JP2013062839A - Video transmission system, video input device, and video output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional video transmission system capable of transmitting three-dimensional video data from a video output device to a video display device through an interface based on the HDMI standard without discrepancy, the video display device and the video output device.SOLUTION: In a recording and reproducing device 100, 3D compressed video data recorded in an optical disk 101 is reproduced in a recording and reproducing unit 102 and restored to baseband 3D video data in a codec 103. A format conversion unit 104 converts a recording format of the optical disk 101 to an HDMI transmission format corresponding to the display capacity of a display device 200 acquired beforehand and outputs the transmission format. A format conversion part 204 of the display device 200 converts the transmission format of the 3D video data received through an HDMI cable 205 to a display format. A display control part 201 displays the 3D video data converted to the display format on a display panel 202.

Description

  The present invention relates to a stereoscopic video transmission system that transmits a stereoscopic video, and a video display device and a video output device that constitute the stereoscopic video transmission system, and in particular, a video transmission system, a video input device, and The present invention relates to a video output device.

  Conventionally, various methods have been proposed for stereoscopic viewing of television images. These are based on the principle of binocular parallax, and the left eye image and right eye image are displayed on a single display by switching spatially or temporally alternately, and the viewer wears special glasses. A stereoscopic image is obtained by viewing with or without the naked eye.

  In recent years, devices having an HDMI terminal compatible with the High Definition Multimedia Interface (HDMI) standard have become widespread. For example, by connecting a TV and a DVD recorder with an HDMI connection cable, high-quality video, audio data, and various control information can be transmitted and received between devices.

  By the way, there are SD (Standard Definition) and HD (High Definition) as video formats of television, and many video formats with different scanning lines and frame rates are already popular in HD.

  On the other hand, video devices such as televisions and DVD recorders generally have different functions and performance depending on manufacturers, release dates, price ranges, etc., and video formats that can be transmitted and received are often different for each device.

  Therefore, even if video data or audio data in a format that does not correspond to each other is communicated, communication cannot be performed successfully. Such a problem can be solved by using various control information supported by HDMI.

  For example, when playing back audio / video data recorded on a DVD recorder via an HDMI connection cable and outputting it to a television, EDID information stored in a ROM called EDID (Extended Display Identification Data) is stored in advance from the television. Display capability, etc.), and in accordance with the acquired EDID, it can be converted into a television displayable format and output to the television (see, for example, Patent Document 1).

JP 2007-180746 A

  However, the conventional methods including Patent Document 1 do not consider transmission of stereoscopic video and still have problems when connecting stereoscopic video between devices.

  The present invention has been made to solve the above-described problems, and provides a video transmission system, a video input device, and a video that can transmit stereoscopic video data from a video output device to a video input device through an interface conforming to the HDMI standard without any contradiction. An object is to provide an output device.

  In order to achieve the above-described object, a video output device of the present invention is a video output device that outputs a video signal, and the video output device according to the reception capability of the video input device that inputs and processes the video signal. A format conversion unit that converts the format of the video signal output from the HDMI, and an HDMI transmission unit that outputs the video signal converted by the format conversion unit through an interface compliant with the HDMI standard. The format conversion unit outputs the video signal to be output Is a stereoscopic video signal, the two related video signals constituting the stereoscopic video signal, the signal width of the vertical synchronization signal output as the vertical synchronization of one of the two video signals, and the other A vertical synchronization signal having a signal width different from that of the vertical synchronization signal output as the vertical synchronization of the video signal is generated.

  A video input device of the present invention is a video input device that processes a video signal input from a video output device and a vertical synchronization signal, and an EDID storage unit that holds information of a video signal format that can be processed by the video input device; When the processable video signal held in the EDID storage unit is a stereoscopic video signal, the two related video signals constituting the stereoscopic video signal and one of the two video signals as vertical synchronization. An HDMI receiving unit configured to receive a vertical synchronization signal having a signal width of a vertical synchronization signal different from a signal width of a vertical synchronization signal as a vertical synchronization of the other video signal by an interface conforming to the HDMI standard.

  An output control method for a video output device according to the present invention is an output control method for a video output device that outputs a video signal, from the video output device according to the reception capability of the video input device that inputs and processes the video signal. A format conversion step for converting the format of the video signal to be output; and an HDMI transmission step for outputting the video signal converted by the format conversion step through an interface compliant with the HDMI standard. The format conversion step includes: When the format is a stereoscopic video signal, the signal width of the vertical synchronization signal output as the vertical synchronization of the two related video signals constituting the stereoscopic video signal and the video signal of one of the two video signals, and the other video A vertical synchronization signal having a signal width different from that of the vertical synchronization signal output as the vertical synchronization of the signal is generated.

