JPH0516714B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a special effect generating device, and particularly to a special effect generating device that superimposes characters on the screen (hereinafter referred to as title super) when producing television programs.
It is suitable for application in various cases.

[Background technology and its problems]

Title superimposition is used as a supplementary means to express the content of the screen, but when characters are superimposed on a background image, a method of bordering the characters has traditionally been used to distinguish the characters from the background image and make them easier to see. There is.

That is, firstly, as shown in Figure 2 A1, the letter A
The title signal TS (second
The so-called normal super system using colored characters according to Figure A2) is used as a principle system. Then, as a method of adding a border to the edges, as shown in Figure 2 B1,
A so-called border super method is used in which the edges of the TT are sloped to blur the image of the background image, and a blurred part BB is added, which is colored as necessary.In this case, the title signal TS is As shown in FIG. B2, the signal level representing the portion corresponding to the blurred portion BB is sloped. In addition, as a second means of emphasizing the edge part, for example, a black shadow part is added to the character part TT as shown in FIG. 2 C1.
The so-called shadow super method is used, in which characters are created by adding SH and irradiating light from the upper left to create shadows. The title signal TS that generates this character is the second
As shown in FIG. C2, it is necessary to have a signal format in which a black signal corresponding to the shadow section SH is added following a signal section corresponding to the character section TT.

Furthermore, as a third method for emphasizing edge portions, as shown in Fig. 2 D1, the so-called outline super is used, in which the background image is used as it is as the character portion TT, and the outline portion OL that forms the outline of the character is colored. The second title signal TS to obtain this character is
As shown in FIG. D2, it is necessary to form a narrow signal that rises at a timing corresponding to the outline portion OL.

Among the above-mentioned methods, a special effect generating circuit having the configuration shown in FIG. 3 has conventionally been used to generate characters of the normal super method. In FIG. 3, a background image signal A representing a background image is multiplied by a key signal K in a multiplication circuit 1 and then supplied to an addition circuit 2. On the other hand, the matt signal B representing the character part TT is the second
In the multiplier circuit 3, the key signal K is sent to the inverter 4.
The signal is multiplied by the inverted key signal obtained by inverting the signal via the adder circuit 2, and the resultant signal is supplied to the adder circuit 2. Thus, the adder circuit 2 generates a composite image signal VO obtained by superimposing the title signal TS based on the matte signal B on the background image signal A. Sent out.

Here, the key signal K is a coefficient signal that falls from 1 to 0 during an interval representing the width in the edge direction of the character portion TT, as shown in FIG. 4A. A state is reached in which the image signal A is not sent out and the matte signal B is sent from the multiplier circuit 3, and thus the portion of the composite image signal VO corresponding to the character portion TT is colored in the color corresponding to the matte signal B. become.

Here, the matte signal B is a color signal that can give the screen a color with uniform phase, saturation, and brightness. VR3
By adjusting , a matte signal B having a set tone is formed.

Regarding B1 and C1 in Fig. 2, when superimposing titles using the border super method or shadow super method described above, the first special effect for forming the text part of the title is applied as shown in Fig. 5. A special effect generation circuit is used in which a circuit section EF1 and a second special effect circuit section EF2 for adding a blurring section BB and a shadow section SH are connected in series. First special effects circuit section
EF1 converts the background image signal A and the matte signal B into a key signal K1 (which has the same signal content as the key signal K as shown in FIG. 4B), as shown by assigning the same reference numerals to the corresponding parts in FIG. 3. By being keyed by , a composite image signal C is generated in which the character portion TT is superimposed on the background image.

The second special effect circuit section EF2 has the same configuration as the first special effect circuit section EF1 (corresponding parts are shown with the same reference numerals and a suffix Y), and thus the composite image signal C and the matte signal D are By keying with the key signal K2, a composite image signal V0 is obtained. Here, when obtaining a border super title, the key signal K2 is set between coefficients 1 and 0, corresponding to the blurring part BB, before and after the waveform part of coefficient 1 corresponding to the character part TT, as shown in FIG. 4C. A signal formed by forming a changing slope portion BB is used. In this way, the key signal K1 of the first special effect circuit section EF1 forms a character section TT similar to that described above with respect to FIG. 2 A1, and then the second special effect circuit section EF2
In this step, the background image part at the periphery of the character part TT is blurred and colored using the key signal K2 to form a blurred part BB, so that the content of the composite image signal V0 becomes as described above with respect to FIG. 2 B1. Become.

