JPS584352B2 - Color image display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color image display method suitable for performing a color graphic display for displaying color-added binary information in color television broadcasting.

Various types of color graph ink display systems have already been proposed, and one in which color graphics are written in a display memory and then read out has been put into practical use.

In such a conventional color image display system, the display memory uses three memory surfaces corresponding to the three primary colors of red, green, and blue, for example.

For example, assuming that the memory capacity of each side is 512 bits in the vertical and horizontal directions, a total of 262.144 bits is required.

Since three large-capacity memories are required and a memory drive circuit must be provided for each memory, the conventional device has the disadvantage of being extremely large and expensive.

An object of the present invention is to eliminate the drawbacks of the conventional color image display method described above, significantly reduce the capacity of display memory, reduce the number of drive circuits attached to it, and provide a compact and inexpensive color image display method. It is something to do.

The present invention, when reading binary information stored in a display memory and displaying a color image on a display screen using the rask scan method, converts the bit pattern generated in the direction of scanning line progress into at least one bit. Start bit followed by m bits of color code (m=1, 2...
) and n bits (n = 0, 1, 2...) from this color code m bin to the end of the pattern, and when displaying, m bits of color from each bin pattern are displayed. This method is characterized by extracting a code and displaying a continuous pattern from the start to the end of the pattern using one of 2m colors represented by the extracted m-bit color code.

A color code indicating the color of this pattern is inserted at the beginning of each pattern.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the overall structure of a color image display system according to the present invention.

A character signal generator 1 is provided for generating digital character signals, which character signal generator 1 can be of various conventional types, such as a flying spot scanner, a magnetic disk drive, a human output typewriter, a paper tape reader, etc. etc.

For example, when the character signal generator 1 is a frang spot scanner, it scans a transparent or opaque dial plate 2 and generates a character signal as shown in FIG. 2A.

In the present invention, the dial plate 2 does not necessarily have to be a single color character, but can be a black and white character, and even if it is a color character, the color in which the character is displayed is as will be clear from what will be described later. Can be specified arbitrarily.

In response to each scan by the François scanner, a digital character signal corresponding to the character pattern drawn on the dial plate 2 is obtained as shown in FIG. 2A.

This digital character signal is supplied to a color code adder 3. A color specifying circuit 4 is connected to the color code adder 3 to supply a color specifying code.

The color code designated by this color designation signal is added to the character number.

The color code is added next to at least one pattern start bit in the direction of scanning line progression.

FIG. 2B shows the output of the color code adder 3 when the pattern start bit is 1 bit and the color code is 3 bits (001).

As is clear from FIG. 2B, if the pattern is interrupted even in the same scanning line, a color code is added again.

FIG. 2C shows the general format of the color coded bit pattern.

Pattern start bit S of t bits at the start position of the pattern
1, S2...87 (4=1,2...)
followed by m-bit color code bits C, ,
C2...Cm (m=1, 2...) are arranged, and after this color code pit, n-bit pattern bits P1, P2... until the end of the continuous pattern are arranged.
- Arrange Pn (n=O, 1, 2...).

As described above, a character pattern signal with a designated color code is supplied to the display memory 5,
It is stored at a predetermined location designated by the in-memory location designation circuit 6.

This display memory 5 is, for example, 512 in height x 10 in width.
24=524,288 bits.

In this way, predetermined character information to which a predetermined color code is added is sequentially stored in the ice play memory 5 at predetermined positions.

Next, this display memory 5 is scanned according to the rask scan method to read out the stored character information.

By this scanning, the same signal as the character string shown in FIG. 2B is read out.

The -scanning signal is shown enlarged in FIG. 2d.

This character signal is supplied to the color code character signal separator 7, and a continuous pattern signal P which does not represent all periods of pattern 1 start bit, color code bit and pattern focus is supplied.
(Fig. 2 E) and color code bits C1, C2...
. . . Cm (FIG. 2 F) are generated, respectively.