  An input control method for a video input device according to the present invention is an input control method for a video input device that processes a video signal input from a video output device and a vertical synchronization signal, and the video input device recorded in an EDID storage unit A step of transmitting information on a video signal format that can be processed to a video output device that outputs the video signal, and a video signal transmitted from the video output device based on the information of the video signal format transmitted to the video output device is a stereoscopic video. In the case of a signal, the two related video signals constituting the stereoscopic video signal, the signal width of the vertical synchronization signal as the vertical synchronization of one of the two video signals, and the vertical as the vertical synchronization of the other video signal An HDMI reception step of receiving a vertical synchronization signal having a different signal width of the synchronization signal with an interface conforming to the HDMI standard.

  A video transmission system according to the present invention is a video transmission system including a video output device that outputs a video signal and a video input device that processes the video signal as an input. The video input device processes the video input device. An EDID storage unit that holds information of a possible video signal format, and an HDMI reception unit that receives a video signal output from the video output device through an interface compliant with the HDMI standard. When the information of the video signal format that can be processed by the video input device held in the unit indicates that the video signal format is a stereoscopic video signal, one of the two related video signals constituting the stereoscopic video signal and one of the two video signals A vertical sync signal in which the signal width of the vertical sync signal output as the vertical sync of the video signal differs from the signal width of the vertical sync signal output as the vertical sync of the other video signal Comprising the a format converter for generating a HDMI transmission unit that transmits to the image input device interface conforming the video signal format conversion portion is generated with the HDMI standard, a.

  The video transmission method of the present invention is a video transmission method for transmitting a video signal from a video output device that outputs a video signal to a video input device that processes the video signal as an input, and the video that can be processed by the video input device An information transmission step for transmitting signal format information to a video output device; and a video signal format information that can be processed by the video input device is a stereoscopic video signal. The vertical width of the related video signal is different from the signal width of the vertical synchronization signal output as the vertical synchronization of one of the two video signals and the vertical synchronization signal output as the vertical synchronization of the other video signal. A synchronization step, a conversion step for converting into a synchronization signal, and a transmission step for transmitting the converted video signal from the video output device to the video input device using an interface conforming to the HDMI standard. And, equipped with a.

  According to the present invention, it is possible to provide a video transmission system, a video input device, and a video output device that can transmit stereoscopic video data from a video output device to a video input device through an interface conforming to the HDMI standard without contradiction.

The figure which shows the structural example of the three-dimensional video transmission system in Embodiment 1 of this invention. Diagram for explaining the outline of HDMI The figure which shows the example of the parameter showing the capability (display and receiving capability) of the display apparatus in Embodiment 1 of this invention. The figure for demonstrating the display system (3D method) of 3D image | video The figure for demonstrating the transmission format (3D format) of 3D video data The figure for demonstrating in detail about 3D video transmission format (3D format) The figure for demonstrating two types of transmission methods of the L image and R image of an over-under system The figure which shows an example of the transmission method (transmission format) in the case of transmitting 3D image | video by an interlace system The figure which shows an example in the case of mapping 3D video data to the current HD signal transmission format of 1125 / 60i The figure for demonstrating the meaning of side priority (side priority) The figure explaining the format (memory map) of EDID in Embodiment 1 of this invention The figure explaining the format of the AVI info frame in Embodiment 1 of this invention The figure for demonstrating the format of CEC in Embodiment 1 of this invention The figure which shows the structural example of the stereoscopic video transmission system in Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram illustrating a configuration example of a stereoscopic video transmission system that transmits stereoscopic video (hereinafter, also referred to as “3D (Dimensional) video”) according to the present embodiment. In FIG. 1, a stereoscopic video transmission system 1 can display a video recording / reproducing apparatus (hereinafter abbreviated as “recording / reproducing apparatus”) 100 as a video output apparatus capable of reproducing a stereoscopic video, and a stereoscopic video as a video input apparatus. A video display device (hereinafter abbreviated as “display device”) 200 is provided. The recording / reproducing apparatus 100 and the display apparatus 200 are connected by an HDMI cable 205.

  The recording / reproducing apparatus 100 is, for example, a DVD recorder, and includes an optical disc 101, a recording / reproducing unit 102, a codec 103, a format converting unit 104, and an HDMI transmitting unit 110. The 3D compressed video data compressed by MPEG2 or the like recorded on the optical disc 101 is played back by the recording / playback unit 102 as video acquisition means, and restored to baseband 3D video data by the codec 103. The format conversion unit 104 converts the recording format of the optical disc 101 into a transmission format transmitted by HDMI. The HDMI transmission unit 110 transmits 3D video data to the display device 200 via the HDMI cable 205. The recording / reproducing apparatus 100 acquires in advance transmission format information that can be received by the display apparatus 200 from the display apparatus 200 via HDMI, and the format conversion unit 104 performs format conversion based on this information.

