JPH02197895A - Character pattern magnification device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention stores coordinate data of bending points of character outlines, and expands the coordinate data by multiplying it by a scaling factor to obtain a desired size. The present invention relates to a character pattern magnification device that can obtain character patterns.

Conventional technology In recent years, in order to reduce costs and generate high-quality characters, 1
2. Description of the Related Art Character pattern scaling devices that enlarge or reduce contour character patterns, which can generate any character using a single character pattern, have come into use.

However, when an outline character pattern is enlarged or reduced without any correction, characters with uneven line widths are generated due to rounding such as rounding when discretizing the character pattern.

Conventionally, in order to prevent this, a line width control method during enlargement/reduction has been proposed (Jikai 62-63384).

A conventional character pattern scaling device will be described below.

FIG. 7 is a block diagram showing the configuration of a conventional character pattern scaling device. 12 is the basic outline character pattern, 1
Reference numeral 3 denotes an inflection point extracting section that extracts an inflection point from the basic outline character pattern 12, and 14 a coordinate conversion section that enlarges or reduces the coordinate values of the inflection points of the inflection point extracting section 13. Reference numeral 15 denotes an attribute assigning unit that assigns attributes such as vertical lines, M lines, decorations, etc. to the bending points extracted by the bending point extracting unit 13. Reference numeral 17 denotes a bending point control section that performs line width control based on the control information created by the line width control information creation section 16. Reference numeral 18 denotes a filling section that fills in the bending points generated by the bending point control section 17. 19 is an enlarged/reduced character pattern obtained by enlarging or reducing the base character pattern and controlling the line width.

Problems to be Solved by the Invention However, in the configuration of the conventional example described above, multiple lines having the same line width in the base outline character pattern have the same line width, but because the base outline character pattern balances the characters. If the line width is 1.2 dots thicker (or thinner) and you reduce it, the lines that would be better to keep the same width may become different. For example, as shown in Figure 5, The width of the vertical line of the character ``A'' sometimes became inconsistent.

Means for Solving the Problem In order to solve this problem, the present invention detects the line width of an outline character pattern, classifies it according to each line width, and calculates a target line width for each group of classified lines. and a configuration that corrects the line width of the scaled character pattern to the line width calculated by the calculation means.

According to the present invention, with this configuration, even if there is a slight difference in line width in the base character pattern, the line width is corrected to the same line width when reduced.

Embodiment FIG. 1 shows a functional block diagram of a pattern magnification changing device according to an embodiment of the present invention.

Reference numeral 1 denotes an outline character pattern data storage section in which data representing character patterns in coordinate values is stored. 3 is a component point extraction unit that detects bending points forming vertical lines and horizontal lines from the line segments extracted by the line segment extraction unit 2 which extracts vertical and horizontal line segments from the character pattern data imported from the outline character pattern storage unit 1; It is. Reference numeral 4 denotes a line width detection unit that calculates the line width and center line from the constituent points extracted by the constituent point extraction unit 3. Reference numeral 5 denotes a target line width detection unit that groups the line widths determined by the line width detection unit 4. 6 is
This is a bending point coordinate conversion section that performs coordinate conversion by multiplying the bending points stored in the outline character pattern storage section 1 by a predetermined enlargement/reduction ratio. 7 are the constituent points, line widths, and
This is a line width conversion unit that converts data by multiplying the center line by the above-mentioned enlargement/reduction ratio and the enlargement/reduction ratio. Reference numeral 8 denotes a decoration detecting section that detects decorative points associated with the constituent points extracted by the constituent point extracting section 3. Reference numeral 9 denotes a bending point correction unit that corrects the bending point using the data detected above. Reference numeral 10 denotes a filling section that fills in the coordinate values corrected by the bending point correction section 9. Reference numeral 11 indicates an enlarged or reduced character pattern obtained by the filling section 10.

The operation of the inflection point correction method for enlarging and reducing the contour character pattern constructed as described above will be explained below, using the character "A" in FIG. 2 as an example.

First, the coordinate values of the bending points PO to P54 of the character pattern shown in FIG. 2 are taken in. These coordinate values take integer values in X-Y orthogonal coordinates with the origin at the lower left as shown in the figure.

Here, in Figure 3, the character size of the example character "A" is 109
This is outline character pattern data of 2x1092 squares.

Next, line segments are obtained by connecting bending points Pi and Pi+1, and the slope of each line segment is calculated.

