JPH0392974A - Picture expansion display device - Google Patents

Abstract

PURPOSE:To expand and display a picture in a window to perform alignment with one picture element as the unit by providing picture element data updating means which update the column address of picture data by outputs from main scanning- direction and subscanning-direction expansion magnification setting means. CONSTITUTION:First and second main scanning-direction expansion magnification setting means which set main scanning-direction expansion magnifications of a first picture element block and second and following picture element blocks in the main scanning direction in the window and first and second subscanning-direction expansion magnification setting means are provided. A first picture element data updating means which receives the output from the main scanning-direction expansion magnification setting means to update the row address of a picture element data and a second picture element data updating means which receives the output from the subscanning- direction expansion magnification setting means to update the column address of picture element data are provided. Thus, the picture in the window is shifted with one picture element as the unit in the horizontal direction and the vertical direction, and the expanded and displayed picture in the window and the picture on the outside of the window are aligned with one picture element as the unit in horizontal and vertical directions.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image enlargement display device that can align an image outside a window with an enlarged image inside a window on a display screen.

<Prior Art> Conventionally, there is a layout processing system using an image processing system having an image display function and an image processing function. This layout processing system uses an input device such as a mouse or tablet while looking at the system's display screen to enlarge and translate the image on the display screen, and place it in an appropriate position among other images. A fitting process, a so-called layout process, is performed. Figure 8.9.10 shows an example of such layout processing. That is, FIG. 8 is an image showing the inside of the room, that is, a display screen displaying the background. Furthermore, FIG. 9 shows a display screen displaying only images of a television receiver. 9th
In the figure, 100 is the image of the television receiver, and the shaded area lo
t indicates a pixel area having a "transparent" attribute. “
In the pixel area 101 with the attribute of "transparent", when the image of the television receiver shown in FIG. 9 is superimposed and displayed on the background image of FIG. 8, the background image below is displayed transparently. Figure 10 shows an example of the layout result, and by operating an input device such as a mouse or tablet, the image on the television receiver, that is, 100 in Figure 9, is enlarged to twice the size and parallelized as appropriate. It is moved and inserted into an appropriate position in the background image showing the inside of the room as shown in the figure.In this way, layout processing is useful when placing furniture, electrical appliances, etc. in a room, for example. It is used for examination and interior design examination.Also, similar things can be done using images of outdoor scenery, buildings, trees, etc.
It is used in the field of architectural design to examine the layout of buildings, in the field of clothing design using images of fabrics and patterns, and in the field of industrial design.

On the display screen shown in Figure 1O, the enlargement and parallel movement of the television receiver are performed by operating an input device such as a mouse or tablet, but if the processing is not done at a sufficient speed, the so-called usability of the user will be affected. not good.

For this reason, it is expanded. Parallel movement is not performed by actually rewriting the contents of the image memory by a processing device such as a CPU, but by using the enlargement function of the image memory. This can be done quickly using the scroll and window functions. As described above, according to the image memory having the above function, the setting value of the register specifying the enlargement magnification, the setting value of the register specifying the display position of the screen or window, and the setting value of the register specifying the display start address of the screen or window can be set. Images can be processed at high speed by simply changing a few bytes of data such as setting values.

FIG. 14 schematically shows a circuit equipped with such an image memory and capable of processing enlargement and translation at high speed. 1st
4, 160 is an image memory, and 16l is a signal for controlling the image memory 160, for example, a signal RAS,
A memory control signal generation circuit 162 generates CAS, WE, OE, etc., and an address generation circuit 162 generates an address to be given to the image memory 160. This address generation circuit 162 updates the vertical address if the input signal is "enable" or "high" when the horizontal retrace period starts, and otherwise does not update the vertical address. , generates the same address as in the previous scan line. 169 is a vertical enlargement circuit for performing enlarged display in the vertical direction (sub-scanning direction), and when the enlargement magnification is m (integer), a horizontal retrace period starts once every m scanning lines. When the output signal “enable” is “High”
163 is a parallel-to-serial conversion circuit that takes in the incoming data at a time and sequentially outputs data one pixel at a time, and 164 is a parallel-to-serial conversion circuit that sequentially outputs data one pixel at a time from the parallel-to-serial conversion circuit 163 to an A/D conversion circuit (not shown). It is a buffer that controls whether or not to output. Also, 165 is a timing generation circuit that generates timing signals such as synchronization signals and image display periods, and 166 is a memory control signal generation circuit 161.Address generation circuit 162 and vertical expansion. 167 is a serial output clock generation circuit, and 168 is a horizontal expansion circuit.The serial output clock generation circuit 167 and the horizontal expansion circuit 168 are connected to The serial output clock generation circuit 167 thins out the "serial output clock" that sends out display pixel data in order to perform enlarged display in the horizontal direction (main scanning direction). ``, the input signal clock f is output as a ``serial output clock'' while the output signal ``k'' is kept at ``Low''. When the magnification factor is n, the horizontal magnification circuit +68 outputs the output signal “enable” for one clock period every n clocks.
gh”.