  If 3D video is recorded on the optical disc 101 in an uncompressed (baseband) manner, the codec 103 is not necessary.

  The display device 200 includes an HDMI receiving unit 210, a format conversion unit 204, a display control unit 201, and a display panel 202. The HDMI receiving unit 210 receives 3D video data transmitted through the HDMI cable 205. The format conversion unit 204 converts the transmission format of the received 3D video data into a display format. The display control unit 201 drives and controls the display panel 202 with the 3D video data converted into the display format. The display panel 202 is a plasma display panel (PDP) or a liquid crystal display (LCD), and displays 3D video.

  Note that the 3D video data includes two types of video data: left-eye video data (hereinafter sometimes simply referred to as “L”) and right-eye video data (hereinafter also simply referred to as “R”). It is composed of These two types of video data are transmitted separately, combined by the format converter 204, and displayed as 3D video. The transmission format and display format will be described in detail later.

  In the above description, the recording / reproducing apparatus and the display apparatus constituting the 3D video transmission system 1 are each one. However, this number is not limited to the present embodiment and may be an arbitrary number. .

  In the above description, the audio data is not mentioned, but it goes without saying that the audio data may be transmitted as needed.

  FIG. 2 is a diagram for explaining the outline of HDMI. HDMI transmits video data, audio data, and control information through three channels: TMDS (Transition-Minimized Differential Signaling) channel, DDC (Display Data Channel), and CEC (Consumer Electronics Control).

  The HDMI transmission unit 110 includes a TMDS encoder 111 and a packet processing unit 112, and the HDMI reception unit 210 includes a TMDS decoder 211, a packet processing unit 212, and an EDID_ROM 213.

  The video data, the H / V synchronization signal, and the pixel (pixel) clock are input to the TMDS encoder 111. The TMDS encoder 111 converts 8-bit data into 10-bit data, and also converts it into serial data to generate three TMDS. The data channel (data # 0, data # 1, data # 2) is used for transmission. The pixel clock is transmitted using the TMDS clock channel. The maximum transmission speed using the three data channels is 165 Mpixel / second, and 1080P video data can be transmitted using HDMI.

  Audio data and control data are packetized by the packet processing unit 112, converted into a specific 10-bit pattern by the TMDS encoder 111, and transmitted using video blanking periods of two data channels. In addition, a 2-bit horizontal / vertical synchronization signal (H / V synchronization) is also converted into a specific 10-bit pattern and transmitted by being superimposed on a blanking period of one data channel. Note that the control data includes auxiliary data of video called AVI (Axially Video Information) info frame, and the format information of the video data is transmitted from the recording / reproducing apparatus 100 to the display apparatus 200 using the AVI info frame. Can do. The AVI info frame will be described in detail later.

  Information representing the capability of the display device (sink) 200 is stored as EDID information in an EDID_ROM 213 as a storage means. The recording / reproducing apparatus (source) 100 can determine the format of video data and audio data to be output, for example, by reading the EDID information using the DDC.

  CEC can also operate a plurality of devices with one remote controller, for example, by bidirectionally transmitting control signals between devices connected by HDMI.

  Next, an example of parameters representing the capability (display and reception capability) of the display device 200 in the present embodiment will be described with reference to FIG. These parameters are information that only the display device (sink) 200 side has, and the recording / playback device (source) 100 side does not know. Accordingly, it is desirable information to be acquired from the display device 200 before the recording / reproducing apparatus 100 transmits 3D video data in the 3D video transmission system 1. These parameters are acquired by HDMI DDC (group A parameters) and CEC channel (group B parameters). Details will be described later.

In FIG. 3, 3D display possibility (3D Capability) indicates whether or not the display device 200 has a 3D display function (1; display capability, 0; no display capability). 3D display method (3D
method) indicates a 3D video display method (hereinafter also referred to as “display format”) of the display device 200, and is a time sequential method (time sequential; 0), a polarization method (polarizer; 1), a lenticular method (lenticular; 2). There are four systems: a parallax barrier (3).

  The 3D transmission format (3D format) indicates a transmission format of 3D video data that can be received by the display device 200, and includes a dot interleaved method, a line interleaved method, a side-by-side method, and an overunder. There are four transmission formats: over-under.

  As the image size (unit: pixel), there are a horizontal image size (image width) and a vertical image size (image height). The horizontal image size can be changed from 0 to 8192 pixels, and the vertical image size is from 0 to 4096 pixels. It can be changed.

  The screen size (unit: cm) includes a horizontal screen size (display width) and a vertical screen size (display height). The horizontal screen size can be changed from 0 to 9999 cm, and the vertical screen size can be changed from 0 to 4999 cm. It is.

