JP4257561B2 - Image signal converting apparatus and method, recording medium, and television receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image signal conversion apparatus and method, a recording medium, and a television receiver. For example, a television receiver, an image signal apparatus and method, and a recording medium that are suitable for use when converting an SD signal into an HD signal. And a television receiver.
[0002]
[Prior art]
For example, a display that supports high-quality image signals (hereinafter referred to as HD (High Definition) signals) that are broadcast in high-definition broadcasts, etc., and conventional terrestrial broadcast image signals (hereinafter referred to as SD (Standered Definition)). ) Signal), the SD signal needs to be converted into an HD signal.
[0003]
FIG. 1 shows a configuration example of a system that converts an input SD signal into an HD signal and outputs the HD signal. In this system, an input SD signal is converted into a double speed signal by the double speed converter 1 and converted into an HD signal by the pixel number converter 2.
[0004]
[Problems to be solved by the invention]
By the way, when the SD signal input to the system is, for example, a signal conforming to the NTSC (National Television System Committee) standard, the scanning is interlaced (interlaced scanning), and the scanning line of one frame is 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.
[0005]
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 1050 lines. However, in order to maintain the interlace method, as shown in FIG. The period of the V sync of the double-speed signal is 523.5 lines in the first field and 526.5 lines in the second field, and the fraction of 0.5 lines in the V sync period of the first and second fields (The first field may be 524.5 lines and the second field may be 525.5 lines).
[0006]
Next, in the pixel number conversion device 2, the 1-line scanning line 1125 outputs a double-speed signal output from the double-speed double conversion device 1 and having a V-sync cycle of the first field and a V-sync cycle of the second field different from each other. The HD signal is converted into an HD signal which is a line. At this time, unless special measures are taken, the V-sync cycle of the obtained HD signal is 560.5 lines in the first field as shown in FIG. 2C, for example. Thus, the number of lines in the first field and the cycle of V sync in the second field are different so that the second field has 564.5 lines.
[0007]
Therefore, when the obtained HD signal is displayed on the display, there is a problem that the interval between the scanning lines is different between the first field and the second field.
[0008]
The present invention has been made in view of such a situation. When an SD signal is converted into an HD signal, a difference between the number of lines in the first field and the number of lines in the second field of the obtained HD signal is generated. The purpose is to enable deterrence.
[0009]
[Means for Solving the Problems]
An image signal conversion apparatus according to the present invention includes a determination means for determining whether or not an SD signal conforms to a predetermined television broadcast signal standard , and a conversion for multiplying the number of scanning lines of the SD signal by a constant to convert it to a double speed signal. means, generating means for generating HD signal by interpolating the pixels of the double-speed signal, based on the vertical synchronizing signal of the speed signal, and an output means for outputting a vertical synchronizing signal of the HD signal, output means, SD When it is determined that the signal conforms to a predetermined television broadcast signal standard, the vertical synchronizing signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronizing signal of the double speed signal, and thereafter for a predetermined time. When a vertical synchronizing signal of HD signal is output at every interval and it is determined that the SD signal does not conform to a predetermined television broadcast signal standard, the vertical synchronizing signal of the double speed signal is delayed by a predetermined delay amount. HD Shin The vertical sync signal of the signal is output.
[0010]
The image signal conversion method of the present invention includes a determination step for determining whether an SD signal conforms to a predetermined television broadcast signal standard, and a conversion for converting the number of scanning lines of the SD signal to a double speed signal by multiplying by a constant. A 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. When it is determined that the signal conforms to a predetermined television broadcast signal standard, the vertical synchronizing signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronizing signal of the double speed signal, and thereafter for a predetermined time. When a vertical synchronizing signal of HD signal is output at every interval and it is determined that the SD signal does not conform to a predetermined television broadcast signal standard, a predetermined delay amount is set for each vertical synchronizing signal of a double speed signal. Only outputs the vertical synchronizing signal of the HD signal obtained by delaying.
[0011]
The recording medium of the present invention includes a determination step for determining whether an SD signal conforms to a predetermined television broadcast signal standard, and a conversion step for converting the number of scanning lines of the SD signal into a double speed signal by multiplying by a constant. , Generating a HD signal by interpolating the pixels of the double speed signal, and outputting an HD signal vertical synchronization signal based on the vertical speed signal vertical synchronization signal. When it is determined that the video signal conforms to a predetermined television broadcast signal standard, the vertical sync signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical sync signal of the double speed signal, and thereafter every predetermined time interval. When the vertical sync signal of the HD signal is output to the SD signal and it is determined that the SD signal does not conform to the predetermined television broadcast signal standard, the vertical delay signal is delayed by a predetermined delay amount for each vertical sync signal of the double-speed signal. Program for executing a process of outputting a vertical synchronizing signal of the HD signal obtained in the computer of the image converter is recorded.
