JPS5939158A - Converter of picture power - Google Patents

Abstract

PURPOSE:To improve the efficiency of a print and photoengraving process by controlling the size of an output picture and aspect ratio with the processing of picture data to be inputted, without changing the operating condition of an output plotter, in a picture data output plotter. CONSTITUTION:A converter 1 processes a picture data DI for each scanning line in response to the preset power deletes a picture data for scanning line's share in reaching the prescribed scanning line or increases >=1 scanning line. Every time the picture data for one scanning line's share is inputted to attain the discrimination, the power is added sequentially, the part less than the decimal point of the integrated value is added again with the power and the integer part K is checked. When the integer part K is >=2, (K-1)-line picture data are added in succession to the picture data for one scanning line's share, and when the integer part K does not reach 1, the picture data inputted for the case is delected and the output is attained from the picture data inputted next. Thus, the size and the aspect ratio of the reproduced picture are controlled by having only to process the input picture data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-image data output plotter such as a printing plate-making scanner or a flying Φ spot scanner, in which the output image size can be arbitrarily controlled only by electrical processing of image data. The present invention relates to an image data processing device ff.

In such image data output plotters, such as scanners for printing plate making, etc., the output pixel pitch in the main scanning direction and the big in the sub-scanning direction, that is, the output scanning line pitch, are appropriately selected, or the ratio thereof is adjusted. By appropriately selecting , it should be possible to obtain an output image of any size and any aspect ratio from the same image data, and to perform plate-making operations efficiently.

However, in conventional printing plate-making scanners, etc., which have been commonly used, the pitches of each pitch and their ratio are set to one type, or several grams! In most cases, the image size is limited to a certain size, and therefore, such conventional printing plate-making scanners have the disadvantage of not being able to output images of any size or aspect ratio. Ta.

An object of the present invention is to eliminate the drawbacks of the prior art described above, and to be able to arbitrarily control the size and aspect ratio of an output image without changing the output pixel bit or output scanning line pitch of a scanner for printing plate making, etc. An object of the present invention is to provide an image magnification conversion device useful for improving efficiency in printing plate-making work.

In order to achieve this object, the present invention is characterized in that at least one of the orifices is provided.

Embodiments of the image magnification conversion device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration when the image magnification conversion device according to the present invention is applied to a scanner for printing plate making, where 1 is the image magnification conversion device according to the present invention, 2 is a digital/analog converter ( )/A), 3 is an r correction circuit, and 4 is an exposure scanner.

In this example, digital image data I) is read out from a memory, inputted, and exposed using a scanner.

The image magnification converting device 1 (hereinafter simply referred to as the converting device) functions to process the image data (I) sequentially in units of scanning lines, and to increase or decrease the number of scanning lines in accordance with the magnification of the output image.

D/A2 functions to convert the image data DI/ from the converter l into analog image data AI, and at this time
The pitch of output pixel data in the main scanning direction is determined by the period of the reproduced clock at /A2.

In order to correct the characteristics of the film on which the output image is exposed, the r correction circuit 3 functions to output analog data A I/ which has four predetermined non-linear characteristics with respect to the input analog data A.

The scanner 4 functions to expose the input analog image data A1/ at a predetermined scanning line pitch to obtain an exposure method film for plate making.

Therefore, D/
If you change the period of the reproduced clock in A2,
Image data per scanning line in scanner 4 A I/
By changing the exposure length and the number of scanning lines, the size of the output image can be arbitrarily controlled without changing the pure scanning pitch of the scanner 4, and a printing plate of any required size can be obtained.

Next, one embodiment of the conversion device 1 will be described.

As described above, this conversion device 1 processes the image data DI for each scanning line according to a preset scaling factor, and removes image data for one scanning line each time a predetermined scanning line is reached. , or increase the number of lines by one or more.

