JP2013213859A - Video system and video processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology to suppress an increase in the number of GDCs and ASICs included in a video processing path, and distribute video information for every display at an optimal display frame rate, even when video display is performed on a plurality of displays.SOLUTION: A video system includes: a video creation device that outputs video in a frame sequence at a predetermined frame transmission rate; an output control device that receives the video from the video creation device in a frame sequence at said frame transmission rate, and outputs the video to a display device; and a plurality of display devices. The video creation device outputs a frame sequence of a composite video obtained by combining frame sequences of a plurality of videos output respectively from a plurality of the display devices; and the output control device extracts frame sequences of individual videos output from the frame sequence of the composite video to the respective display devices.

Description

  The present invention relates to a technique of a video processing method for a display mounted on a vehicle.

  In recent years, the number of displays mounted on a vehicle is the content provided (for example, navigation, television (TV) broadcast, playback images such as DVD (Digital Versatile Disk) and BD (Blu-ray Disc)), and camera-captured images. , Drawing images showing vehicle conditions, games, etc.) tend to increase with diversification.

  Conventionally, provided content has been displayed on each display via a video processing path 90 provided for each display, for example, as shown in FIG. In the form of the video display processing of FIG. 1, a video processing path 90 for displaying and displaying a display image with a screen resolution of 640 × 480 pixels on a 7-inch main display 93 and a 640 × 350 on a 4.3-inch sub-display 94. Two video processing paths are provided, including a video processing path 90 that displays and outputs a display image at the pixel screen resolution.

For example, the video information 93a supplied from the navigation is GDC (Graphics Display).
The video display processing is performed through one video processing path 90 including a dedicated LSI (Large Scale Integration) for video display processing such as a controller 91 and an application specific integrated circuit (ASIC) 92. The video information 93a subjected to the video display processing is displayed and output on a main display 93 provided in the center console, for example. Similarly, video information 94a such as a drawing image indicating an operating state of an air conditioner or the like is subjected to video display processing via a video processing path 90 including the other GDC 91 and ASIC 92, for example, 4 provided in a meter hood. Displayed on the 3-inch display 94.

  The video information 93 a displayed and output on the main display 93 is output from the video processing path 90 at a frame rate period (display frame rate) for updating the display screen of the main display 93. Similarly, the video information 94a displayed and output on the sub display 94 is also output from the video processing path 90 at a frame rate period (display frame rate) for updating the display screen of the sub display 94.

  The following Patent Documents 1 to 3 exist as documents describing techniques related to the technique described in this specification.

JP-A-4-297222 JP 2007-249753 A Japanese Patent Laid-Open No. 2004-258871

As shown in FIG. 1, the conventional video display processing mode requires video processing paths including GDCs and ASICs as many as the number of displays for displaying video. However, since the GDC included in the video processing path is not inexpensive, it has been a problem to increase the cost of the entire system if an attempt is made to cope with an increase in video content to be provided. In addition, when a plurality of video processing paths are provided, there is a risk of increasing the size of a substrate on which a dedicated IC such as a GDC or ASIC is mounted.

  In addition, when a video processing path is to be shared by a plurality of displays, the video processing path has to consider a display frame rate that is different for each display for outputting video information. In other words, the video processing path requires an arbitration circuit capable of arbitrating the display frame rate between a plurality of ASICs for displaying video information on each display.

  The problem of the disclosed technology is to suppress the increase in the number of GDC and ASIC included in the video processing path even when video is displayed on a plurality of displays, and to distribute the video information at an optimal display frame rate for each display. It is to provide.

  One aspect of the disclosed technology is exemplified by the following video system configuration. That is, a video system includes a video generation device that outputs video at a frame sequence of a predetermined frame transmission rate, and an output control device that receives video from the video generation device at a frame sequence of frame transmission rate and outputs the video to a display device And a plurality of display devices, wherein the video generation device outputs a composite video frame sequence obtained by combining a plurality of video frame sequences output to the plurality of display devices, and the output control device outputs the composite video The frame sequence of the individual video output to each display device is extracted from each frame sequence.

  According to such a configuration, the video generation device outputs a frame sequence of a composite video obtained by combining a plurality of video frame sequences output to a plurality of display devices at a predetermined frame transmission rate, and the output control device The frame sequence of the individual video output to each display device can be extracted from the frame sequence of the composite video output at a predetermined frame transmission rate. As a result, even when video is displayed on a plurality of display devices, a video processing path can be configured without increasing the number of GDCs and ASICs. Extraction of the frame sequence of the individual video output to each display device is performed in parallel, and can be output at an optimal frame rate for each display device.

  According to this video system, even when video is displayed on multiple displays, the technology to suppress the increase in the number of GDC and ASIC included in the video processing path and distribute video information at the optimal frame rate for each display is provided. it can.

It is a figure explaining the structure of the conventional video processing path | route. It is a schematic block diagram of the video system of this embodiment. It is a figure which shows the example which displays and outputs video data on two sub displays provided in the instrument panel in front of a driver's seat. It is a flowchart which illustrates the video display process of the video system of this embodiment. It is a figure explaining the display output of the video data by the conventional video processing path. It is a timing chart which illustrates the data output between GDC / ASIC of this embodiment. It is an illustration of the schematic block diagram of ASIC. It is a timing chart which illustrates the data output between GDC / ASIC of this embodiment. 10 is a flowchart illustrating an image display process according to the second embodiment. 6 is a timing chart illustrating a video display process according to the second embodiment. 6 is a timing chart illustrating a video display process according to the second embodiment. It is a figure explaining the video display process of Example 3. FIG. 12 is a flowchart illustrating an image display process according to the third embodiment. 12 is a timing chart illustrating a video display process according to the third embodiment. It is a figure which illustrates the AVN machine provided with the video system of this embodiment.

  Hereinafter, a video system according to an embodiment will be described with reference to the drawings. The configuration of the following embodiment is an exemplification, and the video system is not limited to the configuration of the embodiment.

  Hereinafter, the video system will be described with reference to FIGS. 2 to 15.

〔Device configuration〕
FIG. 2 is a schematic configuration diagram of the video system of the present embodiment. The video system 10 illustrated in FIG. 2 constitutes a part of an information processing system such as an in-vehicle audio / visual / navigation integrated machine (AVN machine) described later. The video system 10 in FIG. 2 shows, for example, navigation from an AVN machine, television (TV) broadcast, playback images such as DVD (Digital Versatile Disk) and BD (Blu-ray Disc), camera-captured images, and vehicle status. Various contents that can be displayed on an AVN machine such as a drawing image and a game are supplied.

  The video system 10 performs a drawing process corresponding to the display (display device) on which the video content is displayed for each of the various contents described above, and has, for example, red (R) and green (G) having 8-bit gradation information. , Blue (B) image data composed of pixels of color elements is generated. Then, the video system 10 performs display processing such as color correction by linear correction and color tone correction such as gamma correction on the generated video data. The video data after the display processing is displayed on the display at a predetermined screen resolution at an optimal display frame rate for each display.

  In the video system 10 illustrated in FIG. 2, two types of content are supplied: video content displayed and output on the 7-inch size main display 13 and video content displayed and output on the 4.3-inch size sub-display 14. . The main display 13 is disposed, for example, in a portion that separates the driver's seat such as the center console and the passenger seat on the side of the steering, and the sub display 14 is disposed, for example, on an instrument panel in front of the driver's seat. The main display 13 has a screen resolution of 640 × 480 pixels such as VGA (Video Graphics Array), and the sub-display 14 has a screen resolution of 640 × 350 pixels such as EGA (Enhanced Graphics Adapter).

The video system 10 executes the above-described drawing processing and display processing for each display in parallel on the supplied two-line video content. The two systems of video data processed by the video system 10 are output in parallel at the optimal display frame rate for each display, as will be described later. As a result, the video system 10 uses, for example, video content such as navigation, television (TV) broadcasting, playback images such as DVD (Digital Versatile Disk) and BD (Blu-ray Disc), 640 such as VGA (Video Graphics Array). It can be displayed on a 7-inch main display 13 with a screen resolution of × 480 pixels. In parallel with the video display processing on the main display 13, for example, video content such as a camera-captured image and a drawing image indicating a vehicle state is displayed at a screen resolution of 640 × 350 pixels such as EGA (Enhanced Graphics Adapter). It can be displayed on the 3-inch size sub-display 14.

