JP3732916B2 - Digital broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital broadcast receiver, and more particularly to a digital broadcast receiver that can properly format received image data corresponding to a 3D broadcast system and display it in 3D playback.
[0002]
[Prior art]
Conventionally, as an example of a digital broadcasting system, there is a digital broadcasting system using a 525p progressive scanning method (hereinafter referred to as a non-interlaced digital broadcasting system).
[0003]
For such a non-interlaced digital broadcasting system, for example, "525 sequential scanning" by Urano et al. On pages 25 to 30 of the Television Society Technical Report Vol. 20 No. 13 published on February 27, 1996. Details are shown in “Development of CS Digital Broadcasting System for Signals”, and detailed description thereof is omitted here. The non-interlaced digital broadcasting system provides a broadcasting service using image data compatible with a non-interlaced scanning system, which is different from the current interlaced scanning system (NTSC).
[0004]
Further, a digital 3D broadcasting system for providing 3D broadcasting service using this non-interlaced digital broadcasting system has been proposed by the applicant of the present application (Japanese Patent Application No. 08-326721), but is not yet known. This proposed digital stereoscopic broadcasting system converts a total of two fields of image data for the right eye and left eye corresponding to the interlace scanning method into one frame of image data corresponding to the non-interlace scanning method. Image data is transmitted using a transmission path, and this is intended to be displayed in 3D.
[0005]
[Problems to be solved by the invention]
That is, from the transmission side of the conventional digital stereoscopic broadcasting system proposed as described above, one-channel image data including right-eye and left-eye image data corresponding to odd fields, and right-eye corresponding to even fields and One-channel image data including image data for the left eye is alternately transmitted.
[0006]
On the other hand, on the receiving side of such a digital 3D broadcasting system, the received 1-channel image data is returned to 2-channel interlaced scanning-compatible image data (for the right eye and for the left eye). Each is formatted and played back.
[0007]
However, on the receiving side of the proposed digital stereoscopic broadcasting system as described above, there is no function for determining whether the image to be formatted corresponds to an odd field or an even field.
[0008]
Therefore, the image data corresponding to the odd field (or even field) is regarded as the image data corresponding to the even field (odd field) and formatted. As a result, the receiver of the proposed digital 3D broadcasting system has a problem that odd fields and even fields are interchanged and there is a high probability of being reproduced and displayed.
[0009]
Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a digital broadcast receiver capable of appropriately formatting, reproducing and displaying image data corresponding to a one-channel stereoscopic broadcasting system. There is to do.
[0010]
[Means for Solving the Problems]
The digital broadcast receiver according to claim 1 associates an interlaced right-eye field video signal and an interlaced left-eye field video signal that are synchronized with each other for each corresponding even field and each corresponding odd field. In a digital broadcast receiver of a digital broadcast system that is converted into non-interlaced one-channel frame image data and transmitted alternately, the received image data includes intra-frame encoded image data and The GOP image data corresponding to the odd field, which is composed of GOP image data with the GOP structure as a unit of the GOP structure arranged in a predetermined order in the time axis direction and is reproduced and displayed first when decoded. Or any one of GOP image data corresponding to even field And the beginning of one, by GOP start code and is appended, receiving means for demodulating the received image data, which receives the image data to which the demodulated to obtain the GOP start code, the GOP image Separating means for separating and outputting data as a unit, decoding means for decoding the separated GOP image data, and corresponding to odd or even predetermined fields constituting the head of the decoded GOP image data A synchronization signal corresponding to the predetermined field is added to the GOP image data and output, and a synchronization signal corresponding to an odd or even field different from the predetermined field is added to the subsequent GOP image data and output. Similarly, the synchronization signal corresponding to the odd or even field is applied to the subsequent GOP image data. And an output formatting means for outputting mutually added to.
[0012]
A digital broadcast receiver according to a second aspect is the digital broadcast receiver according to the first aspect, wherein the number of image data included in the GOP image data is an even number.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
The first embodiment of the present invention enables a digital broadcast receiver to appropriately format and stereoscopically display received image data corresponding to a one-channel stereoscopic broadcasting system.
[0014]
The digital broadcast receiver according to the first embodiment of the present invention receives, as an input, image data corresponding to a one-channel stereoscopic broadcasting system, which is encoded according to a predetermined rule, and reproduces and displays it.
