JP3350968B2 - Video signal synthesizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal synthesizing apparatus for synthesizing three or more video signals.

[0002]

2. Description of the Related Art As a video signal synthesizing apparatus for obtaining a three-dimensional video signal by synthesizing a plurality of two-dimensional video signals, DME (D
igital Multi Effector) combiners are known. FIG. 4 shows a basic configuration of a conventional three-channel DME combiner that combines three video signals to obtain a three-dimensional video. In this three-channel DME combiner, two first and second two-channel combiners 1 and 2 are cascade-connected, and first, two video signals DME ₁ and DME ₁
ME ₂ is synthesized by the first two-channel combiner 1, and the synthesized video signal DME ₁₂ and the remaining video signal DME ₃ are synthesized by the second two-channel combiner 2.
It is configured to obtain a desired composite video signal DME ₁₂₃ .

In such a configuration, the first and second
The video signals input to the two-channel combiners 1 and 2 are composed of a video signal V, a key signal K and a depth signal Z. By appropriately combining the key signal K and the depth signal Z with desired values, the edge of the composite video is And the intersection area can be made smooth without jaggedness.

Here, basic edge processing in the combining operation of the two-channel combiner will be described with reference to FIG. 5, taking an example where two planes A and B intersect. In the drawing, BG is the background, a is the edge of the area where the plane A is on the plane B, b is the edge of the area where the plane B is on the plane A, and c is the edge of the area where the plane B is on the plane A. An edge d of a certain region indicates an intersection region between the plane A and the plane B, respectively.

Edge a: As shown in the following equation (1), A
Mixing the video signal V _A and V _B with a key signal K _A input. _{K A · V A + (1} -K A) · V B ... (1) ( where, 0 ≦ K _A ≦ 1) edges b; as shown in the following equation (2), a key signal K _B of the B input mixing the video signal V _a and V _B with. _{K B · V B + (1} -K B) · V A ... (2) ( where, 0 ≦ K _B ≦ 1) edges c; as shown in the following equation (3), the key signal K _A and the K _B The picture F and the background BG are mixed using the composite key signal K _BG . K _BG · V _F + (1−K _BG ) · V _BG (3) K _BG = 1− (1−K _A ) (1−K _B ) Intersecting area d; using depth signals Z _A and Z _B Generates a priority signal Z _AB which is a kind of key signal, and
As shown in (4), mixing the video signal V _A and V _B. Z _AB · V _A + (1−Z _AB ) · V _B (4) The two-channel combiner obtains a composite image having smooth edges and intersection areas by performing the above processing.

[0006]

However, the conventional three-channel DME combiner in which two two-channel combiners having the above-mentioned functions are cascade-connected has a video signal synthesis order and picture arrangement corresponding to each image to be synthesized. Depending on the vertical relationship of the position, a smooth edge cannot be obtained,
There is a problem that only an unnatural edge having a step shape can be obtained.

Hereinafter, this problem will be described in more detail. Here, for the sake of simplicity of description, as shown in FIG. 6, three plane images A, B, and C are viewed from above as A, B, and C.
Will be described with reference to FIGS. 7 and 8. As shown in FIG. 7 (a), after combining the video signal DME _B video signals DME _A and the image B of the image A, the mixed video signal DME _AB and the video signal DME _C image C
Are synthesized, that is, when synthesized in the depth order, the synthesized image AB of A and B is
Are mixed to make the edge of A smooth. Then, even when the combined image AB and the image C are combined, the key signal K
As a result, B and C are mixed, and the edge of B becomes smooth.

[0008] In contrast, as shown in FIG. 7 (b), after combining the video signal DME _C of the video signal DME _A and the image C of the image A, the mixed video signal DME _AC and the two images AC when synthesizing the video signal DME _B image B located in the middle, but the edge of the B is smooth is mixed with B and C by the key signal K, the edge of a is a jagged because there is no key signal Would. Specifically, by combining the image A and the image C first, as shown in FIG. 8A, an image of C that cannot be seen at the edge portion of A appears. To make the image of C invisible, it is only necessary to combine the two images A and C. In this case, however, the edges are jagged as shown in FIG. 8B.

As described above, this problem can be avoided if the order of composition is performed in the order of higher (or lower) arrangement order. However, unlike the case of the switcher, in the case of the DME combiner, the arrangement order of images is generally higher. Varies from pixel to pixel and is not uniform at all locations in the screen, so the above problem cannot be simply solved.

The same problem as described above occurs when the image A is translucent and the image B is opaque. That is, if the image A and the image C are combined first, A and C may be mixed, and an image of C, which is opaque and may not be seen, may be seen.

The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a smooth edge and intersection area when three or more video signals are synthesized, and to obtain an unnatural image. It is an object of the present invention to provide a video signal synthesizing apparatus capable of obtaining a video in which no video is seen.

