JP2011040974A - Display control device, and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To present high quality video contents by performing resolution conversion of main video contents only in the latter stage when performing multi-screen display in a display control device provided with a resolution converting part that can perform higher performance resolution conversion in the latter stage than in the former stage. <P>SOLUTION: Only sub video contents is subjected to resolution conversion in the former stage in accordance with a ratio of the main video contents to the sub video contents in an output of the final multi-screen display, and is combined with the main video contents, and the combined video contents that is acquired is subjected to resolution conversion in the latter stage. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display control apparatus and a control method thereof, and more particularly to a display control apparatus and a control method thereof capable of displaying a plurality of video contents on a multi-screen.

  The resolution of the display area of a display control device such as a television receiver has been increased with the spread of video content having a high resolution such as digital television broadcasting in recent years. Compared with video content having a high resolution (for example, 1920 × 1080 pixels), the video content that has been popular in the past has a low resolution (for example, 720 × 480 pixels) and is displayed on a display device having a high-resolution display area. Resolution conversion processing is necessary. However, simply applying resolution conversion to low-resolution video content displays an enlarged version of the video content, giving the user the impression that the image quality has deteriorated. A display device having an image quality improvement processing circuit for improving the image quality of the video content against the image quality deterioration due to the resolution conversion of the video content having a low resolution is also commercially available. The image quality enhancement processing includes, for example, noise reduction, enhancement / attenuation of high frequency components of the luminance signal, edge enhancement, color correction, and the like. By using the luminance information and contrast information of the video content, the image quality of the input video content Is corrected.

  In addition, the display area of the display device, and the resolution and aspect ratio of video content vary with the diversification of display devices and video standards. For example, in a television receiver, the resolution of video content differs greatly between the conventional analog broadcast standard and the terrestrial digital broadcast standard, so the display resolution also differs. Also, the aspect ratio of the video content and the display area has changed from 4: 3 to 16: 9.

  Therefore, in order to display video content having various resolutions and aspect ratios in the display area of the display device, it is necessary to apply resolution conversion processing according to the resolution and aspect ratio of the display area. However, it is not practical to provide a separate resolution conversion circuit for each combination of resolution and aspect ratio of video content and display area. For this reason, it is proposed to prepare circuits that perform different resolution conversions, and to apply resolution conversion that can be realized by individual circuits to video content in multiple stages, thereby realizing desired resolution conversion processing and reducing the circuit scale. ing. In Patent Document 1, a circuit that performs resolution conversion in the vertical and horizontal directions and a circuit that performs resolution conversion only in the horizontal direction are provided, and only the latter is applied to video content that does not require vertical resolution conversion. It supports various resolution conversions without providing a conversion circuit.

JP 2007-13739 A

  A typical television receiver includes a broadcast receiving LSI that receives and decodes a broadcast signal. The broadcast receiving LSI can receive not only the received broadcast content but also stored video content input from a video playback device such as a DVD player, and can output it to the display panel of the television receiver. In addition, the broadcast receiving LSI has a function of converting the resolution of video content and a composition function of synthesizing a plurality of video contents, and realizes a multi-screen display of the plurality of video contents.

  When performing multi-screen display on a general television receiver, the broadcast receiving LSI applies resolution conversion processing to a plurality of video contents, and further displays the plurality of video contents subjected to resolution conversion on a display panel. Combine and output composite video content. For this reason, the broadcast receiving LSI has one system of video output.

  In addition, in general television receivers, in order to apply image quality enhancement processing to output video content, an image quality enhancement LSI is further added, and the video content output by the broadcast reception LSI is enhanced. And apply the image quality enhancement process. Since the video output provided in the broadcast receiving LSI is generally one system, the video input of the high quality LSI is inevitably one system, and the high quality LSI performs high quality processing on the input video content of one system. Will be applied. On the other hand, the high image quality LSI includes a resolution conversion circuit in order to provide a high image quality processing function corresponding to various input / output resolutions. The effect of the high image quality processing depends on the quality of the video content to which the high image quality processing is applied. Therefore, in order to obtain a good image quality improvement processing result, the image quality improving LSI generally provides a higher resolution conversion function than the resolution conversion function provided in the broadcast receiving LSI. Accordingly, when the video content displayed by the television receiver including the broadcast receiving LSI is improved in quality using the high quality LSI, the resolution provided in the high quality LSI is higher than the resolution conversion function provided in the broadcast receiving LSI. It is preferable to use the conversion function. That is, when performing single screen display (single-line display), it is better to apply the resolution conversion process provided in the high quality LSI than the resolution conversion process provided in the broadcast receiving LSI. However, when performing multi-screen display, since the high quality LSI can only handle one system of video input, it is necessary to apply resolution conversion and synthesis processing in the broadcast receiving LSI. For this reason, there has been a problem that the image quality improvement processing by the image quality improvement LSI cannot be obtained sufficiently for the video content during multi-screen display.