Based on the calculated slope, line segments forming vertical lines and horizontal lines are extracted.

(1) If the slope of the line segment is ±Δl, the horizontal line segment (2) Vertical line segment when the slope of the line segment is ±Δ2 Δ1 and Δ2 are predetermined threshold values.

From the line segment information obtained in this way, the line segments that make up each vertical line (horizontal line) are detected, and the right (top) starting point and right (top) starting point of the vertical line (horizontal line) are detected. The constituent points of the end point, the left (bottom) start point, and the left (bottom) end point are extracted.The center line and line width are calculated from the four extracted constituent points.

Then, the line widths obtained above are grouped separately into vertical lines and horizontal lines. Regarding line width grouping, the following processing is performed.

[Processing 1] Determination of standard width for grouping 1, Width 2 with the most number, Width 3 with the most number included within ±α of the width with the most number, Median line (line with line width close to the center of variation) ) The priority order for determining the width reference width closest to 1.2.3. If a width that satisfies 1 is not found, 2. If a width that satisfies 2o is not found, move to step 3. Move to.

[Process 21 The reference width ±α determined in Process 1 is defined as one group, and the average within the group is taken.

[Process 31 Repeat Process 1 and Process 2 until all line widths are grouped.

Here, α is expressed by the following formula.

α=Number of dots in the base character pattern ÷ Enlargement * Number of reduced dots FIG. 6 shows the line width before grouping and the line width after grouping.

Next, set the predetermined expansion/reduction ratio to the inflection point PO.
~Put on P64. The four points, the center line, the line width obtained by grouping the line widths, and the line constituent points, are similarly multiplied by the enlargement and reduction ratios.

Next, decorative points belonging to the four constituent points are detected from points other than the bending points that make up the vertical line and the horizontal line.

To the right of the line width and center line coordinates obtained from the line width grouping,
Calculate the top, left, and bottom line widths. The difference between the target line width obtained in this way and the line width obtained by the coordinate transformation of each bending point is determined, and this value is used as the correction amount. The correction amount is determined for each of the four points.

For vertical lines, apply the correction amount calculated as above to the right start point, end point, left start point, and end point; for horizontal lines, apply the correction amount to the upper start point, end point, lower start point, and end point. Each correction amount is applied to the points and the decorations belonging to those points.

By filling in the coordinate data obtained as described above, a high-quality character pattern can be generated. For example, the character "A" is output as shown in FIG. 4, unlike the character shown in FIG. 5, in which the vertical lines are output with uniform widths.

Effects of the Invention The present invention classifies each line width of a basic outline character pattern, calculates a target line width for each line group, and corrects the character pattern after scaling so that it has this target line width. Therefore, even if the line widths of the basic outline character pattern differ slightly, this can be reduced to obtain a high-quality character pattern in which variations in line width are not noticeable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a character pattern scaling device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram for extracting correction information for the example character "A" for bending point correction.
Figure 3 shows the coordinate data of the example character pattern, Figure 4 shows the coordinate data of the example character pattern.
The figure shows the character pattern when line width is controlled.
Figure 5 is a diagram showing the character pattern when line width control is not performed, Figure 6 is an explanatory diagram showing the correspondence before and after line width is grouped, and Figure 7 is a diagram showing the character pattern when changing the line width. FIG. 2 is a block diagram showing the configuration of a multiplication device. 1... Contour character pattern storage unit 2... Line segment extraction unit 3... Constituent point extraction unit 4... Line width detection unit 5... Target line width detection unit 6... Bend point coordinate conversion Section 7... Line width conversion section 8... Decoration detection section 9... Bend point correction section 0... Filling section 1... Enlarged or reduced character pattern 2... Base outline character Pattern 3...Bending point extraction section 4...Coordinate conversion section 5...Attribute assignment section 6...Line width control information creation section 7...Bending point control section 8...Filling section 9...・Enlarged/reduced character pattern Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Scope of Claims] Character pattern storage means for storing coordinate data of bending points of character outlines; and line width detection means for detecting the line width of each line constituting a character from the data stored in the storage means. a classification means for classifying line widths detected by the line width detection means; a calculation means for calculating a target line width for each line group classified by the classification means; and a character pattern storage means. scaling means for multiplying the stored coordinate data by a scaling factor; correction means for correcting the line width of the character pattern based on the coordinate data scaled by the scaling means to the line width calculated by the calculating means; A character pattern magnification device comprising: