JPH0522579A - Reduced printing method for two-dimensional picture element data - Google Patents

Abstract

PURPOSE:To reduce two-dimensional conversion picture element data obtained by rearranging the picture element arrays each other in a main and subscanning directions of two-dimensional picture element data that a sampling was performed for an original picture by a prescribed reading/scanning mode without the degradation of picture quality by printing the two-dimensional picture element conversion data by a printing mode finer than the sampling time. CONSTITUTION:The two-dimensional picture element data obtained by sampling an original picture 'a' by a reading scanning of a normal mode is rearranged in a main and sub-scanning direction A, B by successively designating an address at the time of transfer after the data is stored. Each reduced picture is obtained by printing the two-dimensional picture element conversion data 'c' obtained by the conversion of this line and column in a fine mode (d) and a super fine mode. In this case, the two-dimensional picture element data is not thinned out. Thus, sheets of paper is saved by a simple processing and a reduced picture can be obtained without the degradation of picture quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-dimensional pixel data reduction printing method applied to a facsimile apparatus, a printer apparatus or the like.

[0002]

2. Description of the Related Art Conventionally, when two-dimensional pixel sampling data obtained by reading and scanning with a facsimile machine is reduced and printed, a method of thinning out a part of the sampled pixel data has been adopted, resulting in deterioration of image quality. In order to prevent such deterioration of image quality,
It needed dedicated hardware. By the way, in recent years, a large number of facsimile machines use plain paper (PPC paper) instead of conventional dedicated paper, for example, roll-shaped thermal paper, but such plain paper is used. In such a case, when printing was completed with a roll-shaped thermal paper or the like, it would have been possible to cut at the end of printing, but even a short transmission original must use one sheet, and waste of paper cannot be avoided. Such problems also apply to printers and the like.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a reduction printing method for two-dimensional pixel data which is simple in image processing and does not deteriorate in image quality during reduction. Has a purpose.

[0004]

In order to achieve the above object, the present invention proposes a pixel array in the main scanning direction and the sub scanning direction of two-dimensional pixel data obtained by sampling an original image in a predetermined reading scanning mode. Characterized by printing the two-dimensional converted pixel data in a finer print mode than the print mode corresponding to the reading scan mode at the time of sampling after the two-dimensional converted pixel data are rearranged to obtain the two-dimensional converted pixel data. Is. In such a method of the present invention, when the generated two-dimensional conversion pixel data is printed, the printing is performed in a finer printing mode than the printing mode corresponding to the reading scanning mode at the time of sampling. After the 2D pixel data obtained by scanning is generated as 2D conversion pixel data, the 2D pixel data obtained by printing in the fine mode or the super fine mode or by scanning in the fine mode is converted into the 2D conversion pixel data. Is printed in super fine mode.

[0005]

According to the method of the present invention, the two-dimensional pixel data obtained by sampling the original image in the predetermined scanning mode are rearranged in the main scanning direction and the sub-scanning direction to generate two-dimensional conversion pixel data. After that, the two-dimensional conversion pixel data is printed in a finer printing mode than the printing mode corresponding to the reading / scanning mode at the time of sampling, so the sampled two-dimensional pixel data must be thinned out. There is no. In addition, the two-dimensional conversion pixel data can be performed by a simple process of rearranging the pixel arrays of the sampled two-dimensional pixel data in the main scanning direction and the sub scanning direction.

[0007]

EXAMPLES The method of the present invention will be described below. To facilitate understanding of the method of the present invention, a conventional printing method will be described first, and then the method of the present invention will be specifically described.

Normally, when an original image is sampled by a facsimile apparatus, there are a normal scanning mode, a fine scanning mode, and a super fine scanning mode as a reading scanning mode.
These modes have the same reading accuracy in the main scanning direction, but the reading accuracy in the sub scanning direction is
3.85 dots / mm, 7.7 dots / mm in the fine mode, and 15.4 dots / mm in the super fine mode. This means that the reading accuracy in the sub-scanning direction has a ratio of 1: 2: 4 in the normal mode, fine mode, and super fine mode. Therefore, for example, when the original image as shown in FIG. 3A is read and scanned and is sampled as two-dimensional pixel data, interlaced scanning of 3 pixels is performed in the normal mode, and therefore the scan shown in FIG. The pattern shown in FIG. 3C is stored in the memory in such a pattern as the interlaced scanning in the fine mode, and the pattern shown in FIG. 3D because there is no interlaced scanning in the super fine mode. Then, each will be stored in the memory.

