JP5248641B2 - Video signal processing apparatus and video signal processing method - Google Patents

Description

  The present invention relates to a video signal processing apparatus and a video signal processing method, for example.

  With the start of terrestrial digital broadcasting, a large number of television devices (hereinafter referred to as “HDTV”) equipped with a large-screen liquid crystal flat panel (hereinafter referred to as “full HD panel”) capable of full-spec high-definition display have been commercialized.

  The HDTV has external video signal input terminals such as an HDMI terminal and a D terminal. For example, by inputting a game video of a game device to the D terminal, the game video can be displayed on a large screen and enjoyed. .

  By the way, the resolution of the game video input from the game device to the D terminal is, for example, 480P (720 × 480 progressive). If this video is simply displayed dot-by-dot, the video with a small angle of view is displayed in the full HD panel. Usually, a scaling process for enlarging the screen to the full screen is performed.

  However, when an enlarged display is performed on a screen having an aspect ratio different from that of the input source video, the roundness ratio is lost, the video is flattened, and the viewer feels uncomfortable.

  In this way, when the video aspect ratio of the input source and the aspect ratio of the display panel are different, as a technique for displaying while maintaining the roundness, for example, a digital video signal is displayed in the horizontal direction of the digital data according to the horizontal resolution of the display device. Disclosed is a video signal processing device that can display a high-definition video even when the input video resolution and the display device resolution are different by setting the sampling frequency so that the number of samples does not need to be scaled (For example, refer to Patent Document 1).

JP 2006-227442 A

  However, in the case of the above conventional technique, although there is a description about the aspect ratio of 4: 3 → 16: 9 and 16: 9 → 4: 3, the aspect ratio of 3: 2 such as game video is set to 16: 9. There was no description about the technology, and there was a problem that enlarged display could not be performed while maintaining the roundness of the game image.

  The present invention has been made to solve such a problem, and performs enlarged display while maintaining the roundness of the video input to the external video signal input terminal, and provides high-quality video without image quality deterioration. An object of the present invention is to provide a video signal processing apparatus and a video signal processing method that can be displayed.

In order to solve the above problems, a video signal processing apparatus according to the present invention includes an input unit and a video conversion unit. The input unit inputs a video signal from an external device. The video conversion unit is a video conversion unit that selectively performs conversion processing on the input video signal between the first mode and the second mode, and in the case of the first mode, Sampling the video signal at a sampling frequency of 72 MHz in the horizontal direction, capturing the video signal as the number of input lines in the vertical direction, and executing scaling processing and edge correction processing at 2.25 times in the vertical direction; wherein when the second mode, sampling the video signal at a sampling frequency of 64MHz in the horizontal direction, fetches remain number of lines to input the video signals to the vertical direction, performs vertical scaling twice By performing no edge correction in the vertical direction, display processing is performed so that the aspect ratio is the same as the display screen.

  According to the present invention, it is possible to perform enlarged display while maintaining the roundness of the video input to the external video signal input terminal, and to display a high-quality video without image quality deterioration.

It is a figure which shows the structure of the video signal processing apparatus of one Embodiment of this invention. It is a figure which shows an example of a video menu. It is a figure which shows an example of a game screen menu. It is a figure which shows an example of the sampling frequency in a horizontal effective period. It is a figure which shows the example which displayed the game image by 1708 * 960 pixels on the full HD panel. It is a figure which shows the example which displayed the game image | video by 1920 * 1080 pixels on the full HD panel.

  Hereinafter, a television apparatus according to an embodiment of the video signal processing apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a television device.

  As shown in FIG. 1, the television apparatus of this embodiment includes a remote controller 1 (hereinafter referred to as “remote controller 1”) as an operation unit, a video signal processing unit 2, and a large-screen liquid crystal capable of full spec high-definition display. A flat panel 3 (hereinafter referred to as “full HD panel 3”) is provided. The operation unit may be a button provided on the television main body in addition to the remote controller 1.

