JP2008099091A - Image processing method and television receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a deteriorated image by performing scan line conversion in accordance with an input image. <P>SOLUTION: There are included a first scan line converter for converting an input video signal from a first scan line system to a second scan line system; a signal processing unit to which the video signal converted into the second scan line system by the first scan line converter is supplied and which performs signal processing on a luminance signal and a chrominance signal; a second scan line converter which converts the video signal supplied from the signal processing unit into a video signal of the first scan line system; and a control means which identifies a format of the input video signal and a format of the input video signal upon photographing, and controls operations of the first and second scan line converters and the signal processing unit when the format upon photographing is the second format and the format of the input video signal is the first format, thereby enhancing image quality of a deteriorated progressive signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image processing method for a television signal and a television receiver that perform high image quality processing using I / P (Interlace / Progressive) conversion.

In recent years, digital terrestrial broadcasting has become full-fledged, and television receivers and hard disk recorders equipped with tuners for terrestrial digital broadcasting as well as tuners for receiving analog broadcasting can be obtained relatively inexpensively. Therefore, the penetration rate to the home is also rising.
In the analog broadcasting, a television program shot in an SD (Standard Definition) format such as an interlace method with a horizontal × vertical resolution of 480 × 720 is transmitted from a broadcasting station. In this case, the television receiver is equipped with an image processing circuit that performs various high image processing such as double-speed conversion and noise reduction, such as a digital reality creation circuit that changes the SD format signal to an image quality close to that of the HD format signal. It has been.
What is transmitted as terrestrial digital broadcasting is a TV program shot in the HD (High Definition) format in the progressive format with 1920 × 1080 interlace format or horizontal × vertical resolution of 720 × 480. Since the image quality is higher than that of the format, these image processing circuits are controlled to be displayed by bypassing. However, in terrestrial digital broadcasting, there are still a few TV programs shot in SD format converted to progressive format (hereinafter referred to as conversion formats), and the images are not very high quality. In the case of a television program, the advantage of digital terrestrial broadcasting is that noise such as ghost is removed. Therefore, for analog broadcasting, while image improvement processing is performed, when the video is captured in the SD format, scanned line converted, and input to the tuner as a progressive video signal, the progressive video signal is Since it is regarded as high image quality, image improvement processing is not performed. For this reason, a reversal phenomenon in which the image quality is inferior when a device compatible with digital terrestrial broadcasting is used as compared with a receiver based only on analog broadcasting may occur.

Patent Document 1 discloses a P / I converter that thins out a scanning line of a progressive video signal and converts it into an interlace video signal and vice versa.
In particular, the video signal processing apparatus of Patent Document 1 includes an I / P conversion unit, a synthesis unit, and a P / I (progressive / interlace) conversion unit (not shown).
The I / P converter converts the input interlaced video signal into a progressive video signal and outputs it. The synthesizer synthesizes the progressive video signal output from the I / P converter and the video signal for sub-picture or OSD (on-screen display) display. The P / I converter converts the progressive video signal into an interlace video signal and outputs the interlace video signal. This video signal processing apparatus is configured to output both progressive and interlace video signals.

Patent Document 2 discloses an ATV (Advanced Television) system, an NTSC (National Television System Committee) system, a letterbox type EDTV (Extended Definition Television) system, an HDTV (High Definition Television system), etc. In addition, I / P conversion, P / I conversion and the like associated with the system conversion are disclosed.
However, these Patent Documents 1 and 2 do not have a function of mode discrimination for a conventional analog broadcast signal and a progressive video signal obtained by converting the analog signal into another system, for example.
Also, if the video signal at the time of shooting is an SD signal, and this SD signal is scanned line converted and input as a progressive video signal, image processing for image improvement is not performed again because it is regarded as high image quality. In particular, there is a problem that an image reproduced by a television receiver compatible with digital broadcasting that does not include an I / P converter is deteriorated from an image of terrestrial analog broadcasting.
JP 2003-348446 A JP-A-7-162810

  The present invention has been made in view of the above problems, and an object of the present invention is to convert a P / I conversion of an input signal when a TV program shot by an interlace method is input as a progressive video signal obtained by scanning line conversion. If the external I / P conversion is superior to the I / P converter built in the television receiver, the image quality is improved by performing I / P conversion after image processing. It is to allow the user to select so that the switching means can switch to external I / P conversion.