  Also, consider a case in which resolution conversion processing is applied by a high image quality LSI for single screen display (single system display) and a broadcast reception LSI for multi-screen display depending on the screen display form of the television receiver. At this time, since the image quality changes depending on whether the screen display form is a single screen display or a multi-screen display, the user feels uncomfortable. In particular, the display area of the secondary video content is displayed so as to overlap the display area of one main video content, such as picture-in-picture (PinP) display, which is one of the multi-screen display methods. In the case of the display form, the difference in image quality appears remarkably. That is, for example, there is no difference in the size of the display area of the video content displayed on a single screen and the display area of the main video content in the PinP display, but there may be a situation where the image quality is different.

  The present invention has been made in view of the above-described problems. The present invention is capable of displaying a plurality of video contents in a multi-screen, and enabling efficient use of a plurality of resolution conversion functions in a display control apparatus and a control method thereof having a plurality of resolution conversion functions having different performances. With the goal.

In order to achieve the above object, a display control apparatus of the present invention comprises the following arrangement.
Of the plurality of input video contents, the former resolution conversion means for converting and outputting the sub video contents, and among the input plurality of video contents, one main video content; The sub video content output from the previous resolution conversion unit is combined into a multi-screen display form and output as a composite video content of one system, and connected to the combining unit and output from the combining unit A rear-stage resolution converting means for converting and outputting the video content, and a control means for controlling operations of the previous-stage resolution converting means, the subsequent-stage resolution converting means, and the synthesizing means; In accordance with the ratio of the main video content and the sub video content, the resolution of the sub video content by the previous resolution conversion means And performing conversion.

  With such a configuration, according to the present invention, a plurality of video content can be displayed on a multi-screen, and a display control apparatus and a control method thereof having a plurality of resolution conversion functions with different performances can efficiently use a plurality of resolution conversion functions. Can be used for

The block diagram which shows the function structural example of the television receiver which concerns on embodiment of this invention. FIG. 4 is a diagram for explaining picture-in-picture display according to the first embodiment. The flowchart for demonstrating the multiscreen display process in a television receiver. FIG. 6 is a view for explaining picture and picture display according to the second embodiment.

  Hereinafter, preferred and exemplary embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below is an example in which the present invention is applied to a television receiver capable of displaying two types of broadcast contents as two screens (multi-screen) as an example of a display control device capable of multi-screen display. Will be explained. However, the present invention can be applied to any device capable of displaying two or more video contents of a plurality of systems on a single display device. Further, in this specification, “multiple video content” may be input as an independent signal for each system, or may be input as a single signal in which a plurality of video contents are multiplexed. . The video content may be stored video content recorded on a DVD or a video recorder, or broadcast content distributed in real time. Also, when the same video content is displayed in parallel on a plurality of screens, it is handled as a multi-screen display of a plurality of systems of video content.

  FIG. 1 is a block diagram illustrating a functional configuration example of a television receiver 100 according to an embodiment of the present invention. The television receiver 100 includes a broadcast receiving unit 10 having a function of synthesizing and outputting two types of broadcast content on one screen, and an image processing unit 20 that applies a high image quality process to the video output from the broadcast receiving unit 10. And have. The television receiver 100 further includes a display panel 30 that displays video content output from the image processing unit 20. Here, the broadcast receiving unit 10 may be a function of a broadcast receiving LSI generally provided in the television receiver 100, and the image processing unit 20 may be a function provided in the added high image quality LSI. In this case, the broadcast receiving unit 10 and the image processing unit 20 are included in separate semiconductor integrated circuits.