FIG. 15 illustrates the display timing in 1 frame period (1 field period in the case of inclace display). The horizontal axis shows the passage of time when scanning in the main scanning direction, and the vertical axis shows the passage of time in the sub-scanning direction. Rectangle 170 is the whole. The shaded area +71 is the vertical retrace period, and the shaded area! 72 is a horizontal retrace period. The area +73 178 indicates the basic display period of two windows or the basic display period of the screen. The actual display period varies depending on how the "transparent" attribute is set for each pixel. The display period indicated by areas 173 and 178 is the timing generation circuit 1 in FIG.
Made by 65. The output “display period” signal of the timing generation circuit 165 becomes “High” in the area 173, that is, the “screen video display period” and in the display period of the area 178, that is, the “screen 2”.
The “vertical direction display period l” signal and the “horizontal direction display period 1” signal output from the area 173 shown in FIG.
That is, it becomes "High" during the display period of "Screen l".

The vertical direction display period signal starts from the start of the vertical retrace period.
After passing period 174, the signal is "High" during period 175, and after passing period 176 from the start of the horizontal retrace period, the signal is "High" during period 177.
The "vertical direction display period 2" signal and the "horizontal direction display period 2" signal output from the timing generation circuit 165 become "High" in the area 178, that is, in the "screen 2" display period.

When the period +74 has elapsed from the start of the vertical retrace period, the address generation circuit 162 generates an address for displaying the screen 1 during the period 175, and the timing generation circuit 1
The “vertical direction display period signal” output from 65 is “Hi”
The vertical address is updated only once every m scanning lines by the action of the vertical enlargement circuit 169 and the address generation circuit 162, and screen 1 enlarged vertically by m times is displayed. On the other hand, in the horizontal scanning within the period 175, when the period 176 has elapsed from the start of the horizontal retrace period, the address generation circuit 162 is activated during the period 177.
In this case, an address for displaying screen l is generated, and the horizontal direction display period B signal is maintained at "High", and the serial output clock generation circuit l67.Horizontal direction enlargement circuit +68
As a result, a signal obtained by dividing the frequency of the clock f by n is outputted to the real output clock, and a screen l enlarged by n times in the horizontal direction is displayed.

<Problems to be Solved by the Invention> By the way, the above-mentioned conventional technology has the following limitations. That is, one of them is that the window display start position on the display screen can only be set for every plural pixels. In the circuit shown in FIG. 14, the configuration is such that four pixel data are read out at a time from the image memory +60, so the window display start position cannot be set unless it is every four pixels.

Second, since the display start address of the screen to be displayed in the window cannot be set unless it is set at least every l pixel address, when the inside of the window is enlarged, for example, if the inside of the window is enlarged horizontally by 3 times, the horizontal The problem is that the display screen can only be scrolled in units of the number of pixels equal to the enlarged magnification, such as scrolling in units of 3 pixels only. Therefore, due to these constraints, layout processing is difficult using conventional techniques. Even if an attempt was made to inset a cropped image, there was a serious drawback in that when the inside of the window was enlarged, it was not possible to align the image inside the window with the image outside the window pixel by pixel. .

This is the first 1.1 2,! To explain this with reference to FIG. 3, in FIGS. 1f, 12, and 13, 130 is an image outside the window, and 131 is an image inside the window. The image 131 within the window is displayed enlarged three times in both the vertical and horizontal directions.

