JPH04337994A - System for transmitting television signal - Google Patents

Abstract

PURPOSE:To correctly reproduce luminance or chromacity on the side of a receiver even when R, G and B signals with vivid colors and luminance signals having high frequency components are inputted to the side of a transmitter. CONSTITUTION:A transmitter 1 generates the luminance signals and chrominance signals from the R, G and B signals and based on these luminance signals and chrominance signals, the signals to be reproduced on the side of a receiver 2 are calculated. The processing of correcting the luminance signals and the chrominance signals corresponding to difference between these calculated signals and the R, G and B signals is executed plural times, and the luminance signals and the chrominance signals obtained by this correcting operation are supplied to the side of the receiver 2 as transmitted signals.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the transmission of television signals, and more particularly to a television signal transmission system in which a correction signal is added to the transmitted signal to reproduce correct brightness and color on the receiving side.

[Summary of the Invention] The present invention provides R
A luminance signal and a chrominance signal are generated from the R signal, G signal, and B signal, and a signal to be reproduced on the receiver side is calculated based on these luminance signal and chrominance signal.
the luminance signal according to the difference between the signal, the G signal, and the B signal;
By performing color signal correction processing multiple times and supplying the luminance signal and color signal obtained by this correction operation to the receiver side as transmission signals, the image transmitter side can have vivid colors and brightness. To correctly reproduce brightness and chromaticity on a receiver side even when R, G, and B signals having high frequency components are input.

0004

2. Description of the Related Art A system shown in FIG. 27 is conventionally known as a television system.

The television system shown in this figure includes an image transmitter 101 and a receiver 102, and displays an R-light image,
When a G light image and a B light image are supplied, the image transmitter 101 generates a luminance signal Y' and color signals C1L' and C2L' from the R light image, G light image, and B light image, and The signals are supplied to the receiver 102 to generate R', G', and B' signals corresponding to the R, G, and B light images, thereby displaying an RGB screen.

[0006] The image transmitter 101 includes three photo/electrical converters 100.
, three gamma correction circuits 103, a matrix circuit 104, and two low-pass filters 105. When an R light image, a G light image, and a B light image are supplied,
A luminance signal Y' and color signals C1L' and C2L' are generated from the R light image, G light image, and B light image, and are sent to the receiver 1.
Supply to 02.

Each photo/electrical converter 100 receives an R light image, a G light image, and a G light image.
When an optical image and a B optical image are supplied, they are photo/electrically converted to generate an R signal, a G signal, and a B signal, and these are supplied to each of the gamma correction circuits 103, respectively.

Each inverse gamma correction circuit 103 performs inverse gamma correction on the R signal, G signal, and B signal outputted from each of the photo/electrical converters 100, respectively, to obtain an R' signal,
G' signal and B' signal are generated and sent to matrix circuit 1.
Supply on 04.

When the R' signal, G' signal, and B' signal are output from each of the gamma correction circuits 103, the matrix circuit 104 processes these signals into a luminance signal Y.
' is generated and supplied to the receiver 102 as a transmission signal, and color signals C1' and C2' are generated and supplied to each low-pass filter 105, respectively.

When the respective color signals C1' and C2' are outputted from the matrix circuit 104, each low-pass filter 105 receives the respective color signals C1' and C2'.
The color signals C1L' and C2L' are generated by cutting the high frequency components of the color signals C1L' and C2L', and these are supplied to the receiver 102 as transmission signals.

The receiver 102 includes a matrix circuit 106 and a CRT 107, and receives a luminance signal Y' output from the image transmitter 101 and two color signals C1L' and C2.
R', G', and B' signals corresponding to the R, G, and B signals of the image transmitter 101 are generated based on the R', G', and B' signals, and an RGB screen is displayed on the CRT 107.

The matrix circuit 106 is connected to the image transmitter 10.
1 to luminance signal Y' and two color signals C1L' and C2L'
is output, the luminance signal Y' and the two color signals C1L' and C2L' are subjected to inverse matrix processing to obtain the R' signal, G' signal, and B signal corresponding to the R signal, G signal, and B signal. 'Generate a signal and supply it to the CRT 107.

[0013] The CRT 107 is connected to the matrix circuit 10.
When the R' signal, G' signal, and B' signal are output from 6, an RGB screen based on these is displayed.

As described above, in this television system, by giving a wide frequency band to the luminance signal Y' and narrowing the frequency bands to the color signals C1L' and C2L', the aforementioned transmission can be performed while performing efficient transmission. An RGB screen corresponding to the R light image, G light image, and B light image input to the imager 101 is displayed on the CRT 107 of the receiver 102.

[0015]

However, the conventional television system described above has the following problems.

Now, to simplify the explanation, R signal, G signal
A conversion equation for generating an R' signal, a G' signal, and a B' signal from the B signal and an inverse gamma correction equation for the luminance signal Y' are set as shown in the following equation.

Y=0.3・R+0.6・G+0.1・B
...(1)
C1 = (RY)/1.4 =0.5・R-0.42・G-0.0
71・B…(2)C
2 = (B-Y)/1.8 =0.167・R-0.33・G+0
．． 5.B...(3)Y
'=Y0.45

...(4) Under such conditions, when R, G, and B signals with high saturation and containing high frequency components are output from each optical/electrical converter 100 of the image transmitter 101, for example, as shown in FIG. With the G signal and B signal held at zero,
When only the R signal changes in a pulse-like manner at a high frequency, and the luminance component changes in a corresponding pulse-like manner, each gamma correction circuit 103 outputs the R' signal, G' signal, and B signal shown in FIG. 29(a). 'The signals are outputted from the matrix circuit 104, and the luminance signal Y', the color signal C1', shown in FIG. 29(b),
C2' is output. And each low pass filter 1
05 to color signals C1L' and C2L' shown in FIG. 29(c)
are output, and these color signals C1L', C2L' and the luminance signal Yr output from the matrix circuit 104 are
' is supplied to the receiver 102 as a transmission signal, and the R' signal and G' shown in FIG. 29(d) are supplied from the matrix circuit 106.
The R' signal and the B' signal are output, and the R' signal is outputted on the CRT 107.
An RGB screen shown in FIG. 29(e) in which the negative components of the signal, G' signal, and B' signal are clipped to zero is displayed.

In this case, the optical output R shown in FIG. 29(e)
As is clear from the component, G component, B component, and luminance component, the color saturation and resolution of the RGB screen displayed on the CRT 107 are reduced.

[0019] Therefore, as a method to solve such problems, a television system shown in Fig. 30 has been considered (TV Society Journal Vol. 43, No. 7 (1989),
pp723-730 Compensation method for resolution reduction of high chroma image quality in EDTV system). In this figure, the same parts as those shown in FIG. 27 are given the same reference numerals.