[0015]
FIG. 1 is a diagram showing an example of a screen configuration of image data corresponding to a stereoscopic broadcast system received by the digital broadcast receiver 100 according to Embodiment 1 of the present invention.
[0016]
Referring to FIG. 1, the image data screen corresponding to the stereoscopic broadcasting system has a standard non-interlace scanning system screen configuration of 704 horizontal pixels (I = 1 to 704) × vertical pixel count. It corresponds to 480 pixels (J = 1 to 480).
[0017]
Further, the screen of image data corresponding to the 3D broadcasting system is composed of two blocks B1 and B2. One of the blocks B1 and B2 is a screen of image data for the right eye acquired by the interlace scanning method, and the other is a screen of image data for the left eye acquired by the interlace scanning method (hereinafter, for the sake of simplicity). It is assumed that block B1 corresponds to the right eye and block B2 corresponds to the left eye).
[0018]
Furthermore, the image data corresponding to the stereoscopic broadcasting system is a frame image including image data of two screens (for right eye and left eye) corresponding to odd fields, or an image of two screens (for right eye and left eyes) corresponding to even fields. It is classified into frame images containing data.
[0019]
The configuration and operation of the image data generation device 300 that generates such image data compatible with the 3D broadcasting system will be described.
[0020]
FIG. 2 is a block diagram schematically showing an example of the basic configuration of the image data generation device 300. Referring to FIG. 2, the image data generation device 300 includes interlace scanning type cameras 21 a and 21 b and a frame memory device 20.
[0021]
The frame memory device 20 converts the two-field image received from each of the cameras 21a and 21b into image data (see FIG. 1) corresponding to a one-dimensional stereoscopic broadcasting system, and outputs the image data.
[0022]
Specifically, the frame memory device 20 includes two field memories (not shown), writes the image data R for the right eye received from the camera 21a to one field memory, and the image data L for the left eye received from the camera 21b. To the other field memory. Then, the right-eye image data R and the left-eye image data L are read from each field memory at twice the writing speed, thereby generating image data corresponding to the stereoscopic broadcasting system.
[0023]
FIGS. 3A and 3B are schematic diagrams for explaining the operation of the frame memory device 20 of the image data generating apparatus 300. FIGS. 3A and 3B show the screen configuration of the image for the right eye, respectively. An example of the screen configuration of the image for the left eye is shown, and FIG. 3C shows the screen configuration of the image data output from the frame memory device 20.
[0024]
3A and 3B, the effective pixel number of the screen corresponding to the image data R for the right eye and the image data L for the left eye is set to 704 pixels in the horizontal direction (horizontal pixel number I: I = 1 to 704) × vertical number of pixels 240 pixels (vertical direction pixel number J: J = 1 to 240), and the horizontal synchronization frequency FH of the right-eye image data R and the left-eye image data L is 15.75 kHz, The vertical synchronization frequency FR is set to 59.94 Hz.
[0025]
In this case, if the writing frequency to the field memory is FH and the reading frequency is (2 × FH), the frame memory device 20 has the horizontal synchronization frequency of 31.5 kHz and the vertical synchronization composed of the screen configuration described in FIG. Image data (FIG. 3C) having a frequency of 59.94 Hz is generated.
[0026]
Based on the above operation, the frame memory device 20 alternately generates image data including right-eye and left-eye images corresponding to odd fields and image data including right-eye and left-eye images corresponding to even fields ( Original image) and output.
[0027]
Next, an example of the configuration and operation of the digital encoding device 200 that encodes such image data compatible with the stereoscopic broadcasting system according to a predetermined rule will be described.
[0028]
FIG. 4 is a block diagram schematically showing an example of the basic configuration of the digital encoding device 200 and peripheral circuits. Referring to FIG. 4, the digital encoding device 200 includes a video source unit 40, a delay device 41, a switch 42, an encoder circuit 44, and a field determination circuit 43.
[0029]
Referring to FIG. 4, video source section 40 includes a recording / reproducing device 29 that can record and reproduce image data corresponding to a 3D broadcasting system including information for two screens shown in FIG. 1 in one screen. . For example, by connecting the recording / reproducing device 29 to the output side of the image data generating device 300 described above, the image data corresponding to the stereoscopic broadcasting method generated by the image data generating device 300 is recorded in advance.