[0012]
The television receiver of the present invention includes a determination means for determining whether or not an SD signal is compliant with a predetermined television broadcast signal standard, and a conversion for multiplying the number of scanning lines of the SD signal by a constant to convert it to a double speed signal. Means for generating an HD signal by interpolating the pixels of the double speed signal, and an output means for outputting the vertical synchronization signal of the HD signal based on the vertical synchronization signal of the double speed signal. When it is determined that the signal conforms to a predetermined television broadcast signal standard, the vertical synchronizing signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronizing signal of the double speed signal, and thereafter for a predetermined time. When a vertical synchronizing signal of HD signal is output at every interval and it is determined that the SD signal does not conform to a predetermined television broadcast signal standard, the vertical synchronizing signal of the double speed signal is delayed by a predetermined delay amount. HD And it outputs the No. of the vertical synchronization signal.
[0013]
In the present invention, it is determined whether or not the SD signal conforms to a predetermined television broadcast signal standard, the SD signal is converted into a double-speed signal by multiplying the number of scanning lines by a constant, and pixels of the double-speed signal are interpolated. Thus, an HD signal is generated, and the vertical synchronization signal of the HD signal is output based on the vertical synchronization signal of the double speed signal. If it is determined that the SD signal conforms to a predetermined television broadcast signal standard, the vertical synchronizing signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronizing signal of the double speed signal. A vertical synchronizing signal of the HD signal is output at predetermined time intervals. On the other hand, when it is determined that the SD signal does not conform to a predetermined television broadcast signal standard, an HD signal vertical synchronization signal delayed by a predetermined delay amount is output for each vertical speed signal vertical synchronization signal. The
[0020]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0021]
This image conversion system includes a three-dimensional YC separation device 11, a double speed conversion device 12, a pixel number conversion device 13, and a control device 14.
[0022]
The three-dimensional YC separator 11 performs YC separation on the input SD signal and outputs it to the double speed converter 12. The three-dimensional YC separation device 11 is also configured such that the input SD signal is a standard signal conforming to the NTSC standard (525i (interlace) of a television broadcast signal) or a non-standard signal that does not conform (for example, a home television set). It is determined whether the game signal or the like is 262p (progressive), and a determination signal indicating the determination result is output to the control device 14.
[0023]
The double speed conversion device 12 converts the input SD signal into a double speed signal and outputs it to the pixel number conversion device 13 in the same manner as the double speed conversion device 1 of FIG. The pixel number conversion device 13 converts the double speed signal input from the double speed conversion device 12 into an HD signal, and outputs the HD signal in accordance with a synchronization method designated by the control device 14.
[0024]
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 performs image conversion based on the read control program. Control each device in the system. For example, the control device 14 determines the synchronization method in the image number conversion device 13 in response to the determination signal from the three-dimensional YC separation device 11.
[0025]
The synchronization method determination process of the control device 14 will be described with reference to the flowchart of FIG. This synchronization method determination process is repeatedly executed while the image conversion system operates.
[0026]
In step S1, the control device 14 determines based on the determination signal input from the three-dimensional YC separation device 11 whether the SD signal input to the image conversion system is a standard signal compliant with the NTSC standard. . If it is determined that the input SD signal is a standard signal, the process proceeds to step S2. In step S <b> 2, the control device 14 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 a V sync of the converted HD signal by a standard method (details will be described later).
[0027]
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 S <b> 3, the control device 14 determines the synchronization method as a non-standard method and notifies the pixel number conversion device 13. In response to this notification, the pixel number conversion device 13 outputs a V sync of the converted HD signal by a non-standard method (details will be described later).
[0028]
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.
[0029]
When a standard SD signal is input, the cycle of the V sync of the double speed signal output from the double speed converter 12 is different between the first field and the second field as shown in FIG. 5h and 526.5h are repeated alternately. Here, h represents a time corresponding to one line in the double speed signal.
[0030]
In this case, as shown in FIG. 5B, the pixel number conversion device 13 detects the phase A of the input double speed signal, and outputs the HD signal at the phase A ′ delayed from the phase A by a fixed delay α. V sync is generated, and V sync is also generated in phase B ′ delayed by 562.5H from phase A ′. However, H represents a time corresponding to one line in the HD signal.