The television system shown in this figure is shown in FIG.
The difference from the television system shown in 7 is the image transmitter 10.
A correction signal generation section 110 and an adder 111 are provided in the receiver 102 to output a corrected luminance signal Y' from the image transmitter 101 to improve the luminance components of the RGB screen reproduced on the receiver 102 side. That's what I did.

The correction signal generating section 110 receives the R signal and G signal output from each optical/electrical converter 100 as shown in FIG.
a matrix circuit 112 that performs matrix processing on the B signal; a gamma correction circuit 113 that performs gamma correction on the luminance signal Y output from the matrix circuit 112;
Luminance signal Y' output from this gamma correction circuit 113
and the luminance signal Y' output from the matrix circuit 104
A comparator 114 generates a signal according to the difference between the two and a difference signal SY output from the comparator 114.
High pass filter (HPF) that cuts low frequency components of
) 115 and a coefficient unit 116 that generates a correction signal SYH by multiplying the difference signal SYH output from the high-pass filter 115 by a preset coefficient, and R signal, G signal, B
A correction signal SYH is generated based on the signal and the luminance signal Y' output from the matrix circuit 104 and is supplied to the adder 111.

The adder 111 is connected to the correction signal generating section 110.
The correction signal SYH output from the coefficient unit 116 is added to the luminance signal Y' output from the matrix circuit 104, and the luminance signal Y' obtained by this addition operation is supplied to the receiver 102 as a transmission signal.

Here, to simplify the explanation, matrix processing is performed on the image transmitter 101 side using the following equation,

[0024]

[Math 1]

On the receiver 102 side, inverse matrix processing is performed using the following equation,

[0026]

[Math 2]

Furthermore, gamma correction is performed using the following equation, γ(X)=X0.5

(7) Inverse gamma correction is performed using the following equation.

γ−1(X)=X2

...(8) Under these conditions, Figure 32(a)
If the R signal, G signal, and B signal forming a red and black striped pattern are outputted from each optical/electrical converter 100 of the image transmitter 101 as shown in FIG. 32(b), the luminance shown in FIG. The signal Y', the color signals (B-Y)' and (RY)' are output, and the gamma correction circuit 113 outputs the signals shown in FIG.
A luminance signal Y' shown in c) is output, and a difference signal SYH shown in FIG. 32(d) is output from the high-pass filter 115 according to the difference between them.

Then, the coefficient of the coefficient multiplier 116 is set to "1.4".
32(e) as a transmission signal from the image transmitter 101.
), the luminance signal Y', the color signal (B-Y)L', (R-
Y)L' is output, and this is supplied to the receiver 102, and the matrix circuit 106 outputs R' shown in FIG. 32(f).
A signal, a G' signal, and a B' signal are output, and an RGB screen having an R component, a G component, a B component, and a luminance component shown in FIG. 32(g) is displayed on the CRT 107.

In this case, the optical output R shown in FIG. 32(g)
As is clear from the component, G component, B component, and luminance component, this television system can approximately correctly reproduce the luminance component Y of the RGB screen displayed on the CRT 107, but cannot reproduce the color component correctly. The problem is that I can't.

Furthermore, in such a television system, as shown in FIG. 33(a), each optical/electrical converter 100
An R signal with vivid colors and a luminance signal containing high frequency components,
When the G signal and B signal are output, matrix circuit 1
04 to the luminance signal Y' and color signal (B) shown in FIG. 33(b).
-Y)' and (RY)' are output, and the gamma correction circuit 113 outputs the luminance signal Y' shown in FIG. 33(c), and the high-pass filter 115
A difference signal SYH shown in FIG. 33(d) is outputted from this.

[0032] As a result, the luminance signal Y' and the color signal (B-
Y)L' and (RY)L' are output, which is supplied to the receiver 102 and sent from the matrix circuit 106 as shown in FIG.
The R' signal, G' signal, and B' signal shown in FIG. 3(f) are output, and an RGB screen having the R component, G component, B component, and luminance component shown in FIG. 33(g) is displayed on the CRT 107. Ru.

In this case, the optical output R shown in FIG. 33(g)
As is clear from the components, G component, B component, and luminance component, not only the color components of the RGB screen displayed on the CRT 107 but also the luminance component Y cannot be correctly reproduced.

[0034] In view of the above-mentioned circumstances, the present invention aims to correctly reproduce the brightness and chromaticity on the receiver side even if an RGB signal with vivid colors and a luminance signal having high frequency components is input to the image transmitter side. The purpose is to provide a television signal transmission system that allows for

[Configuration of the invention]

[0036]

[Means for Solving the Problems] In order to achieve the above object, a television signal transmission system according to the present invention generates a luminance signal and a chrominance signal from an R signal, a G signal, and a B signal on the transmitter side. The receiver side receives the luminance signal and the color signal and reproduces an RGB screen corresponding to the R signal, G signal, and B signal from the luminance signal and the color signal. In the television signal transmission system, the image transmitter generates a brightness signal and a color signal from the input R signal, G signal, and B signal, and transmits the image to the receiver based on these brightness signals and color signals. The signal reproduced on the side is calculated, and the process of correcting the luminance signal and the color signal is performed multiple times according to the difference between this signal and the R signal, G signal, and B signal. It is characterized in that the luminance signal and color signal thus obtained are supplied to the receiver side as transmission signals.

[0037]

[Operation] In the above configuration, the R signal is transmitted by the image transmitter.
A luminance signal and a chrominance signal are generated from the G signal and the B signal, and a signal to be reproduced on the receiver side is calculated from these luminance signals and the chrominance signal.
The process of correcting the luminance signal and the color signal according to the difference between the signal and the B signal is performed multiple times, and the luminance signal and color signal obtained by this correction operation are transmitted as transmission signals to the receiver side. supplied to

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of a television system using a first embodiment of the television signal transmission system according to the present invention.

The television system shown in this figure includes an image transmitter 1 and a receiver 2, and when an R light image, a G light image, and a B light image are supplied, the image transmitter 1
Luminance signal Y' and color signals (B-Y)L', (R-Y)L, which are the basis of the transmission signal from the optical image, G optical image, and B optical image
', and also generates the R light image, the G light image, and the B light image.
A brightness signal Y and color signals (B-Y)L, (R-Y)L are generated to reproduce a correct RGB screen from an optical image, and the brightness signal Y and color signals (B-Y)L, (R- Y)L
Based on the luminance signal Y' and the color signal (B-Y)L'
, (RY)L' are corrected, and then supplied to the receiver 2 side to output the R' signal, G' signal, and B' signal corresponding to the R light image, G light image, and B light image. to generate the correct R
Display the GB screen.

The image transmitter 1 includes three optical/electrical converters 3, a transmission signal generation section 4, a reproduced signal generation section 5, and a plurality of correction sections 6a to 6n connected in cascade. Luminance signal Y' and color signals (B-Y)L', (R-Y)L' which are the basis of the transmission signal from the R light image, G light image, and B light image
After generating a luminance signal Y and color signals (B-Y)L and (R-Y)L for reproducing a correct RGB screen from the R light image, G light image, and B light image,
This luminance signal Y and color signals (B-Y)L, (R-Y)L
Based on the luminance signal Y' and the color signal (B-Y)L
', (RY)L' and the luminance signal Y' and color signal (B-Y)L', (R-
Y)L' is supplied to the receiver 2 side.

