JP2014175945A - Video accumulation device, video accumulation reproduction device, video accumulation method, and video accumulation reproduction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable two video signals differing in encoding parameter to be encoded after achieving the downsizing of a device.SOLUTION: A video accumulation device according to an embodiment comprises a buffer, an encoder, a control unit, and a parameter setting unit. The buffer stores a first video signal and a second video signal. The encoder, designed to operate at a double speed which is an integral multiple of a reproduction speed needed for reproducing one frame of video, encodes output of this buffer using a set encoding parameter and outputs the encoded data to the accumulation unit. The control unit reads out and outputs the first video signal and the second video signal stored in the buffer alternately for each frame at the double speed. The parameter setting unit, provided in the encoder, acquires, and sets for the encoder, an encoding parameter corresponding to the first video signal when the first video signal is encoded by the encoder, and acquires, and sets for the encoder, an encoding parameter corresponding to the second video signal when the encoding of the first video signal terminates.

Description

  Embodiments described herein relate generally to a video storage device, a video storage / playback device, a video storage method, and a video storage / playback method that encode two video signals having different encoding parameters, such as a video signal and a key signal, and store them in a storage device.

  As is well known, in a video editing system, a video synthesis technique is used in which a character video signal such as a character or a person is extracted from a video signal and this character video is synthesized with another background image. In this video composition technology, in order to superimpose additional information (provider company name, program name) on the video signal, a method of extracting the additional information area from the luminance / color component of the additional information signal and superimposing it on the video signal Is adopted. In the video composition technique, an area signal (key signal) for smoothing the edge portion of the synthesized video is used so that the edge portion of the synthesized video does not appear unnatural.

  In a VAF (Video Audio File) server used in a broadcast station, video signals, audio signals, and key signals are simultaneously encoded by encoders and temporarily stored in an accumulator, and an automatic program transmission control device (APC). The corresponding video signal, audio signal, and key signal are reproduced in accordance with an instruction from, and on-air is performed.

  By the way, the key signal includes only a luminance signal and does not include a color signal. Moreover, even if the compression rate is increased, it is difficult to understand the deterioration. Therefore, it is considered that the encoding parameters for encoding are changed between the video signal and the key signal. For example, if Vy is the code amount of the video luminance signal, Vc is the code amount of the video color signal, Ky is the code amount of the key luminance signal, and Kc is the code amount of the key color signal, for example, Vy: Vc: Ky: If the allocation is performed at a ratio of Kc = 2: 1: 1: 0, the total amount of codes can be reduced, and the accumulation time can be extended.

JP 2005-64575 A

  By the way, the VAF server requires separate encoders / decoders for video signals and key signals, which increases the scale of the entire apparatus.

  An object of the present invention is to provide a video storage device, a video storage / playback device, a video storage method, and a video storage / playback method capable of encoding two video signals having different encoding parameters while reducing the size of the device. It is in.

  According to the embodiment, the video storage device is intended for a video storage device that encodes a first video signal and a second video signal, which have different encoding parameters necessary for encoding, and stores them in the storage unit. A buffer, an encoder, a control unit, and a parameter setting unit. The buffer stores the first video signal and the second video signal. The encoder operates at a speed that is an integral multiple of the playback speed required to play back one frame of video, and encodes the output of this buffer with the set coding parameter and outputs the encoded data to the storage unit. The control unit alternately reads and outputs the first video signal and the second video signal stored in the buffer for each frame at a double speed. The parameter setting unit is provided in the encoder, acquires an encoding parameter corresponding to the first video signal when the encoder encodes the first video signal, sets the parameter in the encoder, and ends encoding of the first video signal Sometimes an encoding parameter corresponding to the second video signal is acquired and set in the encoder.

1 is a block diagram showing a configuration of a video storage / playback apparatus according to a first embodiment. FIG. 3 is a timing diagram of video signals and key signals handled in the first embodiment. The flowchart which shows the control processing procedure of the control part at the time of recording in the 1st embodiment. 6 is a flowchart illustrating a control processing procedure of a control unit during reproduction according to the first embodiment. The block diagram which shows the structure of the image | video storage / reproducing apparatus which concerns on 2nd Embodiment. The block diagram which shows the comparative example of an image | video storage / reproducing apparatus.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing the configuration of the video storage / playback apparatus according to the first embodiment.

