JP2001053959A - Magnifying device for image data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnifying device suitable for the case the prestage of magnifying processing is the simultaneous outputs of plural lines, and further suitable for high-accuracy magnifying processing, for which the image data of a line under consideration and several lines before and after that line under consideration are required, and simultaneous batch processing of magnification and MTF correction. SOLUTION: A magnifying device 7 is provided with a line memory 2 having capacity for 7 lines for storing the simultaneously inputted image data of 4 lines, means 3 and 6 for selectively and simultaneously outputting the image data of 4 lines among image data i1-i7 in the line memory 2 and simultaneously inputted image data i8-i11 of a 4 lines according to control signals (h) and (g) and means 4 and 5 for generating the control signals (h) and (g) according to a designated magnification, applying them to the means 3 and 6 and magnifying the image data outputted by the means 3 and 6. During the repetition of simultaneous 4-line input from the upstream, the output means 3 and 6 simultaneously output 4 lines with the line under consideration as a center plural times while changing the line under consideration. Expansion/reduction in the number of output lines is controlled by the control signal (g).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electrical scaling of image data for image scaling, and more particularly, but not exclusively, to speeding up or improving image reading. For this purpose, image reading for a plurality of n lines is simultaneously performed and digital processing is performed in parallel to generate image data of a plurality of systems in parallel, or not limited to original image data, In order to perform high-speed processing of the generated image data or to perform processing for referring to the two-dimensional luminance or density distribution, image data for a plurality of n lines is simultaneously supplied to the processing stage. Alternatively, the present invention relates to an apparatus for performing a scaling process on the image data when outputting from the processing stage simultaneously. This scaling device can be applied to, for example, a digital copying machine, a facsimile, an image scanner, a printer, an image editing system, etc., which scales image data (digital image information) by digital logic processing.

[0002]

2. Description of the Related Art Japanese Patent No. 2789560 discloses that a single line is repeatedly read by a document scanner to convert a video signal into digital data, that is, image data.
The data is subjected to shading correction, and magnification and magnification processing in the main scanning direction and MTF correction, and magnification and magnification processing in the sub scanning direction and M
There is disclosed an image data process in which a TF correction is performed, and further, a process for recording is added and given to a printer. Several types of digital scaling processing are described in detail, and scaling processing for simultaneously performing scaling and MTF correction for compensating image quality deterioration due to the scaling is also described.

Japanese Patent No. 2582058 discloses a line memory having at least one scanning line capacity, a scaling controller, and a scaling process in order to easily perform an electrical scaling process on image data. Also, a variable power control device combining a first to a third selector is disclosed.

[0004]

However, in any case, since the scaling process assumes successive input of single-line image data, the scaling process is performed in parallel with the image data process preceding the scaling process stage. This is not applicable when a plurality of n lines of image data are output simultaneously.

By the way, in high-precision zooming in the sub-scanning direction,
It is necessary to refer not only to the line to be processed (line of interest), which is updated one after another, but also to the image data of the lines in the vicinity thereof, and several lines of image data centered on the line of interest are required. . Similarly, the MTF correction process requires several lines of image data centered on the line of interest. Therefore, the fact that the image data of a plurality of n lines can be obtained simultaneously in parallel from the image data processing of the preceding stage can compensate for the high-precision magnification, or the deterioration of the image quality due to the high-precision magnification and magnification. Batch processing with MTF correction
There are some aspects that are convenient for realizing.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a variable magnification apparatus suitable for a case where a preceding stage of a magnification processing stage outputs image data of a plurality of n lines simultaneously in parallel. It is a second object of the present invention to provide a zooming apparatus suitable for high-precision scaling processing requiring image data of several lines before and after the above, and simultaneous batch processing of scaling and MTF correction.