On the other hand, when adding a title using shadow super as described above with respect to FIG. 2 C1, the signal shown in FIG. 4D is used as the key signal K2 of the second special effects circuit section EF2. This signal is the character part TT
Following a waveform part with a coefficient of 1 corresponding to , a waveform part corresponding to a shadow part SH falling to a coefficient of 0 is formed, thereby forming a character part similar to A1 in FIG. 2 formed in the special effect circuit part EF1. A composite image signal V0 can be obtained by receiving the shadow part SH based on the matte signal D by the key signal K2 for TT, and thus the title of the shadow super system described above with respect to FIG. 2 C1 can be displayed on the background image. It is possible to realize an image by superimposing the

In this way, in conventional special effects devices, every time one effect is applied to the background image signal, the third
A mixer circuit having almost the same basic configuration as that described above with respect to the figures is provided in each case, so that a wipe effect can be applied to the composite image signal V0 obtained by the configuration of FIG. 3 or FIG. 5, for example. In the case where a special effects circuit section is provided, a mix circuit that uses the wipe signal as a key signal is provided at a subsequent stage of the special effects circuit section.

By the way, mix circuits are generally shown in Figures 3 and 5.
As is clear from the figure, there are two multiplier circuits 1 and 3.
Or 1Y, 3Y and one adder circuit 2 or 2Y
and one inverter 4 or 4Y, and in order to downsize the overall configuration, it is effective to reduce the number of mix circuits. Incidentally, it is generally unavoidable that the structure of a multiplication circuit becomes quite large, and therefore it is desirable to reduce the number of multiplication circuits as much as possible.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and
To obtain the effect of wiping an image formed by superimposing a title on a background image using a wipe signal, the present invention attempts to propose a special effect generating device that can simplify the mixing circuit.

[Summary of the invention]

In order to achieve this purpose, the present invention includes:
A pair of multiplications in which a key signal generation circuit unit synthesizes a title key signal and a wipe key signal over time to form a composite key signal, and receives a background image signal and a title image signal that determines the color tone or image of the title. A composite key signal is input to a mix circuit having the circuit, and a pair of multiplier circuits are keyed and controlled by the composite key signal.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, the special effect generating device has a mix circuit section 11 and a key signal generating circuit 12,
A composite image signal V0 having an image as shown in FIG. 6 is sent from the mix circuit section 11.

In FIG. 6, the first screen section 15 has the B screen as a background image, and a border super title 16 representing the letter A is superimposed thereon, while the second screen section 17 has the B screen as a background image. It becomes. These first and second screen sections 15 and 17 are wiped by a wipe signal forming a wipe border 18, thus superimposing the B screen when the wipe border 18 is wiped in the direction of the first screen section 15. The title 16 that has been displayed is erased and the screen is changed to the B screen, and the wipe border 18 is changed to the second screen section 1.
If the user moves in the direction of 7, the screen is changed from the B screen to a screen in which title 16 is superimposed on the B screen.

In this way, when wiping the first screen section 15 formed by superimposing the title 16 on the B screen and the second screen section 17 formed of the B screen, the key signal generation circuit section 12 generates the wipe key signal WKY and the second screen section 17 formed from the B screen. Composite key signal after receiving title key signal TKY
A KEY is formed and given to the mix circuit section 11.
The key signal generation circuit section 12 generates a title key signal.
TKY (Fig. 7A) is received by the switch circuit 15 which is switched and controlled by the border signal BO (Fig. 7B), and the border signal BO becomes the border key signal BK (Fig. 7J).
Logic "H" at approximately the center of the rising section of
By switching from the coefficient "0" signal input terminal to the title key signal TKY side when
As shown in FIG. 7C, from time _t1 when the border signal BO rises, the title key signal TKY is sent to the switch circuit 16 as the switch output S11.

The switch circuit 16 selects the switch output S11 while the inverted border key signal (D in FIG. 7) is at logic "H" level, and selects the coefficient "1" signal during the other period, that is, the border period TD. Thus, as shown in FIG. 7E, the coefficient "1" is maintained from the time t ₀ when the border period TD begins to the period t ₀ to t ₁ , and after the time t ₁ the switch output S1
The switch output S12 obtained by outputting 2 is input to the multiplier circuit 17.