The video system 10 of this embodiment includes a GDC (Graphics Display Controller) 11, A
An SIC (Application Specific Integrated Circuit) 12 is provided. The GDC 11 and the ASIC 12 constitute a video processing path common to a plurality of displays. Since the video processing display device 10 has a common video processing path for a plurality of displays, the video processing display device 10 can perform a video display process on a plurality of supplied video contents in parallel at a screen resolution corresponding to each display. The GDC 11 is an example of a video generation device, and the ASIC 12 is an example of an output control device.

The GDC 11 is an LSI (Large Scale Integration) for video display processing having a plurality of processors that execute graphic display programs such as 2DEngine and 3DEngine, a CPU (Central Processing Unit) that performs various arithmetic processing, a memory, various interfaces, and the like.
). The various interfaces may include communication interfaces such as ADC (Analog / digital converter), CAN (Controller Area Network), LIN (Local Interconnect Network), and Ethernet (registered trademark) in addition to the input / output interface.
The memory of the GDC 11 is a storage medium in which each processor of the GDC 11 caches various programs and data and develops a work area. For example, a RAM (Random Access Memory), a ROM (Read Only Memory), and an EPROM (Erasable Programmable). ROM) etc. For example, the GDC 11 develops various programs and various data stored in a ROM or the like in an executable manner in a RAM or the like, and each processor or the like executes the various programs, thereby drawing according to a display on which video content is displayed. Processing is performed to realize a function that meets a predetermined purpose such as generation of video data.

The ASIC 12 is a custom IC for video display processing that performs display processing such as color correction by linear correction or color tone correction such as gamma correction on input video data. The ASIC 12 includes a logic circuit such as an AND circuit, an OR circuit, a NOT circuit, and a counter circuit, a signal processing circuit such as addition and multiplication, a memory, a PLL (Phase-locked loop), an input / output interface, and the like. The memory of the ASIC 12 is a storage medium that stores video data input via an input / output interface, a table to be referred to during signal processing, and the like. For example, a RAM (Random Access Memory), a ROM (Read Only Memory), Includes EPROM (Erasable Programmable ROM).

〔Outline of processing〕
The GDC 11 in FIG. 2 generates video data to be displayed and output on the main display 13 and the sub display 14 based on the supplied two video contents. The GDC 11 of the present embodiment generates one composite video image including the video data 11 a of the main display 13 and the video data 11 b of the sub display 14 and outputs it to the ASIC 12. Here, in the present embodiment, video data including a plurality of video data is referred to as “composite video image”, and generation of the composite video image is referred to as “synthesis”. Examples of methods of “compositing” a plurality of video data include a method of generating one composite video image in three forms: (1) frame by frame, (2) using a blanking period, and (3) speeding up a drawing clock. it can. In the cases (1) and (2), video data of a plurality of surfaces are individually drawn and generated, and output to the ASIC 12 with a common transmission frame.

  Here, the video data 11a of the main display 13 is configured with, for example, 640 × 480 pixels, and the video data 11b of the sub display 14 is configured with, for example, 640 × 350 pixels. Assume that each pixel is represented by quantized R, G, B 8-bit gradation information. In the following description, video data generated by the drawing process is referred to as “original image”.

In the case of the above (1), for example, the GDC 11 draws and generates one video data 11c including the video data 11a and the video data 11b, and outputs the video data 11c to the ASIC 12 with a transmission frame of the same period. The video data 11c drawn and generated by the GDC 11 includes video data 11a and 640 × 35 composed of at least 640 × 480 pixels.
Any pixel size including the video data 11b composed of 0 pixels may be used. In the illustrated example, the video data 11c may have a pixel size of at least 640 × (480 + 350) pixels since the video data 11a and the video data 11b are arranged vertically in the vertical direction (vertical direction). Such drawing / generation of the video data 11c is performed by synthesizing the original image of the video data 11a and the original image of the video data 11b, which are drawn individually, while maintaining the pixel size of each original image. The video data 11c of the video image may be generated.

  In the case (2), the GDC 11 renders and generates one video data 11c including the video data 11a and the video data 11b, for example. Then, for example, the GDC 11 outputs the image frame of the video data 11a to the ASIC 12 within the effective range of the display area corresponding to the video data 11a, and compresses the video data 11b within a blanking period or straddles a plurality of frames. The data size is divided so that transmission is possible and output to the ASIC 12. That is, the composite video image transferred between the GDC / ASIC forms a transmission frame having the same period in the effective range period + the blanking period.

  In the illustrated example, since the video data 11a and the video data 11b are arranged vertically in the vertical direction (vertical direction), the video data 11c has the video data 11a having a size of 640 × 480 pixels within the effective range of the display area of the main display 13. To output to the ASIC 12. The video data 11b having a size of 640 × 350 pixels is output to the ASIC 12 within the blanking period of the main display 13. In general, when the effective range period and the blanking period are compared, the blanking period is short, so that the video data 11b can be output within the blanking period and can be transmitted over a predetermined compression or multiple frames. Divide the data size as follows.

  As will be described later, the ASIC 12 performs a decompression process on the video data 11b compressed within the blanking period based on, for example, the compression rate of the video information notified from the GDC 11, and the video data 11b having a data size before compression. Restore to. Further, as will be described later, the ASIC 12 combines the video data divided over a plurality of frames based on, for example, frame position information before division of the video information notified from the GDC 11, and the data size before division. The video data 11b is restored.

  In the case (3), for example, the GDC 11 draws and generates one video data 11c including the video data 11a and the video data 11b with a processing clock having a high clock rate (clock frequency). Then, one composite video image with an increased drawing density is output to the ASIC 12 within the effective range of the display area of the display. A detailed description of this case will be described later.

  In the above form, the GDC 11 outputs one video data 11c including the video data 11a and the video data 11b to the ASIC 12 via the input / output interface.

  The video system 10 of the present embodiment processes the video data displayed and output on the main display 13 and the sub display 14 in parallel by causing the GDC 11 to execute a processing function for drawing and generating such a composite video image. can do. However, the processing function executed by the GDC 11 for drawing and generating a composite video image is not limited to the processing example of FIG. For example, the video data 11c may be a composite video image in which the video data 11a and the video data 11b are arranged in parallel in the horizontal direction (horizontal direction). In this case, the video data 11c that is a composite video image can have a pixel size of at least (640 + 640) × (480) pixels or more. The pixel size of one composite video image including a plurality of video data can be selected appropriately depending on the display accuracy required by the in-vehicle system, the scale of the in-vehicle system, the effective display area of the display that displays and outputs the video data, and the like. .

  The composite video image output from the GDC 11 is input to the ASIC 12 via the input / output interface included in the ASIC 12. As will be described later, the ASIC 12 separates the input composite video image into video data for each display at a predetermined timing, and temporarily stores the separated video data in a memory. For example, the ASIC 12 reads each video data stored in the memory at the display timing of each display, and performs display processing such as color correction such as color correction and gamma correction. Each video data subjected to display processing by the ASIC 12 is output in parallel to each display at a display frame rate for each display. Since the video data stored in the memory is read and the display frame rate for outputting the video data to the corresponding display is processed based on the clock signal with the same period, the optimal display frame rate for each display Can distribute and output each video data.

  In the case (1), the video data 11c is output to the main display 13 and the sub display 14 by distinguishing and classifying the frames of the video data 11c into frames belonging to the video data 11a and frames belonging to the video data 11b. Can be distinguished from the video data to be recorded.

  In the case (2), the frame of the video data 11c is output in the effective period + the blanking period. For example, when data is transferred between the GDC / ASIC, a frame belonging to the video data 11a is output within the effective period, and a frame belonging to the video data 11b is output within the blanking period. Can be distinguished and classified. As a result, the video data output to the main display 13 and the video data output to the sub display 14 can be distinguished.

