JP3788563B2 - Image data scaling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to electrical scaling processing of image data for image scaling, and more specifically, although not intended to be limited to this, a plurality of n lines can be processed for high-speed or high-definition image reading. In order to perform high-speed processing of image data generated on a computer, not only original image data, but also to simultaneously generate digital data in parallel and simultaneously process multiple image readings, Alternatively, in order to perform processing referring to two-dimensional luminance or density distribution, image data for a plurality of n lines is simultaneously given to the processing stage, or the image data is output simultaneously from the processing stage. The present invention relates to an apparatus for performing a magnification change process on an image. 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. that scales image data (digital image information) by digital logic processing.
[0002]
[Prior art]
  In Japanese Patent No. 2789560, single line reading is repeatedly performed by an original scanner, a video signal is converted into digital data, that is, image data, shading correction is performed on the image data, and scaling processing in the main scanning direction is performed. Image data processing that performs MTF correction, scaling processing in the sub-scanning direction, and MTF correction, and further adds recording processing to the printer is disclosed. Several types of digital scaling processing are described in detail, and scaling processing that simultaneously performs scaling and MTF correction that compensates for degradation of image quality due to the scaling is also described.
[0003]
  Japanese Patent No. 2582058 discloses a line memory having a capacity of at least one scanning line, a magnification controller, a magnification process, and first to third selectors in order to easily perform an electric magnification process of image data. A zooming control device combining the above is disclosed.
[0004]
[Problems to be solved by the invention]
  However, in any case, since the scaling process assumes sequential input of single-line image data, a plurality of n lines of image data are output simultaneously in parallel from the image data processing preceding the scaling process stage. It cannot be applied.
[0005]
  By the way, in the high-precision scaling in the sub-scanning direction, it is necessary to refer not only to the processing target line (target line) updated one after another, but also to the image data of the neighboring lines. Line image data is required. Similarly, in the MTF correction process, several lines of image data centered on the target line are required. Therefore, the fact that a plurality of n-line image data can be obtained simultaneously in parallel with the image data processing in the previous stage means that, on one side, MTF correction that compensates for high-precision scaling or high-precision scaling and image quality degradation due to scaling. There is also an advantageous aspect for realizing simultaneous batch processing.
[0006]
  The first object of the present invention is to provide a zooming apparatus suitable for the case where the preceding stage of the zooming process stage outputs image data of a plurality of n lines simultaneously in parallel. A second object of the present invention is to provide a scaling device suitable for high-precision scaling processing that requires image data and simultaneous batch processing of scaling and MTF correction.
[0007]
[Means for Solving the Problems]
  (1) Multiple linesofimage dataImage processing means for performing image processing on the image and outputting it as first image data (1) The firstImage dataAs second image dataStoring memory means (2);A predetermined number of lines from the first and second image dataSelect to outputoutputMeans (3, 6); and the output meansByoutputMulti-lineScaling the image dataMagnificationMeans (4,5);The output means is line output control information. (h, g) In accordance with the above, a target line as a center of the plurality of lines to be output is set, and a selection process is performed to select image data for the number of lines that can be processed by the scaling unit based on the target line, and the target line is changed. And repeating the selection process.A scaling device for image data.
[0008]
  In addition, in order to make an understanding easy, the code | symbol or corresponding matter of the corresponding | compatible element of the Example shown in drawing and mentioned later is added in the parenthesis for reference.
[0009]
  According to this, the memory means (2) has more than the preceding n lines (7 lines) until the previous writing.SecondThere is image data, and this time input for multiple n lines (4 lines)FirstWhen combining the image data, arbitrary multiple lines of image data of 2n lines or more (11 lines), OutBy force means (3, 6)Double handCan be given to stage (4,5). Therefore, strangeDouble handThe stage (4, 5) can perform high-precision scaling in the sub-scanning direction that requires several lines of image data centered on the target line, and immediately before or immediately after or simultaneously with scaling. It is possible to perform MTF correction that simultaneously requires several lines of image data centered on the line of interest. In other words, before the scaling process stageImage processing means (1) byIt is possible to realize a highly accurate scaling process suitable for a case where a plurality of n lines of image data are output simultaneously in parallel with the image data processing.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  (2)SaidLine output control information includes information (h) indicating whether the image is enlarged (h = L) (h = H) and information (g) indicating whether the output line is updated (g = H) (g = L). Including;SaidOutput means (3, 6), when the line output control information (h, g) is expanded (h = L) and the output line is updated (g = H)Repeat the selection process(Fig. 2, Fig. 4 (b))It is characterized byThe image data scaling device described in (1) above.
