JP2884589B2 - Image output device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image output device used for forming a wipe pattern, for example, and particularly to a high-speed display of a wipe pattern.

[Summary of the Invention]

For example, in an image output device used when forming a wipe pattern, a microcomputer generates horizontal distance data from a reference position of a predetermined pattern by a microcomputer, takes the distance data into a count operation means, Is operated at a predetermined clock to set the horizontal position of the pattern and output the predetermined pattern, so that the pattern generated by the microcomputer can be displayed at high speed.

[Conventional technology]

Erasing the image from the edge of the screen or from the center of the screen so as to hide it on the screen, or projecting the image hidden from the screen from the edge of the screen or from the center of the screen to open the screen The function is called a wipe function.

Traditional SEG (Signal Effect Generator)
Has provided an address wipe pattern generation circuit in order to realize such a wipe function. However, the analog wipe pattern generation circuit cannot display a pattern with a simple shape,
A dedicated circuit is required for each pattern. Further, the analog wipe pattern generation circuit is easily affected by power supply fluctuation, noise, temperature characteristics, and the like.

[Problems to be solved by the invention]

Therefore, it is conceivable to form a wipe pattern using a digital circuit.

By the way, if a wipe pattern is formed by digital signal processing using a high-speed computer, the circuit scale becomes complicated and the cost becomes very high. In particular, such high-speed computers cannot be used in consumer SEGs.

If the digital wipe pattern generation circuit is constituted by hardware, high-speed operation becomes possible, but a dedicated digital wipe pattern generation circuit is required for each pattern, and the hardware becomes large-scale.

Therefore, especially in the case of a consumer SEG, when a wipe pattern is formed using a digital circuit, a microcomputer of about 8 bits is used.

However, the processing speed of such a microcomputer is very slow. Therefore, the pattern obtained by the microcomputer cannot be directly used as the wipe pattern.

For example, when a circle pattern is formed by a microcomputer, the equation of r ² = X ² + Y ² must be solved. Since the machine cycle of the microcomputer is, for example, 0.75 μsec, it takes a very long time to solve this equation and project a circular pattern.

Also, when using the pattern obtained by the microcomputer directly as the wipe pattern,
At least one screen of memory is required.

Accordingly, an object of the present invention is to provide an image output apparatus which has a simple system configuration, can form wipe patterns of various shapes, and does not increase the cost.

[Means for solving the problem]

According to the present invention, a microcomputer generates horizontal distance data from a reference position of a predetermined pattern, fetches the distance data into count operation means, operates the count operation means with a predetermined clock, and outputs the horizontal position of the predetermined pattern. Is set, and a predetermined pattern is output.

[Action]

The microcomputer 1 sets an address thinning interval and a correction coefficient during a vertical blanking period. The horizontal distance data obtained by the microcomputer 1 is set in the counter 17 line by line,
The position of the horizontal edge of the pattern in which the step 17 is advanced by the sampling clock is determined, and the switch circuit 10 is switched accordingly.

〔Example〕

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

First, the principle of an embodiment of the present invention will be described.
In one embodiment of the present invention, the shape of the wipe pattern is stored in a memory for each vertical address as horizontal distance data. When a pattern smaller than the pattern stored in the memory is formed, the address is thinned out and the horizontal distance data stored in the memory is read. When a pattern larger than the pattern stored in the memory is formed, the address is duplicated and the horizontal distance data stored in the memory is read. The read data is multiplied by correction data for correcting horizontal distance data. The corrected distance data is input to the counter. The horizontal position is obtained by the counter, and a switching pulse is generated by the output of the counter.

That is, as shown in FIG. 5, horizontal distance data X _n , X _{n + 1} , X _{n + 2} , of a predetermined size, for example, a circular pattern
X _{n + 3} are obtained for each of the vertical addresses _An , _{An + 1} , _{An + 2} , _{An + 3} . The distance data X _n , X _{n + 1} , X _{n + 2} , X _{n + 3} .
It is stored in the memory as shown in the figure.

In this example, distance data from the vertical center line CL to the left edge of the pattern is stored. Since the circle is symmetric, the distance data from the center line CL to the left edge is
It becomes equal to the distance data from the center line CL to the right edge.

In the case of forming a half circle pattern, for example, of the circle pattern shown in FIG. 5, every other address of the memory data shown in FIG. 6 is thinned out, and every other address A _n , A
Distance data _Xn , _{Xn + 2} , _{Xn + 4} , _{Xn + 6 for n + 2} , _{An + 4} , _{An + 6} ...
.. Are sequentially read. As described above, when data is read by thinning out every other address, the vertical distance becomes 1 /
Becomes 2. When a pattern corresponding to the read data is projected as it is, a pattern as shown in FIG. 7 is obtained. In this pattern, the vertical distance is halved, but the horizontal distance is not halved.