  In the case (3), the ASIC 12 divides the image frame of the video data 11c, which is a composite video image, into an image frame area of the video data 11a and an image frame area of the video data 11b. For example, when the video data 11c that is a composite video image is such that the video data 11a and the video data 11b are arranged vertically in the vertical direction (vertical direction), the image frame of the composite video image is divided at a timing synchronized with the vertical synchronization signal. Thus, the video data for each display included in the composite video image can be separated. Note that the ASIC 12 may separate each video data included in the composite video image based on a timing signal notified from the GDC 11, pixel information of the composite video image, and the like.

  The video data 11a and the video data 11b separated by the ASIC 12 are displayed and output in parallel at an optimum display frame rate on a display corresponding to each. For example, the 640 × 480 pixel image 12 a is displayed and output on the main display 13 as video data 11 a of video content such as navigation. Similarly, the image 12b of 640 × 350 pixels is displayed and output on the sub display 14 as video data 11b of video content such as a drawing image indicating the vehicle state. Note that the ASIC 12 may synchronize the output timing between the video data output to each display.

  The video system 10 according to the present embodiment causes the ASIC 12 to perform display processing such as division of a composite video image and color interpolation processing between pixels so that, for example, video data displayed on the main display 13 and a sub display are displayed. It is possible to synchronize and synchronize with the video data displayed and output at 14. Needless to say, the division, display processing, and the like of the composite video image performed by the ASIC 12 are not limited to the processing example of FIG. For example, in the synthesized video image in which the video data 11a and the video data 11b are arranged in parallel in the horizontal direction (horizontal direction), the pixel frame of the synthesized video image may be divided at a timing synchronized with the horizontal synchronization signal.

  FIG. 3 is an example in which video data is displayed and output on two sub-displays 14a provided on the instrument panel in front of the driver's seat. In the meter hood 15 of the instrument panel, two 4.3 inch sub-displays 14a are provided so as to sandwich the speedometer 16a and the rotational speedometer 16b. The video system 10 shown in FIG. 3 is supplied with video content that can be displayed and output on at least a 10.2-inch main display 13a and two 4.3-inch sub-displays 14a. In addition, the main display 13a is arrange | positioned in the part which separates the driver's seat and front passenger seat, such as a center console, on the side of a steering.

  The GDC 11 of the illustrated video system 10 includes a display output system for the main display 13 a and a system for outputting a composite video image to the ASIC 12. The GDC 11 draws and generates one composite video image 11f including video data 11d and 11e displayed and output on the two sub-displays 14a. The composite video image 11f is output to the ASIC 12, for example, as one video data having a pixel size including the video data 11d and the video data 11e in parallel in the horizontal direction.

The synthesized video image 11 f output from the GDC 11 is separated or divided into an image frame of the video data 11 a and an image frame of the video data 11 b by the ASIC 12, and temporarily stored in the memory of the ASIC 12. Each video data stored in the memory of the ASIC 12 is read at the display timing of each sub-display 14a, subjected to display processing, and VRAM (Video RAM) at the display frame rate of each sub-display 14a.
). Each video data output to the memory 17 is displayed on each display 14a. In the ASIC 12, display output processing to each sub-display 14a such as division processing and display processing can be executed in parallel with synchronization, so that video data on each sub-display 14a can be displayed in conjunction with each other.

  In the video system 10 of FIG. 3, for example, video data to be displayed and output from the GDC 11 to the main display 13 a may be supplied via the ASIC 12. For example, in the ASIC 12, a processing delay related to the display output of each sub-display 14a may be given to the video data displayed and output on the main display 13a, and the display output may be performed on the main display 13a. The video data displayed and output on the main display 13a via the ASIC 12 is displayed and output in synchronization with the video data displayed on each sub-display 14a by adding a processing delay based on the clock signal in the ASIC 12. it can. As a result, for example, video data displayed and output among three displays can be linked.

  Hereinafter, specific processing will be described with the case (1) described above as Example 1, the case (2) as Example 2, and the case (3) as Example 3.

<Example 1>
[Process flow]
Hereinafter, with reference to FIG. 4 to FIG. 8, the video display processing of the present embodiment ((1) by frame) will be described. FIG. 4 is an example of a flowchart of video display processing for each display such as video data rendering by the video system 10, synthesis of a plurality of video data, division of the synthesized video image, and display processing of the video data after division. The GDC 11 of the video system 10 executes, for example, video data drawing processing, synthesis of a plurality of video data, and the like by various programs that are executable in the memory. In FIG. 4, the process of S1-S2 is executed by the GDC 11, and the process of S3-S4 is executed by the ASIC 12.

In the flowchart of the video display process illustrated in FIG. 4, “display start” of the video display process can be presented, for example, when the vehicle ignition key is in the “ON” or “ACC” position and power supply is started.

  The GDC 11 of the video system 10 draws and generates video data according to the main display 13a and the two sub-displays 14a illustrated in FIG. 3 based on the provided video content. In the example of FIG. 3, the GDC 11 draws and generates one video data 11f including each video data from the video data 11d and the video data 11e of the two sub-displays 14a drawn and generated (S1). ). In the example of FIG. 3, for example, one video data 11f having a pixel size in which the video data 11d and the video data 11e are included in parallel in the horizontal direction is drawn as the synthesized video image.

  The video data 11d and 11e of each sub-display 14a is composed of, for example, 640 × 350 pixels, and each pixel is expressed by quantized R, G, B 8-bit gradation information. In the example of FIG. 3, the video data 11f, which is a composite video image, includes at least (640 + 640) × (350) pixels or more because the video data 11d and the video data 11e are arranged in parallel in the horizontal direction (horizontal direction). Any size is acceptable.

  Returning to FIG. 4, the GDC 11 of the video system 10 outputs the video data 11f, which is a composite video image, to the ASIC 12, and displays the video data of the main display 13a drawn and generated in parallel on the display. For example, the GDC 11 determines the output order of the video data 11d and the video data 11e, and outputs the determined output order of each video data to the ASIC 12 together with the composite video image (S2). In explaining the data output of the composite video image of the present embodiment to the ASIC 12, the data output between the GDC / ASIC in the conventional video processing path will be explained with reference to FIG.

  FIG. 5 is an explanatory view of display output of video data by the conventional video processing path 90. As described above with reference to FIG. 1, the conventional video processing path 90 includes the GDC 91 and the ASIC 92, respectively. The video processing path 90 of the display 1 in FIG. 5 is the video processing path of the main display 93 in FIG. 1, and the video processing path 90 of the display 2 corresponds to the video processing path of the sub display 94 in FIG.

  In FIG. 5, video data (video 1 and video 2) corresponding to video content is drawn and generated by each GDC 91 and output to the ASIC 92 at a predetermined transmission frame rate. Here, the conventional transmission frame rate is a frame rate of 60 fps (frames / second). For example, the video data drawn and generated by the GDC 91A is divided into 60 frames with the pixel size of the video data, and each frame is output to the ASIC 92A at a transmission frame rate of 60 fps. The video data of “video 1” input to the ASIC 92A is output from the ASIC 92A at a frame rate cycle in which display processing such as color correction is performed and the display screen of the main display 93 is updated. Similarly, the video data drawn and generated by the GDC 91B is divided into, for example, the frame size of the video data into 60 frames, and each frame is output to the ASIC 92B at a transmission frame rate of 60 fps. The video data of “Video 2” input to the ASIC 92B is subjected to display processing such as color correction and is output from the ASIC 92B at a frame rate cycle for updating the display screen of the sub-display 94.

  FIG. 6 illustrates a timing chart of data output between GDC / ASIC in the video system 10 of the present embodiment. FIGS. 6A and 6B are examples of time charts for outputting a composite video image to the ASIC 12 at a conventional transmission frame rate. 6A and 6B, “Display 1” and “Display 2” correspond to, for example, the two sub-displays 14a illustrated in FIG.

