JP3359361B2 - Enlargement printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enlarged printing apparatus for enlarging and printing a binary image developed into a bitmap.

[0002]

2. Description of the Related Art In recent years, in the newspaper industry and the printing industry,
For example, in order to simultaneously publish a newspaper of the same manuscript in both the central region and the local region, there is a case where one manuscript is output to a different output device. For example, if the original is high resolution (for example, 400d
The output is required to be output to a laser printer of pi) or to a low-resolution (for example, 200 dpi) fax terminal of a branch office, and to a variety of devices having different output resolutions.

When a document, that is, an image is output to a high-resolution device, printing is performed by enlarging the image in accordance with the resolution of the output device. 18 to 21 are views for explaining a conventional enlarged printing apparatus.
Shows an original image 21 including black lines (lines L1, L4, L7) of uniform thickness, and FIG. 19 shows an original image 22 including black oblique lines. The original images 21 and 22 are composed of a plurality of lines L1 to L9 and each of the lines L1 to L9.
9 is a binary image composed of a plurality of pixels 50 in the horizontal direction (ABC...) And the value of each pixel 50 is binarized into white or black information. Note that a pixel is also called a halftone dot, and a binary image is also called a halftone dot image.

FIG. 20 shows an enlarged image 31 when the original image 21 shown in FIG. 18 is enlarged, and FIG. 21 shows an enlarged image 32 when the original image 22 shown in FIG. 19 is enlarged. In the conventional enlargement printing shown in FIGS. 20 and 21, a simple enlargement method is adopted.
It has expanded five times. The original image 2
Lines are added at a ratio of one line to two lines of 1, 22. For example, if the enlargement target line to be enlarged is the second line L2, the first line L1 and the second line L2
In the meantime, one line L2 'is added while keeping the white information of the second line L2 as it is. Note that the image is also expanded in the X direction, for example, a B ′ line is added to the B line.

[0005]

However, when a halftone dot image is enlarged by a conventional enlargement printing apparatus, FIG.
In the enlarged image 31 shown in FIG.
Additional lines L2 '(white), L4' (black), L6 '(white), L corresponding to L4 (black), L6 (white) and L8 (white)
8 ′ (white), the lines L1, L4 ′, L4, L
Only 7 is black, and the thickness of the black line is not uniform. That is, moiré fringes occur, and the image quality deteriorates.

In the enlarged image 32 obtained by enlarging the black oblique lines shown in FIG. 21, there is a problem that jaggies (that is, gathering) are conspicuous. The present invention has been made in view of such a point, and an object of the present invention is to provide an enlarged printing apparatus capable of reducing moire fringes and jaggies when a halftone image is enlarged. To provide.

[0007]

Means for Solving the Problems The present invention has the following constitution in order to solve the above-mentioned problems and achieve the object. FIG. 1 is a principle diagram of the first invention. The first invention will be described with reference to FIG.

A first aspect of the present invention is an enlarged printing apparatus for enlarging and printing a binary image. The enlarged printing apparatus is provided with horizontal and vertical lines and is provided with white or black binarized at equal intervals. An image memory 7 storing a value image is provided.

The enlargement direction designation means 1 designates at least one of horizontal and vertical directions in which the binary image is enlarged. Further, the enlargement target line calculation means 2 determines how many lines are to be increased by one line based on the enlargement ratio at which the binary image is enlarged, and based on the obtained value and the number of lines from a predetermined starting line. The enlargement target line is calculated by obtaining the position of the line to be enlarged.

The enlargement target line memory 3 stores a binary image corresponding to the enlargement target line read from the image memory 7, and the one-line-preceding memory 4 stores the binary image one line before the enlargement target line read from the image memory 7. , And the two-line preceding memory 5 stores the binary image corresponding to the line two lines before the line to be enlarged read from the image memory 7.

The candidate line generating means 6 generates a first candidate line by calculating the logical sum of the information held in the line memory 3 to be enlarged and the information held in the memory 4 immediately before the line. Information held in the memory 3 and the
The second candidate line is generated by taking the logical product with the information held in the line pre-memory 4.