  The television receiver of the present invention is a television receiver having a scanning line converter, a first scanning line converter that converts an input video signal from a first scanning line system to a second scanning line system, A video signal supplied from the first scanning line converter to the second scanning line system and processing a luminance signal and a color signal, and a video supplied from the signal processing unit A second scanning line converter for converting a signal into the video signal of the first scanning line system, a format of the input video signal and a format at the time of shooting the input video signal, and a format at the time of shooting. Includes the first and second scanning line converters and a control means for controlling the operation of the signal processing unit when the input video signal is in the first format.

  The image processing method of the present invention includes a step of selecting one of a plurality of format conversion processing methods, and a step of identifying a format of an input video signal during an automatic conversion operation as a result of selecting the format conversion processing; As a result of identifying the format, when the format is the first format, referring to the electronic information guide, identifying the format of the video signal at the time of shooting corresponding to the input video signal, and the video at the time of shooting As a result of identifying the format of the signal, when the format is the second format, the step of controlling the conversion from the first format to the second format is performed, and the format is converted to the second format. High image processing including conversion processing for converting the video signal into the first format is performed. And a step of controlling so.

  The present invention realizes the use of P / I conversion and I / P conversion provided in a television receiver for an HD signal obtained by up-converting an SD signal photographed by an interlace method to a progressive method, The user can select the most suitable scan line format for the user and can always watch with the best image quality.

Embodiments of processing according to the present invention will be described below with reference to the drawings, taking as an example the case of a television receiver for digital television broadcast waves using terrestrial waves.
FIG. 1 shows a block configuration of a television receiver according to a first embodiment of the present invention.

  The television receiver 100 includes a digital tuner 12, an AV-SW (Audio / Video Switch) 13, a P / I (progressive / interlace) converter 14, chroma decoders 15 and 15a, and a video signal processing circuit. (Double speed, IP conversion) 16, multi-screen generation circuit 17, panel driver 18, audio signal processing circuit (audio processor) 19, (audio signal) amplifier 20, nonvolatile memory 21, TV microcomputer 22, front key 23 , An infrared light receiver 24, an IIC (Inter IC) bus 25, and the like.

The U / V antenna 10 receives terrestrial VHF and UHF frequency channels. In the case of terrestrial digital broadcasting, a specific channel of the UFH frequency is set, and a high-frequency signal corresponding to each channel is received via the U / V antenna 10.
The external device 11 with a digital tuner includes, for example, a hard disk recorder with a tuner, and records and reproduces a signal received via the tuner on a desk.
As an example of a digital terrestrial television tuner, the digital tuner 12 includes a tuner module, a descrambling unit, and a transport decoder (DeMUX; De-multiplexer) that are not shown. And a decoding processing unit (AV decoding, data processing) and the like.

A tuner module (not shown) is also called front-end signal processing, selects a channel of a desired frequency, demodulates a modulated wave, performs error correction processing, frame reorganization, and energy despreading processing.
A descrambling (key) unit (not shown) performs a process called descrambling for releasing a scrambled signal for receiving a signal transmitted by scrambled a pay broadcast or the like.
The transport decoder performs processing for extracting a predetermined stream from a TS in which a plurality of streams such as a video signal, an audio signal, and a data signal are multiplexed on the transmission side.
A decoding processing unit (AV decoding, data processing) (not shown) decodes the video signal, the audio signal, and the data signal extracted by the transport decoder. These signals are decoded (decoded) in accordance with the MPEG standard from signals encoded according to the MPEG (Motion Picture Expert Group) standard.

  An AVSW (audio / video switching switch) 13 switches a plurality of video and audio input from the digital tuner 12 or the external video input terminal 11 according to the user's selection, and outputs the selected video and audio. The

  The P / I converter 14 includes a field discriminating circuit, a scanning line thinning circuit, and the like, and is output from the AV-SW 13, and the scanning line converts a progressive format video signal into an interlace format video signal (down-converted). )

  The chroma decoders 15 and 15a are composed of black level correction, Y / C separation (brightness signal and color signal separation) circuits, etc., and separate the composite video signal supplied from the P / I converter 14 into a luminance signal and a color signal. To do.

The video signal processing circuit (double speed, IP conversion) 16 includes a gamma correction circuit, a white balance circuit, a matrix circuit, a motion detection circuit, a line memory, a field memory, a double speed conversion circuit, and the like. After the color signal is adjusted for white balance, a color difference signal is generated.
A video signal processing circuit (double speed, IP conversion) 16 converts an interlace video signal into a progressive video signal (up-conversion). At this time, the speed of the scanning line is converted to twice the speed of the scanning line of the input video signal.