  In S2 of the flowchart illustrated in FIG. 4, the GDC 11 determines the output order of the video data for each display included in one video data 11f. In the example of FIG. 3, the GDC 11 draws / generates two pieces of video data 11d and 11e, includes them in one piece of video data 11f, and outputs them to the ASIC 12. For example, the GDC 11 determines to sequentially output the video data 11d in the odd-numbered frames output to the ASIC 12 and sequentially output the video data 11e in the even-numbered frames. Then, the GDC 11 outputs the video data 11f to the ASIC 12 at the same transmission frame rate as that of the conventional video processing path 90, and outputs the determined video information of each frame in parallel to the ASIC 12. Here, the video information of each frame output from the GDC 11 to the ASIC 12 may be output, for example, in the form of a video selection signal illustrated in FIG. 6, for example, embedded as additional data in a part of the video data 11f, for example, Notification may be made in accordance with the blanking timing preceding each video frame data. An appropriate form can be selected according to the display accuracy required for the in-vehicle system, the scale of the in-vehicle system, the transmission capacity and bandwidth, the effective display area of the display for displaying and outputting video data, and the like.

  FIG. 6A shows an example in which one piece of video data including video data 1 of the display 1 in odd frames and video data 2 of the display 2 in even frames is output to the ASIC 12. In FIG. 6A, two video data are drawn, and each video data is output alternately for each frame. Each frame is output to the ASIC 12 at the same transmission frame rate as the conventional video processing path such as 60 fps. In the illustrated example, video information indicating whether the video data of each frame is video 1 or video 2 is output in parallel to the ASIC 12 as a 1-bit video selection signal. The video selection signal in the example is a status signal that takes a binary value of high / low at the output signal level. For example, the period of the even frame is in the high status state at the output signal level, and the period of the odd frame is at the output signal level. Change to low status state.

  The ASIC 12 may classify and separate the video data of video 1 and video 2 that are alternately output for each frame in accordance with each status of the video selection signal.

  FIG. 7 illustrates a schematic block diagram of the ASIC 12. In the ASIC 12 illustrated in FIG. 7, the input processing unit 12c functions as a processing unit that separates the video data of video 1 and video 2 included in one video data for each frame according to the status state of the video selection signal. To do. The input processing unit 12c extracts, for example, odd-frame video data according to the status of the video selection signal and stores it in the display A memory 12d. Similarly, the input processing unit 12c extracts video data of even frames according to the status state of the video selection signal, and stores the video data in the display B memory 12d. The video data for each frame stored in the memory 12d for the display A is read at the display timing of the display A, for example, and subjected to display processing such as color correction, gamma correction, and contrast correction in the output control unit 12e. The data is output from the ASIC 12 at the display frame rate of the display A. Similarly, the video data for each frame stored in the display B memory 12d is read at the display timing of the display B, for example, and the output control unit 12e performs display processing such as color correction, gamma correction, and contrast correction. Are output from the ASIC 12 at the display frame rate of the display B. The video data output to each display is output in parallel.

The form of the video selection signal output from the GDC 11 to the ASIC 12 is not limited to FIG. For example, the frames of video data included in one video data are separated based on signal edges such as a rising edge that changes from low to high at the output signal level and a falling edge that changes from high to low at the output signal level. Also good. Further, for example, the GDC 11 outputs a pulse signal every odd number of frames, and the ASIC 12 includes a counter circuit that counts a measurement signal (for example, a clock signal) synchronized with the output pulse signal over a predetermined period. Each video data may be separated according to the number of measured signals.

  Returning to the flowchart illustrated in FIG. 4, the process of separating and extracting the input video from the video selection signal in S3 and storing it in the memory is executed by the input processing unit 12c and the memory 12d of the ASIC 12. Then, for example, the video data (11d, 11e) stored in the memory 12d is read at the display timing of the sub-display 14a in FIG. 3, and a predetermined display process is performed via the output control unit 12e. Output in parallel (S4). Note that the ASIC 12 may synchronize the output timing between the video data output to each display.

  The GDC 11 in FIG. 6A outputs one video data to the ASIC 12 at a transmission frame rate of 60 fps. For video data transmitted at 60 fps, when video data of video 1 is output to odd frames and video data of video 2 is output to even frames, individual video data is output from the GDC 11 to the ASIC 12 at a transmission frame rate of substantially 30 fps. Is equal to Therefore, when data is output from the ASIC 12 to each display at a display frame rate of 60 fps, video data stored in the memory 12d is output every two consecutive frames. In the illustrated example, each video displayed and output on each display is a video that is updated every two consecutive frames at a display frame rate of 60 fps. That is, the video 1 displayed on the display 1 is a video in which the odd-frame video data is updated every two frames. Similarly, the video 2 displayed on the display 2 has the even-frame video data every two frames. The video will be updated.

  In the video display process of FIG. 6A, the video displayed and output on each display is updated at a display frame rate of two frames. Therefore, in a video such as a moving image, smoothness between the images constituting the moving image is achieved. Although it is slightly lower, for example, in a video that displays the vehicle status such as air conditioner and fuel consumption, the time interval of the status change is longer than the update interval of every 2 frames, so smoothness between each video may be a problem There is no.

  FIG. 6B is an example of a time chart in which the transmission frame rate between the GDC 11 and the ASIC 12 is doubled. The GDC 11 in FIG. 6B outputs, for example, one image data drawn and generated to the ASIC 12 at 120 fps, which is twice 60 fps. As illustrated in FIG. 6B, since the transmission frame rate is doubled, two video data composed of image frames having a 120 fps cycle are continuously included in one frame having a 60 fps cycle. it can.

  For example, in FIG. 6B, the interval between consecutive frames of video 1 and video 2 to which the same frame number such as “2frm” is assigned is equal to one frame interval of 60 fps. Video 1 and video 2 of each frame number output at a transmission frame rate of 120 fps are included in the same frame output at a transmission frame rate of 60 fps. That is, the GDC 11 can output two pieces of video data within a transmission frame rate of 60 fps by setting the transmission frame rate to double speed. In the illustrated example, the rate of the video selection signal is also doubled and output to the ASIC 12.

In the ASIC 12, for example, video data output at a double transmission frame rate may be separated into data frames of video 1 and video 2 according to the status state of the video selection signal. For example, each video data separated by the input processing unit 12c illustrated in FIG. 7 is temporarily stored in the memory d for each display. The video data stored in each memory 12d is read at the display timing of each display, subjected to display processing by the output control unit 12e, and output in parallel from the ASIC 12 at the display frame rate of the display.

  In FIG. 6B, video 1 is output from the ASIC 12 to the display 1 at a display frame rate of 60 fps, and video 2 is output from the ASIC 12 to the display 2 at a display frame rate of 60 fps. Since the image frames constituting each video are updated at a display frame rate of 60 fps, for example, even a video such as a moving image does not reduce the smoothness between the pixels constituting the moving image.

  As described above, in the video system 10 according to the present embodiment, data output between the GDC 11 and the ASIC 12 is performed in transmission frames having the same period. For this reason, in the video system 10 of this embodiment, the arbitration circuit which mediates a clock period between different video data according to a display becomes unnecessary. The form illustrated in FIG. 6A is effective for a video or a still image in which a state change occurs at a time interval longer than the display frame rate update interval, such as an air conditioner or fuel efficiency.

  On the other hand, even if the provided video content is terrestrial digital television broadcast or high-quality playback video, the video quality required for each display can be increased by processing at a higher transmission frame rate between the GDC 11 and the ASIC 12. Will not be reduced. Even in this case, since the data output between the ASIC 12 and the display is performed in the transmission frame of the same cycle, an arbitration circuit that mediates the clock cycle between different video data according to the display becomes unnecessary.

  Returning to the flowchart illustrated in FIG. 4, for example, the video system 10 according to the present embodiment performs the processing of S <b> 1 to S <b> 4 until the ignition key of the vehicle is in the “OFF” position and the “supplied power” is stopped. Are repeatedly executed.