[0041] The three photo/electrical converters 3 each receive an R light image, a G light image, and a G light image.
When a light image and a B light image are supplied, they are converted into light/B light images, respectively.
The signal is electrically converted to generate an R signal, a G signal, and a B signal, which are supplied to a transmission signal generation section 4 and a reproduction signal generation section 5.

As shown in FIG. 2, when the R signal, G signal, and B signal are output from each of the photo/electrical converters 3, the reproduced signal generating section 5 performs matrix processing on these signals to generate a luminance signal Y, a color signal ( A matrix circuit 7 that generates color signals (B-Y) and (R-Y), and a color signal (B-Y) from this matrix circuit 7.
, (RY), each of these color signals (B
-Y) and (RY), respectively, to generate color signals (B-Y)L and (RY)L, and each of the above-mentioned light When the R signal, G signal, and B signal are output from the /electrical converter 3, these are processed to produce a luminance signal Y and a color signal (B-Y )L
, (RY)L are generated and supplied to the first stage correction section 6a.

[0043] Furthermore, when the R signal, G signal, and B signal are output from each of the optical/electrical converters 3, the transmission signal generating section 4 generates
Three gamma correction circuits 9 that perform gamma correction for each of these.
Then, the R' signal, G' signal, and B' signal outputted from each gamma correction circuit 9 are subjected to matrix processing to produce a luminance signal Y', chrominance signal (B-Y)', and (R-Y)'. The matrix circuit 10 that generates the color signals (B-Y)L', (R-Y) by cutting high frequency components of the color signals (B-Y)', (R-Y)' output from the matrix circuit 10 Y
) L', and the R signal, G signal,
When the B signal is output, these are processed to produce the luminance signal Y', color signal (B-Y)L', (R
-Y) L' is generated and supplied to the first stage correction section 6a.

The first stage correction section 6a includes a local decoder 12, a correction signal generation section 13, and a signal correction section 14 as shown in FIG. Y, color signal (B-Y)L, (R-Y)
L is taken in and supplied to the second stage correction section 6b, and the luminance signal Y, color signal (B-Y) L, (
R-Y)L, the luminance signal Y' output from the transmission signal generation section 4, the color signal (B-Y)L', (R-Y)L
' Based on the brightness correction signal SY, color correction signal S (
B-Y), S(R-Y) while generating these brightness correction signals SY, color correction signals S(B-Y), S(
Luminance signal Y', color signal (B-Y) L', (R-Y) output from the transmission signal generation section 4 based on
) L' is corrected and supplied to the second stage correction section 6b.

The local decoder 12 receives the luminance signal Y' and the color signal (B-Y) L output from the transmission signal generation section 4.
', (RY)L' by inverse matrix processing and R'
A matrix circuit 15 that generates a signal, a G' signal, and a B' signal, and an R' output from this matrix circuit 15.
Inverse gamma correction for each signal, G' signal, and B' signal 3
The two inverse gamma correction circuits 16 perform matrix processing on the R signal, G signal, and B signal output from each of these inverse gamma correction circuits 16 to produce luminance signal Y, color signal (B-Y), and (R
-Y), and a matrix circuit 17 that generates color signals (B-Y) and (R
-Y), and cut the high frequency components of the color signal (B-Y).
)L, (RY)L, and two low-pass filters 18 that generate luminance signal Y', color signal (B-Y)L', (R −
Y) Luminance signal Y' and chrominance signal (B-Y) L' which are outputted from the transmission signal generation unit 4 after sequentially performing inverse matrix processing, inverse gamma correction processing, matrix processing, and low-pass filtering processing on L'. , (RY)L' is supplied to the receiver 2 as a transmission signal.
GB screen luminance signal Y, color signal (B-Y)L, (R-
Y)L, and the luminance signal Y and color signals (B-Y)L, (RY)L obtained by this estimation operation are supplied to the correction signal generation section 13.

The correction signal generation unit 13 receives the luminance signal Y and color signal (B-Y) L output from the local decoder 12.
, (RY)L, the luminance signal Y output from the reproduction signal generation section 5, and the color signal (B-Y)L, (R-Y).
The luminance signal Y output from the local decoder 12 is provided with three comparators 19 for comparing the luminance signal Y
, color signals (B-Y)L, (R-Y)L, a luminance signal Y output from the reproduction signal generation section 5, and a color signal (B-Y)L.
Y)L and (RY)L are compared, and a brightness correction signal SY and a color correction signal S(B-Y
), S(RY) and send it to the signal correction unit 14.
supply to.

The signal correction unit 14 outputs the luminance signal Y', the color signal (B-Y)L', and
(RY)L', the brightness correction signal SY output from the correction signal generation section 13, and the color correction signal S(B-Y)
, S(RY), respectively.
The luminance signal Y', the color signal (B-Y)L', (R-Y)L output from the transmission signal generation section 4
', the brightness correction signal SY output from the correction signal generation section 13, the color correction signal S(B-Y), S(R-Y)
The luminance signal Y', the color signal (B-Y)L', (R-Y
)L' and the luminance signal Y', color signal (B-Y)L', (R-Y)L' obtained by this correction operation.
is supplied to the second stage correction section 6b.

Each of the second-stage correction section 6b to the final-stage correction section 6n has the same structure as the first-stage correction section 6a, and the luminance signal Y output from the first-stage correction section 6a.
, color signals (B-Y)L, (R-Y)L and sequentially supply them to the next correction section, and the luminance signal Y, color signals (B-Y)L, (R-Y )L and 1
A brightness correction signal SY and a color correction signal S(B-Y) are generated based on the brightness signal Y', color signals (B-Y)L', and (RY)L' output from the correction section 6a of the first stage. , S(R-
Y) to generate the luminance signal Y' and the color signal (B-Y).
L', (RY)L' are sequentially corrected and sequentially supplied to the next correction section, and the luminance signal Y' and color signal (B-Y)L' obtained by the final stage correction section 6n are obtained. , (RY)L
' is supplied to the receiver 2 as a corrected transmission signal.

The receiver 2 is equipped with a matrix circuit 21 and a CRT 22 as shown in FIG.
', (RY)L', the R light image, G
R' signal, G' signal, B' corresponding to optical image, B optical image
A signal is generated to display an RGB screen on the CRT 22.

The matrix circuit 21 receives a luminance signal Y' and two color signals (B-Y)L', (R-
Y)L' are output, these luminance signals Y',
The color signals (B-Y)L' and (R-Y)L' are subjected to inverse matrix processing to obtain R', G', and B' signals corresponding to the R, G, and B light images. Generate this in C
Supplied to RT22.