  The remote controller 2 is an example of input means for inputting an instruction from the user to the television receiver 100, and transmits information input by the user to the user input receiving unit 11. The user input receiving unit 11 receives, for example, various setting information of the television receiver 100 described later, which is input from the remote controller 2 by a user operation, and transmits it to the upstream control unit 13. Various setting information of the television receiver 100 includes, for example, a viewing channel setting, a screen display form setting, and the like, and is stored and managed in a nonvolatile memory 12 described later. The nonvolatile memory 12 stores and manages, for example, an operation program for each block of the television receiver 100, various setting information of the television receiver 100, and the like. Various setting information of the television receiver 100 includes, for example, the number of video contents displayed at the time of multi-screen display, display resolution information of each video content at the time of multi-screen display, in addition to viewing channel setting and screen display form setting, The image quality setting of the image quality enhancement processing unit is included. In the present embodiment, for the sake of convenience, each video content when displaying two screens (multi-screen) will be described with the main video content display area as the main screen and the sub video content display area as the sub screen.

  The upstream control unit 13 controls the operation of the broadcast receiving unit 10, and the downstream control unit 22 controls the operation of the image processing unit 20. In addition, the pre-stage control unit 13 and the post-stage control unit 22 can communicate with each other via the pre-stage communication unit 14 and the post-stage communication unit 21, and start multi-screen display processing, which will be described later, while communicating as necessary. The overall operation of the television receiver 100 is controlled. The front-stage control unit 13 and the rear-stage control unit 22 have, for example, a CPU, a ROM, and a RAM (not shown), and control each unit by executing a program stored in the ROM or the nonvolatile memory 12 using the RAM. Thus, the function of the television receiver 100 is realized.

  The first broadcast signal processing unit 15 and the second broadcast signal processing unit 16 respectively separate and decode broadcast contents corresponding to the viewing channel setting from the broadcast signal 1 in which a plurality of broadcast contents are multiplexed. For example, when receiving the viewing channel change request from the remote controller 2, the upstream control unit 13 updates the viewing channel setting of the nonvolatile memory 12, and transmits the updated viewing channel setting to the first broadcast signal processing unit 15 and the second broadcast signal processing unit 16. Separate / decode broadcast content of viewing channels. At this time, the broadcast content decoded by the first broadcast signal processing unit 15 is set as the main broadcast content, and the broadcast content decoded by the second broadcast signal processing unit 16 is set as the sub broadcast content. For example, when the display mode setting stored in the non-volatile memory 12 is a single screen display, it is not necessary to receive the sub-broadcast content, so the upstream control unit 13 uses the second broadcast signal processing unit 16 and the upstream resolution described later. The operation of the conversion unit 17 is stopped. Further, the first broadcast signal processing unit 15 and the second broadcast signal processing unit 16 respectively transmit the decoded broadcast content resolution information to the upstream control unit 13, and the upstream control unit 13 receives the resolution information of each broadcast content. Is stored in the nonvolatile memory 12.

  When the broadcast content separation / decoding from the broadcast signal 1 is completed, the main broadcast content decoded by the first broadcast signal processing unit 15 is sent to the synthesizing unit 18, and the sub-broadcast content decoded by the second broadcast signal processing unit 16 is sent to the previous stage. It is output to the resolution converter 17. The pre-stage resolution conversion unit 17 applies the resolution conversion process to the broadcast content decoded by the second broadcast signal processing unit 16 and outputs it to the synthesis unit 18. The upstream control unit 13 stores the resolution information of the sub broadcast content input to the upstream resolution conversion unit 17 and the resolution information of the sub broadcast content output from the upstream resolution conversion unit 17 stored in the nonvolatile memory 12. The pre-stage resolution conversion unit 17 is supplied to control the resolution conversion process. At this time, if the input / output resolutions of the sub-broadcast content input to the pre-stage resolution conversion unit 17 are the same, the pre-stage control unit 13 does not apply the resolution conversion processing in the pre-stage resolution conversion unit 17 and combines the sub-broadcast content. Control to output to 18.