[0031]
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, since the field frequency of the input double speed signal and the field frequency of the output HD signal are completely matched by a PLL (Phase Locked Loop), the deviation amount (3h in this case) is predetermined. Is equal to or less than the threshold value (for example, 3h), the shift amount can be ignored, and the next phase C ′ is a delay of the phase C by a fixed delay α.
[0032]
Therefore, since the phase C and the phase C ′ are the same as the relationship between the phase A and the phase A ′, the V sync of the HD signal is generated in the phase C ′ and the phase C ′ to 562. V sync may be generated even in the phase D ′ delayed by 5H. Thereafter, if there is no change in the cycle of the V sync of the input double speed signal, the same may be repeated.
[0033]
However, when the shift amount other than the fixed delay α with respect to the phase X of the V sync of the double-speed signal of the V sync phase X ′ of the HD signal is larger than a predetermined threshold, the number of lines in the continuous field greatly changes. In order to prevent the difference between the scanning line intervals from increasing, the minimum unit of 1H is adjusted per field.
[0034]
When a change occurs in the V sync cycle of the input standard double speed signal, such as between phase D and phase E in FIG. The process described above may be repeated after waiting for the phase F of the double speed signal to be input next. That is, the V sync of the HD signal is generated at the phase F ′ delayed from the phase F by the fixed delay α, and the V sync is also generated at the phase G ′ delayed by 562.5H from the phase F ′. do it.
[0035]
By the way, when the SD signal to be input is a non-standard signal that does not conform to the NTSC standard, the above-described synchronization method when the standard SD signal is input cannot be applied.
[0036]
This is because the field frequency of the non-standard double speed signal is shifted by 29.97 × (1/525) hertz as compared with the field frequency of the standard double speed signal described above, but is shifted by the pixel number converter 13. This is because the frequency that can be adjusted is 1H per field, that is, 29.97 × (1 / 562.5) hertz, and even if the shift is adjusted by 1H per field, it cannot be caught up.
[0037]
FIG. 6 shows a synchronization method in the pixel number conversion device 13 when the input SD signal is a non-standard signal (262p) that does not conform to the NTSC standard. FIG. 6A shows the V sync cycle of the double speed signal output from the double speed converter 12 when a non-standard SD signal is input. As shown in FIG. 6A, 524h is common to the first field and the second field. The double speed signal is a 524p progressive signal.
[0038]
In this case, as shown in FIG. 6B, the pixel number conversion device 13 detects the phase of the input double-speed signal, and in the phase A ′ delayed from the phase A by a fixed delay α, Repeat the generation of the sync.
[0039]
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 converter 12 is used as a trigger, and thereafter When the input SD signal is a non-standard signal so that the V sync of the HD signal is output at a constant interval (562.5H), the V sync of the double speed signal from the double speed converter 12 is Since the V sync of the HD signal delayed by a fixed delay is output to the pulse, 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.
[0040]
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 inputted in the pixel number conversion device 13 and the V sync of the HD signal to be outputted are changed. In comparison, if the phase of the V sync of the double speed signal and the V sync of the HD signal is 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, and the V speed of the double speed signal is determined. When the phase of the sync and the V sync of the HD signal shifts 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 may be switched. .
[0041]
In this embodiment, an SD signal that conforms to the NTSC standard is processed as a standard signal, and a non-compliant SD signal is processed as a non-standard signal. The present invention can also be applied to a case where an SD signal of John standard (PAL standard, SECAM system) is used as a standard signal.
[0042]
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 may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a recording medium in a general-purpose personal computer or the like.
[0043]
As shown in FIG. 3, the recording medium is distributed to provide a program to the user separately from the computer, and includes a magnetic disk 16 (including a floppy disk) on which the program is recorded, an optical disk 17 (CD- It is not only composed of a package medium composed of ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc)), magneto-optical disk 18 (including MD (Mini Disc)), or semiconductor memory 19. It is configured by a ROM, a hard disk or the like on which a program is recorded, which is provided to the user in a state of being pre-installed in the computer.
[0044]
Further, in this specification, the system represents the entire apparatus constituted by a plurality of apparatuses.
[0045]
【The invention's effect】
As described above, according to this onset bright, it is possible to suppress the occurrence of the first line number and the line number of the difference between the second field of the field H D 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 the 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 for explaining a method of synchronizing the V sync of the HD signal when a standard SD signal is input.
FIG. 6 is a diagram for explaining a method of synchronizing the V sync of the HD signal when a non-standard SD signal is input.