[0011]
  According to this, strangeDouble handStage (4,6) is line output control information (h, g)OutBy controlling the force means (3, 6), duplicate (repeated) output of the same line image data in the case of enlargement is performed to each line, and image data of the number of lines corresponding to the required enlargement magnification is simultaneously output means ( Can be obtained from 3,6).
[0012]
  For example, when the magnification is 3/2 (h = L),Double handStage (4,5) is a variable with the first and second lines of the original image as the target line.Double handWhen inputting image data to stage (4, 5), update output line (g = H)The OutOutput line update rejection (g = L) when input to the second line is finished.OutIs applied to the force means (3, 6), and the third and fourth lines of the original image are used as the target line.Double handWhen inputting image data to stage (4, 5), update output line (g = H)OutOutput line update rejection (g = L) when input to the fourth line is finished.OutOutput line update rejected (g = L) every time input of even-numbered lines of the original image is finished, such as giving to the power means (3, 6)OutThe output of the output line update necessity signal is performed by repeating the input of the even-numbered line input immediately before the input to the output means (3, 6), that is, in accordance with the switching of the lines of the original image data. By switching g to H, H, L, H, H, L,..., the image data of the number of lines for 3/2 enlargement processing is changed.Double handCan be input to stage (4,5). StrangeDouble handSelection process of duplicate extraction line of stage (4,5), OutBoth the actual line selection processes of the force means (3, 6) are simple.
[0013]
  (3)SaidLine output control information (h, g) indicates information (h) indicating whether the image is reduced (h = H) or not (h = L) and whether or not line thinning (g = L) is determined (g = H) Including information (g);SaidOutput means (3, 6) is when line output control information (h, g) is reduced (h = H) and line thinning (g = L)Repeat the selection processAn image data scaling device according to (1) above, characterized in that:
[0014]
  According to this, strangeDouble handStage (4,5) is line output control information (h, g)OutBy controlling the force means (3, 6), thinning out the predetermined lines in the case of reduction, image data of the number of lines corresponding to the required reduction magnificationOutIt can be obtained from the force means (3, 6).
[0015]
  For example, in the case of 2/3 reduction (h = H)Double handStage (4,5) is a variable with the first and second lines of the original image as the target line.Double handWhen inputting image data to the stage (4, 5), the line skipping rejection (g = H)outputGiven to the means (3,6), when the input of the second line is finished, line thinning (g = L)OutIs applied to the force means (3, 6), and the third and fourth lines of the original image are used as the target line.Double handWhen image data is input to stage (4, 5), line thinning is rejected (g = H)OutTo the force means (3, 6), and when the fourth line is finished, the line is thinned out (g = L)OutEach time the input of the even-numbered line of the original image is finished, the line is thinned out (g = L).OutBy applying the thinning out of the third, sixth, ninth,... Lines, that is, in accordance with the switching of the lines of the original image data, By switching to H, H, L, H, H, L,..., The image data of the number of lines for 2/3 reduction processing is changed.Double handCan be input to stage (4,5). StrangeDouble handSelection process of thinning line of stage (4,5), OutThe actual line thinning process of the force means (3, 6) is simple.
[0016]
  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.
[0017]
【Example】
  FIG. 1 shows a functional configuration of an embodiment of the present invention. To the zooming device 7 of this embodiment, four adjacent lines of image data are simultaneously provided in parallel from the previous image processing 1. The image processing 1 is a process for correcting shading of image data obtained by digitally converting a video signal read by a document scanner, for example. However, since the scaling process of the image data can be performed at an arbitrary position in the flow of the image data, the input image data of the scaling apparatus 7 of the present embodiment is not limited to the shedding correction output.
[0018]
  2 is a line memory having memory areas m1 to m7 for 7 lines, 3 is a line data selector, 4 is a variable power correction device, 5 is a variable power controller, and 6 is a line memory controller. The four lines of image data simultaneously output by the image processing 1 are output to the input ports i8 to i11 of the line data selector 3 and are written to m4 to m7 of the line memory 2. At this time, the line image data of m1 to m7 are output to the selectors i1 to 17, 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.
[0019]
  The line data selector 3 performs data bus selection connection for outputting image data arriving at four input ports (four of i1 to i11) designated by the line memory controller 6 to output ports O1 to O4. It is. The image data of the output ports O1 to O4 is given to the magnification correction device 4.