  When the screen display form setting stored in the non-volatile memory 12 is a single screen display, the composition unit 18 is connected to the composition unit 18 without performing composition processing on the input video content. The data is output to the subsequent resolution conversion unit 23. In addition, when the screen display form setting stored in the nonvolatile memory 12 is a two-screen display (multi-screen display), the composition unit 18 synthesizes the input two video contents according to the screen display form setting, The resultant composite video content is output to the subsequent resolution conversion unit 23. When the composition processing is applied by the composition unit 18, the pre-stage control unit 13 determines the resolution of the composite video content after composition in accordance with the screen display form setting stored in the nonvolatile memory 12 and stores it in the nonvolatile memory 12. Further, the upstream control unit 13 determines a necessary frame buffer size based on the determined resolution information of the composite video content, and determines the downstream control unit 22 through the upstream communication unit 14 and the downstream communication unit 21. Tell the frame buffer size. The post-stage control unit 22 secures a frame buffer area in a VRAM (not shown) included in the post-stage resolution conversion unit 23 described later according to the frame buffer size information received from the pre-stage control unit 13. Specifically, a frame buffer area on the VRAM necessary for temporarily buffering one frame (or a plurality of frames) of composite video content output from the synthesizing unit 18 in the VRAM is secured. . In the case of single screen display, the upstream control unit 13 determines a necessary frame buffer size based on the resolution information of the main broadcast content. The upstream control unit 13 transmits the determined frame buffer size to the downstream control unit 22 and secures a frame buffer area in the VRAM in the downstream resolution conversion unit 23. The composition unit 18 outputs video content (main broadcast content or composite video content) to a frame buffer area secured in the VRAM of the subsequent resolution conversion unit 23.

  The television receiver 100 of the present embodiment will explain two types of screen display modes that are typical as screen display modes of two-screen display. One is picture-and-picture display (PandP) in which the display areas of the two systems of video content are displayed in parallel on the display area of the display panel 30 without overlapping. The other is picture-in-picture display (PinP) in which the display area of one video content is overlapped with the display area of the other video content. In addition, although this embodiment demonstrates the screen display form of 2 types of typical 2 screen displays, this invention is applicable to the display control apparatus which synthesize | combines the video content of several systems, and displays on a multiscreen.

  The post-resolution conversion unit 23 applies a resolution conversion process to the video content input from the synthesizing unit 18 into the VRAM included in the post-resolution conversion unit 23 and outputs the video content to the image quality improvement processing unit 24. At this time, the upstream control unit 13 sends the resolution information of the video content output from the combining unit 18 stored in the nonvolatile memory 12 to the downstream communication unit 21 via the upstream communication unit 14 and the downstream communication unit 21, and the display panel. It conveys information on 30 display resolutions. The information on the resolution of the video content output by the combining unit 18 is that the screen display mode setting of the resolution of the main broadcast content is 2 screens when the screen display mode setting stored in the nonvolatile memory 12 is a single screen display. In the case of display, it becomes information on the resolution of the composite video content. The rear communication unit 21 receives the resolution of the video content output from the synthesis unit 18 to the rear resolution conversion unit 23 transmitted from the front communication unit 14 and the resolution of the display area of the display panel 30 as the final output resolution. Supply and perform resolution conversion processing.

  Note that the latter-stage resolution conversion unit 23 has higher performance than the previous-stage resolution conversion unit 17 and can obtain a high-quality resolution conversion result. The resolution conversion process applied in the subsequent-stage resolution conversion unit 23 is superior to the previous-stage resolution conversion unit 17 in, for example, an algorithm for generating an interpolation pixel. Specifically, the subsequent resolution conversion unit 23 detects a diagonal line and its angle when the video content is enlarged, and generates an interpolation pixel with a filter coefficient suitable for the angle of the diagonal line. On the other hand, the pre-stage resolution conversion unit 17 does not generate an interpolation pixel in consideration of the angle of such a diagonal line. As a result, it is possible to obtain an output result in which the diagonal line when the video content is enlarged is smoother in the resolution conversion process performed by the subsequent-stage resolution conversion unit 23 than in the resolution conversion process performed by the previous-stage resolution conversion unit 17.

