JPH0752338B2 - Graph output control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] Graph data output to a printing device (printer) having a certain pixel density and the origin of a document output area has different pixel densities has an origin of the document output area. The graph data including the straight line that should be output to the printing device whose origin of the document output area is automatically determined is set to pixel An image for controlling an output device in which the density has different values such that α and β are ratios in the x direction and the Y direction with respect to the pixel density of the printing device, and the origin of the document output area is determined at the time of drawing. When the data is input to the data processing device and is then stored in the image memory via the graph pattern generation device under the control of the microprocessor in the image data processing device, the image memo of the image data processing device. Document output area of the origin (X _0, Y _0), the center of the document output range is determined so as to substantially coincide with the center of the document output area by the printing apparatus, the origin of the address image data processing device The address (X, Y) of the linear end in the graph data in the document output area in the image memory of the image data processing device is represented by the pixel density, and the address Xi at the pixel density of the printing device is For Yi, the straight line end determined by the equation (1), X = X ₀ + αXi, Y = Y ₀ + βYi or the equation (2), X = X ₀ + αYi, Y = Y ₀ −βXi, and thus determined Make sure a straight line is formed between them. As a result, a graphic similar to the graphic drawn by the printer can be output by a facsimile machine or the like.

[Industrial application field]

The present invention provides a graph output control method for obtaining the same output result as when output by a printer such as a laser printer when the graph data created for a printing device such as a laser printer is output to a facsimile machine having a different output format. Regarding

[Conventional technology]

It is necessary to send the same data that a computer outputs to a printer (printer) to a fax machine (FAX) and obtain the same output result as that output to a printer.

FIG. 2 shows a block diagram for performing the above.

Graph data is output from the computer 1 to the printer (laser printer) 4 via the channel 2 and the control device 3. On the other hand, communication control unit (CCP) from computer 1
5, graph data is output to the FAX 8 which is an output device via the facsimile connection device (CFC) 6 as an image data processing device and the public network 7.

In FAX, the origin of the document output area must be determined when outputting, and since the only function of monochrome dot pattern output is to determine the origin of the document output area and graph dot patterning, use CFC6 in Fig. 2. Become.

FIG. 3 shows an output example when the laser printer 4 outputs.

Laser printer 4 has a pixel density of 240 dots / inch
The graph is printed in a dot pattern in the document output area. The document output area is automatically determined by the printer together with the origin, and for example, it is output at the center of the paper with horizontal 1848 dots (7.7 inches) and vertical 2646 dots (11 inches).

The graph data is addressed in a coordinate space having a pixel density of 240 dots / inch with the upper left end of the document output area in FIG. 3 as the origin. For example, as shown in FIG.
When drawing a circle with a radius of 3 cm centered at 5 cm from the left and 5 cm from the left, the center (Xr, Yr) is (472 dots, 945 dots) and the radius R is 283 dots. When a square with a side of 5 cm is drawn as shown in FIG. 3, straight line ends X ₁ and Y ₁ are (283 dots, 1417 dots), and X ₂ and Y ₂ are (756 dots, 1417 dots).

For example, when drawing a square consisting of sides parallel to the X and Y directions with a side of 5 cm as described above, first the address that is the starting point
X ₁ and Y ₁ are decided.

In the above example, X ₁ = 283 dots, Y ₁ = 1417 dots, 5 cm
Is equivalent to 473 dots, so x = 4 for such X ₁ and Y _1.
73 dots, y = 0 dots are given, X ₂ (756 dots) and Y ₂ (1417 dots) are determined, and in this way X ₁ ,
A straight line between Y ₁ and X ₂ and Y ₂ is drawn by the DDA method, for example.

Next, x = 0, y = 473 dots are given starting from X ₂ and Y ₂ , X ₃ (756 dots) and Y ₃ (1890 dots) are determined, and a straight line between both ends is drawn. X _3, x = -473 dots Y ₃ starting, y = 0 is given, X ₄ (283 dots), Y ₄ (1650 dots) are determined, it is drawn straight across. X = 0, y = -473 dots are given to these X ₄ and Y ₄ , and a straight line to the starting point is formed, and a square of 5 cm on each side is completed.