[0020]
  In the following, the image data output by the preceding image processing 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 correction device 4 is referred to as post-magnification image data. However, in the case of the same magnification, image data processing for substantial image enlargement / reduction is not performed. However, the MTF correction processing corresponding to the magnification (in this case, for equal magnification) has been performed.
[0021]
  Which line of the line image data in the line memories m1 to m7 and the total of 11 lines (i1 to i11) of the original image data of 4 lines is to be given to the magnification correcting device 4 is enlarged (same size) When the line image data of the target line is in one of the line memories m2 to m5, four lines are prepared from the line memory 2 and read out. Do. When the line image data of the target line is in the line memory m6 or m7, 3 lines or 2 lines are prepared from the line memory 2 and read out. Here, the target line is one line to be subjected to the magnification correction by the magnification correction device 4, and in the following, the line numbers of the original image data such as L1, L2,. It expresses by.
[0022]
  The zoom correction device 4 has a built-in line memory for one input line. Line image data, and this line image data and the 4 lines of line image data input this time are combined into a total of 5 lines of image data. The image data is written twice, written three times), thinned out, that is, the image data is enlarged or reduced in the main scanning direction, and the pixel (image data) on the center line of five lines, ie, the pixel on the target line The target pixel (processing target pixel) is sequentially determined from the top pixel in the main scanning direction, and a 5 × 5 pixel matrix centered on the target pixel is partitioned on the 5-line pixel region. Then, the image data of the pixel at the sampling point corresponding to the designated magnification is substituted into the magnification correction formula corresponding to the designated magnification and simultaneously added with the MTF correction, and the corrected image data (image data after scaling) of the target pixel is substituted. ) Is calculated and output as the pixel of interest. At this time, the image data input to the magnification 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. Then, the image data after scaling is output (single line output) for one line corresponding to the target line.
[0023]
  4A shows the original image data line (the output line of the image processing 1 in the previous stage) and the output port O1 of the line data selector 3 at the same magnification (included in the enlargement in this embodiment). FIG. 4 (b) shows a case of 3/2 times enlargement, and FIG. 5 shows 2/3. This shows the case of reduction. On these drawings, a line that is filled with dots is a noticed line.
[0024]
  For example, the left end of FIG. 4A shows the first four lines L1 to L4 of an image of one page while the image processing 1 in the previous stage is outputting, and the most advanced line L1 is synchronized with the line of interest. The line image data in the line memory m7 (i7) (shown as blank because there is no actual image data at the top of the page) and the previous three lines L1 to L3 among the four lines L1 to L4 The line data selector 3 indicates that the data is output to the magnification correction device 4. At the same time, the line image data in the memories m5, m6 and m7 are written into 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 into the memories m4 to m7. .
[0025]
  In the right block, there is no image data output of the image processing 1 in the preceding stage, and during that time, the line of interest is changed to L2, and the image data of the four lines L1 to L4 of the line memories m4 to m7 is changed to the line data selector 3 It is shown that the data is output to the zoom correction device 4 via the input ports i4 to i7 and the output ports O1 to O4.
[0026]
  Next, the lines required by the magnification correction device 4 are L2 to L5 including the target line L3, but the line image data of L5 does not exist in the memory 2. Therefore, the memory controller 6 waits for the previous image processing 1 to output the next lines L5 to L8. When the image processing 1 outputs the next lines L5 to L8, the memory controller 6 synchronizes with the line memory m5. The line image data (i5 to i7) of L2 to L4 of .about.m7 and the first line L5 among the new four lines L5 to L8 are selected by the memory controller 6 and the line data selector 3, and the line of the original image data No. L3 is output to the zoom correction device 4 with the line of interest as the target line. At the same time, the line image data in the memories m5, m6, and m7 are written in the memories m1, m2, and m3, and the line image data for the four lines L5 to L8 of the original image data are written in the memories m4 to m7. . When this is completed, the line memories m1 to m7 have L2 to L8 line image data.
[0027]
  Based on these line image data, the transfer lines of L3 to L6 (i2 to i5), L4 to L7 (i3 to i6), and L5 to L8 (with L4, L5, and L6 as the target line) Since i4 to i7) can be transferred three times, the memory controller 6 performs these three transfers.
