be performed by using a two-line character pattern or a four-line or more bitmap pattern and using other weighting factors (including decimal numbers). In that case, the generated multi-gradation character data is not limited to five gradations.

Similarly, not only the correlation in the vertical direction but also the correlation in the horizontal direction may be included. This is the case where a filter operation is performed on a two-dimensional block of N pixels × M pixels (N> 1, M> 1) per pixel. At this time,
The pattern data set in the multi-row pattern storage means 3 needs to be expanded at the upper, lower, left and right ends of the two-dimensional pattern. The arithmetic circuit may include a ROM table corresponding to N × M addresses. However, even at this time, the area to be drawn in the display memory means 5 is the original character font size.

Further, in the above embodiment, the generated multi-gradation data is written to the display memory as it is. However, if the display memory means 5 can store the multi-gradation data in a data format corresponding to the display color, the multi-gradation data generation is performed. Means 4 is provided with a color map conversion function, and the RG after the color map conversion is provided.
It may be generated as B data. In this case, the color map conversion means 6 is not always necessary.

(Embodiment 2) In Embodiment 1, since the character data drawn in the display memory is limited to the values (0 to 4) shown in FIG. 2, the character display using a plurality of background colors and foreground colors is performed. It is difficult to achieve. That is, since the conversion to the display color by the color map conversion means 6 is common to the entire normal screen, it is not possible to change the character color and display as shown in FIG.

Thus, in a second embodiment of the present invention, a character generating apparatus capable of displaying a plurality of character colors while reducing flicker will be described with reference to FIGS. In the second embodiment, components having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 5 is a block diagram showing the internal configuration of the character generation device of the present invention.

In the figure, a data conversion means 8 converts the data generated by the multi-tone data generation means 4 so as to assign a display color corresponding to each combination of a foreground color and a background color. In the present embodiment, as data conversion, background data of character data to be drawn is added as an offset.

The operation of the character display method according to the present embodiment will be described below with reference to FIGS. First, the main control unit 1 sends the predetermined character data to the display memory unit 5 by using the bitmap pattern storage unit 2.
The character data for the line is read out and stored in the multi-line pattern storage means 3.

The multi-tone data generating means 4 performs the low-pass filter operation shown in equation (1) for each bit (pixel) of the bit-mapped character data for the three lines, Generate gradation character data. The operation so far is the same as that of the first embodiment.

Next, the data conversion means 8 adds data corresponding to the background color of the character to be drawn as an offset to the generated multi-tone character data. For example, in FIG. 6, three types of background data (BG) of “0”, “5”, and “10” are added to multi-tone character data to convert them into the following three data groups.

(Background data = 0) → (character data = 0 to 4) (background data = 5) → (character data = 5)
9) (Background data = 10) → (Character data = 10-1)
4) The main control means 1 draws the converted multi-tone character data on the display memory means 5, controls the color map conversion means 6, and associates each group with a predetermined character color. In FIG. 6, (0-4) group → background color: “green”, foreground color:
“Red” (5-9) group → background color: “blue”, foreground color:
A group of “white” (10 to 14) → corresponding to a display color consisting of three kinds of background colors, foreground color: “orange” and foreground color: “purple”. Then, the D / A conversion means 7 outputs the converted R
The GB data is output to a monitor as an analog signal.

As described above, the character data converted into a plurality of groups by the data conversion means 8 is controlled by the color map conversion means 6 to specify the display color of the characters for each group, thereby reducing flicker. , It is possible to realize a plurality of character color displays as shown in FIG. The number of colors that can be displayed depends on the number of bits per pixel of the display memory means 5 (4 bits / pixel can correspond to the three groups shown in FIG. 6). If the number is increased, multi-color character display more than that of the present embodiment is also possible.

Further, in the present embodiment, the case where data corresponding to the background color of a character is added as an offset as the data conversion in the data converting means 8 has been described, but a conversion method for dividing a color map into a plurality of groups is described. if there is,
Other conversion methods using data or the like corresponding to the foreground color may be used.

In the above embodiment, the converted character data is drawn in the display memory, and the converted character data is drawn by the color map conversion means 6.
Has been described, but if the display memory means 5 can store the data in a data format (full color correspondence) corresponding to the display color, the data conversion means 8 is provided with a color map conversion function, and R
It may be generated as GB data. In this case, the color map conversion means 6 is not always necessary.

(Embodiment 3) When the display memory means 5 supports full color as described above, a predetermined character color is used instead of the low-pass filter operation for the bitmap character pattern data as in the first and second embodiments. A low-pass filter operation may be performed after color development into (background color and foreground color). FIG. 8 shows a block diagram in this case. In the third embodiment, components having the same functions as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 8, the color developing means 9 converts a bitmap character pattern into character data (two colors) of a predetermined background color and foreground color. The multi-line pattern storage means 10 stores character data of three lines after color development, and differs from FIG. 1 in the number of bits per pixel of the character data. For example, if the display memory means 5 has 24 bits per pixel (8 bits for each color), character data of 24 bits / pixel is stored.