[0007]

(1) Storing image data for a plurality of n lines (four lines) inputted simultaneously, n
Memory means (2) having a capacity of at least lines (seven lines); image data (i1 to i7) of n lines or more of the memory means (2) and image data of a plurality of n lines simultaneously inputted (i8 ~ i
Image data for multiple m lines (4 lines) in 11)
Means (3, 6) for selecting and simultaneously outputting according to the line output control information (h, g); and line output control information of the input line image data (i1 to i7) according to the designated magnification
means (4,5) for generating (h, g) and providing the same to the simultaneous output means (3,6), and for scaling the image data output by the simultaneous output means (3,6); A variable magnification device for image data.

For easy understanding, reference numerals or corresponding items of the corresponding elements of the embodiment shown in the drawings and described later are added in parentheses for reference.

According to this, the memory means (2) has image data of the preceding n lines or more (seven lines) up to the previous writing, and the image data of a plurality of n lines (4 lines) inputted this time is stored. When the data is combined, it is 2n lines or more before and after (11 lines)
The image data of arbitrary plural lines in the image data of (1) can be given to the scaling processing means (4, 5) by the simultaneous output means (3, 6). Therefore, the scaling processing means (4, 5)
High-precision zooming in the sub-scanning direction, which requires several lines of image data at the center of the line of interest simultaneously, can be performed. MTF correction requiring several lines of image data simultaneously can be performed. That is,
A high-precision scaling process suitable for a case where a plurality of n lines of image data are output simultaneously in parallel from the image data process in the preceding stage of the scaling process stage can be realized.

[0010]

(2) The simultaneous output means (3, 6)
Is an image data for a plurality of m lines (4 lines) centered on the line of interest while changing the line of interest in the gap of the repetition of simultaneous input of image data for a plurality of n lines (4 lines).
Data is output multiple times (Figs. 4 and 5).

For example, in the case of the equal magnification processing, since image data for n lines arrives at one time, from the arrival thereof to the next image data for n lines arrives. While changing the line of interest, n times of output of image data for m lines centered on the line of interest is output to the scaling processing means (4, 5). In the case of the enlargement processing, the output of the line of interest without change is added n times or more. In the case of the reduction processing, some lines are discarded and the image data of m lines is reduced less than n times. Output to the double processing means (4, 5). As a result, high-precision scaling data processing and MTF correction that refer to not only the line of interest but also the lines before and after it can be performed. (3) The line output control information (h, g) is information (h) indicating whether the image is enlarged (h = L) or not (h = H) and whether or not the output line is updated (g = H).
(g = L); the simultaneous output means (3, 6) expands the line output control information (h, g) (h = L) and updates the output line (g = H) , The output line No. To output image data for a plurality of m lines (4 lines), and if the output line is not updated (g = L), the m lines (4 lines) output immediately before
The image data of the corresponding minutes is output again ((b) of FIGS. 2 and 4).

[0012] According to this, the scaling processing means (4, 6) controls the simultaneous output means (3, 6) with the line output control information (h, g) to obtain the same line image in the case of enlargement. Duplicate (repeated) output of data is performed for each line, and image data of the number of lines corresponding to the required magnification can be obtained from the simultaneous output means (3, 6).

For example, in the case of 3/2 enlargement (h = L), the scaling processing means (4, 5) uses the first and second lines of the original image as the line of interest. When inputting image data to the output line, the output line update (g = H) is given to the simultaneous output means (3, 6), and when the input of the second line is completed, the output line update is not performed.
(g = L) to the simultaneous output means (3, 6), and when image data is input to the scaling processing means (4, 5) using the third and fourth lines of the original image as the line of interest, The line update (g = H) is given to the simultaneous output means (3, 6), and when the input of the fourth line is completed, the output line update rejection (g = L) is given to the simultaneous output means (3, 6). In other words, every time the input of the even-numbered line of the original image is completed, the output line update rejection (g = L) is given to the simultaneous output means (3, 6), and the input of the even-numbered line input immediately before is input once more. The output line updating necessity signal g is set to H, H in accordance with the overlap, that is, in accordance with the line switching of the original image data.
By switching to H, L, H, H, L,.
Image data of the number of lines for 3/2 enlargement processing can be input to the scaling processing means (4, 5). Magnification processing means (4,5)
And the actual line selection processing of the simultaneous output means (3, 6) are simple. (4) The line output control information (h, g) includes information (h) indicating whether the image is reduced (h = H) or not (h = L), and whether or not the line is thinned (g = L) (g =
H); the simultaneous output means (3, 6) outputs the line output control information (h, g) reduced (h = H) and the line thinning (g =
L), output of image data for a plurality of m lines (for four lines) is stopped and output line No. And skip line thinning (g
= H), image data for a plurality of m lines (for four lines) is output and output line No. (Figs. 3 and 5).