The selecting means 10 extracts the image information held in the two-line preceding memory 5 for each pixel. If the information held by the extracted pixels is information indicating white, the extracting means 10 extracts the image information from the first candidate line. The information of the pixel corresponding to the position of the extracted pixel is extracted and used as information of the pixel to be stored at the position of the extracted pixel of the line to be inserted, or in the case of information indicating black, the information is extracted from the second candidate line. The information of the line to be inserted is generated by repeating the process of extracting the information of the pixel corresponding to the position of the extracted pixel and making the information of the pixel to be stored at the position of the extracted pixel of the line to be inserted. Then, the information generated by the selecting means 10 is written in the image memory 7 before the line to be enlarged.

FIG. 2 is a diagram showing the principle of the second invention. A second invention is an enlarged printing apparatus that enlarges and prints a binary image, and prints a binary image that has been binarized to white or black in horizontal and vertical lines and at equal intervals. The stored image memory 7 is provided.

An enlargement direction designating means 1 designates at least one horizontal or vertical direction in which the binary image is enlarged. The enlargement target line calculation means 2 determines the number of lines to be increased by one line based on the enlargement ratio at which the binary image is enlarged, and determines the enlargement target line based on the obtained value and the number of lines from a predetermined starting line. Then, a line to be enlarged is calculated by finding a line position where.

The enlargement target line memory 3 stores a binary image corresponding to the enlargement target line read from the image memory 7, and the one-line after memory 14 stores the binary image one line after the enlargement target line read from the image memory 7. , And the memory 15 after two lines stores the binary image corresponding to the line to be enlarged read out from the image memory 7.
A binary image corresponding to the line after the line is stored.

The candidate line generating means 6 generates a first candidate line by taking the logical sum of the information held in the line memory 3 to be enlarged and the information held in the memory 14 after one line. A second candidate line is generated by calculating the logical product of the information held in the memory 3 and the information held in the memory 14 after the one line.

The selecting means 10 is provided with the memory 15 after the two lines.
Is extracted for each pixel, and when the information of the extracted pixel is information indicating white, the information of the pixel corresponding to the position of the extracted pixel is extracted and inserted from the first candidate line. The information of the pixel to be stored at the position of the extracted pixel in the line to be used, or in the case of information indicating black,
A line to be inserted by repeatedly extracting, from the second candidate line, information of a pixel corresponding to the position of the extracted pixel and using the information as a pixel to be stored at the position of the extracted pixel of the line to be inserted Generate information for The information generated by the selecting means 10 is written after the line to be enlarged in the image memory 7.

More preferably, the following is desirable. That is, the candidate line generating means 6 and the selecting means 10 are configured to perform the processing for each pixel.

Further, the binary image may include white or black lines having a uniform thickness in the horizontal direction, or the binary image may include white or black diagonal lines. Further, the candidate line generating means 6 calculates a logical sum of the information from the line memory 3 to be enlarged and the information from the one-line preceding memory 4 to generate a first candidate line.
a, a logical product circuit (6b) that generates a second candidate line by obtaining a logical product of the information from the line memory 3 to be enlarged and the information from the memory 4 one line before Is also good.

The candidate line generating means 6 calculates the logical sum of the information from the line memory 3 to be enlarged and the information from the memory 14 after one line to generate a first candidate line. A circuit 6a for generating a second candidate line by calculating a logical product of the information from the line memory 3 to be enlarged and the information from the memory 14 after the one line. Is also good.

Further, the selecting means 10 selects the result of the OR circuit 6a when the information of the two-line preceding memory 5 is a white pixel "0", and
And the logical product circuit 6b
Is configured to select the result.

The selecting means 10 selects the result of the OR circuit 6a when the information in the second line memory 15 is a white pixel "0", and selects the result of the second line memory 1
5 is the black pixel “1”, the logical product circuit 6
It is configured to select the result of b.

Further, it may be configured to have a first line memory 8 for storing the result of the OR circuit 6a and a second line memory 9 for storing the result of the AND circuit 7.

[0024]

According to the first aspect, the enlargement direction designation means designates a direction in which the binary image is to be enlarged, and the enlargement target line calculation means performs enlargement processing from the lines in the designated direction based on the enlargement ratio. The enlargement target line is calculated.