[0012]

In order to achieve the above object, a video signal synthesizing apparatus according to the present invention comprises at least a first signal , a second signal, and a second signal comprising a video signal, a key signal, and a depth signal .
And a video signal synthesizing device for synthesizing a third video signal, comparing each depth signal with each other, weighting each video signal in the depth direction and generating a priority signal, and a complementary signal of each key signal. A circuit that generates a signal, a circuit that generates a complementary signal of each of the priority signals, a circuit that multiplies all of the complementary key signals, and outputs a complementary signal of the multiplied signal as a composite key signal, A circuit for performing a reciprocal operation of a signal and outputting the resultant signal as a composite key reciprocal signal; and the first and second images
Complementary signal of priority signal related to signal and second video
Multiplied by the complementary key signal of the key signal
The priority signals related to the first and second video signals are added.
Of the first and third video signals.
Key signal related to complementary signal of Ority signal and third video signal
The result of multiplying the complementary key signal of the
The result of adding the priority signal related to the image signal,
Multiply a key signal and a video signal related to one video signal
Processing of the video signal related to the first video signal
A first shaping circuit for processing, and the first and second video signals
And a key related to the first video signal
The result of multiplying the complementary key signal of the signal by the first and second
Add the complementary signal of the priority signal related to the video signal
And the priorities of the second and third video signals.
Of the key signal related to the complementary signal of the
The second and third video signals are added to the result of multiplying the complementary key signal.
The result of adding the priority signals related to the
Multiplying the key signal and video signal related to the video signal
With this, the shaping process of the video signal relating to the second video signal is performed.
And a second shaping circuit for performing the processing on the first and third video signals.
Key signal related to the priority signal and the first video signal
Multiplied by the complementary key signal of the first and third images
The result of adding the complementary signal of the priority signal related to the signal
And the priorities of the second and third video signals
The complementary key signal of the signal and the key signal relating to the second video signal
The result of the multiplication is added to the priorities of the second and third video signals.
The result of adding the complementary signal of the Ority signal and the third video
To multiplying the key signal and the video signal according to the signal
A video signal shaping process for a third video signal is performed.
A third shaping circuit and the first, second, and third shaping circuits;
The circuit includes a circuit for adding the video signal shaped by the circuit and a circuit for multiplying the added video signal by the composite key reciprocal signal to generate a composite video signal.

In the video signal synthesizing apparatus of the present invention, a circuit for generating a synthesized video signal with a background by adding a signal obtained by multiplying the added video signal by a complementary signal of the synthesized key signal and a background video signal is added. To have. In the video signal synthesizing apparatus of the present invention,
Is performed for each pixel .

In the video signal synthesizing apparatus according to the present invention, each of the above processes is performed for each pixel.

[0015]

According to the video signal synthesizing device of the present invention, when at least three video signals including a video signal, a key signal, and a depth signal are input to the device, the priority signal generating circuit converts each of the depth signals to each other. The video signals are compared and weighted in the depth direction, and a priority signal corresponding to the weight is generated, and is output to the complementary circuit and the video signal shaping circuit. In the complementary circuit, a complementary signal of each key signal and a complementary signal of each priority signal are generated. Further, in the composite key signal generation circuit, all of the obtained complementary key signals are multiplied, and a complementary signal of the multiplied signal is obtained and output to the composite key reciprocal signal generation circuit as a composite key signal. In the composite key reciprocal signal generation circuit, the reciprocal of the composite key signal is obtained, and this is output to the composite video signal generation circuit as a composite key reciprocal signal.

In the video signal shaping circuit, for each input video signal, a video signal, a key signal, and a signal obtained by adding a complementary priority signal and a complementary key signal of a video signal to be weighted to each priority signal for the video signal. Is multiplied and the video signal is shaped.
These shaped video signals are output to the video signal adding circuit. In the video signal adding circuit, all of the shaped video signals are added, and the added shaped video signal is output to the composite video signal generating circuit. In the composite video signal generation circuit, the input addition-shaped video signal and the composite key reciprocal signal are multiplied and output as a composite video signal.

According to the video signal synthesizing apparatus of the present invention, in the synthesized video signal with background signal, a signal obtained by multiplying the added video signal by the synthesized key signal and the video signal of the background is added to the background signal. Is output.

According to the video signal synthesizing apparatus of the present invention, the above-described processing is performed for each pixel.

[0019]

FIG. 1 is a block diagram showing an embodiment of a three-channel video signal synthesizing apparatus according to the present invention.
Instead of combining B and C sequentially as in the conventional device,
An apparatus for synthesizing at the same time is shown.

In FIG. 1, V_A, V_B, V_CEach
Video signals of the video signals for the images A, B and C, K_A,
K_B, K_CAre the keys of the video signals for images A, B, and C, respectively.
Signal, Z _A, Z_B, Z_CAre the images for images A, B and C respectively
Depth signal of image signal, V_BGIs the background video signal
No. 10 is a priority signal generation circuit, 20 is a constant generator
A synthesis key signal generation circuit;
Is a composite key reciprocal signal generation circuit, 51 is a first video signal
Shaping circuit, 52 is a second video signal shaping circuit, 53 is a second video signal shaping circuit.
3 is a video signal shaping circuit, and 60 is a shaping video signal addition circuit.
, 70 is a composite video signal generation circuit, and 80 is a background signal.
2 shows a combined video signal generating circuit with a C code.