[Problems to be solved by the invention]

When the same output example as shown in Fig. 3 is to be output by FAX, the pixel density differs between the printer and FAX, so the graph data to be output by the printer is multiplied by the horizontal and vertical ratios α and β of the pixel density. Graph data to be output by FAX will be calculated.

However, with the address data calculated by this, the square corresponding to the square by the printer in FIG.
When you draw with X, it looks different than the square on the printer.

That is, in the above example, the square drawing start points X ₁ , Y ₁
On the FAX becomes αX ₁ , βY ₁ multiplied by the pixel density ratio, that is, X ₁ ′, Y ₁ ′, but this pixel density ratio usually has a value after the decimal point, and the value after the decimal point is truncated. If it is not drawn, it will not be able to be drawn, so the converted address X on FAX
₁ ′ and Y ₁ ′ are not in the same position as X ₁ and Y ₁ .

Starting the X ₁ ', Y _1', it from X ₂ ', Y _2' to a value x ', y' is given, X ₂ ', Y _2' straight up is drawn. In this case, x ′ and y ′ are also based on the pixel density ratio,
There is an error associated with truncating numbers below the decimal point, so
The positions of X ₂ ′ and Y ₂ ′ are different from the positions of X ₂ and Y ₂ .

Then the X ₂ ', Y _2' from x ', y' by the value of the given, X ₃ ', Y _3' is a straight line drawn up,
Since the positions of X ₂ ′ and Y ₂ ′ are already different from the positions of X ₂ and Y ₂ , the positions of X ₃ ′ and Y ₃ ′ are also different from the positions of X ₃ and Y _3. .

Next, x ', y'is given from this X ₃ ', Y ₃ 'as the starting point,
When a straight line to X ₄ ′, Y ₄ ′ is drawn, this position is different from X ₄ , Y _4, and when x ′, y ′ is given starting from that position and a straight line is drawn, the end point of that straight line Does not match X ₁ ′ and Y ₁ ′.

That is, multiply the address data of the graph by the ratio of pixel density
When the address of the graph data on the FAX is calculated, the error after the decimal point due to the multiplication of the ratio is accumulated, and when the complicated graph pattern is drawn, it becomes completely different from the output figure on the printer.

If an image corresponding to the dot pattern in the printer of FIG. 3 is created and thinned out at the ratio of the pixel density, the image quality of the graph pattern will be deteriorated.

[Means for solving problems]

According to the present invention, the above-mentioned problem is solved by the present invention, in which graph data including a straight line to be output to a printing device whose origin of a document output area is automatically determined has pixel density in the x direction and the y direction with respect to the pixel density of the printing device. In the image data processing device, the origin of the document output area is input to the image data processing device that controls the output device that has different values such as α and β. Then, when the data is controlled by the microprocessor and stored in the image memory through the graph pattern generator, the origin (X ₀ , Y ₀ ) of the document output area of the image memory of the image data processor is the center of the document output area. Is determined so as to substantially coincide with the center of the document output area of the printing device, and the address of the origin is represented by the pixel density of the image data processing device. Address in straight edge in the graph data in the document output region in Jimemori (X, Y), the address of the pixel density of the printing apparatus Xi, to Yi, Formula _{(1), X = X 0} + αXi, Y = Y ₀ + βYi or equation (2), X = X ₀ + αYi, Y = Y ₀ −βXi, and a straight line is formed between the straight line ends thus determined. Will be solved by.