In contrast, the wipe key signal WKY (Fig. 7F)
is applied to the switch circuit 18 which is switched by the inverted border key signal, and the inverted border key signal (D in FIG. 7) selects the wipe key signal WKY during the border section TD, and selects the coefficient "1" input signal in other sections. By selecting the seventh
As shown in FIG. G, the switch output S13 is outputted to the multiplier circuit 17 by maintaining the coefficient "1" in sections other than the border section TD and outputting the wipe key signal WKY in the border section TD.

Thus, as shown in FIG. 7H, from the multiplier circuit 17, the signal level of the coefficient "0" is maintained because the switch output S12 is a coefficient "0" before the time t ₀ when entering the border section TD, and after that, the signal level of the coefficient "0" is maintained.
Since the switch output S12 has a coefficient of "1" in TD, a waveform part that changes in the same way as the wipe key signal WKY is generated, and at the end of the border section TD.
At _t2 , a composite key signal KEY having a waveform portion exhibiting a change in the title key signal TKY (FIG. 7A) included in the switch output S12 is sent out.

The mix circuit unit 11 includes a first multiplier circuit 21 that receives a key signal KEY, and an inverted key signal obtained by inverting the key signal KEY in an inverter 22.
It has a second multiplier circuit 23 that receives KEY, and the image signals VD1 and VD2 obtained from switch circuits 24 and 25, respectively, are keyed by key signals KEY and added in an adder circuit 26, and then a composite image signal V0 is generated. send it out.

The switch circuit 25 selects the image signal VB representing the B screen which is the background image in the screen of FIG. 6, and as shown in _{FIG .} A switch control signal TG is applied to select the intermediate image signal VB side.

On the other hand, on the screen shown in FIG. 6, the image signal VA and the matte signal M1 representing the A screen to be fitted into the character part of the title 16 are selected by the switch 27, and the title border signal TB is sent to the adder circuit 28.
After being added, the signal is applied to switch circuits 24 and 25.

The title border signal TB is a matte signal M for blurring the periphery of title 16 on the screen (Figure 6).
3 or a color erasing signal CC to form an edge,
In the case of obtaining a title super in the title border system, a blurring matte signal M3 is included, and in the case of a title super in an outline super system, a color erasing signal CC is used.

The image signal related to the title sent out from the adder circuit 28 in this way is selected in the second half of the border section TD by the switch control signal TG (L in FIG. 7) in the switch circuit 25, and the image signal is converted into an image signal.
Sent as VD2. Further, the output of the adder circuit 28 is used as a border key signal in the switch circuit 24.
BK (J in FIG. 7) selects a section other than the border section TD and sends it out as the image signal VD1.

Along with this, the switch circuit 24 outputs a border key signal.
MAT signal M2 during border section TD by BK
In this way, the matte signal M2 can be colored during the border section TD.

In the configuration shown in FIG.
1 (Fig. 7 J) and VD2 (Fig. 7 L), the key signal KEY (Fig. 7 H) and the inverted key signal
Each image signal is multiplied by KEY (Fig. 7 I)
VD11 (Fig. 7 K) and VD12 (Fig. 7 M)
This is then added in an adder circuit 26 to obtain a composite image signal VO (N in FIG. 7).

First of all, the section before the border section TD in Figure 7 is the 6th border section.
In the section where the background image signal VB corresponding to the second screen portion 17 of the screen shown in the figure is sent as the composite image signal VO,
Since the key signal KEY has a coefficient of "0" and the inverted key signal has a coefficient of "1", the image signal VD1 selects the image signal VA or the matte signal M1. signal
Image signal VB, which is not sent out as VD11 and is selected as image signal VD2, is image signal V1.
2 to the adder circuit 26. In this way, the composite image signal VO becomes in a state where the background image signal VB is output.

Next, when entering the border section TD, the key signal KEY
(H in Figure 7) has a waveform containing the wipe signal WKY, whereas the image signal VD1 is in a state where the matte signal M2 is selected, so the image signal VD11
has the content of the mat signal M2 bordered by the wipe signal WKY.