[0014] According to this, the scaling processing means (4, 5) controls the simultaneous output means (3, 6) with the line output control information (h, g) to reduce the predetermined line in the case of reduction. Simultaneously outputting image data of the number of lines corresponding to the required reduction ratio by thinning out
It can be obtained from (3,6).

For example, in the case of a reduction of 2/3 (h = H), the scaling unit (4, 5) uses the first and second lines of the original image as lines of interest. At the time of inputting image data to the first line, whether or not line thinning (g = H) is provided to the simultaneous output means (3, 6), and when the input of the second line is completed, line thinning (g = H) is performed.
L) to the simultaneous output means (3, 6), and outputs image data to the scaling processing means (4, 5) using the third and fourth lines of the original image as lines of interest.
At the time of data input, whether or not line thinning (g = H) is given to the simultaneous output means (3, 6), and when the input of the fourth line is completed, line thinning (g = L) is simultaneously output means (3, 6) ), The line thinning (g = L) is given to the simultaneous output means (3, 6) every time the input of even-numbered lines of the original image is completed,
9,... By performing line thinning, that is, in accordance with the switching of the lines of the original image data, the line thinning necessity signal g is changed to H, H, L, H, H, L,.
The image data of the number of lines for 2/3 reduction processing can be input to the scaling processing means (4, 5) by switching to. The process of selecting the thinned line of the scaling processing means (4, 5) and the actual line thinning process of the simultaneous output means (3, 6) are both simple. (5) a plurality of n or more line memories (m1 to m7: 2) each having a capacity of at least one scanning line, and an output side connected to the line memory (2), and corresponding to the input magnification. A controller (5, 6) for specifying a read address for the line memory (2), and a data correction unit for correcting input image data according to the input magnification.
(4, 5), the input side is connected to the external image data line and the line memory (2), the output side is connected to the data correction unit (4, 5), and input from the outside through the external image data line A selector (3) for selectively outputting image data and image data output from the line memory, and a data correction unit for line image data simultaneously input from the outside through n lines (4 lines) via an external image data line (4,5)
1).

According to this, it is possible to easily cope with simultaneous output image data of a plurality of n lines coming from various image processes before the scaling process. It is possible to easily realize high-precision scaling processing that refers to not only the line of interest but also image data of lines before and after the line and MTF correction for improving image roughness due to scaling. (6) The above-mentioned (5) in which line image data input simultaneously from the outside by n lines via an external image data line is controlled in such a manner that the number of lines is enlarged in the sub-scanning direction and given to the data correction unit. Since there is a line memory (m1 to m7: 2) for storing image data of a plurality of n or more lines, the number of lines is expanded by repeatedly outputting image data of the same line. This reading and input to the data correction units (4, 5) can be easily controlled. (7) The above-mentioned (5), in which line image data input simultaneously from the outside by n lines via an external image data line is controlled so as to reduce the number of lines in the sub-scanning direction and to provide the reduced data to the data correction unit.