The multi-tone data generating means 11 performs a low-pass filter operation represented by the equation (1) on the character data after the color development of three lines to generate character data in which a change in vertical luminance including an intermediate color is suppressed. FIG. 1 is different from FIG. 1 in that multivalued data after color development is calculated instead of calculation between bitmap character patterns.

The main control means 1 reads out character data from the bitmap pattern storage means 2 in order to draw predetermined character data on the display memory 5, and firstly reads out the color development means 9.
Is developed into character data of two colors of a predetermined background color and a foreground color. From the expanded color character data, data for three lines is read out, and the multi-line pattern storage means 10 is read out.
To be stored.

The multi-gradation data generating means 11 performs the low-pass filter processing shown in the equation (1) for each bit (pixel) of the character data for the three lines to obtain the vertical luminance variation including the intermediate color. Generates loose character data. Since the size of the low-pass filter operation processing in this case is large if the operation result is stored in the ROM, the low-pass filter operation processing may be configured by an operation circuit or the like based on Expression (1). The main control means 1 draws the generated character data on the display memory means 5 and the D / A conversion means 7
Output to the monitor as an analog video signal.

As described above, in the present embodiment, in a system having a full-color display memory, a color display process is performed first, and a low-pass filter operation is performed on the data to display characters with reduced flicker. Can be realized with any background color and foreground color. That is, characters of any color that is not limited to the color map size can be displayed with reduced vertical luminance change.

In the present embodiment, the multi-tone data generating means 11 has described the case where the low-pass filter operation of [1, 2, 1] is performed on the character data of three lines after color development. Alternatively, the calculation may be performed using character data of two lines or character data of four or more lines and using other weighting factors (including decimal numbers). Similarly, the calculation may include not only the correlation in the vertical direction but also the correlation in the horizontal direction.

In the above-described three embodiments, the case where character data is used as the bitmap pattern data has been described. However, the same effect can be obtained for monochrome image data such as facsimile data. That is, data received by facsimile is handled as two-dimensional information, and may be processed as one character pattern in the above-described embodiment. This makes it possible to display a facsimile image with reduced flicker on an interlaced scanning television while suppressing a change in vertical luminance from the correlation with the adjacent row. Further, the data area to be drawn on the display memory or the like can be realized without changing the size of the received two-dimensional image. As bitmap pattern data,
In addition, similar effects can be obtained with image data composed of two colors.

[0058]

As described above, according to the present invention,
As pre-processing of drawing, multi-tone data using the vertical correlation of bitmap patterns of multiple rows is generated and combined with color map conversion display, which can greatly increase the hardware scale as in the past. Without inviting, it is possible to display a pattern in which the change in vertical luminance due to the intermediate color is gradual, and it is possible to display high-resolution characters and facsimile images without flicker on a home television even with an inexpensive configuration (only software).

Further, since there is no change in the character / image size due to the multi-gradation processing, it can be easily realized without imposing a load on drawing software such as management of a space between characters. Further, in the character drawing, if the multi-gradation character data to be generated is provided in advance as a character memory, an arithmetic processing circuit for correlating a plurality of lines is not required, and a reduction in the character drawing speed due to the above operation can be suppressed. it can.

Further, by converting the generated multi-tone data in accordance with the display colors, it is possible to realize a character display using a plurality of background colors and foreground colors. It is also possible to use various color schemes.

Furthermore, not only pseudo color display using color map conversion, but also full color display, the same effect can be obtained by performing the same vertical correlation processing on character data once expanded into full color.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a character / image data generation device that generates multi-tone character data from a bitmap character pattern using vertical correlation according to a first embodiment.

FIG. 2 is a diagram showing multi-tone character data generated by performing a low-pass filter operation from a bitmap character pattern for three lines.

FIG. 3 is a diagram showing correspondence between generated multi-tone character data and displayed character colors;

FIG. 4 is a diagram showing an original character pattern and a character pattern displayed according to the present invention.

FIG. 5 is a block diagram illustrating a configuration of a character / image data generation device that realizes a plurality of character color displays.

FIG. 6 is a diagram showing correspondence between generation of multi-gradation character data, conversion to drawing data, and color map conversion to a display color in the second embodiment.

FIG. 7 is a diagram showing an example of a screen when a plurality of character colors are displayed.

FIG. 8 is a block diagram illustrating a configuration of a character / image data generating apparatus that displays characters of an arbitrary color using vertical correlation in full-color character data after color development according to a third embodiment.

FIG. 9 is a block diagram showing a configuration of a conventional text broadcast receiving apparatus that performs text display for reducing flicker.

FIG. 10 is a view for explaining a method of generating multi-tone character data in the teletext receiver of FIG. 9;

[Description of Signs] 1 Main control means 2 Bitmap pattern storage means 3 Multi-row pattern (binary) storage means 4 Multi-gradation data generation means (binary → multi-value) 5 Display memory means 6 Color map conversion means 7 D / A conversion means 8 Data conversion means 9 Color development means 10 Multi-row data (multi-value) storage means 11 Multi-tone data generation means (multi-value → multi-value)

Claims (6)

(57) [Claims] 1. A binary pixel data comprising two dimensions of rows and columns.
Data is converted into multi-tone data and displayed ,
Means for converting binary pixel data into multi-tone data;
A frame memory for storing tone data,
Means for writing multi-tone data to the frame memory;
The multi-tone data read from the frame memory is displayed.
Means for converting the binary pixel data into multi-tone data
Means for converting the bitmap pattern data of a predetermined row.
Means for sequentially reading the data,
The bitmap pattern data of the row and a small
Store at least one row of bitmap pattern data
A plurality of row pattern storage means,
Calculated with a predetermined weight to the
Multi-tone data generation to generate multi-tone data corresponding to the row of
And means for displaying the multi-tone data,
The multi-tone data read from the frame memory
The predetermined foreground color, background color and at least one or more intermediate
Means for associating with a color set consisting of colors,
Data interlaced scanning method
Means for displaying on a display of
Character / image data generator . 2. Associating multi-tone data with a predetermined color set
2. The apparatus according to claim 1 , further comprising means for converting the multi-gradation data so that a predetermined set of colors is regarded as one group and display colors are assigned to each group. Character / image data generation device. 3. A binary pixel data comprising two dimensions of rows and columns.
Data is converted into multi-tone data and displayed ,
Means for converting binary pixel data into multi-tone data;
A frame memory for storing tone data,
Means for writing multi-tone data to the frame memory;
The multi-tone data read from the frame memory is displayed.
Means for converting the binary pixel data into multi-gradation data,
The binary pixel data is used to represent predetermined foreground and background colors.
Means for associating color data with
Regarding data, color data of a predetermined row and adjacent to the row
A multi-line pattern that stores at least one line of color data
Storage means, a constant weighting Tokoro the color data of said plurality of rows
By calculating, the background color, foreground color, and
Multi-color data containing at least one or more intermediate color data
Generating means for displaying the multi-gradation data.
The stage is interlaced scanning by said generated multicolor
Characterized by having means for displaying on an expression type display.
Text and image data generating device for. 4. A binary pixel data comprising two dimensions of rows and columns.
Data is converted to multi-tone data and displayed.
Converting binary pixel data to multi-tone data;
Write the converted multi-tone data to the frame memory
And reading the data read from the frame memory.
Displaying grayscale data, wherein the binary pixel data is displayed.
The step of converting the data into multi-level data
Step of reading bitmap pattern data sequentially
And the read bitmap pattern of the predetermined row
Data and the bit map of at least one row adjacent to said row.
Multi-line pattern storage step for storing
And the bitmap pattern data of the plurality of rows.
Multi-gradation corresponding to the predetermined row by calculating with a constant weight
Multi-tone data generation step of generating data,
The step of displaying the multi-gradation data includes the step of:
The multi-tone data read from the memory is stored in a predetermined foreground.
Consists of a color, a background color and at least one intermediate color
Associating with a color set,
The interlaced scanning display is
A sentence having a step of displaying in play
Character / image data generation method . 5. Associating multi-tone data with a predetermined color set
A predetermined color set as one group
The multi-tone data so that display colors are assigned to each group
Converting the data.
4. A method for generating character / image data according to item 4 . 6. A binary pixel data comprising two dimensions of rows and columns.
Data is converted to multi-tone data and displayed.
Converting binary pixel data to multi-tone data;
Write the converted multi-tone data to the frame memory
And reading the data read from the frame memory.
Displaying grayscale data, wherein the binary pixel data is displayed.
Converting the data into multi-tone data,
Color data representing a predetermined foreground and background color of the original data
And the associated color data
The color data of a given row and at least
A multi-line pattern memory for storing both color data for one line
And a predetermined weighting of the color data of the plurality of rows.
The background color and foreground color corresponding to the predetermined row
Generate multi-color data containing at least one or more intermediate color data
And a step of forming, the step of displaying said multi-tone data, the generated
Multi-color display for interlaced scanning
Characters / images having a displaying step
Data generation method .