  The full HD panel 3 has a screen of full HD size (1920 × 1080 pixels) (aspect ratio 16: 9). This screen has a resolution that is at least twice the number of lines in the vertical direction of a 720 × 480 pixel (aspect ratio 3: 2) game video, and draws video with arbitrarily specified horizontal and vertical display pixels. Is possible. The video output from the video signal processing unit 2 is displayed on this screen.

  The remote controller 1 is connected to the video signal processing unit 2 by wireless communication such as infrared communication. The remote controller 1 is provided with a large number of buttons for operating functions incorporated in the television device. A command is issued from an infrared transmission unit (not shown) by operating a desired button, and the command is displayed as a video. The CPU 20 receives through the infrared receiving unit 10 of the signal processing unit 2 and executes processing according to the command.

  For example, as shown in FIG. 2, the CPU 20 displays a video menu 30 in which setting items are arranged vertically on the screen of the full HD panel 3 by operating a video menu button on the remote controller 1. Setting items of the video menu 30 include, for example, “Random”, “Azayaka”, “Standard”, “Movie”, “TV Pro”, “Movie Pro”, “Game”, “PC Fine”, “Memory”, and the like. .

  When the viewer designates a setting item such as “game” 31 from the video menu using the remote controller 1, the CPU 20 stores “game mode” in the memory 19 as an operation mode, and controls the screen in “game mode”. I do.

  When the viewer operates the game screen menu button of the remote controller 1 in the “game mode”, the CPU 20 displays a game screen menu 32 as shown in FIG. In this game screen menu 32, three screen setting items such as “game normal”, “retro game fine”, and “game full” are cyclically displayed, and the next item is displayed each time the item designation button is operated. The screen can be set to a desired screen. That is, the game screen menu 32 is a game-specific screen setting menu for designating the angle of view of the game video (the size of the game screen) in the game mode. The game screen menu 32 shown here is merely an example, and other examples are conceivable.

  “Game normal” is a setting for displaying the input game video as it is. “Retro Game Fine” is a setting suitable for displaying a game screen giving priority to image quality and playing a retro game that was enjoyed in the past with a clear image with a sense of dots. “Game Full” is a setting for displaying a game screen that prioritizes the size of the screen, for example, displaying the game screen in a full 16: 9 screen.

  In this menu, the three screen setting items are cyclically repeated. However, like the video menu 30 shown in FIG. 2, the setting items are arranged vertically and the setting items can be selected by operating the buttons in the vertical direction. You may make it select.

  The video signal processing unit 2 includes an infrared receiver 10, a D terminal 11, a low-pass filter (LO) 12, an analog / digital converter 13 (hereinafter referred to as “A / D converter 13”, an I / P converter 14, scaling Section 15, image quality processing section 16, panel I / F 18, memory 19, and the like.

  The infrared receiver 10 receives a button operation command issued from the remote controller 1 and transmits it to the CPU 20.

  The D terminal 11 combines analog component terminals into one, and the video type (number of scanning lines, frame rate, I / P information (interlace signal / progressive signal information), aspect ratio, etc.) from the control line. This is a video signal input terminal that can be sent as format information.

  For example, a D terminal cable from a portable game device is connected to the D terminal 11, and an analog video signal having a resolution of 480P (720 × 480 progressive) is input. Hereinafter, this video signal is referred to as a game video.

  The low-pass filter (LO) 12 is a band filter for filtering an unnecessary band when sampling data from an analog video signal (game video) input from the D terminal 11. That is, the low-pass filter (LO) 12 passes a frequency band necessary for sampling a video according to the Nyquist definition.

  The A / D converter 13 samples the video signal in the band passed by the low-pass filter (LO) 12 at the sampling frequency specified by the CPU 20 (64 Mhz for “Retro Game Fine” and 72 Mhz for “Game Full”). , Converted into digital video data and stored in the memory 19.

  That is, the A / D conversion unit 13 generates digital video data by sampling an analog video signal having a predetermined resolution input from the outside at a specified sampling frequency.

  The I / P converter 14 reads the digital video data stored in the memory 19 according to the control signal 102 from the CPU 20, converts the I (interlace) signal into a P (progressive) signal, and stores it in the memory 19. In the case of a game video, since the original video signal is a progressive signal, I / P conversion is not performed.

