JPS59202493A - Raster scan type graphic display system - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for compressing and restoring drawing data in a rask scanning graphic display system, and more particularly to a method and apparatus for restoring compressed drawing data.

Conventionally, in rask scanning graphics display devices, input vector data was converted to raster data and then output to the display device, so the data for the entire graphics had to be held internally in vector or raster format. However, when displaying a large drawing, it is necessary to have a huge buffer capacity, and the raster generator also processes information at the original size, which slows down the processing speed.

The present invention solves the problem of buffer capacity and processing speed, and corrects the deformation of the output drawing that occurs as a result.

That is, the present invention reduces the internal capacity of the conventional rask scanning type figure display device, improves the processing speed, and provides smooth output figures by changing the correction contents depending on the purpose of use. I can do it.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a device according to the present invention, in which 10 is a vector data input device, 11 is an input data compression device, 12 is a rask generator, 16 is a scan buffer, and 14 is a decompression device. , 15 is a scanning data output device, 1
6 is a register used for compression and restoration, 17 is a scale specification device during restoration, and includes a raster generator N12 and a scan buffer 1.
3 converts vector data into raster data.

In the above configuration, a case will be described in which line segment data compression and raster data restoration according to the present invention are operated at a compression ratio of 3. The line segment data input by 10 (line segment data input device) shown in Fig. 1 is transferred to 11 (compression device), and the line segment data is compressed according to the compression ratio specified by 16 (compression ratio register). 12゛(raster generator)
and 13 (run, 7 buffers) to convert the compressed line segment data into raster data. The reduced and converted sister data is input to 14 (restoring device), which restores the raster data according to the compression ratio of 16 (compression ratio register) and the specification of 17 (shading specification), and converts it to 15 (scanning) as restored raster data. The data is output to a data output device and created as a drawing. When the line segment data is compressed and converted to raster data and restored raster data is created, it is restored at the same ratio as the compressed data and the drawing data is corrected.

FIG. 2 is a detailed diagram of the restoring device section. In order to reversely correct one anchor point by the compression ratio specified in the compression register, the restoration device inputs the drawing point information of eight surrounding points around the drawing point, and calculates the positional relationship between the drawing point and the surrounding points, Pixel correction for drawing points by correction pattern and density specification (this time, 1
(The drawing point corresponds to 9 pixels) and outputs it as restored raster data.

FIG. 6 shows an example of raster data processed according to the present invention. 30 (drawing point information) in this figure indicates 3×3 drawing points on the scanning buffer inputted from the margin data. 30(
In the drawing point information), 54 (hatched area) indicates that the drawing point is on, that is, the drawing state is on, and 35 (blank area) indicates that the drawing point is off, that is, the drawing state is not drawn. 31 (simple restoration).

32 (darkness restoration) and 133 (lightness restoration) indicate the restored screen created from 30 (drawing point information) with respective shading specifications, and 31 (simple restoration) indicates that the shading specification is not specified. It is restored from the drawing point information using a restoration rate corresponding to the compression ratio. 36 (black circle) indicates a pixel point to be printed, and 37 (white circle) indicates a pixel point not to be printed. 32 (Dark Restoration) is an example of a restoration rask from anchor point information when the density designation is a plus designation, and 38 (
Filled circles and white spaces) indicate pixel points added to 61 (simple restoration). 36 (light restoration) is an example of a restoration rask based on anchor point information when the shading specification is set to a negative value, and 39 (black circle within a white circle) indicates a pixel point that has been deleted for 31 (simple restoration). be. The user can select the D light designation setting depending on the purpose of use.

FIG. 4 is an example of raster data processed according to the present invention in the same way as FIG. 3, and 40 (drawing point information) shows interference between a drawing point and surrounding drawing points during correction during restoration. 41 (Darkness restoration) is an example of a restored screen when the shading specification is set as plus from 40 (Drawing point information), and 42 (
40 (Drawing point information) is an example of a restored screen when the shading designation is set to a minus designation.

Examples of correction patterns of the restoration device are shown in FIGS. 5 and 6. Table 50 shows the correction pattern in the anchor line element ON state at four points around the anchor line element ON (hatched area) in 51 (anchor point information). A correction pattern is extruded from the relationship between the central anchor cable element and the surrounding anchor cable elements, and the logical OR of the anchor cable elements is taken to obtain restored sister information.

FIG. 6 shows an example of a correction pattern in the same way as FIG. 5, but the correction patterns differ depending on the environment of the anchorage elements.

FIG. 7 shows restored raster data obtained by correcting the anchor line elements input to the restoring device using a correction pattern. Six lines of drawing elements are read into 71, 72, and 73 (drawing element buffers) shown in the same figure, and a correction pattern is extracted based on the state of surrounding drawing elements around one drawing element to create a restored screen. To go. Figure 7 is an example when 9-light designation is positive designation, and the anchor line element buffer 72 is the center.By moving the center point, a restoring flow raster for one line drawing element is created. can. By selecting on/off states for the central anchor cable element depending on the type of shading designation (plus, minus, no designation) and creating a restoring flow raster, shading can be designated using the same device and method.

Therefore, compared to conventional raster scanning graphics display devices and display systems, the internal capacity for raster conversion of compressed line segment data is reduced and the processing speed is improved. Also, by restoring the compressed data after conversion and creating a drawing similar to the one before being applied to this device and method, by specifying shading at the time of restoration, smooth figures can be obtained at high speed according to the purpose of use.

As described above, according to the present invention, it is possible to reduce the internal capacity, improve the processing speed, and select output figures depending on the purpose of use in rask scanning type graphic display.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a 2-meta-scanning graphic display device according to the present invention, FIG. 2 is an explanatory diagram of a restoring device section of a rask scanning graphic display device according to the present invention, and FIG. 3 (α)tCb) I CC)l Cd) is a restored view of the drawing element processed according to the present invention, FIG. 4C(L
), Cb), CC) are interference reconstruction diagrams of the drawing elements processed according to the present invention, FIG. 5(a), Cb) are correction pattern diagrams by the drawing elements, FIG. 6(α), Cb), CC) is a correction pattern diagram using drawing elements, and FIG. 7 (α) + (b) + (') is a diagram of drawing element restoration using a drawing element buffer. 10... Line segment data input device 11... Compression device 12... Raster generator 14... Restoration device 15... Scan register addition 1 Figure 7 /j Figure 2 Figure 3 (C) 3rd
Figure (d Figure 4 (0,) Figure 4 (b)
Figure 4 (C) Funeral S figure (a) Figure 511211 (b) Figure β (a) Ya6 (2I (b') Figure 6 (0)

Claims (1)

[Claims] The input line segment data is arbitrarily reduced and internal processing treats it as a reduced line segment, and when outputting it, the raster data is restored by the reduced coefficient and plotted, and when restoring the reduced raster data, , a rask scanning figure display method that is characterized by creating a correction pattern from one drawing element and its surrounding drawing elements and arbitrarily restoring a figure that suits the purpose of use.