Then, the enlargement target line memory 3 stores the information of the enlargement target line, the one line after memory 14 stores the information of the line one line before the enlargement target line, and the two lines after the memory 15 enlarges. 2 for the target line
Stores information about the line before the line.

Further, the candidate line generating means 6 generates a plurality of candidate lines to be added after the enlargement target line based on the information from the enlargement target line memory 3 and the information from the one-line after memory 14, Selects one of the candidate lines from the candidate line generating means 6 based on the information from the second line memory 15 and writes the candidate line after the line to be enlarged in the image memory 7 to generate an enlarged image.

That is, black and white addition candidates are obtained from the line to be enlarged and the line one line before, and the black and white addition candidates are selected from the black and white information two lines before the line to be enlarged to enlarge the image. So black pixels between white pixels,
And black and white images between black pixels.

In the second invention, a black and white addition candidate is obtained from a line to be enlarged and a line after one line, and then the black and white addition candidate is selected from black and white information two lines after the line to be enlarged. Since the image is enlarged, black pixels between white pixels and black-and-white images between black pixels can be guaranteed.

Therefore, according to the first and second aspects of the present invention, even if one black line exists between the white lines of the original image or one white line exists between the black lines, the designated image When performing enlargement, one black line between white lines or one white line between black lines can be guaranteed by referring to, for example, two lines before the line to be enlarged.

Therefore, the thickness of the line image can be unified, or jaggies can be suppressed for oblique lines. The black line in the white line in the image is ORed by the OR circuit 6a.
The processing can be guaranteed, and the white line in the black line in the image can be guaranteed by the AND processing by the AND circuit 6b.

Further, the selecting means 10 selects the result of the OR circuit 6a when the information of the two-line preceding memory 5 is a white pixel '0', and selects the result of the two-line preceding memory 5 as a black pixel. If the value is "1", the result of the AND circuit 6b is selected, so that one black line between white lines or one white line between black lines can be guaranteed.

The selecting means 10 selects the result of the OR circuit 6a when the information of the memory 15 after the second line is a white pixel "0", and
5 is the black pixel “1”, the logical product circuit 6
Since the result of b is selected, one black line between white lines or one white line between black lines can be guaranteed.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. <Structure of First Embodiment> FIG. 3 is a block diagram showing the structure of a first embodiment of an enlarged printing apparatus according to the present invention.

The image generation circuit 16 generates a binary image having a plurality of lines and a plurality of pixels in which each line is binarized to white or black, that is, an original image. The image is output to the image memory 7. As the original image, for example, there is a line drawing having a uniform thickness as shown in FIG. 18 or an image including oblique lines as shown in FIG.

The image memory 7 stores the original image from the image generation circuit 16. The enlargement direction designation unit 1 designates the horizontal direction (X direction) and the vertical direction (Y direction) as directions in which the binary image should be subjected to enlargement processing.

The enlargement target line calculation unit 2 specifies the enlargement ratio for the binary image and, based on the enlargement ratio,
An enlargement target line to be enlarged is calculated from the lines in the direction designated by the enlargement direction designation unit 1.

The enlargement target line memory 3 reads out the information of the enlargement target line calculated by the enlargement target line calculation unit 1 from the image memory 7 and stores it. One line previous memory 4
Reads the information of the line one line before the line to be enlarged from the image memory 7 and stores it.

The two-line preceding memory 5 reads out information of a line two lines before the line to be enlarged from the image memory 7 and stores it. An OR circuit 6a for generating a first candidate line by calculating a logical sum of the information from the line memory 3 to be expanded and the information from the memory 4 one line before; An AND circuit 6b for generating a second candidate line by calculating the logical product of the information from the line memory 3 and the information from the previous line memory 4.

Further, it has a line memory 8 for storing the result of the OR circuit 6a and a line memory 9 for storing the result of the AND circuit 7. Selector 1 as selection means
0 is based on information from the memory 5 two lines before,
Either the candidate line from the circuit 6a or the candidate line from the AND circuit 6b is selected and output to the line memory 11. That is, the selector 10 stores the two-line preceding memory 5
Is stored in the line memory 8 for the white pixel "0".
And the contents of the memory 5 two lines before are black pixels.
For "1", the contents of the line memory 9 are selected.