The scaling unit 15 reads out the progressive video stored in the memory 19 through the I / P conversion unit 14 from the memory 19 by the control signal 103 from the CPU 20 and controls the scaling process, that is, the enlargement ratio such as enlargement or reduction. In this example, since the screen of the full HD panel 3 is larger than the original video, the video is enlarged.
The scaling unit 15 has a scaling filter that corrects the edge (edge correction) of the image in the horizontal and vertical directions. The horizontal scaling filter is called a horizontal scaling filter, and the vertical scaling filter is called a vertical scaling filter.
The scaling unit 15 performs edge correction on the enlarged or reduced image outline (edge) by the edge correction function of the scaling filter in each of the horizontal and vertical directions. Edge correction is a process of blurring and smoothing the outline of an image.

The scaling unit 15 can perform horizontal and vertical scaling and filtering on the video data generated by the A / D conversion unit 13 and functions as a video conversion unit that performs processing under the control of the CPU 20. To do.
For example, when “retro game fine” is specified, the scaling unit 15 scales at least one of the horizontal display pixels and the vertical display pixels of the video data generated by the A / D conversion unit 13. (Enlargement rate control) and filtering (turning off the edge correction function of the scaling filter) are not performed.

  The image quality processing unit 16 adjusts the image quality of the video according to the instruction by the control signal 104, that is, performs gamma correction and image quality correction of the video. The panel I / F 18 is an interface for drawing (outputting) the video through the image quality processing unit 16 on the screen of the full HD panel 3, and converts the video into a signal format compliant with the panel standard.

  For example, when “Retro Game Fine” is specified in “Game Mode”, horizontal scaling (magnification control) and edge correction by the horizontal scaling filter are not performed, and scaling in the vertical direction is doubled (integer multiple). And edge correction by the vertical scaling filter is not performed. Note that image quality adjustment (gamma correction, image quality correction, etc.) is performed as usual.

  When “Game Full” is specified in “Game Mode”, horizontal scaling (enlargement ratio control) and edge correction by the horizontal scaling filter are not performed, and 2.25 times scaling and vertical scaling are performed only in the vertical direction. Perform edge correction with a filter. Note that image quality adjustment (gamma correction, image quality correction, etc.) is performed as usual.

  The memory 19 is a dynamic RAM or the like, and is a temporary storage location for video data being processed. The memory 19 functions as a work area for the CPU 20 to process data.

  The CPU 20 receives an input of a predetermined video display mode (when “retro game fine” is selected and input in the “game mode” setting or “game full” is selected and input in the “game mode” setting). Functions as a reception unit. In addition, the CPU 20 outputs control signals 101 to 104 to each of the above units, and performs control for rendering an image on the screen of the full HD panel 3. When receiving input of a predetermined video display mode, the CPU 20 controls the sampling frequency so that the horizontal display pixels of the video data are close to the number of pixels of the full HD panel 3 and does not perform the horizontal scaling process. The scaling unit 15 is controlled.

  Specifically, for example, when the operation mode is “game mode” and “retro game fine” is designated in the game screen menu, the CPU 20 controls each unit as follows.

  The control signal 101 is output to the A / D converter 13 so that the frequency of the sampling clock in the horizontal effective period is raised to 64 MHz and the 480 lines are captured in the vertical direction. The control unit 103 outputs the control signal 103 so that the scaling unit 15 is not scaled in the horizontal direction, is scaled twice in the vertical direction, and is not subjected to edge correction by the vertical scaling filter. A control signal 104 is output to the image quality processing unit 16 so as to perform image quality adjustment (gamma correction, image quality correction, etc.) according to existing settings.

  That is, when the “game mode” and “retro game fine” are specified, the CPU 20 sets the sampling frequency of the horizontal effective period of the A / D converter 13 to 64 MHz and sets the vertical direction to the game. While the number of video lines is captured, the scaling unit 15 is controlled not to perform horizontal scaling but to scale the vertical direction by an integral multiple.

  For example, when the operation mode is “game mode” and “game full” is designated in the game screen menu, the CPU 20 controls each unit as follows.