Since there is a line memory (m1 to m7: 2) for storing image data of a plurality of lines n or more, it is necessary to refer to not only the line of interest but also the lines before and after the line of interest. Even when performing MTF correction to improve the roughness of the image, even if the number of lines given to the data correction unit is reduced for reduction, the lines before and after the data are stored in the line memory (m1 to m7: 2). Simultaneous input of required lines to the correction units (4, 5) can be easily controlled.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0019]

FIG. 1 shows a functional configuration of an embodiment of the present invention.
In the scaling device 7 of this embodiment, the image processing 1 in the preceding stage
Differently adjacent four lines of image data are simultaneously provided in parallel. The image processing 1 is, for example, processing for shading correction of image data obtained by digitally converting a video signal read by a document scanner. However, since the scaling process of the image data can be performed at any point in the flow of the image data, the input image data of the scaling device 7 of this embodiment is shaded. It is not limited to the correction output.

2 is a memory area m1 for each of 7 lines.
A line memory having m7, 3 is a line data selector, 4 is a scaling correction device, 5 is a scaling controller, and 6 is a line memory controller. The four lines of image data output simultaneously by the image processor 1 are output from a line data selector 3.
Are written to the input ports i8 to i11 of the line memory 2 and written to m4 to m7 of the line memory 2. At this time, m1 to m
7, the line image data of m5 is written to m1, the image data of m6 is written to m2, and the line image data of m7 is written to m3. Be included.

The line data selector 3 has input ports 4 (i1 to i1) designated by the line memory controller 6.
The image data arriving at (4 of i11) is output to an output port.
Data bus selection connection for outputting to the data O1 to O4. The image data of the output ports O1 to O4 is given to the scaling correction device 4.

In the following, the image data output by the preceding image processor 1 is referred to as original image data, and the image data output by the line data selector 3 is referred to as processing image data. The image data output from the magnification correcting unit 4 is called image data after magnification. In the case of the same magnification, image data processing for substantially enlarging and reducing the image is performed. Will not be. However, MT corresponding to magnification (in this case, for 1 ×)
The F correction processing has been performed.

Each of the line image data of the line memories m1 to m7 and the original image data of 4 lines, a total of 11 lines (i
Which four lines of the image data 1 to i11) are to be given to the magnification correcting device 4 depends on the position of the line of interest which is known from the magnification control data at the time of enlargement (including the same magnification) and at the time of reduction. Line image data of a line is stored in a line memory m2.
If it is in any one of .about.m5, four lines are prepared from the line memory 2 and read out. If the line image data of the line of interest is in the line memory m6 or m7, three or two lines are prepared from the line memory 2 and read out. Here, the line of interest is the variable power correction device 4
Is a line to be subjected to magnification correction. In the following, a line N of original image data such as L1, L2,.
o. Expressed by

The variable power correction device 4 has a built-in line memory for one input line. Of the line image data, and this line image data and the line image data of the four lines inputted this time are combined, and the image data of a total of five lines corresponds to the designated magnification. Interpolation of pixels in the main scanning direction (writing of image data twice and writing of data three times) and thinning are performed, that is, image data in the main scanning direction is enlarged and reduced, and the center of five lines is processed. A pixel on the line, that is, a pixel (image data) on the line of interest is sequentially determined as a pixel of interest (pixel to be processed) from the first pixel in the main scanning direction, and a 5 × 5 pixel matrix centering on the pixel of interest is determined. The image data of the pixel at the sampling point corresponding to the designated magnification in the matrix is substituted into a variable magnification correction equation corresponding to the designated magnification and also including the MTF correction at the same time. Corrected image data of the pixel of interest (image data after scaling) ) Is calculated and output as the pixel of interest. At this time, the image data input to the scaling correction device 4 is added to four lines and the preceding one line held in the device 4 to make a total of five lines as reference lines. The output is an image data output (single line output) of one line corresponding to the line of interest after scaling.

FIG. 4A shows a line of the original image data (output line of image processing 1 in the preceding stage) and a line data selector at the same magnification (included in the enlargement in this embodiment). FIG. 4B shows processing image data lines input from the output ports O1 to O4 of No. 3 to the scaling correction device 4.
FIG. 5 shows the case of 3/2 times magnification, and FIG.
This shows the case of reduction. In these drawings, the dotted line is the line of interest.