[0051] When the R' signal, G' signal, and B' signal are output from the matrix circuit 21, the CRT 22 displays an RGB screen based on these signals.

Next, the operation of this embodiment will be explained with reference to the schematic diagrams shown in FIGS. 4 to 11. In addition, in the following explanation, in order to simplify the explanation, the correction unit 6a
The number of ~6n is set to three.

First, the image feeder 1 receives an R light image, a G light image, and a B light image.
When an optical image is input and each optical/electrical converter 3 outputs an R signal, a G signal, and a B signal showing the red and black striped pattern shown in FIG. the R signal;
The G signal and B signal are subjected to matrix processing to produce the luminance signal Y, color signal (B-Y)L, (R-Y)L shown in FIG. 4(b).
is generated and supplied to each correction section 6a to 6c, and the transmission signal generation section 4 performs matrix processing on the R signal, G signal, and B signal to produce a luminance signal Y' and color shown in FIG. 4(c). Signal (B-Y)L', (R-Y)L
' is generated.

Thereafter, the matrix circuit 15 of the local decoder 12 constituting the first-stage correction section 6a outputs the luminance signal Y', color signal (B-Y) L', ( RY)L' is subjected to inverse matrix processing and the R' signal, G' signal, and B shown in FIG. 4(d) are obtained.
'signal is generated, and is subjected to inverse gamma correction by each inverse gamma correction circuit 16 of the local decoder 12 to generate the R signal, G signal, and B signal shown in FIG. The matrix circuit 17 processes the luminance signal Y and the color signal (B
-Y) and (RY) are generated.

[0055] Then, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (B) shown in FIG. 4(f).
-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6a outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the signal correction section 14 of the correction section 6a outputs the luminance signal Y', color signal (B-Y)L', (R-Y) from the transmission signal generation section 4.
)L', respectively, to generate a luminance signal Y', color signals (B-Y)L', and (R-Y)L' shown in FIG. 4(g).

Thereafter, the matrix circuit 15 of the local decoder 12 provided in the second stage correction section 6b outputs the luminance signal Y', color signal (B-Y)L', ( RY) L' is subjected to inverse matrix processing to produce R' signal, G' signal, and B signal shown in FIG. 5(a).
'signal is generated, and after this is inverse gamma corrected by each inverse gamma correction circuit 16 of the local decoder 12 to generate the R signal, G signal, and B signal shown in FIG. 5(b), the local decoder 12 The luminance signal Y, color signals (B-Y), and (RY) are subjected to matrix processing by the matrix circuit 17 in the subsequent stage, and the color signals (B-Y ), (RY) are cut, and the local decoder 12 outputs the luminance signal Y, color signal (B-Y)L, (RY)L shown in FIG. 5(c).
is output.

Next, the correction signal generation section 13 of the correction section 6b outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the correction unit 6b
The signal correction section 14 outputs the luminance signal Y', color signal (B-Y)L', (R-
Y)L', the brightness correction signal SY output from the correction signal generation section 13, the color correction signal S(B-Y), S(
R-Y) are added to produce a luminance signal Y', a color signal (B-Y)L', and (R-Y)L' shown in FIG. 5(d), respectively.
is generated.

Next, the matrix circuit 15 of the local decoder 12 constituting the three-stage correction section 6c calculates the luminance signal Y', color signal (B-Y) L', ( RY)L' is subjected to inverse matrix processing to produce the R' signal, G' signal, and B signal shown in FIG. 6(a).
'signal is generated, and is subjected to inverse gamma correction by each inverse gamma correction circuit 16 of the local decoder 12 to generate the R signal, G signal, and B signal shown in FIG. 6(b). The matrix circuit 17 processes the luminance signal Y and the color signal (B
-Y) and (RY) are generated.

Then, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (B) shown in FIG. 6(c).
-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6c outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the signal correction section 14 of the correction section 6c outputs the luminance signal Y', color signal (B-Y)L', (R- Y)
The luminance signal Y shown in FIG. 6(d) is added to L' respectively.
', color signals (B-Y)L', and (RY)L' are generated and supplied to the receiver 2 as corrected transmission signals.

[0062] Then, the matrix circuit 21 of the receiver 2
The luminance signal Y', color signals (B-Y)L', and (RY)L' output from the image transmitter 1 are subjected to inverse matrix processing to produce R' signals and G shown in FIG. 7(a). 'signal,
A B' signal is generated and displayed on the CRT 22 as shown in FIG. 7(b).
A GB screen, that is, an RGB screen corresponding to the luminance signal Y, color signals (BY)L, (RY)L shown in FIG. 7(c) is displayed.

In this case, the luminance signal Y shown in FIG. 7(c),
The color signals (B-Y)L, (R-Y)L, the luminance signal Y of the reproduction signal generation section 5 shown in FIG. 4(b), and the color signal (B-Y)
L, (RY)L, that is, a luminance signal Y indicating the correct RGB screen for the R light image, G light image, and B light image input to the image transmitter 1, and the color signal (B-Y)L, (R -Y
)L, it is clear that the brightness signal Y, color signals (B-Y)L, (RY)L on the image transmitter 1 side can be accurately reproduced on the receiver 2 side. .

[0064] The image feeder 1 also transmits an R light image, a G light image, and a B light image.
When an optical image is input and each optical/electrical converter outputs an R signal, a G signal, and a B signal showing the cyan and white striped patterns shown in FIG. The R signal, G signal, and B signal are subjected to matrix processing and are shown in Figure 8(b).
Luminance signal Y, color signal (B-Y)L, (R-Y) shown in
L is generated and supplied to each correction section 6a to 6c, and the transmission signal generation section 4 generates the R signal, G
The B signal is subjected to matrix processing to produce the luminance signal Y', color signal (B-Y)L', (R-Y)L shown in FIG. 8(c).
' is generated.

Thereafter, the matrix circuit 15 of the local decoder 12 constituting the first-stage correction section 6a outputs the luminance signal Y', color signal (B-Y) L', ( RY)L' is subjected to inverse matrix processing to produce R' signal, G' signal, and B signal shown in FIG. 8(d).
'signal is generated, and is subjected to inverse gamma correction by each inverse gamma correction circuit 16 of the local decoder 12 to generate the R signal, G signal, and B signal shown in FIG. 8(e). The matrix circuit 17 processes the luminance signal Y and the color signal (B
-Y) and (RY) are generated.

Then, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (B) shown in FIG. 8(f).
-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6a outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the signal correction section 14 of the correction section 6a outputs the luminance signal Y', color signal (B-Y)L', (R-Y) from the transmission signal generation section 4.
)L', respectively, to generate a luminance signal Y', color signals (B-Y)L', and (R-Y)L' shown in FIG. 8(g).