Of course, the horizontal magnification n=3 and the vertical magnification m=3. The shaded area 133 is a certain pattern (display image) on the screen within the window. Pixels in the area other than the shaded area 133 (non-display image) in the window have a "transparent" attribute, and are configured to be displayed through the background image 130. A shaded area 132 is a certain pattern (display image) on the screen outside the window.

Suppose that when you first open the window, the situation is as shown in Figure 1+. FIG. 12 shows an attempt to match the horizontal positions of the pattern 132 outside the window and the pattern 133 inside the window, and the horizontal display start address of the inside window display screen is increased by l. Since the inside of the window is expanded 3 times, even if you increase the display start address of the inside window display screen by 1, it will only be 3 times larger at once.
The patterns 132 and 133 are moved to the left by a pixel, and the horizontal positions of the patterns 132 and 133 cannot be made to match. On the other hand, FIG. 13 shows an attempt to match pattern 132 and pattern 133 by changing the display start address in the horizontal direction of the window on the display screen. I shifted the window display start address horizontally by 4 pixels to the left and vertically by 1 pixel, but even if I change the window display start address, the window display start position on the display screen remains horizontally by 4 pixels. Pattern 132 because it can only be moved by
．． 133 cannot be matched with each other in the horizontal direction with an accuracy of one pixel. Furthermore, since changing the window display start address may change the image, it is generally not possible to change the window display position for image alignment.

In this manner, in the conventional image enlargement display method, the image within the window is simply enlarged to predetermined enlargement magnifications in the horizontal and vertical directions, so that the image within the window is enlarged and displayed. When trying to move in parallel,
Even if you change the display address of the image displayed in the window by one in the image memory, it will move horizontally or vertically on the display screen by the number of pixels corresponding to the enlargement magnification. There is a problem in that the image within the window cannot be moved pixel by pixel because the image must be moved in units of pixel blocks each consisting of several pixels. On the other hand, the window display start position cannot be set in l pixel units as described above due to hardware constraints. Therefore, in the conventional image display method, there was a problem in that it was not possible to align the image outside the window and the image inside the window pixel by pixel.

Therefore, an object of the present invention is to be able to move an image within a window horizontally and vertically in units of one pixel, and therefore to move an enlarged image within the window and an image outside the window in units of one pixel. An object of the present invention is to provide an image enlargement display device that can be aligned horizontally and vertically.

<Means for Solving the Problems> In order to achieve the above object, the image enlargement display device of the present invention sets the main scanning direction enlargement magnification of the first pixel block in the main scanning direction within the window from 1 to n. a first main scanning direction enlargement magnification setting means, which sets the magnification to any value between;
a second main scanning direction enlargement magnification setting means for setting the main scanning direction enlargement magnification of the second and subsequent pixel block in the main scanning direction in the window to the above n; l-th sub-scanning direction enlargement setting means for setting the sub-scanning direction enlargement magnification of the blocks to any value between l to m; The row address of the pixel data is updated in response to the output from the second sub-scanning direction enlargement setting means for setting the scanning direction enlargement factor to m and the first or second main scanning direction enlargement setting means. and a second pixel data updating means that receives the output from the first or second sub-scanning direction enlargement setting means and updates the column address of the pixel data. It is characterized by

<Function> If the desired magnification of the displayed image in the window is, for example, 3 times in the main scanning direction and 2 times in the sub-scanning direction, the first main scanning direction enlargement setting means (hereinafter referred to as main scanning direction ) sets the main scanning magnification of the first pixel block in the main scanning direction to 3 times, and the second main scanning magnification setting means sets the main scanning magnification of the remaining pixel blocks to 3x. It is set to 3 times.

On the other hand, the first sub-scanning magnification setting means (hereinafter referred to as sub-scanning magnification setting means) sets the sub-scanning magnification of the first pixel block in the sub-scanning direction to twice, and the second The sub-scanning magnification setting means sets the sub-scanning magnification of the remaining pixel blocks to twice.

The first pixel data updating means receives the output from the first or second main scanning magnification setting means and updates the row address of the pixel data every three pixels according to the set magnification 3 in the main scanning direction. do. Further, the second pixel data updating means receives the output from the first or second sub-scanning magnification setting means, and updates the column address of the pixel data every two pixels according to the set magnification 2 in the sub-scanning direction. Update to.