  The high image quality processing unit 24 applies the high image quality processing to the video content output from the subsequent resolution conversion unit 23 and outputs the high quality video content. The image quality enhancement process may be any process that improves the image quality of the input video content. For example, noise reduction, color enhancer, color correction, or the like may be performed. Here, in order to facilitate explanation and understanding, it is assumed that there is no change in the input / output resolution of the image quality enhancement processing unit 24. When the resolution conversion is accompanied in the image quality improvement processing, the pre-stage control unit 13 determines and supplies a resolution setting value considering the resolution conversion in the image quality improvement processing. The determined resolution setting value is supplied to the former-stage resolution converter 17 or the latter-stage resolution converter 23, respectively. The high image quality video content output from the high image quality processing unit 24 is output to the display panel 30.

(Display control processing: PinP display mode)
The display control process in the PinP display mode among the two-screen display modes of the television receiver of the present embodiment having such a configuration will be further described with reference to the flowcharts of FIGS.

  When the viewing channel setting and the screen display mode setting are changed to the two-screen display PinP display mode in response to an input from the user to the remote controller 2, the pre-stage control unit 13 sets the first broadcast signal processing unit 15 and the second broadcast signal. The processing unit 16 is made to perform the separation / decoding processing of the broadcast signal 1. The upstream control unit 13 decodes the main broadcast content decoded by the first broadcast signal processing unit 15 from the first broadcast signal processing unit 15 by the second broadcast signal processing unit 16 from the second broadcast signal processing unit 16. Information on the resolution of the sub broadcast content is acquired (S301).

  In S <b> 302, the pre-stage control unit 13 displays information on the resolution (main resolution) of the main screen and the sub-screen when it is finally displayed on the display area of the display panel 30 in the PinP display mode from the nonvolatile memory 12. Information of the display area (sub-resolution). The pre-stage control unit 13 calculates the ratio of the sub resolution to the main resolution in both the vertical component and the horizontal component from the acquired main resolution and sub resolution information (S303). In the PinP display mode of this embodiment, for example, as shown in FIG. 2D, the final main resolution is 1920 × 1080 pixels and the sub-resolution is 480 × 270 pixels, so the ratio of the horizontal components is 480/1920. = 1/4 and the ratio of the vertical components is 270/1080 = 1/4.

  In step S304, the upstream control unit 13 applies resolution conversion processing to the sub broadcast content in the upstream resolution conversion unit 17. At this time, the upstream control unit 13 supplies the resolution information of the sub broadcast content to the upstream resolution conversion unit 17 and the resolution information of the sub broadcast content after the resolution conversion processing is applied by the upstream resolution conversion unit 17. , Perform resolution conversion processing. The resolution of the sub broadcast content after applying the resolution conversion process is obtained by adding the ratio obtained in S303 to the resolution of the main broadcast content. For example, it is assumed that the resolution of the main broadcast content is 720 × 480 pixels and the resolution of the sub broadcast content is 1920 × 1080 pixels, as shown in FIG. 2A. When the ratio between the main resolution and the sub resolution obtained in S303 is the vertical component 1/4 and the horizontal component 1/4, the resolution of the sub broadcast content after the resolution conversion processing is applied by the pre-stage resolution conversion unit 17 is as follows. become that way. The resolution of the sub-broadcast content after applying the resolution conversion processing is 720 × 1/4 = 180 pixels by adding the horizontal component ratio obtained in S303 to the horizontal component resolution of the main broadcast content. . Similarly, the vertical component resolution is 480 × 1/4 = 120 pixels by adding the vertical component ratio obtained in S303 to the vertical component resolution of the main broadcast content (FIG. 2B). For this reason, when the application of the resolution conversion process in the pre-stage resolution conversion unit 17 is completed, the ratio of the resolution of the main broadcast content and the sub broadcast content becomes equal to the ratio of the main resolution and the sub resolution that is the final output. ing.

  In S304, depending on the resolution of the main broadcast content and sub-broadcast content and the main output and sub-resolution as final outputs, the sub-broadcast content after resolution conversion is applied when the resolution conversion processing is applied in the previous resolution conversion unit 17. In some cases, the resolution of the image does not become an integer value. In that case, although the ratio of the main resolution and the sub resolution, which is the final output, is strictly different, for example, the resolution of the sub broadcast content after resolution conversion may be rounded down to an integer value. Alternatively, the aspect ratio may be changed by adjusting the ratio of either the vertical or horizontal component so that the resolution of the sub-broadcast content after the resolution conversion becomes an integer value.

