JPH08139915A - Multicolor image enlargement / reduction device - Google Patents

Abstract

PURPOSE: To provide the output of an image whose line width is the same as that of the input image of a multi-color image by deciding the position and the line width as to one line among one line or over and arranging relatively the remaining lines depending on the line width. CONSTITUTION: A line position decision means 106 decides positions x1 ', x2 ' of lines 203, 204 obtained by magnifying/reducing lines 201, 202. That is, the means 106 rounds off, omits or raises to the tenth of fractions x1 ×x-scale and x2 ×x-scale as the x1 ', x2 ', where x-scale is a magnification/reduction rate in the lateral direction. Moreover, line width decision means 107 decides sets of width l1 ', l2 ' of the lines 203, 204 resulting from magnifying/reducing the lines 201, 204. That is, the means 107 rounds off, omits or raises to the tenth of fractions |l1 ×x-scale| and |l2 ×x-scale| as the l1 ', l2 ', where x-scale is a magnification/reduction rate in the lateral direction. As a result, in the case of the l1 =l2 for an input image, the width of the output image has a relation of l1 '=l2 '.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to enlarging / reducing a multicolor image, and more particularly to an image processing apparatus for moving lines of the same width to the same width.

[0002]

2. Description of the Related Art Conventionally, as a method for enlarging / reducing a black-and-white binary image, Japanese Patent Laid-Open No. 58-97958 and Journal of Image Electronics Engineers, Vol. The high-speed projection method and the like described in 72-83 are considered. In the projection method, the average density of an input image projected on a certain output image is obtained, and the value is thresholded to determine the pixel value of the output image. The high-speed projection method converts the average density of the input image into a simple logical operation,
It is intended for speeding up.

Further, the above projection method can be easily applied to a multicolor image.

[0004]

The projection method described in the above prior art has a drawback that lines having the same width in the input image do not always have the same width in the output image.
The same is true for multicolor color images.

It is an object of the present invention to make a line having the same width in an input image in a multicolor image have the same width in the output image.

Further, in the case of a multicolor image, an overlap or a gap may be generated between adjacent figures of different colors due to a calculation error.

A second object of the present invention is to prevent such overlapping of figures and the generation of gaps.

[0008]

SUMMARY OF THE INVENTION The above-mentioned object is to provide an image processing apparatus that uses an image in which one of a plurality of color attributes is given to each pixel as an input image and an output image, and selects one of the color attributes. Means for designating as a background color (hereinafter referred to as background color designating means), means for designating vertical and horizontal enlargement / reduction ratios (hereinafter referred to as enlargement / reduction ratio designating means),
The enlarging / reducing means includes means for enlarging / reducing the input image according to the enlarging / reducing ratio designated by the enlarging / reducing ratio designating means to be an output image (hereinafter referred to as enlarging / reducing means). A means for extracting a line of pixels of the same color in the vertical direction or the horizontal direction having a color attribute other than the background color designated by the background color designating means as a line (hereinafter referred to as a line extracting means), and a sequence for input images Means for selecting one of the selected one or more lines and determining the position of the output image at the predetermined position in the output image according to the enlargement / reduction ratio designated by the enlargement / reduction ratio designating unit (hereinafter, line (It is called the position determining means)
And means for determining the line width of the output image according to the line width of the input image and the enlargement / reduction ratio designated by the enlargement / reduction ratio designating unit (hereinafter referred to as line width determining unit), In (1), a means for arranging one or more continuous lines in the output image so as to be an array of one or more continuous pixels (hereinafter, referred to as line position correcting means).

[0009]

The enlarging / reducing means has a position in the output image determined by the line position determining means with respect to one line of one or more continuous lines in the input image with the width determined by the line width determining means. The remaining lines are arranged at the positions in the output image determined by the line position correction means and with the width determined by the line width determination means.

In this way, in a multicolor image, lines having the same width in the input image have the same width in the output image, and it is possible to prevent overlapping or gaps between figures from occurring. You can

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a configuration example of a multicolor color image enlarging / reducing apparatus embodying the present invention will be described with reference to FIG.

The multicolor color image enlarging / reducing device 101 is
An image in which one of a plurality of color attributes is given to each pixel is used as an input image, and an enlarged or reduced version of the input image is used as an output image.

The multicolor image enlargement / reduction device 101 is
It is designated by the background color designating means 102 which designates one of the color attributes as the background color, the enlargement / reduction designating means 103 which designates the enlargement / reduction ratio in the vertical and horizontal directions, and the enlargement / reduction ratio designating means 103. The enlarging / reducing means 10 for enlarging / reducing the input image according to the enlarging / reducing ratio to obtain the output image.
And 4.