At this time, if alignment in the main scanning direction or setting the same main scanning magnification of all pixel blocks as described above does not work, the first main scanning magnification setting means may be used to set the first pixel block The main scanning direction enlargement magnification is reset to 2x or 1x. By doing this, the enlarged display image inside the window can be aligned with the image outside the window with high precision in pixel units.

Positioning in the sub-scanning direction is similarly performed with high precision.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIGS. 1(a) and 1(b), 10 is a background image displayed by a large number of pixels 14, 14, . . . in a matrix on a display screen 9 of a display device such as a CRT, and l1
is a window opened at a predetermined position on the display screen 9. Here, the horizontal direction (see the X direction in Figure 1 (a))
is the main scanning direction, and the vertical direction (see the Y direction in FIG. 1(a)) is the sub-scanning direction. The main scanning is performed from the left to the right in the figure, and the sub-scanning is performed from the top to the bottom in the vertical direction.

FIG. 1(a) shows that the inside of window l1 is horizontal. 3 for the background image 10 outside the window in both vertical directions
The image is shown enlarged to twice the original size.

The shaded area l2 is the three first pixel blocks in the vertical direction within the window 11, and the shaded area 13 is the three i-th pixel blocks in the horizontal direction within the window 11. And Fig. 1(a)
The enlargement factor n (integer) of the first horizontal pixel block l3 in the window 11 is 3, which is the same as the enlargement factor n=3 of the second and subsequent horizontal pixel blocks in the window II. The enlargement magnification m (integer) of the first vertical pixel block l2 in window 1 is also 3, and window 1
Enlargement magnification m of the second and subsequent vertical pixel blocks in 1
= 3. The pixel block at the upper left corner in window II is the lth pixel block l2 in the vertical direction in window It, and the first pixel block in the horizontal direction in window II.
This is pixel block l3.

Due to circuit size constraints, the display start position of the window 11 can only be set for every four pixels, as in the prior art. Therefore, it is not possible to align the background image 1o and the image in the window 11 pixel by pixel only by changing the display start address of the window l1.

In FIG. 1(b), the horizontal magnification n of the first horizontal pixel block 13 in the window 11 is set to 1, and
By setting the vertical enlargement factor m of the first vertical pixel block 12 in the window It to 2, the image in the window 2 is shifted upward by l pixels from the state shown in FIG. It is shifted by two pixels. In this way, the first pixel block l3 in the horizontal direction within the window 11
By changing the horizontal magnification factor n of the window II and the vertical magnification factor m of the first vertical pixel block 12 in the window II, one pixel unit of the image inside the window Il with respect to the image outside the window II can be changed. horizontal and vertical alignment is possible (details will be described later).

FIG. 2 shows that by changing the horizontal magnification n of the first horizontal pixel block 13 in the window 11 and changing the vertical magnification m of the first vertical pixel block l2 in the window 11, This shows the result of aligning the position of the field answer in FIG.
This was done by changing the horizontal magnification n of the pixel block 13 from 3 to 1, and by changing the vertical magnification m of the first vertical pixel block l2 in the window from 3 to 2. However, the horizontal magnification n of the pixel blocks other than the first pixel block in the horizontal direction within the window is 3, which is the same as before alignment, and the magnification magnification m of the pixel blocks other than the first pixel block in the vertical direction within the window is also 3. 3 is the same as before alignment. Both the magnification of the second pixel block in the horizontal direction within the window and the magnification of the second pixel block in the vertical direction within the window are 3.
Therefore, here, the lth pixel block 13 in the horizontal direction
By setting the horizontal enlargement factor n to 1, 2, or 3, the position of the image within the window 11 can be shifted horizontally by l pixels, and the vertical magnification of the first pixel block l2 can be By setting the magnification factor m in the direction to 1.2 or 3, the position of the image within the window can be shifted in units of one pixel in the vertical direction. In Fig. 2, the pattern l'3 outside window 11
2 and the pattern in window 11 perfectly match horizontally and vertically. This alignment can be achieved by simply changing the horizontal magnification n of the first horizontal pixel block 13 within the window and the magnification m of the first vertical vertical pixel block l2 within the window.

