JP2008054083A - Video signal processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video signal processing device, provided with a configuration for preventing video deterioration due to the enlargement/reduction processing being performed a plurality of number times until the time that video is displayed. <P>SOLUTION: The video signal processing apparatus, having a format conversion function for performing enlargement or reduction processing in a scaler part so as to make the format of inputted video signal be a preset video format, is provided with a format conversion mode in which optional video formation is selected, and an inputted video signal is outputted in a video format converted, by properly performing enlargement or reduction processing of the input video signal in the scaler part; and a through mode in which the inputted video signal is outputted, as is, without having to perform format conversion of the inputted video signal, and can be used by switching between the two modes. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video signal processing apparatus capable of handling video signals of a plurality of formats, and relates to a technique for minimizing image quality degradation caused by format conversion.

  In the current television broadcasting, video signals of various formats such as BS and CS digital broadcasting and terrestrial digital broadcasting are used in addition to the conventional analog broadcasting. These video signals have different numbers of scanning lines, horizontal frequencies, and the like. For example, an interlace signal having 480 effective scanning lines (hereinafter referred to as 480i) and an interlace signal having 1080 effective scanning lines (hereinafter referred to as 1080i). ), A progressive signal with 480 effective scanning lines (hereinafter referred to as 480p), a progressive signal with 720 effective scanning lines (hereinafter referred to as 720p), a progressive signal with 1080 effective scanning lines (hereinafter referred to as 1080p), and the like. .

  On the other hand, in a television receiver or a personal computer display for displaying these video signals, a displayable video size is determined. In some cases, it is necessary to change the display size. For example, when a video signal called VGA having a video area of 640 × 480 is input to a display having a displayable video size of 1024 × 768, an enlargement process is performed in order to display the entire screen. Need to be output.

  Various prior arts relating to such format conversion have already been proposed. For example, the video display device described in Patent Document 1 provides a video signal processing device and a video display device capable of converting an input video signal of a plurality of formats into a single format that is practically the best and displaying it. The present invention also provides a video signal processing device and a video display device capable of displaying extremely high-quality video while minimizing an increase in hardware scale and complexity of signal processing. The purpose is to unify the format to 1440i or 1440p, thereby minimizing the hardware scale of the interpolation filter that constitutes the format conversion processing circuit and realizing video signal processing with little image quality degradation. It is.

  The digital broadcast receiving apparatus described in Patent Document 2 is a method in which a viewer manually switches screen settings in a video with captions, a video with a band on the top and bottom, a video with a side panel described above, a data broadcast video, and the like. In view of the inconvenience that it is necessary to re-set the channel and program contents to change to the video of your choice every time the channel or program content changes, it is preferable to process the video based on the broadcast video format. It is an object of the present invention to provide a digital broadcast receiving apparatus that can go and display a screen. The video format is discriminated as a video processing judgment material.

  The video display device described in Patent Document 3 is intended to provide a video display device that can be viewed in an optimal video format with a receiver connected to a plurality of different video formats. By providing display control means capable of sequentially outputting and input means for voice inquiry for determining whether or not the plurality of different video format signals can be displayed on the receiver, the user can respond to the voice inquiry. It is possible to display in an optimal video format according to the connected receiver simply by making settings.

Patent Document 4 aims to provide a digital broadcast receiver that can automatically switch the format of a video signal in accordance with a connected television receiver, and can display to the digital broadcast receiver. The purpose is to provide a television receiver that can automatically switch the format of the video signal according to the format, and the television receiver itself is compatible with what format it supports. (Displayable format information) is provided, and the displayable format information is input to the digital broadcast receiver via the D terminal cable, so that the connected receiver on the digital broadcast receiver side It is possible to determine which format can be displayed and the optimum format. For example, it has the characteristics of being able to output a video signal and format conversion into the highest resolution format of) of the format displayable by the receiver.
JP 2002-218348 A JP 2003-333455 A JP 2005-117306 A JP 2001-189897 A

  By the way, as the video signal processing apparatus having the format conversion function as described above, for example, a digital broadcast tuner having the function and independent of the display (hereinafter, having a format conversion function independent of the display as described above). And a display panel having such a function (hereinafter, a display having such a format conversion function is referred to as an integrated panel). Normally, separate units are often sold as a set with a display panel that does not have a format conversion function. In such cases, the separate unit is set to output in a fixed format that matches the display panel. .