The priority signal generating circuit 10 includes priority determining circuits 101, 102 and 103. The priority determination circuit 101 determines whether the image A
Use video signal of the depth signal Z _A and enter the depth signal Z _B of the image B for the video signals of both video signal video signal V _A,
Weighting is performed for each pixel of the image corresponding to V _B , specifically, a weighting coefficient is applied, and the result is output as a priority signal Z _AB to the constant generation and complementary circuit 20 and the first video signal shaping circuit 51, respectively. . here,
The priority signal Z _AB satisfies the condition of 0 ≦ Z _AB ≦ 1, and its value indicates the expressed priority relationship between the image A and the image B in the composite video. Specifically, when the value of the priority signal Z _AB is “1”,
This indicates that the image A in the composite video is above or before the image B in the depth direction. On the other hand, when the value of the priority signal Z _AB is “0”, the image A in the composite video is below or after the image B in the depth direction, that is, the image B is above or below the image A in the depth direction. Indicates that it is before.

The priority determination circuit 102 determines whether the image A
Use video signal of the depth signal Z _A and enter the depth signal Zc image C video signals of both video signal video signal V _A,
Weighting is performed for each pixel of the image corresponding to V _C , and the result is output as a priority signal Z _AC to the constant generation and complementary circuit 20 and the first video signal shaping circuit 51, respectively. Here, the priority signal Z _AC is 0 ≦
The condition of Z _AC ≦ 1 is satisfied, and the value indicates the priority relationship expressed between the image A and the image C in the composite video. Specifically, when the value of the priority signal Z _AC is “1”, it indicates that the image A in the synthesized video is above or before the image C in the depth direction, and the value of the priority signal Z _AC is “0”. "Indicates that the image A in the composite video is below or after the image C in the depth direction, that is, the image C is above or before the image A in the depth direction.

The priority determination circuit 103 determines whether the image B
Video signal V _B of the depth signal Z _B and enter the depth signal Zc image C video signal both video signals use a video signal,
Weighting is performed for each pixel of the image corresponding to V _C , and the result is output as a priority signal Z _BC to the constant generation and complementary circuit 20 and the second video signal shaping circuit 52, respectively. Here, the priority signal Z _BC is 0 ≦
The condition of Z _BC ≦ 1 is satisfied, and the value indicates the priority relationship expressed between the image B and the image C in the composite video. Specifically, when the value of the priority signal Z _BC is “1”, it indicates that the image B in the synthesized video is above or before the image C in the depth direction, and the value of the priority signal Z _BC is “0”. Indicates that the image B in the composite video is below or after the image C in the depth direction, that is, the image C is above or before the image B in the depth direction.

The constant generation and complementary circuit 20 includes constant generators 201, 202, 203, 204, 205, 206 and complementary circuits 211, 212, 213, 214, 21
5,216. Each constant generator 201
To 206 generate a constant “1” and generate the generated constant “1”
Are output to the first video signal shaping circuit 51, and the constant generators 203 and 204 are output to the second video signal shaping circuit 51.
, And the constant generators 205 and 206 output to the third video signal shaping circuit 53, respectively.

The complementary circuit 211 receives the key signal K _A of the video signal for image A, subtracts the input value from the constant “1”,
The result is output to the second video signal shaping circuit 52 as a complementary signal (1−K _A ). Complementary circuit 212 generates image B
Enter the key signal K _B of use video signal, it subtracts the input value from the constant "1" into the first video signal shaping circuit 51 and the resulting complementary signals (1 over K _B). Complementary circuit 2
Reference numeral 13 inputs the key signal K _C of the image C video signal, subtracts the input value from the constant “1”, and converts the result to a complementary signal (1).
−K _C ) to the first video signal shaping circuit 51.

The complementary circuit 214 receives the priority signal Z _AB output from the priority determination circuit 101 of the priority signal generation circuit 10, subtracts the input value from a constant “1”, and converts the result to a complementary signal (1-Z). _AB ) to the second video signal shaping circuit 52. The complementary circuit 215 receives the priority signal Z _AC output from the priority determination circuit 102 of the priority signal generation circuit 10, subtracts the input value from the constant “1”, and sets the result as a complementary signal (1−Z _AC ). The signal is output to the third video signal shaping circuit 53. The complementary circuit 216 is provided by the priority determination circuit 103 of the priority signal generation circuit 10.
Enter the priority signal Z _BC output from subtracts the input value from the constant "1" into the third video signal shaping circuit 53 and the resulting complementary signals (1 over Z _BC).

The composite key signal generation circuit 30 includes a multiplier 30
1 and 302 and a complementary circuit 303. The multiplier 301 outputs a complementary signal (1-K _A ) of the complementary circuit 211 and a complementary signal (1-K _A ) of the complementary circuit 212.
_B ) and outputs a signal (1−K _A ) · (1−K _B ). The multiplier 302 multiplies the output signal (1−K _A ) · (1−K _B ) of the multiplier 301 and the output complementary signal (1−K _C ) of the complementary circuit 213 to generate a signal (1−K _A). ) ・
(1−K _B ) · (1−K _C ) is output. Complementary circuit 30
3 is an output signal (1-K _A ) · (1-K _A ) of the multiplier 302.
_B ) · (1-K _C ) is input, the input value is subtracted from the constant “1”, and the result is output as a composite key signal K _BG shown below. _{K BG = {1- (1-} K A) · (1-K B) · (1-K C)}

The composite key reciprocal signal generation circuit 40 receives the composite key signal K _BG output from the complementary circuit 303 of the composite key signal generation circuit 30, takes the reciprocal of the input value, and obtains the composite key reciprocal signal (1/1). K _BG ) to the composite video signal generation circuit 70.