Figure 5 (a), (b). (c). (d)
．． (e). (f) is a diagram sequentially showing the state when a window is enlarged three times (n=3m=3) in the horizontal and vertical directions and scrolled horizontally in units of 1 pixel. . Figure 5 (a), (b)
, (c), (d), (e). In (f), 170 is a background image, and 171 is an image in the window 11. An image of only the background image 170 in this case is shown in FIG.
Only the image in the window is shown in FIG. In FIG. 3, pixels in areas other than the hatched area 150 have a "transparent" attribute, and when the image in FIG. 3 is displayed superimposed on the background image in FIG. In some areas, the background image is transparent. If the display position of window it on the display screen can only be set every N pixels (
In the circuit shown in FIG. 14, the size of the window I1 in the direction in which the display position is set must be (N-1) pixels larger than what is to be displayed in the window 11 (N-4). (See Figure 3).

In FIG. 5, the pattern l50 (display section) of FIG. 3 is scrolled pixel by pixel from right to left in the order of FIGS. 5(a) to 5(f). FIG. 5(a) shows the display state of the hook. FIG. 5(b) shows a state in which only the horizontal magnification n of the first horizontal pixel block l3 in the window 11 is changed from 3 to 2 from the state of FIG. 5(a). Further, when the horizontal direction within the window 11 is changed lth from the state shown in FIG. 5(b), the state shown in FIG. 5(c) is obtained. FIG. 5(d) shows an image 171 displayed in window ll.
This is a combination of changing the display start address of , and changing the enlargement factor n of the first horizontal pixel block 13 in window 11. Set the display start address of image 171 to 1
, and the first horizontal direction in window l1.
The horizontal enlargement factor n of the pixel block 13 is returned to 3. Since the display start address of the image 171 displayed in window ll was increased by l,
) to (c), the second horizontal pixel block (however, the horizontal magnification n is different) is the first horizontal pixel block 13 in FIG. 5(d). . Figure 5(e) is the same as Figure 5(d).
), by decreasing the display start address of window 1l on the display screen by 1, the display start position of window 11 can be changed to 4 displayed images + 71, which is the minimum unit for setting the display start position of window 11.
The display start address of the image 9171 displayed in this window 11 is returned to the same value as in FIG. 5(c) by decreasing the display start address by 1. in this way,
Since the display start address of the image 171 displayed in the window 11 is reduced by 1, the image data of the first horizontal pixel block 13 in FIGS. This is the image data of the first pixel block 13 in the horizontal direction. FIG. 5(f) shows a state in which the horizontal alignment has been completed, that is, the pattern 150 of the image 171 displayed in the window ll and the pattern indicated by diagonal lines in the background image [70] completely match in the horizontal direction. This state can be obtained by changing only the horizontal magnification n of the first horizontal pixel block l3 in the window If from 3 to 2 from the state shown in FIG. 5(e). If you do the opposite of the above, you will be scrolling from left to right in units of one pixel.

In this way, the enlargement magnification of the first horizontal pixel block l3 in the window I1 is changed for each l from 1 to n' (integer) (where n' is the magnification of the pixel blocks after the second horizontal pixel block). The pattern 150 is scrolled in the horizontal direction pixel by pixel by appropriately changing the display start address of the image 171 displayed in the window 11 and changing the display start address of the window 11 on the display screen. be able to. In other words, the image outside the window 11 and the image inside the window 11 can be aligned in the horizontal direction pixel by pixel. Scrolling by one pixel in the vertical direction is similar to scrolling in the horizontal direction, so a description thereof will be omitted.

FIG. 6 shows the l-th pixel block 13 in the horizontal direction within the window.
This is an example of a circuit that enables enlarged display at different horizontal enlargement magnifications between pixel blocks and other pixel blocks. This circuit is a horizontal expansion circuit 1 of the conventional circuit shown in FIG.
It forms the main part of the circuit corresponding to 68.

