JPH0787518A - Television key signal adjustment device - Google Patents

Abstract

PURPOSE:To make a picture boundary part natural by adjusting the phase of a television key signal to a picture element unit or less by first and second delay/interpolation means and selecting it by a second means to adjust the width of the key signal. CONSTITUTION:When a key signal (a) is inputted from an input terminal 100, it is delayed by a delay circuit 11 of a first delay/interpolation means 1, and a delay key signal (b) is inputted to an interpolation circuit 12 together with the signal (a). When the addition result between key signals (a) and (b) is multiplied by 1/2. a key signal (c) is outputted to an addition circuit 4 and a selecting circuit 62. Meanwhile, the key signal (b) obtained by delaying the key signal (a) by a delay circuit 2 is outputted to a second delay/interpolation means 3 and a selecting circuit 5; and when a key signal (d) from the circuit 2 is inputted to a delay circuit 31 of the means 3, a delay key signal (e) is inputted to an interpolation circuit 32 together with the key signal (d). Key signals (d) and (e) inputted to the interpolation circuit 32 are added and are multiplied by 1/2 in the circuit 32, and a key signal (f) is outputted to the circuit 4 as the result, and it is selected as a key signal (g) by the circuit 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television key signal adjusting device capable of adjusting the phase and width of a television key signal.

[0002]

2. Description of the Related Art A technique for synthesizing a television screen by inserting a part of one television screen into another screen is often used in television image production. Conventionally, such a technique is based on chroma key. When screen synthesis is performed by this chroma key technology, a chroma key signal (television key signal or simply key signal) having a blue background as a main component is generated, and as shown in FIG. 5, this key signal is moved in the level direction. Waveform shaping while adjusting appropriately. This makes the state of the boundary between the inserted screen and the inserted screen more natural when the screens are combined. As a technique similar to this, Japanese Patent Publication No. 60-1
There is a technique described in Japanese Patent No. 1874.

[0003]

However, in the above-mentioned conventional technique, as shown in FIG. 5, since the waveform shaping of the key signal can be performed only in the level direction of the key signal, the chroma key is used. In the composition, there is a problem that a fogging of the blue background or a leakage of the blue background occurs at the boundary between the inserted screen and the inserted screen, and the boundary becomes unnatural.

The present invention has been made in view of the above-mentioned problems. A television key signal that allows the phase and width of the television key signal to be adjusted so that the boundary portion in screen synthesis can appear more naturally. It is an object to provide an adjusting device.

[0005]

In order to achieve the above object, a television key signal adjusting apparatus of the present invention comprises a first delay / interpolation for adjusting the phase of an input television key signal to a pixel unit or less. Means, delay means for delaying the television key signal, second delay / interpolation means for adjusting the phase of the output signal from the delay means to a pixel unit or less, and the first and second delay / Adder means for adding output signals from the interpolating means, first selecting means for selecting one of the output signal from the adding means or the output signal from the delay means, and the output from the first selecting means A second selection means for selecting one of the signal and the output signal from the first delay / interpolation means to adjust the width of the television key signal is provided.

According to a second aspect of the present invention, there is provided a television key signal adjusting device according to the first aspect, wherein the first delay / interpolation means delays the input television key signal, and The output signal from the delay circuit and the television key signal are added and multiplied to form an interpolation circuit that adjusts the phase of the television key signal to a pixel unit or less. Means for delaying the output signal from the delay means, and the output signal from the delay circuit and the output signal from the delay means are added and multiplied to determine the phase of the television key signal in pixel units. And a second selecting means for performing level comparison between the output signal from the first delay / interpolating means and the output signal from the first selecting means. , Big Of the output signals from the first delay / interpolation means or the comparison circuit that outputs a selection signal for selecting a low level signal or a low level signal, and the selection signal from the comparison circuit. And a selection circuit for selecting and outputting one of the output signals from one selection means.

Further, in the television key signal adjusting device according to claim 3, in the television key signal adjusting device according to claim 1 or 2, there is a delay between the first delay / interpolation means and the second selection means. A circuit is provided to allow the first selecting means to compare the level of the output signal from the delay means with the level of the output signal from the adding stage to select a large level signal or a small level signal. Is provided, and the first selection means selects one of the output signal from the delay means and the output signal from the addition means based on the selection signal from the comparison circuit. Then, it is configured to output.

[0008]

According to the television key signal adjusting device,
The phase of the television key signal is adjusted to a pixel unit or less by the first delay / interpolation means, and the phase of the output signal from the delay means is adjusted to a pixel unit or less by the second delay / interpolation means. Adjusted to. Then, the output signals from the first and second delay / interpolation means are added by the addition means, and one of the output signal and the output signal from the delay means is given by the first selection means. To be selected. Next, one of the output signal from the first selecting means or the output signal from the first delaying / interpolating means is selected by the second selecting means, and the width of the television key signal is adjusted. .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a television key signal adjusting apparatus according to a first embodiment of the present invention. As shown in the drawing, the television key signal adjusting apparatus according to the present embodiment has a first delay / interpolation means 1, a delay circuit 2 as a delay means, a second delay / interpolation means 3, and an addition. Adder circuit 4 as means and selection circuit 5 as first selection means
And a second selection means 6.