The first video signal shaping circuit 51 comprises mixers 511 and 512 and multipliers 513, 514 and 515, and includes a key signal K _A and a complementary signal (1-K).
_B ), (1-K _C ) and the priority signals Z _AB , Z
Performs shaping of the video signal V _A of the image A with _AC.

The mixers 511 and 512 perform the mixing process of the input signal based on the rule shown in FIG. 2 and the following equation (5). That is, the signal to the terminal T ₁ x, the signal I ₁ to the terminal T _2, the signal I ₂ to the terminal T ₃ are input, the input signal I to the input signal x and the terminal T ₂ of the to the terminal T ₁
The product x · I ₁ and _1, terminal a material obtained by adding the product of the input signal I ₂ to the signal and the terminal T ₃ to the input signal x by subtracting from the constant "1" to the terminal T ₁ as an output signal O output from the T _4. O = x · I ₁ + (1−x) · I ₂ (5) All the mixers described below are configured to obtain an output signal according to this rule.

The mixer 511 has a terminal T ₁ and a priority signal Z output from the priority determination circuit 101.
The _AB, the constant "1" output from the constant generator 201 to the terminal T _2, the complementary signal output from the complementary circuit 212 to the terminal T ₃ a (1-K _B) Type respectively, equation (5) ｛Z _AB + (1−Z _AB ) · (1−
K _B )｝ is output to the multiplier 513.

The mixer 512 is connected to the terminal T ₁ by the priority signal Z output from the priority determination circuit 102.
The _AC, the constant "1" output from the constant generator 202 to the terminal T _2, the complementary signal output from the complementary circuit 213 to the terminal T ₃ a (1-K _C) type respectively, the equation (5) The signal {Z _AC + (1−Z _AC ) · (1−K _C )} is output to the multiplier 513 in accordance with

The multiplier 513 outputs the output signal {Z _AB + (1−Z _AB ) · (1−K _B )} of the mixer 511 to the mixer 512.
Multiplied by the output signal {Z _AC + (1−Z _AC ) · (1−K _C )} to generate the signal [{Z _AB + (1−Z _AB ) · (1−
KB _B } {{Z _AC + (1-Z _AC ). (1-K _C )}] is output to the multiplier 514. The multiplier 514 is a multiplier 51
3 of the output signal _{[{Z AB + (1-} Z AB) · (1-K B)}
[{Z _AC + (1−Z _AC ) · (1−K _C )}] and the key signal K _{A of the} image A, and the signal [{Z _AB + (1−
_{Z AB) · (1-K} B)} · {Z AC + (1-Z AC) · (1
−K _C )｝] · K _A is output to the multiplier 515. The multiplier 515 outputs the output signal [｛Z _AB + (1-Z
_{AB) · (1-K B} )} · {Z AC + (1-Z AC) · (1-
K _C)}] · K _A and by multiplying the video signal V _A of the image A, the output of the first video signal shaping circuit 51 described below is shaped video signal MV _A shaping video signal adding circuit 6
Output to 0. _{MV A = [{Z AB +} (1-Z AB) · (1-K B)} · {Z AC + (1-Z AC) · (1-K C)}] · K A · V A

The second video signal shaping circuit 52 is constituted by mixers 521, 522 and the multiplier 523,524,525, key signal K _B, the complementary signal (1-Z
_AB ), (1-K _A ) and the priority signal Z _BC are used to perform a shaping process on the video signal _VA of the image B.

The mixer 521 is connected to the terminal T ₁ of the complementary circuit 21.
The output complementary signals from 4 (1-Z _AB), output from the constant generator 203 to the terminal T ₂ the constant "1", the terminal T
₃ priority judging circuit 103 Re respectively the outputted priority signal Z _BC from input to the above (5) signal {accordance formula scheme _{(1-Z AB) + Z} AB · (1-
K _A )｝ is output to the multiplier 523.

The mixer 522 is connected to the terminal T ₁ and outputs the priority signal Z output from the priority determination circuit 103.
_BC , the constant “1” output from the constant generator 204 at the terminal T ₂ , and the complementary signal (1-K _C ) output from the complementary circuit 213 at the terminal T _3. The signal {Z _BC + (1−Z _BC ) · (1−K _C )} is output to the multiplier 523 in accordance with