  The multi-screen generation circuit 17 is composed of a synchronization signal circuit, a frame memory, a memory control circuit, a video processing circuit, etc., and displays a multi-channel video signal on the same screen and superimposes character information such as a menu on the video signal. Image processing for display is performed, and a panel driver (video processor) 18 generates R, G, B signals for driving a CRT (Cathode Ray Tube), a liquid crystal display panel, a plasma display panel, and the like. Further, the control is performed by the control signal transferred from the TV microcomputer 22 via the IIC bus 25, and the control of the picture and the brightness and the correction of the image distortion are performed.

  The panel driver 18 is composed of a circuit for driving a liquid crystal display panel, a CRT, etc., for example, and generates a drive signal for simultaneously displaying a divided screen and character information in accordance with a signal output from the multi-screen generation circuit 17. To do.

  The audio processor 19 and the amplifier 20 (for audio signal) perform signal processing of the input audio signal, and adjust and output the volume, balance, and sound quality. Thereafter, the audio signal is amplified by the amplifier 20 and output to the speaker.

  The nonvolatile memory 21 stores application programs, system programs, and the like, and uses these programs to control the operation of each block with commands output from the TV microcomputer 22.

  The TV microcomputer 22 is connected via the IIC bus 25 to the digital tuner 12, AV-SW 13, chroma decoders 15 and 15a, video signal processing circuit (double speed, IP conversion) 16, multi-screen generation circuit 17, panel driver 18, and audio processor. 19 is connected to the amplifier 20. In response to a command input from the front key 23, the TV microcomputer 22 determines a signal path in the operation television receiver 100 according to a program stored in the nonvolatile memory 21, and performs image processing, audio signal Processing and other functions are performed.

  The infrared light receiving unit 24 is provided with an infrared light receiving element in the light receiving element, receives an infrared light control signal transmitted from, for example, a remote controller (remote controller), and outputs the control signal to the TV microcomputer. As a result, the digital tuner 12, AV-SW 14, chroma decoders 15 and 15a, multi-screen generation circuit 17, panel driver 18, audio processor 19 and amplifier 20 are controlled to select a channel, switch AV-SW, and select a format. Video signal processing, audio signal processing, etc. are performed.

Next, the operation of the terrestrial digital broadcast TV (television) receiver 100 shown in FIG. 1 will be described.
An RF (Radio Frequency) signal received by the U / V antenna 10 is received by the digital tuner 12 and demodulated video signal (composite video signal is input to the AV-SW 13. Output from the external device 11 with digital tuner. The composite video signal is input to the AV-SW 13 from the external video input terminal.
The AV-SW 13 is controlled by a command transferred from the TV microcomputer 22 via the IIC bus 25, selects an input video signal to be displayed on the display device, and outputs a composite video signal. The audio signal to be output to the audio processor 19 is selected and output.
When the composite video signal supplied from the AV-SW 13 is a progressive composite video signal, the P / I converter 14 converts the composite video signal into an interlace video signal and outputs the video signal to the chroma decoder 15.
The chroma decoder 15 separates the luminance signal and the color signal, and the video signal processing circuit 16 performs signal processing on the luminance signal and the color signal. After the signal processing for improving the image quality is performed, the multi-screen generation circuit 17 is processed. Is output. The multi-screen generation circuit 17 selects the video signal output from the video signal processing circuit 16 or the chroma decoder 15a and displays the multi-screen on each independent area, or displays the child screen superimposed on the parent screen. Image processing is performed, and R, G, B signals for driving a CRT or a liquid crystal panel display are generated by a panel driver (video processor) 18.
The multi-screen generation circuit 17 is controlled by a control signal transferred from the TV microcomputer 22 via the IIC bus 25, and controls a picture, brightness, etc., and corrects image distortion.
The audio processor 19 is controlled by a control signal transferred from the TV microcomputer 22 via the IIC bus 25, and adjusts and outputs the volume, balance, and sound quality of the audio signal. Thereafter, the audio signal is amplified by the amplifier 20 and output to the speaker.

In the television receiver 100 shown in FIG. 1, a video signal processing circuit (double speed, IP conversion) 16 is provided at a subsequent stage of a chroma decoder 15 that is a signal path of a main screen, and a chroma decoder 15a that is a signal path of a sub screen. It is not provided in the latter stage.
However, as a modification of the present invention, a second video signal processing circuit (double speed, IP conversion) 16a may be newly provided between the chroma decoder 15a and the multi-screen generation circuit 17.
As a result, in multi-screen display, image signals that have been double-speed and I / P converted are displayed on a plurality of displayed screens, and high-quality images can be obtained in all cases.

