JPH0831961B2 - Binary hard copy device for color screen - Google Patents

Description

DETAILED DESCRIPTION [Overview] In a conventional method of performing a hard copy by binarizing a luminance signal of a color screen, it is necessary to create a color screen by recognizing which color is hard copied (printed). There is.

According to the present invention, in a screen processing device in which color image data of a plurality of bits is expanded in a corresponding screen memory and displayed in color, a print screen memory having the same configuration as the screen memory is provided, and the color image data is expanded in the screen memory. At this time, if there is image data for which printing is designated, the binarized data of the image data is expanded into dots on the print screen memory, and when the contents of the screen memory are output and displayed, the expanded binarized data is printed. There is provided a binarized hard copy device for a color screen that outputs as.

[Industrial applications]

The present invention relates to an improvement of a binarized hard copy device for a color screen.

When making a hard copy of a color screen with a monochrome printer, the method of slicing the luminance signal of the color screen at a certain level and binarizing it has been conventionally used. Which color is printed and which color is not printed? Need to be known at the time of screen creation, which is complicated, and there is a problem that the degree of freedom in color selection in screen creation is lost.

Therefore, there is a demand for a binarized hard copy device for a color screen that facilitates binarized hard copy.

[Conventional technology]

FIG. 3 is a block diagram of a screen processing device that outputs color screen data to a display unit.

This device uses a screen memory 1 for storing color image data of each dot on the screen as red (R), green (G), and blue (B).
Each of them has 3 sets, and can display 512 colors.

That is, the data of the color screen has 3 bits (b
0, b1, b2) and converted into brightness information and stored in the screen memory address corresponding to the screen.

At the time of display, each 8 bits are read from the screen memory 1, serially converted by the shift registers SR3 to SR5, D / A converted, and output to the display unit together with the synchronizing signal.

The D / A converted analog signal is combined at a predetermined ratio in the print signal generation unit 7 to generate a luminance signal, and is also combined with the synchronization signal and output as a binarized print signal.

This luminance signal is binarized at a certain level by a video printer and printed in black and white, for example.

In FIG. 3, 11 is a screen data creation unit that creates a screen by inputting data from the operation unit 13, and 12 is a color signal that converts each image data into the brightness information (multi-bit color image data) by color specification. A generating unit, a reading unit 10 including an address counter for reading for display, and a switching control unit 9 for switching data input / output and a switching unit 8 for switching addresses by reading / writing are controlled. The read / write control unit controls the read / write of the screen memory 1.

[Problems to be solved by the invention]

As described above, in the conventional method of performing hard copy by binarizing the luminance signal of the color screen, some colors may not be copied. If you want to copy a certain drawing, you can use hard-copyable colors when creating the drawing. Must be specified. For this reason, it is necessary to recognize a color that can be hard-copied, and there is a problem that the degree of freedom in drawing creation is lost.

In view of the above problems, it is an object of the present invention to provide a binarized hard copy device for a color screen that facilitates binarized hard copy.

[Means for solving problems]

For the above-mentioned purpose, the color screen binarized hard copy device of the present invention has a display screen as shown in FIG. 1, which illustrates the principle of the present invention. A color screen in a screen processing apparatus that includes a plurality of corresponding screen memories 1 and converts image data into multi-bit color image data, expands each into the corresponding screen memory 1, and synchronously reads the screen memory 1 to perform color display. Which is a binarized hard copy device, wherein a set of print screen memory 17 is read and written by the same address means as the screen memory 1, and when the color image data is expanded in the screen memory 1, printing is designated. If there is image data, the writing means 23 for dot-developing the binarized data of the image data in the print screen memory 17 and the timing for reading the screen memory 1 are used. , And output means 24 for outputting the contents of the print screen memory 17 as a scanning read printing signal.

[Action]

For example, when a plurality of image data (graphics, etc.) are color-displayed on the same display screen, etc., if you want to make a hard copy of the screen of an image, specify the image name when creating the screen and instruct print output. Alternatively, the printout is instructed by designating the color of the image. As a result, when the image data is converted into color image data composed of a plurality of bits and expanded in the screen memory 1, the binarized data of the image data is expanded in dots in the print screen memory 17. The dot data developed in the print screen memory 17 is output as a print signal in synchronization with the reading of the screen memory 1.