Therefore, in order to correct the horizontal distance, a correction coefficient is applied to the read distance data X _n , X _{n + 2} , X _{n + 4} , X _{n + 6} .
Multiplied by 1/2. That is, in the case of forming, for example, a half circle pattern of the circle pattern shown in FIG. 5, as shown in FIG. This read data X _n , X
_{n + 2} , _{Xn + 4} , _{Xn + 6} ... are multiplied by a correction coefficient 1/2.
In this way, the distance data is read out by thinning out every other address, and this data is multiplied by the correction coefficient 1/2 to obtain the distance data (1/2) _Xn , (1/2) _{Xn + 2} , ( 1/2) X _{n + 4} , (1/2) X
_{n + 6} ... and a pattern corresponding to this data is projected, as shown in FIG. 9, 1 / of the circular pattern shown in FIG.
Two circular patterns can be formed.

When the wipe pattern is formed in this way, since only the address calculation and the multiplication of the correction data are required, almost no processing time is required. And in memory,
Since horizontal distance data in the form of a wipe pattern for each address is stored, the memory only needs to have a capacity capable of storing distance data for the number of horizontal lines.

FIG. 1 shows an embodiment of the present invention. First
In the figure, reference numeral 1 denotes a microcomputer. A configuration based on the functions of the microcomputer 1 can be represented by a data acquisition unit 2, a thinning interval setting unit 3, a coefficient calculation unit 4, an addition unit 5, a multiplication unit 6, and a ROM 7.

Data acquisition unit 2, thinning interval setting unit 3, coefficient calculation unit 4
Operate every vertical period by a vertical pulse VD from the input terminal 13. The adding unit 5 and the multiplying unit 6 are operated every horizontal period by the horizontal pulse HD from the input terminal 14.

ROM7 in is vertical address A _x prepared in example 0-255. Then, in the ROM 7, distance data l _x from the horizontal center line CL of the reference pattern P to the left edge as shown in FIG. 2 is stored for each vertical address A _x . That is, the distance data l _x is stored in the ROM 7 for each vertical address A _x as shown in FIG.

In FIG. 1, reference numerals 8 and 9 are input terminals for video signals. For example, a video signal or a back color signal reproduced from a VTR is supplied to the input terminals 8 and 9. The video signal from the input terminal 8 and the video signal from the input terminal 9 are switched by the switch circuit 10. The output of the switch circuit 10 is output from the output terminal 11.

15 is a size adjustment lever. The size of the wipe pattern is set by the size adjustment lever 15. The size setting value is supplied to the A / D converter 16 and the A / D converter
Size data is output from 16. This size data is supplied to the data acquisition unit 2.

The size data from the data acquisition unit 2 is sent to the thinning interval setting unit 3 and also sent to the coefficient calculation unit 4. The thinning interval setting unit 3 calculates an address thinning interval from the input size data. That is, assuming that the value of the size data is n (corresponding to a pattern of the size of n lines) in the thinning interval setting unit 3, the address thinning interval is obtained by performing the calculation of (255 / n). Can be

That is, the ROM 7 has the vertical addresses from 0 to 255 as described above. When the data in the ROM 7 is used without thinning, the size of the pattern is 255 lines. Therefore, in order to form a pattern having a size corresponding to n lines, the address interval may be reduced to (255 / n).

The coefficient calculation unit 4 calculates a correction coefficient k from the size data. The correction coefficient k is obtained by (k = n × α), where n is the value of the size data. Here, α is a predetermined coefficient for determining the shape of the pattern.

The arithmetic processing for obtaining the address thinning interval corresponding to the size data in the thinning interval setting unit 3 and the arithmetic processing for obtaining the correction coefficient k corresponding to the size data in the coefficient arithmetic unit 4 are performed during the vertical blanking period. Done.

The output of the thinning interval setting unit 3 is sent to the adding unit 5. The output of the addition unit 5 is fed back to the addition unit 5, and the output of the addition unit 5 and the output of the thinning interval setting unit 3 are added. The output of the adder 5 is supplied to the ROM 7. From the ROM 7, the distance data of the address output from the adder 5 is read.

For example, assume that a pattern in which the value n of the size data is (n = 200) is formed as shown in FIG. in this case,
The address thinning interval output from the thinning interval setting unit 3 is 255/200 = 1.275.