  In the signal processing described above, control information such as channel selection from the user is input to the TV microcomputer 22 by the remote controller and the front key 23, and various controls are executed via the IIC bus 25 and the like. The nonvolatile memory 21 stores information necessary for the TV microcomputer 22 to perform various controls.

  The above is a standard signal path. In the present invention, a high-quality image of a video signal captured in the SD format and converted into a progressive format (up-converted) of the scanning line is realized. . The P / I converter 13 described here may be a circuit that only generates an interlaced video signal of an odd field and an odd field by simply decimating an input progressive composite video signal. Can be built at low cost.

Next, the operation of the TV microcomputer 22 that controls the overall operation of the television receiver 100 will be described with reference to the flowchart shown in FIG.
FIG. 2 is a flowchart relating to a control operation based on user settings.

The user can select a menu screen by operating the remote controller, and one item of the menu screen is HD recreation related to scanning line conversion processing. When this HD recreation is selected in step ST-1, as shown in FIG. 3, an HD recreation selection menu related to the scanning line conversion processing mode is displayed on the display screen of a TV monitor or the like. The processing mode is selected by selecting the AUTO (automatic) or OFF button displayed on the display screen.
When the AUTO button is selected, the process proceeds to step ST-2.
When the menu OFF button on the display screen is selected by the user, P / I conversion (down-conversion) is not performed even for a conversion format shot in the SD format and converted to the progressive format (step conversion). ST-6). This assumes a case where upconversion on the external device or the broadcasting station side is preferred.

  In step ST-2, the scanning line system (mode) of the input video signal is determined. As a result of determining the mode, when the input video signal is not in the HD format, the process proceeds to step ST-6 and P / I conversion is not performed. On the other hand, in the HD format, the process proceeds to step ST-3.

In step ST-3, information relating to the format of the video signal at the time of shooting is acquired from an EPG (Electronic Program Guide).
Whether the TV program is actually an SD format at the time of shooting and converted to a progressive format or an HD format from the time of shooting can be obtained from an EPG (Electronic Program Guide). When the user setting is automatic (AUTO), the television receiver (100) side automatically determines whether to use the P / I converter.

In step ST-4, when it is not a video signal photographed in the SD format from the acquired EPG information, the process proceeds to step ST-6 to control not to perform P / I conversion. In the case of a video signal shot in the SD format from the acquired EPG information, the process proceeds to step ST-5.
Note that it is possible that the determination of whether the video signal captured by EPG acquisition is in SD format or HD format may malfunction, so an ON button is provided in the menu related to HD recreation on the display screen shown in FIG. By selecting this, P / I conversion may be set manually.
In step ST-5, the control operation is performed as follows.

  When the input video signal is taken in the SD format, it is input to the AV-SW 13 and the signal is output from the P / I converter 14, chroma decoder 15, and video signal processing circuit (double speed, IP conversion) 16. It is controlled to be processed, and further input to the multi-screen generation circuit 17 to perform image processing for screen display, and then output to the panel driver 18.

The operation conditions of the television receiver 100 shown in FIG. 4 to FIG. 6 are automatic (AUTO) image signal processing for various formats of input video signals using the HD recreation menu displayed on the display screen shown in FIG. Corresponds to when selected.
FIG. 4 shows a signal processing path in the television receiver (100) for digital terrestrial broadcasting when a video signal photographed in the HD format is received.
The setting of these signal processing paths is controlled by transferring a control signal from the TV microcomputer 22 to each block via the IIC bus 25 based on the result of determining the format of the input signal according to the flowchart shown in FIG. .
This signal processing corresponds to a condition in which the input video signal is in the HD format in step ST-2 of the flowchart of FIG. 2 and the video signal at the time of shooting is not in the SD format in step ST-4 ( Step ST-6). As described above, at this time, the P / I converter 14 is not passed and the P / I conversion process is not performed.
That is, FIG. 4 shows a signal path when the input video signal is in the HD format.
The input video signal may be a video signal demodulated from the digital tuner 12 or an HD format video signal output from the external device 11 with a digital tuner.

