JPH04174899A - Dot character pattern expanding device - Google Patents

Abstract

PURPOSE:To expand a character pattern relatively simply and in a small memory capacity by carrying out a correction of the slanting line part of the character pattern in the expansion process by shifting a part of the output data of the character pattern. CONSTITUTION:A three-row memory 2 memorizes the part for continuous three rows from a character pattern memory 1 by slipping. Then, a slanting line detector 3 stores six sorts requiring an interpolation, of four-dot patterns, inputs the first two rows from the memory 2, compares them with the six sorts of patterns for each four dots, and when they are coincident, a flag corresponding to the detecting flag is set. And a noninterpolation detector 4 does not set the flag when the pattern including four dots to be the comparing object are coincident with a specific pattern. And a converting circuit 7 inputs each one row from a buffer memory 8 and the memory 2, and expands them, and at the same time, shifts the data corresponding to the flag, and stores in the memory 8. Consequently, an interpolation can be carried out simply and with a small memory capacity.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dot character pattern enlarging device, and particularly to a dot character pattern enlarging device that interpolates diagonally shaded portions when enlarging a dot matrix character pattern used for output/display in computer systems, etc. The present invention relates to an enlarged dot character interpolation device.

[Prior Art] In a dot matrix character pattern used for output/display in computer systems, the matrix size of the character pattern is set based on the output/display font size. A square size of range is often used. To output and display characters of various sizes, it is necessary to have character patterns of many matrix sizes, but there are limitations in terms of memory capacity and system functionality. Generally, the basic pattern is enlarged and used.

However, if you simply double or triple the basic matrix size,
When enlarged to 4 times, etc., the quality of characters deteriorates. In particular, since the jaggedness of diagonal lines becomes noticeable, various interpolation methods have been proposed for the purpose of improving diagonal lines.

The conventional interpolation method is as shown in FIG. 8: During the second expansion, a pattern of 5×5 dots in the surrounding area is searched, and 32. This is a method that performs the S3 judgment and replaces it with a pre-stored enlarged pattern (Tokuko Sho 6).
-58037).

[Problems to be Solved by the Invention] The conventional interpolation method described above is a method in which the enlarged part pattern is stored in advance or a method in which the enlarged part pattern is generated by assembling the enlarged part pattern using a logic circuit. , 4 times, etc., each having a different enlargement size, which has the disadvantage of increasing the memory capacity and complicating the circuit. In addition, there is the problem that simply replacing a stored partial pattern can cause inconvenience, and to prevent this, some methods combine logic that recognizes the pattern and does not perform interpolation, but the detection for recognition is difficult. It's quite complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dot character pattern enlarging device which simplifies pattern 5.3 recognition and has a small memory capacity in order to improve the jaggedness of diagonally lined portions when enlarging a character pattern.

[Means for Solving the Problems] The dot character pattern enlarging device of the present invention has three consecutive dot character pattern data read from a dot character pattern storage section storing dot character pattern data.
A three-column memory that stores data by shifting the columns by one column, and a
The first bit position provided corresponding to each bit position of the dots in the column.
The second detection flag and six types of patterns that require interpolation among the 2×2 4-dot patterns are stored in advance, and the first and second column data of the data stored in the three-column memory are stored in advance. For the eye data, 4 dots of 2×2 are sequentially compared with the six types of patterns mentioned above, and when a match is found with any of the patterns, the direction of the dot to be interpolated is determined from the pattern and the dot on the right side of the dot is interpolated. A diagonal line detection unit that sets a flag for the bit position of the dot in the first detection flag if the dot is interpolated, and a flag for the bit position of the dot in the second detection flag if the dot on the left side is to be interpolated; When the dot pattern consisting of 9 dots of 3 x 3 including the 4 dots to be compared by the detection unit matches a predetermined pattern, the first detection flag or the second detection flag of the bit of the dot is not set. sequentially from the non-interpolation detector, buffer memory, and three-column memory,
Input the dot data in the first column, enlarge the dot data according to the enlargement magnification, and
Alternatively, it has a switching circuit that shifts the dot data corresponding to the second detection flag to the right or to the left and stores it in the buffer memory.

[Operation] Since correction of the diagonal line portion when enlarging a character pattern is performed by shifting a part of the output data of the character pattern, interpolation can be performed relatively easily and with a small memory capacity.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a dot character pattern enlarging device according to an embodiment of the present invention, FIG. 2 is a block diagram of a switching circuit 7, and FIG. 3 shows six types of dot patterns stored in the diagonal line detection section 4. FIG. 4 is a diagram showing a non-interpolated dot pattern stored in the non-interpolation detection unit 5, FIG. 5 (1) is a diagram showing an example of a dot pattern, and FIG. 5 (2) is a diagram showing an example of a dot pattern. Fig. 5 (1) is a diagram showing the dot pattern enlarged twice, and Figs. 6 (1) to (15) explain the operation of enlarging the dot pattern of Fig. 5 (1) twice. This is a diagram for

This embodiment is an example in which a dot character pattern is enlarged twice.