  The control signal 101 is output to the A / D converter 13 so that the sampling clock frequency in the horizontal effective period is raised to 72 MHz and the 480 lines are captured in the vertical direction. A control signal 103 is output so that the scaling unit 15 is not scaled in the horizontal direction, is scaled by 2.25 times in the vertical direction, and is subjected to edge correction by a vertical scaling filter.

  That is, when “game mode” and “game full” are designated, the CPU 20 sets the sampling frequency for the horizontal effective period of the A / D converter 13 to 72 MHz and sets the vertical direction to the game image. While the number of lines is taken in, the scaling unit 15 is controlled not to perform horizontal scaling but to scale and filter (apply a vertical scaling filter) in the vertical direction by 2.25 times.

Next, the operation of this television apparatus will be described with reference to FIGS.
In this television apparatus, when a game video (for example, 480p) is input to the D terminal 11, A / D conversion is performed after band filtering. Thereafter, the scaled, filtered and image quality adjusted video is displayed on the full HD panel 3.

  Conventionally, when the control signal 101 is input from the CPU 20 to the A / D conversion unit 13, the A / D conversion unit 13 sets the sampling clock to 27 MHz and samples data from the input video. The image was captured in the memory 19 at an angle of view of x480 pixels (aspect ratio 3: 2).

  When the screen size of the display panel is full HD size (1920 × 1080 pixels) (aspect ratio 16: 9), dot-by-dot display with 720 × 480 pixels (aspect ratio 3: 2) will result in a display panel screen size of On the other hand, the display size of the game image is very small, and the aspect ratio 3: 2 of the game image is different from the aspect ratio 16: 9 of the display panel.

  For this reason, the CPU 20 normally outputs the control signal 103 to the scaling unit 15 so as to always perform image conversion both horizontally and vertically on the video data fetched into the memory 19, and uniformly scales and filters the video data. Since the video data was output to the full HD panel 3, the game video input to the full HD panel 3 was enlarged and displayed, but the image was blurred.

  On the other hand, when the operation mode of the screen control is set to “game mode” in the video menu (see FIG. 2) and “retro game fine” is set (designated) in the game screen menu (see FIG. 3). The CPU 20 outputs a control signal 101 to the A / D converter 13 so that the frequency of the sampling clock in the horizontal direction is raised to 64 MHz and the 480 lines are captured in the vertical direction. Further, the CPU 20 outputs a control signal 103 so that the scaling unit 15 does not perform horizontal scaling, and performs scaling in the vertical direction by a factor of two.

  By this control, as shown in FIG. 4, the A / D converter 13 sets the sampling clock frequency in the horizontal effective period to 64 MHz, and performs 1708 samplings in the horizontal effective period of 26.66 μs. As a result, the horizontal effective pixels are sampled at 1708 pixels, and a screen on which 1708 pixels of the sampled horizontal effective pixels are pasted is output. In the vertical direction, the A / D conversion unit 13 takes in 480 lines, and the scaling unit 15 scales (enlarges) twice (960 lines).

  As a result, as shown in FIG. 5, the game video 51 is displayed on the screen 52 of the full HD panel 3 with 1708 × 960 pixels (16: 9 aspect ratio). At this time, since the vertical enlargement ratio is an integral multiple (twice), even if the scaling unit 15 does not perform horizontal scaling and filtering, the same color information is written to the horizontal line, that is, shaken twice. Thus, the game image can be displayed on the full HD panel 3 without a sense of incongruity while maintaining the roundness.

Next, another operation example will be described with reference to FIG.
When the operation mode of the screen control is set to “game mode” in the video menu (see FIG. 2) and “game full” is set (designated) in the game screen menu (see FIG. 3), the CPU 20 A control signal 101 is output to the A / D converter 13 so as to raise the frequency of the sampling clock to 72 MHz. Further, the CPU 20 outputs the control signal 103 so that the scaling unit 15 does not perform horizontal scaling and performs scaling by 2.25 times in the vertical direction.

  In response to the input of the control signal 101, the A / D converter 13 increases the sampling clock frequency to 72 MHz and samples the number of horizontal effective pixels at 1920 pixels. Further, the scaling unit 15 pastes 1920 pixels as it is on the game screen without performing horizontal scaling processing.