  In step S <b> 305, the upstream control unit 13 determines the resolution of the composite video content to be output by applying the synthesis process to the main broadcast content and the sub broadcast content in the synthesis unit 18. Further, the pre-stage control unit 13 determines the frame buffer size necessary for temporarily buffering the composite video content in the VRAM of the post-resolution conversion unit 23 based on the determined resolution information of the composite video content. To do. In the PinP display mode in the present embodiment, the display area of the sub screen is displayed so as to overlap with the display area of the main screen, so the resolution of the composite video content matches the resolution of the main broadcast content. For example, as shown in FIG. 2C, when the resolution of the main broadcast content is 720 × 480 pixels, the resolution of the composite video content is also 720 × 480 pixels. For this reason, the frame buffer size necessary for temporarily buffering the composite video content in the VRAM of the post-resolution conversion unit 23 may be 720 × 480 pixels. The upstream control unit 13 transmits the determined frame buffer size to the downstream control unit 22 via the upstream communication unit 14 and the downstream communication unit 21. The post-stage controller 22 secures a frame buffer area in the VRAM of the post-stage resolution converter 23 based on the frame buffer size information transmitted from the pre-stage controller 13.

  In step S306, the upstream control unit 13 applies composition processing to the main broadcast content in the composition unit 18 and the sub broadcast content whose resolution is converted in step S304 so that the screen layout of the main screen and the sub screen in the PinP display format is obtained. To output composite video content. The output composite video content is transferred to a frame buffer area secured in the VRAM of the subsequent resolution conversion unit 23. Further, the upstream control unit 13 stores the resolution information of the composite video content in the nonvolatile memory 12 and simultaneously transmits the information to the downstream control unit 22 via the upstream communication unit 14 and the downstream communication unit 21. The pre-stage control unit 13 further reads out resolution information of the display area of the display panel 30 from the nonvolatile memory 12 and transmits the information to the post-stage control unit 22 via the pre-stage communication unit 14 and the post-stage communication unit 21.

  In step S <b> 307, the post-stage control unit 22 applies resolution conversion processing to the composite video content output from the synthesis unit 18 in the post-stage resolution conversion unit 23. At this time, the post-stage controller 22 supplies the post-stage resolution converter 23 with the resolution information of the composite video content transmitted from the pre-stage controller 13 and the resolution of the display area of the display panel 30 to the post-stage resolution converter 23. , Perform resolution conversion processing. For example, as shown in FIG. 2C, when the resolution of the composite video content is 720 × 480 pixels, the subsequent resolution conversion unit 23 sets the horizontal component resolution to 1920/720 = 8/3 times, and the vertical component resolution. Is converted to 1080/480 = 9/4 times resolution. By this resolution conversion, the resolution of the display area of the main broadcast content matches the main resolution, and the display area of the sub broadcast content also has a horizontal component resolution of 180 × 8/3 = 480 pixels and a vertical component resolution of 120 × 9 / 4 = 270 pixels, which matches the sub resolution.

  In the present embodiment, the case where the resolution of the display area of the main screen in the PinP display mode matches the resolution of the display area of the display panel 30 has been described. However, the resolution of the display area of the main screen is If it is smaller than the resolution of the display area, it may be as follows. For example, consider a case where the resolution of the horizontal component of the display area of the main screen matches the resolution of the display area of the display panel 30 but the resolution of the vertical component is smaller than the resolution of the display area of the display panel 30. In this case, the post-stage control unit 22 adds a band-shaped black area having no information above or below the display area of the main screen, or both in the post-stage resolution conversion section 23, and displays the resolution of the obtained video content on the display panel 30. It is sufficient to match the resolution of the display area.

  In step S <b> 308, the post-stage control unit 22 applies the image quality enhancement process to the video content output from the post-stage resolution conversion unit 23 and outputs the image quality enhanced video content. The rear control unit 22 outputs the output high-quality video content to the display panel 30.

(Display control processing: PandP display mode)
Further, display control processing in the PandP display mode in the two-screen display mode of the television receiver of this embodiment will be described with reference to the flowchart of FIG. 3 and FIG. In the description of the PandP display mode, the description of the steps for performing the same operation as the display control process in the PinP display mode is omitted, and only the characteristic steps in the PandP display mode are described.