  For data output between the GDC 11 and the ASIC 12 of the video system 10 of the present embodiment, for example, a transmission frame rate may be set according to video content. For example, the GDC 11 can include a table that stores transmission frame rates associated with each video content. For example, “40 fps” for “DVD” and “TV”, “20 fps” for “still image”, “20 fps for“ navigation ”,“ 40 fps ”for“ camera ”, etc. The transmission frame rate associated with each displayable content can be stored. As an example, in the case where video 1 in FIG. 6 is a moving image such as “DVD”, “TV”, and “camera” and video 2 is a still image such as “still image”, one video including two video data. Assume that data is output at a transmission frame rate of 60 fps. The video data output at a transmission frame rate of 60 fps can include video 1 at a frame interval of 40 fps and video 2 at a frame interval of 20 fps. Thus, when the video data is a combination of a moving image and a still image, the transmission frame rate of the moving image can be made higher than the transmission frame rate of the still image.

  Further, when the video data drawn / generated by the GDC 11 draws and displays a vehicle state such as an air conditioner or fuel consumption, the GDC 11 is transmitting the video data drawn / generated according to the change of the vehicle state at a predetermined cycle. The video data can be interrupted and output to the ASIC 12. FIG. 8 illustrates a timing chart in which, while outputting one video data, the other video data that has changed due to a change in the vehicle state is interrupted and output to the ASIC 12.

In the example of FIG. 8, for example, the video 1 displayed on the display 1 is a moving image captured by a camera or the like, and the video 2 displayed on the display 2 is a drawn image generated according to the vehicle state of an air conditioner or the like. And The GDC 11 outputs, for example, a moving image that changes at the display frame rate of the display 2 to the ASIC 12 as video data at a certain period. On the other hand, in the case of a drawn image generated according to the vehicle state, a still image whose image does not change is output to the ASIC 12 during a period when the vehicle state does not change. The interval at which the vehicle state changes is at least longer than the update period of the display 1. For this reason, the GDC 11 continues to output the video 1 that is a moving image to the ASIC 12 preferentially at a constant cycle, and causes the ASIC 12 to interrupt the video 2 generated according to the vehicle state according to the change in the vehicle state. Can be output.

  In the example of FIG. 8, the image frame indicated by “frame 3” indicates, for example, video data of video 2 that is interrupted in accordance with a change in the vehicle state. Then, the GDC 11 changes the output signal level of a status signal such as a video selection signal (interrupt signal) in order to identify the video data in which the interrupt has occurred, and outputs it to the ASIC 12. In the ASIC 12, as described above, the input processing unit 12c illustrated in FIG. 7 stores the video data output at the timing of “frame 3” in the predetermined memory 12d in accordance with the status change of the video selection signal. The video data of “Frame 3” stored in the memory 12d is read at the display timing of the display 2, and is output at the display frame rate of the display 2 via the output control unit 12e.

  In FIG. 8, in the video data output from the ASIC 12 to the display 2, the frame data string after the interrupted “frame 3” is indicated by “frame 3”. The video data output from the ASIC 12 to the display 2 changes from “frame x” output before “frame 3” at the read timing of the interrupted “frame 3”. Here, “frame x” is, for example, a drawing image of the vehicle state interrupted before “frame 3”. Further, in a period corresponding to “frame 3” of the video data output to the display 1 in parallel from the ASIC 12, the data of “frame 2” output from the GDC 11 before the interruption is redundantly read.

  In this way, when one side outputs video data based on a moving image and the other side video data based on a still image to the ASIC 12 as one video data, the moving image is transmitted at a predetermined cycle, and the still image When changed, it can be output by interrupting the transmission frame of the moving image. In the example of FIG. 8, a 1-bit video selection signal is used to identify the interrupted video data. For example, setting information indicating the frame position of the interrupted video data is output at a predetermined cycle. It may be added to a part of the video data to be output and output to the ASIC 12.

<Example 2>
Next, a case (2) in which a plurality of video data is output to the ASIC 12 using a blanking period will be described with reference to FIGS. In the video display processing of the video system 10 of Example 2 (hereinafter referred to as the present embodiment), one video is output within the effective range of the video data displayed on the display for the transfer of the video data between the GDC / ASIC. Then, the other video is output within a blanking period that is outside the effective range. The configuration of the video system 10 according to the second embodiment includes the GDC 11 and the ASIC 12 as in the first embodiment. In the following description, video 1 is video data displayed and output on display 1, and video 2 is video data displayed and output on display 2.

  FIG. 9 illustrates a flowchart of the video display process of the present embodiment. The flowchart illustrated in FIG. 9 outputs video 1 within the effective range of the display 1 and outputs video 2 within a blanking period that is outside the effective range of the display 1. In FIG. 9, the process of S5-S6 is executed by the GDC 11, and the process of S7-S8 is executed by the ASIC 12.

  In S5 of FIG. 9, the GDC 11 draws and generates video data corresponding to the display 1 and the display 2 based on the provided video content. Then, the GDC 11 outputs the video 1 within the effective range of the display 1 and outputs the video 2 within the blanking period that is outside the effective range of the display 1, so that the compression rate (reduction rate) of the video 2 is determined. . Since the blanking period for outputting the video 2 is shorter than the effective range period for displaying the video 1 on the display 1, the GDC 11 compresses the video 2 at a predetermined compression rate. Video information such as the compression rate (reduction rate) determined by the GDC 11 and the data valid range within the blanking period is notified to the ASIC 12. The notification of the video information from the GDC 11 to the ASIC 12 may be a video selection signal that identifies a data valid range within the blanking period with a high / low status of the signal level as exemplified in FIG. In addition, a part of the video 2 may be embedded as additional data and notified. Further, the notification timing of the video information from the GDC 11 to the ASIC 12 may be notified at the first time when the data of the video 2 is output from the GDC 11 to the ASIC 12. For example, when the video 2 changes according to the vehicle state, the video information may be notified from the GDC 11 to the ASIC 12 at the change timing of the video image of the video 2.

  The GDC 11 outputs a composite video image including the video 1 and the video 2 to the ASIC 12 together with the video information notification (S6). Note that the GDC 11 also outputs video data such as navigation drawn / generated in accordance with the main display 13a illustrated in FIG. 3 in parallel to the display.

  FIG. 10 illustrates a time chart of the video display process of the present embodiment. In the time chart of FIG. 10, “horizontal synchronization” is, for example, a periodic signal indicating a display area in the horizontal direction of the display 1, and “effective range” indicates an effective range for displaying the video 1. As apparent from the figure, the period of the effective range for displaying the video 1 indicated by the “effective range” is synchronized with the horizontal synchronization signal indicated by “horizontal synchronization”.

  In FIG. 10, the video data output from the conventional GDC 11 to the ASIC 12 is, for example, video data to be displayed on the display 1 such as video 1 during the effective range period, as indicated by “current”. Here, the video data of video 1 constitutes a data frame output in time series synchronized with the horizontal synchronization signal, and each data frame of video 1 is connected via a blanking period shorter than the effective range period. Has been.

  In the video display processing of the present embodiment, the GDC 11 outputs the data frame of video 1 to the ASIC 12 during the effective range period, and outputs the data frame of video 2 to the ASIC 12 during the blanking period, as exemplified in “video data”. To do. In the illustrated example, “video 2 (n frame)” that is a data frame of video 2 is output in a blanking period subsequent to output of “video 1 (n frame)” that is a data frame of video 1. As described above, the data frame of video 1 and the data frame of video 2 output from the GDC 11 constitute a data frame of one composite video image.

  Returning to the flowchart illustrated in FIG. 9, the ASIC 12 separates the composite video image output from the GDC 11 into each video and temporarily stores it in the memory (S6). In the example of FIG. 7, for example, the input processing unit 12 c of the ASIC 12 generates a composite video based on video information such as a compression rate (reduction rate) and a data valid range within a blanking period notified together with the output of the composite video image. Perform image separation. The separated video 1 and video 2 are respectively stored in a predetermined memory 12d.

Video 1 stored in the memory 12d is read at the display timing of the display 1,
For example, the data is output from the ASIC 12 at the display frame rate of the display 1 through display processing such as the output control unit 12e in FIG. On the other hand, the video 2 stored in the memory 12d is read at the display timing of the display 2, and decompression processing according to the compression rate notified from the GDC 11 is performed. Such a decompression process is arbitrary, and may be restored to the pixel size of the video 2 before compression. For example, inter-pixel interpolation processing associated with image expansion processing such as linear interpolation processing or anti-aliasing can be exemplified. The expansion process of the video 2 is executed by, for example, the output control unit 12e in FIG. The video 2 that has been decompressed by the output control unit 12e is output from the ASIC 12 at the display frame rate of the display 2. Video 1 and video 2 are output in parallel to the respective displays (S7).