On the other hand, the image signal VD2 is the border section TD.
The image signal VB is selected in the first half of , and the image signal VA or matte signal M1 is selected in the second half, whereas the inverted key signal
Since KEY draws a waveform that is an inversion of the change in the border portion of the wipe key signal WKY, the image signal VD12 obtained from the multiplier circuit 23 is the inverse of the image signal VB, image signal VA, or matte signal M1 at both ends of the border section TD. It will have the same signal content as when a slope is applied. Thus, the composite image signal
VO changes the screen from the background image signal VB to the matte signal M2 at the start end of the border section TD, and after the matte signal M2 continues to be generated in the center of the border section, the image signal VA or the matte signal M1 is generated at the end of the border section TD. The content will be such that the screen changes to . In this way, the wipe border 18 on the screen is formed at the boundary between the second screen section 17 and the first screen section 15, and by moving this wipe border 18, a screen is obtained in which the screen is switched. .

Thereafter, in the section after the border section TD, the key signal KEY enters a state in which the waveform of the title key TKY changes. And at this time, the image signal VD
Since the image signal VA or matte signal M1 is selected as 1, the image signal VD11 maintains the signal VA or M1 along the waveform of the title key signal TKY for a while and then gradually disappears. Become. On the other hand, the image signal VD2 is in a state where the image signal VB is selected, and by keying with a waveform that is an inversion of the waveform of the title key signal TKY, the contents of the image signal VD12 are changed to the image signal VB after a while. The content will be such that it stands up at an angle.

Thus, the composite image signal VO is transmitted to the first screen section 15.
When the title signal is entered, the title signal consisting of the image signal VA or matte signal M1 continues for a while in response to the title key signal TKY, and then the image is softly inverted to the background image signal VB.

Therefore, according to the configuration of FIG. 1, the background image formed by superimposing the title 16 as described above with respect to FIG. 6 is converted to the second screen portion 17 containing only the background screen via the wipe border 18. This means that a title super with a wipe border like this can be realized. Accordingly, according to the configuration shown in FIG. 1, a composite key signal is formed by combining the title key signal TKY and the wipe key signal WKY over time in the key signal generating circuit section 12, and this signal is used as a background image signal and a title image signal. By using it as a key signal for mixing, only one mixing circuit is required in common for the two effects of the title key and wipe key, which simplifies the overall configuration of the special effect generator. can be converted into

In addition, when obtaining a so-called normal super (A1 in Fig. 2) in which the title formed to superimpose on the background image is not bordered, the title key signal TKY is changed as shown in A1 and A2 in Fig. 8. Addition circuit 28 over the entire range
What is necessary is to prevent the title border signal TB from being added to the title border signal TB.

Further, in order to obtain the border super described above with reference to FIG. 2 B1, the title border signal TB is generated at the timing of both ends of the title key signal TKY as shown in FIG. 8 B1 and B2, and thus the adder circuit As a result of addition to the matte signal M1 in step 28, a border having a specific tone may be added.

Furthermore, when obtaining the shadow super described above with respect to FIG. 2 C1, a title border signal TB that rises at the timing of the trailing edge of the title key signal TKY is added to the adder circuit 28 as shown in FIG. 8 C1 and C2. All you have to do is let it happen.

Furthermore, in the case of the outline super described above with respect to FIG. 2 D1, the title key signal TKY is generated in the border area as shown in FIG.
It is sufficient to use a title border signal TB that does not add anything to the adding circuit 28 over the entire period when the title border signal TB rises.

In the above embodiment, the present invention is applied to a screen having a wipe border 18 colored by the matte signal M2 as shown in FIG. 6, but instead of this, FIG. As shown in the figure, if it is only necessary to form a screen switching section 31 that changes the screen between the first screen section 15 and the second screen section 17 in a soft manner, the key signal generation circuit section 12
As shown in FIG. 10A, the wipe key signal WKY which changes the level with a slope is received in the screen change section TC, and the same change as the wipe key signal changes during and before the screen change section TC. and after the screen change interval TC has elapsed, a composite key signal KEY having the waveform of the title key signal TKY is obtained,
This may be applied to the multiplier circuits 21 and 23 of the mix circuit section 11 together with the inverted composite key signal. In this way, as shown in FIG. 10D, the screen has the background image signal VB in the section before the screen change section TC, and then the screen is softly changed from the background image signal TB to the title signal VA or M1 during the screen change section TC. , then the title signal VA or M
It is possible to obtain a composite image signal VO that maintains 1 and then softly changes the screen to the background image signal VB. Thus, by using the configuration shown in FIG. 1, it is possible to obtain a title super wipe image without borders as shown in FIG. 9.