The multiplier 523 outputs the output signal {(1−Z _AB ) + Z _AB · (1−K _A )} of the mixer 521 to the mixer 522.
The output signal _{{Z BC + (1-Z} BC) · (1-K C)} and by multiplying the signal _{[{(1-Z AB)} + Z AB · (1-
K _A)} · {output to _{Z BC + (1-Z BC} ) · (1-K C)}] of the multiplier 524. The multiplier 524 includes the multiplier 52
3 [{(1−Z _AB ) + Z _AB · (1−K _A )}}
_{· {Z BC + (1-} Z BC) · (1-K C)}] and by multiplying the key signal K _B of the image B, the signal _{[{(1-Z AB)} + Z
_AB・ (1-K _A )｝ ・ ｛Z _BC + (1-Z _BC ) ・ (1-K
_C)}] and outputs a · K _B to the multiplier 525. Multiplier 52
5 is an output signal of the multiplier 524 [｛(1−Z _AB ) + Z _AB
・ (1-K _A )｝ ・ ｛Z _BC + (1-Z _BC ) ・ (1-
K _C )｝] · K _B is multiplied by the video signal V _{B of the} image B, and the shaped video signal MV _B output from the second video signal shaping circuit 52 shown below is shaped by the shaped video signal adding circuit 6
Output to 0. _{MV B = [{(1-} Z AB) + Z AB · (1-K A)} · {Z BC + (1-Z BC) · (1-K C)}] · K B · V B

The third video signal shaping circuit 53 comprises mixers 531 and 532 and multipliers 533 and 534 and 535. The third video signal shaping circuit 53 has a key signal K _C and a complementary signal (1-Z).
_{AC), (1-Z BC} ), (1-K A) and (1-K _B)
Performs shaping of the video signal V _C of the image C by using a.

The mixer 531 is connected to the terminal T ₁ of the complementary circuit 21.
The terminal 1 outputs the complementary signal (1-Z _AC ) output from the terminal 5 to the constant “1” output from the constant generator 205, and the terminal T _2
3 , the complementary signal (1-
K _A ) are input, and the signal {(1-Z _AC ) + Z _{AC .multidot.} (1-K _A )} is multiplied by the multiplier 533 according to the above equation (5).
Output to

The mixer 532 is connected to the terminal T ₁ of the complementary circuit 21.
The outputted complementary signals (1-Z _BC) from 6, output from the constant generator 206 to the terminal T ₂ the constant "1", the terminal T
₃ , the complementary signal (1-
Z _BC) was inputted, (5) signal according to formula _{{(1-Z BC) +} Z BC · (1-K B)} of the multiplier 533
Output to

The multiplier 533 outputs the output signal {(1−Z _AC ) + Z _AC · (1−K _A )} of the mixer 531 to the mixer 522.
The output signal _{{(1-Z BC) +} Z BC · (1-K B)} and by multiplying the signal _{[{(1-Z AC)} + Z AC · (1-
K _A)} · {(outputs to _{1-Z BC) + Z BC} · (1-K B)}] of the multiplier 534. The multiplier 534 includes the multiplier 52
3 [{(1-Z _AC ) + Z _AC. (1-K _A )}}
_{· {(1-Z BC)} + Z BC · (1-K B)}] and by multiplying the key signal K _C of the image C, the signal _{[{(1-Z AC)} + Z
_AC・ (1-K _A )｝ ・ ｛(1-Z _BC ) + Z _BC・ (1-K
_B )｝] · K _C is output to the multiplier 535. Multiplier 53
5 is an output signal of the multiplier 534 [｛(1-Z _AC ) + Z _AC
・ (1-K _A )｝ ・ ｛(1-Z _BC ) + Z _BC・ (1-
K _B)}] · K _C and by multiplying the video signal V _C of the image C, the third is the output of the video signal shaping circuit 53 shapes the video signal MV _C shaping video signal adding circuit shown in below 6
Output to 0. _{MV C = [{(1-} Z AC) + Z AC · (1-K A)} · {(1-Z BC) + Z BC · (1-K B)}] · K C · V C

The shaped video signal adding circuit 60 includes an adder 6
01 and 602. Adder 601
Receives the output signal MV _A of the first video signal shaping circuit 51 and the output signal MV _B of the second video signal shaping circuit 52 adds the adder 60 a signal (MV _A + MV _B) shown below
Output to 2. _{(MV A + MV B) =} [{Z AB + (1-Z AB) · (1-K B)} · {Z AC + (1-Z AC) · (1-K C)} · K A · V _{A + {(1-Z AB} ) + Z AB · (1- K A)} · {Z BC + (1-Z BC) · (1-K C) · K B · V B]

The adder 602 adds the output signal MV _C of the output signal (MV _A + MV _B) and the third video signal shaping circuitry 53 of the adder 601, the signal shown below (MV _A +
MV _B + MV _C ) to the composite video signal generation circuit 70. _{(MV A + MV B + MV} C) = [{Z AB + (1-Z AB) · (1-K B)} · {Z AC + (1-Z AC) · (1-K C)} · K A _{· V A + {(1-} Z AB) + Z AB · (1- K A)} · {Z BC + (1-Z BC) · (1-K C)} · K B · V B + {(1 −Z _AC ) + Z _AC · (1-K _A )｝ · {(1-Z _BC ) + Z _BC · (1-KB) _B · K _C · V _C ]