  In FIG. 10, “video 1” data indicated by 12 f is, for example, video data of video 1 separated by the input processing unit 12 c and stored in the memory 12 d. Similarly, the data of “video 2” indicated by 12g is video data of video 2 separated by the input processing unit 12c and stored in the memory 12d. In the illustrated example, each data frame of video 1 output in the effective range period indicated by “video data” is arranged in time series from “video 1 (1 line)” to “video 1 (480 lines)”. Yes. On the other hand, in the compressed video 2 data 12g, each data frame of video 2 output during the blanking period indicated by “video data” is changed from “video 2 (1 line)” to “video 2 (400 lines)”. ”In order of time series.

  In FIG. 10, “video 2” data indicated by 12h is video data of video 2 that has been subjected to decompression processing for each data frame stored in the memory 12d, and each data frame of the compressed data 12g is represented by data. This is the one restored to the pixel size of video 2 before compression. In the restored data 12h, “video 2 (1 line)” to “video 2 (480 lines)” are arranged in chronological order.

  As described above, in the video display process according to the second embodiment, the video 1 is output within the effective range of the display 1, and the video 2 compressed using the blanking period is output, thereby including a plurality of video data. One composite video image can be output. In the video display process according to the second embodiment, it can be regarded as a data frame for outputting one composite video image including a plurality of video data in the effective range period and the blanking period.

  In the video display processing of the present embodiment, for example, one video data may be output in the effective range period, and two video data compressed in the blanking period may be output. For example, the navigation video data displayed and output on the main display 13a illustrated in FIG. 3 is output during the effective period of the main display 13a, and the video data indicating the vehicle state displayed and output on the two sub-displays 14a is respectively compressed. It may be output during the blanking period of the main display 13a. In this case, the ASIC 12 may be separated into three pieces of video data based on the video information notified from the GDC 11. Each separated video data is temporarily stored in a memory, and after a predetermined display process including an expansion process, is output in parallel to each display at a display frame rate of each display.

  Also, the video data output during the blanking period is not compressed, and the video data is divided into a plurality of pixel sizes of the original image and output, and the video data divided by the ASIC 12 is combined for reconstruction. It may be intended. That is, the GDC 11 outputs one composite video image including the video data of the display 1 and the video data of the display 2 divided into a plurality of parts to the ASIC 12. A timing chart of such video display processing is illustrated in FIG.

In the timing chart illustrated in FIG. 11, “vertical synchronization (input)” is, for example, a periodic signal indicating a vertical display area of the display 1, and “effective range” is an image in the display area of the display 1. The effective range for displaying 1 is shown.

  As illustrated in “video data (input)” in FIG. 11, the GDC 11 outputs the data frame of video 1 to the ASIC 12 during the effective range period, and the data frame of video 2 divided into a predetermined number during the blanking period. Output to the ASIC 12. In the illustrated example, the video 2 divided into two is output to the ASIC 12 in two frames of “video 2 (upper n frame)” and “video 2 (lower n frame)”.

  For example, the ASIC 12 separates the composite video image based on the video information related to the division of the video 2 notified together with the composite video image, and temporarily stores it in the corresponding memory. As illustrated in “Memory 2” in the figure, the ASIC 12 sets a storage area according to the number of divisions in advance when storing the data of the separated video 2 in the memory, and continues to the set predetermined area. Then, the divided data may be stored. In the illustrated example, “video 2 (upper n frame)” output during the blanking period at the timing of “bank 1 write” is stored in the memory, and “video 2 (lower n frame)” output during the subsequent blanking period. "Is stored in the memory at the timing of" Bank 1 write (continued) ".

  Each divided data of the video 2 stored in the “memory 2” is read out in synchronization with a display timing indicated by “vertical synchronization (output)”. As exemplified in “memory 2”, the data is read across two consecutive frames at the timing of “bank 2 read” synchronized with “vertical synchronization (output)”. For example, the read divided data are combined by the output control unit 12e illustrated in FIG. 3 and reconstructed to the pixel size of the video 2 before division. In the timing chart of FIG. 11, as illustrated in “video 1 (output)” and “video 2 (output)”, the reconstructed video data of video 2 is in parallel with the frame output of video 1 in two frames. Is output from the ASIC 12 to the display 2.

  Note that the number of divisions of video 2 output during the blanking period can be arbitrarily set. For example, in the case of three divisions, each divided data may be output over three frames, and in the n division, data divided into n over n frames may be output. The ASIC 12 may combine the n-divided data based on the video information notified from the GDC 11 and reconstruct the video data before the division.

<Example 3>
Next, with reference to FIG. 12 to FIG. 14, a case (3) in which a drawing clock is speeded up to generate a plurality of videos will be described. FIG. 12 illustrates an explanatory diagram of a video display process of Example 3 (hereinafter referred to as the present embodiment). As described above, the GDC 11 draws and generates video data to be displayed and output on the display based on the provided video content. As shown in 11d of FIG. 12, for example, the GDC 11 has 800 × WVGA (Wide-VGA) having color information of R, G, and B quantized with a predetermined clock signal (33 MHz in the example). Video data of video 1 is generated with a screen resolution of 480 pixels. As a result, the pixels of the video data 11d of the video 1 are aligned at a predetermined clock cycle.

  In the video display process of the present embodiment, the GDC 11 doubles the clock rate at the time of drawing / generation, draws / generates video data corresponding to two displays, and generates one composite video image. In the example of FIG. 12, the composite video image 11g has 800 × 480 pixel video data 11e drawn and generated at a double clock rate and 800 × 480 drawn and generated at a double clock rate. Image data 11f of pixel image 2 is included. The video data 11e and the video data 11f are synthesized in parallel in the horizontal direction (lateral direction) on one synthesized video image 11g.

  As described above, in the video display processing of the present embodiment, it is possible to increase the pixel density by increasing the clock rate at the time of drawing and generation. One composite video image output from the GDC 11 to the ASIC 12 is an image in which two video data with increased pixel density are aligned. As illustrated in 10a of FIG. 12, the composite video image 11g generated by the GDC 11 is output to the ASIC 12 at a transmission frame rate of 60 fps, for example. In each frame, the frame data of video 1 and video 2 drawn and generated at a double clock rate are output in alignment with the pixel size of the original image. In the video display processing of the present embodiment, data transfer between the GDC 11 and the ASIC 12 is, for example, one video data including the video 1 and the video 2 without increasing the transmission frame rate as shown in the first embodiment. Can be performed with the pixel size of the original image. Further, since data can be exchanged between the GDC 11 / ASIC 12 with the pixel size of the original image, for example, as shown in the second embodiment, video data compression / decompression processing is not performed.

  In the example of FIG. 12, the clock rate of the GDC 11 at the time of drawing / generation is doubled, and video data to be displayed and output on two displays is generated at a double clock rate. The video display process of this embodiment is not limited to the example of FIG. For example, when video data is displayed and output on three displays, the clock rate of the drawing / generation processing of each video data can be tripled. Then, the three video data drawn and generated at the triple clock rate may be included in one video data and output to the ASIC 12 at a transmission frame rate of 60 fps.

  As described above, in the present embodiment, the number of displays to which the video system 10 is connected matches the number of multiplications of the clock rate. That is, video data to be displayed and output on n displays is drawn and generated at an n times clock rate. The n pieces of video data drawn and generated at the clock rate of n times are output to the ASIC 12 at a predetermined transmission frame rate as one piece of video data including at least n pieces of video data.

  In the present embodiment, the number of displays connected to the GDC / ASIC is transferred by transferring the data between the GDC / ASIC by matching the number of displays to which the video system 10 is connected and the multiplication rate of the clock rate. Even if it increases, it does not change. That is, even when two displays or n displays are provided, a common transmission frame rate can be used for data transfer between the GDC / ASIC.