The input video signal (HD source) is a signal originally shot in the HD format, and is input to the AV-SW 13 and then supplied to the chroma decoder 15 without passing through the P / I converter 14. A chroma decoder 15 separates the composite video signal into a luminance signal and a color signal. The signal is processed by the chroma decoder 15 and then input to the multi-screen generation circuit 17.
In this case, since the video signal at the time of shooting is in the HD format, it is not necessary to perform signal processing again by the video signal processing circuit (double speed, IP conversion) 16, and after passing through the video signal processing circuit (double speed, IP conversion) 16. , And input to the multi-screen generation circuit 17.
The multi-screen generation circuit 17 performs signal processing for video signal superimposition display and multi-screen display, and the panel driver (video processor) 18 performs CRT (Cathode Ray Tube) and R, G, B signals for driving the panel. Is generated. Further, control of a picture, brightness, etc., and correction of image distortion are performed by a control signal transferred from the TV microcomputer 22 via the IIC bus 25. The video signal processed by the multi-screen generation circuit 17 is supplied to the panel driver 18 to display a plurality of divided screens on the display screen or to display an image in which character images are superimposed.
In parallel with this, the audio signal output from the AV-SW 14 is input to the audio processor 19 and the (audio signal) amplifier 20, and the volume, balance, and sound quality are adjusted and output.

As described above, when the video signal photographed in the HD format is received by the television receiver 100 shown in FIG. 1, it is not necessary to perform image signal processing for improving the image quality again.
Note that not passing through the P / I converter 14 is that the input to the P / I converter 14 is switched by using an electronic switch or the like and the output from the P / I converter 14 is switched. This means that the video signal originally input to the P / I converter 14 is directly input to the chroma decoder 15 at the next stage. Through the video signal processing circuit 16 also means the same signal processing.

Next, FIG. 5 illustrates an operation when another input video signal format is input to the television receiver 100.
The input video signal in FIG. 5 is a video signal shot in the SD format, and is an interlace video signal. The operation will be described according to the signal (processing) path of the video signal at that time. The operation at this time corresponds to steps ST-2 and ST-6 in the flowchart of FIG.
The video signal is input to the AV-SW 13, where it is switched to a predetermined video signal and audio signal, the video signal is output to the chroma decoder 15, and the audio signal is output to the audio signal processing circuit (audio processor) 19. .
Since the video signal shot in the SD format is already interlaced, it is not necessary to perform P / I conversion (down-conversion), so the video signal from the AV-SW 13 passes through the P / I converter 14. Without being input to the chroma decoder 15.
The chroma decoder 15 separates the composite video signal supplied from the AV-SW 13 into a luminance signal and a color signal. After signal processing by the chroma decoder 15, the video signal processing circuit (double speed, IP conversion) 16 performs gamma correction processing on the luminance signal, and white color adjustment and color difference signal conversion processing on the color signal. The signal-processed luminance and color signals are subjected to I / P conversion processing or double speed conversion (up-conversion), and are output to the multi-screen generation circuit 17 with improved image quality. The multi-screen generation circuit 17 performs image processing for displaying or superimposing the selected video signal, and the panel driver 18 generates R, G, and B signals for driving the CRT and the panel.
It is controlled by the TV microcomputer 22 through the IIC bus 25 and controls the picture, brightness, etc., and corrects image distortion. The signal processed by the multi-screen generation circuit 17 is supplied to the panel driver 18 to display an image of the selected channel and a plurality of divided screens on the display screen, or display a character image at the same time.
In parallel with these operations, the audio signal output from the AV-SW 13 is input to the audio processor 19 and the amplifier 20, and is output after adjusting the volume, balance, and sound quality.

The connection configuration and operation of each block of the television receiver 100 when the program shot in the SD format is received is controlled by the TV microcomputer 22.
When AUTO is selected in the HD recreation menu of the input video signal, the format is determined, and each function block is controlled by the control signal output from the TV microcomputer 22 based on the determination result as the SD format. A processing path is determined.

  As described above, when the signal input to the television receiver 100 is a video signal shot in the SD format, it is originally an interlace method, and therefore it is not necessary to perform P / I conversion by the P / I converter 13 and chroma. Input to the decoder 15. However, unlike the HD format of FIG. 4, the video signal itself at the time of shooting is inferior in image quality as compared with the HD source. Let

  FIG. 6 shows a signal processing path of the television receiver 100 when an HD signal shot in the SD format and then converted into the progressive format is input. The input video signal shown in FIG. 6 and the input video signal shown in FIG. 5 are the same in the SD format, but are different in that they are HD signals converted into the progressive format.