In one of the print modes, normal,
In both fine and super fine print modes, no thinning or overlapping is performed in the main scanning direction, but in the sub scanning direction, in normal mode, the same three pixels are stored for one pixel stored in the memory. Are printed in duplicate, in the fine mode, the same one pixel is printed for each pixel stored in the memory, and in the super fine mode, they are printed without duplication.

Therefore, the original image shown in FIG. 3A is read and scanned in the normal mode and sampled as shown in FIG.
When the two-dimensional pixel data as shown in (a) is printed in the normal mode, the pixels are printed in triple overlapping in the sub-scanning direction as shown in FIG. 4 (b). When printed in the fine mode, pixels are overlapped in the sub-scanning direction as shown in FIG. 4 (c), and when printed in the super fine mode, as shown in FIG. 4 (d). It will be printed without duplication. However, in this figure, the dot size of one pixel in the print mode is described as a rectangle having a length of 0.5 and a width of 1.0.

Next, an embodiment of the method of the present invention will be described. In the method of the present invention, the two-dimensional pixel data obtained by sampling the original image in the predetermined scanning mode is rearranged in the main scanning direction and the sub-scanning direction to generate the two-dimensional pixel conversion data, and then the It is performed by printing in a more detailed print mode than the mode corresponding to the read scan mode.

Here, the generation of the two-dimensional pixel conversion data is as follows.
The pixels are sequentially read from the memory that stores the two-dimensional pixels obtained by sampling the original image, and the pixel data in the sampled two-dimensional pixel data represents the row and column in the first two-dimensional pixel data obtained by sampling the original image. This can be easily realized by sequentially designating the memory addresses when transferring the image data so that the converted array is obtained.

FIG. 1 shows pixel data in the main scanning direction A and sub scanning direction B for two-dimensional sampling pixel data obtained by reading and scanning the original image shown in FIG. 1A in the normal mode. An example is shown in which the two-dimensional pixel conversion data (FIG. 1C) obtained by rearranging is printed in the fine mode (FIG. 1D) and the super fine mode (FIG. 1E).

Here, the pixel "1" stored in the memory
Indicates black that is meaningful as information, “0” indicates white background information, and “*” indicates “0” for convenience in order to easily understand the positional relationship in the row and column direction. It is dummy data. As can be seen from this figure, the two-dimensional pixel data (FIG. 4A described later) obtained by sampling the original image in the normal mode and storing it in the memory is printed in the normal printing mode as the reference image (FIG. 4B). ) Compared to
Since the aspect ratio of the pixels is 1: 2, when printed in the super fine print mode, the height and width are both reduced to 1/2, and the area is correctly reduced to 1/4. It can be seen that a printed image is obtained, but when printing is performed in the fine mode, a printed image reduced in half in the horizontal direction is obtained.

Two-dimensional pixel data obtained by sampling in the normal mode and storing it in the memory (FIG. 4A)
Is printed in fine mode as it is (Fig. 4
(C)), the two-dimensional pixel data sampled in the normal mode and stored in the memory is further array-transformed in the main scanning direction and the sub-scanning direction to obtain the two-dimensional pixel conversion data, and then the fine mode is set. Printed image obtained by printing with
It can be seen that (d)) is only vertical and horizontal, and the dimensions are the same.

FIG. 2D shows two-dimensional sampling pixel data (FIG. 2) obtained by reading and scanning the original image in the fine mode.
For (b)), two-dimensional pixel conversion data (FIG. 2) obtained by rearranging pixel data in the main scanning direction and the pixel data in the sub scanning direction.
An example in which (c)) is further printed in the super fine mode is shown.

Also in this case, the two-dimensional pixel data (FIG. 2 (b)) obtained by sampling the original image in the fine mode and storing it in the memory is printed in the normal printing mode (FIG. 5 (b)). 2), the aspect ratio of one pixel is 1: 2. Therefore, when printing in the super fine print mode, the height and width are both 1/2 and the area is 1/4. It can be seen that a correctly scaled-down printed image is obtained, but when printed in the fine print mode, a printed image (FIG. 2 (d)) reduced to 1/2 in the horizontal direction is obtained. ..

The two-dimensional pixel data sampled in the fine mode and stored in the memory and printed in the fine mode as it is, and the two-dimensional pixel data sampled in the fine mode and stored in the memory are obtained. ,
Further, the two-dimensional pixel conversion data obtained by the array conversion in the main scanning direction and the sub-scanning direction are printed in the fine mode, and only the vertical and horizontal directions are reversed, and there is no difference in size. Is the same as when sampling is performed in the normal mode.