  Further, the parallax compensation couple (parallax compensation couple) is a parallax correction capability (1; correction capability, 0; no correction capability). In other words, parallax correction is required because viewing conditions and the like differ between viewing the real object and viewing a 3D image on the display device 200. Parallax compensation is displayed by moving either the left-eye image (hereinafter also referred to as “L image”) or the right-eye image (hereinafter also referred to as “R image”) by a predetermined number of pixels relative to the other. This is performed by displaying on the screen of the apparatus 200. The number of pixels to be moved at this time is determined by the image size, the screen size, and the viewing distance (distance between the display device and the viewer).

  The virtual viewing distance (unit: cm) is a viewing distance that is a premise for parallax correction. These pieces of information (image size, screen size, virtual viewing distance) are necessary when performing parallax correction on the recording / reproducing apparatus 100 side and transmitting the corrected video data to the display apparatus 200 side.

  The last 3D processing delay (extra delay for 3D process; unit is a frame) is a delay time generated on the display device 200 side for 3D display processing. In order to synchronize video and audio (lip sync), it is used to execute delay processing in advance on the recording / reproducing apparatus 100 side.

  FIG. 4 is a diagram for explaining a 3D video display method (3D method). There are the following four types depending on whether special glasses are necessary or not, and the display panel drive conditions.

  FIG. 4A shows a time sequential method, in which L (left eye image) and R (right eye image) are alternately displayed on a display for each frame. Then, the viewer separates the left and right images in synchronization with the frame with the liquid crystal shutter glasses. The shutter operation of the liquid crystal shutter glasses and the display frame are synchronized using infrared communication or the like. For example, if a display panel (for example, PDP) is driven at 120P, 60P 3D video can be displayed.

  FIG. 4B shows a polarization method, in which a polarizing element is superimposed on a display panel (for example, a current LCD (liquid crystal display)) as a retardation film, and L (left) with polarized light orthogonal to each line (horizontal scanning line). (Eye image) and R (right eye image) are displayed. Three-dimensional images are obtained by separating the images of the lines having different polarization directions for each line using polarized glasses.

  FIG. 4C shows a lenticular system in which a special lens called a lenticular lens is placed on a pixel so that different images are displayed depending on the viewing angle. A lenticular lens is an array of many kamaboko-shaped convex lenses each having a size of several pixels. On the display panel (for example, LCD), L (left eye image) and R (right eye image) are decomposed once for each pixel and rearranged (rendered) again on the display pixels. When this is seen with both eyes, the viewing angle is different between the right eye and the left eye, so it appears as a 3D image. A feature of this method is that 3D images can be viewed with the naked eye without wearing special glasses.

  FIG. 4D shows a parallax barrier method, in which a barrier having an opening is placed in front of a display panel (for example, LCD), and the line-of-sight angle passing through the opening is different for both eyes. 3D images are obtained using the phenomenon. This method can also view 3D images with the naked eye without wearing special glasses.

  FIG. 5 is a diagram for explaining a transmission format (3D format) of 3D video data. The following five types of transmission formats are used in order to adapt to transmission conditions, display conditions, and the like.

  FIG. 5A shows a dot interleaving method in which L and R images are arranged in a checkered pattern in a frame.

  FIG. 5B shows a line interleaving method in which L and R images are alternately arranged for each line in a frame.

  FIG. 5C shows a side-by-side method, in which L and R images are arranged before and after the line (left and right of the screen) in the frame.

  FIG. 5D shows an over-under method, in which L and R images are arranged in time series (up and down the screen).

  FIG. 5E shows a (2d + depth) method, in which a 3D image is not expressed as an L or R image, but is expressed as a pair of a two-dimensional image and the depth of each pixel.

  Next, each parameter of the 3D video transmission format (3D format) shown in FIG. 3 will be described in detail with reference to FIG. Each parameter of the 3D video is information that only the recording / playback apparatus (source) 100 has, and the display apparatus (sink) 200 does not know. Therefore, it is desirable that the 3D video transmission system 1 transmits the 3D video data from the recording / reproducing apparatus 100 side to the display apparatus 200 side at the time of transmission or prior to transmission. These parameters are transmitted during the blanking period of the video data by the HDMI AVI info frame. Details will be described later.

  Normally, the transmission format of 3D video data transmitted by the recording / playback apparatus 100 is determined based on information acquired in advance from the display apparatus 200, but the display apparatus 200 may receive a plurality of transmission formats. If possible, the recording / reproducing apparatus 100 can select one of them. In this case, the recording / reproducing apparatus 100 transmits information on the selected transmission format to the display apparatus 200 using the AVI info frame.

  In FIG. 6, 3D video? (3D image?) Indicates whether the transmitted video data is a 3D video (1; 3D video, 0: normal video). The transmission format (format) is divided into two types depending on whether the 3D video display method is a glasses method (stereoscopic; 0) or a naked eye method (2d + depth; 1). Here, only the case of the glasses method will be described.