The title key signal TKY shown in FIG. 1 is generated by a title key signal generation circuit as shown in FIG. The title key signal generation circuit clips the input video signal V _IN in a clip circuit 35 to obtain a character signal input S31 having a predetermined time width as shown in FIG. The vertical signal forming circuit 36 includes four stages of cascade-connected 1H+nCK delay circuits 37, 38, 39,
At 40, a character signal input S31 is received.

Each of the delay circuits 37 to 40 is constituted by a variable delay circuit, and the delay amount nCK is controlled to be 0 or 0 or 1 to 3, for example, as necessary.
Controlled by nCK. Thus, from each stage 1H, 2H,
3H, 4H delay output S32, S33, S34, S3
5 (Figure 12 B2, B3, B4, B5) or 1H
+nCK, 2H+2nCK, 3H+3nCK, 4H+4nCK delay output S32, S33, S35 (Fig. 13 B2,
B3, B4, B5 and Figure 14 B2, B3, B
4, B5).

The delayed output S35 in Fig. 4 is NAM (non
OH delay output S36 consisting of character signal input S31 to mix circuit 43 (additive mix)
1, B1 in FIG. 13, B1 in FIG. 14) and sent out as a signal component of the vertical direction signal S37 (C in FIG. 12, C in FIG. 13, C in FIG. 14).

On the other hand, the first and third delayed outputs S32 and S34 are output to the NAM mix circuit 41.
After NAM mix, NAM mix circuit 44
The output of the circuit 43 is mixed with the NAM at
It is sent out as a signal component of the vertical direction signal S37.

Further, the delayed output S33 in FIG. 2 is NAM mixed with the output of the NAM mix circuit 44 in the NAM mix circuit 42, and sent out as a signal component of the vertical direction signal S37.

In this way, the output of the NAM mix circuit is applied to the widening circuit 45 as the output signal S37 of the vertical signal forming circuit 36. The widening circuit 45 increases the horizontal pulse width of each signal component of the vertical signal S37 by 2.
This circuit is for widening the clock width by 2CK, and receives the vertical direction signal S37 to 1CK (representing one clock time in the horizontal direction) delay circuits 51 and 52 which are cascade-connected to each other. The 2CK delay output 51 is NAM
In the mix circuit 53, the vertical direction signal S37
The output is NAM mixed with the 1CK delay output S52 in the NAM mix circuit 54, and the output of the NAM mix circuit 54 is applied to the horizontal direction signal forming circuit 60 as the output S53 of the widening circuit 45.

The horizontal direction signal forming circuit 60 converts each character signal component S36 to S35 (FIG. 12C, FIG. 13C, and FIG. 14C) included in the output S53 of the widening circuit 45 every 1H into one clock time 1CK. A horizontal direction signal including the title border signal component is formed by delaying the signal component in units, and the widened output S53 is received by eight stages of 1CK delay circuits 61 to 68 connected in cascade.

The resulting 1CK delay output S54 is NAM
In the mix circuit 69, the 7CK delay output S60 and
NAM mixed, 2CK delay output S55 is
6CK delay output S in NAM mix circuit 70
59 and NAM mix, 3CK delay output S56
is mixed with the 5CK delay output S58 in the NAM mix circuit 71, and the 8CK delay output S6
1 is the widening circuit S in the NAM mix circuit 72.
53 and NAM mixes.

In addition, the 4CK delayed output S57 is NAM-mixed with the output of the NAM mixer circuit 71 in the NAM mixer circuit 73, and the output is NAM-mixed with the output of the NAM mixer circuit 71 in the NAM mixer circuit 74.
The output of NAM is mixed with the output of NAM.
NAM mix circuit 6 in mix circuit 75
9 and NAM mixer, and its output is
NAM mixer 76 performs NAM mixer with the output of the NAM mixer circuit. Thus
The output of the NAM mix circuit 76 is the horizontal direction signal S
62 is applied to the arithmetic circuit 81 of the title border signal output circuit 80 as an addition input.

The second delayed output S33 of the vertical signal forming circuit 36 is applied to this subtracting circuit 81 as a subtracting input through a delay circuit 82, and this delayed output S63
A subtracted output S64 obtained by subtracting the above from the horizontal direction signal S62 is sent as a title border signal TKY through a waveform shaping circuit 83 consisting of a sin ² arithmetic circuit.

