JPS59119491A - Control system of hard copy - Google Patents

Abstract

PURPOSE:To eliminate the thick straight line when a diagram is plotted with straight line by using a frame buffer memory exclusive for hard copy device to store only the information needed for the hard copy. CONSTITUTION:When a line is smoothed, the writing address delivered to a line 12 is coupled with the preceding address. This address is decided by the smoothing process of a vector generator 2. In this case, no writing pulse is applied to a frame buffer memory 11 for hard copy from the generator 2 via a line 17 and the original display position of the straight line is not shown. Therefore no data is written, and only the information needed for hard copy is held by the memory 11. This information is read out for hard copy. In such a way, a copy output which does not thicken the straight lines is obtained when a diagram is plotted by a hard copy device with the straight line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bar P in a C'kLT display device.
This paper relates to improvements in copy control methods.

[Technical background of the invention]

A color graphic display device using the Rusk scan method has the advantage of being able to easily display a wide variety of colors. However, for example, in the case of an inclined straight line displayed on a CRT monitor, step-like jaggedness may appear, resulting in poor radiation quality. To improve this point, line smoothing is generally performed.

That is, instead of one pixel (hereinafter referred to as a pixel) as the minimum unit of an image, two neighboring pixels are used, and by performing brightness modulation according to the area of intersection with a straight line, two pixels can be The sum of the luminances of each pixel is held to a constant value, and is set so as not to exceed the luminance value of one normal pixel. Therefore, smooth line quality is achieved without increasing the line width, making the staircase effect more noticeable.

Problems with the Background Art] When the line smoothing described above is performed, the jaggedness is reduced on both sides of the CRT and the +i and C lines appear clean, but one point on a straight line is displayed as two pixels.

Therefore, if this information is used in the hard copy, the jaggedness will be worse and the straight lines will be thicker than when line smoothing is not performed.

[Purpose of the invention]

It is an object of the present invention to provide a bar r that does not make the lines thicker even when the information subjected to line smoothing processing is used in a hard copy.
Provides one method for copying.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention adds a frame buffer memory dedicated to the copying device to store only the information necessary as a hard copy. Then, perhaps by not storing bit information to which line smoothing processing is applied to this frame buffer memory, winter thickening was prevented.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (1) is a CPU such as a microprocessor (2) is a vector generator, (3) is a timing generator, (4) is a display color register (4), (5), (6),
The display information corresponding to each color of GB is described in 1. is the frame buffer memory. (8) and (9) are frame buffer memories used to apply line smoothing for straight line display, and the brightness level of each pixel is set to 2=4.
It can be set as follows. (10) is an OR gate, (11) is a frame buffer memory for to-P copy, (12) is an fd address line, (13) is a write node ξ line, (1
4).

(15) is the brightness modulation data line, (16), (1
7) is the hardcopy device data line and write;
This is the e-Russ line.

Bar P copy control during line smoothing processing in an RGB color CRT display device will be described below.

Generally, RGB color CRT display device i'
i has three frame buffer memories (5), (6), and (7) to hold R, G, and B color data. Therefore, 23=8) color displays can be performed at the same time. Furthermore, in the display of TIi lines, in order to perform line smoothing processing, 22 = 4 brightness levels are set for each pixel using the frame buffer memory for LSI (8) and frame buffer memory for JS2. It is set.

The operation when displaying a straight line is as follows: First, the coordinates of a point on the straight helix generated by the vector generator (2) are set to the address line (
12) as the write address (x, y) to all bits of the frame buffers (5) to (9) and (11).

Next, the old NoriRes generated from the vector generator (2) is sent to each frame memo 'J (5) via the line (13).
) to (9), the display information of the display color register (4) is written into each of the RGB frame buffer memories (5) to (7). At this time, LSL
A vector generator (8) for frame buffer memory (8) and a frame buffer memory (9) for
2) The luminance level calculated and set for performing the line smoothing process output to (7(14) and (15)), that is, the luminance modulation data, is written.

Follow the steps above to create a frame/tsufamemo! J(5L(
Display information is stored in 6) and (7), and when it is a straight line, the frame buffer memory for line smoothing (8) is stored.
), the brightness modulation data is stored in (9), but at this time, the mood copy frame buffer memo'J (11)
0 to the XY address indicated on the address line (12) of
R game) The information output from (10) is line (17
) is written in response to a write pulse. That is, in an RGB color display device, the OR gate (10) converts at least one of the R and OB output data of the display color register (4) in order to convert color 11" information into monochromatic information. When is logic “1”, logic w II
1' PI signal is output to the frame buffer memory (11).

Next, in order to perform line smoothing processing, RGB
RGB display information from the frame buffer memory (5) to 2 stars (4) is written to the display color, and the line smoothing frame buffer memory (8), (9
), the brightness level (sometimes different from the previous level) output by the vector generator (2) is output to lines (14) and (15). At this time, line (12
The write address (x, y) output to ) is an address that forms a pair with the previous address, and this is determined by the smoothing process of the vector generator (2).

The line (17) from the vector generator (2) is in the 7-ram memory (11) for eight-dimensional copying.
Since a write pulse is not applied through the 1α line and does not indicate the original display position of the 1α line, no data is written. Therefore, the bird copy frame buffer (11
) holds only the information necessary for the hard copy, and its 'l'i? '4') Must be read when J makes a hard copy.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the display information to be output for line smoothing is not stored in the hard copy frame buffer memory, but only the ti7 information to be taken as a hard copy is stored. Therefore,
Bird copy equipment f) 12 F for drawing straight lines etc. in &C
A copy output can be obtained without making the straight line thicker.

[Brief explanation of drawings]

The figure shows a block N showing an embodiment of the present invention. 1... CPU, 2... Vector generator, 3... Timing generator, 4... Display color register, 5, 6, 7
... Frame sofa memory compatible with RGB, 8
．． 9... Frame pack memory for line smoothing, 10... OR gate, 11... Frame buffer memory for hard copy Agent Patent attorney Noriyuki Chika (and 1 other person)

Claims (1)

[Claims] In a CRT display device having a line smoothing function, a frame buffer memory dedicated to the hard copy device for storing data other than bit information to which the line smoothing function is applied is provided, and the data held in the frame buffer memory is transferred to the hard copy device. Hard copy system L141 characterized by reading and outputting for
method.