Thereafter, the matrix circuit 15 of the local decoder 12 constituting the second stage correction section 6b outputs the luminance signal Y', color signal (B-Y)L', (R) from the correction section 6a. -Y) L' is subjected to inverse matrix processing and R' signal, G' signal, B' shown in FIG. 9(a)
A signal is generated, which is subjected to inverse gamma correction by each inverse gamma correction circuit 16 of the local decoder 12, as shown in FIG.
The R signal, G signal, and B signal shown in FIG.
, (RY) are generated, and the color signal (B-Y) is generated by each low-pass filter 18 of the local decoder 12.
, (RY) are cut, and the local decoder 12 outputs the luminance signal Y and color signals (B-Y)L, (RY)L shown in FIG. 9(c).

Next, the correction signal generation section 13 of the correction section 6b outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the correction unit 6b
The signal correction section 14 outputs the luminance signal Y', color signal (B-Y)L', (R-
Y)L', the brightness correction signal SY output from the correction signal generation section 13, the color correction signal S(B-Y), S(
RY) are added to produce the luminance signal Y', color signal (B-Y)L', and (RY)L' shown in FIG. 9(d), respectively.
is generated.

Next, the matrix circuit 15 of the local decoder 12 constituting the three-stage correction section 6c calculates the luminance signal Y', color signal (B-Y) L', ( R' signal, G' signal shown in FIG. 10(a) after R' is subjected to inverse matrix processing,
A B′ signal is generated, which is transmitted to the local decoder 12.
The matrix circuit 1 of the local decoder 12 undergoes inverse gamma correction to generate the R signal, G signal, and B signal shown in FIG.
7, matrix processing is performed to generate a luminance signal Y, color signals (B-Y), and (R-Y).

[0071] Then, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (R-Y) shown in FIG. 10(c).
B-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6c outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the signal correction section 14 of the correction section 6c outputs the luminance signal Y', color signal (B-Y)L', (R- Y)
L' are added to generate the luminance signal Y', color signals (B-Y)L', and (RY)L' shown in FIG. 10(d), which are sent to the receiver as corrected transmission signals. 2.

[0073] Then, the matrix circuit 21 of the receiver 2
The luminance signal Y', color signals (B-Y)L', and (RY)L' output from the image transmitter 1 are subjected to inverse matrix processing to produce R' signals and G shown in FIG. 11(a). The 'signal, B' signal is generated and the RGB screen shown in FIG. 11(b) is displayed on the CRT 22, that is, the luminance signal Y shown in FIG. 11(c).
, R corresponding to the color signals (B-Y)L, (RY)L
The GB screen is displayed.

In this case, the luminance signal Y shown in FIG. 11(c)
, color signals (B-Y)L, (RY)L, and FIG. 8(b
), the luminance signal Y and color signal (B-
Comparing Y)L and (RY)L, it is clear that the degree of convergence is somewhat lower than in the case of the red and black striped pattern described above, but the luminance signal Y,
The color signals (B-Y)L and (RY)L can be sufficiently reproduced on the receiver 2 side.

FIG. 12 is a block diagram showing an example of a television system using the second embodiment of the television signal transmission system according to the present invention. In this figure, the same parts as those shown in FIG. 1 are given the same reference numerals.

The television system shown in this figure is shown in FIG.
The difference from the television system shown in FIG. Luminance signals Y' output from the correction units 6a and 6b,
The color signals (B-Y)L' and (R-Y)L' are multiplied by preset coefficients and then added together to generate a transmission signal.

The signal correction section 30 has three parts as shown in FIG.
Luminance signal Y', color signal (B-Y) L', (R-Y) output from the first-stage correction section 6a having two coefficient multipliers 31
It has a weighting circuit 32 that multiplies L' by a preset coefficient (for example, 0.5) and three coefficient units 33.
A weighting circuit that applies a preset coefficient (for example, 0.5) to the luminance signal Y', color signals (B-Y)L', and (RY)L' output from the correction section 6b in the first stage. 34
, the luminance signal Y', the color signal (B-Y)L', (
R-Y)L', luminance signal Y' output from the weighting circuit 34, color signal (B-Y)L', (R-Y)L
', respectively, and a luminance signal Y' and a color signal (
After multiplying B-Y)L' and (R-Y)L' by a preset coefficient, they are added together to obtain the luminance signal Y.
', color signals (B-Y)L', and (RY)L' are generated and supplied to the receiver 2 as corrected transmission signals.

Next, the operation of this embodiment will be explained with reference to the schematic diagrams shown in FIGS. 14 to 19.

First, the image transmitter 1 receives an R light image, a G light image, and a B light image.
An optical image is input and transmitted from each optical/electrical converter 3 as shown in FIG. 14(a).
When the R signal, G signal, and B signal showing the red and black striped pattern shown in FIG.
), the luminance signal Y, the color signal (B-Y)L, (R-Y
)L is generated and supplied to each correction section 6a, 6b, and the transmission signal generation section 4 generates the R signal,
The G signal and B signal are subjected to matrix processing and are shown in FIG. 14(c).
Luminance signal Y', color signal (B-Y)L', (R-
Y) L' is generated.

Then, the matrix circuit 15 of the local decoder 12 constituting the first stage correction section 6a outputs the luminance signal Y', color signal (B-Y)L', (R -Y) R' signal, G' signal shown in FIG. 14(d) after L' is subjected to inverse matrix processing,
A B′ signal is generated, which is transmitted to the local decoder 12.
After the R signal, G signal, and B signal shown in FIG. 14(e) are generated by the inverse gamma correction circuit 16 of
7, matrix processing is performed to generate a luminance signal Y, color signals (B-Y), and (R-Y).

After that, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (R-Y) shown in FIG. 14(f).
B-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6a outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the correction unit 6a
The luminance signal Y', color signal (B-Y)L', (R-Y) output from the transmission signal generation section 4 by the signal correction section 14 of
)L', the brightness correction signal SY output from the correction signal generation section 13, the color correction signal S(B-Y), S(R
-Y) are added to produce a luminance signal Y', a color signal (B-Y)L', and (R-Y)L' shown in FIG. 14(g), respectively.
is generated and this is sent to the second stage correction section 6a and the signal correction section 3.
0.

After this, the matrix circuit 15 of the local decoder 12 constituting the second stage correction section 6b
The luminance signal Y', color signals (B-Y)L', and (RY)L' outputted from the correction section 6a of the second stage are subjected to inverse matrix processing to obtain an R' signal shown in FIG. 15(a), A G' signal and a B' signal are generated, which are sent to the local decoder 1.
The R signal, G signal, and B signal shown in FIG. 15(b) are subjected to inverse gamma correction by each of the inverse gamma correction circuits 16 of 2, and then subjected to matrix processing by the matrix circuit 17 of the local decoder 12 to produce a luminance signal. Y, color signals (B-Y), and (RY) are generated.