  In step S303, the upstream control unit 13 calculates the ratio of the sub resolution to the main resolution in both the vertical component and the horizontal component from the acquired main resolution and sub resolution information. In the PandP display mode of this embodiment, for example, as shown in FIG. 4D, the final main resolution and sub resolution are both 960 × 540 pixels, so the ratio between the vertical component and the horizontal component is 1. . In the PandP display mode of the present embodiment, a case where the main resolution and the sub resolution are equal will be described. However, the PandP display only needs to be displayed in parallel without overlapping the display areas of the video content to be configured. Therefore, the main resolution and the sub resolution are not necessarily equal.

  In step S304, the upstream control unit 13 applies resolution conversion processing to the sub broadcast content in the upstream resolution conversion unit 17. At this time, the information on the resolution of the sub broadcast content supplied by the pre-stage control unit 13 and the resolution of the sub-broadcast content after applying the resolution conversion process in the pre-stage resolution conversion unit 17 are the ratios obtained in step S303 and the main broadcast content. It is calculated by adding up to the resolution. For example, as shown in FIG. 4D, when the final output resolutions of the main broadcast content and the sub broadcast content are equal in the PandP display mode, the resolution of the sub broadcast content is set to the resolution of the main broadcast content by the previous resolution conversion unit 17. The resolution is converted so that As shown in FIG. 4A, when the resolution of the main broadcast content is 1920 × 1080 pixels and the resolution of the sub broadcast content is 720 × 480 pixels, the aspect ratio of the main broadcast content and the sub broadcast content is different. For example, the resolution conversion unit 17 performs the following processing. When the resolution conversion is performed with priority given to the resolution of the horizontal component of the sub-broadcast content, the resolution of the sub-broadcast content after conversion is 1920 × 1280 pixels. Therefore, for example, by cropping the upper and lower pixels to 1920 × 1080 pixels. Good. In addition, when the resolution conversion is performed by giving priority to the resolution of the vertical component of the sub-broadcast content, the resolution of the sub-broadcast content after conversion is 1620 × 1080 pixels, so for example, a black band area is added to the left and right Thus, it may be set to 1920 × 1080 pixels.

  In step S <b> 305, the upstream control unit 13 determines the resolution of the composite video content output by the composition unit 18. In addition, the upstream control unit 13 determines a frame buffer size necessary for temporarily buffering the composite video content in the VRAM of the post-resolution conversion unit 23 based on the determined resolution information of the composite video content. . In the PandP display mode in the present embodiment, the display areas of the main screen and the sub screen are the same and are displayed adjacent to each other in the horizontal direction, so the resolution of the composite video content matches twice the resolution of the main broadcast content. . That is, the resolution of the composite video content in the present embodiment is a resolution obtained by multiplying the horizontal component resolution of the main broadcast content by the number of video content lines displayed in the PandP display mode. For example, as shown in FIG. 4C, when the main broadcast content is 1920 × 1080 pixels, the resolution of the composite video content is 3840 × 1080 pixels. For this reason, the frame buffer size necessary for temporarily buffering the composite video content in the VRAM of the post-resolution conversion unit 23 may be 3840 × 1080 pixels. The upstream control unit 13 transmits the determined frame buffer size to the downstream control unit 22 via the upstream communication unit 14 and the downstream communication unit 21. The post-stage controller 22 secures a frame buffer area in the VRAM of the post-stage resolution converter 23 based on the frame buffer size information transmitted from the pre-stage controller 13.

  Note that, in the present embodiment, processing in two-screen display of two types of broadcast content has been described, but it is possible to deal with the case where three or more types of video content are input. In this case, the pre-stage resolution conversion unit 17 may be provided for the number of sub-systems of video content, and the synthesizing unit 18 may combine a plurality of systems of video content into one system of composite video content.

  In this embodiment, an example is described in which the broadcast receiving unit 10 is implemented by a broadcast receiving LSI and the image processing unit 20 is implemented by an image quality improving LSI. However, what kind of hardware or software implements the functional blocks of the broadcast receiving unit 10 and the image processing unit 20 is arbitrary. For example, the broadcast receiving unit 10 and the image processing unit 20 may be included in one integrated circuit package, or at least some of the functional blocks may be realized by software.

