JPH0414911B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] When outputting a document similar to a document whose characters are output on a device (A) with a certain pixel density using a device (B) with a different pixel density, the origin of the document output area (X ₀ , Y ₀ ) and the origin of the character letterface (X ₂ , Y ₂ ) are on the device (B)
The origin of the character body face (X ₁ , Y ₁ ) is expressed by the pixel density of device (A), and the origin of the character body face (X 1 , Y 1 ) is expressed by the pixel density of device (A).
When the pixel density ratio of the device (B) is α and β in the vertical and horizontal directions, the output position of the character letterface (X,
A character output control method is shown in which Y) is converted and determined using a predetermined formula according to an output format.

[Industrial application field]

The present invention relates to a character output control method that enables, when character data created for a laser printer or the like is outputted to a facsimile or the like having a different output format, to obtain the same output result as when outputting with a laser printer or the like. .

[Conventional technology]

There is a desire to send the same data that a computer outputs to a printer to a facsimile (FAX) and obtain output results similar to those outputted by a printer.

FIG. 2 shows a block diagram for performing the above. Character data is output from the computer 1 to a printer (laser printer) 4 through a channel 2 and a control device 3. On the other hand, from the computer 1, a communication control device (CCP) 5, a facsimile connection device (CFC) 6,
Character data is output to the FAX 8 through the public network 7.

Since FAX only has the function of outputting a black and white dot pattern, the text can be converted into a dot pattern as shown in Figure 2.
This will be done at CFC.

FIG. 3 shows an example of output from the laser printer 4.

The laser printer 4 prints characters in a dot pattern within the document output area shown in FIG. 3 at a pixel density of 240 dots/inch. The document output area is centered horizontally on the paper.
Output at 1848 dots (7.7 inches) and 2640 dots vertically (11 inches).

Figure 4 is an enlarged view of a part of the character area in Figure 3, and is an example of outputting 8 cpi and 10 cpi characters with a line spacing of 6LPI (40 dots). 30× for 8cpi characters
A 28 x 28 dot letter face is placed in the position shown in the figure within a 40 dot character body ace, and in the case of 10 cpi characters, a 20 x 24 dot letter face is placed in the position shown in the 24 x 40 dot body ace. be placed in the position of

[Problem that the invention seeks to solve]

If you try to output the same output as the output example in Figure 3 to a fax, the following problems will occur.

(a) A laser printer with a pixel density of 8 dots/mm horizontally (main scan) and 7.7 dots/mm vertically (sub scan)
The size is 240 x 240 dots/inch, and the aspect ratio is different.

(b) If a dot pattern corresponding to FIG. 3 is created and then thinned out at the above pixel density ratio, the character pattern will be destroyed.

Because of these problems, conventional printers
Fax output formats were not matched.

[Means for solving problems]

The present invention provides an image data processing device configured to write data to an image memory under the control of an image memory controller that creates an access address to the image memory, and another device that handles data with a different pixel density. In a character output control method for outputting a document similar to a document outputted as characters to the image data processing device, the origin (X0,
Y0) and the origin of the letterface (X2,
Y2) is expressed by the pixel density of the image data processing device, the origin of the character body face (X1, Y1) is expressed by the pixel density of the other device, and the pixel density of the other device and the image data processing device is expressed. The output position (X, Y) of the character letter face on the image memory to be passed to the image memory controller
is determined by formula (1) X=X0+αX1+X2 Y=Y0+βY1−Y2 or formula (2) X=X0+αY1−Y2 Y=Y0−βX1−X2 according to the output format, and the obtained character letterface is output. The apparatus is configured to output a character having a size corresponding to a predetermined image data processing apparatus stored on the image memory at a position (X, Y).

[Effect]

According to the present invention, when an attempt is made to output a document similar to a document outputted to a printer etc. to a fax etc.,
The address of the document origin (X ₀ , Y ₀ ) and the origin of the character letterface (X ₂ , Y ₂ ) are expressed in a space such as 8×7.7 dots/mm, and the origin of the character bodyface (X ₁ ,
Y ₁ ) is expressed in a space of 240×240 dots/inch, etc., and the output position (X, Y) for each character is determined by the above equation (1) or equation (2).

By doing this, you can connect the printer etc.
It becomes possible to match output formats such as fax.

〔Example〕

FIG. 1 is a diagram showing the configuration of a facsimile connection device (CFC) according to an embodiment of the present invention.

In the figure, 6 is a facsimile connection device (CFC), 7
is a public network, 8 is a fax machine, 10 is a computer, 11 is a microprocessor (MPU), 12 is a computer interface, 13 is a fax interface, 1
4 is a memory, 15 is a character pattern generator, 16 is an image memory controller, 17 is a compressor, 1
8 is an image memory. The CFC 6 is controlled by an MPU (microprocessor) 11. Character data from the computer 10 is stored in the memory 14 of the CFC 6 through the computer interface 12.

The image memory (IM) 18 stores the dot pattern data of the document to be output to the FAX 8. When outputting a document with paper size (A) 4, the image memory (IM) 18 is composed of 1728 dots horizontally x 2286 dots vertically. This is the memory of the bitmap.

FIG. 5 shows the configuration of the image memory.

Access to the image memory 18 is controlled by an image memory controller (IMC) 16.
Figure 6 shows the configuration of the IMC.

The IMC performs control to access a rectangular area on the image memory as shown in FIG. 7 while scanning it in the horizontal direction (X direction).

That is, XAR20 and YAR21 are address registers that address dot positions on the image memory, and each time one dot (one bit) is accessed, XAR20 is incremented by one.

XARR22 is a register used to return to the left end position one line below when the right end is reached while horizontally scanning a rectangular area.