Furthermore, the delayed output S36 is the character signal output circuit 85.
The signal is sent out as a character signal LKY through the switch circuit 86 and the sin ² waveform shaping circuit 87.

The switch circuit 86 is provided with an outline signal OL as another switching input, so that when obtaining an outline super, this outline signal OL is applied.
OL is sent out as a character signal LKY.

In the configuration shown in FIG. 11, each NAM mix circuit is weighted and controlled according to each mode of the title super, ie, normal super, border super, shadow super, and outline super, so that each mode is applied to the video input V _IN . The title border signal TKY and character signal LKY corresponding to the text are transmitted.

First, in the border super mode described above with reference to FIG. 2 B1, the vertical direction signal forming circuit 36
NAM mix circuits 43 and 41 are each 1/4,
By controlling the 1/2 weighting, the output terminals of the NAM mixer circuit 43 have signals B1 and B5 in FIG.
0H delay output S36 with 1/4 amplitude as shown in
and 4H delayed output S35 are obtained, and the output terminal of the NAM mixer circuit 41 is provided with signals B2 and B in FIG.
1H delay output S with 1/2 amplitude as shown in 4
32 and 3H delayed outputs S34 are obtained.

On the other hand, NAM mix circuits 44 and 42
is weighted by 1, and as a result, the 2H delayed output S33 is output from the NAM mix circuit 42 with an amplitude of 1 as shown in FIG. 12B3, and thus the vertical direction signal S37 becomes the signal as shown in FIG. Components S36, S32, S33, S34, S3
A vertical direction signal S37 is obtained in which the amplitude of 5 is sequentially controlled to 1/4, 1/2, 1, 1/2, and 1/4.

This vertical signal S37 is widened by a two clock time 2CK in a widening circuit 45, and then applied to a horizontal signal forming circuit 60.

The NAM mix circuits 72, 69, 70, 71 of the horizontal direction signal forming circuit 60 are sequentially 1/5, 2/5, 3/5,
A weighting control of 4/5 is performed, which results in the 12th
As shown in Figure D, for each signal component of the vertical direction signal S37, the rising and falling portions have a step shape of 5 steps, and the change of 1 step corresponds to the amplitude of each signal component S36, S32 to S35. Border waveforms with different rising slopes that vary in size are added. That is, the horizontal direction signal components S36T and S35T corresponding to the signal components S36 and S36 have a gentle slope corresponding to the amplitude having a weight of 1/4, and the signal component S3
2 and horizontal direction signal component S32 corresponding to S34.
T and S34T have slope portions with twice the slope corresponding to the amplitude of the weight of 1/2. Furthermore, signal component S33
The horizontal signal component S33T corresponding to has a slope with a slope four times the amplitude of a weight of 1.

In this way, the vertical direction signal forming circuit 36 is synchronized with approximately the pulse center position of the signal component S33T corresponding to the 2H delayed output S33 of the horizontal direction signal S62 sent from the horizontal direction signal forming circuit 60.
A delayed character signal S63 is sent from the delay circuit 82 based on the 2H delayed output S33, and this is subtracted from the output S62 in the subtraction circuit 81, resulting in the rising and falling slopes of the signal component S33T as shown in FIG. 12F. The subtracted output S6 has a border signal component S33B with a waveform similar to that of the left one.
4 (FIG. 12F) is sent out as the title border signal TKY through the waveform shaping circuit 83.

On the other hand, the delayed character signal S63 is output from the character signal output circuit 8.
5 as a character signal LKY through the switch circuit 86, and thus the title voice key signal
By applying TKY to the switch circuit 15 of the key signal generation circuit section 12 of FIG. 1 and generating the title border signal TB of the mix circuit section 11 of FIG. 1 based on the character signal LKY, in B1 of FIG. Both ends of the character portion TT in the horizontal direction are formed by the border signal component S33B, and at the top and bottom ends in the vertical direction, a blurred portion BB having a slope and different tone is formed by sequentially S36T, S32T or S34T, S35T. It is possible to realize border super.

In addition, in the mode for obtaining the shadow super shown in FIG. 2 C1, the value n that determines the delay amount nCK of the delay circuits 37 to 40 of the vertical direction signal forming circuit B6 is selected to be 1 to 3, and thus the value n is selected to be 1 to 3. and FIG. 13 A and B1 to B5 corresponding to B1 to B5.
As shown in , 1H to 4H delay outputs S32 to S35 are
It will be delayed sequentially by 1H + nCK,
Thus, in the vertical signal forming circuit 36
Vertical signal S3 obtained by NAM mixing
7 (Fig. 13C) delayed outputs S32, S33, S
Signal components S32L, S3 corresponding to 34, S35
The pulse widths of 3L, S34L, and S35L extend backward by nCK, 2nCK, 3nCK, and 4nCK, respectively.