The composite video signal generating circuit 70 is constituted by a multiplier, shaping the video signal output signal of the addition circuit _{60 (MV A + MV B +} MV C) and synthetic key inverse signal output signal generating circuit 40 (1 / K _BG ) To output a composite video signal V _{O in} which the background is not mixed as shown below. _{V O = [{Z AB +} (1-Z AB) · (1-K B)} · {Z AC + (1-Z AC) · (1-K C)} · K A · V A + {( _{1-Z AB) + Z AB} · (1-K A)} · {Z BC + (1-Z BC) · (1-K C)} · K B · V B + {(1-Z AC) + Z AC _{· (1-K A)}} · {(1-Z BC) + Z BC · (1-K B)} · K C · V C] × 1 / [{1- (1-K A) · (1- _{K B) · (1 -K C} )}]

A composite video signal generating circuit 8 with a background
0 is composed of a mixer based on the above equation (5), the composite key signal K _BG output from the composite key signal generation circuit 30 at the terminal T ₁ and the composite key signal K _BG output from the composite video signal generation circuit 70 at the terminal T _2. composite video signal V _O, the background video signal V _BG were input to the terminal T _3, composite video signal with the background shown below V _OBG Is output. _{V OBG = [{Z AB +} (1-Z AB) · (1-K B)} ·
{Z _AC + (1-Z _AC ) ・ (1-K _C )} ・ K _A・ V _A +
{(1-Z _AB ) + Z _AB. (1-K _A )}. {Z _BC + (1
_{-Z BC) · (1-K} C)} · K B · V B + {(1-
Z _AC ) + Z _AC・ (1-K _A )｝ ・ {(1-Z _BC ) + Z _{BC
· (1-K B)}} · K C · V C] + (1-K A) · (1
_{-K B) · (1-K} C) · V BG

FIG. 3 shows three images A,
7 shows waveform examples of key signals K _A , K _B , K _C and priority signals Z _AB , Z _AC , Z _BC when B and C are combined. The key signals K _A , K _B , K _C are 0 ≦ K _A , K _B ,
The condition of K _C ≦ 1 is satisfied, and this value changes for each pixel. The closer the value of each of the key signals K _A , K _B , and K _C is to “1”, the higher the contribution ratio of each of the images A, B, and C in the composite image is, and the image of the key signal “1” is included in the composite image. 100
%, And the image below or after that image is completely invisible. On the other hand, as the value of the key signal is closer to “0”, the contribution ratio of each of the images A, B, and C in the composite image decreases, and the image with the key signal “0” is not displayed at all in the composite image.

The priority signals Z _AB , Z _AC , and Z _BC also satisfy the condition of 0 ≦ Z _AB , Z _AC , Z _BC ≦ 1 similarly to the key signals, and as described above, the priority signals Z _AB , Z _AC , and Z _BC ≦ 1.
When the values of Z _AC and Z _BC are “1”, it indicates that the preceding suffix of the two suffixes of the symbol Z, that is, the image of “A” or “B” is on or before. On the other hand, when the values of the priority signals Z _AB , Z _AC , and Z _BC are “0”, the following suffixes of the two suffixes of the code Z, that is, the images of “B” and “C” are positioned above or before. Indicates that there is. In the areas X _BC , X _AC , and X _AB where two images intersect, the priority signals Z _AB , Z _AC , and Z _BC take the value “0.5”. As a result, the intersection areas X _BC , X _AC , and X _AB are shaped so as to be smooth.

Next, the operation of the above configuration will be described. Video signal for the image A V _A, the key signal K _A, the depth signal Z
Image signal comprising a _A, the video signal V _B for the image B, the key signal K _B, the depth signal Z video signal V _C of the video signal and the image C consisting of _B, the key signal K _C, the depth signal Z _C
Are input to the apparatus, the video signals V _A , V _B , and V _C are converted into a first video signal shaping circuit 51, a second video signal shaping circuit 52, and a third video signal shaping circuit, respectively. 53, and the key signals K _A , K _B , K _C
Are input to the complementary circuits 211, 212, and 213, respectively, and the depth signals Z _A , Z _B , and Z _C are input to the priority signal generation circuit 10, respectively.

In the priority signal generation circuit 10, the priority determination circuit 101 performs the depth signal Z _A
Weighting in the composite image of the images A and B by using the Z _B is performed with priority signal Z _AB in accordance with this
Is generated and output to the terminal T ₁ of the mixer 511 of the first video signal shaping circuit 51 and the complementary circuit 214.
Further, in the priority judging circuit 102, weighted in the composite image of the images A and C is performed by using the depth signal Z _A and Z _C, the priority signal Z _AC corresponding thereto is generated, the first video Signal shaping circuit 51
Are output to the terminal T ₁ of the mixer 512 and the complementary circuit 215. Further, in the priority judging circuit 103, weighted in the composite image of the image B and image C is performed by using the depth signal Z _B and Z _C, the priority signal Z _BC corresponding thereto is generated, the second video Terminal T ₁ of mixer 522 of signal shaping circuit 52 and complementary circuit 2
16 is output.

[0050] In the complementary circuit 211, a complementary signal of the key signal K _A (1-K _A) is generated, the complementary signals (1-
K _A ) is the mixer 521 of the second video signal shaping circuit 52.
T ₃ and the multiplier ₃ of the composite key signal generation circuit 30
01 is output. The complementary circuit 212, a key signal K _B
Complementary signal (1-K _B) is generated, the complementary signal (1
-K _B) is a mixer 51 of the first video signal shaping circuit 51
The signal is output to the terminal T _{3 of} 1 and the multiplier 301 of the composite key signal generation circuit 30. In the complementary circuit 213, the key signal K
_C complementary signals (1-K _C) are generated, the complementary signal (1-K _C) is a multiplier of terminals T ₃ and synthesis key signal generating circuit 30 of the mixer 512 of the first video signal shaping circuit 51 It is output to 302.