[Action]

According to the present invention, a graph pattern similar to the graph pattern formed by combining a plurality of straight lines output to a printer is
When attempting to output to X or the like, the origin of the document output area is determined so that the center of the document output area substantially coincides with the center of the document output area by the printing device (printer), and its address (X ₀ , Y ₀ ) is the pixel density of the image data processor, that is, F
If AX is an output device, it is represented in the image memory space with a pixel density of 8 dots / mm in the x direction and 7.7 dots / mm in the y direction, and the addresses (X ₁ , Y ₁ ) and (X _{2 of the} vector representing the graph are represented. , Y ₂ )
, Etc. are expressed by 240 × 240 dots / inch (9.4488 dots / mm), which is the pixel density of the printing device, then the address is converted by the above formula (1) or formula (2), and a combination of multiple straight lines is obtained. All points are determined by the formula (1) or (2), and a straight line between the two determined points is drawn.

This makes it possible to draw by FAX an output figure that is approximately the same as the output figure on the printer, except for the error points due to α and β at each connection point itself. Also, when a horizontally long document output area is used in FAX, Xi and Yi in the case of vertically long document can be used as they are and the address can be determined according to the above equation (2).

By doing so, an accurate graph can be output without causing an error in the address calculation.

〔Example〕

FIG. 1 is a diagram showing the configuration of a facsimile connection device (CFC) 6 as an image data processing device according to one embodiment of the present invention.

When the FAX8 as an output device draws a graph, the origin of the output area of this CFC is determined so that the center of the document output area is substantially coincident with the center of the document output area by the printing device, and its address is It is determined by the pixel density of the image data processing device and has the function of dot patterning the graph. 7 is public network, 8 is FA as output device
X, 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 graph pattern generator, 16 is an image memory controller, 17 is a compressor, and 18 is an image memory.

The CFC 6 is controlled by the MPU (microprocessor) 11.

Graph data from computer 10 is computer interface
It is stored in the memory 14 of the CFC 6 via 12.

The image memory 18 is a bitmap memory, and FAX8
This is a place to store the dot-patterned data of the document to be output to, and when outputting a document of A4 paper size,
It consists of 1728 dots and 2286 dots vertically.

As a method of drawing a straight line on the image memory 8 which is a bitmap memory, a digital differential
A method called an analyzer (DDA) method is well known.

Using this DDA method, from point A (0, 0) to point B (Xi, Y
The case of drawing a straight line in i) will be described with reference to FIG.

When Δx and Δy are plotted on the figure, the relationship between ΣΔy and Δx / 2 is as follows.

That is, when ΣΔy ≧ Δz / 2 (1), X + 1 is stored in the register that stores the value of X, and Y + 1 is stored in the register that stores the value of Y.

In this case, the new ΣΔy is a value obtained by adding Δy to the previous ΣΔy and subtracting Δx from it.

When ΣΔy <Δx2 (2), X + 1 is stored in the register that stores the value of X, and the value of the register that stores the value of Y remains unchanged.

And the new ΣΔy in this case is Δ
Let y be the added value.

Under these conditions, further, for example, Y / X = 6/10, and in the figure, the scale in the x direction is Δx, and the DDA method will be described.

First write a dot at point A (0,0).

As ΣΔy, an initial value is set at the p point on the Y axis as shown in the figure. In this case, since Δy = 0.6Δx, in the above conditional expression, ΣΔy = Δy = 0.6Δx, which corresponds to the condition (1).

Therefore, a dot is written at point a on the figure as X + 1 and Y + 1.

In the case of conditional expression (1), a new ΣΔy is ΣΔy =
Since Δy + Δy−Δx, the point q is ΣΔy == 0.2Δx. Since this corresponds to the conditional expression (2), a dot is written at a point of X = 2 and Y = 1, that is, a point b.

In this case, the new ΣΔy according to the conditional expression (2) is ΣΔy = 0.2Δx + Δy = 0.8Δx.

Since this corresponds to the conditional expression (1), a dot is written at a point of X = 3 and Y = 2, that is, a point C.

Similarly, dots are written based on the conditional expressions (1) and (2).

Further, in this case, since Δx and Δy are minute values, the continuity of each dot point is represented by being approximated to the straight line between A and B.