In FIG. 6, 31 is a counter as a first pixel data updating means, 32 is a register as a first main scanning magnification setting means for setting the horizontal magnification n of the lth pixel block in the horizontal direction, and 33 is a counter as a first pixel data updating means; is a register serving as a second main-scanning magnification setting means for setting the horizontal magnification n' for the second and subsequent horizontal pixel blocks. The signal 34 is a pulse signal that informs the horizontal direction display start address of the window, and becomes "High" during the (2) clock period. This signal 34 can be generated from the "horizontal display period l" signal shown in FIG. 14 or a circuit that produces this signal. The signal 35 is a clock signal, which is a clock for the entire circuit that reads and outputs display pixels. This corresponds to "clock f" in FIG. Signal 36 is a signal indicating that the window is in the display start period. During the window display period, the signal 36 is "High". This signal 36
This corresponds to the "horizontal direction display period l" signal in the figure. signal 37
．． 30 is a write signal when writing a value to register 32.33. 38 is register 32.33
This is a data path for writing values to. Signal 39 is the carry output of counter 3l.

This signal 39 is used as an enable signal when performing a process of updating display pixel data to the next pixel data. When this signal 39 is “High”, the display pixel data is updated to the next pixel data, and when this signal 39 is “L”
ow", the display pixel data remains unchanged and is not updated. This signal corresponds to part of the "enable" signal that is the output of the horizontal enlargement circuit 168 in FIG. 14.
The circuit shown in the figure is a circuit for enlarging and displaying one window, and two circuits shown in FIG. 6 are required to display two screens as shown in FIG. 10. The "enable" signal at the output of horizontal expansion circuit 168 in FIG. 14 corresponds to the 39 OR of the output signals from these two circuits.

The operation of the circuit shown in FIG. 6 will be explained below. First, the signal 36 indicating the display period of the window 11 is counted by a counter circuit (not shown) to display start addresses and display periods in the vertical and horizontal directions. The output becomes "High" only during the display period. (2) During the horizontal scanning period, the signal 34 informing the display start timing of the window 11 becomes "High" for 1 clock period when the display of the window 11 is started by a circuit not shown here. Horizontal first in window
When the horizontal expansion magnification of the pixel block 13 is n, and the horizontal expansion magnification of other pixel blocks in the window is n°, the register 32 is set to the two's complement of the value n, and the register 33 is set to the value n. Set the two's complement of '. During the horizontal scanning period, an image outside the window I is first displayed (see Figure 15), and then the image outside the window I is displayed.
When the display period starts within 1, the signal 36 becomes "High" and the signal 34 also becomes "High". After 1 clock period, the signal 34 returns to "Low", but at this time, the register 32 is The value is loaded into counter 3l.

If the 4-bit binary number in the counter 31 is 1111, the carry output of the counter 3l is “High”
Therefore, the register 33 is output enabled and the LOAD input of the counter 3l is "Low", so when a clock is input to the counter 31, the value of the register 33 is loaded into the counter 3l.

If the 4Bits binary number in counter 31 is 1111
Otherwise, the carry output of the counter 31 is “Low”.
When a clock is input to the counter 3l, the counter 3l counts up. When the value reaches 1111, the register 33 is loaded.

After loading the value of the register 33, the counter 31 repeats the count-up operation until the value reaches 1111, and when the value reaches 1111, the value of the register 33 is loaded again. Then, the operation of loading the value from the register 33 and counting up is repeated until the display period of the window 11 in one horizontal scanning period ends. When the output signal 39 of the counter 3I is "High", the display pixel data is updated to the next pixel data as described above.

When the setting value of register 32.33 is 1111, that is, when n and n° are 1, signal 39 is always “H”.
igh", and the display pixels are updated every clock. That is, the horizontal magnification factor n is l.

In this manner, the display period of the first horizontal pixel block l3 within the window, that is, the horizontal expansion magnification n of the first pixel block l3 is determined by the register 32 by the circuit shown in FIG.
The display period of other pixel blocks, that is, the horizontal expansion magnification n is determined by the setting value of register 3.
It is determined by the setting value of 3. During the above-mentioned horizontal scrolling in pixel units, the horizontal expansion magnification n (n is an integer) of the first horizontal pixel block l3 is changed by l from l to n''.

FIG. 7 is an example of a circuit that enables enlarged display of the first vertical pixel block in the window and the other pixel blocks at different horizontal enlargement magnifications. This circuit is a vertical expansion circuit 169 of the conventional circuit shown in FIG.
It forms the main part of the circuit corresponding to .