The character pattern storage section 1 stores a dot character pattern for one character of maximum 8×8 dots. The three-column memory 2 inputs and stores three consecutive columns of dot patterns from the character pattern storage section 1 while shifting the dot patterns by one column. The diagonal line pattern detection section 3 stores six types of dot patterns (Fig. 2) that require interpolation among the 2×2 4-dot patterns, and inputs the dot patterns of the first two columns from the three-column memory 2. , shift the 2×2 4 dots by 1 bit to the above 6
The dot pattern is compared with the different types of dot patterns, and if it matches any of the dot patterns, the flag corresponding to the relevant bit among the detection flags 5 to 58 or detection flags 61 to 68 is set. Detection flag 5. ~5. is a right shift command flag, and detection flags 6 and 68 are left shift command flags. Figure 2 (1
) and (6) are left-shift dot patterns, and the others are right-shift dot patterns. The non-interpolation detector 4 compares the conditions shown in FIG. 3 with the 3-column memory 2 for the comparison operation of the diagonal line detector 3, and
If a pattern exists in any of the marked portions, the detection flags 51 to 58 or the detection flags 6° to 68 are not set. The switching circuit 7 assigns detection flags 5□ to 5 to the dot pattern in the first column read out from the three-column memory 2.
8 or the left shift or right shift data specified by the detection flags 6, . Registers 101゜10□, . . . where the data of the 8th bit, 2nd bit, ..., 8th bit are set.
, log, register 10+, and detection flag 61. Register 101 and detection flags 51 and 6□.

Register 102, detection flags 51 and 6□, register 10
2 and detection flags 52 and 6, 1 register 103 and detection flags 52 and 63. Register 10° and detection flags 53 and 6
4. Register 104 and detection flag5. and 64. Register 10. and detection flags 54 and 65. Register 10s and detection flags 54 and 65, register 105 and detection flag 5. and 68° register 108 and detection flag 5. and 66, register 106 and detection flags 56 and 67, register 107 and detection flags 56 and 62. Register 10° and detection flag 5
．． and 68. Register 10g and detection flag 5. and 68. OR circuits 111°112, . becomes "1", the ant circuits 21+, 21□, ..., 218 output the outputs of the OR circuits 11□, 11□, ...118, respectively.
When the second printing is performed, the signal line 302 becomes "L", so that the OR circuit 11! , 11□. , .

AND circuits 21e and 2 that output the outputs of 116, respectively.
1to,..., 21+a, and AND circuits 211 and 21
．． ．． 212 and 21. ,．． 213 and 21 ++, 214
and 211□, 215 and 2113° 216 and 2114.2
The outputs of 17 and 21+s, 21g and 21.6 are respectively input, and the registers 4]1 and 21 of the buffer memory 8 are respectively input.
412. ....

OR circuit 311.312.418. ....

It consists of 318. The data stored in the buffer memory 8 is provided to a printer head drive circuit (not shown). That is, when the signal line 30° becomes "1", the 1st bit of each column of character data or the 1st and 2nd bits of the printer head is transferred, the 2nd bit is transferred to the 3rd and 4th bits of the printer head, and the 3rd bit is transferred to the 3rd and 4th bits of the printer head. The bit is 5 of the printer head.
The 4th bit is given to the 7th and 8th printer heads, respectively, and one horizontal line is completed while printing one column of character data twice. Next, when the signal line 302 becomes "L", the 5th bit of each column of character data goes to the first and second printer heads, the 6th bit goes to the third and fourth printer heads, and the 7th bit goes to the third and fourth printer heads. The bits are given to the 5th and 6th printer heads, the 8th bit is given to the 7th and 8th printer heads, and one horizontal line is completed while printing one column of character data twice. At that time, one right shift bit or one left shift bit is applied to the printer head.

Next, the operation of the switching circuit 7 will be described in the case where the pattern shown in FIG. 5(1) is enlarged twice.

When enlarging and printing the X1 column (Fig. 6 (1)),
The pattern 1) is detected, and it is determined that right shift interpolation is required. Detection flag 5 for the 1st column of double stroke in the X1 column
．． 58 are not turned on as shown in FIG. 6 (2), and the outputs of AND circuits 213 and 214 become °°1" and X
The first row of double strokes in one row is enlarged as shown in FIG. 6 (4). Detection flag 5 for the second row of double strokes in the X1 row
4 to 58 are detection flags 52 as shown in FIG. 2 (4).
is turned on, the outputs of the AND circuits 213, 214, and 215 become "1", and the second column of the double stroke in the X1 column is enlarged as shown in FIG. 6(5). When enlarging the X2 column (FIG. 6 (6)), the pattern shown in FIG. 2 (1) is similarly detected, and it is determined that right shift interpolation is required. In this case, the detection flags 51 to 58 for the first row of double strikes are shown in Figure 6 (
As shown in 7), the detection flag 5□ is turned on, the outputs of the AND circuits 54°5s and 56 become "1", and the first column of the 2-variable stroke in the X2 column is enlarged as shown in Fig. 6 (9). be done.