In this way, an example of drawing a straight line between AB in FIG. 7 according to the present invention will be described. In FIG. 1, a graphic command is input from the computer 10 to the memory 14 of the CFC 6.

That is, a graph command indicating a straight line, line type information indicating a solid line, an address indicating X ₁ at point A, an address indicating Y ₁ at point A, an address indicating X ₂ at point B, an address indicating X ₂ at point B, which is the address of the printer. An address indicating Y ₂ is input.

By inputting the address of the point A and the point B indicated by the address of the printer, the MPU 11 makes the center of the image memory correspond to the center of the image memory and faxes.
The address of the origin above is determined, and the pixel density ratio α,
Calculate β.

That is, the printer has a pixel density of 240 dots / inch (9.448
8 dots / mm), and 8x / mm in the x direction and y in the fax.
Since the direction is 7.7 dots / mm, x between the printer and FAX
The ratio of the pixel densities in the direction and the y direction is as follows: x direction: α = 8 / 9.4488 = 0.84667 y direction: β = 7.7 / 9.4488 = 0.81492, which is stored in the memory 14.

In the example of FIG. 7, the document output area on the left side of the drawing is 1848 dots horizontally and 2646 dots vertically as in the case of FIG. 3, and the document output area of the same size is FAX.
Using the pixel density ratios α and β above on the right side of the figure, the result is 1565 dots in the horizontal direction and 2151 dots in the vertical direction. Since the size of paper A4 is 1728 dots in the width 216 mm and 2286 dots in the height 297 mm, if you align the center of the document output area of the fax with the center of the document output area of the printer on the left side of the figure Since the spacing between the left and right blank areas and the top and bottom blank areas of the document output area are equal, the origins X ₀ and Y ₀ of the FAX document output area are X ₀ = 82 and Y ₀ = 68.

Also, the above X ₁ , Y ₁ and
Based on X ₂ and Y ₂ , the MPU performs the following calculation and stores it in memory.

X ₁ ′ = X ₀ + αX ₁ Y ₁ ′ = Y ₀ + βY ₁ X ₂ ′ = X ₀ + αX ₂ Y ₂ ′ = Y ₀ + βY _{2 According} to the calculation result, the DDA method based on FIG. 4 is explained. The differential value Δx of the differential value Δx (Y ₂ ′ -Y ₁ ′) of (X ₂ ′ -X ₁ ′) is obtained.

In an actual device, Δx and Δy are replaced by a value of (X ₂ ′ -X ₁ ′) and a value of (Y ₂ ′ -Y ₁ ′) to obtain Δ
Used as x and Δy, the comparison between ΣΔy and Δx / 2 is performed for each clock signal corresponding to the unit scale of FIG. 4, for example. In this case, this (X ₂ ′ -X ₁ ′), (Y ₂ ′-
Y ₁ ′) has a proportional relationship with the above-mentioned differential values Δx and Δy. Therefore, X + 1, Y + 1 or X + 1, Y in the DDA method will be used.
+0 can be output from the graph pattern generator.

The values of Δx and Δy are the graph pattern generator 15 of FIG.
Entered in. And this graph pattern generator 1
Although an example is shown in FIG. 5 as a vector generator, the image memory 18 in the figure is controlled by the address stored in the address registers XAR25 and YAR26, and a 1-bit "1" is stored as a dot at that address position. The address register receives the information from the memory 14 under the control of the MPU in FIG. 1 and the output from the VG controller as shown in FIG. And address register XA
The addresses X ₁ ′ and Y ₁ ′ of the point A from the memory 14 based on the result previously calculated by the control from the MPU are input to R 25 and YAR 26, whereby the position of X ₁ ′ Y ₁ ′ is stored in the image memory. The dot is stored in.

ΔX20, ΔY21, and ΣΔY22 are 12-bit registers.