In the complementary circuit 214, a complementary signal (1-Z _AB ) of the priority signal Z _AB is generated, and the complementary signal (1-Z _AB ) is supplied to the mixer 511 of the second video signal shaping circuit 52. is output to the terminal T _1. Complementary circuit 215
Then, the complementary signal of the priority signal Z _AC (1-Z _AC )
Is generated, and this complementary signal (1-Z _AC ) is output to the terminal T ₁ of the mixer 531 of the third video signal shaping circuit 53. The complementary circuit 216, a complementary signal of the priority signal Z _BC (1-Z _BC) are generated, the complementary signal (1-Z
_BC ) is output to the terminal T ₁ of the mixer 532 of the third video signal shaping circuit 53.

In the composite key signal generation circuit 30, the multiplier 3
01 by the complementary signal (1-K _A) and the (1-K _B) is multiplied further the multiplied signal by the multiplier _{302 (1-K A) ·} (1-K B) to the complementary signal (1 −
K _C ) are multiplied. Next, in the complementary circuit 303, the output signal (1-K _A ) · (1-
K _B ) · (1−K _C ) is subtracted from “1” to generate a composite key signal K _BG , and the composite key reciprocal signal generation circuit 40
Is output to In the composite key reciprocal signal generation circuit 40, the reciprocal “1 / K _BG ” of the composite key signal K _BG is obtained and output to the composite video signal generation circuit 70 as a composite key reciprocal signal.

On the other hand, in the first video signal shaping circuit 51, in the mixers 511 and 512, the aforementioned (5)
The mixing process of the input signal is performed according to the equation, and the mixer 511
Signal from _{{Z AB + (1-Z} AB) · (1-K B)} is output from the mixer 512 signal _{{Z AC + (1-Z} AC) +
(1-K _C )} is output. Mixers 511 and 51
2 of the output signal is multiplied in a multiplier 513, further multiplier 514 by the key signal K _A is, the multiplier 515 is multiplied video signal V _A, the signal MV _A which is prepped
Is output to the adder 601 of the shaped video signal addition circuit 60.

Similarly, in the second video signal shaping circuit 52, in the mixers 521 and 522, (5)
The mixing process of the input signal is performed according to the equation, and the mixer 521
Outputs a signal ｛(1−Z _AB ) + Z _AB · (1−K _A ), and a signal ５２Z _BC + (1−Z _BC ) ·
(1-K _C )} is output. Mixers 521 and 52
2 of the output signal is multiplied in a multiplier 523, further key signal K _B in a multiplier 524, the multiplier 525 is multiplied video signal V _B, the shaping process signal MV _B
Is output to the adder 601 of the shaped video signal addition circuit 60.

Similarly, in the third video signal shaping circuit 53, in the mixers 531 and 532, (5)
The mixing process of the input signal is performed according to the equation, and the mixer 531
Outputs a signal {(1-Z _AC ) + Z _AC. (1-K _A )}, and a signal {(1-Z _BC ) + Z _BC.
(1-K _B)} is output. Mixers 531 and 53
2 of the output signal is multiplied in a multiplier 533, further multiplier 534 by the key signal K _C is, the multiplier 535 video signal V _C is multiplied by the signal MV _C which is prepped
Is output to the adder 602 of the shaped video signal addition circuit 60.

[0056] In shaping video signal adding circuit 60, the adder 601, the output signal MV _A of the first video signal shaping circuit 51 and the output signal MV _B of the second video signal shaping circuit 52 are added, further added in vessels 602 and an output signal MV _C of the addition signal (MV _a + MV _B) and the third video signal shaping circuit 53 is added, the signal (MV _a +
MV _B + MV _C ) is output to the composite video signal generation circuit 70.

In the composite video signal generation circuit 70, the output signal (MV _A + MV _B + MV) of the shaped video signal addition circuit 60
_C ) and the composite key reciprocal signal (1 / K _BG ) by the composite key reciprocal signal generation circuit 40 are multiplied. This allows
The following composite video signal V _O without the background of the three images A, B, and C is output. _{V O = (MV A + MV} B + MV C) · (1 / K BG) = [{Z AB + (1-Z AB) · (1-K B)} · {Z AC + (1-Z AC) · _{(1-K C)} ·} K A · V A + {(1-Z AB) + Z AB · (1-K A)} · {Z BC + (1-Z BC) · (1-K C)} _{· K B · V B + {} (1-Z AC) + Z AC · (1-K A)} · {(1-Z BC) + Z BC · (1-K B)} · K C · V C] × 1 / [{1- (1- K A) · (1-K B) · (1 -K C)}]