In the embodiment described below, it is practical to use this magnification ratio in the range of about 0.5 times to 2.0 times around 1 times, and at this time, the above-mentioned predetermined scanning In order to judge whether to increase or decrease the image data for one scanning line when the line is reached, the scaling factor (this is referred to as it) is sequentially added each time the image data for one scanning line is input. , the magnification ratio R is added again to the part K below the 9th decimal point of the cumulative value (this is called Q), and the integer part of this addition result (this is called K) is examined.
When this integer part K becomes 2 or more, (K-1) lines of image data are added following the 1 scanning line of image data that was input at that time, and the integer part K does not reach IK. When this happens, the image data for one scanning line that was input at that time is removed and the stroke data for one scanning line that is input next is output, so that the magnification is adjusted accordingly to the output image data. The number of scanning lines is increased or decreased by 11.5J゛5.

Now, FIG. 2 shows one embodiment of the conversion device l, and 10.11.
14 is a switching gate, 12.13 is a first and second two in-buffers, 15 is a buffer register, 16 is a scaling factor register, 17 is a subtraction store, 18.29 is an adder, 19.2
3 is a comparator, 20 is a counter control unit, 21 is a counter,
22 is a clock generator, 24 is a transfer counter, 25 is a lock control section, 26 is an output control section, 27.28 is a multiplier, 30.31 is a coefficient setting section, 32 is a differentiator, 33
is an OR gate.

Switching games) 10 and 11 are switched and controlled by a control signal l supplied from a clock control section 25, and are controlled by human power 1, respectively.
A switching operation is performed between an input mode in which input 2 is connected to output O, and a circulation mode in which input 2 is connected to output 0.

Line buffers 12 and 134? , operated by the shift clock m from the clock control unit 25, and the switching gate 1o.

When 11 is in the input mode, image data l) I is input from the input terminal, and when it is in circulation mode, the input image data DI are input to the multipliers 27 and 27, respectively.
In addition to outputting the data to 28, it also functions to input and hold the output data again. Note that in the input mode, the image data DI from the input terminal is first input to the second line buffer 13;
Since the output of the first σ, ) is input to the line buffer 12, when the data of the scanning line consisting of the image data I) 1 is stored in the second line buffer 13, the first line buffer This means that the data of the scanning line before the line is stored.

The switching gate 14 is controlled by the output j of the comparator 19, and connects the input 1 to the output O when the output j is '0'';
When the output j is '1', it serves to connect the input 2 to the output O.

The buffer register 15 functions to latch the output data of the adder 18 based on the output of the OR gate 33 and output it.

The magnification ratio R is set in advance in the magnification register 16 by a signal supplied from the input l, and the magnification ratio I is always set at the output f.
It functions to output t.

Data representing "-1" is stored in advance in the subtraction storage 17, and serves to always generate "-1" as output 1.

The adder 18 functions to add the output of the switching gate 14 and the output of the back 7 register 15 and supply the result to the input of the buffer register 15 again.

The comparator 19 compares the data I' held in the buffer register 15 with the data "1" and generates an output j when P≧1.

The counter control unit 20 opens the gate only when the output j of the comparator 19 is '1', and functions to pass the clock el from the clock generator 22 to the output k.

The counter 21 is reset at the rising edge of the signal l from the clock controller 25, counts the clock ej supplied by controlling the counter controller 20, and functions to output the count result K.

The comparator 23 compares the output of the counter 21 with the output (2) of the counter 24, and generates an output S when (K=1).

The counter 24 is controlled by the clock control unit 25, and is reset each time one scanning line worth of image data is input from the input terminal, and is reset by "1" every time one scanning line worth of image data is outputted to the output terminal. It will be counted up.

When the clock control unit 25 is also supplied with the signal n, the output control unit 26 operates so that the output terminal trap image @gator D l' is not output.

The multiplier 27 may be the line buffer 13, or may be the line buffer 12.The multiplier 27 may be the line buffer 13, or may be the line buffer 12. Image data to be output,
Do this for the other person.

The coefficient setter 30 calculates the coefficient E by performing the following calculation using the data from the counters 21 and 24 and I.

E=Director (1) Similarly, the coefficient setter 31 calculates the coefficient by the following calculation.

