JPH0673074B2 - Dot configuration character display conversion method - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a communication system for transmitting character and graphic information, and more particularly to character and graphic information conversion such as information conversion from the CEPT method to the CAPTAIN method described in detail below. The present invention relates to a character / graphic information conversion method between systems having different graphic expressions.

(Prior Art and Problems Thereof) In recent years, a transmission system of character and graphic information called a videotex has been put into practical use in each country. However, the display methods of character and graphic information adopted by each country are different from each other. For example, the European Postal and Telecommunications Administration Conference (CEPT) recommends using a predetermined font for letters and expressing and transmitting by using a mosaic for figures that are not in it. Commercialized Prestel (PRESTEL) that serially processes information and its attributes (color information, information whether it is text or mosaic, etc.), and in France, it processes information and its attributes in parallel. (TELETEL) is commercialized. This 2
The two methods are collectively called the CEPT method. on the other hand,
In Japan, a captain (CAPTAIN), which is a photographic method that expresses characters and figures in dot units.
Has been standardized. In North America, naplups (NAPLPS) based on graphics are standardized.

These CEPT, CAPTAIN and NAPLPS are called Videotex's three world standard systems.

Under such circumstances, even a CAPTAIN user in Japan, for example, needs a display terminal device for CEPT to use CEPT. However, in either case, if information is converted from CEPT to CAPTAIN at a place such as a videotex center, the CAPTAIN user owns the CAPTAIN.
It is possible to use CEPT on the terminal device. For this reason, information conversion technology between different systems is important.

An information conversion technique from the CEPT system to the CAPTAIN system related to the present invention will be described below.

The CAPTAIN method has a smaller number of characters that can be stored in one screen than the CEPT method. Therefore, in order to convert the display of the CEPT system screen, 6 characters of the CEPT system displayed with 6 × 10 dots will be displayed.
The number of characters is increased by converting the degree into a character of × 8 dots. The CEPT method uses one character of 6 × 10 dots as a coloring unit, while the CAPTAIN method uses 4 × 4 dots as a coloring unit, and within 4 × 4 dots, only two colors, the foreground color and the background color, are displayed. I can't. Therefore, when trying to faithfully reproduce the color change of the original image of the CEPT method that is colored in units of 6 × 10 dots by the CAPTAIN method, it is necessary to display three or more colors in the unit of coloring of 4 × 4 dots. There is a color conversion error.

Therefore, conventionally, as a means for reducing the color conversion error, 1) the original picture of Prestel is decomposed into 4 × 4 dot coloring units of the captain.

2) Continue to determine C1, C2, C3 ... in descending order of color area within the 4 x 4 dot coloring unit.

3) Next, priority is given to two colors having a large area, and the third and subsequent colors, C3 and C1, are replaced with C1 or C2.

I was performing such an action.

Even with such a simple method, the Prestel figure is originally a rough figure. Since the control code for changing the character color is also counted as one character, the color changes between one character and the next. The average image quality after conversion was almost satisfied because there was always a space of the same color as the background color of the previous character.

However, the above is the case of PRESTEL in which the character information and the control code (code for displaying the attribute) are serially processed in the CEPT system, and in the case of TELETEL, the character information and the control code are 1 by separating and processing in parallel
Coloring can be changed in units of character information. The following drawbacks occur when such information is targeted.

FIG. 1 shows a case where the character A and a space having a color different from the background color of the character A are received. The 6 × 10 dot TELETEL character string is first converted to the order of 6 × 8 as shown in FIG.
It becomes a character string of dots. This screen is decomposed into coloring units of 4 × 4 dots as shown in FIG. Moreover, the coloring units having three or more colors are determined to be two colors C1, C2, and C3 having a large color area, as shown in FIG. Next, priority is given to the two colors C1 and C2 having the largest area, and C3 is replaced with C1 or C2. In FIG. 6D, C3 is replaced with C2, and information is lost in this coloring unit. Figure (e) shows C3
Is replaced with C1. In this case, the character A is blurred.

