JPS60203989A - Raster scan graphic display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a dot representing the density of each dot on a display screen.
The present invention relates to a type of RuskScan graphic display device that controls the density of dots on a display screen based on the i11 degree angle.

Prior Art In conventional rask-scan graphic display devices of this type, a small area of one or more bits in the video memory corresponds to one dot on the display screen, and the density of each dot on the display screen is the same as the corresponding small area. Eri was determined only by internal data. For example, in a conventional device of this type, the density of each dot on the display screen 4 is controlled by the density signal 3 read out from the video memory 1, as schematically illustrated in FIG. 1 of the accompanying drawings. Now, focusing on one driver) 5e on the display screen 4,
The density signal 3 which determines the density of the dot 5e of interest is based only on the density signal representing the density of the dot 5e stored in the bit 2e of interest corresponding to the dot 5e in the video memory 1.

That is, this density signal 3 corresponds to the dots 5a, 5b, and 5c in the vicinity of the dot 5e of interest on the display screen 4.

5d, 5f, 5g, 5h and 51, respectively, in the video memory y) 2a, 2b.

It is completely unrelated to the density signals representing the density of each corresponding dot stored in 2c, 2d, 2f, 2g, 2h and 21. Conventional devices use density control like this, so in order to display an image that has been subjected to filter link processing such as smoothing or edge enhancement, it is necessary to change the image after that processing. All data had to be created and written to video memory. Therefore, if the contents of the filtering process to be applied to the same image are varied, it is necessary to rewrite the video memory each time, which has the drawback of increasing the processing load.

OBJECTS OF THE INVENTION In view of the problems of conventional devices as described above, an object of the present invention is to improve the processing efficiency of an image by applying filtering processing such as smoothing and edge enhancement to an image without increasing the processing load. An object of the present invention is to provide a rask scan graphic display device that can be easily displayed.

According to the present invention, in a rask scan graphic display device of the type that controls the density of dots on a display screen based on a dot density signal value representing the density of each dot on the display screen, In response to a corresponding dot density signal corresponding to one dot and representing the density of that dot and a neighboring dot density signal corresponding to dots in the vicinity of the one dot on the display screen and representing the density of those neighboring dots, the corresponding dot density is determined. A filter device is provided that sequentially outputs a density control signal for each corresponding dot by filtering the signal using the neighboring dot density signal to determine the density of the one dot on the display screen, and determines the density signal value for each dot. The density signal value for each dot is determined by filtering it by the density signal value for its neighboring dots.

Embodiments Next, the present invention will be explained in more detail with reference to FIGS. 2 and 3 of the accompanying drawings.

FIG. 2 is a schematic diagram showing a schematic configuration of an embodiment of a rask scan taraphic display device according to the present invention and for explaining its operating principle. As shown in FIG. 2, the scanning graphics display device of this embodiment includes a filter device 6 between the video memory 1 and the display screen 4, according to the invention.

The point that each bit of the video memory 1 stores a dot density signal value representing the density of each dot on the display screen 4 is the same as in the case of the conventional apparatus described above.

However, in the apparatus of this embodiment of the present invention, unlike the conventional apparatus, the density of one dot on the display screen 4 is determined only by the dot signal value stored in the bit in the video memory 1 corresponding to that dot. rather than the filter device 6
The density of each dot is determined using a value obtained by filtering the density signal value for each dot by the density signal value for its neighboring dots.

For example, focusing on the dot 5e on the display screen 4, the bit 2e of interest in the video memory 1 corresponding to the dot 5e of interest and the dot 5 in the vicinity of the dot 5e of interest
a, 5b, 5c, 5d, 5f.

5g, 5. Neighboring bits 2a, 2b, 2c, 2d in video memory 1 corresponding to h and 51, respectively.

The contents stored in 2f, 2g, 2h and 21 are read out, and the corresponding dot density signal 3e and neighborhood density signal 3 are respectively obtained.
a, 3b, 3c, 3d, jf, 3g.

3h and 31 are manually applied to the filter device 6.

The filter device 6 generates a density control signal 7 by weighting and averaging these signals 3a to 31, and generates a density control signal 7.
Accordingly, the density of the target image (5e) on the display screen 4 is determined. Since the filter device 6 may be a normal weighted average circuit, its internal configuration will not be described in detail here.

Since such a filter device 6 is provided, for example, if you want to change the content of filter link processing such as smoothing or edge enhancement for a certain image, you can change the processing of g1 of the filter device 6 accordingly. Just change it. For example, it is sufficient to change the weight that is equal to mm in the weighted average. Therefore,
In order to change the contents of the filter link process, there is no need to rewrite the contents in the video memo lJi.

FIG. 3 shows a schematic configuration of a more specific embodiment of the rusk scan taraphic display device according to the present invention. In this embodiment, the display screen 4 is horizontally 1024
) in the non-incremental display, from left 2 to lower right, I) + , B2, B3. ,,,,,,, 1)
1o25. ILo2a.

D +o27+ , , , , , , , D2o+:
, B20SO+ B2051 + are scanned in order.

Also, the video memory 1 has one bit per dot and the dots are in the same order as the dots on the display screen 4, that is, B +
+ 82 + 83+ , , , , + B1025I
Bll+261B +027 + ,,,,,,,,,
,, l321149 + B2050 + B20S
Each bit of j+ is read out in order.

The data read from each bit of video memory 1 is 2
The data are sequentially stored in a 050-bit shift register 80.