The color code pit is supplied to a color signal generator 8, which decodes the color code to generate a signal for a predetermined color, and supplies this color signal C to a color adder 9.

The color adder 9 is also supplied with the character signal P from the color code/character signal separator 7, and a predetermined color signal is added to the character signal P to form a color character, which is then supplied to the output terminal 10.

In this manner, a character signal to which a predetermined color signal is added is obtained at the output terminal 10.

In the method of the present invention described above, the length of the shortest pattern is equal to the sum of the pattern start bit and the color code bit.For example, if the start bit is 1 bit and the color code bit is 3 bits, the length of the shortest pattern is equal to the sum of the pattern start bit and the color code bit. The length is 4 bits.

FIG. 3 shows the configuration of an example of a color code/character signal separator in which the pattern start bit is 1 bit and the color code pit is 3 bits.

Display register 5 to 16 register 2
Read 16 bits at a time to 0 in parallel.

Four bits are transferred from this 16-bit shift register 20 to a 4-bit shift register 21 at a time.

The first 4 bits of the continuous pattern are a 1-bit pattern start bit S1, a 3-bit color code bit C1,
Since it is composed of C2 and C3, these are transferred to the bit shift register 21.

An output S1 of logic "1" is supplied from the output terminal S of the start hit accumulation position of the 4-bit shift register 21.

This output S is supplied to the control circuit 22.

The control circuit 22 receives this output S1, supplies a control signal to the 4-bit buffer register 23, and transfers the contents of the 4-bit shift register 21 to the 4-bit buffer register 23 in parallel.

Therefore, the start bit S1 and the password code bits C1, c2, and c3 are stored in the 4-bit eight-digit sofa register 23.

Next, new 4-bit information, that is, pattern bit P
,, P2, P3, P4 are 16-bit shift register 20
The data is transferred from the 4-bit shift register 21 to the 4-bit shift register 21.

At this time, all outputs of the 4-bit shift register 21 become logic "1" and the control circuit 22 does not reset the 4-bit buffer register 23, so the contents of the 4-bit buffer register 23 remain unchanged. maintained.

Therefore, while the pattern bits are arriving in the 4-bit shift register 21, the contents of the 4-bit buffer register 23 are not changed but are kept in the same state.

Therefore, the first output terminal 23-■ of the 4-bit bumper register 23 outputs the logic "
1" is supplied, and the remaining output terminals 23-n to 2
A color code representing the color to be added to this pattern continues to be supplied from 1-■.

When the pattern bit ends, the 4-bit shift register 2
A logic "0" is supplied from the output terminal S of the 4-bit buffer register 2, and the control circuit 22 receives this signal.
3 and clear its contents.

The color code bits from the 4-bit buffer register 23 are supplied to the decoder 24 to generate a specified color signal, buffered by 4 bits, and sent to the first output terminal 2 of the register 23.
3-I together with the pattern signal P.
The color adder 25 generates a pattern signal to which a predetermined color signal is added.

As described above, according to the present invention, a color code representing the color to display the image is added to the bit pattern of the image to be displayed, so the capacity of the display memory can be significantly reduced. Therefore, the number of driving paths can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an apparatus for implementing the color image display method according to the present invention, FIGS. 2A to 2F are waveform diagrams for explaining its operation, and FIG. 3 is a color code FIG. 2 is a block diagram showing the configuration of an example of a character signal separator. 1...Character code generator, 2...Dial board, 3...Color code Aku, 4...
Color specification circuit, 5...Display memory, 7.
...Color code - text signal separator, 8...
...Color signal generator, 9...Color adder.

Claims (1)

[Claims] 1. When reading the binary information stored in the display memory and displaying the color-added binary image on the display screen using the Rusk scan method, the bit pattern generated in the direction of scanning line is divided into at least one bit. Start bit followed by m bits of color code (m=1, 2...
. A color image display method characterized in that a continuous pattern from the start to the end of the pattern is displayed in one color out of 2m colors represented by the extracted m-bit color code.