In FIG. 7, 4l is a counter as a second pixel data updating means, 42 is a register as a first sub-scanning magnification setting means for setting the vertical magnification m of the first display pixel 12 in the vertical direction; A register 43 serves as a second sub-scanning magnification setting means for setting the vertical magnification m° of other display pixels. signal 44
is a signal indicating the vertical display period of the window.

This signal 44 can be generated from the "vertical direction display period l" signal shown in FIG. 14 or a circuit for generating it. The signal 45 is a signal that generates one pulse during the horizontal blanking period at a rate of one pulse per one horizontal scanning line, and is a clock signal for counting up the counter 41 or loading data. Signal 46 is a signal indicating that the window is in the display period.

In the period of one frame (or field), the signal 46 is "High" during the horizontal scanning period including the window display period. This signal 46
This corresponds to the “vertical direction display period signal” in the figure.

If the signal 46 is not "High", the counter 4l will not count up even if the pulse of the signal 45 is input. This signal 46 is input to the enable terminal of the counter 4l. Data loading is performed regardless of the value of signal 46. Signal 47.40 is connected to register 42.40.
This is a write signal when writing a value to 43. Data path 48 is a data path for writing values to registers 42.43. The signal 49 is the counter 41
is the carry output of The signal 49 is used as an enable signal when updating an address when reading pixel block data. When the signal 49 is "High", the vertical address of the atlas for reading out pixel block data is updated when the horizontal scanning period ends, and when the signal 49 is "Low", the vertical address is updated. , unchanged as before.

This signal 49 corresponds to a portion of the "enable" signal that is the output of the vertical expansion circuit 169 in FIG. The circuit shown in FIG. 7 is a circuit for enlarging and displaying one window, and two circuits shown in FIG. 7 are required to display two windows as shown in FIG. 10. The "enable" signal, which is the output of the vertical expansion circuit 169 shown in FIG.
Corresponds to the logical sum of

The operation of the circuit shown in FIG. 7 will be explained below. First, the signal 46 indicating the display period of the window l1 is counted by a counter circuit (not shown) for the display start address in the vertical direction and the display period. The output is “High” only during the horizontal scanning period including the I1 display period.
h". The signal 44 that informs the start of the l frame (or the ■ field) becomes "Low" during the vertical retrace period by a circuit not shown here. The first vertical pixel block l2 in the window When the vertical expansion magnification of the other pixel blocks in the m1 window is m゛, the register 42 is set to the two's complement of the numerical value m, and the register 43 is set to the two's complement of the numerical value m゛. Set the complement.In one frame (or one field) period, first, the signal 44 becomes "Low" during the vertical retrace period, and when the clock 45 output every l horizontal scanning period is input, the register 42 is loaded into the counter 4l. When the vertical retrace period has passed, no window is displayed at first, and when the horizontal scanning line that includes the window display period begins, the signal 46 goes high. , counter 41 for each horizontal retrace period
is being counted up. If the 4-bit binary number in the counter 41 is 1111, then the counter 4l
The carry output of register 43 becomes “High”.
becomes output enable, and L of counter 4l
Since the OAD input is “Low”, the counter 4
When the clock 45 is input to l, the value of the register 43 is loaded into the counter 41.

After loading the value of Renoster-43, the counter 41 repeats the count-up operation until the value reaches 1111, and then the value reaches 1. When it becomes 1 1 1, it's Renoster again.
Load the value of 43. In one frame (or ■ field), the operation of loading the value from the register 43 and counting up is repeated until the display period of the window ends. Output signal 49 of counter 4l
is "High", among the addresses for reading display pixels, the vertical address is updated to the address of the next line.

When the set value of the registers 42 and 43 is 1111, the signal 49 is always "High" and the vertical address is updated every l horizontal scanning line. At this time, the vertical magnification is l. Furthermore, when displaying increments, the circuit needs to be devised so that the vertical address is updated by two.

As described above, with the circuit shown in FIG. 7, the vertical enlargement magnification m of the vertical first display pixel block 12 within the window is determined by the setting value of the register 42, and the vertical enlargement display magnification m of the other display pixels is determined. is determined by the set value of the register 43.

When scrolling in the vertical direction pixel by pixel, the vertical enlargement magnification II (II1
is an integer) is changed by 1 between 1 and 1.