The line memory 11 writes a candidate line before the line to be enlarged in the image memory 7. Thus, an enlarged image is generated in the image memory 7, and the enlarged image is printed by outputting the enlarged image to a printing device (not shown). <Operation of First Embodiment> Next, an image enlarging process in the enlarging printing apparatus of the first embodiment will be described with reference to the drawings. (A) Enlargement processing of original image 21 shown in FIG. 18 FIG. 4 is a diagram for explaining the output of the fourth line of the original image including the line of uniform thickness shown in FIG. FIG. 6 is a diagram for explaining the output of the sixth line of the original image including the line of uniform thickness shown in FIG. 18 in the first embodiment.
FIG. 19 is a diagram illustrating an enlarged image of an original image including a line having a uniform thickness illustrated in FIG. 18 according to the first exemplary embodiment.

First, the enlargement direction designation unit 1 designates the X direction and the Y direction as directions in which the binary image is to be enlarged. Here, first, specify in the Y direction, then X
It shall be specified in the direction.

When the enlargement ratio for the binary image is designated by the enlargement target line calculation unit 2, the enlargement target line to be enlarged is selected from the lines in the direction designated by the enlargement direction designation unit 1 based on the enlargement ratio. Is calculated.

In the first embodiment, for example, in order to enlarge the original image by 1.5 times, a line constituting the original image is set to a predetermined starting line of the original image data, in this embodiment, two lines from the uppermost line position. Each line is set as an enlargement target line, and one line is added before the enlargement target line, that is, one line is added every two lines. Here, the line to be enlarged is 2 in the original image.
It is an even line of 4, 6, 8 lines. That is, the enlargement target line calculation unit 2 obtains the number of lines to be increased by one line based on the enlargement ratio, calculates what number of lines corresponds to what line, and sets the number as the enlargement target line.

Then, from the original image stored in the image memory 7, the white or black information of the line n to be enlarged is stored in the line memory 3 to be enlarged, and the information of the line one line before the line n to be enlarged is stored. Is stored in the one-line-previous memory 4 and the information of the line two lines before the line n to be enlarged is 2
It is stored in the pre-line memory 5.

In the example shown in FIG. 4, each pixel value “1111111111” of the fourth line is stored in the line memory 3 to be enlarged.
Each pixel value of the third line “00000000” is stored in the memory 4 one line before.
00 ”is stored, and the pixel value“ 0000000000 ”of the second line is stored in the memory 5 before the second line.

Then, the candidate line generating means uses the OR circuit 6a to store the information from the line memory
The logical sum with the information from the previous line memory 4 is obtained for each pixel.
Confuse. For example, for the pixel A, the enlargement target line memory 3
Has a pixel value (information) of "1"
Since the value is “0”, the logical sum “1” is the first candidate
It becomes the pixel value of A constituting the line, and the same applies to B
The pixel value of the line memory 3 to be enlarged is "1",
Since the pixel value of the pre-memory 4 is "0",
Let the sum “1” be the pixel value of B that constitutes the first candidate line
This is repeated and each pixel value "1111111111" is set to the first value.
Is generated as a candidate line.

The AND circuit 6b obtains, for each pixel, the logical product of the information from the line memory 3 to be enlarged and the information from the previous line memory 4, so that each pixel value "0000" is obtained.
A second candidate line composed of “00000” is generated. The result of the OR circuit 6a is stored in the line memory 8, and the result of the AND circuit 7 is stored in the line memory 9.

Further, in the selector 10, 2
If the contents of the memory 5 before the line 5 are white pixels "0", the information of the line memory 8 is selected. If the contents of the memory 5 before the lines 2 are black pixels "1", the information of the line memory 9 is selected. The information is selected.

In the example shown in FIG. 4, since the contents of the memory 5 two lines before are white pixels "0", the OR of the line memory 8
The processed information is selected. That is, each pixel value “11”
The first candidate line L4 ′ composed of 11111111 ″ is selected, stored in the line memory 11, and further written before the enlargement target line in the image memory 7, thereby enlarging the enlargement target line.