The ALU23 is a 12-bit wide arithmetic unit having the function of ADD / SUB / COMP. In this case, Δx is input from Δx20, Δx / 2 is also input to the ALU23, and Δy is input from Δy21. The output from the ALU is then set to ΣΔy22. Furthermore, the other output of the ALU 23 is output to the VG controller 24 as a 1-bit signal indicating the comparison result of ΔX / 2 and ΣΔY.

Also, the VG controller 24 is based on the comparison result of ALU23.
It controls the updating of the X, Y address registers 25, 26 (XAR, YAR) and also controls the updating of ΣΔY22.

The vector dot expansion into the image memory 18 is performed by writing 1-bit "1" data in the updated positions of XAR25 and YAR26.

That is, Δz and Δy from MPU are register Δx20 and register Δx20.
It is stored in y21 and its value is input to ALU23, and Δx20
As described above, Δx / 2 is also input to ALU23 from.

In ALU23, ΣΔy = Δy and Δx / 2 can be compared.

When ΣΔy = ≧ Δx / 2, X + 1 and Y + 1 are input to the VG controller, which is XA
Stored in R25 and YAR26.

In this case, ΣΔy22
A value obtained by adding Δy to the previous ΣΔy and subtracting Δx is input as a new ΣΔy, and the new ΣΔy and Δx / 2 are compared.

When ΣΔy <Δx / 2, X + 1 and Y + 0 are input to the VG controller, which is XA
It is stored in R25 and YAR26.

In this case, the VG controller 24 controls ΣΔy2
A value obtained by adding Δy to the previous ΣΔy is input to 2 as a new ΣΔy, and this new ΣΔy and Δx / 2 can be compared.

Then, such control is performed until the point B (X ₂ ′, Y ₂ ′) is reached as described above.

FIG. 6 shows the control state of the VG controller 24.

S1: ALU23 compares ΔX / 2 and ΣΔY. The image memory 18 is controlled by the MPU as described above.
The address of point A (X ₁ ′, Y ₁ ′) is given from AR 25 and YAR 26, and 1 is written at that position, and dot storage is performed.

S2: ΣΔY = ΣΔY + ΔY is performed by the ALU23. Further, XAR + 1 and YAR + 1 are set according to the comparison result ΣΔy ≧ Δz / 2 in S1.

Since S3: ΣΔy ≧ Δx / 2, the new ΣΔy is as follows.

ΣΔy = ΣΔy−Δx The steps S1 to S3 are repeated in the same manner.

The compressor 17 uses the contents of the image memory 18 as AH for FAX output.
This is a device that performs compression encoding by the MR system, and the compression encoded data is stored in the memory 14 and then output to the FAX 8 through the FAX interface 13.

In the above CFC, the following control is performed in order to output the same document as the printer output shown in FIG. 3 to the FAX. Note that the explanation will be given for the case of vertically outputting on A4 paper.

The document output area of the printer automatically becomes, for example, 1848 × 2646 dots due to the mechanism of the printer as described above, and the corresponding document output area on the FAX has a FAX pixel density of 8 in the x direction.
Since the dot / mm is 7.7 dots / mm in the y direction, the document output area is 1565 (horizontal) × 2151 (vertical) dots. FAX A
The output paper size of 4 is 1728 × 2286 dots, so if you bring this document output area to the center of the paper, the value of the origin (X ₀ , Y ₀ ) of the document output area will be (82,68) as described above. ) Dot position.

FIG. 7 shows the positional relationship when a FAX document output area is placed on the image memory.

Set the graph output position on the printer to (X ₁ , Y ₁ ), (X ₂ ,
When Y ₂ ) is set, the addresses when developing the image memory for the printer are also set to (X ₁ , Y ₁ ), (X ₂ , Y ₂ ), respectively. Since X ₁ , Y ₁ , X ₂ , and Y ₂ use the position address of the printer as they are, the address has a pixel density of 240 × 240 dots / inch.

The pixel density of 240 dots / inch in the printer is 9.4488 dots / mm, and the ratio between the pixel density of 240 dots / inch in the printer and the pixel density of 8 x 7.7 dots / mm in FAX is
For x, α = 8 / 9.4488, for y, β = 7.7 / 9.4488
Becomes

Therefore, A on the image memory in FIG. 7 for FAX
The addresses of point and B are Is required as.