[0028]
  Thereafter, in the same manner, while the original image data of the next four lines (L9 to L12) is being output by the previous image processing 1, the four lines (L6 to L9) are used as the next line (L7). The processing image data is output (transferred) to the magnification correcting device 4, and when this is completed, the attention line is sequentially advanced and transferred three times. The same applies hereinafter.
[0029]
  In the case of 3/2 enlargement shown in FIG. 4B, for the odd-numbered lines of the original image data, processing data transfer for one line for four lines using the odd-numbered lines as a target line is performed. However, with respect to the even-numbered line of the original image data, the processing target data for two lines, which are used as the target line, is transferred to the magnification correction device 4. The control signal g is used for the two repetitive transfer instructions, which is generated by the magnification controller 5 and supplied to the memory controller 6. When the control signal g is H, the memory controller 6 advances the target line by one line, and transfers the processing target data of the preceding one line and the next two lines, a total of four lines, to the scaling correction device 4. However, when the control signal g is L, the processing line data transfer of the above four lines is performed to the magnification correction device 4 without advancing the target line. The magnification controller 5 switches the control signal g to H, H, L / H, H, L / H, H, L /... For each line when the magnification is 3/2.
[0030]
  The magnification change controller 5 alternately switches the control signal g between H / L and L / H every time the line is switched when the magnification is 2/1. As a result, the data transfer using each line of the original image data as the target line is repeated twice for each target line. When the magnification is 5/2, the control signal g is changed to H, L, H, L, H / H, L, H, L, H / H, L, H, L, H /.・ Switch to Multiple of 3 Only the line of No. 1 becomes the processing target data transfer of 4 lines at the same time, using it as the target line. This line is the processing target data transfer of four lines at the same time, with the line of interest as the target line. By manipulating the control signal g in this way, it is possible to transfer the processing target data at an arbitrary magnification.
[0031]
  At the time of 2/3 reduction shown in FIG. 5, the third line L3 of the original image data and its multiple No. For this line, the processing target data for four lines is not transferred once, with this line as the target line. Repeat for other lines. In the case of reduction, the control signal g is also used, but the instruction that the level L / H means is different from that in the case of enlargement. When the memory controller 6 is reduced (h = H), when the control signal g is H, the target line is advanced by one line, and the preceding one line and the following two lines, that is, a total of four lines. The processing target data is transferred to the magnification correction device 4. When the control signal g is L, the line of interest is advanced, but the four lines of processing target data are not transferred. That is, a multiple of 3 This line is thinned out from the attention line. The magnification changing controller 5 switches the control signal g to H, H, L / H, H, L / H, H, L /.
[0032]
  The magnification controller 5 alternately switches the control signal g between H / L and L / H every time the line is switched when the reduction is ½. As a result, data transfer is performed by thinning out even-numbered lines from the target line. At the time of 2/5 reduction, the control signal g is changed to H, L, H, L, L / H, L, H, L, L / H, L, H, L, L /.・ Switch to By manipulating the control signal g in this way, it is possible to transfer the data to be processed at an arbitrary reduction ratio.
[0033]
  The magnification controller 5 generates a control signal h of a low level L when it is equal or enlarged, and H when it is reduced, and this is combined with the above-described control signal g. This is given to the memory controller 6.
[0034]
  2 and 3 show an outline of input / output control of the line image data from the start point to the end of the one-page image data input of the memory controller 6. FIG.
[0035]
  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 the target line No. Register OLNo. 1 is written to indicate the first line (L1) (step2), The input port i7 is written to the selected input port start point register IN, and the input ports i7, i8, i9 and i10 of the line data selector 3 are connected to the output ports O1, O2, O3 and O4, respectively. Then, the ready is notified to the image processing 1 in the previous stage through the control signal line (step 3).
[0036]
  The controller 6 waits for the preceding image processing 1 to start outputting the four lines L1 to L4. When the controller 6 starts the output, the controller 6 writes the four lines L1 to L4 into the line memories m4 to m7 and m5 to m5. The data of m7 is written to m1 to m3, and the line data of the memory m7 and the line data of 3 lines L1 to L3 are output to the magnification correction device 4 according to the set connection (i7 to i10 / O1 to O4). (Step 5). This state is shown at the leftmost end in FIGS.