When the HD signal converted into the progressive system is input in this way, a control signal is supplied to each circuit block by the TV microcomputer 22 via the IIC bus 25. As a result, the output of the external device 11 with a digital tuner or the digital tuner 12 is connected to the AV-SW 13.
The output of the AV-SW 13 is supplied to the P / I converter 14, and the output of the P / I converter 14 is supplied to the chroma decoder 15 and the audio processor 19. The output of the chroma decoder 15 is supplied to a video signal processing circuit (double speed, I / P conversion) 16, and the output of the video signal processing circuit (double speed, I / P conversion) 16 is supplied to a multi-screen generation circuit 17. The output of the screen generation circuit 17 is supplied to the panel driver 18.
Further, the output of the audio processor 19 is supplied to the amplifier 20 to output an audio signal.

A command is transmitted from the front key 23 or the infrared light receiving unit 24 to the TV microcomputer 22 to generate a control signal. This control signal is transferred to each functional block via the IIC bus 25. For example, the digital tuner 12 selects a specific channel from the received TV channel, the converted HD signal is demodulated, and the P / I converter. 14.
Alternatively, in the external device 11 with a digital tuner, the HD signal converted into the progressive format by the recorded, reproduced or demodulated SD source is demodulated and then output to the P / I converter 14.
Control information other than TV channel tuning from the user is also input to the TV microcomputer 22 by the front key 23 and the remote controller, and various controls are executed via the IIC bus 25 and the like.

When the converted HD signal is input to the P / I converter 14, an odd field video signal is output from the odd line scanning line, and an even field video signal is output from the even line scanning line. Convert the signal to an interlaced signal. At this time, the output of the P / I converter 14 is output at a speed half that of the input progressive signal.
In other words, although it is an HD signal, it is a video signal obtained by simply converting the SD format into a progressive format. Therefore, if the supplied signal passes through each high-quality signal processing circuit (device) as it is, the image quality may be poor. Therefore, the P / I converter 14 once converts the signal into an interlace video signal (down-conversion).

The video signal down-converted to the interlace method is output to the chroma decoder 15, and the chroma decoder 15 performs Y / C separation of the composite video signal into a luminance signal and a color signal as described above.
After the signal processing by the chroma decoder 15, the video signal down-converted to the interlace method is input to the video signal processing circuit (double speed, IP conversion) 16, the luminance signal is subjected to gamma correction processing, and the color signal is white. The balance is adjusted and a color difference signal is generated.
After the image processing of the luminance signal and the color signal is performed, the I / P conversion processing is performed. In the case of an odd field, the odd line outputs the line at twice the speed, and the even line interpolates using the odd lines before and after the even line and outputs at the double speed. In the case of an even field, even lines are output at twice the speed, and odd lines are interpolated using lines before and after this line and output at twice the speed.
The method of I / P conversion is not limited to the above-described P / I conversion method, and may be converted by previous field scanning line interpolation, front / rear scanning line interpolation, average line scanning line interpolation, or the like.
The progressive format video signal that has been subjected to I / P conversion processing (or double speed conversion) and improved in image quality is supplied to the multi-screen generation circuit 17.
In the multi-screen generation circuit 17, for example, signal processing for dividing and displaying video signals of a plurality of TV channels and superimposing character information on the video signal is performed, and R, G, and B signals are generated and output to the panel driver 18. The

  At this time, the control signal output from the TV microcomputer 22 is transferred to the audio processor 19 and the amplifier 20 via the IIC bus 25 to control these operations, and the video image and character information on the display screen desired by the user. The audio signal processing corresponding to the above is performed and output to a speaker or the like via the amplifier 20.

  As described above, when an HD signal is captured in the HD format, there is no need to perform image signal processing such as P / I conversion processing or I / P conversion processing, and when an SD signal is captured in the SD format. Without P / I conversion processing, I / P conversion processing improves the image quality, and when the video signal is in a conversion format converted to the progressive format after being shot in SD format, P / I conversion processing, video By performing signal processing and I / P conversion processing, high-quality video can be generated according to the scanning line format of each video signal.

FIG. 7 shows the configuration of a television receiver 200 for terrestrial digital broadcasting for multi-screen display, which is a second embodiment of the present invention. Here, in the television receiver 200 shown in FIG. 7, the same blocks as those in FIG. 1 are assigned the same numbers.
The television receiver 200 has substantially the same configuration as that shown in FIG. 1, but omits the P / I converter provided in the previous stage of the AV-SW 13 and instead uses the P / I in the subsequent stage of the chroma decoders 15 and 15a. Video signal processing circuits (P / I, I / P) 16 and 16a having functions for conversion, image processing, and I / P conversion processing are provided.
Further, a video signal processing circuit (P / I, I / P) 16a having functions of P / I conversion, image processing, and I / P conversion processing may be provided at the output of the chroma decoder 15a.

