JPH05260441A - Configuration method for television signal - Google Patents

Abstract

PURPOSE:To produce a program without hindrance by replacing a component of an auxiliary signal with a zero signal and forming a television signal of the letter box system when picture processing results in deteriorating an auxiliary signal in a studio equipment or the like. CONSTITUTION:An existing studio equipment section 8 implements picture processing required for program production such as reduction, expansion, rotation, wiping, chromakie of picture according to a control signal of a control section 10 and outputs a composite color television signal VLP of a processed picture. An auxiliary signal masking processing section 9 replaces a component of an auxiliary signal in a non-picture area on and below the signal VLP when the picture processing by the existing studio equipment section 8 results in deteriorating the auxiliary signal according to control signals MSKF (H level for a period of upper and lower non-picture area) and CTL (H level for a period when the auxiliary signal is deteriorated). Then, masking processing is implemented and a television signal VS of the letter box system is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a television signal, and more particularly, to a television signal construction suitable for a letter box system which is compatible with the current television system to widen the screen. Regarding the method.

[0002]

2. Description of the Related Art Research and development of an EDTV that provides a more realistic TV image by achieving compatibility with the current television system and achieving high image quality, high definition, and wide screen have been promoted. There is.

One implementation of this EDTV is called the letterbox system. In this system, non-image areas are provided above and below a display screen having an aspect ratio of the current television system to transmit a horizontally long image having a horizontally long aspect ratio. This type of television signal is characterized in that it can receive a horizontally long image with a horizontally long aspect ratio even when received by a current receiver, and has little interference with the current receiver. For this reason, it is considered to be a powerful realization of EDTV.

In the letterbox system, a television signal is formed in such a manner that information for high definition is superimposed as auxiliary signals on the upper and lower non-image areas of the screen. And
Regarding the configuration of the letterbox type television signal, for example, Japanese Patent Laid-Open Publication No. 3-159388,
Examples include those described in JP-A-3-198593 and JP-A-3-206788.

[0005]

When a letterbox type television signal constructed by the above-mentioned conventional technique is used as a material for program production or the like, various image processing in studio equipment causes no upper and lower sides. There is a problem that the auxiliary signal superimposed on the image area is damaged.

An object of the present invention is to solve the above-mentioned problems and provide a method of constructing a letterbox type television signal in such a form that program production can be operated without any influence of various image processing in studio equipment. To do.

[0007]

In order to achieve the above object, in the present invention, when the auxiliary signals superimposed on the upper and lower non-picture areas of a letterbox type television signal are damaged by image processing in studio equipment. In addition, the letter-box type television signal is configured in such a manner that the horizontally long image portion is preserved as it is and only the component of the auxiliary signal is replaced with a zero signal.

[0008]

According to the present invention, the upper and lower non-image areas are subjected to image processing in the studio equipment such that the auxiliary signals superimposed on the upper and lower non-image areas are impaired, for example, image reduction, expansion and rotation. The auxiliary signal component of is set to zero. Further, the horizontally long image portion forms a letterbox type television signal by the image subjected to the image processing. Therefore, on the image receiving side, since the image reproduction is simply performed without the auxiliary signal, the image quality deterioration due to the loss of the auxiliary signal does not occur.

On the other hand, in the image processing in which the auxiliary signal is preserved, a letterbox type television signal can be constructed in such a manner that the auxiliary signal components in the upper and lower non-image areas are preserved even in the processed image.

Further, according to the present invention, since image processing in the studio equipment is carried out by the television signal of the letterbox system, it can be operated by the existing studio equipment like the program production of the current television system.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the block diagram shown in FIG.

In the HDTV image pickup unit 1, for example, the aspect ratio is 16: 9, the number of scanning lines is 1125, and 30 frames /
Second, 3 primary color signals R in the form of 2: 1 interlaced scanning,
The image signal VH of the component of G, B (or the luminance signal Y, the color difference signals RY, BY) is generated. Then, the progressive scan conversion unit 4 performs a scan conversion process to convert the image signal VHC into the image signal VHC in the form of 525 scanning lines, double the frame frequency of the current television system, and 1: 1 progressive scanning.

In the progressive scanning image pickup unit 2, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, the frame frequency is twice that of the current television system, and the aspect ratio of 1: 1 progressive scanning is 3
Primary color signals R, G, B (or luminance signal Y, color difference signal R-
Y, B-Y) component image signal VPS is generated.

The HD / EDTV encoder unit 5 performs predetermined letterbox type encoding processing such as scanning line number conversion, interlace scanning conversion, color modulation, and auxiliary signal generation on the image signal VPS (VHC). A letter box type composite color television signal VES (VHS) of 525 scanning lines and 2: 1 interlaced scanning is generated.

In the interlaced scanning image pickup unit 3, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, the same frame frequency as that of the current television system, 2: 1 interlaced scanning, and three primary color signals R, The image signal VIS of the component of G, B (or the luminance signal Y, the color difference signals RY, BY) is generated.

The EDTV encoder unit 6 performs predetermined letter-box encoding processing such as scanning line number conversion, color modulation, and auxiliary signal generation, and the number of scanning lines is 525.
A 2: 1 interlaced scanning letterbox type composite color television signal VSS is generated.

In the selection unit 7, the signals VHS,
Select the corresponding signal of VES and VSS and output signal VL
Output as.

The current studio equipment section 8 performs image processing necessary for program production according to the control signal from the control section 10, for example, image reduction, extension, rotation, wipe, chroma key, etc., and a composite color television of the processed image. John signal VL
Output P.

In the auxiliary signal masking processing unit 9, when image processing is performed according to the control signals MSKF and CTL of the control unit 10 so that the auxiliary signal is impaired in the current studio equipment unit, the non-image area above and below the signal VLP. Masking process to replace the component of the auxiliary signal of
A letterbox television signal VS is generated.

Hereinafter, each block portion in this embodiment will be described based on the embodiment.

FIG. 2 is a block diagram of an embodiment of the HD / EDTV encoder unit 5.

Aspect ratio 16: 9, number of scanning lines 525
Image signal VPS of this 1: 1 progressive scan component
The (VHC) is sampled by the A / D converter 11 at a frequency of, for example, 8 times the color subcarrier fsc of the current television system and converted into a digital signal. And YIQ
The conversion unit 12 performs a predetermined matrix calculation operation,
An image signal VP (luminance signal YP, color difference signals IP, QP) converted into a luminance signal and color difference I, Q signals is created.

The scanning line conversion unit 13 performs conversion of the number of scanning lines such as 4 to 3 conversion of scanning lines as will be described later, and a signal of 480 effective pixel scanning lines of the image signal VP is sent by the letterbox method. The number of effective pixel scanning lines corresponding to the horizontally long image portion is converted into an image signal VP '(luminance signal YP', color difference signals IP ', QP') of 360 lines.

The interlace conversion unit 14 performs a 2: 1 thinning-out process for the scanning lines of the progressive scanning system and a double expansion of the time axis to perform an image signal VI '(luminance signal) in the form of 2: 1 interlaced scanning. YI ′, color difference signals II ′, QI ′) are generated.

The main signal modulator 15 adds and multiplexes a color signal obtained by quadrature amplitude modulation of the color difference signal with the color subcarrier fsc to a luminance signal to generate a composite signal HM having a signal form similar to that of the current television system. to make.

On the other hand, the auxiliary signal generation unit 16 extracts, based on the luminance signals YP and YP ′, vertical high-frequency components, horizontal high-frequency components, etc. that cannot be transmitted by the letterbox type horizontally long image portion. .. Then, predetermined processing such as time axis compression, time series conversion, and modulation is performed to generate the auxiliary signal HP to be superimposed on the upper and lower non-image area.

The multiplexer 17 multiplexes the composite signal HM and the auxiliary signal HP, and synchronizes the burst signal with the synchronization signal.
A predetermined signal such as an identification signal is added. And D
The / A converter 18 converts the analog signal into an analog signal to generate a letterbox television signal VES (VHS).

Next, a block diagram of an embodiment of the EDTV encoder section 6 is shown in FIG.

Aspect ratio 16: 9, number of scanning lines 525
The image signal VIS of the component of this 2: 1 interlaced scanning is, for example, a color subcarrier fs in the A / D conversion unit 11.
Sampling is performed at a frequency four times that of c to convert it into a digital signal. Then, the YIQ conversion unit 12 performs a predetermined matrix calculation operation to convert the image signal VI into the luminance signal and the color difference I and Q signals (YI of the luminance signal, color difference signal I).
I, QI).

The scanning line conversion unit 19 converts the number of scanning lines, such as 4 to 3 conversion of scanning lines, and converts a signal of 480 effective pixel scanning lines of the image signal VI into a horizontally long image portion of the letterbox system. An image signal VI ′ (luminance signal YI ′, color difference signals II ′, Q) corresponding to 360 effective pixel scanning lines is used.
I ').

The main signal modulator 15 adds and multiplexes a color signal obtained by quadrature amplitude modulation of the color difference signal with the color subcarrier fsc to a luminance signal to generate a composite signal HM having a signal form similar to that of the current television system. to make.

On the other hand, the auxiliary signal generation section 20 extracts, based on the luminance signals YI and YI ', vertical high-frequency components, horizontal high-frequency components, etc. which cannot be transmitted by the letterbox type horizontally long image portion. .. Then, predetermined processing such as time axis compression, time series conversion, and modulation is performed to generate the auxiliary signal HP to be superimposed on the upper and lower non-image area.

The multiplexer 17 multiplexes the composite signal HM and the auxiliary signal HP, and synchronizes the burst signal with the synchronization signal.
A predetermined signal such as an identification signal is added. And D
The / A converter 18 converts the analog signal into an analog signal to generate a letterbox television signal VSS.

Next, FIG. 4 shows an explanatory diagram of signal processing in the scanning line conversion units 13 and 19.

FIG. 3A shows the HD / EDT shown in FIG.
4 of scanning lines in the scanning line conversion unit 13 of the V encoder unit
3 shows signal processing of 3 conversion. The coefficient value k _{1 is} added to the signals of the four scanning lines a, b, c, and d of the image signal VP for progressive scanning,
The k ₂ is weighted and added to generate the signals of the three scanning lines of the scanning lines indicated by the dots, and the 4 to 3 conversion of the number of scanning lines is realized.

On the other hand, FIG. 3B shows the EDT shown in FIG.
4 of scanning lines in the scanning line conversion unit 19 of the V encoder unit
3 shows signal processing of 3 conversion. Coefficient values k ₁ and k ₂ are respectively weighted and added to the signals of the four scanning lines a, b, c and d of the interlaced scanning image signal VI to generate signals of three scanning lines of scanning lines indicated by dots. 4 to 3 conversion of the number of scanning lines is realized. The coefficient value k is set in the first field and the second field of the interlaced scanning so that the image signal VI ′ having the converted number of scanning lines satisfies the relationship of 2: 1 interlaced scanning.
Different values of ₁ and k ₂ are used.

FIG. 5A shows the scanning line conversion units 13 and 19.
FIG. 5B shows the operation of the first embodiment. The input signal YP (YI) and the signal delayed by one scanning line period in the 1H delay circuit 21 are weighted by coefficient weighting circuits 22 with coefficient values k ₁ and k ₂ , respectively, and are added by an adding circuit 23. A 4 to 3 converted scanning line signal is generated.
Then, the scanning line conversion unit 13 writes the signals of three scanning lines for every four scanning lines in the memory circuit 24 in a cycle of one frame period at a rate of the progressive scanning system in 480 scanning line periods. Then, the signal is continuously read in 360 scanning line periods corresponding to the horizontally long image portion region with one frame period as a cycle, and the output signal YP ′ having the number of scanning lines converted is generated.

On the other hand, in the scanning line conversion section 19, at the rate of the interlaced scanning system, one field period is a cycle, and signals of three scanning lines for every four scanning lines in 240 scanning line periods are sent to the memory circuit 2.
Write to 4. Then, the signal is continuously read in 180 scanning line periods corresponding to the horizontally long image portion region in a cycle of one field period, and the output signal YI ′ obtained by performing the scanning line number conversion is generated.

Next, FIG. 6 shows an embodiment of the main signal modulator 15. The LPF circuits 26, 27, and 28 generate a luminance signal Y and color difference signals I and Q, respectively, which are subjected to predetermined frequency band limitation. In the color modulation circuit 29, the color difference signals I, Q
Is quadrature amplitude modulated by the color subcarrier fsc to produce a color signal C. Then, the addition and multiplexing circuit 30 adds the color signal C to the luminance signal Y to generate the composite signal HM.

Next, FIG. 7 shows the auxiliary signal generators 16 and 20.
An example will be shown. This is suitable for generating the auxiliary signal in the form of time division multiplexing. In the high-frequency signal component extraction circuit 31, the high-frequency component in the vertical direction and the high-frequency component in the horizontal direction, which exceed the transmittable band in the horizontally long image portion area, based on the luminance signals YP and YP ′ (YI, YI ′). Is extracted as the signal SHV. In the time axis compression circuit 32, this signal SHV
In order to multiplex in the upper and lower non-picture area in a time division multiplexing manner, for example, processing such as 1/4 compression of the time axis is performed, and a signal SHT whose time axis is compressed to 1/4 is created. The time-series conversion circuit 33 performs a time-series rearrangement process of the signal SHT, and time-series-converts the signal SH into upper and lower non-image areas.
Create T '. In the modulation circuit 34, a predetermined auxiliary signal HP is generated by performing non-linear processing for reducing the influence of noise on the transmission line and the interference with the current receiver.

Next, FIG. 8 shows an embodiment of the auxiliary signal masking processing unit 9. To the selection circuit 36, the letterbox type television signal VLP subjected to the image processing in the current studio equipment section and the signal MSK in which the auxiliary signal components in the upper and lower non-picture area are replaced with zero signals are input. Then, the selection circuit 36 outputs the signal MSK when the control signal SL is at the H level, and outputs the signal VLP when the control signal SL is at the L level. On the other hand, one input of the AND circuit 35 is a signal MSKF of H level during the period of the upper and lower non-image area, and is L level during the other period. In the image processing in which the signal is preserved, the L level signal CTL is input. Therefore,
The output SL of the AND circuit 35 is H during the period of the upper and lower non-image area when image processing in which the auxiliary signal is impaired is performed.
It becomes a level. Then, from the output of the selection circuit 36, a letter box type television signal VS in which the component of the auxiliary signal in the upper and lower non-picture area is zero is generated.

As described above, according to the present embodiment, it is possible to construct a letter box type television signal that can be operated without any problem in program production without being affected by image processing in studio equipment.

Next, another embodiment according to the present invention will be described with reference to FIG.
This will be described with reference to the block diagram shown in FIG.

In the progressive scan image pickup unit 2, for example, the aspect ratio is 16: 9, the number of scanning lines is 525, the frame frequency is twice that of the current television system, and the aspect ratio is 3: 1 in the form of sequential scan.
Primary color signals R, G, B (or luminance signal Y, color difference signal R-
Y, B-Y) component image signal VPS is generated. Then, the HD / EDTV encoder unit 5 performs predetermined letterbox encoding processing such as scanning line number conversion, interlace scanning conversion, color modulation, and auxiliary signal generation, and the number of scanning lines is 525 and 2: 1 interlace. Scanning letterbox type composite color television signal V
Generate ES.

In the HDTV image pickup unit 1, for example, the aspect ratio is 16: 9, the number of scanning lines is 1125, and 30 frames /
Second, 3 primary color signals R in the form of 2: 1 interlaced scanning,
The image signal VH of the component of G, B (or the luminance signal Y, the color difference signals RY, BY) is generated. Then, the down-conversion unit 37 performs scan conversion processing to obtain an image signal V in the form of 525 scanning lines, the same frame frequency as the current television system, and 2: 1 interlaced scanning.
Generates HCI.

In the interlaced scanning image pickup section 3, for example, the aspect ratio is 16: 9 and the number of scanning lines is 525. The three primary color signals R, G, B (or the luminance signal Y, the color difference signals RY, BY) are generated in the same frame frequency as in the current television system and in the form of 2: 1 interlaced scanning.

The EDTV encoder unit 6 performs predetermined letterbox type encoding processing such as scanning line number conversion, color modulation, and auxiliary signal generation, and the number of scanning lines is 525.
A 2: 1 interlaced scanning letterbox type composite color television signal VSS (VHIS) is generated.

In the selection section 7, the signal VES,
Select the corresponding signal of VHIS, VSS and output signal V
Output as L.

In the current studio equipment section 8, the switcher,
Image processing such as DVE, which is necessary for program production in accordance with a control signal from the control unit 10, such as image reduction and expansion,
Processing such as rotation, wipe, and chroma key is performed, and a composite color television signal VLP of the processed image is output.

In the auxiliary signal masking processing unit 9, when image processing is performed by the control signals MSKF and CTL of the control unit 10 so that the auxiliary signal is impaired in the current studio equipment unit, the non-image area above and below the signal VLP is generated. Masking process to replace the component of the auxiliary signal of
A letterbox television signal VS is generated.

As described above, according to the present embodiment, it is possible to construct a letter box type television signal that can be operated without any problem in program production without being affected by image processing in studio equipment.

[0052]

According to the present invention, when performing image processing in which the auxiliary signal is impaired in studio equipment, the component of the auxiliary signal is replaced with a signal of zero to form a letterbox type television signal. Therefore, it becomes possible to construct a letter box type television signal that can be operated without any problem in program production without being affected by image processing in studio equipment.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an HD / EDTV encoder unit according to the first embodiment.

FIG. 3 is a configuration diagram of an EDTV encoder unit.

FIG. 4 is a configuration diagram of a scanning line conversion unit.

FIG. 5 is an explanatory diagram of signal processing of a scanning line conversion unit.

FIG. 6 is a block configuration diagram of a main signal modulation unit.

FIG. 7 is a block configuration diagram of a correction signal generation unit.

FIG. 8 is a configuration diagram of a masking processing unit of a correction signal generation unit.

FIG. 9 is a block configuration diagram of a second embodiment of the present invention.

[Explanation of symbols]

1 ... HDTV image pickup unit, 2 ... progressive scan image pickup unit, 3 ... interlaced scan image pickup unit, 4 ... progressive scan conversion unit, 5 ... HD / E
DTV encoder section, 6 ... EDTV encoder section, 7 ...
Selection unit, 8 ... Current studio equipment unit, 9 ... Auxiliary signal masking processing unit, 10 ... Control unit, 11 ... A / D conversion unit, 12
... YIQ converter, 13 ... Scan line converter, 14 ... Interlace converter, 15 ... Main signal modulator, 16 ... Auxiliary signal generator, 17 ... Multiplexer, 18 ... D / A converter, 19 ... Scan line Conversion unit, 20 ... auxiliary signal generation unit, 21 ... 1H delay circuit,
22 ... Coefficient weighting circuit, 23 ... Addition circuit, 24 ... Memory circuit, 25 ... Control circuit, 26, 27, 28 ... LPF circuit,
29 ... Color modulation circuit, 30 ... Addition multiplex circuit, 31 ... High-frequency signal component extraction circuit, 32 ... Time axis compression circuit, 33 ... Time series conversion circuit, 34 ... Modulation circuit, 35 ... AND circuit, 36 ...
Selection circuit, 37 ... Down conversion section.

Claims (3)

[Claims] 1. A method of constructing a television signal of a letterbox system, wherein a horizontally long image having a horizontally long aspect ratio different from that of the current television system is transmitted by providing non-image areas on the upper and lower sides of a screen. Means for generating the first television signal of the letterbox system from the image signal of the component form having the horizontal aspect ratio different from that of the image signal of the horizontal aspect ratio of the same scan mode as the current television system A means for generating a letterbox-type second television signal, and a television signal obtained by subjecting the first and second television signals to a selected and output television signal in accordance with a material in current studio equipment. A television signal in which the components of the auxiliary signal superimposed on the upper and lower non-picture areas are replaced with zero signals A means for generating is provided, and in the case of image processing in which the signal processing in the current studio equipment impairs the auxiliary signal, a television signal in which the component of the auxiliary signal is replaced with a signal of zero is used as a letterbox type television signal. A method for constructing a television signal, comprising: 2. The image signal of a component form having a horizontally long aspect ratio in a scanning form different from the current television system is 1125 scanning lines, aspect ratio 16: 9, 30 frames / sec, 2: 1. The method for constructing a television signal according to claim 1, wherein the method is in the form of interlaced scanning. 3. The image signal of a component form having a horizontally long aspect ratio in a scanning form different from that of the current television system includes the number of scanning lines of 525, the aspect ratio of 16: 9, and twice that of the current television system. Frame frequency,
The method for constructing a television signal according to claim 1, wherein the method is in the form of 1: 1 progressive scanning.