  In this video storage / playback apparatus, video signals, key signals, and audio signals with different encoding parameters are input, and the video signals and key signals are stored in the first buffer 11. The first buffer 11 is read and controlled by the control unit 12 at twice the normal reproduction speed, and alternately outputs the video signal and the key signal for each frame. The video signal and the key signal output from the first buffer 11 are encoded by an encoder 13 that operates at a double speed together with the audio signal, such as Vy: Vc = 2: 1, Ky: Kc = 1: 0, and an image format. It is encoded according to the parameters and recorded in the storage device 14.

  The control unit 12 issues a write instruction and a read instruction to the first buffer 11. In addition, the control unit 12 includes a parameter generation unit 121. The parameter generation unit 121 generates a video signal encoding parameter (for example, Vy: Vc = 2: 1) to the encoder 13 when the first buffer 11 is reading a video signal, and outputs a key signal. When reading, an encoding parameter for a key signal (for example, Ky: Kc = 1: 0) is generated. Further, the control unit 12 sets recording information for the storage device 14.

  Meanwhile, the encoder 13 is provided with a parameter setting unit 131. The parameter setting unit 131 obtains the encoding parameter corresponding to the video signal from the control unit 12 when the video signal is encoded by the encoder 13 and sets the encoding parameter in the encoder 13. The controller 12 is notified, and the encoding parameter corresponding to the key signal is acquired from the controller 12 and set in the encoder 13.

  At the time of reproduction, the control unit 12 instructs the storage device 14 to start recording by specifying recording information. Data output from the storage device at double speed is decoded into a video / audio / key signal by the decoder 15 operating at double speed, and the video / key signal is stored in the second buffer 16. The control unit 12 issues a write instruction and a read instruction so that the video / key signal is written to the second buffer 16 at a double speed and read at a normal speed. Then, the second buffer 16 reads and outputs the video signal and the key signal in parallel.

Next, the operation in the above configuration will be described with reference to FIG.
The video signal shown in FIG. 2A and the key signal shown in FIG. 2B are input and stored in the first buffer 11.

  On the other hand, when receiving a recording instruction from a host system (not shown), the control unit 12 starts a control processing procedure shown in FIG. First, the control unit 12 reads a video signal from the first buffer 11 at double speed (step ST3a), generates a video encoding parameter shown in FIG. 2C, and sends it to the encoder 13 (step ST3b). ). Then, the control unit 12 monitors whether or not the encoding end of the video signal (video 1) for one frame is notified from the encoder 13 (step ST3c), and notifies the encoding end. If yes (Yes), the key signal is read from the first buffer 11 at double speed (step ST3d), and the key encoding parameters shown in FIG. 2C are generated and sent to the encoder 13 (step ST3d). ST3e).

  Thereafter, the control unit 12 monitors whether or not the encoding end of the key signal (key 1) for one frame is notified from the encoder 13 (step ST3f), and notifies the end of encoding. If yes (Yes), the process proceeds to the process of step ST3a, and the processes of step ST3a to step ST3f are repeatedly executed for the video signal (video 2) after the next frame.

  Then, the encoded data shown in FIG. 2D is output from the encoder 13 and stored in the storage device 14. That is, the encoder 13 vacates the generation time of the video encoding data (video 1 encoding), the video encoding parameter, and the key encoding parameter within one frame (about 33 ms) period of the video signal. Key-encoded data (key 1 encoding).

  Further, when receiving a reproduction instruction from a host system (not shown), the control unit 12 starts a control processing procedure shown in FIG. First, the control unit 12 reads out the video encoded data (video 1 encoding) from the storage device 14 at double speed and outputs it to the decoder 15 (step ST4a), and then the video encoded data (video 1 code) from the decoder 15. It is monitored whether or not the completion of decoding is notified (step ST4b). When the end of decoding is notified (Yes), the key encoded data (key 1 encoded) is read from the storage device 14 at double speed and output to the decoder 15 (step ST4c). It is monitored whether or not the end of decoding of the encoded data (key 1 encoding) is notified (step ST4d). When notification of the end of decoding is received (Yes), the control unit 12 proceeds to the process of step ST4a, and the above steps ST4a to ST4a are also performed for video encoded data (video 2 encoding) after the next frame. The process of step ST4d is repeatedly executed.

  Then, the video / key signal shown in FIG. 2E is output from the decoder 15 and stored in the second buffer 16.

  Thereafter, the control unit 12 reads out and outputs the video / key signal stored in the second buffer 16 at a normal reproduction speed. As a result, the output of the second buffer 16 is as shown in FIGS. 2 (f) and 2 (g), and the video signal and the key signal are output in synchronization with each other.