  The glasses method has three parameters: layout, image size, and parallax compensation. The layout includes the four 3D video transmission formats described with reference to FIGS.

  L / R arrangement (L / R mapping) indicates an arrangement when transmitting an L image and an R image. In the dot interleaving method (FIG. 5A), fixed (fixed; 0) or alternating for each line (alternating by line; 1) is shown. The line interleaving method (FIG. 5B) indicates whether the field is fixed (fixed; 0) or alternating for each field (alternating by field; 1). In this way, by changing the order of the L image and the R image for each line or each field, it is possible to increase the resolution of the display image as compared with the case where transmission is fixed. The side-by-side method (FIG. 5C) and the over-under method (FIG. 5D) are always fixed (0).

The L / R identification information (L / R identification) represents the transmission order of the L image and the R image. In the dot interleave method, the first pixel indicates whether the first image is an L image (0) or an R image (1), and in the line interleave method, the first line indicates an L image (0) or an R image (1). In the side-by-side method, the L image is displayed on the left half screen
side; 0) or the right half screen (right side; 1), or in the over-under method, the L image is placed on the upper half screen (upper; 0), or the lower half screen (lower; 1) Indicates whether to place in

By the way, in the case of the over-under method, there are two transmission methods as shown in FIG. A method of sending an L image and an R image as one image (one frame) as shown in FIG. 7A, and two L images and an R image as shown in FIGS. 7B and 7C ( 2 frames). When sending in one frame as shown in FIG. 7A, the L image and the R image can be easily identified by referring to the V synchronization signal. On the other hand, when sending divided into two frames as shown in FIGS. 7B and 7C, the L image and the R image cannot be discriminated only by referring to the V synchronization signal. Therefore, in order to identify the L image and the R image, it is possible to send the identification information of the L image and the R image in the AVI info frame, but the AVI info frame is not necessarily sent every frame. Therefore, as shown in FIG. 7 (b), it may be changed interval T _R of the V synchronizing signal interval T _L and R image of the V synchronizing signal of the L image. Also. As shown in FIG. 7 (c), it may be changing the width W _R of the V sync signal width W _L and R image of the V synchronizing signal of the L image.

  In FIG. 8, it is assumed that the L image and the R image of the 3D video are transmitted by the sequential scanning method (120P), respectively, but in this case, a transmission band twice as large as that of the 2D video is required. . Therefore, in order to transmit 3D video in the same transmission band as 2D video, the L image and the R image may be transmitted by an interlace method. By transmitting 3D video in an interlaced manner, not only the transmission band can be halved, but also the clock frequency of the processing circuit of the display device 200 can be halved, so that power consumption can be reduced. Furthermore, since the amount of data to be processed is halved, the capacity of the processing memory mounted on the display device 200 can be halved, and the cost of the processing circuit can be reduced.

  FIG. 8 is a diagram illustrating an example of a transmission method (transmission format) when 3D video is transmitted by an interlace method. One frame is divided into a TOP field and a BOTTOM field that are complementary to each other in the L image and the R image and transmitted. In the four fields, for example, the TOP field of the L image is transmitted in the first field, and the TOP field of the R image is transmitted in the second field subsequent thereto. Thereafter, the BOTTOM field of the L image is sent in the third field following the second field, and the BOTTOM field of the R image is sent in the fourth field. By transmitting the four fields of the 3D video in this order, the display device 200 can easily identify the four fields from the V synchronization signal by adding the V synchronization signal only once to the four fields. Can do. Further, by continuously transmitting the TOP fields of the R image and the L image and the BOTTOM fields as a pair, the processing on the display device 200 side is simplified. The transmission format is generated by the format conversion unit 104 of the recording / reproducing apparatus 100 in FIG. 1 and transmitted from the recording / reproducing apparatus 100 to the display device 200 by the HDMI transmitting unit 110. FIG. 9 is a diagram illustrating an example of mapping 3D video data to the current HD signal transmission format of 1125 / 60i. As shown in FIG. 9, it is possible to easily transmit 3D video data simply by inserting 3D video data in place of 2D video data into a conventional HD signal data area.

  When 3D video data is transmitted in the same transmission band as normal 2D video data, it is necessary to reduce the L and R video data by half and transmit the resolution to ½. On the other hand, if 3D video data is transmitted using a transmission band twice that of 2D video data, it can be transmitted in the same size, so that the resolution is maintained as it is. The image size represents the resolution of 3D video determined by the transmission path (band) in this way. Not squeezed (0) indicates that the screen is not reduced and the resolution does not decrease. Horizontal half size (horizontal half size; 1) indicates that the image is reduced in half in the horizontal direction (horizontal resolution is halved). It is a parameter related to transmission in the dot interleave method and the side-by-side method.