Further, in the case of the horizontally long output format by the printer shown in FIG. 8, the X and Y axis directions correspond to those indicated by the arrows in the upper left of the right diagram of FIG. 7, and in the upper right of the right diagram of FIG. Shows.

That is, when printing a horizontally long document output area on a printer horizontally by fax, the vertical direction is the x direction as shown in the right figure of FIG.
The horizontal direction is the y direction, and printing is performed from the right end in the x direction to the bottom in the right direction in FIG.

Thus X ₁ in FAX 'to Y ₁ of the printer, Y _1' corresponding respectively to X ₁ of the printer.

Then X _0, Y ₀ is represented by a pixel density of the image data processing device as in the seventh figure, it becomes as shown in Figure 8, the X _0, Y
_{Below the 0} point is the x direction, and the right direction is the -y direction.

Also, since the x direction is α and the y direction is β, Is required as.

In this way, (X ₀ , Y ₀ ) is expressed by the dot address of the 8 × 7.7 dot / mm type image data processing device, and (X ₁ , Y ₁ ) (X ₂ , Y ₂ ) is 24
In the present invention, the address of each connecting point of a plurality of straight lines is determined in advance by the formula (1) or the formula (2), and then the straight line between the connecting points is drawn. . For this reason, the position of the connection point is based on α and β, and an error occurs with the position of the output graphic of the processor, but an output graphic that is approximately equal to the output of the printer can be drawn by FAX.

Further, even when the document output area is horizontally long as described above, Xi and Yi can be used as they are, and the address is determined by the equation (2).

That is, the addresses at the points A and B are not affected even if the output format to the FAX is vertically long and horizontally long, and the calculation of formula 1 or formula 2 may be performed only when creating the graph pattern, and the control becomes easy.

〔The invention's effect〕

According to the present invention, when a document similar to a document that is graph-output by another device that handles data of different pixel densities is output, it is possible to output accurately without degrading image quality, and its practical effect. Is big.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a facsimile connection device of an embodiment according to the present invention, FIG. 2 is a diagram showing an output form of graph data, FIG. 3 is a diagram showing an output example of a printer, and FIG. 4 is a DDA. Fig. 5 is a diagram for explaining the method, Fig. 5 is a diagram showing a vector generator as an example of the graph pattern generator in Fig. 1, Fig. 6 is a diagram showing control states of the VG controller, and Fig. 7 is a vertically long image. FIG. 8 is a diagram showing a positional relationship in the case of, and FIG. 8 is a diagram showing a positional relationship in the case of a horizontally long case. In FIG. 1, 11 is a microprocessor, 14 is a memory, 15 is a graph pattern generator, 16 is an image memory controller, 17 is a compressor, and 18 is an image memory.

Claims (1)

[Claims] 1. A graph data including a straight line to be output to a printing device in which the origin of a document output area is automatically determined, in which the pixel density is a ratio in the x and y directions to the pixel density of the printing device. The origin of the document output area has different values such as α and β and is input to the image data processing device that controls the output device that is determined at the time of drawing. At that time, a microprocessor is used in the image data processing device. When the data is controlled and stored in the image memory via the graph pattern generator, the origin (X ₀ , Y ₀ ) of the document output area of the image memory of the image data processing device is the center of the document output area depending on the printing device. The address of the origin is determined so as to substantially coincide with the center of the document output area, and the address of the origin is represented by the pixel density of the image data processing device. Address (X, Y) of the graph data in the linear end of the force region, the address Xi of the pixel density of the printing apparatus, to Yi, Formula _{(1), X = X 0} + αXi, Y = Y 0 + βYi Alternatively, a graph output control method characterized in that a straight line is formed between straight line ends determined by the equation (2), X = X ₀ + αYi, Y = Y ₀ −βXi, and thus determined.