Next, the operation of the television receiver 200 will be described. In order to simplify the explanation, the video signal output from each of the external device 11 with digital tuner and the digital tuner 12 is the same SD signal or HD signal, and the format of the video signal at the time of shooting is the same SD source or HD source. The operation when
The signal path of the multi-screen television receiver 200 shown in FIG. 7 is such that the input video signal is, for example, an SD signal (interlace) or HD signal (progressive), and the video signal format at the time of shooting is SD source ( Or interlaced) or HD source (or progressive).
When the video signals of the first and second TV channels are the HD source and HD signal, the video signal processing circuit (I / P) is controlled by the TV microcomputer 22 so as to have the same signal path as in FIG. , P / I conversion) 16 and 16a, the video signal output from the chroma decoder 15 (or 15a at the same time) is input to the multi-screen generation circuit 17, and performs the same operation as that of FIG. It is output to 218.
When the video signals of the first and second TV channels are SD sources and SD input signals, the signal path is controlled by the TV microcomputer 22 so as to be the same path in FIG. 5, and is output from the chroma decoders 15 and 15a. The video signals corresponding to the first and second channels are supplied to the video signal processing circuits (I / P, P / I conversion) 16 and 16a, subjected to image processing and I / P conversion processing, and then a multi-screen generation circuit. 17 is output.
The multi-screen generation circuit 17 performs image processing so as to configure video signals of a plurality of channels on the same screen and outputs the processed signals to the panel driver 18.
Next, when the video signals of the first and second TV channels are SD sources and are HD input signals, the first and second TV channels are controlled by the TV microcomputer 22 so as to have the same signal path as shown in FIG. The video signals output from the second channel are input to the chroma decoders 15 and 15a and separated into luminance signals and color signals, and then the video signal processing circuits (I / P and P / I conversion) corresponding to the respective channels. ) 16, 16 a, I / P conversion processing, image processing, P / I conversion processing for each channel, and output to the multi-screen generation circuit 17.
The multi-screen generation circuit 17 performs image processing so that the video signals of a plurality of channels are divided and displayed on the same screen, and outputs them to the panel driver 18.

As described above, the television receiver 200 for multi-screen display can also display each image of the multi-screen with high quality, like the television receiver 100 of FIG.
As a modification, the video signal processing circuit (P / I, I / P conversion) 16a of the television receiver 200 of FIG. 7 is omitted, and the output of the chroma decoder 15a is directly connected to the multi-screen generation circuit 217. You may do it.
The SD source and HD signal are input to the chroma decoder 15 and image processing for high-quality display is performed. When the HD source and the HD signal are input to the chroma decoder 15, the signal is processed by the chroma decoder 15 and output to the multi-screen generation circuit 17. On the other hand, when an SD source and an SD signal are input and there is no need to display a high-quality video, the SD signal may be input to the chroma decoder 15a to perform normal image quality processing and display the video.

As described above, in the present invention, when the user selects automatic (AUTO) HD recreation, the signal captured in the SD format and up-converted to the progressive format is converted into an interlace signal by P / I conversion. By doing so, it is possible to perform high image quality processing including I / P conversion provided in the television receiver, so that the image quality can be improved, and originally the HD format signal of the HD source has high image quality. Therefore, since control is performed so that high image quality processing including I / P conversion is not performed, the user can always view with the best image quality.
That is, regardless of the format of the input video signal, high-quality video can be generated regardless of whether the video signal at the time of shooting is the SD format or the HD format.

It is a figure which shows the block configuration of the television receiver of this invention. It is a flowchart for demonstrating operation | movement of a television receiver. It is a figure which shows the format selection menu screen displayed on TV monitor. It is a figure which shows the signal path | route for demonstrating operation | movement of the television receiver shown in FIG. It is a figure which shows the signal path | route for demonstrating operation | movement of the television receiver shown in FIG. It is a figure which shows the signal path | route for demonstrating operation | movement of the television receiver shown in FIG. It is a figure which shows the block configuration of the other television receiver of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... U / V antenna, 11 ... External device with digital tuner, 12 ... Digital tuner, 13 ... AV-SW (audio / video changeover switch), 14 ... P / I (progressive interlace) converter, 15, 15a ... Chroma decoder, 16, 16a ... Video signal processing circuit (double speed, IP conversion), 17 ... Multi-screen generation circuit, 18 ... Panel driver, 19 ... Audio processor (audio signal processing circuit), 20 ... Amplifier, 21 ... Non-volatile memory 22 ... TV (television) microcomputer, 23 ... front key, 24 ... infrared light receiver, 100,200 ... television receiver.