  The display control apparatus according to the present embodiment includes a front-stage resolution conversion unit capable of independently converting the resolution of sub-video content among a plurality of types of video content, and a single-system video content having higher image quality than the previous-stage resolution conversion unit. A post-resolution conversion unit capable of converting the resolution is included. In addition, there is a synthesizing unit capable of synthesizing a plurality of video contents into one system between the previous resolution conversion unit and the subsequent resolution conversion unit, and an image quality improvement processing unit for improving the image quality of the output of the subsequent resolution conversion unit, Have In such a display control apparatus, resolution conversion is not performed on the main video content by the previous resolution conversion unit, but is performed by the subsequent resolution conversion unit. In addition, when multi-screen video content is displayed on multiple screens, the resolution of the video content that is sub-level in the previous resolution conversion unit according to the ratio of the main video content and sub-video content in the final output resolution. Perform conversion. Specifically, in a display form in which one system of video content is displayed without combining, resolution conversion processing is performed by the subsequent resolution conversion unit without performing resolution conversion by the previous resolution conversion unit. As a result, high-quality image conversion processing can be performed on the high-quality resolution conversion result, so that high-quality video content can be displayed by fully utilizing the effect of high-quality image processing. Further, in a display form in which video contents of a plurality of systems are displayed on a multi-screen, the main video content is not subjected to resolution conversion in the previous resolution conversion unit. In accordance with the ratio of the display area of the main video content and the sub video content at the time of final multi-screen display, resolution conversion processing is performed on the sub video content in the previous resolution conversion unit. Furthermore, the main video content and the sub video content whose resolution is converted by the previous resolution conversion unit are combined by the combining unit, the resolution conversion is performed by the subsequent resolution conversion unit, and then the image quality enhancement process is applied. As a result, even when video contents of a plurality of systems are displayed on a multi-screen, each video content can enjoy the effect of high image quality processing.

Claims (6)

Of the plurality of input video contents, the former resolution conversion means for converting the resolution of the sub video content and outputting it,
Of the plurality of input video contents, one system is composed by synthesizing the main video content of one system and the sub video content output from the previous resolution conversion means into a multi-screen display form. Synthesis means for outputting as a composite video content of
Subsequent resolution converting means connected to the synthesizing means and for converting the resolution of the video content output from the synthesizing means and outputting it,
Control means for controlling the operation of the preceding-stage resolution conversion means, the subsequent-stage resolution conversion means, and the combining means,
The control means performs resolution conversion of the sub video content by the pre-stage resolution conversion means in accordance with a ratio of the main video content and the sub video content when the multi-screen display is performed. A display control device. A decision means for deciding the resolution of the synthesized video content output from the synthesis means;
The display control apparatus according to claim 1, wherein the determination unit determines the resolution of the composite video content according to the form of the multi-screen display and the resolution of the main video content. The determining means includes
In the case of multi-screen display in the form of picture-in-picture display of the input plurality of video content, the resolution of the composite video content is the same as the resolution of the main video content,
When the input video content of multiple systems is displayed in a multi-screen display mode of picture and picture display, the resolution of the composite video content is multiplied by the resolution of the main video content by the number of video content systems. The display control device according to claim 2, wherein the display control device has a resolution.   The control means, when the resolution of the sub video content does not become an integer value when the resolution conversion is performed by the preceding resolution conversion means, the resolution of the video content is rounded down to an integer value. The display control apparatus according to any one of 1 to 3.   5. The display control apparatus according to claim 1, wherein the front-stage resolution conversion unit and the rear-stage resolution conversion unit are included in different integrated circuits. 6. Of the plurality of input video contents, the former resolution conversion means for converting the resolution of the sub video content and outputting it,
Of the plurality of input video contents, one system is composed by synthesizing the main video content of one system and the sub video content output from the previous resolution conversion means into a multi-screen display form. Synthesis means for outputting as a composite video content of
A control method for a display control apparatus, comprising: a latter-stage resolution conversion unit that is connected to the synthesis unit and converts the resolution of the video content output from the synthesis unit and outputs the converted video content;
A control step of controlling operations of the front-stage resolution conversion unit, the rear-stage resolution conversion unit, and the synthesis unit;
In the control step, the resolution conversion of the sub video content is performed by the pre-stage resolution conversion unit in accordance with the ratio of the main video content and the sub video content when multi-screen display is performed. A control method for a display control device.

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