  In the ASIC 12, for example, each video included in the composite video image may be separated based on the video information notified from the GDC 11 together with the composite video image. The separated video data for each video is temporarily stored in a memory, read at a display timing corresponding to each display, and output to the display. For example, video data of video 1 is output from the ASIC 12 at the display frame rate of the display 1. Similarly, video data of video 2 is output from the ASIC 12 at the display frame rate of the display 2. Each video data is output in parallel from the ASIC 12 as illustrated in 10a of FIG.

  FIG. 13 illustrates a flowchart of the video display process of the present embodiment. In FIG. 13, the processing of S9-S10 is executed by the GDC 11, and the processing of S11-S12 is executed by the ASIC 12. Note that the GDC 11 also draws and generates video data such as navigation that is displayed and output on the main display 13a illustrated in FIG.

In S9 of FIG. 13, the GDC 11 renders and generates video data corresponding to the display 1 and the display 2 based on the provided video content. As described above, the video data of the video 1 and the video 2 drawn / generated by the GDC 11 is video data drawn / generated at a clock rate of twice, which is a multiplication number that matches the number of displays. The GDC 11 generates one video data including the video 1 and the video 2, and notifies the ASIC 12 of the number of videos included in one video data as video information (S9). The notification of the video information may be a video selection signal for identifying video data with a high / low status of the signal level, as exemplified in FIG. 6 and the like, for example, as part of one video data. For example, it may be embedded as additional data and notified during a blanking period. Further, the notification timing of the video information from the GDC 11 to the ASIC 12 may be notified when one video data (composite video image) is output for the first time.

  The GDC 11 outputs one composite video image including the video 1 and the video 2 together with the notification of the video information to the ASIC 12 at a predetermined transmission frame rate (S10). Note that the GDC 11 also outputs video data such as navigation drawn / generated in accordance with the main display 13a illustrated in FIG. 3 to the display 13a in parallel.

  FIG. 14 illustrates a time chart of the video display process of the present embodiment. In the time chart of FIG. 14, “horizontal synchronization (input)” is, for example, a periodic signal indicating a horizontal display area of the display 1, and “effective range” is for displaying video data on the display 1. Indicates the effective range.

  In the video display process of the present embodiment, the GDC 11 outputs a data frame of a composite video image to the ASIC 12 during the effective range period, as exemplified by “video data (input)”. In the illustrated example, a data frame of a composite video image composed of “video 1 (n line)” and “video 2 (n line)” is output in synchronization with the effective range period. As illustrated in FIG. 12, each video data is line data of 800 pixels drawn and generated at a double clock rate.

  Returning to the flowchart illustrated in FIG. 12, the ASIC 12 separates the composite video image output from the GDC 11 for each video and temporarily stores it in the memory (S11). The separation of the composite video image is executed by, for example, the input processing unit 12c illustrated in FIG. 7 based on the video information notified from the GDC 11. The video 1 data separated by the input processing unit 12c is temporarily stored in the memory 12d at the timing of "line memory 1-1" indicated by "video 1 memory" in FIG. Similarly, the video 2 data is temporarily stored in the memory 12d at the timing of the “line memory 2-1” indicated by “video 2 memory” in FIG.

  In the time chart of FIG. 14, “horizontal synchronization (output)” is a periodic signal indicating the display area in the horizontal direction of the display 1, for example, and the display timing of the display 1. The video 1 stored in the memory 12d is read at the timing of “line memory 1-1 read” indicated by “video 1 memory”, and “video 1 (n lines) indicated by“ video 1 (output) ”. ) "At the timing. The video 2 stored in the memory 12d is read at the timing of “line memory 2-1 read” indicated by “video 2 memory” and “video 2 (output)” indicated by “video 2 (output)”. n line) ”is output to the display 2. The timings of “Video 1 (n line)” and “Video 2 (n line)” are synchronized.

  Returning to the flowchart of FIG. 12, as described above, each video data separated and stored in the memory is read from the memory at the display timing of each display, and is output to each display at the same timing (S12). . For example, the video system 10 according to the present embodiment repeatedly executes the processes of S9 to S12 until the ignition key of the vehicle is in the “OFF” position and “suppressed display” in which the supplied power stops.

[In-vehicle machine]
FIG. 15 illustrates an AVN device 1 including the video system 10. 15 constitutes an information processing system that can be mounted on a vehicle. Such an information processing system may be an information portable terminal such as a mobile phone having a plurality of displays, a smartphone, or a PDA (Personal Digital Assistant). Further, it may be an information processing apparatus such as a notebook PC (Personal Computer) or a tablet PC having a plurality of displays.

  The control unit 101 receives an input of a signal from each part of the AVN machine 1 or a connected external device, an operation instruction signal from each operation part based on a user's operation, and each part of the AVN machine 1 based on these signals. Alternatively, it is a control unit that comprehensively controls external devices and is configured by, for example, a microcomputer and operates according to a program stored in a memory such as a ROM.

  The broadcast receiving unit 102 is a receiving unit that selectively receives a broadcast wave of a specific frequency from broadcast waves received by an antenna, demodulates and outputs an audio signal and an image signal of the broadcast, and includes a tuning circuit, a demodulator / decoder It comprises a decoding circuit, a frame management circuit, and the like. The broadcast receiving unit 102 is controlled by a control signal from the control unit 101 for various operations such as on / off of the broadcast receiving unit 102 and selection of reception frequency (channel selection).

The disc playback unit 103 reads and reads data recorded on a disc such as a CD (Compact Disc), an MD (Mini Disc), a DVD (Digital Versatile Disc), and a Blu-ray Disc (Blu-ray Disc) with a pickup. An audio signal and a video signal based on the data are output to the distribution circuit 108. The disk reproducing unit 103 includes an optical pickup, a pickup disk driving mechanism, a control circuit for the pickup disk driving mechanism, a decoding circuit for a read signal, and the like, and various operations such as on / off and a reading position are controlled by a control signal from the control unit 101. Is controlled.

  An HD (hard disk) reproduction unit 104 reads desired data from various data recorded on a hard disk, which is a magnetic recording medium, and outputs the read image signal, audio signal, character signal, or the like to the distribution circuit 108. Music data such as MP3 files, image data such as JPEG files, map data for navigation, and the like are recorded on the hard disk. The HD reproduction unit 104 includes a read signal decoding circuit and the like, and various operations such as on / off and read data are controlled by a control signal from the control unit 101.

The navigation unit 105 displays the position of the host vehicle and the route to the destination on the map displayed on the display 113, provides a direction of travel such as a right or left turn by voice or the like at an intersection, or the like, or the VICS information reception unit 106 The traffic information is received and displayed from the vehicle, or the vehicle position information is received and displayed from the GPS information receiving unit 107 to provide route guidance to the destination. The navigation unit 105 includes a memory 115 such as a hard disk that records map information used for navigation, a CPU (Central Processing Unit) that performs various arithmetic processes, and a RAM (Random Access Memory) that stores data for various processes. Is provided. The navigation unit 105 is controlled to be turned on / off and various operations by a control signal from the control unit 101.

The VICS information receiving unit 106 receives traffic information related to a traffic information communication system (VICS (registered trademark): Vehicle Information and Communication System), and outputs the received traffic information. The VICS information receiving unit 106 includes a receiver (FM receiver, radio beacon receiver, optical beacon receiver) that receives data from the traffic information communication system, a decoding circuit that decodes the received data, and the like. The GPS information receiving unit 107 detects the vehicle position based on the GPS signal from the GPS (registered trademark) satellite, and outputs the detected current position information. The GPS information receiving unit 107 includes a receiving circuit that receives a GPS signal, an arithmetic circuit that calculates the vehicle position based on the received GPS signal, and the like.

  The camera 119 is a camera that takes an image of the surroundings of the vehicle and inputs moving image data (video information and audio information) via the external audio / video input unit 118. Video information captured by the camera 119 is subjected to video processing, displayed on the plurality of displays 113 via the distribution circuit 108, the image adjustment circuit 109, and the video display processing unit 10, and used for parking assistance and the like. The moving image data shot by the camera 119 may be recorded in the HD drive or the memory 115 in the HD playback unit 104 via the distribution circuit 108 for a drive recorder or the like.