Then, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (R-Y) shown in FIG. 15(c).
B-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6b outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the correction unit 6b
The signal correction section 14 outputs the luminance signal Y', color signal (B-Y)L', (R-
Y)L', the brightness correction signal SY output from the correction signal generation section 13 of the correction section 6b, and the color correction signal S(B-
Y) and S(RY) are added, respectively, and the result shown in FIG. 15(
Luminance signal Y', color signal (B-Y)L', (
RY)L' is generated, and this is the signal correcting section 30
supplied to

Then, one of the weighting circuits 32 constituting the signal correction section 30 outputs the luminance signal Y', color signal (B-Y)L', (R-
Y) A preset coefficient for L' (for example, 0.5
), and the other weighting circuit 34 constituting the signal correction section 30 outputs the luminance signal Y', color signal (B-Y)L', (
RY) L' has a preset coefficient (for example, 0
．． 5), the luminance signal Y', color signal (B-Y)L', (R-Y) output from the weighting circuit 32 by the addition section 36 constituting the signal correction section 30
L', the luminance signal Y' output from the weighting circuit 34, the color signals (B-Y)L', and (RY)L' are added to produce the luminance signal Y' shown in FIG. 16(a). , color signals (B-Y)L' and (R-Y)L' are generated and supplied to the receiver 2 as corrected transmission signals.

[0087] Then, the matrix circuit 21 of the receiver 2
The luminance signal Y', color signals (B-Y)L', and (RY)L' output from the image transmitter 1 are subjected to inverse matrix processing to produce R' signals and G shown in FIG. 16(b). The 'signal, B' signal is generated and the RGB screen shown in FIG. 16(c) is displayed on the CRT 22, that is, the luminance signal Y shown in FIG. 16(d).
, R corresponding to the color signals (B-Y)L, (RY)L
The GB screen is displayed.

In this case, the luminance signal Y shown in FIG. 16(d)
, color signals (B-Y)L, (RY)L, and FIG. 14(
The luminance signal Y and the color signal (B) of the reproduced signal generation section 5 shown in b)
-Y)L, (RY)L, that is, the correct R for the R light image, G light image, and B light image input to the image feeder 1
Luminance signal Y indicating GB screen, color signal (B-Y) L, (
When compared with RY)L, it is clear that the luminance signal Y on the image transmitter 1 side, the color signal (B-Y)L, (RY)
The RGB screen corresponding to L can be accurately reproduced on the receiver 2 side.

[0089] The image feeder 1 also transmits an R light image, a G light image, and a B light image.
An optical image is input and transmitted from each optical/electrical converter 3 as shown in FIG. 17(a).
R signal, G signal showing the cyan and white striped pattern shown in
When the B signal is output, the R signal, G signal, and B signal are subjected to matrix processing by the reproduced signal generating section 5, and the result is shown in FIG.
7(b), the luminance signal Y, color signal (B-Y)L, (
R−Y)L is generated and supplied to each correction section 6a, 6b, and the transmission signal generation section 4
The signal, G signal, and B signal are subjected to matrix processing and are shown in Figure 17.
Luminance signal Y', color signal (B-Y)L', shown in (c),
(RY)L' is generated.

Then, the matrix circuit 15 of the local decoder 12 constituting the first stage correction section 6a outputs the luminance signal Y', color signal (B-Y)L', (R -Y) R' signal, G' signal shown in FIG. 17(d) after L' is subjected to inverse matrix processing,
A B′ signal is generated, which is transmitted to the local decoder 12.
The inverse gamma correction circuits 16 perform inverse gamma correction to generate the R signal, G signal, and B signal shown in FIG. Y, color signals (B-Y), and (RY) are generated.

After that, the color signals (B-Y), (
The high frequency components of R-Y) are cut and the local decoder 12 outputs the luminance signal Y and color signal (R-Y) shown in FIG. 17(f).
B-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6a outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the correction unit 6a
The luminance signal Y', color signal (B-Y)L', (R-Y) output from the transmission signal generation section 4 by the signal correction section 14 of
)L', the brightness correction signal SY output from the correction signal generation section 13, the color correction signal S(B-Y), S(R
-Y) are added to produce a luminance signal Y', a color signal (B-Y)L', and (R-Y)L' shown in FIG. 17(g), respectively.
is generated and supplied to the second stage correction section 6a and the signal correction section 30.

After that, the matrix circuit 15 of the local decoder 12 constituting the second stage correction section 6b
The luminance signal Y', color signals (B-Y)L', and (RY)L' outputted from the correction section 6a of the second stage are subjected to inverse matrix processing to obtain an R' signal shown in FIG. 18(a), A G' signal and a B' signal are generated, which are sent to the local decoder 1.
After the inverse gamma correction is performed by each inverse gamma correction circuit 16 in the local decoder 12 to generate the R signal, G signal, and B signal shown in FIG. A signal Y, color signals (B-Y), and (RY) are generated.

Then, the color signals (B-Y), (
The high frequency components of RY) are cut and the local decoder 12 outputs the luminance signal Y and color signal (RY) shown in FIG. 18(c).
B-Y)L and (RY)L are output.

Next, the correction signal generation section 13 of the correction section 6b outputs the luminance signal Y, color signals (B-Y)L, (R-Y)L output from the local decoder 12, and the reproduction signal generation section. The luminance signal Y, color signals (B-Y)L, and (RY)L outputted from 5 are compared to produce a luminance correction signal SY, a color correction signal S(B-Y), and a color correction signal S(B-Y), respectively.
S(RY) is generated, and the correction unit 6b
The signal correction section 14 outputs the luminance signal Y', color signal (B-Y)L', (R-
Y)L', the brightness correction signal SY output from the correction signal generation section 13 of the correction section 6b, and the color correction signal S(B-
Y) and S(RY) are added, respectively, and the result shown in FIG.
Luminance signal Y', color signal (B-Y)L', (
RY)L' is generated, and this is the signal correcting section 30
is supplied to

Then, one of the weighting circuits 32 constituting the signal correction section 30 outputs the luminance signal Y', color signal (B-Y)L', (R-
Y) A preset coefficient for L' (for example, 0.5
), and the other weighting circuit 34 constituting the signal correction section 30 outputs the luminance signal Y', color signal (B-Y)L', (
RY) L' has a preset coefficient (for example, 0
．． 5), the luminance signal Y', color signal (B-Y)L', (R-Y) output from the weighting circuit 32 by the addition section 36 constituting the signal correction section 30
L', the luminance signal Y' output from the weighting circuit 34, the color signals (B-Y)L', and (RY)L' are added to produce the luminance signal Y' shown in FIG. 19(a). , color signals (B-Y)L' and (R-Y)L' are generated and supplied to the receiver 2 as corrected transmission signals.

Then, the matrix circuit 21 of the receiver 2
The luminance signal Y', color signals (B-Y)L', and (RY)L' output from the image transmitter 1 are subjected to inverse matrix processing to produce R' signals and G shown in FIG. 19(b). The 'signal, B' signal is generated and the RGB screen shown in FIG. 19(c) is displayed on the CRT 22, that is, the luminance signal Y shown in FIG. 19(d).
, R corresponding to the color signals (B-Y)L, (RY)L
The GB screen is displayed.