  A case where an integrated panel having a format conversion function is connected to such a separate unit (for example, when a new display is newly purchased) is sufficiently assumed. FIG. 3 is a block diagram showing a configuration when the integrated panel 12 is connected to a conventional separate unit 11. Here, it is assumed that a video signal of VGA (640 × 480) size is input to the separate type unit 11, and the separate type unit 11 outputs in a fixed format of 1080p, and the optimum display size of the integrated panel 12 is It is assumed that it is XGA (1024 × 768).

  In FIG. 3, when a VGA (640 × 480) size video signal is input to the separate unit 11, the input signal is temporarily stored in the memory unit 14, and then to the fixed format 1080p in the scaler unit 13. The conversion process is performed. In this case, enlargement processing is performed 3 times in the horizontal direction and 9/4 times in the vertical direction. Then, the signal converted into the 1080p format is input to the integrated panel 12. In the integrated panel 12, the input 1080p signal is reduced in the scaler unit 15 and then stored in the memory unit 16. In this case, the reduction process is performed 8/15 times in the horizontal direction and 32/45 times in the vertical direction. Thereafter, the video data stored in the memory unit 16 is output to the display unit 17 to display the video.

  As described above, when the separate unit 11 and the integrated panel 12 are connected and used, the format conversion process is performed on each of them, which may cause deterioration of the display image. In order to prevent this, the scaler unit 13 of the separate unit 11 is enlarged or reduced in accordance with the appropriate display size of the display unit 17 of the integrated panel 12 (format selected in the integrated panel 12). There is a method of outputting to the integrated panel 12 after the operation. According to this method, enlargement / reduction processing is not performed on the integrated panel 12 side, and deterioration of the image can be prevented.

However, the above method has a problem that the operation is very complicated because the user needs to perform the format conversion operation on the separate unit 11 side after grasping the format on the integrated panel 12 side.
Japanese Patent Application Laid-Open No. 2004-26883 discloses an example of solving such a complicated operation. However, in order to automatically obtain displayable format information as in Patent Document 4, a communication cable such as a D terminal cable must be provided separately. I must. Therefore, there is a problem that usable panels are limited.

  The present invention has been made in view of the above problems, and in the case where an integrated panel having a format conversion function is connected to a separate unit having a format conversion function, each of these is enlarged / reduced An object of the present invention is to provide a video signal processing apparatus having a configuration for preventing the deterioration of video due to being performed.

  According to a first aspect of the present invention, there is provided a video signal processing apparatus having a format conversion function for performing enlargement or reduction processing in a scaler unit so as to obtain a preset video format with respect to an input video signal format. An arbitrary video format is selected, and the scaler unit appropriately performs an enlargement or reduction process on the input video signal and outputs the converted video format, and the input video signal On the other hand, the video signal processing apparatus is provided with a through mode that outputs the signal as it is without performing format conversion.

  A second aspect of the present invention is a video signal processing apparatus having a format conversion function for performing enlargement or reduction processing in a scaler unit so as to obtain a preset video format with respect to the format of the input video signal. An arbitrary video format is selected, and the scaler unit appropriately performs an enlargement or reduction process on the input video signal and outputs the converted video format, and the input video signal And a through mode that outputs the signal as it is without performing format conversion, and includes a switching circuit that receives the input video signal and the output of the scaler unit and outputs one of them according to a mode switching instruction signal. This is a featured video signal processing apparatus.

  According to the video signal processing apparatus of the present invention, it is possible to switch between the format conversion mode and the through mode depending on whether or not the connected device has a format conversion function. Therefore, it is possible to prevent the video signal from being deteriorated due to the format conversion process being performed twice.

  A video signal processing apparatus according to the present invention includes a format conversion function for performing an enlargement or reduction process in a scaler unit so as to obtain a preset video format with respect to an input video signal format. A format conversion mode in which an arbitrary video format is selected, and the scaler unit appropriately performs an enlargement or reduction process on the input video signal and outputs the converted video format; and the input video signal On the other hand, a through mode for outputting the data as it is without performing format conversion is provided.

  The video signal processing apparatus according to the present invention is applied to a separate unit such as a digital broadcast tuner and an integrated panel integrated with a display, and is applied to at least one having a format conversion function. . And a format conversion mode in which the user selects an optimum format and performs format conversion, and a through mode in which the input video signal is output as it is without performing format conversion. It is. Hereinafter, the case where it is applied to a separate unit will be described as an example with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a separate type unit 18 as a video signal processing apparatus of the present invention. Components having the same functions as those in FIG. 3 showing the conventional configuration are denoted by the same reference numerals. It is. An input video signal from the video signal input terminal 10 is input to the scaler unit 21 and to the switching circuit 22. The video format instruction signal input from the video format instruction signal input terminal 19 is input to the enlargement / reduction processing unit 25 of the scaler unit 21. The video format instruction signal here is a signal input when the user selects a format in the format conversion mode. The mode switching signal input from the mode switching signal input terminal 20 is input to the switching circuit 22. This mode switching signal is a signal input when the format conversion mode and the through mode are switched.