  The external audio / video input unit 118 performs processing such as converting the moving image data of the camera 119 into a video signal to be displayed on the display 113. The external audio / video input unit 118 is controlled to be turned on / off and various operations by a control signal from the control unit 101.

  The distribution circuit 108 includes various sources (broadcast receiving unit 102, disc playback unit 103, HD playback unit 104, navigation unit 105, external audio / video input unit 118) designated to be output by a control signal from the control unit 101. The audio signal and the image signal of an external recording medium reproducing unit (not shown) are output to the image adjustment circuit 109 and the audio adjustment circuit 110. The distribution circuit 108 includes a switch group composed of an electronic circuit such as a relay or a switching transistor.

  The sound adjustment circuit 110 adjusts the volume and sound of the input sound signal according to the control signal of the control unit 101, and outputs the adjusted sound signal. The sound adjustment circuit 110 includes a memory for storing sound data, an arithmetic circuit such as a digital signal processor for processing sound data, an amplification or attenuation circuit constituted by a transistor, a resistor, a coil, and the like, a resonance circuit, and the like. The speaker 111 outputs the audio signal output from the audio adjustment circuit 110 as audio.

  The image adjustment circuit 109 adjusts the brightness, color tone, contrast, and the like of the input image signal according to the control signal of the control unit 101, and outputs each adjusted image signal. The image adjustment circuit 109 includes a memory that stores image data, an arithmetic circuit such as a digital signaling processor that performs arithmetic processing on the image data, and the like. In the present embodiment, the image adjustment circuit 109 functions as the GDC 11 that constitutes the video system 10.

  The image output unit 112 inputs the image signal input from the image adjustment circuit 109 and the display image signal to be displayed on the display 113 from the control unit 101, performs processing such as image composition, and the image signal subjected to the processing The display 113 is driven based on the above. In the present embodiment, the image output unit 112 functions as the ASIC 12 constituting the video system 10. The ASIC 12 displays and outputs video data corresponding to the plurality of displays (113 # 1, 113 # 2).

  The display 113 displays an image based on the image signal input from the image output unit 112 (ASIC 12 in this embodiment). The display 113 is, for example, a liquid crystal display, an organic EL display, a plasma display, a cold cathode flat panel display, or the like. The display 113 includes a backlight, a liquid crystal panel, a touch panel, and the like.

The operation unit 114 is an input unit for the user to perform various operations on the AVN machine 1, and is, for example, a touch panel, a push button switch, a rotation operation switch, a joystick, or the like. The operation unit 114 outputs operation states of various operations by the user to the AVN device 1 to the control unit 101. The remote operation unit 116 is, for example, a remote control provided with an infrared element or the like. The remote operation unit 116 has the same function as the operation unit 114.

The ETC on-vehicle device 120 is an on-vehicle device having a function of automatically paying a fee by communicating with a terminal on the ETC lane side in an ETC (registered trademark: Electronic Toll Collection) system. The communication unit 121 is a communication interface for wireless communication such as DSRC (Dedicated Short Range Communication), infrared communication, Bluetooth (registered trademark), etc., connected to an antenna.

<Computer-readable recording medium>
A program for causing a computer or other machine or device (hereinafter, a computer or the like) to realize any of the above functions can be recorded on a recording medium that can be read by the computer or the like. The function can be provided by causing a computer or the like to read and execute the program of the recording medium.
Here, a computer-readable recording medium is a recording medium that stores information such as data and programs by electrical, magnetic, optical, mechanical, or chemical action and can be read from a computer or the like. Say. Examples of such a recording medium that can be removed from a computer or the like include a flexible disk, a magneto-optical disk, a CD-ROM, a CD-R / W, a DVD, a Blu-ray disk, a DAT, an 8 mm tape, a flash memory, and the like. There are cards. In addition, as a recording medium fixed to a computer or the like, there are a hard disk, a ROM (read only memory), and the like.

1 AVN machine 10 Video system 11, 91, 91A, 91B GDC
12, 92, 92A, 92B ASIC
12c Input processing unit 12d Memory 12e Output control unit 13, 13a, 93 Main display 14, 14a, 94 Sub display 15 Meter hood 16a Speedometer 16b Tachometer 17 Memory 101 Control unit 102 Broadcast receiving unit 103 Disc playback unit 104 HD playback Unit 105 Navigation unit 106 VICS information receiving unit 107 GPS information receiving unit 108 Distribution circuit 109 Image adjustment circuit (GDC)
110 Audio adjustment circuit 111 Speaker 112 Image output unit (ASIC)
113 Display 114 Operation Unit 115 Memory 116 Remote Operation Unit 118 External Audio / Video Input Unit 119 Camera 120 ETC On-board Unit 121 Communication Unit

Claims (9)

A video generation device that outputs video in a frame sequence of a predetermined frame transmission rate;
An output control device that receives video from the video generation device at a frame sequence of the frame transmission rate and outputs the video to a display device;
A plurality of display devices,
The video generation device outputs a composite video frame sequence combining a plurality of video frame sequences output to a plurality of display devices,
The output control device is a video system that extracts a frame sequence of an individual video output to each display device from the frame sequence of the composite video. The video generation device arranges and outputs a frame of an individual video frame sequence output to the first display device and a frame of an individual video frame sequence output to the second display device at a predetermined ratio. To output a frame sequence of the composite video,
The video system according to claim 1, wherein the output control device extracts frames of individual videos output to the respective display devices from the composite video frame sequence at the predetermined ratio.   2. The video system according to claim 1, wherein the video generation device outputs a frame sequence of the synthesized video at a multiplied frame rate obtained by multiplying the predetermined frame rate by a magnification of the number of videos to be synthesized. When the individual video output to one display device is a still image, the video generation device displays an image obtained by changing the still image in one of the frame sequences of the video output to another display device. A frame sequence of the composite video is output by interrupting as a frame, and a specific signal for specifying the interrupted one frame is output,
2. The video system according to claim 1, wherein the output control device separates the interrupted frame from the frame sequence of the synthesized video in accordance with a specific signal that specifies the frame. The frame sequence output at the predetermined frame transmission rate has an effective period of frames and a blanking period between frames,
The video generation device outputs a frame sequence of individual video output to the first display device during the blanking period,
2. The video according to claim 1, wherein the output control device outputs a frame sequence of the individual video in the effective period to a first display device, and outputs a frame sequence of the individual video in the blanking period to another display device. system. The video generation device reduces the frame sequence output during the blanking period according to the length of the blanking period,
The video system according to claim 5, wherein the output control device decompresses the frame sequence acquired during the blanking period according to the length of the blanking period and restores the frame sequence to an individual video. The video generation device divides the frame sequence output during the blanking period according to the length of the blanking period, and outputs the divided frame sequence to a plurality of blanking periods.
The video system according to claim 5, wherein the output control device combines the frame sequences acquired during the blanking period to restore the frame sequence of the individual video output to the second display device. The video generation device expands the number of pixels in the vertical direction or the horizontal direction of each frame in the frame sequence by the number of individual videos to be combined, and adds each frame of a plurality of individual videos to the horizontal direction of each pixel. A combined frame is generated by combining in the direction or the vertical direction, and the transmission rate of the pixels in each frame is output at a frequency multiplied by the number of the individual images.
The video system according to claim 1, wherein the output control device extracts a frame of each individual video from the combined frame in combination with a horizontal direction or a vertical direction of pixels. A video generation device that outputs video in a frame sequence of a predetermined frame transmission rate;
An output control device for outputting the video to a display device;
A plurality of display devices,
A video generation device that outputs video at a frame sequence of a predetermined frame transmission rate, a step of outputting a composite video frame sequence obtained by combining a plurality of frame sequences respectively output to a plurality of display devices;
The output control device is
Receiving video from a video generation device in a frame sequence of the frame transmission rate;
Extracting a frame sequence of an individual video output to each display device from the frame sequence of the synthesized video;
Outputting the frame sequence of the individual video to each display device.

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