The first delay / interpolation means 1 is an input terminal 1 for inputting a television key signal (hereinafter "key signal") a.
00 and a delay circuit 11 connected to the output terminal of the delay circuit 11 and the input terminal 100. The delay circuit 11 delays the input key signal a in time and outputs the key signal b. Further, the interpolation circuit 12 has a function of inputting the key signal b from the delay circuit 11 and the key signal a from the input terminal 100, adding these signals a and b, and performing a multiplication of ½. is doing. That is, the interpolation circuit 12 adjusts the phase or width of the key signal a, for example, if the pixel unit is 1, the key signal a is in units of 1/2, 1/4, or the like.
Can be adjusted. Therefore, the interpolation circuit 1
From 2, the key signal c (= (a + b) as shown in FIG.
/ 2) is output.

The delay circuit 2 delays the key signal a from the input terminal 100 in time and outputs the key signal d to the selection circuit 5. The second delay / interpolation means 3 is
It is formed of a delay circuit 31 connected to the output side of the delay circuit 2 and an interpolation circuit 32 connected to the output side of the delay circuit 31 and the output side of the delay circuit 2. The delay circuit 31 is
The key signal d from the delay circuit 2 is input and delayed, and the key signal e is output to the interpolation circuit 32. The interpolation circuit 32 has the same function as the interpolation circuit 12,
The key signal e from the delay circuit 31 and the key signal d from the delay circuit 2 are input, these signals d and e are added, and 1 /
It has the function of multiplying by two. The key signal f (= (d + e) / 2) output from the interpolation circuit 32 is output to the addition circuit 4.

The adder circuit 4 is a circuit for outputting a signal of the same level as the key signal d from the delay circuit 2,
It has a function of adding the key signal c from the interpolation circuit 12 and the key signal f from the interpolation circuit 32 and outputting the result to the selection circuit 5. The selection circuit 5 is a circuit for selecting the phase or the width of the key signal adjustment. That is, the key signal d from the delay circuit 2 and the key signal from the adder circuit 4 are input and one of the signals is output as the key signal g. Specifically, by selecting the key signal d,
The width of the key signal is adjusted, and the phase of the key signal is adjusted by selecting the key signal f.

The second selection means 6 is composed of a comparison circuit 61 and a selection circuit 62 which are connected to the output side of the interpolation circuit 12 and the output side of the selection circuit 5. The comparison circuit 61 has a function of outputting an output signal h to the selection circuit 62 for selecting whether the selection circuit 62 has a higher level or a lower level. Specifically, the comparison circuit 61 outputs the selection signal h under the control of the input control signal C1. The selection circuit 62 uses the selection signal h from the comparison circuit 61.
Based on the above, it has a function of selecting either the key signal c or the key signal g input to the selection circuit 62.
That is, when the selection signal h is a signal instructing to select a signal of a large level, the signal of the larger level of the input key signals c and g is output to the output terminal 101 as the key signal k. To do.

Next, the operation of this embodiment will be described.
When the key signal a is input from the input terminal 100, it is delayed by the delay circuit 11 of the first delay / interpolation means 1, and the key signal b is input to the interpolation circuit 12 together with the key signal a. When these key signals a and b are input to the interpolation circuit, these key signals a and b are added and multiplied by 1/2, and the key signal c shown in FIG. To the selection circuit 62.

On the other hand, the key signal a input to the delay circuit 2
Is delayed by the delay circuit 2 and the key signal b is output to the second delay / interpolation means 3 and the selection circuit 5. When the key signal d from the delay circuit 2 is input to the delay circuit 31 of the second delay / interpolation means 3, it is delayed by the delay circuit 31 and this key signal e is input to the interpolation circuit d together with the key signal d. To be done. Key signals d and e input to the interpolation circuit 32
Is subjected to addition and 1/2 multiplication by the interpolation circuit 32, and is output to the addition circuit 4 as a key signal f indicating the addition. When the key signal f and the key signal c from the interpolation circuit 12 are input to the adder circuit 4, they are added and the selection circuit 5 is added.
Is output to. The selection circuit 5 selects the signal from the adder circuit 4 or the key signal d from the delay circuit 2 depending on whether the adjustment of the key signal is phase or width, and selects the key signal g shown in FIG. Comparing circuit 61 and selecting circuit 6 of the second selecting means 6
2 and output.

In the comparison circuit 61, when the control signal C1 instructing whether the level is higher or lower is input, the selection signal h instructing the selection is output from the comparison circuit 61 to the selection circuit k, and the selection circuit k. One of the key signals c and g input by 62 is selected and output to the output terminal 101 as a key signal k. Specifically, when the selection signal h input to the selection circuit 62 is a signal for instructing to select the one with a higher level, the selection circuit 62 changes the state as shown in (c) or (d) of FIG. As shown, the signal with the larger level is selected in time series.