The scaler unit 21 includes a signal determination unit 24 and an enlargement / reduction processing unit 25. After the format conversion process is performed on the input video signal by the scaler unit 21, the processed signal is switched to the switching circuit 22. Is output.
The signal discriminating unit 24 discriminates the format of the input video signal, and discriminates the signal from the horizontal synchronizing signal, the vertical synchronizing signal, the polarity of each synchronizing signal, and the like. The determination result here is input to the subsequent enlargement / reduction processing unit 25.

  The enlargement / reduction processing unit 25 is for performing enlargement / reduction processing so that the format of the input video signal becomes the video format selected by the user. First, the discrimination result in the signal discriminating unit 24 is compared with the video format selected by the video format instruction signal, and the enlargement / reduction ratio is calculated in the horizontal direction and the vertical direction, respectively. On the other hand, the input video signal is temporarily stored in the memory unit 14, and thereafter, enlargement or reduction processing is performed while reading out the signal from the memory unit 14 based on the calculated enlargement / reduction ratio. Along with the format conversion, the horizontal sync signal, the vertical sync signal, the polarity of each sync signal, and the like are also converted. The signal after the enlargement / reduction processing is performed in this manner is input to the switching circuit 22.

  The switching circuit 22 is one of the input video signal from the video signal input terminal 10 and the video signal after the format conversion from the enlargement / reduction processing unit 25 according to the mode switching signal input from the mode switching signal input terminal 20. Is output to the video signal output terminal 23. The mode switching signal is a signal that is input when the format conversion mode and the through mode are switched. In the case of the through mode, the mode switching signal is switched to the input video signal side from the video signal input terminal 10, and in the case of the format conversion mode. Is switched to the video signal side after the format conversion from the enlargement / reduction processing unit 25.

The operation of the present invention in the above configuration will be described.
The user needs to switch the mode depending on whether or not the display device connected to the separate unit 18 of the present invention has a format conversion function. Here, as in the description of the prior art, it is assumed that a VGA (640 × 480) size video signal is input to the separate unit 18, and the 1080p format is selected for the separate unit 18 before use. Assume that the optimum display size of the connected display device is XGA (1024 × 768).

When connected to a display device without a format conversion function, it is necessary to perform format conversion in the separate unit 18, and in such a case, the format conversion mode is set. In selecting the format, the user selects XGA (1024 × 768) which is the optimum display size of the display device. In this case, the switching circuit 22 is connected to the output side of the scaler unit 21.
When a VGA (640 × 480) size video signal is input to the scaler unit 21 in such a setting state, the video signal is temporarily stored in the memory unit 14 and the input video is input to the signal determination unit 24. It is detected that the signal is VGA (640 × 480) size, and the detection result is output to the enlargement / reduction processing unit 25. On the other hand, when the format is selected, the video format instruction signal is input to the enlargement / reduction processing unit 25 and the video format is set to XGA (1024 × 768). Are compared, and the enlargement ratio is calculated as 8/5 times in the horizontal direction and 8/5 times in the vertical direction. Based on this, the video signal is appropriately read out from the memory unit 14, and the enlargement process is performed to perform format conversion. . The video signal converted to the XGA (1024 × 768) size is output from the output terminal 23 via the switching circuit 22 and input to the connected display device.
By performing such processing, the video signal of the XGA (1024 × 768) size which is the optimum display size is input to the display device side and displayed appropriately.

On the other hand, when an integrated panel having a format conversion function is connected, format conversion processing is performed in the integrated panel, so that it is not necessary to perform format conversion in the separate unit 18. Set to mode. When the through mode is selected, the switching circuit 22 is directly connected to the line from the video signal input terminal 10.
Therefore, when a VGA (640 × 480) size video signal is input to the video signal input terminal 10 in such a setting state, this video signal is output via the switching circuit 22 without any processing being performed. The signal is output from the terminal 23 and input to the connected integrated panel.
By performing such processing, if the video format is set to the XGA (1024 × 768) size, which is the optimum display size, on the integrated panel side, the format conversion is performed appropriately and the display device unit Will be displayed.