1) = , (K-I) ...... (2
) Next, the operation will be explained.

First, the variable magnification ratio R is set in the variable magnification register 6 from the input state, and then, when initialization for starting operation is performed, the data in the buffer register 5 becomes "0", and the switching gate 14 and the addition R% Data R is input via 1B.

Therefore, when the magnification ratio R is less than ID0, register 1
Since the output data P of No. 5 does not reach 1 from the beginning, the comparator 19 does not generate the output j, and the C counter 21 remains set to the signal l', so the output data contains "O". ”, and the output data P of register 15 is (
1) = xt).

On the other hand, when the magnification ratio I (set in the magnification ratio register 16) is 1.00 or more, the output "" becomes "IT",
The input 2 of the switching gate 14 is connected to the output 0, and the data "-1" of the subtraction storage 17 is input to the adder 18. At the same time, the output k of the counter control section 20 receives the clock c.
Since 1 piece of j is made, the counter 21 counts 1,
The register 15 latches the data of the adder 18 by the output of the OR gate 33 (new data P).
shall be. Then, since this f-data P is manually inputted to the comparator 19 again, the above operation is repeated until the output data P of the register 15 becomes l-IJ or less, and finally the change occurs. When the integer part of the addition data of the magnification 11 and the output data P of the register 15 is latched as data in the counter 21, and the part below the decimal point is latched as data P in the register 15, the above operation is stopped.

Further, due to the above-described initialization, the black controller 25 outputs the signal j for a predetermined period, and thereby the switching game) 10
．． 11, the arc of the first scanning line of the image data DI is stored in the first line buffer 12, and the image data of the second scanning line is stored in the second line buffer 13.

Now, at this time, the counter 24 has been cleared along with the input of the image data DI.

Therefore, if the output data K of the counter 21 is "0", then -f buffer 12.
Immediately after inputting the image data DI to 13, the comparator 23
A signal S is output. As a result, the clock control section 2
5 generates a signal 1, sets the switching gate 10.11 to input mode, and inputs the image data DI for the next one scanning line to the line buffer 13. Meanwhile, at the same time, the clock control section 25 generates a signal n and controls the output control section 26 to prevent the image data D1/ from being output to the output terminal.

Therefore, at this time, image data DI for one new scanning line is stored in the line buffer 13, and at the same time,
The image data for one scanning line that was previously stored in the line buffer 13 is transferred to the line buffer 12, and as a result, the image data that was previously stored in the line buffer 12 is lost and the output terminal is Not taken out.

Next, assume that the output data K of the counter 21 is "l". Then, since the comparator 23 does not generate the signal S at this time, the clock control section 25 does not generate the signal J. Therefore, the switching devices 10 and 11 remain in the circulation mode, and in this state, the signal M is not generated. Since the clocks e and l are supplied, the image data stored in the line buffers 12 and 13 are read out once, and the multiplier 2
After being multiplied by a coefficient of 7.28 and E, they are combined in an adder 29 and outputted to an output terminal as image data 'It D I/.

Then, when the image data D11 for one scanning line is output, the clock control section 25 starts the counter 2.
4 by r+J.

Therefore, at this point, the output data I of the counter 24 is "1".
'' and matches the data of the counter 21, the comparator 23 outputs the signal S.

Therefore, at this time, similarly to the case (K=0) described above, the image data DI for the next one scanning line is taken in from the input terminal, and at the same time, the output control section 26 sends the image data to the output terminal using the signal n. Prevent data from being output.

Furthermore, if the output data K of the counter 21 is 12'', first the output data I of the counter 24 is rO
When J, one scanning line worth of image data is stored in line buffer 1.
2.13, multiplier 27.28 and adder 2
9, the image signal DI/ is output to the output terminal, and accordingly, the output data I of the counter 24 becomes rlJ.
K becomes. Therefore, since the condition (K=1) is not satisfied at this time, the signal S is not generated, and the data read from the line buffers 12 and 13 is sent to the output terminal as 1.
The image data for each scanning line is output as DI/. Note that at this moment, the data in the line buffer 12.13 is inputted again at the same time as it is read out because the switching gate 10.11 is in the circulation mode, so there is no risk of the data being lost.