[0030]
The delay device 41 outputs the image data input from the video source unit 40 while shifting it by one frame (screen). For example, when the video source unit 40 outputs the kth image data corresponding to the odd field, the delay device 41 outputs the (k−1) th image data corresponding to the even field. Further, when the video source unit 40 outputs the (k + 1) th image data corresponding to the even field, the delay device 41 outputs the kth image data corresponding to the odd field.
[0031]
The switch 42 outputs image data received from either the data video source unit 40 or the delay device 41 based on the control of the field discrimination circuit 43 described later.
[0032]
The encoder circuit 44 complies with the MPEG standard and encodes the image data output from the switch 42 according to the GOP structure.
[0033]
Here, encoding in the encoder circuit 44 will be briefly described. In encoding, an image is divided into an I picture (Intra-Picture: intra-frame encoded image), a P picture (Predictive-Picture: intra-frame forward prediction encoded image), and a B picture (Bidirectional-Picture: bidirectional prediction). (Encoded image).
[0034]
An I picture is an image that is encoded and decoded in an image, and a P picture is encoded and decoded by referring to a reference image (I picture or P picture) existing in the past closest in time order. Further, the B picture is an image that is encoded and decoded by referring to an image existing in the past closest in time order and a reference image existing in the closest future.
[0035]
FIG. 5 is a diagram for explaining the relationship between an I picture, a P picture, and a B picture based on the MPEG standard, and shows a sequence of images that are temporally continuous.
[0036]
In FIG. 5, I2 indicates an I picture, P5, P8, and P11 indicate P pictures, and B0, B1, B3, B4, B6, B7, B9, and B10 indicate B pictures, respectively.
[0037]
The arrow in the figure indicates that the image corresponding to the end point of the arrow refers to the image corresponding to the start point of the arrow. In FIG. 5, I2, which is an I picture, is encoded within the I2 picture, and the P picture and the B picture shown in FIG. 5 directly or indirectly refer to the I2 picture. For this reason, P picture and B picture cannot be encoded unless the I2 picture is encoded first. A plurality of images having such a reference relationship is called a GOP (Group of Pictures).
[0038]
In the following description, the GOP structure consisting of 12 screens shown in FIG. 5 will be used as an example, and the top image data is an I2 picture. Is called GOP image data.
[0039]
Referring to FIG. 4, field discriminating circuit 43 receives GOP image data output from encoder circuit 44, discriminates GOP image data, and controls switch 42 according to the discrimination result. Specifically, when the received GOP image data is decoded, it is determined whether or not the first image to be reproduced and displayed is image data corresponding to an odd field. If it is determined that the image data does not correspond to the odd field, the switch 42 is controlled to switch the image data input to the encoder circuit 44.
[0040]
Here, for reference, the relationship between the sequence of original images, the sequence of encoded images, and the sequence of images that are decoded and reproduced and displayed will be described.
[0041]
FIG. 6 is a diagram for explaining the arrangement of the original images, the arrangement of the encoded images, and the arrangement of the images that are decoded and reproduced and displayed. 6A shows an arrangement of image data in the original image, FIG. 6B shows an arrangement of encoded image data, and FIG. 6C shows an arrangement of image data to be reproduced and displayed. Each is shown. Referring to FIG. 6, it is assumed that an I picture, a P picture, and a B picture are assigned to the image data string of the original image as shown in FIG.
[0042]
In the encoding process, as described above, the B picture is skipped, the I picture and the P picture, which are reference images, are encoded, and then the B picture located between the reference screens is encoded.
[0043]
On the other hand, in the decoding process, the reference image is decoded, but the decoded reference image is not reproduced and displayed until the decoding of the B picture located between the reference images is completed. On the other hand, the decoded B picture is immediately reproduced and displayed.
[0044]
As a result, as shown in FIG. 6, the arrangement of the original image, the encoded image, and the reproduced image is different from each other.
[0045]
Referring to FIG. 4, switch 42 switches the input received from video source unit 40 to the input from delay device 41 under the control of field discrimination circuit 43, or receives the input received from delay device 41. Switch to input from video source 40. As a result, the input to the encoder circuit 44 is shifted by one frame, and the encoding timing is switched.