  As described above, according to the separate unit 18 as the video signal processing device according to the present invention, the format conversion mode and the through mode are switched depending on whether or not the connected display device has the format conversion function. It can be used, and it can be set so that the format conversion process is performed only once on either side, so that the deterioration of the video signal due to the format conversion process being performed twice can be prevented. it can.

  The separate unit 18 as the video signal processing apparatus according to the first embodiment of the present invention includes a format conversion mode for performing video enlargement / reduction processing by designating a video format, and a through that outputs the video signal as it is without processing. The format conversion mode and the through mode are switched by the switching circuit 22 and used. However, the present invention is not limited to this configuration. For example, the configuration shown in FIG. 2 may be used.

  FIG. 2 is a block diagram showing a configuration of a separate unit 18 as a video signal processing apparatus of the present invention. In the first embodiment, the same reference numerals are given to the same function portions as those in FIG. Is omitted. 2 differs from FIG. 1 in that the mode switching signal input from the mode switching signal input terminal 20 is input to the enlargement / reduction processing unit 27 of the scaler unit 26, and the enlargement / reduction processing of the scaler unit 26. The video signal from the unit 27 is directly connected to the video signal output terminal 23. Also in FIG. 2, the format conversion mode in which the video format is specified and the video is enlarged / reduced and the through mode in which the video signal is output without being processed are the same as in the first embodiment. .

The operation of the present invention in such a configuration will be described.
First, when the format conversion mode is set, the enlargement / reduction processing unit 27 compares the discrimination result of the signal discrimination unit 24 with the set video format to calculate the video enlargement / reduction ratio, The format conversion process is performed based on this, and since this is the same as in the first embodiment, detailed description thereof is omitted.
Next, when the through mode is selected, the mode switching signal from the mode switching signal input terminal 20 is input to the enlargement / reduction processing unit 27. The enlargement / reduction processing unit 27 performs the same magnification processing on the input video signal and outputs it to the video signal output terminal 23 regardless of the video format set before that when the through mode is set. That is, the data is output as it is without performing enlargement or reduction processing. By performing such processing, if the video format is set to the optimum display size on the connected integrated panel side, the format is appropriately converted and displayed properly on the display unit. Become.

  With this configuration, it is possible to switch between the format conversion mode and the through mode depending on whether or not the connected display device has a format conversion function. Since the format conversion process can be set to be performed, it is possible to prevent the video signal from being deteriorated due to the format conversion process being performed twice.

  In the first and second embodiments, the configuration in which the format conversion mode and the through mode are switched to the separate unit 18 having the format conversion function is applied, but the present invention is limited to this. However, the same effects as those of the present invention can be obtained even if the same configuration is applied to an integrated panel having a format conversion function.

It is a block diagram showing the structure of the separate type | mold unit 18 as a video signal processing apparatus of this invention. It is a block diagram showing other composition of separate type unit 18 as a video signal processor of the present invention. It is a block diagram showing the example of a connection of the conventional separate type | mold unit 11 and the integrated panel 12. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Video signal input terminal, 11 ... Separate type unit, 12 ... Integrated panel, 13 ... Scaler part, 14 ... Memory part, 15 ... Scaler part, 16 ... Memory part, 17 ... Display device part, 18 ... Separate type unit , 19 ... Video format instruction signal input terminal, 20 ... Mode switching signal input terminal, 21 ... Scaler section, 22 ... Switching circuit, 23 ... Video signal output terminal, 24 ... Signal discrimination section, 25 ... Enlargement / reduction processing section, 26 ... Scaler unit, 27... Enlargement / reduction processing unit.

Claims (2)

  A video signal processing apparatus having a format conversion function for performing a scaling process in a scaler unit so as to be a video format set in advance with respect to a format of an input video signal. A format conversion mode for selecting and outputting the converted video format by appropriately enlarging or reducing the input video signal in the scaler unit, and without performing format conversion on the input video signal A video signal processing apparatus comprising a through mode for outputting as it is.   A video signal processing apparatus having a format conversion function for performing a scaling process in a scaler unit so as to be a video format set in advance with respect to a format of an input video signal. A format conversion mode for selecting and outputting the converted video format by appropriately enlarging or reducing the input video signal in the scaler unit, and without performing format conversion on the input video signal A video signal processing apparatus comprising: a through mode that outputs the signal as it is; and a switching circuit that receives the input video signal and the output of the scaler unit and outputs one of them according to a mode switching instruction signal.

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