XDOT23 is a horizontal dot counter in a rectangular area, and XDOT23 counts down to 0.
When it becomes XARR22 → XAR20, YAR2
1+1 and XDOTR24 → XDOT23, YDOT
25-1 is performed.

YDOT25 is a vertical dot counter,
When this counter reaches 0, access to the rectangular area ends.

The character pattern generator 15 is composed of a memory that stores character patterns such as Chinese characters in the form of dots, and when one character code is given, the dot pattern of the corresponding character is outputted and written in the character position of the image memory. Note that the size of the characters to be output on the facsimile written in the image memory is specified under the control of the MPU. That is, the present invention does not perform pixel density conversion on characters output by the printer;
The input character code is converted into a character pattern of any size and stored as is in the image memory.

The compressor 17 converts the contents of the image memory 18 into
This is a device that compresses and encodes using the MH/MR method.

Image memory access during compression processing is performed by IMC
16, and the entire image memory shown in FIG. 5 is accessed as one rectangular area.
This is read out one dot at a time in the X direction starting from the top row (YAR=0), and when the first row is completed, the second row is read out in the X direction, and then sequentially in the Y direction.

The data compressed and encoded by the compressor 17 is stored on the memory 14.

The compressed data stored in the memory 14 is faxed
Fax through interface 13 (G3FAX)
8 is output.

In the above CFC, in order to output a document similar to the printer output shown in FIGS. 3 and 4 to a FAX, the following control is performed. The explanation is based on the case of outputting in portrait format on A4 paper.

As mentioned above, the character output area of the printer is 1848×
2640 dots, and the corresponding printing area on the fax machine has a pixel density of 8 x 7.7 dots/mm.
Therefore, it becomes 1565 (horizontal) x 2151 (vertical) dots. The output paper size for fax (A)4 is 1728
×2286 dots, so if you bring this print area to the center of the paper, the values of (X ₀ , Y ₀ ) will be (82,
68) dot position. FIG. 8 shows the positional relationship when the print area is placed on the image memory.

When the character output position on the printer (the lower left end position of the character body face) is (X ₁ , Y ₁ ), the character output position on the image memory is also set at (X ₁ , Y ₁ ). ((X ₁ Y ₁ ) takes the upper left corner of the character output area as its origin.) (X ₁ Y ₁ ) uses the printer's position address as is, so
This is an address in a pixel density space of 240 dots/inch.

Character output position in image memory (X ₂ ,
Y ₂ ) indicates the upper left end point of the character letterface when the character output position (X ₁ , Y ₁ ) is the origin.
(X ₂ , Y ₂ ) are values at the pixel density of the image memory space (8×7.7 dots/mm).

FIG. 9 shows character output positions on the image memory corresponding to the character output position relationship of the printer shown in FIG. 4.

240 dots/inch = 9.4488 dots/mm,
If the ratio between 240 dots/inch and 8 x 7.7 dots/mm is α=8/9.4488, β=7.7/9.4488, the character letterface output position (X, Y) in the image memory is X=X ₀ + αX ₁ +Y ₂ Y=Y ₀ +βY ₁ −Y ₂ (Formula 1).

In addition _, in the case of the horizontally long output _format shown in FIG _. 10, it can _be determined _as follows _:

In this way, (X ₀ , Y ₀ ) and (X ₂ , Y ₂ ) are expressed as dot addresses in the image memory of 8×7.7 dots/mm, and (X ₁ , Y ₁ ) are expressed as 240×240 dots/inch. Expressing it as a system has the following advantages.

Characters and lines can be incremented using integers, increasing the accuracy of character output positions.

The fact that the pixel density of FAX is 8 x 7.7 dots/mm, which is different in the vertical and horizontal directions, can be covered by only the correction of (X ₁ , Y ₁ ), making control easier.

〔Effect of the invention〕

According to the present invention, when outputting characters similar to those of a document outputted by another device that handles data with different pixel densities, it is possible to output characters accurately without deteriorating the image quality. The effects of this are significant.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a facsimile connection device according to an embodiment of the present invention, FIG. 2 is a diagram showing the output format of character data, FIG. 3 is a diagram showing an example of printer output, and FIG. 4 is a diagram showing the character data output format. 5 is a diagram showing the configuration of the image memory, FIG. 6 is a diagram showing the configuration of the image memory controller, and FIG. 7 is a diagram explaining scanning of the image memory.
FIG. 8 is a diagram showing the positional relationship between the printer and the image memory, FIG. 9 is a diagram showing the character output position on the image memory, and FIG. 10 is a diagram showing the output format in the case of landscape orientation. In FIG. 1, 11 is a microprocessor;
14 is a memory, 15 is a character pattern generator, 16
is an image memory controller, 17 is a compressor,
18 is an image memory.

Claims (1)

[Claims] 1. An image data processing device configured to write data to an image memory under the control of an image memory controller that creates an access address to the image memory handles data with a different pixel density. In a character output control method for outputting a document similar to a document outputted as characters by another device to the image data processing device, a character output area of the image memory is selected from among the character data of the characters output by the image data processing device. The origin (X0, Y0) of the character letter face (X2, Y2) is specified by the pixel density of the image data processing device, and the origin (X1, Y1) of the character body face is specified by the pixel density of the other device. only with respect to the origin of the character body face specified by the pixel density of the other device, the predetermined vertical and horizontal ratios α and β of the pixel densities of the other device and the image data processing device. The output position (X, Y) of the character letter face on the image memory to be passed to the image memory controller is calculated using the following equation: X=X0+αX1+X2 Y=Y0+βY1−Y2 or equation (2): X=X0+αY1 -Y2 Y = Y = Y0 - βX1 - A character output control method characterized by outputting characters having a certain size.