That is, during the time from t1 to t2, the key signal having the higher level of the key signals c and g input to the selection circuit 62 is the key signal c, so the selection circuit 6
2 outputs the key signal c. And from t2 to t3
Since the key signals c and g are both at a high level during the time of, either of the key signals c and g is selected. Also,
During the period from t3 to t4, the key signal g has a higher level among the input key signals c and g, and thus the key signal g is selected. Therefore, from the selection circuit 62,
As shown in (c) of FIG. 3, the key signal k having a wide width is output from the output terminal 101.

On the contrary, when the selection signal h is a signal for instructing to select the one with a smaller level, the selection circuit 6
In 2, the smaller one of the key signals c and g is selected and output in each time zone. As a result, (d) of FIG.
As shown in FIG.
Is output to the output terminal 101.

As described above, according to this embodiment, the interpolation circuit 1
Since the phase and width of the key signal a can be adjusted by 1, 32 and the selection circuits 5, 62, the combined boundary portion looks more natural in screen combination such as chroma key.

Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram showing a television key signal adjusting apparatus according to the second embodiment. In the present embodiment, the delay circuit 8 is provided between the interpolation circuit 12 and the second selecting means 6, and the comparison circuit 7 for controlling the selecting circuit 5 is further provided. Different from the embodiment.

That is, the control signal C is supplied to the comparison circuit 7.
2 is input and the width of the key signal g output to the selection circuit 5 is controlled similarly to the second selection means 6. Specifically, when a control signal C2 for selecting whether the level is high or low is input to the comparison circuit 7, whether the level is high or low with respect to the selection circuit 5 from the comparison circuit 7. A selection signal l for instructing to select is input. Therefore, as the key signal g output from the selection circuit 5, the width-adjusted key signal g as shown in (c) or (d) of FIG. 3 is output.

That is, the width of the key signal k output from the selection circuit 62 can be freely widened or narrowed by further finely adjusting the width by the comparison circuit 7 before the second selection means 6. it can. Other configurations, functions and effects are similar to those of the first embodiment described above, and the description thereof is omitted.

[0023]

As described above, according to the television key signal adjusting apparatus of the present invention, the phase of the television key signal can be adjusted by the first delay / interpolation means and the second delay / interpolation means. Since the width is adjusted to the unit or less and selected by the second selecting means to adjust the width of the television key signal, the boundary portion in the screen synthesis can be more naturally expressed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a television key signal adjusting apparatus according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram showing an output signal from an interpolation circuit.

FIG. 3 is a waveform diagram showing an output signal, FIG. 3 (a) shows a waveform of an output signal from an interpolation circuit, FIG. 3 (b) shows a waveform of an output signal from a selection circuit, 3C shows the waveform of the output signal from the selection circuit adjusted to be wide, and FIG. 3D shows the waveform of the output signal from the selection circuit adjusted to be narrow.

FIG. 4 is a block diagram showing a television key signal adjusting device according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of waveform shaping in a conventional example.

[Explanation of symbols]

 1 1st delay / interpolation means 2,11,31 delay circuit 3 2nd delay / interpolation means 4 addition circuit 5,62 selection circuit 12,32 interpolation circuit 61 comparison circuit a,-, k key signal

Claims (3)

[Claims] 1. A first delay / interpolation means for adjusting the phase of an input television key signal to a pixel unit or less, a delay means for delaying the television key signal, and an output signal from this delay means. Second delay / interpolation means for adjusting the phase of the signal to less than a pixel unit, addition means for adding the output signals from the first and second delay / interpolation means, and the output signal from the addition means or A first selection means for selecting one of the output signals from the delay means, and one of the output signal from the first selection means or the output signal from the first delay / interpolation means to select the television. A television key signal adjusting device comprising: a second selecting means for adjusting the width of the John key signal. 2. A delay circuit for delaying an input television key signal by the first delay / interpolation means, and addition and multiplication of an output signal from the delay circuit and the television key signal. A delay circuit for delaying the output signal from the delay means, the delay circuit being formed by an interpolation circuit for adjusting the phase of the television key signal to a pixel unit or less. And an output signal from the delay means are added and multiplied to adjust the phase of the television key signal to a pixel unit or less. A level comparison between the output signal from the first delay / interpolation means and the output signal from the first selection means is performed, and a selection signal for selecting a high level signal or a low level signal is output. With comparison circuit And a selection circuit that selects and outputs one of the output signal from the first delay / interpolation means or the output signal from the first selection means based on the selection signal from the comparison circuit. The television key signal adjusting device according to claim 1. 3. A delay circuit is provided between the first delay / interpolation means and the second selection means, and the output signal from the delay means and the addition are added to the first selection means. A comparison circuit is provided for performing a level comparison with the output signal from the stage and outputting a selection signal for selecting a high level signal or a low level signal. The television key signal adjusting apparatus according to claim 1 or 2, wherein one of the output signal from the delay means and the output signal from the addition means is selected and output based on the selection signal.