Note that the circuit that enables the enlarged display of the l-th pixel block l3 in the horizontal direction in the window and the other pixel blocks at different horizontal enlargement magnifications is not limited to that shown in FIG. It goes without saying that the circuit that allows the pixel block l2 and other pixel blocks to be displayed in an enlarged manner at different horizontal enlargement magnifications is not limited to that shown in FIG.

Effects of the Invention> As is clear from the above, according to the present invention, enlarged display in the main scanning direction within a window is performed by converting pixel blocks other than the first pixel block in the main scanning direction within the window to pixels outside the window. while enlarging the l-th pixel block in the main scanning direction in the window to a desired magnification between 1 and n in the main scanning direction, and In the internal sub-scanning direction enlarged display, pixel blocks other than the first pixel block in the sub-scanning direction within the window are enlarged m (integer) times in the sub-scanning direction relative to pixels outside the window, while The first pixel block is enlarged in the sub-scanning direction to a desired magnification between 1 and m. Therefore, according to the present invention, an image is displayed within the window in the main scanning direction.
Of course, it is possible to enlarge the image by a factor of m in the sub-scanning direction as well as display it by a factor of m in the sub-scanning direction. Alignment can be performed in the main scanning direction and the sub-scanning direction in l pixel units, without having to be in units of multiple pixels.

[Brief explanation of drawings]

Figure 1(a). (b) is an explanatory diagram of the display method by the enlarged display device of the present invention, and FIG. 2 is an explanatory diagram of the horizontal magnification of the first pixel block in the horizontal direction within the window and the vertical magnification of the first pixel block in the vertical direction within the window. Figure 3 is an example of a screen that is inserted into the background screen when performing layout processing. Figure 4 shows an example of a background screen when performing layout processing, Figure 5 (a)
．． (b), (c). (d), (e).
(f) is an explanatory diagram of scrolling in units of 1 pixel in the main scanning direction by the image enlargement display method according to the present invention, and Fig. 6.7 is a circuit diagram of an image enlargement display device according to an embodiment of the present invention, respectively. 8 is a diagram of an example of a background screen when performing layout processing, FIG. 9 is a diagram of an example of an image to be inserted into the background screen when performing layout processing, and FIG. Diagram of the layout of the image in Figure 11.1
Figure 2.13 is an explanatory diagram showing that it is not possible to align the image outside the window and the enlarged image inside the window in l pixel units depending on the conventional image enlargement display method.
This figure is a schematic diagram of a circuit that realizes a conventional image enlargement display system, and FIG. 15 is an explanatory diagram of the timing of the retrace period and the display period in the l frame (or! field) period. 10, 130, 170...Image outside the window (background image), II...Window, 12...First vertical pixel block in the window, l
3...First horizontal pixel block in window, +4
...Pixels, 131.171...Enlarged image in the window, 133.150...Display part (pattern) of the enlarged image in the window, X...Horizontal direction, Y... ··Vertical direction. Patent applicant: Sharp Corporation Agent
Patent Attorney Aoyama Aoyama Figure 3 Figure 4 Figure 5 (C) +70 Figure 5 (d) Figure 5 (e) Figure 5 (f) 170 I3u Figure 8 Figure 9 Figure 10 figure

Claims (1)

[Claims] (1) An image enlargement display device capable of aligning an image outside the window with an enlarged image inside the window on a display screen, the main scanning of the first pixel block in the main scanning direction within the window. a first main scanning direction enlargement setting means for setting a direction enlargement factor to any value between 1 and n (an integer); and main scanning of the second and subsequent pixel blocks in the main scanning direction within the window. a second main-scanning direction enlargement setting means for setting a direction enlargement factor to n; and a second main-scanning direction enlargement setting means for setting a sub-scanning direction enlargement factor of the first pixel block in the sub-scanning direction within the window from 1 to m (an integer). a first sub-scanning direction enlargement magnification setting means for setting the sub-scanning direction enlargement magnification to one of the values m; scanning direction magnification setting means; first pixel data updating means for updating a row address of pixel data in response to an output from the first or second main scanning direction magnification setting means; An image enlargement display device comprising: second pixel data updating means for updating a column address of pixel data in response to an output from the second sub-scanning direction enlargement magnification setting means.