For example, at the left end of FIG. 4A, while the first four lines L1 to L4 of a one-page image are being output by the preceding image processing unit 1, in synchronization therewith, the frontmost line L1 , The line image data of the line memory m7 (i7) (shown as blank at the top of the page because no actual image data exists) and the previous three lines among the four lines L1 to L4 This shows that L1 to L3 are selected by the memory controller 6 and the line data selector 3 and output to the scaling correction device 4. At this time, the memories m5, m
6 and m7 are written in the memories m1, m2 and m3, and the line image data of the four lines L1 to L4 of the original image data are written in the memories m4 to m7.

The block on the right is the image processing 1 of the previous stage.
No image data is output, and the line of interest is
To four lines L1 to L4 of the line memories m4 to m7.
This indicates that the image data of L4 is output to the scaling correction device 4 via the input ports i4 to i7 and the output ports O1 to O4 of the line data selector 3.

Next, the lines required by the scaling correction device 4 are L2 to L5 including the line of interest L3, but the line image data of L5 does not exist in the memory 2. Then, the memory controller 6 waits for the preceding image processing 1 to output the next lines L5 to L8, and when the image processing 1 outputs the next lines L5 to L8, the memory controller 6 The line image data (i5 to i7) of L2 to L4 of the memories m5 to m7 and the first line L5 of the new four lines L5 to L8 are selected by the memory controller 6 and the line data selector 3. Line number of the original image data.
The L3 is output to the scaling correction device 4 as a target line.
At this time, the line image data of the memories m5, m6 and m7 are simultaneously written into the memories m1, m2 and m3, and the four lines L of the original image data are written into the memories m4 to m7.
Write each line image data of 5 to L8. When this is completed, the line memories m1 to m7 have line image data L2 to L8.

Based on these line image data, one transfer line, in which the lines of interest are L4, L5 and L6, is L3 to L6 (i2 to i5) and L4 to L7 (i
3 to i6) and L5 to L8 (i4 to i7) can be transferred three times, so the memory controller 6 performs these three transfers.

Similarly, the next four lines (L9 to L9)
While the original image data of (12) is being output by the preceding image processing 1, the image data for processing of four lines (L6 to L9) with the target line being the next line (L7) is scaled. Correction device 4
Is output (transferred), and when this is completed, the line of interest is sequentially advanced to perform three transfers. The same applies hereinafter.

In the case of the enlargement of 3/2 shown in FIG. 4B, with respect to the odd-numbered line of the original image data, the data to be processed for one line is used as the line of interest once. Is performed on the magnification correcting device 4. For the even-numbered line of the original image data, the data to be processed is transferred twice for the four lines using that line as the target line. 4
Perform for For these two repeated transfer instructions,
A control signal g is used, which is generated by the scaling controller 5 and supplied to the memory controller 6. When the control signal g is H, the memory controller 6 sets the line of interest to 1
The data to be processed is transferred to the variable-magnification correction device 4 by a total of four lines, that is, one line before and two lines after the line, and when the control signal g is L, attention is paid. The data to be processed of the above four lines is transferred to the scaling correction device 4 without advancing the lines. When the magnification controller 5 enlarges the above-mentioned 3/2,
The control signal g is set to H, H, L / H, H, L
/ H, H, L /...

The magnification controller 5 changes the control signal g to H / L, L /
Switch to H alternately. Thus, the data transfer in which each line of the original image data is set as the line of interest is repeated twice for each line of interest. In the case of the enlargement of 5/2, the control signal g is changed to H, L, H, L, H / H,
L, H, L, H / H, L, H, L, H /. No. 3 multiple Is the line of interest for one time, and the data to be processed is transferred simultaneously for four lines. Is the line of interest 2
In this case, data to be processed is transferred simultaneously for four lines. By operating the control signal g in this manner, data to be processed can be transferred at any magnification.