In this way, once again, the image data D for one scanning line is output from the output terminal.
When I/ is output, the counter 24 again becomes "1".
", the output data l Get becomes "2", and a signal l appears at the output of the comparator 23.

When the signal 8 appears, the next scan line worth of stroke data DI is taken in again, and during this time, the output of the image data DI10 to the output terminal is stopped.

Therefore, according to this embodiment, line buffers 12, 1
After the image 9 data DI is manually inputted to 3 for each scanning line, the output status of the image data taken into the line buffer 12 and 13 to the output terminal is determined according to the value of the output data of the counter 21. When the output data K of the counter 21 is "0", one scanning line worth of image data I) is newly fetched without sending any image data to the output terminal. The image data will be deleted, and the output data K of the counter 21 will be stored in the line buffer 12.13.
Since each time the image data DI/ is output to the output terminal only once, the next new image data DI for one scanning line is input, so at this time, the input image data DI and the output image The same number of scanning lines is maintained for the data D I/, and the output data K of the counter 21 is
2", two scanning lines of image data DI/ is output in response to input of one scanning line of image data DI, and the number of scanning lines increases with respect to the input image data DI. If the image data DI/ is obtained, then K
Become.

On the other hand, since the image data DI for each scanning line from the above-mentioned input terminal is taken in by the signal l, the output data of the counter 21 for each timing puffer includes the output of the Bano 7 register 15 at that time. Data P
is updated by the integer part of the data obtained by adding a new magnification ratio l() to .

Therefore, according to this embodiment, deletion and increment of image data for each scanning line by the output data K of the counter 21 described above can be performed by a predetermined number of inputs of image data DI input one scanning line at a time from the input terminal. It is repeated each time it is performed, and the degree of repetition at this time is determined by the magnification ratio.

To explain this with the following Tables 1 and 2, Table 1 shows when the magnification ratio It is 1.15 times, and when the number of scanning lines 1 of the input image data is between 1 and 6. Data (p H-R
) is less than 2, so the data is rlJ, but when the scanning line number becomes 7, the data (P + R) becomes 2.
Now, since the data K becomes "2", the number of output scanning lines Lo increases by one, and thereafter, as the data (P+It) becomes 2 or more, the number of tilt output scanning lines Lo increases, and this It can be seen that the ratio of the number of output scanning lines Lo to the number of blurred input scanning lines .multidot..converges with the variable magnification RE.

Table 2 shows the case when the magnification ratio R is 0.85 times, and in this case, the number of input scanning lines is 1, 7, and 14 (hereafter -F is omitted), and the data K is rOJ K, and the output scanning It can be seen that the number of lines Lo decreases by 1 and the ratio of the two converges to the magnification ratio R1c.

Table 1) L=1.15 Table 2 R=0.85 By the way, in the embodiment shown in FIG. The adder 2 adds the image data of two consecutive scanning lines read simultaneously from the line buffers 12 and 13.
The multipliers 27 and 28 are used at this time to supply the result of multiplying the coefficients and E to the adder 29.

As shown in formulas (1) and (2), this coefficient E is calculated as 39 from the output data of the counter 21 and the output data I of the counter 24, so these 0), (
2) By setting the formula to an appropriate formula, the increase in the number of scanning lines is not simply done by repeating the same scanning line.
Since this is performed by data interpolation between two adjacent scanning lines, deterioration in image quality due to the difference in the number of scanning lines between input image data and output image data can be minimized.

By the way, this conversion device 1 is not limited to a so-called hardware configuration as in the embodiment shown in FIG. Needless to say, FIG. 3(a), width) is a flowchart showing the processing of one embodiment by this software, and its contents can be easily understood from the explanation of the embodiment in FIG. By the way, I will omit it.