[0046]
As a result, when the GOP image data output to the outside from the encoder circuit 44 of the digital encoding device 200 is decoded and reproduced and displayed, even if the replacement described with reference to FIG. The image data always corresponds to the odd field.
[0047]
As shown in FIG. 4, the GOP image data is transmitted to the outside by connecting the output of the encoder circuit 44 of the digital encoding device 200 to the transmission device 45. As an example of the transmission form, a communication satellite device is provided and transmitted by the communication satellite.
[0048]
Further, the digital encoding device 200 may be configured to directly connect the image data generation device 300 in place of the video source unit 40.
[0049]
Next, the configuration and operation of the digital broadcast receiver 100 according to the first embodiment of the present invention that receives and reproduces the image data corresponding to the stereoscopic broadcast system encoded by the above procedure will be described.
[0050]
FIG. 7 is a block diagram schematically showing an example of the basic configuration of the digital broadcast receiver 100 according to Embodiment 1 of the present invention. Referring to FIG. 7, digital broadcast receiver 100 includes a receiving circuit 1, a GOP separating circuit 2, a decoding circuit 3, a frame memory 4, an output signal formatting circuit 5, and a CPU 6.
[0051]
The digital broadcast receiver 100 receives one-channel image data (FIG. 1) received by the antenna 12 as an input. The receiving circuit 1 includes a tuner and a digital demodulating circuit (not shown), and digitally demodulates received image data.
[0052]
The GOP separation circuit 2 receives the output of the reception circuit 1 and separates GOP image data having the GOP structure shown in FIG. 5 as a unit. Specifically, the GOP image data is separated and output by obtaining a GOP start code added to the head of the GOP image data.
[0053]
The decode circuit 3 decodes the GOP image data, and the frame memory 4 stores the frame data output from the decode circuit 3. The order of the frame data stored in the frame memory 4 corresponds to the order of the reproduced images shown in FIG. Therefore, the top of the frame data, that is, the top image to be reproduced and displayed is a frame image corresponding to the odd field according to the agreement with the digital encoding device 200.
[0054]
The output signal format circuit 5 uses the frame data stored in the frame memory 4 and formats it to generate an output signal. The output signal is sent to a monitor located at a later stage (not shown).
[0055]
The CPU 6 controls each component circuit.
FIG. 8 is a flowchart showing the procedure of the format process in digital broadcast receiver 100 according to the first embodiment of the present invention.
[0056]
The GOP separation circuit 2 acquires a GOP start code (step s1).
When the GOP start code is acquired, the decoding circuit 3 starts decoding the GOP image data (step s2).
[0057]
In this case, as described above, the head of the frame data stored in the frame memory 4 corresponds to the image corresponding to the odd field according to the encoding rule.
[0058]
The output signal format circuit 5 receives the first frame data stored in the frame memory 4, divides it into blocks B1 and B2, adds a synchronization signal corresponding to the odd field, and outputs it (step s3).
[0059]
Further, the output signal format circuit 5 divides the subsequent frame data into two parts, adds a synchronization signal corresponding to the even field, and outputs it (step s4).
[0060]
Further, the output signal format circuit 5 receives the subsequent frame data, divides it into two, adds a synchronization signal signal corresponding to the odd field, and outputs it (step s5).
[0061]
The output signal format circuit 5 repeats steps s4 and s5 below.
That is, the digital broadcast receiver 100 according to Embodiment 1 of the present invention can appropriately format the odd field and even field of the received image data according to the agreement with the transmission side.
[0062]
FIG. 9 is a diagram showing the status of the image data format in the digital broadcast receiver 100 according to Embodiment 1 of the present invention. FIG. 9A shows the screen of the input image data and the vertical synchronization signal. FIG. 9B shows the relationship between the screen of the image data after the format process and the vertical synchronization signal. 9 correspond to the image for the right eye, and the symbols L1, L2,... In FIG. 9 correspond to the image for the left eye. In addition, symbols O and E in FIG. 9 represent an odd field and an even field, respectively. By following the above-mentioned rules, (R1, L1), (R3, L3),... Correspond to odd fields, and (R2, L2), (R4, L4),. .
[0063]
Referring to FIG. 9, for image data including image information for two screens (FIG. 9A), output signal format circuit 5 sequentially follows image data corresponding to odd fields (R1, L1). , R3, L3,..., A vertical synchronization signal corresponding to an odd field, and a vertical synchronization signal corresponding to an even field to image data corresponding to an even field (R2, L2, R4, R4,...). Can do.