The signals 3a to 31 are taken out from each part of the video memory [and the shift register 80], are manually inputted to the filter device 6, and are subjected to filter link processing in the filter device 6 in the same manner as explained with reference to FIG. A control signal 7 is output, and the density of the corresponding dot on the display screen 4 is determined using this density control signal 7. This point will be explained in detail by focusing on the determination of the density of the dot D1o26 on the display screen 4.
At the time of display of B1025, shift register 80
In the focus section 8■, the driver) I) on the display screen 4 is read out from the video memory 1.

Data representing the concentration of is stored. Similarly, the bit section 82 stores data read from bit B2 of video memory 1 and representing the density of dot D2 on display screen 4, and the bit section 83 stores data read from bit B3 of video memory 1. Dot D3 on display screen 4
Data representing the density of is stored, and the bit part 8
4) Bro2d.

The second dot D is read out from the display screen 4. 2. The bit section 85 stores data representing the density of the dot B1026 on the display screen 4 read out from the pip) B1026. Data representing the concentration of B1027 read out from bit B1027 and displayed on the display screen 4 is stored, and the bit part 87 stores:
B) Data representing the density of the dot D2049 on the display screen 4 read out from B2049 is stored,
The bit section 88 stores data that is read from the B2050 and represents the density of the D2+IFIO on the display screen 4. In this state of memory,
Next, when data representing the density of the driver (l) 2051 on the display screen 4 is read out from bit B2051 of the video memory 1, this data is manually input to the bit section 88 of the shift register 80 and at the same time ”/ ) B
1026 is inputted to the filter device 6 as a neighboring dot density signal 31. At the same time, the bit portions of the shift register 80 81, 82, 83° 84. 86, 87 . The data stored in 88 and 88 are neighboring dot density signals 3a and 3b, respectively.

3c, 3d, 3r, 3g and 3h to the filter device 6, and also to the bit section 8 of the shift register 80.
The data stored in 5 is the corresponding dot s degree signal 3e.
It is manually inputted to the filter device 6 as a filter. The filter device 6 converts the corresponding I-dot density position 3e into neighboring dot density signals 3a, :lb, 3c.

3d, 3f, 3g, 3h, and 31 are filter-linked to output a density control signal 7 that determines the density of the target image (D126) on the display screen 4.

The filter link parameters of the filter device 6 can be arbitrarily changed by an operator operating the filter link parameter operation section 9 and changing the filter link parameter designation signal 10 to the filter device 6.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and the following various modifications are possible.

(1) The video memory 1 may have two or more hits per dot.

(2) The display screen 4 is not limited to 1024 horizontal dots, but may have any number of dots.

(3) In the above embodiments, the density of dots has been explained, but it is not limited to monochrome, but can be similarly applied to color, and the term "density" in this specification also includes color.

(4) The display unit is not limited to CRT, but can also be displayed on other types of devices such as liquid crystal and commemorative paper.

(5) The target of the filter link by the filter device is:
Not only a direct output signal from the video memory but also a signal converted by using a color lookup table or the like may be used.

(6) The filtering parameter designation signal to the filter device may be changed not only by an operator's operation, but also automatically by a computer or the like.

(7) The neighborhood range of a filter link is not limited to a 3 dot x 3 dot square, but can be arbitrary.

Effects of the Invention As described above, the last screen graphic display device according to the present invention is equipped with a filter device that filters the dot density signal transferred from the video memory to the display section using neighboring dot densities. Filtered images can be displayed very easily without having to be filtered and written to video memory. Furthermore, in the embodiment of the present invention described in connection with FIG. You can keep it at the same value.

Furthermore, the present invention can be easily applied to cases where the original image before filtering has halftones or multiple colors, as long as the video memory has two or more bits per dot. In recent years, the use of a large number of bits per dot and the use of multiple gradations and colors are progressing. Therefore, two areas with similar gradations and colors may be adjacent to each other on the screen, making it difficult to see the boundary between them, which may become a constraint on the number of gradations and colors that can actually be used.

However, according to the present invention, such a problem can be solved by emphasizing only the boundaries and using the original gradation and color inside each area.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram for explaining a conventional example of a rusk scan graphic display device, and Fig. 2 is a small schematic diagram of an embodiment of a rusk scan graphic display device according to the present invention, and its operating principle is explained. Figure 1 is a schematic GI+7 diagram showing a more specific embodiment of the Rusk Scan Graphic Display device according to the present invention. 1. Video memory; 4. ,,,, Display screen. 6, Filter device, ?, Concentration control signal. 80° 14. Shift register, 9. Parameter operation unit for filtering. , io, , , , filtering parameter designation signal, 3e, , , Corresponding dot &'4 plane position numbers, 3a to 3d and 3f to 3i,
, , Neighboring dot density signal Fig. 1

Claims (1)

[Claims] In a rask scan graphic display device of the type that controls the density of dots on the display screen based on the dot density signal value representing the density of each dot on the display screen, the density of the dot corresponding to one dot on the display screen is Upon receiving a corresponding dot density signal representing the density and a neighboring dot density signal corresponding to dots in the vicinity of the one dot on the display screen and representing the density of those neighboring dots, the corresponding dot density signal is converted into the neighboring dot density signal. A rask scan graphic display device comprising a filter device that sequentially outputs a density control signal for each corresponding dot by filtering and determining the density of the one dot on the display screen.