[Explanation of symbols]
11 three-dimensional YC separation device, 12 double speed conversion device, 13 pixel number conversion device, 14 control device, 16 magnetic disk, 17 optical disk, 18 magneto-optical disk, 19 semiconductor memory

Claims (10)

In an image signal converter for converting an SD signal into an HD signal,
Determining means for determining whether or not the SD signal conforms to a predetermined television broadcast signal standard ;
Conversion means for multiplying the number of scanning lines of the SD signal by a constant and converting it to a double speed signal;
Generating means for interpolating pixels of the double speed signal to generate the HD signal;
Output means for outputting a vertical synchronizing signal of the HD signal based on a vertical synchronizing signal of the double speed signal;
The output means includes
When it is determined that the SD signal conforms to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronization signal of the double speed signal. Thereafter, the vertical sync signal of the HD signal is output at predetermined time intervals,
When it is determined that the SD signal does not conform to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal delayed by a predetermined delay amount for each vertical synchronization signal of the double speed signal An image signal conversion device for outputting a signal. When the phase difference between the vertical synchronization signal of the double-speed signal and the vertical synchronization signal of the HD signal is greater than a threshold, the output means converts the phase of the vertical synchronization signal of the HD signal by one line per field. Correct one by one
Image signal conversion apparatus according to 請 Motomeko 1. The determination means determines whether the SD signal conforms to the predetermined television broadcast signal 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. Do
Image signal conversion apparatus according to 請 Motomeko 1. The predetermined television broadcast signal standard is the NTSC standard.
Image signal conversion apparatus according to 請 Motomeko 1. In an image signal conversion method of an image signal conversion apparatus for converting an SD signal into an HD signal,
A determination step of determining whether the SD signal is compliant with a predetermined television broadcast signal standard ;
A conversion step of multiplying the number of scanning lines of the SD signal by a constant and converting it to a double speed signal;
Generating the HD signal by interpolating pixels of the double speed signal;
Outputting a vertical synchronizing signal of the HD signal based on a vertical synchronizing signal of the double speed signal;
The output step includes
When it is determined that the SD signal conforms to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronization signal of the double speed signal. Thereafter, the vertical sync signal of the HD signal is output at predetermined time intervals,
When it is determined that the SD signal does not conform to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal delayed by a predetermined delay amount for each vertical synchronization signal of the double speed signal An image signal conversion method for outputting . A program for controlling an image signal converter for converting an SD signal into an HD signal,
A determination step of determining whether the SD signal is compliant with a predetermined television broadcast signal standard ;
A conversion step of multiplying the number of scanning lines of the SD signal by a constant and converting it to a double speed signal;
Generating the HD signal by interpolating pixels of the double speed signal;
Outputting a vertical synchronizing signal of the HD signal based on a vertical synchronizing signal of the double speed signal;
The output step includes
When it is determined that the SD signal conforms to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronization signal of the double speed signal. Thereafter, the vertical sync signal of the HD signal is output at predetermined time intervals,
When it is determined that the SD signal does not conform to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal delayed by a predetermined delay amount for each vertical synchronization signal of the double speed signal Output
A recording medium on which a program for causing a computer of an image conversion apparatus to execute processing is recorded. In a television receiver that converts an SD signal into an HD signal for display,
Determining means for determining whether or not the SD signal conforms to a predetermined television broadcast signal standard ;
Conversion means for multiplying the number of scanning lines of the SD signal by a constant and converting it to a double speed signal;
Generating means for interpolating pixels of the double speed signal to generate the HD signal;
Output means for outputting a vertical synchronizing signal of the HD signal based on a vertical synchronizing signal of the double speed signal;
The output means includes
When it is determined that the SD signal conforms to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal is output after being delayed by a predetermined delay amount from the vertical synchronization signal of the double speed signal. Thereafter, the vertical sync signal of the HD signal is output at predetermined time intervals,
When it is determined that the SD signal does not conform to the predetermined television broadcast signal standard, the vertical synchronization signal of the HD signal delayed by a predetermined delay amount for each vertical synchronization signal of the double speed signal TV receiver that outputs . When the phase difference between the vertical synchronization signal of the double-speed signal and the vertical synchronization signal of the HD signal is greater than a threshold, the output means converts the phase of the vertical synchronization signal of the HD signal by one line per field. Correct one by one
Television receiver according to 請 Motomeko 7. The determination means determines whether the SD signal conforms to the predetermined television broadcast signal 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. Do
Television receiver according to 請 Motomeko 7. The predetermined television broadcast signal standard is the NTSC standard.
Television receiver according to 請 Motomeko 7.

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