[0064]
In the present embodiment, the head image is described as corresponding to the odd field image, but may be associated with the even field.
[0065]
Also, the GOP structure is not limited to that shown in FIG. 5, and a GOP structure including an even number of images is sufficient.
[0066]
As shown in FIG. 7, the digital broadcast receiver 100 is not limited to the input from the antenna 12, and the recording / reproducing device 9 is connected to the decoding circuit 3, and the image data encoded according to the agreement is recorded on the recording / reproducing device 9. Alternatively, the data decoded by the decoding circuit 3 may be recorded in the recording / reproducing apparatus 9.
[0067]
Specific examples of the recording / reproducing devices 9 and 29 include a personal computer hard disk, DVD, DVD-RAM, D-VTR, MD, and magneto-optical disk.
[0068]
【The invention's effect】
As described above, according to the digital broadcast receiver of the present invention, by decoding the received image according to the agreement with the transmission side, the sequentially received image data corresponding to the three-dimensional broadcast system is compatible with the odd field. It is possible to determine whether the image data is image data corresponding to an even field or not.
[0069]
Further, according to the digital broadcast receiver of the present invention, it is possible to appropriately format and reproduce and display by using the determined result.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a screen configuration of image data received by a digital broadcast receiver according to a first embodiment of the present invention.
FIG. 2 is a block diagram schematically showing an example of a basic configuration of an image data generation device 300 according to Embodiment 1 of the present invention.
FIG. 3 is a diagram for explaining an operation of the frame memory device 20 of the image data generation device 300;
4 is a block diagram schematically showing an example of a basic configuration of a digital encoding device 200 and peripheral circuits according to the first embodiment of the present invention. FIG.
FIG. 5 is a diagram for explaining the relationship between an I picture, a P picture, and a B picture based on the MPEG standard.
FIG. 6 is a diagram for explaining an arrangement of original images, an arrangement of encoded images, and an arrangement of images that are decoded and reproduced and displayed.
7 is a block diagram schematically showing an example of a basic configuration of a digital broadcast receiver 100 according to the first embodiment of the present invention. FIG.
FIG. 8 is a flowchart showing a procedure of format processing of the digital broadcast receiver 100 according to Embodiment 1 of the present invention.
FIG. 9 is a diagram showing the state of the format of image data in digital broadcast receiver 100 according to the first embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reception circuit 2 GOP separation circuit 3 Decoding circuit 4 Frame memory 5 Output signal format circuit 6 CPU
9, 29 Recording / reproducing device 12 Antenna 20 Frame memory device 21a, 21b Interlaced scanning system compatible camera 40 Video source unit 41 Delay device 42 Switch 43 Field discrimination circuit 44 Encoder circuit 45 Transmission device 100 Digital broadcast receiver 200 Digital encoding device 300 Image data generator

Claims (2)

Interlaced right-eye field video signals and interlaced left-eye field video signals that are synchronized with each other and multiplexed in correspondence with each corresponding even field and each corresponding odd field. In a digital broadcast receiver of a digital broadcast system that is converted into frame image data of one channel and transmitted alternately,
The received image data is composed of GOP image data with a GOP structure as a unit in which the intra-frame encoded image data and the predicted encoded image data are arranged in a predetermined order in the time axis direction , and when decoded, A GOP start code is added to the head of one of the GOP image data corresponding to the odd field or the GOP image data corresponding to the even field, which is reproduced and displayed first ,
A receiving means for demodulating said received image data,
Separating means for receiving the demodulated image data and obtaining the GOP start code to separate and output the GOP image data as a unit;
Decoding means for decoding the separated GOP image data ;
A sync signal corresponding to the predetermined field is added to the odd or even GOP image data corresponding to the predetermined field , which forms the head of the decoded GOP image data, and the subsequent GOP image data is output. Outputs by adding a synchronization signal corresponding to an odd or even field different from the predetermined field, and further outputting a synchronization signal corresponding to an odd or even field alternately to the subsequent GOP image data. A digital broadcast receiver comprising: formatting means; The digital broadcast receiver according to claim 1, wherein the number of the image data included in the GOP image data is an even number.

Images