  For the vertical direction, the A / D conversion unit 13 captures video data with 480 lines, and the scaling unit 15 performs a scaling process so that the vertical direction is expanded to 1080 lines of 2.25 times. Note that since the scaling (enlargement ratio) in the vertical direction is not an integer multiple, the scaling unit 15 performs edge correction on the enlarged image using a vertical scaling filter. The horizontal scaling filter is turned off. As a result, as shown in FIG. 6, a full HD (1920 × 1080 pixels) game video 51 enlarged to the full screen 52 of the full HD panel 3 is displayed on the full HD panel 3. Also in this case, the roundness is maintained.

  Note that the enlargement factor in the vertical direction (2.25 times = 1080/480) is not an integer value. Therefore, although it is necessary to perform edge correction by turning on the vertical scaling filter, the scaling and filtering are performed in the horizontal direction. Full HD display can be performed without processing, satisfying full HD television specifications, and increasing the commercial value of the television.

  As described above, according to the television apparatus of this embodiment, when the operation mode of the screen control is set to “game mode” and “retro game fine” is designated in the game screen menu, the A / D conversion unit 13 is set. By raising the sampling frequency during the horizontal effective period to 64 MHz, the game image can be enlarged and displayed on the full HD panel 3 without destroying the aspect ratio of the original image input from the game device to the D terminal 11. Further, since horizontal scaling and filtering are not performed, there is no deterioration in image quality, and a realistic game image created by the game creator can be displayed.

  That is, it is possible to display a game image while maintaining the 16: 9 aspect ratio (aspect ratio) and the roundness ratio without performing horizontal scaling and filtering. Further, by turning off the edge correction function of the scaling filter of the scaling unit 15 and performing enlarged display, the contour of the video can be displayed clearly.

In other words, the display is enlarged while maintaining the roundness of the game video input to the D terminal 11, and the high-quality game video without image quality deterioration is displayed on the full HD panel 3, thereby making the viewer realistic. You can enjoy game images.
Recently, by connecting the game device to a network such as the Internet, it became possible to download retro games that were enjoyed in the past to the game device, so by setting the menu setting “Retro Game Fine”, You can play retro games with clear images with a sense of dots.

  In addition, this invention is not limited only to the said embodiment, You may deform | transform a component in the range which does not deviate from the summary in an implementation stage.

  In the above embodiment, three modes such as “game normal”, “retro game fine”, and “game full” are provided, but only one of “retro game fine” and “game full” is provided. Good.

Moreover, although the said embodiment demonstrated the case where the game image input is 480p, since it may be 720p other than 480p, for example, this case is demonstrated.
The CPU 20 acquires the format information of the video input from the control line of the D terminal 11, and the input video of the game video is 480p based on the video type (number of scanning lines, frame rate, I / P information, aspect ratio, etc.). Or 720p. At 480p, the above-described processing is executed.

  On the other hand, when it is determined from the video format information that the input game video is 720p, the viewer selects “game” from the video menu 30 shown in FIG. 2 and sets the operation mode to “game mode”. Even if the game screen menu 32 of FIG. 3 is displayed and “retro game fine” is specified, the CPU 20 switches the item name to “dot by dot”.

  That is, as a result of the determination, when the video type is 480p, the CPU 20 displays an item for video conversion on the game screen menu 32 when the operation mode is “game mode”, while the video type. If the game mode is not 480p, that is, 720p, the game screen menu 32 displays an item for dot-by-dot display even when the operation mode is “game mode”.

Thus, in the case of 720p, the game video input to the video signal processing unit 2 is output to the full HD panel 3 without being enlarged / reduced and displayed on the screen.
Even when a non-480p game image is input and displayed on the screen without being enlarged, if it is 720p, a roundness of 100% is secured with an aspect ratio of 16: 9, and there is no degradation of the image due to scaling. The number of pixels is larger than that of the video, making it easy to view.
In other words, the user can be provided with the optimal screen size and image quality by displaying the dot-by-dot menu without displaying the retro game fine menu in 480p and the retro game fine menu in 720p.