Now, in the above embodiment, in order to change the size of the image, the conversion device 1 only changes the number of scanning lines, and in the main scanning direction, does not increase or decrease the number of pixels within the scanning line, but changes the pixel interval. This was addressed by changing the .

However, according to the present invention, it is also possible to change the number of pixels in the main scanning direction according to the magnification ratio. Figure 4+a) to (C).

In FIG. 4 (al to (C)), M is the 10-bit number (pixel number) for the in-buffer F, Q is the bit number (pixel number) for the in-buffer 2, and S is the one shown in FIG. and Fig. 3 1al, (Q in bl, N is also I, hereafter J is K, l is PK, F is 1), G
correspond to E, respectively.

Therefore, when the processes in FIG. 4 ta) to (C) are repeated, the image data stored in line buffer 2 is The number of pixels is increased or decreased according to the magnification ratio R, and the size of the image can be changed by increasing or decreasing the number of pixels in the main scanning direction.

Note that the processing in Figures 3(a) and (b) above and this Figure 4(
If both processes a) to (C) are performed, both the number of pixels in the main scanning direction and the number of pixels in the sub-scanning direction, that is, the number of scanning lines, are increased or decreased depending on the magnification ratio R. Needless to say, it is possible to obtain an image of any size without changing the operating conditions of the output Glock, such as a plate-making scanner. The charts shown in Figure 5 +a) to (d)
It is l.

Next, as in the embodiment shown in Fig. 3+a) and (b),
Another embodiment of the conversion device 1 will be described in which the number of scanning lines is increased or decreased according to the magnification ratio using software.

The conversion device in the present invention increases or decreases the number of scanning lines according to the magnification ratio, so if the magnification ratio expressed in % is A, this person can convert 100 scan lines of the input image data. It represents the number of scanning lines of image data output for a book.

Therefore, if IA-1001 is B, then B represents the increase or decrease in the number of scanning lines of image data to be output for every 100 scanning lines of input image data.

Therefore, the quotient obtained by dividing 100 by the above-mentioned B is C1, and the remainder is E, and furthermore, C+l=D B-E=F.

Then, in order to set the number of scanning lines of the image data to be output to A for the input image data for Hloo scans, K is 1 to 0 for 100 input scanning lines.
It is sufficient to increase/decrease the number of books (this is called the first process) F times, and increase/decrease every 0 books (this is called the 1N process) E times.

Example 1° Magnification ratio 115% A = 115, B = 15 10o/1. =6 remainder 10,', C=6. D=Q+1=7 E=10. F=5 The number of scanning lines output for 100 scanning lines input is Z
Then, Z = (6 + 1) X5 + (7 + 1) D=3+1=4 E=10, F=30-10=20Z:(3-1
) X20+(4-1) At this time, these first and second processes should be repeated 10 times.
The problem is how to distribute it among the 0 input scanning lines.

For example, after performing the process ■ F times in succession, the process ■
If the process is repeated six times in a row, even if the number of output scanning lines increases or decreases as per the variable magnification ratio, the output image will be a partially distorted image with a different magnification ratio, resulting in distortion. I would end up doing that.

Therefore, in this embodiment, the first process and the first I process are distributed in the following manner, so that a nearly uniform magnification ratio of 1 can be obtained on the image plane.

That is, first, the magnitude relationship between E and F is determined, and E and F are removed so that the difference between them is 1 or more.

In other words, E (F then G=F/E E'> F 7; (ra G = E/
11” calculation.

The first process or the second process is repeated the number of times represented by the integer part of G thus obtained.

After that, if the process ■ was repeated, process the process ■, and if the process ■ was not repeated, then the process ■
Each process is performed only once, and these two types of operations are repeated until the number of executions of process (1) reaches E times, or the number of times of execution of process (2) reaches F times.

Finally, the process that has not been executed E or F times is executed until it reaches E or F times.

If the above processing is represented in a flowchart, Figure 6+8)
It becomes like ~(g). In addition, this Figure 6 (al~(g
) in the examples are as shown in Fig. 2, Fig. 3 (,I),
(b).