Due to the above, even if you make a hard copy of a part of the screen on which multiple images are drawn, or if you are copying a color screen on which a single image is drawn, a color that can be hard copied when specifying the color when creating the screen. There is no need to be aware of.

For this reason, at the time of screen creation, printing can be designated without being aware of the brightness, and the freedom of screen creation is not lost.

〔Example〕

 An embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a block diagram of the screen processing apparatus of the embodiment,
Reference numeral 15 is a print signal generator, and 16 is a conventional color screen output unit.

The print signal generator 15 includes a print screen memory 17 for storing binary data, a switching unit 18 for switching read / write data, and a D / A 19, D for analog-converting the read binary data into a predetermined level. Synthesizer 20 that synthesizes a sync signal with the / A output
The print screen memory 17 is prepared with a memory capacity for bits corresponding to the dots forming the screen, and the bits corresponding to the same dots as the screen memory 1 are addressed and read / written via the switching unit 8. Controlled.

A screen data creation unit 22 generates dot data (image data, for example, binarized data) for drawing an arc when a center coordinate and a radius are given, for example. And the operation unit
When a print command is input from 13, the gate 21 is opened and the read / write control unit 9 is controlled to store the binarized data of the created image data in the print screen memory 17. This image data is converted into an RGB signal (color image data) based on the designated color by the color signal generator 12 and stored in the screen memory 1.

The same reference numerals as those in FIG. 3 represent the same objects.

 The processing operation will be described below.

(1) Binary data writing When color is designated with the screen data such as bit data and vector data representing a graphic from the operation unit 13, the screen data creation unit 22 creates a corresponding graphic by dots. The dot data is converted into RGB lightness information by the color signal generator 12 and stored in the screen memory 1 at the address specified by the screen data generator 22.

If a print command is input at this time, the screen memory 1
The image data is binarized and stored in the print screen memory 17 having the same address as. When the original data is binary data, the created data is stored as it is.

(2) Print signal output The print screen memory 17 is scanned by the address counter provided in the reading unit 10, and the screen memory 1 and the print screen memory 17 are scanned.
And are read at the same timing.

The binarized data read from the print screen memory 17 is D /
After being D / A converted by A19, the synchronization signals are combined and a print signal as a composite signal is output.

As described above, the print screen memory for storing the binarized data of the designated color screen is provided, and when the print is designated at the time of creating the drawing, the image data is stored and output as the print signal.

Therefore, the specified image can be hard-copied regardless of the color type and the luminance signal.

In the embodiment, the screen processing device that stores RGB lightness information in a plurality of screen memories has been described, but the above-mentioned printing is also performed in the screen processing device that stores data that refers to the color lookup table in the screen memory. A screen memory can be provided and implemented in the same manner.

〔The invention's effect〕

According to the present invention, the screen memory for storing the binarized data of the designated color screen is provided, the binarized data of the image is stored by the print designation, and is read out at the same timing as the color screen. ， The specified image can be hard-copied regardless of the color type, the effect of eliminating the trouble of drawing creation and maintaining the freedom of color selection is extremely large.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a block diagram of a screen processing device according to an embodiment, and FIG. 3 is a block diagram of a conventional screen processing device. In the figure, 1 is a screen memory, 2, 8 are switching units, 3, 4, 5 and 19 are D / As, 7 is a conventional print signal generating unit, 9 is a read / write control unit, 10 is a reading unit, 11 Is a screen data creation unit, 12 is a color signal generation unit, 15 is a print signal generation unit of the present invention, 16 is a color screen output unit, 17 is a print screen memory, 20 is a synthesis unit, 21 is a gate, 22
Is a screen data creation unit.

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Claims (1)

[Claims] 1. A plurality of screen memories corresponding to a display screen are provided, and image data is converted into a plurality of bits of color image data, each dot is expanded in the corresponding screen memory, and the screen memories are synchronously read out to display a color display. A binarizing hard copy device for a color screen in a screen processing device for performing, wherein a set of print screen memories read and written by the same address means as the screen memory and the color image data are expanded in the screen memory. At this time, if there is image data for which printing is designated, the contents of the print screen memory are scanned by writing means for dot-developing the binarized data of the image data in the print screen memory and the timing of reading the screen memory. A binarized hard copy device for a color screen, comprising: an output unit for outputting a read print signal.