When a background is added to a composite video, a composite video signal generation circuit with background 8
0 mixer synthesis key signal K _BG terminal T ₁ of the constituting a is input, composite video signal V _O generated by composite video signal generating circuit 70 to the terminal T ₂ is input to the terminal T ₃ of the background The video signal V _BG is input, and the following composite video signal V _OBG with _background is generated and output. _{V OBG = K BG · V O} + (1-K BG) · V BG [{Z AB + (1-Z AB) · (1-K B)} · {Z AC + (1-Z AC) · ( _{1-K C)} · K} A · V A + {(1-Z AB) + Z AB · (1-K A)} · {Z BC + (1-Z BC) · (1-K C)} · _{K B · V B + {(} 1-Z AC) + Z AC · (1-K A)} · {(1-Z BC) + Z BC · (1-K B)} · K C · V C] + ( _{1-K A) · (1} -K B) · (1-K C) · V BG

As described above, according to the present embodiment,
Instead of sequentially synthesizing three video signals two by two as in the prior art, three video signals are simultaneously synthesized. Therefore, when three video signals are synthesized, a smooth edge and intersection area can be obtained. And an image without an unnatural image can be obtained.

Although the present embodiment has been described by taking as an example the case where there are three video signals to be synthesized, the present invention can be applied to the case where four or more video signals are synthesized, and the same effects as described above are obtained. Needless to say, the effect of (1) is obtained.

[0061]

As described above, according to the present invention,
When three or more video signals are combined, a smooth edge and an intersecting region can be obtained, and an image without an unnatural image can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a video signal synthesizing apparatus according to the present invention.

FIG. 2 is a diagram for explaining an operation principle of a mixer in the video signal synthesizing device of FIG.

FIG. 3 is a diagram illustrating waveform examples of a key signal and a priority signal when three images that intersect each other are synthesized.

FIG. 4 is a diagram showing a basic configuration of a conventional three-channel DME combiner.

FIG. 5 is a diagram for explaining basic edge processing in a combining operation of a two-channel combiner when two planes intersect;

FIG. 6 is a diagram showing an example of arrangement of three images.

FIG. 7 is a diagram illustrating an example of a synthesis order of video signals of three images.

FIG. 8 is a diagram for explaining a problem of a conventional three-channel DME combiner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Priority signal generation circuit 101, 102, 103 ... Priority judgment circuit 20 ... Constant generation and complementary circuit 201-206 ... Constant generator 211-216 ... Complementary circuit 30 ... Synthetic key signal generation circuit 301, 302 ... Multiplier 303 ... Complementary circuit 40 Synthesized key reciprocal signal generation circuit 51 First video signal shaping circuit 511, 512 Mixer 513-515 Multiplier 52 Second video signal shaping circuit 521, 522 Mixer 523-525 Multiplier 53 Third video signal shaping circuit 531 532 Mixer 533-535 Multiplier 60 Shaped video signal adding circuit 601, 602 Adder 70 Synthesized video signal generating circuit 80 Synthesized video with background Signal generation circuit

Claims (3)

(57) [Claims] 1. A video signal synthesizing device for synthesizing at least a first video signal, a second video signal and a third video signal comprising a video signal, a key signal and a depth signal. A circuit that generates a priority signal by performing weighting in the depth direction between them, a circuit that generates a complementary signal of each key signal, a circuit that generates a complementary signal of each priority signal, and multiplies all of the complementary key signals A circuit for outputting a complementary signal of the multiplied signal as a composite key signal; a circuit for performing a reciprocal operation of the composite key signal and outputting as a composite key reciprocal signal; and a priority related to the first and second video signals. Signal
Complementary key signal of complementary signal and key signal related to second video signal
Of the first and second video signals.
The result of adding the priority signals and the first and third
The complementary signal of the priority signal related to the video signal and the third signal
The result of multiplying the complementary key signal of the key signal related to the video signal
Priority signals related to the first and third video signals
Is added to the key signal and the first video signal.
The first video signal by multiplying the
A first shaping circuit for shaping a video signal, and a priority signal related to the first and second video signals.
Multiplying a complementary key signal of the key signal relating to the first video signal
Of the prioritization of the first and second video signals
The result of adding the complementary signal of the
The complementary signal of the priority signal related to the video signal and the third signal
The result of multiplying the complementary key signal of the key signal related to the video signal
Priority signals related to the second and third video signals
Is added to the key signal and the second video signal.
The second video signal by multiplying the
A second shaping circuit for shaping a video signal, and a priority signal relating to the first and third video signals.
Multiplying a complementary key signal of the key signal relating to the first video signal
Of the prioritization of the first and third video signals
The result of adding the complementary signal of the
The priority signal for the video signal and the second video signal
The result of multiplying the complementary key signal of the key signal by the second
Complementary signal of the priority signal and the third video signal
A result of adding the key signal according to a third video signal Oyo
The third video signal by multiplying the
A third shaping circuit for shaping a video signal, a circuit for adding the video signals shaped by the first, second, and third shaping circuits; and a reciprocal of the added video signal and the composite key. A circuit for multiplying the signal to generate a composite video signal. 2. The video according to claim 1, further comprising a circuit for adding a signal obtained by multiplying the added video signal by a complementary signal of the synthesized key signal and a video signal of a background to generate a synthesized video signal with a background. Signal synthesizer. 3. The video signal synthesizing apparatus according to claim 1, wherein each of the processes is performed for each pixel.