  As described above, in the first embodiment, the video signal and the key signal are temporarily stored in the first buffer 11, and the control unit 12 outputs the video signal and the key signal from the first buffer 11 at double speed. Then, the encoding parameter corresponding to the video signal is acquired from the control unit 12 when the video signal is encoded by the encoder 13 and set in the encoder 13, and the code corresponding to the key signal is transmitted from the control unit 12 when the encoding of the video signal is completed. The encoding parameter is acquired and set in the encoder 13, and the video encoded data and the key encoded data encoded at the double speed by the encoder 13 are stored in the storage device 14.

  Also, the encoded video data and key encoded data are read from the storage device 14 at double speed, and the decoder 15 decodes the video / key signal at double speed, and the decoded video / key signal is stored in the second buffer 16. Thus, the video signal and the key signal are read out and output in parallel at a normal reproduction speed.

  Therefore, the encoding parameters are alternately switched using one encoder 13 to encode the video signal and the key signal at double speed, and the video encoded data and key encoded data are doubled using one decoder 15. Thus, the entire video storage / playback apparatus can be reduced in size.

  In addition, according to the first embodiment, the control unit 12 has a function of generating an encoding parameter corresponding to the video signal and an encoding parameter corresponding to the key signal, thereby enabling communication with the control unit 12. A single encoder 13 can be provided with a function of encoding a video signal and a function of encoding a key signal as required, and thus it is not necessary to newly provide an encoding parameter generation circuit, and a simple configuration It becomes.

(Second Embodiment)
FIG. 5 is a block diagram showing the configuration of the video storage / playback apparatus according to the second embodiment. In FIG. 5, the same parts as those in FIG.

  A difference from the first embodiment is that a parameter register 17 is added. The control unit 12 sets a video signal encoding parameter and a key signal encoding parameter in the parameter register 17. The first buffer 11 also outputs a signal for distinguishing which signal is output together with the video / key signal, and the parameter register 17 switches which parameter is supplied to the encoder 13 according to the signal.

  The encoder 13 is provided with a parameter setting unit 132. The parameter setting unit 132 sets the parameter received from the parameter register 17 in the encoder 13.

  In this way, the control unit 12 only needs to set the encoding parameter only once at the beginning, so the processing of the control unit 12 becomes light.

Next, the operation in the above configuration will be described.
When receiving a recording instruction from a host system (not shown), the control unit 12 reads the video signal from the first buffer 11 at double speed, and indicates that the encoding of the video signal (video 1) for one frame from the encoder 13 is finished. It is monitored whether or not it is notified, and when the end of encoding is notified, the key signal is read from the first buffer 11 at double speed, and the key signal (key 1) for one frame is read from the encoder 13. Whether or not the end of encoding is notified is monitored, and when the end of encoding is notified, the same processing is repeatedly executed for the video signal (video 2) after the next frame.

  In addition, when receiving a playback instruction from a host system (not shown), the control unit 12 reads the video encoded data (video 1 encoding) from the storage device 14 at a double speed and outputs it to the decoder 15. It is monitored whether or not notification of the end of decoding of the encoded data (video 1 encoding) is sent. When the end of decoding is notified, the key encoded data (key 1 encoding) is read from the storage device 14 at double speed and output to the decoder 15, and the key encoded data (key 1 code) is output from the decoder 15. Whether or not the completion of decryption is notified is monitored. Then, when notified of the end of decoding, the control unit 12 repeatedly executes the same processing for video encoded data of the next frame (video 2 encoding) and thereafter.

  Then, the video / key signal is output from the decoder 15 and stored in the second buffer 16. Thereafter, the control unit 12 reads out and outputs the video / key signal stored in the second buffer 16 at a normal reproduction speed.

  That is, in the operation of the second embodiment, the control unit 12 executes the process when the video signal and the key signal are read from the first buffer 11 and when the video encoded data and the key are read from the storage device 14. Only when the encoded data is read out and when the video signal and the key signal are read out from the second buffer 16. The other time can be used for communication processing with an external device. Therefore, it is not necessary to use a high-performance control unit.

  As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the encoding parameter corresponding to the video signal and the encoding parameter corresponding to the key signal are generated. The circuit can be configured by a hardware circuit such as the parameter register 17, whereby an encoded parameter generating circuit having a simple configuration and excellent response can be realized.

  Further, the control unit 12 writes the encoding parameter corresponding to the video signal and the encoding parameter corresponding to the key signal only once in the parameter register 17, and the video signal and key signal from the first buffer 11 as other processing. The processing load of the control unit 12 is greatly increased since the video data and the key encoded data are read from the storage device 14, and the video signal and the key signal are read from the second buffer 16. To be reduced.