At the time of 2/3 reduction shown in FIG. 5, the third line L3 of the original image data and its multiple No. With respect to the line No., the data to be processed for one line, which is the line of interest, is not performed. Repeat for other lines. In the case of reduction, the control signal g is used, but the instruction indicated by the level L / H is different from that in the case of enlargement. The memory controller 6 is reduced (h
= H), when the control signal g is H, the line of interest is advanced by one line, and the preceding and subsequent two lines, that is, a total of four lines of data to be processed, are transferred. This is performed for the variable power correction device 4, but when the control signal g is L
In this case, the line of interest is advanced, but the data to be processed for four lines is not transferred. That is, a multiple of No. 3
Is thinned out from the line of interest. At the time of the above-mentioned 2/3 reduction, the scaling controller 5 converts the control signal g into H, H, L / H, H, L / H, H,
Switch to L / ...

At the time of 1/2 reduction, the scaling controller 5 changes the control signal g to H / L, L / L every time the line is switched.
Switch to H alternately. As a result, data transfer in which even-numbered lines are thinned out from the line of interest is performed. At the time of 2/5 reduction, the control signal g is set to H,
L, H, L, L / H, L, H, L, L / H, L, H,
Switch to L, L / ... By operating the control signal g in this manner, data to be processed can be transferred at an arbitrary reduction ratio.

The scaling controller 5 generates a control signal h corresponding to the indicated magnification, a low level L when the magnification is the same or an enlargement, and an H signal when the magnification is a reduction, and outputs the control signal h as described above. This is supplied to the memory controller 6 together with the control signal g.

FIGS. 2 and 3 show a memory controller 6.
The outline of input / output control of line image data from the start point to the end of one-page image data input will be described.

Referring first to FIG. 2, when the one-page image data input start is notified, the memory controller 6 clears the line memory 2 (step 1), and
o. Register OLNo. Then, 1 indicating the first line (L1) is written (step), the input port i7 is written into the selected input port start point register IN, and the input ports i7, i8, i9 of the line data selector 3 are written. And i10 are connected to output ports O1, O2, O3 and O4, respectively. Then, the image processing 1 of the preceding stage is performed via the control signal line.
Is notified (step 3).

The preceding image processing 1 includes four lines L1 to L4
The controller 6 waits for the start of the output of the line memory m4.
To m7, and data of m5 to m7 are written to m1 to m7.
3 and furthermore, the line data of the memory m7 and the line data of the three lines L1 to L3 are connected to the set connection (i7
To i10 / O1 to O4), and outputs the result to the scaling correction device 4 (step 5). This state is shown at the leftmost end in FIGS.

When the processing is completed for the entire line length, the controller 6 notifies the image processing 1 of the busy state and reads the outputs h and g of the variable magnification controller 5 (step 6). If the control signal h is L for instructing enlargement (including the same magnification), the control signal g is referred to, and if it is H, the attention line No. Is advanced by one (steps 7 to 9), and the outputs (i4 to i7 /
O1 to O4) are set (step 10). Since this output is possible, the data (L1) of the line memories m4 to m7 are set.
.. L4) are read out and output (steps 11 and 12).
Then, the control signals h and g of the variable power controller 5 are read (step 13). Then, if there is no change in the enlargement (h = L) (step 14), the level of g is referred to (step 15). Is advanced by one (step 16), the extraction port of the four lines to be transferred is also advanced by one (step 17), the page end is checked (18), and if it is not the page end, the end of the extraction port It is checked whether the tail is out of the line memory 2 (step 11). When the line memory 2 is removed, the output from the preceding image processing 1 is necessary. Therefore, the memory controller 6 notifies the image processing 1 of ready (step 19A), and the image processing 1 executes the next four lines (step 19A). L5 to L8) are output (step 19B).