Further, the enlarging / reducing means 104 is a line extracting means for extracting, as a line, an array of pixels of the same color in the vertical direction or the horizontal direction having a color attribute other than the background color designated by the background color designating means 102. 105. Enlarging / reducing ratio designating means which selects one of the continuous lines in the input image, and which position in the output image the specific position of the line (eg, left end, center, right end, etc.) should be. Line position determining means 10 for determining according to the enlargement / reduction ratio designated by 103
6. Enlargement / reduction ratio designating means 10 for the width of each line in the output image
The line width determining means 107 determines according to the enlargement / reduction ratio designated by 3, and the line position correcting means 108 for arranging so that continuous lines in the input image are continuous in the output image.

Next, referring to FIG. 2, the first object of the present invention is to describe a method for making lines having the same width in the input image have the same width in the output image.

Generally, for image enlargement / reduction, a desired output is created by first creating an image that is enlarged / reduced in the vertical or horizontal direction and then enlarging / reducing the image in the remaining direction. Get the image. Therefore, it suffices to consider only the enlargement / reduction in only one direction. In the following, only horizontal scaling will be considered.

Further, it is necessary for the line position determining means 106 to select one of the continuous lines and further to determine the specific position of the line, but in the following, the leftmost line is always used. Although the specific position will be described as the leftmost position, the same applies to other cases.

As shown in FIG. 2, one line 201 has a width of 1 ₁ starting at the position of x ₁ and another line 202.
Takes as an example the case where it starts from the position of x ₂ and has a width of 1 ₂ .

At this time, the line position determining means 106 determines the positions x ₁ ′ and x ₂ ′ of the lines 203 and 204 obtained by enlarging / reducing the lines 201 and 202. That is, the line position determining means 106 determines, for example, the horizontal enlargement / reduction rate as x.
_Scale, x ₁ × x_scale, x ₂ × x_scale
It is sufficient to use means for rounding off, rounding down or rounding up the first decimal place to x ₁ ′ and x ₂ ′, respectively.

Further, the line width determining means 107 causes the line 20
Lines 203 and 204 obtained by enlarging / reducing 1 and line 202
The widths 1 ₁ ′ and 1 ₂ ′ of the are determined. That is, the line width determining means 1
For example, when the horizontal enlargement / reduction rate is x_scale, 07 is 1 ₁ × x_scale, 1 ₂ × x_scale is rounded to one decimal place, rounded down or rounded up to 1 ₁ ′ and 1 ₂ ′, respectively. It will be good if it is a means to become.

By doing so, if the input image has the same width (1 ₁ = 1 ₂ ), the output image can also have the same width (1 ₁ ′ = 1 ₂ ′).

Next, a second object of the present invention, that is, a method for preventing the occurrence of overlapping or gaps between figures will be described.

Before that, the overlap between the figures and the generation of the gap will be described with reference to FIG.

As shown in FIG. 3, one line 301 begins at position x ₁ and has a width of 1 ₁ and another line 302
Has a width of start 1 ₂ from the position of the x _2, taking a case in which continuous in Examples. That is, x ₂ = x ₁ +1 ₁ .

As in the case of FIG. 2, the line position determining means 10
Line 3 which is obtained by enlarging / reducing line 301 and line 302 by 6
The positions x ₁ ′ and x ₂ ′ of 03 and line 304 are determined. Further, the line width determining means 107 causes the line 301 and the line 302.
The widths 1 ₁ ′ of the lines 303 and 304 obtained by enlarging and reducing
1 ₂ 'is determined. However, in the calculation in the line position determining means 106 and the line width determining means 107, since rounding, rounding up or rounding down is performed, x ₂ ′ = x ₁ ′ is not always required.
It cannot be +1 ₁ '. At this time, x ₂ ′> x ₁ ′ +1 ₁ ′
If so, an overlapping portion is formed, and if x ₂ ′ <x ₁ ′ +1 ₁ ′, there is a gap.

The present invention which solves this problem will be described with reference to FIG.

First, the line 4 is determined by the line position determining means 106.
The position x ₁ ′ of the line 404 obtained by scaling 01 is determined. Further, the line width determining means 107 determines the width ₁₁ 'of the line 404 obtained by enlarging / reducing the line 401.

Next, the line 4 is corrected by the line position correcting means 108.
The position x ₁ ′ +1 ₁ ′ of the line 405 obtained by enlarging / reducing 02 is determined. Further, the line width determining means 107 causes the line 402
The width 1 ₂ ′ of the line 405 obtained by enlarging / reducing is determined.