(Objects and Features of the Invention) The present invention solves the above-mentioned problems and provides a dot configuration character display conversion method capable of converting information from a CEPT method to a CAPTAIN method while preventing only information loss and characters. It is a thing.

To achieve this object, the method of the present invention is arranged so that a character / graphic display terminal device using a specific dot constituent character is adjacent to a character / graphic display terminal device when displaying character information of another kind of dot constituent having a different degree.
If a character is a processing unit and the attributes of these two characters are the same, each character is replaced with a 6x8 dot character prepared in advance, and if the attributes of these two characters are different, a 8x8 prepared in advance. It is characterized in that it is reconstructed with dot characters and 4 × 8 dot characters.

That is, while the above-mentioned conventional technique converts the order of the decoded character string and performs the coloring process in units of 4 × 4 dots, the present invention prepares two characters of the decoded character string in advance according to the attribute. In principle, three types of character fonts are used for reconstruction to perform order conversion and coloring.

(Structure and Action of the Present Invention) The present invention will be described in detail below.

As described above, the character information in the CEPT system has a 6 × 10 dot structure, and the coloring processing unit in the CAPTAIN system is 4 × 4 dots. Therefore, in the horizontal direction, the processing unit is 12 dots, which is the least common multiple of 6 and 4, and is a multiple of 8 dots in the vertical direction, which is 12 × 8 dots. The horizontal 12 dots correspond to two CEPT characters, so it is sufficient to process every two characters. First, the attributes of two characters, that is, the foreground color (character color) and the background color are compared. If these are the same, the order of the two characters is converted into a character of 6 × 8 dots. 12x converted by this
Even if the area of 8 dots is divided into small areas of 4 × 4 dots, three colors are not included in the small area. On the other hand, 2
When the foreground color and the background color are different between characters, the two characters are composed of 8 × 8 dot characters and 4 × 8 dot characters. Even if the 12 × 8 dot area thus converted is divided into 4 × 4 dot small areas in the same manner as described above, three colors do not enter the small area.

The above processing procedure is summarized as follows.

Step 1) Decode the received CEPT method code.

Step 2) After the decrypted CEPT character (6 × 10 dots), check the character attribute in units of two characters.

Step 3) If the two characters have the same attribute, reconstruct them with 6 × 8 dot characters to make the CEPT screen correspond to the CAPTAIN screen.

Step 4) If neither of the two characters has the same attribute, reconstruct them with 8 × 8 dot characters and 4 × 8 dot characters to make the CEPT screen correspond to the CAPTAIN screen.

Step 5) The screen corresponding to the CAPTAIN method is decomposed into 4 × 4 dot coloring units and encoded by the CAPTAIN method code.

Example 1 One example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention, in which 1 is an input unit, 2 is a CEPT system decoding unit, 3 is a character / graphic degree conversion unit, 4 is a dictionary unit, 5 is a block division unit, and 6 is a block diagram. Is a code output unit for CAPTAIN. The received CEPT signal is applied from the input unit 1 to the CEPT system decoding unit 2 where it is decoded into a 6 × 10 dot character string. If the decoded code is a code indicating the end of the screen, the decoded output is CAPTAINed by the switch 21.
If the code is not applied to the reference code output unit 6 and indicates the end of the screen, the character / graphic degree conversion unit 3 executes the steps 2 to 4 described above.
Reconstruct the characters by following the procedure in. The 6 × 8, 8 × 8, 4 × 8 dot characters required for this reconstruction are constructed by referring to the dictionary unit 4. The dictionary unit 4 stores the character fonts shown in FIGS. 3 (a) and 3 (b). FIG. 3 (a) shows 6
Place a column of space before or after the character font required to form a x8 or 8x8 dot character, and a line of space below to form a 6x8 dot character. Characters of 8 × 8 dots are formed by arranging two columns, one column after or one column before and two columns after and one line below. Also, FIG. 3 (b) shows a character font for composing a character of 4 × 8 dots.
It consists of a line of dots. This 4x8 dot character font has no spaces before and after, but 6x8
Or because it is used in combination with 8x8 dot characters,
There is no problem on the display. Reconstruction of these characters is performed by the character / graphic order conversion unit 3. That is, the character / graphic degree conversion unit 3
Checks the matching of attributes between two characters, determines the character font to be used, sends the character font corresponding to the character type from the dictionary unit 4, adds the necessary space to the font, and adds the input character It works as if it were replaced with information.
The degree-converted character / graphic information is divided into blocks of 4 × 4 dots by the block division unit 5, and each block is encoded by the CAPTAIN code output unit 6.

An example of characters converted by the above operation is shown in FIG. 4 in comparison with the conventional example. FIG. 6A is an ideal conversion character string when it is assumed that the CAPTAIN method can color in 1 dot units. FIG. 2B is an example of the conversion character according to the above-mentioned conventional technique. The same (c) and (d) are the conversion character strings according to the present embodiment, and the difference between (c) and (d) is the difference in the placement of spaces. As can be seen from FIG. 4, according to this embodiment, a great improvement is obtained as compared with the conventional example (b), and it is close to the ideal type (a).

A flow chart of this embodiment is shown in FIG.

(Example 2) In the above-described example, the two-letter attributes do not match,
When constructing a 12x8 dot area, the first character is 8x
It was configured to be composed of 8 dots and the second character to be composed of 4 × 8 dots. However, depending on the character, 4 × 8
If it is composed of dots, readability may decrease. For example, as shown in FIG. 6A, although the word "Seem" has been processed, it is difficult to determine whether it is "Seem" or "Seen".

The present embodiment is intended to solve such a defect, and among the characters to be handled in advance, characters that are difficult to discriminate with a 4 × 8 dot configuration (for example, m, u, v, w, M, U). , V, #,%, etc.) is classified as a non-4 × 8 dot character group and 4 ×
When the character to be reconstructed with 8 dots belongs to the non-4 × 8 dot character group, the character is configured with 8 × 8 dots, and the other character is configured with 4 × 8 dots. .

The character string "Seem" processed by this embodiment is shown in FIG. 6 (b).
Shown in. Further, a flow chart of this embodiment is shown in FIG.

(Effect of the Invention) According to the present invention, by the above operation, the screen for the CEPT system can be displayed on the terminal for the CAPTAIN system, and the readability of the character information in that case is improved and the conversion image quality is improved. A significant improvement effect can be obtained as compared with the above method.

[Brief description of drawings]

1 (a), (b), (c), (d), and (e) are pattern diagrams for explaining the operation of the conventional system, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. (a) and (b) are schematic diagrams showing examples of fonts used in the present invention, and FIGS. 4 (a) and (b).
(C) and (d) are pattern diagrams for explaining the operation examples of the conventional method and the present invention method in comparison, FIGS. 5 and 7 are operation flowcharts showing the operation example of the present invention method, and FIG. (A) and (b) are pattern diagrams for comparing and explaining other operation examples of the conventional method and the present invention method.

Claims (1)

[Claims] 1. A dot constituent character display conversion method for converting a first dot constituent character having a processing unit of 6 × 10 dots into a second dot constituent character having a processing unit of 4 × 4 dots, in a 4 × 4 character display conversion method. The first dot constituent character is determined for every two characters as a processing unit of 12 × 8 dots, which is a multiple of the dot, and if the coincidence is judged, a 6 × 8 dot constituent character prepared in advance is determined. If the characters are replaced with each other or if it is determined that they do not match, a combination of the 8 × 8 dot constituent character and the 4 × 8 dot constituent character is used to combine the first dot constituent character 2 with the 12 × 8 dot processing unit. A dot constituent character display conversion method, wherein a character corresponding to a character is reconstructed and the reconstructed character is made to correspond to the second dot constituent character.