Detection flags 51 to 5 for the second row of double strokes in the X2 column
8, the detection flag 53 is turned on as shown in FIG.
”, and the second row of the double stroke in the X2 row is shown in Figure 6 (10).
It will be enlarged as follows. , X3 column (Figure 6 (l l))
When enlarging the image, the pattern shown in FIG. 2 (1) is similarly detected, and it is determined that right-shift interpolation is required. in this case,
Detection flags 51 to 58 for the first row of double strikes are the sixth
As shown in Figure (12), detection flag 5! is turned on,
Ant circuit 21g, 21? , the output of 21g is “°1
'', and the first row of the double stroke in the X3 row is shown in Figure 6 (14).
It will be enlarged as follows. As shown in FIG. 6 (13), the detection flags 51 to 58 for the second column of the double stroke in the X3 column are not turned on, and the outputs of the AND circuits 21f and 21g become "1", and the The second column is enlarged as shown in FIG. 6 (I5).

FIG. 7(2) shows a pattern obtained by enlarging the dot pattern of FIG. 7(1) by two times using the apparatus of the present invention.

In the figure, the "○" mark indicates an interpolated portion, and the X mark indicates a non-interpolated portion.

In this example, an 8×8 dot character pattern was used.
It is obvious that the same process can be performed with other dot matrices such as 16x16 dots, 24x24 dots, etc.

[Effects of the Invention] As explained above, in the present invention, the interpolation pattern generation during enlargement is focused on correction of the diagonal line portion, so that the interpolation data can be generated by shifting a part of the output data of the character pattern. Because we take the method of filling in the shortcomings by
Character patterns can be enlarged relatively easily, and the memory capacity can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a dot character pattern enlarging device according to an embodiment of the present invention, FIG. 2 is a block diagram of a switching circuit 7, and FIG. 3 shows six types of dot patterns stored in the diagonal line detection section 4. FIG. 4 is a diagram showing a non-interpolated dot pattern stored in the non-interpolation detection unit 4, FIG. 5 (1) is a diagram showing an example of a dot pattern, and FIG. 5 (2) is a diagram showing an example of a dot pattern. Fig. 5 (1) is a diagram showing the dot pattern enlarged twice, and Figs. 6 (]) to (15) explain the operation of enlarging the dot pattern of Fig. 5 (1) twice. FIG. 7 is a diagram showing an enlarged example of a dot character pattern, and FIG. 8 is an explanatory diagram of a conventional interpolation method. 1...Character pattern storage unit 2...3-column memory 3...Diagonal line detection unit 4...
・Non-interpolation detection units 51 to 5a, 6+ to 68...Detection flag 7...Switching circuit 8...Buffer memory 10+ to 108
...Register 11+~ll, 6.31+~31B...OR circuit 21
1 to 26, 6...AND circuit 41. ~418...Register.

Claims (1)

[Scope of Claims] 1. A dot character pattern enlarging device for enlarging a dot character pattern and interpolating the diagonal line portion at the time, the dot character pattern being read out from a dot character pattern storage unit storing dot character pattern data. A three-column memory that stores three consecutive columns of character pattern data while shifting them by one column; first and second detection flags provided corresponding to each bit position of one column of dots; Of the 4-dot patterns in 2, 6 types of patterns that require interpolation are stored in advance, and each 2 x 2 4-dot pattern is stored in the 1st column data and the 2nd column data stored in the 3-column memory. The six types of patterns are sequentially compared, and when a match is found, the direction of the dot to be interpolated is determined based on the pattern, and if the dot on the right side of the dot is to be interpolated, the first detection flag is selected. Includes a diagonal line detection section that sets a flag for the bit position of a dot, or a flag for the bit position of the dot in a second detection flag if the left dot is to be interpolated, and four dots to be compared by the diagonal line detection section. a non-interpolation detection unit that prevents a first detection flag or a second detection flag of a bit of the dot from being set when a dot pattern consisting of 9 dots of 3×3 matches a predetermined pattern; and a buffer memory. , Input the dot data of the first column sequentially from the three-column memory,
While enlarging the dot data according to the enlargement magnification,
A dot character pattern enlarging device comprising a switching circuit that shifts dot data corresponding to a set first or second detection flag to the right or left and stores it in a buffer memory.