There is no particular relationship with the embodiments shown in FIGS. 4(a) to (C) and FIGS. 5(at to (d)), and they are used independently.

Therefore, according to this embodiment, the increase/decrease in scanning lines according to the magnification is distributed almost uniformly within the image data of one image plane, and locally within one image f quadrant. Since there is no possibility that the magnification will change, deterioration of image quality due to distortion can be almost prevented.

In addition, according to the embodiment shown in FIG. Since this only counts the number of pixels, the main component can be a counter, making it easy to configure. Further, since the numerical value to be set in this counter is also set only by division of integers, there is no room for errors due to numerical values below the decimal point, and the effect that the magnification ratio can be achieved accurately can be obtained.

In the above embodiments, the magnification ratio is fixed while outputting one image, but this magnification ratio may be changed as a function of the image surface. In this case, it is possible to obtain an output image in which not only the size of the entire image but also the image pattern within one image is modified.

In addition, output plotters are not limited to plate-making scanners.
Needless to say, any type of device such as a flying spot scanner or a laser beam recorder can be used, and the effects of the present invention can be fully achieved in either case.

As explained above, according to the present invention, the size, aspect ratio, etc. of a reproduced image obtained by an output plotter such as a plate-making scanner can be directly input to the output Glock without changing the operating conditions of the output Glock. Only the processing of image data can be arbitrarily controlled by K.

At this time, the scanning line density of the image data handled by such a dual-layer output plotter is generally 12 IC/Onai and 20 7. In most cases, the pixel data sampling density in the main scanning direction is set to approximately the same value.

Therefore, even if the scanning line or pixel data becomes discontinuous in a part of the image, there is almost no possibility that it will be discerned by the human eye on the reproduced image plane. For example, even if pixel data in the main scanning direction and scanning line direction is extracted by K1 pixels at predetermined intervals, or if the same pixel data is increased by repeating the same pixel data, the resulting deterioration in image quality is almost never a problem; It is possible to easily control the size, aspect ratio (outline of the image), etc. of the output image, and to easily provide an image magnification conversion device that can easily control the magnification while eliminating the drawbacks of the prior art.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an image magnification conversion device according to the present invention applied to a plate-making scanner, FIG. 2 is a block diagram showing an embodiment of the image magnification conversion device according to the present invention, and FIG. 3+a ), (b) are flowcharts explaining the operation of one embodiment of the present invention, FIGS. 4(a) to (C1, FIG. 5+a) to (dl, and FIG.
1 is a flowchart explaining the operation of different embodiments of the present invention. 1... Image magnification conversion device, 10.11...
...switching game), 12.13... line buffer, 14... off? Gate, 15...
・Buffer register, 16...l'-magnification v
Sister, 17... Subtractive storage, 18...
・Adder, 19... Comparator, 20...
Counter control unit, 21... Counter, 22...
... Clock generator, 23 ... Comparator, 2
4... Transfer counter, 25... Clock control section, 26... Output control section, 27.28.
... Multiplier, 29 ... Adder, 30.3
1... Coefficient setting section, 32... Differentiator,
33...OR gate. Figure 3 (b) Figure 4 (C) Figure 5 (b) Figure 6 (b) Figure 6 (C) Figure 6 (d) Figure 6 (e) Figure 6 (f) Figure 6 Figure (9)

Claims (1)

[Claims] (1) Input image data that can be captured at any timing for each scanning line from one frame's worth of image data. In an image magnification conversion method in which the ratio between the size and the output image size is arbitrarily controlled, means for increasing or decreasing pixel data within a scanning line of input image data by one pixel every predetermined number of pixels; At least one means for increasing or decreasing the pixel data of each scanning line of the input image 1M by t scanning lines every predetermined number of scanning lines, and outputting image data having a different number of pixels from the input image data. An image magnification conversion device characterized in that it is configured to control a ratio of image sizes by controlling the image size ratio. (I) An image magnification conversion device according to claim 1, characterized in that the increase or decrease of pixel data by the means described above is performed by interpolation of input image data.