[0037]
  When this is completed for the entire line length, the controller 6 notifies the image processing 1 of busyness and reads the outputs h and g of the magnification controller 5 (step 6). If the control signal h is L indicating enlargement (including equal magnification), if the control signal g is H with reference to the control signal g, the target line No. 1 (steps 7 to 9), the outputs (i4 to i7 / O1 to O4) of the lines L1 to L4 with the target line as L2 are set (step 10), and this output is possible. Data (L1 to L4) in the memories m4 to m7 are read and output (steps 11 and 12). Then, the control signals h and g of the magnification controller 5 are read (step 13). If there is no change in the enlargement (h = L) (step 14), the level of g is referred to (step 15). 1 (Step 16), the transfer port of 4 lines to be transferred is also advanced by 1 (Step 17), the page end is checked (18), and if it is not the page end, the end of the extraction port is the line. It is checked whether or not the memory 2 is removed (step 11). Since the output from the image processing 1 in the previous stage is necessary when the line memory 2 is removed, the memory controller 6 notifies the image processing 1 of the ready (step 19A), and the image processing 1 detects the next four lines (L5 to L5). It waits for the output of L8) (step 19B).
[0038]
  When the image processing 1 outputs the next four lines (L5 to L8), the line image data (i5 to i7) of L2 to L4 of the line memories m5 to m7 and the new four lines L5 and 5 are synchronized with it. The first line L5 in L8 is designated as the line number of the original image data. L3 is output to the zoom correction device 4 with the line of interest as the target line. At the same time, the line image data in the memories m5, m6, and m7 are written in the memories m1, m2, and m3, and the line image data for the four lines L5 to L8 of the original image data are written in the memories m4 to m7. (Step 20). When this is completed, there are 7 lines (L2 to L8) of line image data in the line memories m1 to m7, and the data of the next line of interest is in the line memory m3 (i3) and should be transferred next. The four lines of data are in the memories m2 to m5 (i2 to i5). Therefore, the memory controller 6 notifies the image processing 1 of busy, writes the input port i2 to the selected input port start point register IN, and sets the input ports i2, i3, i4 and i5 of the line data selector 3 to the output ports O1, O2 respectively. , O3 and O4 (step 21).
[0039]
  If g = H continues, three transfers are possible at this stage, so the memory controller 6 repeats steps 15, 16, 17, 18, and 11-14 three times while advancing the line of interest. Transfer once. When g = L, only transfer is performed without advancing the line of interest (skip from step 15 to step 18). When the last line of the 4-line batch transfer is not in the line memory 2, this is detected in step 11, and the ready is notified to the image processing 1 (19A), and the image processing 1 sends the data of 4 lines. At the time of output, the line image data (i5 to i7) in the line memories m5 to m7 and the topmost line among the new four lines are output to the magnification correction device 4 in synchronization with the output. At the same time, the line image data in the memories m5, m6, and m7 are written in the memories m1, m2, and m3, and the line image data for the four lines L5 to L8 of the original image data are written in the memories m4 to m7. (Step 20). When the control signal h is switched to H (reduction), this is detected in step 14 and the process jumps to step 29 in FIG.
[0040]
  As described above, when the control signal h = L (enlargement), in response to the control signal g given by the scaling controller 5 in line units, if it is H, the increment of the line of interest is performed. The line of interest, the preceding one line and the following two lines, a total of four lines, are transferred to the magnification correction device 4 (steps 15 to 17, 18, 11 to 13; (a) and (b) of FIG. )). When the control signal g is L, the four lines are transferred without advancing the line of interest (steps 16 and 17 are skipped; FIG. 4B). When the last 4 lines to be transferred do not exist in the line memory 2, it waits for the processing apparatus 1 in the previous stage to output 4 lines, and when there is this output, simultaneously to the magnification correction apparatus 4. Is transferred (steps 11, 19A, 19B, 20, 21).
[0041]
  Please refer to FIG. When the output of one page of image data is started with the control signal h = H (reduction), the memory controller 6 proceeds from step 7 in FIG. 2 to step 22 in FIG. In addition, the 4-line selection port is also advanced (step 23). It is checked whether or not the selected port is out of the line memory 2 (step 24). If not, the control signal g is referred to (step 25), and if it is H, 4 lines of data are output. (Step 26) If the control signal g is L, this data output is not performed, and the control signal h, g given by the zoom controller 5 is read next (Step 27). If the control signal h = H (reduction) continues, the line of interest is incremented by 1 (steps 28 and 29), and the 4-line selection port is also advanced (step 30).