Each component described in the above embodiment may be realized by a program installed in a storage such as a hard disk device of a computer, and the program is stored in a computer-readable electronic medium: program The computer may realize the functions of the present invention by causing the computer to read from the electronic medium. Examples of the electronic medium include a recording medium such as a CD-ROM, flash memory, and removable media.
Further, the configuration may be realized by distributing and storing components in different computers connected via a network, and communicating between computers in which the components are functioning.

  DESCRIPTION OF SYMBOLS 1 ... Remote controller (remote control), 2 ... Video signal processing unit, 3 ... Large-screen liquid crystal flat panel (full HD panel), 10 ... Infrared receiving part, 11 ... D terminal, 13 ... Analog / digital conversion part (A / D) Conversion unit), 14 ... I / P conversion unit, 15 ... scaling unit, 16 ... image quality processing unit, 19 ... memory, 20 ... CPU.

Claims (6)

An input unit for inputting a video signal from an external device;
A video conversion unit that performs conversion processing on the input video signal by selectively switching between the first mode and the second mode, and in the case of the first mode, 72 MHz in the horizontal direction. The video signal is sampled at the sampling frequency of the vertical direction, the video signal is captured in the vertical direction as it is, and the scaling process and the edge correction process are executed at 2.25 times in the vertical direction. in the case of, sampling the video signal at a sampling frequency of 64MHz in the horizontal direction, it fetches remain number of lines to input the video signals to the vertical direction, performs vertical scaling twice, the edge in the vertical direction By not performing correction, a video conversion unit that performs display processing so as to have the same aspect ratio as the display screen,
A video signal processing apparatus comprising:   A display that displays the video output from the video conversion unit on a screen that has a resolution that is at least twice the number of lines in the vertical direction of the video signal and can draw video with an arbitrary number of horizontal and vertical display pixels. The video signal processing apparatus according to claim 1, further comprising a panel.   3. The video signal processing apparatus according to claim 1, wherein a menu for selecting the first mode or the second mode is displayed. From the video format information acquired through the control line of the terminal to which the video signal is input, determine whether the type of the video signal is 720 × 480 progressive,
When the video signal type is 720 × 480 progressive, an item for switching the operation mode to the first mode or the second mode is displayed on the menu, while the video signal type is not 720 × 480 progressive. 4. The video signal processing apparatus according to claim 3, wherein an item for performing dot-by-dot display is displayed on the menu instead of an operation mode switching item. A reception unit for receiving an input of a mode for displaying an image;
Sampling game video input from game devices at an arbitrary sampling frequency to generate video data, and horizontal and vertical scaling of the generated video data and edge correction processing using a scaling filter are possible. A video conversion unit that performs processing under control;
When an input of a game mode for enlarging and displaying the game video is received by the reception unit, the sampling frequency is controlled for the video conversion unit, and horizontal and vertical scaling and edge correction processing by a scaling filter are performed. And a control unit for controlling
The controller is
When the mode is a game mode for displaying a 720 × 480 progressive game video, in this game mode, the sampling frequency of the horizontal effective period of the video conversion unit is set to 64 MHz, and the vertical direction is the number of game video lines. while the incorporation of game images remain, the without edge correction by horizontal scaling and scaling filters for image converter, the vertical scaling performed twice, and the edge correction by vertical scaling filter A video signal processing apparatus which is controlled so as to have the same aspect ratio as that of the display screen. In a video signal processing method for performing conversion processing on a video signal input from an external device by selectively switching between a first mode and a second mode,
In the case of the first mode, the video signal is sampled at a sampling frequency of 72 MHz in the horizontal direction, the video signal is captured in the vertical direction as the number of input lines, and is scaled by 2.25 times in the vertical direction. Processing and edge correction processing,
Wherein when the second mode, sampling the video signal at a sampling frequency of 64MHz in the horizontal direction, fetches remain number of lines to input the video signals to the vertical direction, performs vertical scaling twice A video signal processing method characterized in that display processing is performed so that the aspect ratio is the same as that of the display screen by not performing edge correction in the vertical direction.

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