In this case, the luminance signal Y shown in FIG. 19(d)
, color signals (B-Y)L, (RY)L, and FIG. 17(
The luminance signal Y and the color signal (B) of the reproduced signal generation section 5 shown in b)
-Y)L, (RY)L, that is, the correct R for the R light image, G light image, and B light image input to the image feeder 1
Luminance signal Y indicating GB screen, color signal (B-Y) L, (
When compared with RY)L, it is clear that the luminance signal Y on the image transmitter 1 side, the color signal (B-Y)L, (RY)
The RGB screen corresponding to L can be accurately reproduced on the receiver 2 side.

FIG. 20 is a block diagram showing an example of a television system using the third embodiment of the television signal transmission system according to the present invention. In this figure, the same parts as those shown in FIG. 1 are given the same reference numerals.

The television system shown in this figure is shown in FIG.
The difference from the television system shown in FIG. Y)
L' is supplied to the receiver 2 as a transmission signal.

[0101] Even in this case, although the accuracy is reduced to some extent, the luminance signal Y on the image transmitter side is
, color signals (B-Y)L, (RY)L can be accurately reproduced on the receiver 2 side.

FIG. 21 is a block diagram showing an example of a television system using the fourth embodiment of the television signal transmission system according to the present invention. In this figure, the same parts as those shown in FIG. 1 are given the same reference numerals.

The television system shown in this figure is shown in FIG.
The difference from the television system shown in FIG. Signal S(B-Y), S(R-Y
) is returned by the transmission signal generation section 40 and the color signal (B-Y)L', (
R-Y)L' is corrected, and the correction unit 42 corrects the luminance signal Y' output from the transmission signal generation unit 40, and the luminance signal Y obtained by these correction operations is
', color signals (B-Y)L', and (RY)L' are supplied to the receiver 2 as corrected transmission signals.

As shown in FIG. 22, the transmission signal generation section 40 includes three gamma correction circuits 9 that perform gamma correction on the R signal, G signal, and B signal when they are supplied from each photo/electrical converter 3. , the R' signal, G' signal, and B' signal output from each gamma correction circuit 9 are subjected to matrix processing to produce a luminance signal Y', color signals (B-Y)L', (R-Y)L.
A matrix circuit 10 that generates color signals (B-Y)', (R
-Y)' and the color correction signal S output from the correction section 42
(B-Y) and S(R-Y), respectively, to correct the color signals (B-Y)' and (R-Y)', and each of these adders 45 The color signal output from (
Cut the high frequency components of B-Y)' and (RY)' to generate color signals (B-Y)L' and (R-Y)L'2
After gamma correction processing is performed on the R signal, G signal, and B signal output from each photo/electrical converter 3, the luminance signal Y',
Color signals (B-Y)' and (RY)' are generated. Then, the color signals (B-Y)', (RY)' and the correction unit 4
Color correction signals S(B-Y) and S(R-
Y) are added to obtain the color signals (B-Y)', (
After correcting the color signals (B-Y)L', (R-Y)', the high-frequency components of the color signals (B-Y)', (R-Y)' obtained by this correction process are cut. -Y)L' and sends this together with the luminance signal Y' to the correction unit 4.
Supply to 2.

As shown in FIG. 23, the correction section 42 includes a local decoder 12, a correction signal generation section 13, and a signal generation section 46.
The luminance signal Y, color signals (B-Y)L, (RY)L outputted from the reproduction signal generation section 5, and the luminance signal Y' outputted from the transmission signal generation section 40. , the brightness correction signal SY, the color correction signal S(B-Y), S(
RY) is generated. Then, the color correction signals S(B-Y), S(R-Y)
is supplied to the transmission signal generation section 40 to generate the color signal (B
-Y)L' and (RY)L' are corrected, and the luminance signal Y' is corrected based on the luminance correction signal SY.
The brightness signal Y' obtained by this correction operation is
and the color signal (B
-Y)L' and (RY)L' are supplied to the receiver 2 as corrected transmission signals.

In this case, the signal correction section 46 is constituted by one adder 20, and the luminance signal Y' outputted from the transmission signal generation section 40 and the correction signal generation section 1
The brightness signal Y' is corrected by adding the brightness correction signal SY output from the transmitter 3, and this is supplied to the receiver 2 as a transmission signal.

[0107] Even in this case, the luminance signal Y, color signal (B-Y) L, color signal (B-Y) L,
(RY)L can be almost accurately reproduced on the two receiver sides.

FIG. 24 is a block diagram showing an example of a television system using the fifth embodiment of the television signal transmission system according to the present invention. In this figure, the same parts as those shown in FIG. 1 are given the same reference numerals.

The television system shown in this figure is shown in FIG.
The difference from the television system shown in FIG. Luminance signal Y', color signal (B-Y)L
', (RY)L' and the brightness signal Y output from the reproduced signal generating unit 50, the brightness correction signal SY is generated in the correction unit 51, and this brightness correction signal SY
The luminance signal Y' outputted from the transmission signal generation section 4 is corrected based on the luminance signal Y' obtained by this correction operation and the color signal outputted from the transmission signal generation section 4 (
B-Y)L' and (RY)L' are supplied to the receiver 2 as corrected transmission signals.

In this case, the reproduced signal generating section 50 is constituted by one matrix circuit 7 as shown in FIG. to generate a luminance signal Y,
This is supplied to the correction section 51.

As shown in FIG. 26, the correction section 51 includes a local decoder 55, a correction signal generation section 56, and a signal correction section 57.
A luminance signal Y output from the reproduction signal generation section 50, a luminance signal Y' output from the transmission signal generation section 4, a color signal (B-Y)L', (R-Y )L
The luminance correction signal SY is generated based on the luminance correction signal SY, and the luminance signal Y' outputted from the transmission signal generation section 4 is corrected based on the luminance correction signal SY. ' and the color signal (B-Y)L' output from the transmission signal generation section 4, (R-Y
) L' is supplied to the receiver 2 as a corrected transmission signal.

The local decoder 55 receives the luminance signal Y' and the color signal (B-Y) L output from the transmission signal generating section 4.
', (RY)L' by inverse matrix processing and R'
A matrix circuit 15 that generates a signal, a G' signal, and a B' signal, and an R' output from this matrix circuit 15.
Inverse gamma correction for each signal, G' signal, and B' signal 3
It is equipped with two inverse gamma correction circuits 16 and a matrix circuit 17 that performs matrix processing on the R signal, G signal, and B signal outputted from each of these inverse gamma correction circuits 16 to generate a luminance signal Y. Luminance signal Y', color signal (B-Y) L', (R-
Y) L' is sequentially subjected to inverse matrix processing, inverse gamma correction processing, and matrix processing to generate a luminance signal Y, which is supplied to the correction signal generation section 56.