Next, an example of using the method of the present invention will be described. In the method of the present invention, as described above, the sampled two-dimensional pixel data can be reduced without thinning out. Therefore, by using such a method, a plurality of pages of facsimile images received at the time of printing output of the facsimile apparatus are combined. It is possible to print on one sheet of recording paper.

When such image combination is performed, a compression-coded signal is usually transmitted to the facsimile apparatus. Therefore, when the present invention is executed, the received image data for one page is temporarily transmitted. Replace with the decoded two-dimensional image, generate the two-dimensional conversion pixel data by the procedure described above, and then synthesize a plurality of two-dimensional conversion pixel data to obtain new composite image data and print it out. Good. In this case, in the present invention, the sampled two-dimensional pixel data (FIGS. 6A and 6B) and the two-dimensional converted pixel data (FIG. 6C) that is printed out are reversed in vertical and horizontal directions. Since the image is reduced in size and printed out, it is necessary to combine the images in consideration of the positional relationship. At this time, the positional relationship between the print images reduced and printed on one sheet of recording paper can be easily made by adding necessary blank information when the composite image is generated, and the ratio of the vertical and horizontal dimensions of one pixel is 1 :. In the case of 2, the ratio of the vertical and horizontal dimensions of the standard image in which the sampled image data is directly printed in the normal mode and the reduced image in which the two-dimensional conversion pixel data is printed in the super fine mode is 2: 1. , The area ratio becomes 4: 1, and four images can be reduced and printed on one sheet. Further, in the present embodiment, particularly when the image data sampled in the normal mode is printed in the super fine mode, reduction printing can be performed without changing the image of the image, which is more preferable. The reduction printing method of the present invention is not limited to the case of printing the received image on the facsimile device, but can be applied to the case of obtaining a copy image on the facsimile device or the printing of a printer or the like.

Next, the flowcharts 100 to 10 of FIG.
7, the present invention is applied to a facsimile machine,
The operation when combined will be described. First, when there is an incoming call,
Determine if reduced print mode is available. If not specified, normal print is used. If the reduced print mode is specified, it is stored in the memory. Then, if the received original is not more than two pages, the normal printing is performed. If there are 2 pages or more, convert the pixel data stored in the memory as described above,
Generates pixel data and prints in the specified reduced print mode. In that case, the position of the image can be designed by designating the printing place on one sheet of paper. In the case of a plurality of originals, the position of the image is designed correspondingly.

In the reduction printing method of the present invention, when the facsimile apparatus is used as a copy, for example, the original is read in the normal mode, and the memory in which the lines are mutually converted is used.
By outputting in the fine mode and the super fine mode, two originals can be combined and taken out as one copy sheet.

[0023]

As described above, according to the present invention, paper can be saved by a simple process, and a reduced image can be obtained without deteriorating the image quality.

[Brief description of drawings]

FIG. 1 is an explanatory diagram when the present invention is applied to two-dimensional pixel data obtained by sampling an original image in a normal mode.

FIG. 2 is an explanatory diagram when the present invention is applied to two-dimensional pixel data obtained by sampling an original image in a fine mode.

FIG. 3 is a schematic explanatory diagram when an original image is stored in a memory in a normal mode, a fine mode, and a super fine mode.

FIG. 4 shows pixel data in a memory in which two-dimensional pixel data is read and scanned in a normal mode and stored, in a normal mode.
It is a schematic explanatory view when printing in a fine mode and a super fine mode.

FIG. 5 shows pixel data in a memory in which two-dimensional pixel data is read and scanned in a fine mode and stored in a normal mode,
It is a schematic explanatory view when printing in a fine mode and a super fine mode.

FIG. 6 is a schematic diagram showing how to embody the present invention to synthesize two original images and
FIG. 6 is a diagram showing an example of printing on a sheet of recording paper.

FIG. 7 is a flow chart showing an embodiment when the present invention is used in a facsimile machine.

[Explanation of symbols]

 A ... Main scanning direction B ... Sub scanning direction

Claims (1)

Claim: What is claimed is: 1. A two-dimensional conversion pixel data is obtained by rearranging pixel arrays of two-dimensional pixel data obtained by sampling an original image in a predetermined scanning mode in the main scanning direction and the sub-scanning direction. After that, the two-dimensional converted pixel data is printed in a finer printing mode than in the printing mode corresponding to the reading scan mode at the time of sampling, which is a reduced printing method of the two-dimensional pixel data.