  On the other hand, the vertical half size (virtual half size; 2) indicates that the image is reduced to 1/2 in the vertical direction (vertical resolution is 1/2). It is a parameter related to the case of transmission by the line interleave method and the over-under method.

  The parallax compensation is a parameter related to parallax correction, and is different from the parallax compensation described with reference to FIG. 3 in that the parallax compensation is a parallax correction parameter on the display device 200 side. In contrast, in this case, the parallax correction state on the recording / reproducing apparatus 100 side is shown. Indicates either no parallax correction (0) or parallax correction (1). In the case of no parallax correction (0), a side priority is defined, and is not defined (not defined; 0), left side priority (left side; 1), or right side priority (right side; 2) Indicates either.

  Here, the meaning of the side priority will be described. When parallax correction is not performed on the recording / reproducing apparatus 100 side, parallax correction may be necessary on the display apparatus 200 side. As shown in FIG. 10, when the R image is shifted to the right by X pixels with respect to the L image on the display device 200 side for parallax correction, the L image is displayed on the entire display screen as shown in FIG. There are two display methods: a case where the image is displayed and a case where the R image is displayed on the entire display screen as shown in FIG. The display method in FIG. 10A has priority on the left side, and the display method in FIG. 10B has priority on the right side. In the above description, it is assumed that the R image is shifted to the right by X pixels with respect to the L image. Conversely, even when the R image is shifted to the left by X pixels with respect to the L image, the L image and the R image are shifted. It is the same just to become opposite.

  Further, in the case of parallax compensation with parallax correction (1), the virtual screen size (assumed width of display; unit is cm) assumed when the recording / playback apparatus 100 corrects ) Can be sent. The virtual screen size can be changed in the range of 0 to 9999 cm.

  Next, a method for transmitting various parameters related to the 3D video described with reference to FIGS. 3 and 6 will be described with reference to FIGS. As described in FIG. 2, in order to transmit control information between the transmission side (source) and the reception side (sink) according to the HDMI standard, the TMDS channel (AVI info frame), DDC (EDID), and CEC channel 3 Any kind of transmission line can be used. Therefore, if the various parameters related to the 3D video are transmitted by the most suitable method, the resource of the device, the bandwidth of the transmission path, etc. can be used effectively.

  In the present embodiment, the information on Group A in FIG. 3 is acquired as EDID information via the DDC, and the information on Group B is acquired on the CEC channel. The information of the B group is static information with a large amount of information such as image and screen size information or a low need for transmission in real time. By acquiring such B group information through the CEC channel, the capacity of the EDID_ROM 213 can be saved. Also, the transmission format information in FIG. 6 is sent as AVI info frame information using the TMDS channel.

  FIG. 11 is a diagram for explaining the format of EDID (memory map of EDID_ROM 213), and shows a format for mapping information of group A in FIG. 3 to HDMI VSDB (Vender-Specific Data Block) in EDID. 3D_present is allocated to Bit # 5 of Byte # 8 of VSDB. If 3D_present is “1”, it indicates that there is a 3D field, and if it is “0”, it indicates that there is no field. When there is a 3D field, a predetermined number of bytes are reserved from Byte # 13 according to the 3D field length. This 3D field length is defined by 3D_LEN4 to 3D_LEN0 assigned to 5 bits of Bit # 4 to Bit # 0 of Byte # 13. Data of a length (M bytes) defined by 3D_LEN continues from Byte # 14 to Byte # (13 + M). Byte # (14 + 3D_LEN) to Byte #N are unused (Reserved). That is, among the parameters related to the display capability (transmission format and display method) of the display device 200, the 3D display possibility (3D Capable), 3D display method (3D image), and 3D transmission format (3D format). Each parameter is assigned to a predetermined position (3D_X) in the 3D field and stored in the EDID_ROM 213 as EDID information.

  Next, an AVI info frame (AVI infoFrame) transmitted by being superimposed on the video blanking period will be described.

  FIG. 12 is a diagram for explaining the format of the AVI info frame, and shows the format of the vendor info frame (HDMI Vender Specific infoFrame). 12A shows the configuration of the vendor info frame packet header (HDMI Vender Specific InfoFrame Packet Header), and FIG. 12B shows the configuration of the vendor info frame packet content (HDMI Vender Specific Info Packet Content). .

  First, in the packet header Byte # HB0, a packet type (Packet Type) = 0X81 is described in order to declare that the information frame is unique to the vendor, and in the Byte # HB1, a version number (0X01) is described. . Also, the payload length (Nv) of the vendor info frame is described using 5 bits of Bit # 4 to Bit # 0 of Byte # HB2.

  The vendor ID registered in IEEE is described in 3 bytes of Byte # PB0 to Byte # PB2 of the packet content. Data (3D_7 to 3D_0) is described in Byte # PB3 (data area), and Byte # PB4 to Byte # PB (Nv-4) are reserved (0). That is, each parameter of the transmission format of the 3D video in FIG. 6 is described in this data area.