Next, when the same enlargement processing as the above-described four-line enlargement processing is performed on six lines as enlargement target lines, as shown in FIG. Each pixel value “0000000000” is stored,
Each pixel value of the fifth line “00000000” is stored in the memory 4 one line before.
00 ”is stored, and the pixel value“ 1111111111 ”of the fourth line is stored in the memory 5 before the second line.

The OR circuit 6a obtains, for each pixel, the logical sum of the information from the line memory 3 to be enlarged and the information from the memory 4 one line before, so that each pixel value "00" is obtained.
A first candidate line consisting of "00000000" is generated.

The AND circuit 6b obtains, for each pixel, the logical product of the information from the line memory 3 to be enlarged and the information from the previous line memory 4, so that each pixel value "0000" is obtained.
A second candidate line consisting of “00000” is generated.

Further, since the content of the memory 5 two lines before is a black pixel "1", the AND-processed information of the line memory 9 is selected. That is, the candidate line L6 ′ including each pixel value “0000000000” is selected.

Further, the above processing is performed for each of the enlargement target lines L
2, L4, L6, L8, L10,..., The lines L2′L4 ′, L2
6 ′, L8 ′, L10 ′... Are generated.

If the line to be enlarged is two lines, the line two lines before does not exist in the original image.
If “0” is set as an initial value in the memory 3 before two lines in which the line data two lines before is stored, “1” is likely to appear in the output data. If "1" is set as an initial value in the memory 3 two lines before, "0" is likely to appear in the output data.

When such enlargement processing is performed also in the X direction, an enlarged image 33 as shown in FIG. 6 is generated. In this manner, black and white addition candidates are obtained from the line to be enlarged and the line one line before, and the black and white addition candidates are selected from the black and white information two lines before the line to be enlarged, and the image is enlarged. , Black pixels between white pixels, and black and white images between black pixels.

Therefore, even when one black line exists between the white lines of the original image or one white line exists between the black lines, when the designated image is enlarged, for example, one of the lines to be enlarged By referring to two lines before, one black line between white lines or one white line between black lines can be guaranteed. Therefore, the thickness of the line image can be unified. (B) Enlargement processing of original image 22 shown in FIG. 19 Next, it is assumed that the original image 22 including oblique lines as shown in FIG. Enlargement processing (1.5 times) is performed in the X and Y directions.

As shown in FIG. 7, the image memory 7 stores an original image 22 including oblique lines in a binary form. As shown in FIG. 7, '1' is stored in a portion corresponding to the oblique line. In the example shown in FIG. 8, each pixel value “000001000” of the fourth line is stored in the enlargement target line memory 3, each pixel value “000000100” of the third line is stored in the memory 4 one line before, and Each pixel value “000000010” of the second line is stored in the memory 5.

Then, the candidate line generating means uses the OR circuit 6a to store the information from the enlargement target line memory 3 and the
The logical sum with the information from the previous line memory 4 is obtained for each pixel.
Confuse. For example, for the pixel E, a line memory to be enlarged
If the pixel value (information) of the third line is “0”,
Since the prime value is “0”, the logical sum “0” is the first candidate.
The pixel value of E constituting the complementary line is obtained.
As for the pixel value of the line memory 3 to be enlarged, "1",
Since the pixel value of the pre-line memory 4 is "0",
The logical sum “1” is defined as the pixel value of F that forms the first candidate line.
This is repeated to generate each pixel value “000001100” as a first candidate line.

The AND circuit 6b obtains, for each pixel, the logical product of the information from the line memory 3 to be enlarged and the information from the previous line memory 4, so that each pixel value "0000" is obtained.
00000 "is generated.

The contents of the memory 5 two lines before are white pixels "0"
At this time, each pixel value “0000011 0” is selected as the information of the OR processing of the line memory 8 and the memory 5
Is the black pixel “1”, the AND of the line memory 9
Each pixel value “0” is selected as the processed information.

In the example shown in FIG. 9, each pixel value "000100000" of the sixth line is stored in the line memory 3 to be enlarged.
Each pixel value of the fifth line “00001000” is stored in the memory 4 one line before.
0 ”is stored, and the pixel value“ 000001000 ”of the fourth line is stored in the memory 5 before the second line.