Image processing 1 is performed on the next four lines (L5 to L8)
Is output, in synchronization with the line memory m5
L2 to L4 line image data (i5 to i7)
And the first line L5 of the new four lines L5 to L8
Is the line number of the original image data. The L3 is output to the scaling correction device 4 as a target line. At this time, the line image data of the memories m5, m6 and m7 are simultaneously stored in the memory m.
1, m2 and m3, and each memory m4 to m
7, the line image data of the four lines L5 to L8 of the original image data are written (step 20). When this is completed, seven lines (L2 to L2) are stored in the line memories m1 to m7.
L8) line image data, the data of the next line of interest is in the line memory m3 (i3), and the data of the next four lines to be transferred are memories m2 to m5 (i2 i
5). Then, the memory controller 6 notifies the busy state to the image processing 1 and selects the input port start point register IN.
And the input ports i2, i3, i4 and i5 of the line data selector 3 are connected to the output ports O1, O2, O3 and O4, respectively (step 21).

If g = H continues, the transfer can be performed three times at this stage. Therefore, the memory controller 6 proceeds through steps 15, 16, 17, 18, 11, and 14 while moving the line of interest. The transfer is repeated three times. g =
In the case of L, only transfer is performed without advancing the line of interest (skip from step 15 to step 18). If the last line of the four-line batch transfer does not exist in the line memory 2, this is detected in step 11 and the image processing 1
When the image processing 1 outputs 4 lines of data, each line image data (i5 to i7) of the line memories m5 to m7 and a new The foremost line among the four lines is output to the scaling correction device 4. At this time, memories m5, m6 and m7
Is written into the memories m1, m2 and m3, and the original image data 4 is stored in the memories m4 to m7.
Each line image data of the lines L5 to L8 is written (step 20). When the control signal h is switched to H (reduced), this is detected in step 14 and the process jumps to step 29 in FIG.

As described above, when the control signal h = L (enlargement), the variable-magnification controller 5 responds to the control signal g given on a line-by-line basis. Clement is performed, and the line of interest, one line before and two lines after the line of interest are transferred to the scaling correction device 4 (steps 15 to 17, 18, 11 to 1).
3: (a) and (b) of FIG. If the control signal g is L, the transfer of the four lines is performed without advancing the line of interest (steps 16 and 17 are skipped; FIG. 4B). When the last line of the four lines to be transferred does not exist in the line memory 2, it waits for the previous processing unit 1 to output four new lines. (Steps 11, 19A, 19B, 20, 21).

Referring to FIG. Control signal h = H (reduced)
When the output of the image data of one page is started, the memory controller 6 proceeds from step 7 of FIG. 2 to step 22 of FIG. 3, advances the line of interest, and The line selection port is also advanced (step 23). It is checked whether at least part of the selected port is out of the line memory 2 (step 24). If not, the control signal g is referred to (step 25). If the control signal g is L, this data output is not performed, and the process proceeds to read the control signals h and g provided by the variable power controller 5 (step 26). 27). If the control signal h = H (reduction) continues, the target line is incremented by one (steps 28 and 29), and the four-line selection port is advanced (step 30).

When any one of the four line image data to be transferred next does not exist in the line memory 2, the ready is notified to the processing unit 1 (step 32A). (32B), and if the control signal g = H, the processing device 1
Each line image data (i5 to i7) of the line memories m5 to m7 in synchronization with simultaneous output of line data.
Is output to the scaling correction device 4. At this time, the line image data of the memories m5, m6 and m7 are simultaneously stored in the memories m1, m2 and m7.
3 and the original image data is stored in each of the memories m4 to m7.
The line image data of the four lines L5 to L8 are written (step 34). When the control signal g = L,
Reading and writing of line image data to and from the line memory 2 are performed in the same manner, but no image data is output to the scaling correction device 4 (step 35). When the reading and writing of the line image data to the line memory 2 are completed, the memory controller 6 notifies the busy to the image processing 1 and writes the input port i2 to the selected input port start point register IN. Input port i of line data selector 3
2, i3, i4 and i5 are connected to output ports O
1, O2, O3 and O4 (step 3
6).