  In the above description, the data area has been described as 1 byte (Byte # PB3) because it is assumed that all parameters of the transmission format shown in FIG. 6 are transmitted with one code. The data area is not limited to this. For example, when all the parameters of the transmission format shown in FIG. 6 are transmitted, a data area necessary for the data area can be secured.

  A part of the information of the transmission format shown in FIG. 6 can also be sent via the CEC channel.

  FIG. 13 is a diagram for explaining the CEC format, and shows a format for transmitting various parameters of the B group in FIG. 3 through the CEC channel. In CEC, information is transmitted as a message. FIG. 13A shows a packet structure of a CEC frame (CEC frame) constituting a message, and FIG. 13B shows an example of a CEC frame for sending various parameters of group B in FIG.

  In FIG. 13A, a CEC frame is composed of a header block and a data block 1 to a data block N (data block 1 to data block N) (N = 1 to 13). In the header block, a 4-bit sender address and a destination address are described. Each data block includes 1-byte information (Information), a command is sent in the data block 1, and an argument (parameter) is transmitted in the data block 2 and later. Further, 1-bit EOM (End of Message) is added to all the blocks, and indicates whether this block is followed by a block (0) or the message ends (1) in this block. Similarly, it includes 1-bit ACK (Acknowledge), the sender sends ACK to 1, and the receiver sends ACK to 0 if it is a message addressed to itself. .

  In CEC, a vendor-specific message for a vendor command (Vender Command) is prepared, and each vendor can exchange a vendor-specific command and argument between devices using this message.

  A method of transmitting the parameters of the B group in FIG. 3 using the CEC vendor command will be described. In FIG. 13B, a value of “0XA0” indicating a vendor command with ID (vender command with ID) is sent following the header block (header block), and the vendor ID (Vender ID) is sent in the next three blocks. Send. Thereafter, vendor-specific data (Vender Specific data) is sent. The first block of vendor-specific data is a vendor-defined command (Vender Command) followed by a data block. Since one CEC message has a maximum of 14 blocks, 11 blocks (11 bytes) can be transmitted as vendor-specific data. In this embodiment, a command related to 3D video is defined as the vendor definition command, and the parameters of group B in FIG. 3 are sent using this command.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 14 is a diagram illustrating a configuration example of the stereoscopic video transmission system 2 in the present embodiment. The 3D video transmission system 2 according to the present embodiment is different from the first embodiment in that the video output device is changed from the recording / reproducing device 100 to the tuner 300. Since the other components are the same, the same components are denoted by the same reference numerals and description thereof is omitted.

  A tuner 300 as a video receiving apparatus includes a receiving unit 305, a format converting unit 304, and an HDMI transmitting unit 310, and is connected to an antenna 301, a coaxial cable 302, and the Internet 303. A 3D video broadcast from a broadcast station (not shown) is received in a predetermined reception format by a receiving unit 305 serving as a video acquisition unit via an antenna 301. The received 3D video is converted into a receivable transmission format of the display device 200 acquired in advance by the format conversion unit 304 and output to the display device 200 via the HDMI transmission unit 310.

  3D video broadcast from a cable broadcasting station (cable station; not shown) passes through the coaxial cable 302, and 3D video from a program distribution server (not shown) corresponding to an IP (Internet Protocol) network passes through the Internet 303. And input to the receiving unit 305. The format conversion unit 304 performs conversion corresponding to the reception format of the 3D video received from the antenna 301, the coaxial cable 302, and the Internet 303. Since the subsequent operation is the same as that of the first embodiment, description thereof is omitted.

  As described above, according to the 3D video transmission system 2 of the present embodiment, 3D video images of various formats sent from the outside such as homes are transmitted to the display device 200 by the tuner 300 having the HDMI terminal. It is possible to display.

  As described above, according to the present invention, in a 3D video transmission system including a video output device and a display device connected via HDMI, 3D video is transmitted and displayed between the video output device and the display device. It is possible to transmit various parameters. Thus, even when a plurality of display devices having different display capabilities are connected to the 3D video transmission system, 3D video data can be transmitted without any problem.

  In the above embodiment, the recording / reproducing apparatus 100 has been described as a DVD recorder. However, the present invention is not limited to this and may be a BD recorder, an HDD (hard disk drive) recorder, or the like.

  In the above embodiment, the case where the video output device and the display device are connected by the HDMI cable compliant with the HDMI standard has been described. However, the connection between the devices may be performed wirelessly. The present invention can be applied if the wireless communication system is compatible with the HDMI protocol. At this time, the 3D video data to be transmitted is not limited to the baseband video data, and may be compressed video data.