Similarly, the position x ₁ ′ +1 ₁ ′ + of the line 406 obtained by enlarging / reducing the line 403 by the line position correcting means 108.
1 ₂ 'is determined. Further, the line width determining means 107 determines the width 1 ₃ ′ of the line 406 obtained by enlarging / reducing the line 403.

In other words, the line position correction means 108 uses the line 401
The position of the scaled line 405 of the continuous line 402 is the position x ₁ ′ of the scaled line 403 of the line 401 and the width ₁₁ ′ (if necessary, the scaled line 405 of the scaled line 402). It may be any means that can be determined from the width 1 ₂ ′) of the. In this embodiment, the line position determining means 106
Since the leftmost line is always selected as one of the continuous lines and the specific position is the left end, the position of the line 405 is set to x ₁ ′ +1 ₁ ′.

Subsequently, the line position correcting means 108 determines the position of the line 406, which is the line 403 that is continuous with the line 402, as the position x ₁ ′ +1 ₁ ′ of the line 404 that is the line 402 that is expanded and reduced. Width 1 ₂ ′ (if necessary, line 403
From the width 1 ₃ ′) of the line 406 that has been enlarged or reduced. In this embodiment, the position of line 406 is x ₁ ′ +1 ₁ ′ +1.
₃ '.

By doing the above, it becomes possible to prevent overlapping of figures and generation of gaps.

[0033]

According to the present invention, the position and line width of one line of one or more continuous lines in an input image are determined, and then the remaining lines are relative to each other according to the line width. To place. Therefore, in a multicolor image, lines having the same width in the input image have the same width in the output image, and it is possible to prevent overlapping of figures and generation of gaps.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a multicolor image enlargement / reduction device.

FIG. 2 is an explanatory diagram of line width saving.

FIG. 3 is an explanatory diagram of a problem in enlarging / reducing a multicolor color image.

FIG. 4 is an explanatory diagram of a method for solving the problem.

[Explanation of symbols]

 101 ... Multicolor image enlargement / reduction device, 102 ... Background color designation means, 103 ... Enlargement / reduction ratio designation means, 104 ... Enlargement / reduction means, 105 ... Line extraction means, 106 ... Line position determination means, 107 ... Lines Width determining means, 108 ... Line position correcting means.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location H04N 1/60 1/46 H04N 1/40 D 1/46 Z (72) Inventor Yasuo Kurosu Kanagawa Prefecture 1099, Ozenji Temple, Aso-ku, Kawasaki-shi, Ltd. System Development Laboratory, Hitachi, Ltd.

Claims (2)

[Claims] 1. An image processing apparatus that uses an image in which one of a plurality of color attributes is assigned to each pixel as an input image and an output image, and means for designating one of the color attributes as a background color. The input image is enlarged or reduced according to the enlargement / reduction ratio designated by the means for designating the enlargement / reduction ratio in the vertical and horizontal directions and the enlargement / reduction ratio for the vertical or horizontal direction. And a means for converting the input image into an output image by enlarging / reducing the input image, the means other than the background color designated by the means for designating one of the color attributes as the background color. Means for extracting, as a line, an array of pixels of the same color in the vertical or horizontal direction having an attribute;
One of a series of one or more consecutive pixels in the input image is selected, and the position in the output image of the predetermined position of the series of pixels is specified in the vertical and horizontal enlargement / reduction ratios. The means for determining according to the enlargement / reduction ratio specified by the means, and the means for specifying the width of the pixel arrangement of the output image and the width / vertical enlargement / reduction ratio in the input image And a means for deciding according to the enlargement / reduction ratio, and a means for arranging such that the arrangement of one or more continuous pixels in the input image is arranged so that the arrangement of one or more continuous pixels in the output image is also provided. Characteristic multicolor color image enlargement / reduction device. 2. The means for arranging one or more continuous pixels in the input image so that the output image also has one or more continuous pixels in the output image. One of the above pixel arrangements is selected, and the position in the output image at the predetermined position of the pixel arrangement is specified by means of specifying the enlargement / reduction ratio in the vertical and horizontal directions. The width determined according to the enlargement / reduction rate specified by the means for designating the vertical / horizontal enlargement / reduction rate for the pixel arrangement at the position in the output image determined by the means for determining the reduction rate. The arrangement of the remaining pixels is the width determined according to the enlargement / reduction ratio designated by the means for specifying the enlargement / reduction ratio in the vertical and horizontal directions so that the pixels in the output image are adjacent to each other. Multicolor to place in Scaling apparatus of the color image.