Therefore, the output of the adder 5 increases by 1.275, and assuming that the initial value is 0, 0, 1.275, 2.55, 3.825, 5.
1, 6.375, ... When the data of the ROM 7 is read by the output of the adder 5, the portion of the output of the adder 5 below the decimal point is truncated. Therefore, when the value of the size data is (n = 200), the vertical addresses 0, 1, 2,.
The distance data of 3, 5, 6,... Are sequentially read.

The distance data read from the ROM 7 is sent to the multiplier 6. The multiplier 6 is supplied with the correction coefficient k obtained by the coefficient calculator 4. The multiplying unit 6 multiplies the distance data read from the ROM 7 by the correction coefficient k. Thus, the distance data read from the ROM 7 is corrected according to the size data.

The corrected distance data from the multiplier 6 is sent to the counter 17 line by line. The counter 17 is incremented by a sampling clock of, for example, 4 _fsc from the terminal 18. By causing the counter 17 to count down by the distance data corrected from the center line position, the left edge of the pattern in each line is obtained. By causing the counter 17 to count up by the distance data corrected from the center line position, the right edge of the pattern in each line is obtained. The output of the counter 17 is supplied to the switch circuit 10. The switch circuit 10 is switched at the left edge and the right edge of the pattern in each line according to the output of the counter 17.

As described above, in one embodiment of the present invention, the microcomputer 1 sets the address thinning interval and the correction coefficient during the vertical blanking period. The horizontal distance data obtained by the microcomputer 1 is set in the counter 17 for each line, and the counter 17 is incremented by the sampling clock to determine the position of the edge of the pattern. The switch circuit 10 is switched. Therefore, it is possible to project a pattern set for each screen.

For example, it is assumed that a back color video signal is supplied to the input terminal 8 and a reproduced video signal from the VTR is supplied to the input terminal 9. Then, it is assumed that a back color is projected around the pattern, and a video signal from the input terminal 9 is projected inside the pattern.

In each line, the switch circuit 10 is switched to, for example, the a side on the right side of the position counted down by the distance data corrected from the center line position. Therefore, during this time, the back color is projected.

When the count value of the counter 17 reaches a position obtained by counting down the corrected distance data from the center line position, the switch circuit 10 is switched to, for example, the b side. Therefore, a playback screen is displayed.

When the counter 17 reaches the position where the counter 17 is incremented by the corrected distance data from the center line position, the switch circuit 10 is switched to, for example, the side a. For this reason, the back color is projected.

Thereby, the periphery of the set wipe pattern becomes a back color, and a screen based on the video signal from the input terminal 9 is displayed inside the wipe pattern.

In the above embodiment, the microcomputer 1
Is set in the counter 17 to obtain the position of the pattern in the horizontal direction, but an adder may be used instead of the counter.

〔The invention's effect〕

According to the present invention, the horizontal distance data obtained by the microcomputer 1 is set in the counter 17 line by line, and the counter 17 is incremented by the sampling clock to determine the position of the horizontal edge of the pattern. The pattern is determined, and a pattern is output in response.

Find pattern position data with microcomputer computer,
When a pattern is projected using this pattern position data, it takes at least a machine cycle of a microcomputer to obtain individual pattern position data. Therefore, it takes a very long time to obtain the pattern position data in one screen.

On the other hand, according to the present invention, since the position of the pattern is set by setting the distance data in the horizontal direction to the counter 17, the pattern can be projected for each screen.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a schematic diagram used for describing one embodiment of the present invention, and FIG.
FIG. 4 is a schematic diagram used to explain one embodiment of the present invention, FIG. 5 is a schematic diagram used to explain the principle of one embodiment of the present invention, and FIG. FIG. 7 is a schematic diagram used to explain stored data in the explanation of the principle of one embodiment of the present invention, FIG. 7 is a schematic diagram used to explain the principle of one embodiment of the present invention, and FIG. FIG. 9 is a schematic diagram used for explaining the principle of the embodiment of the present invention, and FIG. 9 is a schematic diagram used for explaining the principle of an embodiment of the present invention. Description of main reference numerals in the drawings 1: microcomputer, 17: counter.

Claims (1)

(57) [Claims] A horizontal distance data generating means for sequentially generating horizontal distance data from a reference position of a predetermined pattern for each vertical address; and data based on the horizontal distance data for each vertical address for each line. A counting means set and stepped in accordance with a horizontal drawing position by a predetermined clock, a signal of a background pattern and a signal of a predetermined pattern are supplied, and the signal of the background pattern and the predetermined pattern are supplied by the counting means. Switch means for selectively outputting a signal of the vertical pattern, and when the value of the counting means reaches a value of data based on the distance data for each of the vertical addresses, at a boundary between the background pattern and the predetermined pattern. An image output apparatus characterized in that the switch means is switched.