  Further, although the above embodiment has been described on the premise of the HDMI standard, other transmission methods may be used as long as various parameters representing the display capability of the display device described in this embodiment can be exchanged between devices.

  The present invention can be widely used in systems that transmit and receive stereoscopic video data between devices connected by HDMI.

DESCRIPTION OF SYMBOLS 100 Recording / reproducing apparatus 101 Optical disk 102 Recording / reproducing part 103 Codec 104,204,304 Format conversion part 110,310 HDMI transmission part 111 TMDS encoder 112,212 Packet processing part 200 Display apparatus 201 Display control part 202 Display panel 210 HDMI receiving part 211 TMDS decoder 213 EDID ROM
300 Tuner 301 Antenna 302 Coaxial Cable 303 Internet 305 Receiver

Claims (6)

A video output device for outputting a video signal,
A format conversion unit that converts the format of the video signal output from the video output device according to the reception capability of the video input device that inputs and processes the video signal;
An HDMI transmission unit that outputs the video signal converted by the format conversion unit through an interface compliant with the HDMI standard;
When the format of the video signal to be output is a stereoscopic video signal, the format conversion unit is configured to perform vertical comparison between two related video signals constituting the stereoscopic video signal and one of the two video signals. Generating a vertical synchronization signal in which the signal width of the vertical synchronization signal output as synchronization and the signal width of the vertical synchronization signal output as vertical synchronization of the other video signal are different.
Video output device. A video input device that processes a video signal input from a video output device and a vertical synchronization signal,
An EDID storage unit that holds information of a video signal format that can be processed by the video input device;
When the processable video signal held in the EDID storage unit is a stereoscopic video signal, vertical synchronization of two related video signals constituting the stereoscopic video signal and one video signal of the two video signals An HDMI receiver that receives a vertical synchronization signal having a different signal width of a vertical synchronization signal as a vertical synchronization signal as a vertical synchronization of the other video signal with an interface conforming to the HDMI standard;
A video input device comprising: An output control method for a video output device that outputs a video signal,
A format conversion step for converting the format of the video signal output from the video output device according to the reception capability of the video input device that inputs and processes the video signal;
An HDMI transmission step for outputting the video signal converted by the format conversion step through an interface compliant with the HDMI standard;
In the format conversion step, when the format of the video signal to be output is a stereoscopic video signal, two related video signals constituting the stereoscopic video signal and one video signal of the two video signals are perpendicular to each other. Generating a vertical synchronization signal in which the signal width of the vertical synchronization signal output as synchronization and the signal width of the vertical synchronization signal output as vertical synchronization of the other video signal are different.
Output control method for video output device. An input control method for a video input device that processes a video signal and a vertical synchronization signal input from the video output device,
Transmitting information on a video signal format that can be processed by the video input device recorded in an EDID storage unit to a video output device that outputs a video signal;
When the video signal transmitted from the video output device based on the video signal format information transmitted to the video output device is a stereoscopic video signal, two related video signals constituting the stereoscopic video signal; An interface that conforms to the HDMI standard and has a vertical synchronization signal that is different in signal width from the vertical synchronization signal as the vertical synchronization of one video signal and the vertical synchronization signal as the vertical synchronization of the other video signal. HDMI receiving step for receiving at
An input control method for a video input device comprising: A video transmission system comprising: a video output device that outputs a video signal; and a video input device that processes the video signal as an input,
The video input device
An EDID storage unit that holds information of a video signal format that can be processed by the video input device;
An HDMI receiver that receives the video signal output from the video output device via an interface conforming to the HDMI standard;
With
The video output device
When the information of the video signal format that can be processed by the video input device stored in the EDID storage unit indicates a stereoscopic video signal, two related video signals constituting the stereoscopic video signal, and the 2 Generating a vertical synchronization signal in which a signal width of a vertical synchronization signal output as vertical synchronization of one video signal is different from a signal width of a vertical synchronization signal output as vertical synchronization of the other video signal; A format converter,
An HDMI transmission unit that transmits the video signal generated by the format conversion unit to the video input device through an interface compliant with the HDMI standard;
A video transmission system comprising: A video transmission method for transmitting the video signal from a video output device that outputs the video signal to a video input device that processes the video signal as an input,
An information transmission step of transmitting information in a video signal format that can be processed by the video input device to the video output device;
When the information of the video signal format that can be processed by the video input device is a stereoscopic video signal, the stereoscopic video signal is divided into two related video signals that constitute the stereoscopic video signal and one of the two video signals. A conversion step for converting into a vertical synchronization signal in which the signal width of the vertical synchronization signal output as the vertical synchronization of the video signal is different from the signal width of the vertical synchronization signal output as the vertical synchronization of the other video signal;
A transmission step of transmitting the converted video signal from the video output device to the video input device using an interface conforming to the HDMI standard;
A video transmission method comprising:

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