Claims (12)

In a television receiver having a scanning line converter,
A first scanning line converter for converting an input video signal from a first scanning line system to a second scanning line system;
A signal processing unit that receives the video signal converted into the second scanning line method by the first scanning line converter and performs signal processing of a luminance signal and a color signal;
A second scanning line converter for converting the video signal supplied from the signal processing unit into the video signal of the first scanning line method;
Identifying the format of the input video signal and the format at the time of shooting the input video signal, and when the format at the time of shooting is the second format and the input video signal is the first format, A television receiver comprising: a second scanning line converter; and control means for controlling the operation of the signal processing unit. The television receiver includes an image quality enhancement processing unit that includes the first scanning line converter and performs an image quality enhancement process on a video signal, a display driving unit and a control unit for driving the display device. And
The first scanning line converter converts the input video signal to a progressive method when the input video signal is an interlace method,
The image quality improvement processing unit performs image quality improvement processing on the progressive video signal output from the first scanning line converter,
The second scanning line converter converts a progressive input video signal into an interlace video signal,
The control means identifies the format of the input video signal and the format at the time of shooting, and when the input video signal is in the HD format and the format at the time of shooting is also the HD format, the processing by the second scanning line converter And when the input video signal is in HD format and the format at the time of shooting is SD format, control is performed so that the processing by the second scanning line converter and the image quality improvement processing means is performed. The television receiver according to claim 1, wherein when the input video signal is in an SD format, control is performed so as to bypass the processing by the second scanning line conversion. The television receiver further includes a signal switching circuit that selects and outputs a predetermined input video signal and input audio signal according to an operation with respect to a plurality of input video signals and a plurality of input audio signals. Television receiver. The television receiver according to claim 1, further comprising a tuner that receives and demodulates a broadcast signal and decodes the demodulated signal into a video signal, an audio signal, and a data signal.   4. The television receiver according to claim 3, wherein the control means identifies the format at the time of photographing using an electronic information guide based on the data signal decoded by the tuner. A multi-screen generating circuit that performs image processing for displaying a menu superimposed on the video signal;
When an item related to scanning line conversion processing is selected from the menu displayed on the display screen based on the output signal from the multi-screen generation circuit, the control means uses the electronic information guide to control the image quality improvement processing means. The television receiver according to claim 4, wherein the operation of the second scanning line converter is controlled. The television receiver has a terminal for inputting a demodulated signal from an external device, and the multi-screen generation circuit performs image processing for displaying the video signal and the demodulated signal on the same screen. The described television receiver. Selecting one of a plurality of processing methods for format conversion;
As a result of selecting the format conversion process, a step of identifying the format of the input video signal during the automatic conversion operation;
As a result of identifying the format, when the format is the first format, referring to the electronic information guide, identifying the format of the video signal at the time of shooting corresponding to the input video signal;
Controlling the conversion from the first format to the second format when the format is the second format as a result of identifying the format of the video signal at the time of shooting;
An image processing method comprising: controlling to perform high image processing including conversion processing for converting the video signal converted into the second format into the first format. Including a first scanning line conversion process for converting to a progressive system video signal when the input video signal is an interlace system, and an image quality improvement process for the progressive system video signal converted by the first scanning line conversion process An image processing method in a display device having image quality improvement processing means for bypassing when an input video signal is a progressive method,
Selecting one of a plurality of processing methods for format conversion;
A step of identifying the format of the input video signal when the selection to automatically perform the scanning line conversion process is made;
As a result of identifying the format, when the format is the first format, referring to the electronic information guide, identifying the format of the video signal at the time of shooting corresponding to the input video signal;
Controlling the conversion from the first format to the second format when the format is the second format as a result of identifying the format of the video signal at the time of shooting;
An image processing method comprising: controlling to perform high image processing including conversion processing for converting the video signal converted into the second format into the first format. The image processing method according to claim 9, wherein selection of a plurality of processing methods related to the scanning line conversion processing is performed by selecting a menu on a display screen. The image processing method according to claim 9, wherein an electronic information guide is used to identify the format. The image processing method according to claim 9, further comprising a step of stopping conversion of the input video signal from a progressive system to an interlace system when an automatic conversion operation is not selected by the selection.

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