The correction signal generation section 56 is constituted by one comparator 19, and compares the luminance signal Y outputted from the local decoder 55 and the luminance signal Y outputted from the reproduction signal generation section 5. A brightness correction signal SY corresponding to these differences is generated and supplied to the signal correction section 57.

The signal correction section 57 is constituted by one adder 20, and the luminance signal Y' outputted from the transmission signal generation section 4, the luminance correction signal SY outputted from the correction signal generation section 56, and The transmission signal generation unit 4
The luminance signal Y' outputted from the transmission signal generator 4 is corrected, and the luminance signal Y' obtained by this correction operation is combined with the luminance signal Y' outputted from the transmission signal generator 4.
Color signals (B-Y)L', (R-Y)L output from
' is supplied to the receiver 2 as a corrected transmission signal.

Even in this case, the luminance signal Y on the image transmitter 1 side can be almost accurately reproduced on the image receiver 2 side, as in each of the embodiments described above.

[0116]

Effects of the Invention As explained above, according to the present invention, the image transmitter side has an R
Even if a GB signal is input, the receiver can accurately reproduce the brightness and chromaticity.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a television system to which a first embodiment of a television signal transmission system according to the present invention is applied.

FIG. 2 is a block diagram showing a detailed circuit configuration example of a transmission signal generation section and a reproduction signal generation section shown in FIG. 1;

FIG. 3 is a block diagram showing a detailed circuit configuration example of each correction section shown in FIG. 1;

FIG. 4 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1;

FIG. 5 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1;

6 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1. FIG.

7 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1. FIG.

8 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1. FIG.

9 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1. FIG.

10 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1. FIG.

11 is a schematic diagram showing an example of the operation of the television system shown in FIG. 1. FIG.

FIG. 12 is a block diagram showing an example of a television system to which a second embodiment of the television signal transmission system according to the present invention is applied.

FIG. 13 is a block diagram showing a detailed circuit configuration example of the signal correction section shown in FIG. 12;

14 is a schematic diagram showing an example of the operation of the television system shown in FIG. 12. FIG.

15 is a schematic diagram showing an example of the operation of the television system shown in FIG. 12. FIG.

16 is a schematic diagram showing an example of the operation of the television system shown in FIG. 12. FIG.

17 is a schematic diagram showing an example of the operation of the television system shown in FIG. 12. FIG.

18 is a schematic diagram showing an example of the operation of the television system shown in FIG. 12. FIG.

19 is a schematic diagram showing an example of the operation of the television system shown in FIG. 12. FIG.

FIG. 20 is a block diagram showing an example of a television system to which a third embodiment of the television signal transmission system according to the present invention is applied.

FIG. 21 is a block diagram showing an example of a television system to which a fourth embodiment of the television signal transmission system according to the present invention is applied.

22 is a block diagram showing a detailed circuit configuration example of a transmission signal generation section and a reproduction signal generation section shown in FIG. 21. FIG.

FIG. 23 is a block diagram showing a detailed circuit configuration example of the correction section shown in FIG. 21;

FIG. 24 is a block diagram showing an example of a television system to which a fifth embodiment of the television signal transmission system according to the present invention is applied.

25 is a block diagram showing a detailed circuit configuration example of a transmission signal generation section and a reproduced signal generation section shown in FIG. 24. FIG.

FIG. 26 is a block diagram showing a detailed circuit configuration example of the correction section shown in FIG. 24;

FIG. 27 is a block diagram of a television system showing an example of a conventionally known television signal transmission system.

28 is a schematic diagram showing an example of the operation of the television system shown in FIG. 27. FIG.

29 is a schematic diagram showing an example of the operation of the television system shown in FIG. 27. FIG.

FIG. 30 is a block diagram of a television system showing another example of a conventionally known television signal transmission system.

FIG. 31 is a block diagram showing a detailed circuit example of the correction signal generation section shown in FIG. 30;

32 is a schematic diagram showing an example of the operation of the television system shown in FIG. 30. FIG.

33 is a schematic diagram showing an example of the operation of the television system shown in FIG. 30. FIG.

[Explanation of symbols]

1 Image transmitter 2 Receiver 3. Optical/electrical converter 4 Transmission signal generation section 5 Playback signal generation section 6a-6n Correction section 21 Matrix circuit 22 CRT

Claims (5)

[Claims] [Claim 1] R signal, G signal, B signal depending on the image transmitter side.
A luminance signal and a color signal are generated from the signal and output as transmission signals, and the receiver side transmits the luminance signal and the color signal.
In a television signal transmission system that receives a color signal and reproduces an RGB screen corresponding to the R signal, G signal, and B signal from the luminance signal and the color signal, the image transmitter receives the input R signal, A luminance signal and a color signal are generated from the G signal and the B signal, and a signal to be reproduced on the receiver side is calculated based on the luminance signal and the color signal, and this signal and the R signal and the G signal are , the luminance signal and the color signal are corrected multiple times according to the difference with the B signal, and the luminance signal and color signal obtained by this correction operation are supplied to the receiver side as transmission signals. A television signal transmission system characterized by: 2. The image transmitter generates a luminance signal and a color signal from the input R signal, G signal, and B signal, and reproduces the signal on the receiver side based on the luminance signal and the color signal. The luminance signal and the color signal are corrected several times according to the difference between this signal and the R signal, G signal, and B signal, and each of the signals obtained by this correction operation is 2. The television signal transmission system according to claim 1, wherein a luminance signal and a chrominance signal are generated by weighting and adding each step of the luminance signal and chrominance signal, and these signals are supplied to the receiver as a transmission signal. 3. The image transmitter generates a luminance signal and a color signal from the input R signal, G signal, and B signal, and reproduces the signal on the receiver side based on the luminance signal and the color signal. The luminance signal and the chrominance signal are divided into 1 according to the difference between this signal and the R signal, G signal, and B signal.
2. The television signal transmission system according to claim 1, wherein the corrected luminance signal and color signal are supplied to the receiver as transmission signals. 4. The image transmitter generates a luminance signal and a color signal from the input R signal, G signal, and B signal, and reproduces the signal on the receiver side based on these luminance signals and color signals. The color signal that is the base of the color signal and the luminance signal are corrected according to the difference between this signal and the R signal, G signal, and B signal, and the corrected luminance signal is calculated. ,
2. The television signal transmission system according to claim 1, wherein a color signal is supplied to the receiver as a transmission signal. 5. The image transmitter generates a luminance signal and a color signal from the input R signal, G signal, and B signal, and reproduces the signal on the receiver side based on the luminance signal and the color signal. and corrects the luminance signal according to the difference between this signal and the R signal, G signal, and B signal, and transmits the color signal and the corrected luminance signal to the receiver as a transmission signal. 2. The television signal transmission system according to claim 1, wherein the television signal is transmitted to a side.