[0042]
  When any line image data of the four lines to be transferred is not present in the line memory 2, the processor 1 is notified of the ready (step 32A), which starts the simultaneous output of the four lines of image data. (32B), and if the control signal g = H, the line image data (i5 to i7) in the line memories m5 to m7 are synchronized with the simultaneous output of the four lines of data by the processing device 1. The topmost line among the new four lines is output to the magnification correction device 4. At the same time, the line image data in the memories m5, m6, and m7 are written in the memories m1, m2, and m3, and the line image data for the four lines L5 to L8 of the original image data are written in the memories m4 to m7. (Step 34). When the control signal g = L, the line image data is read and written in the line memory 2 in the same manner, but the image data is not output to the magnification 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 image processing 1 of busy, writes the input port i2 to the selected input port start point register IN, and inputs the input port i2 of the line data selector 3 , I3, i4 and i5 are connected to output ports O1, O2, O3 and O4, respectively (step 36).
[0043]
  Next, the memory controller 6 repeats steps 27 to 31, 24, 25 and 26 three times while advancing the line of interest (step 29). During this time, when g = H, four lines are simultaneously transferred to the magnification correction device 4 (step 26), and when g = L, this is not performed. That is, step 26 is skipped. Next, when the last four lines to be transferred do not exist in the line memory 2, this is detected in step 24, and the above-described processing in steps 33 to 36 is performed. When the control signal h is switched to L (enlarged), this is detected in step 28, and the process jumps to step 15 in FIG.
[0044]
  As described above, when the control signal h = H (reduction), in response to the control signal g given by the scaling controller 5 in units of lines, if it is H, the line of interest, the previous line, and The latter two lines, a total of four lines, are transferred to the magnification correction device 4 (steps 26 and 34), and the line of interest is incremented (steps 29 and 30; FIG. 5). When the control signal g is L, the target line is advanced, but the four lines are not transferred to the magnification correction device 4 (step 26 is skipped, step 35; FIG. 5). When any one of the four lines scheduled for transfer does not exist in the line memory 2, the processing apparatus 1 waits for the processing apparatus 1 in the previous stage to output four lines, and if the control signal g = H, the processing apparatus 1 4 outputs 4 lines simultaneously to the variable magnification correction device 4 (step 34), but if the control signal g = L, the transfer to the magnification correction device 4 is not performed (step 34). 35).
[Brief description of the drawings]
FIG. 1 is a block diagram showing an outline of a functional configuration of an embodiment of the present invention.
2 is a flowchart showing a part of the outline of line image data transfer control of the memory controller 6 shown in FIG. 1; FIG.
FIG. 3 is a flowchart showing the remainder of the outline of the line image data transfer control of the memory controller 6 shown in FIG. 1;
FIG. 4 (a) shows that the magnification controller 5 gives a control signal h = L (enlargement instruction) to the memory controller 6 and also gives another control signal g as H continuously. This is 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 magnification correction device 4 when the magnification instruction is given, by line numbers on the original image. (B) shows the case where the magnification controller 5 gives the control signal h = L (enlargement instruction) to the memory controller 6 and the other control signal g is switched between H and L to enlarge 3/2. This is a time chart showing the output image data of the previous image processing 1 and the image data output from the data selector 3 to the scaling correction device 4 by line numbers on the original image.
FIG. 5 shows a previous stage when the magnification controller 5 gives a control signal h = H (reduction instruction) to the memory controller 6 and the other control signal g is switched between H and L and reduced by 2/3. The output image data of the image processing 1 and the image data output by the data selector 3 to the magnification correction device 4 are time charts indicated by line numbers on the original image.
[Explanation of symbols]
  2: Line memory

Claims (3)

Image processing means for performing image processing on a plurality of lines of image data and outputting as first image data; memory means for storing the first image data as second image data ; the first and second output means for outputting from the image data by selecting the predetermined number of lines; and, scaling means for scaling the image data of a plurality of lines output by the output means; wherein the output means comprises line output In accordance with the control information, a target line that is the center of a plurality of lines to be output is set, and a selection process is performed to select image data for the number of lines that can be processed by the scaling unit based on the target line, and the target line The image data scaling device is characterized in that the selection process is repeated with the change made . It said line output control information includes information indicating whether information and output line update indicating the whether image enlargement; and the output means, the selection process when the line output control information is large and the output line update 2. The image data scaling device according to claim 1, wherein the image data scaling device is repeated . It said line output control information includes information indicating whether information and line-thinning indicates the reduction whether the image; and the output means, that the line output control information repeats the selection process when the reduced and line thinning 2. A zooming apparatus for image data according to claim 1, wherein:

Images