[0063] Then, the OR circuit 6a, by obtaining the logical sum of the information from the enlarged Target line <br/> Nmemori 3 with information from the previous line memory 4 for each pixel, each pixel value "000
A first candidate line consisting of 110000 "is generated.

The AND circuit 6b obtains, for each pixel, the logical product of the information from the line memory 3 to be enlarged and the information from the previous line memory 4, so that each pixel value "0000" is obtained.
00000 "is generated.

The contents of the memory 5 two lines before are white pixels "0"
At this time, each pixel value “000111 000” is selected as the OR-processed information of the line memory 8 and the two-line previous memory 5
Is the black pixel “1”, the AND of the line memory 9
Each pixel value “0” is selected as the processed information.

When the enlargement process is performed on the other lines to be enlarged, an enlarged image 34 of the original image including oblique lines as shown in FIG. 10 is generated. The enlarged image 34 shown in FIG.
Can greatly reduce jaggies with respect to the conventional enlarged image 32 shown in FIG. (C) Enlargement processing of character B For the original image 23 including the character B as shown in FIG.
When the enlargement processing is performed in the X direction and the Y direction, an enlarged image 35 including the character B as shown in FIG. 12 is generated. As can be seen from FIG. 12, in the enlarged image 35, the character B is enlarged relatively uniformly.

On the other hand, FIG. 13 shows an enlarged image 36 obtained by enlarging the original image 23 with a conventional enlarged printing apparatus. It can be seen that the thickness of the character B is not uniform. <Embodiment 2> FIG. 14 is a block diagram showing the configuration of an embodiment 2 of the enlarged printing apparatus according to the present invention, FIG. 15 is a diagram for explaining the output of the fourth line of the original image 21 shown in FIG. FIG. 19 is a diagram for explaining output of a sixth line of the original image 21 shown in FIG. 18.

In the first embodiment, black and white addition candidates are obtained from the line to be enlarged and the line one line before, and the black and white addition candidate is selected from the black and white information two lines before the line to be enlarged, and the image is displayed. Enlarged.

In the second embodiment, black and white addition candidates are obtained from the line to be enlarged and the line after one line, and then the black and white addition candidates are selected from the black and white information two lines after the line to be enlarged, and the image is displayed. The enlargement processing is performed.

For this purpose, instead of the one-line memory 4 in the first embodiment, a one-line memory 14 for reading and storing information of a line one line after the line to be enlarged from the image memory 7 is used. Provided.

Further, the pre-line memory 5 in the first embodiment
Is provided with a two-line after memory 15 for reading out the information of the line two lines after the line to be enlarged from the image memory 7 and storing it.

The other configuration of the second embodiment is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals.
Numbers are attached and details are omitted. In the example illustrated in FIG. 15, each pixel value “1111111” of the fourth line is stored in the enlargement target line memory 3.
111 "is stored, the pixel value" 0000000000 "of the fifth line is stored in the memory 14 after one line, and the pixel value" 0000000000 "of each pixel in the sixth line is stored in the memory 15 after the second line.

Then, the candidate line generating means uses the OR circuit 6a to output the information from the enlargement target line memory 3 and the
After one line, the logical sum with the information from the memory 14 is calculated for each pixel.
Ask. That is, the pixel value (information
Report) is "1" and the pixel value of the memory 14 after one line is "0".
Therefore, the logical sum “1” is used for the first candidate line.
This is performed for each pixel , and this pixel value “1111111111” is generated as a first candidate line.

The AND circuit 6b obtains, for each pixel, the logical product of the information from the line memory 3 to be enlarged and the information from the memory 14 after one line, thereby obtaining each pixel value "00".
A second candidate line consisting of "00000000" is generated.

After two lines, the contents of the memory 15 are white pixels.
Since it is 0 ", the OR-processed information of the line memory 8 is selected. That is, the first candidate line L4 'including each pixel value" 1111111111 "is selected and stored in the line memory 11.

In the example shown in FIG. 16, each pixel value “0000000000” of the sixth line is stored in the enlargement target line memory 3, and each pixel value “11” of the seventh line is stored in the memory 14 after one line.
11111111 "is stored, and the pixel value" 0000000000 "of the eighth line is stored in the memory 15 after the second line.

The OR circuit 6a obtains, for each pixel, the logical sum of the information from the line memory 3 to be enlarged and the information from the one-line memory 14 to obtain each pixel value.
A first candidate line consisting of 1111111111 ″ is generated.

[0078] The AND circuit 6b, the larger the logical product of the information from the target line memory 3 and information from the after one line memory 14 by the calculated Me Rukoto for each pixel, each pixel value "000
0000000 "is generated.

After two lines, the contents of the memory 15 are white pixels.
Since it is 0 ", the OR-processed information of the line memory 8 is selected. That is, the first candidate line L6 'including each pixel value" 1111111111 "is selected and stored in the line memory 11.

The enlarged image 37 thus enlarged.
Is shown in FIG. The enlarged image 37 is not uniform in line thickness than the enlarged image 33 of the first embodiment, but the conventional enlarged image 3
It is possible to reduce the 1 by remote moire fringe.

In the second embodiment, only the original image 21 shown in FIG. 18 has been described. However, the same effect can be obtained for the other original images 22 and 23. Further, in the embodiment, the enlargement ratio is set to 1.5 times, but can be set arbitrarily. Further, it may be a character, a diagonal line, or a line of uniform thickness included in the original image to be enlarged.

[0082]

According to the present invention, black-and-white addition candidates are obtained from the line to be enlarged and the line one line before, and then the black and white addition candidates are selected from the black-and-white information two lines before the line to be enlarged. Since the image is enlarged, black pixels between white pixels and black-and-white images between black pixels can be guaranteed.

Further, black and white addition candidates are obtained from the line to be enlarged and the line after one line, and then the black and white addition candidates are selected from the black and white information two lines after the line to be enlarged to enlarge the image. Therefore, black pixels between white pixels and black-and-white images between black pixels can be guaranteed.

Therefore, it is possible to provide an enlarged printing apparatus capable of reducing moire fringes and jaggies .

[Brief description of the drawings]

FIG. 1 is a principle diagram of the first invention.

FIG. 2 is a principle view of the second invention.

FIG. 3 is a configuration block diagram of a first embodiment of the present invention.

FIG. 4 is a diagram for explaining the output of the fourth line of the original image including the line of uniform thickness shown in FIG. 18 in the first embodiment.

FIG. 5 is a diagram for explaining output of a sixth line of the original image including the line having a uniform thickness shown in FIG. 18 in the first embodiment.

FIG. 6 is a diagram showing an enlarged image of an original image including a line having a uniform thickness shown in FIG. 18 in the first embodiment.

FIG. 7 is a diagram for explaining binarization of an original image including oblique lines shown in FIG. 19 in the first embodiment.

FIG. 8 is a diagram for explaining the output of the fourth line of the original image including the oblique lines shown in FIG. 19 in the first embodiment.

FIG. 9 is a diagram for explaining output of a sixth line of the original image including the oblique lines shown in FIG. 19 in the first embodiment.

FIG. 10 is a diagram illustrating an enlarged image of an original image including diagonal lines illustrated in FIG. 19 in the first embodiment.

FIG. 11 is a diagram illustrating an original image including a character B according to the first embodiment.

FIG. 12 is a diagram illustrating an enlarged image of an original image including a character B in the first embodiment.

FIG. 13 is a diagram showing an enlarged image when the original image shown in FIG. 11 is enlarged by a conventional enlarged printing apparatus.

FIG. 14 is a configuration block diagram of a second embodiment of the present invention.

FIG. 15 is a diagram for explaining the output of the fourth line of the original image including the line of uniform thickness shown in FIG. 18 in the second embodiment.

FIG. 16 is a diagram for explaining the output of the sixth line of the original image including the line of uniform thickness shown in FIG. 18 in the second embodiment.

FIG. 17 is a diagram showing an enlarged image of an original image including the line having a uniform thickness shown in FIG. 18 in the second embodiment.

FIG. 18 is a diagram showing an original image including a line having a uniform thickness.

FIG. 19 is a diagram showing an original image including oblique lines.

20 is a diagram showing an enlarged image when the original image shown in FIG. 18 is enlarged by a conventional enlarged printing apparatus.

21 is a diagram illustrating an enlarged image when the original image illustrated in FIG. 19 is enlarged by a conventional enlarged printing apparatus.

[Explanation of symbols]

 1. Enlargement direction designation unit 2. Enlargement target line calculation unit 3. Enlargement target line memory 4. One line previous memory 5. Two line previous memory 6a OR circuit 6b AND circuit 7. Image Memory 8, 9, 11 Line memory 10. Selector 14. Memory after 1 line 15. Memory after 2 lines 16. Image generation circuit 21, 22, 23. Original image 31-37. 50 pixels

Claims (4)

(57) [Claims] 1. An enlarged printing apparatus for enlarging and printing a binary image, wherein a binary image which is provided in a horizontal and vertical line and is arranged at equal intervals and which is binarized into white or black is stored. Image memory, an enlargement direction designating means for enlarging the binary image , at least one of horizontal and vertical directions, and a number of lines based on an enlargement ratio for enlarging the binary image.
To determine whether to increase one line by
The line to be expanded based on the number of lines from the starting line
Enlargement target line that calculates the enlargement target line by finding the in position
An in-calculation unit, an enlargement target line memory storing a binary image corresponding to the enlargement target line read from the image memory, and one of the enlargement target lines read from the image memory.
A one-line-previous memory for storing a binary image corresponding to a line preceding the line, and two of the enlargement target lines read from the image memory
A first candidate line is obtained by taking a logical sum of a two-line preceding memory for storing a binary image corresponding to a line preceding the line, information of the enlargement target line memory, and information of the one-line preceding memory. Candidate line generating means for generating a second candidate line by taking the logical product of the information held by the line memory to be enlarged and the information held by the one- line preceding memory; Extract image information for each pixel
When the information of the extracted pixel is information indicating white,
Is the position of the extracted pixel from the first candidate line.
Extraction of the line to be inserted by extracting the information of the corresponding pixel
Pixel information to be stored at the position of the pixel
In the case of the information indicating the extraction, the extraction from the second candidate line
Extracts and inserts information on the pixel corresponding to the position of the output pixel.
Of the pixel to be stored at the position of the extracted pixel in the power line.
Information on the line to be inserted by repeating
And selection means for generating a multi-address, large-size printing apparatus and writes the generated information of said selection means before the enlargement target line of the image memory. 2. An enlarged printing apparatus for enlarging and printing a binary image, wherein the binary image is arranged in a horizontal and vertical line and equidistantly and binarized into white or black. Image memory, an enlargement direction designating means for enlarging the binary image , at least one of horizontal and vertical directions, and a number of lines based on an enlargement ratio for enlarging the binary image.
To determine whether to increase one line by
The line to be expanded based on the number of lines from the starting line
Enlargement target line that calculates the enlargement target line by finding the in position
An in-calculation unit, an enlargement target line memory storing a binary image corresponding to the enlargement target line read from the image memory, and one of the enlargement target lines read from the image memory.
A memory after one line for storing a binary image corresponding to a line after the line, and two of the lines to be enlarged read from the image memory
A first candidate line is obtained by taking a logical sum of a second line memory for storing a binary image corresponding to a line after the line, information of the line memory to be enlarged, and information of the one line after memory. Candidate line generation means for generating a second candidate line by taking the logical product of the information held by the line memory to be enlarged and the information held by the memory after one line ; Extract image information for each pixel
When the information of the extracted pixel is information indicating white,
Is the position of the extracted pixel from the first candidate line.
Extraction of the line to be inserted by extracting the information of the corresponding pixel
Pixel information to be stored at the position of the pixel
In the case of the information indicating the extraction, the extraction from the second candidate line
Extracts and inserts information on the pixel corresponding to the position of the output pixel.
Of the pixel to be stored at the position of the extracted pixel in the power line.
Information on the line to be inserted by repeating
Selecting means for generating a report, wherein the information generated by the selecting means is written after the line to be enlarged in the image memory. 3. The enlarged printing apparatus according to claim 1, wherein the binary image includes a line having a uniform thickness of white or black in a horizontal direction. 4. The enlarged printing apparatus according to claim 1, wherein the binary image includes a white or black diagonal line.