Next, the memory controller 6 executes step 2
Steps 7 to 31, 24, 25, and 26 are repeated three times while advancing the line of interest (step 29). During this time, when g = H, the four lines are simultaneously transferred to the scaling correction device 4 (step 26), and when g = L, this is not performed. That is, step 26 is skipped. Next, when the last line of the four lines to be transferred does not exist in the line memory 2, this is detected in step 24, and the above-described steps 33 to 36 are performed. When the control signal h is switched to L (enlargement), this is detected in step 28, and the process jumps to step 15 in FIG.

As described above, if the control signal h = H (reduced), the variable-magnification controller 5 responds to the control signal g given in units of lines, and if it is H, the line of interest and its A total of four lines, one line before and two lines after, are transferred to the magnification correcting device 4 (steps 26 and 3).
4) Then, the line of interest is incremented (steps 29 and 30; FIG. 5). If the control signal g is L, the line of interest is advanced, but the transfer of the four lines to the scaling correction device 4 is not performed (skip step 26, step 3
5; FIG. 5). When any of the four lines to be transferred does not exist in the line memory 2, the processing unit 1 waits until the preceding processing unit 1 newly outputs four lines, and if the control signal g = H, the processing unit 1 Simultaneously outputs four lines to the scaling correction device 4 when outputting four lines (step 34). However, when the control signal g = L, the transfer to the scaling correction device 4 is not performed (step 34). 35).

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of a functional configuration according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a part of an outline of line image data transfer control of a memory controller 6 shown in FIG.

FIG. 3 is a flowchart showing the rest of the outline of line image data transfer control of the memory controller 6 shown in FIG.

FIG. 4 (a) shows a magnification controller 5 giving a control signal h = L (enlargement instruction) to a memory controller 6, and further giving another control signal g as H continuously. The output image data of the preceding image processing 1 and the image data output by the data selector 3 to the scaling correction device 4 when the instruction of substantially the same magnification is indicated by the line number on the original image. It is a time chart. (B), the variable power controller 5 supplies a control signal h = L (enlargement instruction) to the memory controller 6 and switches another control signal g to H and L,
A time chart showing the output image data of the preceding image processing 1 and the image data output from the data selector 3 to the scaling correction device 4 by the line number on the original image when the magnification of / 2 is enlarged. -

FIG. 5 is a magnification controller 5 is a memory controller 6
, A control signal h = H (reduction instruction), and the other control signal g is switched between H and L to reduce ２, and output image data of the preceding image processing 1; This is a time chart showing the image data output from the data selector 3 to the scaling correction device 4 by the line number on the original image.

[Explanation of symbols]

 2: Line memory

Claims (4)

[Claims] 1. A memory means for storing image data for a plurality of n lines simultaneously inputted and having a capacity of not less than n lines; image data of not less than n lines of said memory means and a plurality of simultaneously inputted image data. means for selecting and simultaneously outputting image data for a plurality of m lines from image data for n lines in accordance with line output control information; and inputting line image data in accordance with a designated magnification Means for generating line output control information of the data, applying the generated line output control information to the simultaneous output means, and performing scaling processing on the image data output by the simultaneous output means. 2. The apparatus according to claim 1, wherein the simultaneous output means changes the line of interest in the gap between the simultaneous input of the image data of a plurality of n lines and changes the image data of a plurality of m lines around the line of interest. 2. The image data scaling device according to claim 1, wherein simultaneous output of data is performed a plurality of times. 3. The line output control information includes information indicating whether the image is enlarged and information indicating whether the output line is updated;
The simultaneous output means outputs the output line No. when the line output control information is expanded and the output line is updated. 2. The image data according to claim 1, wherein the image data for a plurality of m lines is output by performing the above operation, and when the output line is not updated, the image data for a plurality of m lines output immediately before is output again. Magnification device. 4. The line output control information includes information indicating whether or not the image is reduced and information indicating whether or not the line is thinned out. The simultaneous output means includes a plurality of lines when the line output control information is reduced and the line is thinned out. The output of the image data for the line is stopped, and the output line No. When line thinning is not performed, image data for a plurality of m lines is output and output line No. 2. The image data scaling device according to claim 1, wherein: