JP2001346168A - Image signal conversion system and method, recording medium, and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image signal conversion method by which occurrence of a difference from line numbers between fields of a converted HD signal can be suppressed. SOLUTION: Whether or not an SD signal received by the image conversion system of this invention is a standard signal in compliance with the NTSC standards is discriminated on the basis of a discrimination signal received from a three-dimensional YC separation device in a step S1. In the case that the received SD signal is discriminated to be the standard signal, a standard system is decided for the synchronization system in a step S2. On the contrary, in the case that the received SD signal is discriminated to be no standard signal in the step S1, a non-standard system is decided for the synchronization system in a step S3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal converting apparatus and method, a recording medium, and a television receiver. For example, the present invention relates to a television receiver and an image signal suitable for use when converting an SD signal into an HD signal. The present invention relates to a signal device and method, a recording medium, and a television receiver.

[0002]

2. Description of the Related Art For example, a display corresponding to a high-quality image signal (hereinafter, referred to as an HD (High Definition) signal) broadcast in a high-definition broadcast or the like is provided with a conventional image signal (hereinafter, referred to as a terrestrial broadcast). SD (Standerd Definitio
n) Described as a signal)
It is necessary to convert an SD signal into an HD signal.

FIG. 1 shows an example of the configuration of a system that converts an input SD signal into an HD signal and outputs it. In the system, an input SD signal is converted into a double-speed signal by a double-speed conversion device 1 and converted into an HD signal by a pixel number conversion device 2.

[0004]

The SD signal input to the system is, for example, NTSC (National Television).
In the case of a signal conforming to the sion system committee standard, the scanning is interlaced (interlaced scanning), and the scanning lines of one frame are 525 lines. Therefore, the period of the vertical synchronization signal (hereinafter, abbreviated as V sync) is 262.5 lines in both the first field and the second field as shown in FIG.

When such an SD signal is converted into a double-speed signal by the double-speed converter 1, the number of scanning lines in one frame is set to 105.
In order to maintain the interlace method, as shown in FIG. 2B, the cycle of the V sync of the double speed signal is set to 523.5 lines in the first field, and to 526.times. In the second field. It is necessary to generate a fraction of 0.5 line in the period of the V sync of the first and second fields so as to make five lines (the first field is 524.5 lines, and the second field is 525.5 lines). May be used).

Next, the pixel number converter 2 scans one frame of a double-speed signal output from the double-speed converter 1 and having a different period between the V sync of the first field and the V sync of the second field. The line is converted to an HD signal with 1125 lines. At this time, unless special measures are taken,
The cycle of the V sync of the obtained HD signal is, for example, as shown in FIG.
As shown in (C), the number of lines in the first field and the V in the second field are set so that the first field has 560.5 lines and the second field has 564.5 lines.
The sync cycle will be different.

Therefore, when the obtained HD signal is displayed on a display, there is a problem that the intervals between the scanning lines are different between the first field and the second field.

The present invention has been made in view of such a situation, and when converting an SD signal into an HD signal, the difference between the number of lines in the first field and the number of lines in the second field of the obtained HD signal. It is an object of the present invention to be able to suppress the occurrence of the problem.

[0009]

According to the present invention, there is provided an image signal converting apparatus, comprising: a judging means for judging whether or not an SD signal conforms to a predetermined standard; A conversion unit that converts the signal into a signal, a generation unit that generates an HD signal by interpolating a pixel of the double-speed signal, and an output unit that outputs a vertical synchronization signal of the HD signal based on a vertical synchronization signal of the double-speed signal, The output unit changes a synchronization method for outputting a vertical synchronizing signal of the HD signal in accordance with a result of the determination by the determination unit.

When the judging means judges that the SD signal conforms to a predetermined standard, the output means delays the vertical synchronizing signal of the HD signal by a predetermined delay amount from the vertical synchronizing signal of the double speed signal. , And thereafter, a vertical synchronizing signal of the HD signal is output at predetermined time intervals.

When the phase difference between the vertical synchronizing signal of the double speed signal and the vertical synchronizing signal of the HD signal is larger than a threshold value, the output means corrects the phase of the vertical synchronizing signal of the HD signal by one line per field. You can make it.

When the determination means determines that the SD signal does not conform to a predetermined standard, the output means outputs H which is delayed by a predetermined delay amount for each vertical synchronization signal of the double speed signal.
A vertical synchronizing signal of the D signal can be output.

The determining means may be a three-dimensional YC separation device.

[0014] The determination means includes a step for determining the SD based on the phase difference between the vertical synchronizing signal of the double speed signal and the vertical synchronizing signal of the HD signal.
It may be determined whether the signal complies with a predetermined standard.

The image signal converting method according to the present invention includes a determining step of determining whether the SD signal conforms to a predetermined standard, and a converting step of multiplying the number of scanning lines of the SD signal by a constant to convert the SD signal into a double-speed signal. And a generation step of generating an HD signal by interpolating pixels of the double-speed signal; and an output step of outputting a vertical synchronization signal of the HD signal based on the vertical synchronization signal of the double-speed signal. The method is characterized in that a synchronization method for outputting a vertical synchronization signal of an HD signal is changed in accordance with a result of the determination in the determination step.

The program of the recording medium according to the present invention includes a judging step for judging whether or not the SD signal conforms to a predetermined standard, and a converting step for multiplying the number of scanning lines of the SD signal by a constant to convert it into a double speed signal. And interpolating the pixel of the double speed signal to obtain H
A generating step of generating a D signal; and an output step of outputting a vertical synchronizing signal of an HD signal based on the vertical synchronizing signal of the double speed signal, wherein the output step corresponds to the judgment result in the judging step. Then, the synchronization method for outputting the vertical synchronization signal of the HD signal is changed.

The television receiver according to the present invention comprises: a judging means for judging whether or not an SD signal conforms to a predetermined standard; and a converting means for multiplying the number of scanning lines of the SD signal by a constant to convert to a double-speed signal. Generating means for generating an HD signal by interpolating pixels of the double-speed signal; and output means for outputting a vertical synchronizing signal of the HD signal based on the vertical synchronizing signal of the double-speed signal. Corresponding to the judgment result of HD
A synchronization method for outputting a vertical synchronization signal of a signal is changed.

In the image signal conversion device and method of the present invention, and the program of the recording medium, it is determined whether or not the SD signal conforms to a predetermined standard. Also, SD
The number of scanning lines of the signal is multiplied by a constant to be converted into a double-speed signal, pixels of the double-speed signal are interpolated to generate an HD signal, and a vertical synchronization signal of the HD signal is output based on the vertical synchronization signal of the double-speed signal. . Furthermore, the synchronization method for outputting the vertical synchronization signal of the HD signal is changed according to the determination result.

In the television receiver of the present invention,
It is determined whether the SD signal conforms to a predetermined standard. Further, the number of scanning lines of the SD signal is multiplied by a constant to be converted into a double-speed signal, pixels of the double-speed signal are interpolated to generate an HD signal, and a vertical synchronizing signal of the HD signal is generated based on the vertical synchronizing signal of the double-speed signal. Is output. Furthermore, the synchronization method for outputting the vertical synchronization signal of the HD signal is changed according to the determination result.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A configuration example of an image conversion system to which the present invention is applied will be described with reference to FIG. This image conversion system converts an input SD signal into an HD signal.

This image conversion system comprises a three-dimensional YC separation device 11, a double speed conversion device 12, a pixel number conversion device 13, and a control device 14.

The three-dimensional YC separation device 11 receives the input S
The D signal is YC-separated and output to the double speed converter 12. Three
The dimensional YC separation device 11 also converts the input SD signal into
Either a standard signal (525i (interlace) of a television broadcast signal) conforming to the NTSC standard or a non-standard signal not conforming to the NTSC standard (for example, a 262p signal such as a home video game signal).
(Progressive)), and outputs a determination signal indicating the determination result to the control device 14.

The double speed converter 12 converts the input SD signal into a double speed signal and outputs it to the pixel number converter 13 in the same manner as the double speed converter 1 of FIG. Pixel number converter 13
Converts the double-speed signal input from the double-speed conversion device 12 into an HD signal, and outputs the HD signal according to the synchronization method specified by the control device 14.

The control device 14 controls the drive 15 to read a control program stored in the magnetic disk 16, the optical disk 17, the magneto-optical disk 18, or the semiconductor memory 19, and based on the read control program. , And controls each device of the image conversion system. For example, the control device 14 determines the synchronization method in the image number conversion device 13 according to the determination signal from the three-dimensional YC separation device 11.

The synchronization method determining process of the control device 14 will be described with reference to the flowchart of FIG. This synchronization method determination processing is repeatedly executed while the image conversion system operates.

In step S1, the control device 14
Based on the determination signal input from the three-dimensional YC separation device 11, the SD signal input to the image conversion system is NTSC
It is determined whether or not the signal is a standard signal conforming to the standard. If it is determined that the input SD signal is a standard signal, the process proceeds to step S2. In step S2, the control device 1
No. 4 determines the synchronization method as a standard method and notifies the pixel number conversion device 13. In response to this notification, the pixel number conversion device 13 outputs the V sync of the converted HD signal by a standard method (details will be described later).

If it is determined in step S1 that the input SD signal is not a standard signal, the process proceeds to step S3. In step S3, the control device 14
Determines the synchronization method to be a non-standard method and notifies the pixel number conversion device 13. In response to this notification, the pixel number conversion device 13 outputs the V sync of the converted HD signal in a non-standard manner (details will be described later).

FIG. 5 shows a synchronization method in the pixel number conversion device 13 when the input SD signal is a standard signal (525i) conforming to the NTSC standard.

When a standard SD signal is input, the V-sync cycle of the double-speed signal output from the double-speed converter 12 differs between the first field and the second field as shown in FIG. , 523.5h and 526.5h are alternately repeated. Here, h is 1 in the double speed signal.
It indicates the time corresponding to the line.

In this case, in the pixel number conversion device 13, FIG.
As shown in (B), the phase A of the input double-speed signal is detected, and a V sync of the HD signal is generated at a phase A ′ delayed from the phase A by a fixed delay α. A V sync is also generated in the phase B 'delayed by 562.5H. Here, H indicates a time corresponding to one line in the HD signal.

Here, the phase B 'of the V sync of the HD signal
Is further shifted by 3 h in addition to the fixed delay α with respect to the phase B of the V-sync of the double speed signal. However, the field frequency of the input double speed signal and the field frequency of the output HD signal are PLL (Phase Locked).
Loop), the shift amount (in this case, 3h) becomes a predetermined threshold value (for example, 3h).
h) If it is less than or equal to the value, the shift amount can be neglected, and the next phase C ′ is delayed from the phase C by a fixed delay α.

Therefore, since the phase C and the phase C 'are the same as the relationship between the phase A and the phase A', a V sync of the HD signal is generated at the phase C 'and the phase C' Vsync may be generated even in the phase D ′ delayed by 562.5H from the phase D ′. Thereafter, if there is no change in the V-sync cycle of the input double-speed signal, the same operation may be repeated.

However, if the amount of deviation other than the fixed delay α from the phase X of the V-sync of the V-sync of the HD signal with respect to the phase X of the V-sync is larger than a predetermined threshold value, the number of lines in the continuous field greatly changes. By,
To prevent the difference between the scanning lines from increasing,
The minimum unit is 1H per field.

In the case where the period of the V sync of the standard double-speed signal inputted changes between the phase D and the phase E in FIG. 5A due to channel switching or the like. Waits for the phase F of the next input double-speed signal,
The above processing may be repeated. That is, a V sync of the HD signal is generated at a phase F ′ delayed by a fixed delay α from the phase F, and the 562.
It is sufficient to generate the V sync even in the phase G 'delayed by 5H.

When the input SD signal is a non-standard signal that does not conform to the NTSC standard, the above-described synchronization method when a standard SD signal is input cannot be applied.

The reason is that the field frequency of the non-standard double-speed signal is shifted by 29.97 × (1/525) Hz as compared with the field frequency of the standard double-speed signal described above. The frequency at which the shift can be adjusted by 13 is 1H per field, that is, 29.97 × (1 / 562.5) Hertz,
This is because it is impossible to catch up even if the deviation is adjusted by 1H per field.

FIG. 6 shows a synchronization method in the pixel number converter 13 when the input SD signal is a non-standard signal (262p) not conforming to the NTSC standard. FIG.
(A) shows the V-sync cycle of the double-speed signal output from the double-speed conversion device 12 when a non-standard SD signal is input. As shown in FIG. 6A, the first field and the second field
524h is common to all fields. Note that the double speed signal is a 524p progressive signal.

In this case, in the pixel number conversion device 13, FIG.
As shown in (B), the phase of the input double-speed signal is detected, and the generation of the V-sync of the HD signal is repeated at a phase A ′ delayed from the phase A by a fixed delay α.

As described above, according to the image conversion system of the present embodiment, when the input SD signal is a standard signal, one pulse of the V-sync of the double-speed signal from the double-speed conversion device 12 is used as a trigger. , And thereafter, at regular intervals (56
When the input SD signal is a non-standard signal so that the V signal of the HD signal is output at 2.5H), a fixed delay is applied to each pulse of the V sync of the double-speed signal from the double-speed conversion device 12 for each pulse. Since the V-sync of the HD signal that is delayed only by the delay is output, the occurrence of the difference between the number of lines in the first field and the number of lines in the second field of the output HD signal is suppressed.

Instead of changing the synchronization method in response to the determination signal from the three-dimensional YC separation device 11, for example, the V-sync of the double-speed signal input to the pixel number conversion device 13 and the output of the HD signal The V-syncs are compared, and if the phase of the V-sync of the double-speed signal and the V-sync of the HD signal are not shifted by a predetermined amount or more, it is determined that the SD signal input to the image conversion system is a standard signal, When the phase of the V sync of the signal and the phase of the V sync of the HD signal are shifted by a predetermined amount or more, it is determined that the SD signal input to the image conversion system is a non-standard signal, and the synchronization method is switched. You may.

Further, in the present embodiment, the SD signal conforming to the NTSC standard is processed as a standard signal, and the SD signal not conforming to the NTSC standard is processed as a non-standard signal. Other television standards (PAL, S
The present invention can also be applied to a case where an SD signal of the ECAM system is used as a standard signal.

The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software can execute various functions by installing a computer built into dedicated hardware or installing various programs. It is installed from a recording medium into a possible general-purpose personal computer or the like.

As shown in FIG. 3, the recording medium is a magnetic disk 16 (including a floppy disk) on which the program is recorded and an optical disk 17 which are distributed separately from a computer to provide the user with the program.
(CD-ROM (Compact Disc-Read Only Memory), DVD (Digit
al Versatile Disc), magneto-optical disc 18 (M
D (including Mini Disc)) or a packaged medium including a semiconductor memory 19 and the like, which is provided to the user in a state in which it is incorporated in a computer in advance, and a ROM or a hard disk in which a program is recorded. It consists of.

In this specification, the system is
It represents the entire device composed of a plurality of devices.

[0045]

As described above, according to the image signal conversion apparatus and method of the present invention and the program of the recording medium,
It is determined that the SD signal conforms to a predetermined standard, and the synchronization method for outputting the vertical synchronization signal of the HD signal is changed according to the determination result.
It is possible to suppress the occurrence of a difference between the number of lines in the field and the number of lines in the second field.

Further, according to the television receiver of the present invention, it is determined that the SD signal conforms to the predetermined standard, and the synchronization for outputting the vertical synchronization signal of the HD signal is determined in accordance with the determination result. Since the method is changed, it is possible to suppress the occurrence of a difference between the number of lines in the first field and the number of lines in the second field of the HD signal.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a configuration of a conventional image conversion system.

FIG. 2 is a diagram for explaining an operation of a conventional image conversion system.

FIG. 3 is a block diagram illustrating a configuration example of an image conversion system according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a synchronization method determination process of the control device 14.

FIG. 5 is a diagram illustrating a case where a standard SD signal is input;
FIG. 3 is a diagram for explaining a method of synchronizing a V sync of a D signal.

FIG. 6 illustrates a case where a non-standard SD signal is input.
FIG. 3 is a diagram for explaining a method of synchronizing a V sync of an HD signal.

[Explanation of symbols]

11 3D YC separation device, 12x speed converter,
13 pixel number converter, 14 controller, 16 magnetic disk, 17 optical disk, 18 magneto-optical disk, 19 semiconductor memory

Claims (16)

[Claims] 1. An image signal conversion apparatus for converting an SD signal into an HD signal, comprising: a determination unit for determining whether or not the SD signal conforms to a predetermined standard; Conversion means for converting the signal into a double-speed signal; generating means for interpolating pixels of the double-speed signal to generate the HD signal; and outputting a vertical synchronization signal of the HD signal based on a vertical synchronization signal of the double-speed signal. Output means, the output means corresponding to the determination result of the determination means,
An image signal conversion apparatus, wherein a synchronization method for outputting a vertical synchronization signal of the HD signal is changed. 2. When the determining means determines that the SD signal conforms to the predetermined standard, the output means delays the vertical synchronizing signal of the double speed signal by a predetermined delay amount. 2. The image signal conversion device according to claim 1, wherein the vertical synchronization signal of the HD signal is output, and thereafter, the vertical synchronization signal of the HD signal is output at predetermined time intervals. 3. When the phase difference between the vertical synchronizing signal of the double speed signal and the vertical synchronizing signal of the HD signal is larger than a threshold value, the output means sets the phase of the vertical synchronizing signal of the HD signal to 1 3. The image signal conversion device according to claim 2, wherein the correction is performed one line per field. 4. When the determination means determines that the SD signal does not conform to the predetermined standard, the output means delays by a predetermined delay amount for each vertical synchronization signal of the double speed signal. The image signal conversion device according to claim 1, wherein the vertical synchronization signal of the HD signal is output. 5. The image signal conversion device according to claim 1, wherein said determination means is a three-dimensional YC separation device. 6. The determination means determines whether or not the SD signal complies with the predetermined standard based on the phase difference between the vertical synchronization signal of the double speed signal and the vertical synchronization signal of the HD signal. The image signal conversion device according to claim 1, wherein the determination is performed. 7. The image signal conversion apparatus according to claim 1, wherein the predetermined standard is an NTSC standard. 8. An image signal conversion method for an image signal conversion apparatus for converting an SD signal into an HD signal, comprising: a step of determining whether the SD signal conforms to a predetermined standard; and a step of scanning the SD signal. A conversion step of multiplying the number of lines by a constant to convert the signal into a double-speed signal; a generation step of interpolating the pixels of the double-speed signal to generate the HD signal; And an output step of outputting a vertical synchronization signal. In the processing of the output step, a synchronization method for outputting a vertical synchronization signal of the HD signal is changed in accordance with a determination result in the processing of the determination step. An image signal conversion method characterized in that: 9. An image signal conversion program for converting an SD signal into an HD signal, comprising: a determination step of determining whether the SD signal conforms to a predetermined standard; and a scanning line of the SD signal. A conversion step of multiplying the number by a constant to convert it into a double-speed signal; a generation step of interpolating the pixels of the double-speed signal to generate the HD signal; And an output step of outputting a synchronization signal. In the processing of the output step, a synchronization method for outputting a vertical synchronization signal of the HD signal is changed in accordance with a result of the determination in the processing of the determination step. A recording medium on which a computer-readable program is recorded. 10. A television receiver for converting an SD signal into an HD signal and displaying the converted signal, wherein: a determination unit for determining whether the SD signal conforms to a predetermined standard; Conversion means for multiplying the signal by a constant to convert the signal into a double-speed signal; generating means for interpolating pixels of the double-speed signal to generate the HD signal; and vertical synchronization of the HD signal based on a vertical synchronization signal of the double-speed signal. Output means for outputting a signal, the output means corresponding to the determination result of the determination means,
A television receiver, wherein a synchronization method for outputting a vertical synchronization signal of the HD signal is changed. 11. When the determination means determines that the SD signal conforms to the predetermined standard, the output means delays the vertical synchronization signal of the double speed signal by a predetermined delay amount. The television receiver according to claim 10, wherein the vertical synchronization signal of the HD signal is output, and thereafter, the vertical synchronization signal of the HD signal is output at predetermined time intervals. 12. When the phase difference between the vertical synchronizing signal of the double speed signal and the vertical synchronizing signal of the HD signal is larger than a threshold value, the output means sets the phase of the vertical synchronizing signal of the HD signal to 1 The television receiver according to claim 11, wherein the correction is performed for one line per field. 13. When the determination means determines that the SD signal does not conform to the predetermined standard, the output means delays by a predetermined delay amount for each of the vertical synchronizing signals of the double speed signal. The television receiver according to claim 10, wherein the vertical synchronization signal of the HD signal is output. 14. The television receiver according to claim 10, wherein said determination means is a three-dimensional YC separation device. 15. The determination means determines whether or not the SD signal conforms to the predetermined standard based on the phase difference between the vertical synchronization signal of the double speed signal and the vertical synchronization signal of the HD signal. The television receiver according to claim 10, wherein the determination is performed. 16. The television receiver according to claim 10, wherein the predetermined standard is an NTSC standard.