In this mode, the horizontal direction signal forming circuit 60
The NAM mix circuits 72 and 76 are weighted with a weight of 1, so that the horizontal signal S62 also has a signal component having the same pulse width and phase as the vertical signal S37.

On the other hand, the delay circuit 82 outputs a 1H cycle delay output S63 that is generated in synchronization with the rising position of each signal component of the horizontal direction signal S62, as shown in FIG. 13D.
As a result, the subtracted output S64 of the subtraction circuit 81 has a delay amount of 0, nCK, nCK, 2nCK,
Signal components S32S, S33S, S34S, S where the pulse width extends backward like 3nCK and 4nCK
35S, and this is sent out as the title border signal TKY.

Here, for a delay time of 4H or more, the pulse width of the signal component is wide, but the signal component S35S
Thereafter, pulses are generated while maintaining the same state, thus forming a diagonal shadow part SH1 consisting of signal components S32S to S35S on the right side of the character part TT of the title, as shown in FIG.
Thereafter, it is possible to generate a shadow portion SH2 whose width does not change based on the signal component S35S.

In contrast, the lower shadow part of the shadow part SH
SH3 corresponds to FIG. 13, and as shown in FIG. 14, the pulse width of the vertical direction signal S62 is
A signal component S36 that occurs at a timing corresponding to the left edge of TT and whose pulse width gradually decreases.
S, S32S, S33S, S34S, and S35S are controlled in sequence.

Thus, the title border signal TKY output based on the horizontal direction signal S62 can realize the title super having the shadow portion SH described above with respect to FIG. 2 C1.

Furthermore, in the outline super mode, the switch circuit 86 of the character signal output circuit 85 is switched to the outline signal OL side and this is sent out as the character signal LKY, as shown in FIG.
An outline super with the border described above for 1 is realized.

〔Effect of the invention〕

As described above with respect to the embodiment shown in FIG.
By mixing the background image signal and the matte signal in the mixer circuit section 11 after combining them in step 2, it is sufficient to provide one mixer circuit for the title key signal TKY and the wipe key signal WKY. A special effect generating device having a simpler configuration can be easily realized.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram showing an embodiment of the special effect generating device according to the present invention, Fig. 2 is a schematic diagram and signal waveform diagram for explaining the title super which may occur;
Fig. 3 is a schematic connection diagram showing a conventional special effect generating device, Fig. 4 is a signal waveform diagram showing signals of each part thereof, and Fig. 5 is a schematic diagram showing another example of a conventional special effect generating device. 6 is a schematic diagram for explaining the title super wipe effect that can be obtained with the configuration of FIG. 1, and FIGS. 7 and 8 are signals showing the signals of each part of FIG. 1. 9 is a schematic diagram showing a modified example of special effects, FIG. 10 is a signal waveform diagram showing another embodiment of the present invention, and FIG. 11 is a connection diagram showing an example of a title key signal generation circuit. , FIGS. 12 to 14 are signal waveform diagrams showing the signals of each part,
FIG. 15 is a schematic diagram for explaining the shadow super which can be obtained by the configuration of FIG. 11. 11...Mix circuit section, 12...Key signal generation circuit section, 21, 23...Multiplication circuit, 15, 1
6, 18, 24, 25, 27... switch circuit,
26... Addition circuit, 36... Vertical direction signal forming circuit, 45...... Widening circuit, 60... Horizontal direction signal forming circuit, 80... Title border key signal output circuit, 85... Character signal output circuit.

Claims (1)

[Claims] 1. A special effect generating device that wipes a screen formed by superimposing a title on a background image, which generates a composite key signal obtained by combining a title key signal and a wipe key signal over time. a key signal generating circuit unit to generate a key signal, a background image signal and a title image signal determining the color tone or image of a title, respectively, to a pair of multiplier circuits forming a mix circuit, and the pair of multiplier circuits generate the composite key signal. 1. A special effect generating device comprising: a mix circuit unit which is keyed and controlled by a mixer circuit section;