(Other embodiments)
According to each of the above embodiments, video signals and key signals with different encoding parameters are temporarily stored in the first buffer 11, and the video signal and key signals are output from the first buffer 11 by the control unit 12 at double speed. Thus, the encoder 13 sets the encoding parameter corresponding to the video signal when the video signal is encoded, and switches to the encoding parameter corresponding to the key signal when the encoding of the video signal is completed.

  Therefore, since the first video signal and the second video signal are encoded by alternately switching the encoding parameters using one encoder 13, as shown in FIG. 6, for the video signal and the key signal. Compared to a video storage / playback apparatus that requires separate encoders 21 and 22 and decoders 23 and 24, the overall size of the apparatus can be reduced.

  In each of the above embodiments, the example of handling the video signal and the key signal has been described. However, an example of handling the on-air video signal and the preview video signal may be used. In this case, an encoding parameter (for example, Vy: Vc = 2: 1) is generated for an on-air video signal, and an encoding parameter (for example, Vy: Vc = 1: 1) is generated for a preview video signal. Will be generated. For the preview use, the operator in the broadcasting station confirms the content of the image, and therefore the quality may not be higher than that for the on-air use.

  In each of the above embodiments, the encoder and decoder operating at double speed have been described as an example. However, it is also possible to operate at triple speed or quadruple speed depending on the number of input video signals. In this case, the operator adjusts the encoder and decoder.

  In addition, it is not limited to the above-described embodiment as it is, and in the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 11 ... 1st buffer, 12 ... Control part, 13 ... Encoder, 14 ... Accumulator, 15 ... Decoder, 16 ... 2nd buffer, 17 ... Parameter register, 121 ... Parameter generation part, 131 ... Parameter setting part

Claims (10)

In a video storage device that encodes a first video signal and a second video signal that are different from each other in encoding parameters necessary for encoding and stores them in the storage unit,
A buffer for storing the first video signal and the second video signal;
An encoder that operates at a double speed that is an integral multiple of a playback speed required for video playback for one frame, encodes the output of the buffer with a set encoding parameter, and outputs encoded data to the storage unit;
A control unit that alternately reads out and outputs the first video signal and the second video signal stored in the buffer for each frame at the double speed;
Encoding the first video signal provided in the encoder, acquiring an encoding parameter corresponding to the first video signal at the time of encoding the first video signal by the encoder, and setting the encoding parameter in the encoder A video storage device comprising: a parameter setting unit that acquires an encoding parameter corresponding to a second video signal at the end and sets the encoding parameter in the encoder. The control unit includes a parameter generation unit that generates an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal,
The parameter setting unit obtains an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal from the control unit through communication with the control unit, and alternately sets the encoding parameter corresponding to the second video signal. The video storage device according to claim 1. Further, separately from the control unit, an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal are stored, and the first video signal output from the buffer is stored. And a parameter storage unit that alternately generates an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal at the generation timing of the second video signal,
The parameter setting unit receives an encoding parameter corresponding to the first video signal from the parameter storage unit when the first video signal is encoded by the encoder, and sets the first parameter to the encoder. 2. The video storage device according to claim 1, wherein at the end of encoding of the video signal, an encoding parameter corresponding to the second video signal is received from the parameter storage unit and set in the encoder.   2. The video storage device according to claim 1, wherein the first video signal and the second video signal are a video signal and a key signal. Video in which first video signal and second video signal having different encoding parameters necessary for encoding are encoded and stored in the storage unit, and the encoded data stored in the storage unit is reproduced and output In the storage and playback device,
A first buffer for storing the first video signal and the second video signal;
It operates at a speed that is an integral multiple of the playback speed required for video playback for one frame. The output of the first buffer is encoded with a set encoding parameter, and the first encoded data and the second encoded data are encoded. An encoder that outputs encoded data to the storage unit;
It operates at the double speed, decodes the first encoded data output from the storage unit into the first video signal, and decodes the second encoded data into the second video signal. A decoder;
A second buffer for storing and outputting the output of the decoder;
The first video signal and the second video signal stored in the first buffer are alternately read out for each frame at the double speed, and the first encoded data stored in the storage unit and The second encoded data is alternately read out for each frame at the double speed, and the first video signal and the second video signal stored in the second buffer are read out in parallel at the reproduction speed. A control unit for outputting;
Encoding the first video signal provided in the encoder, acquiring an encoding parameter corresponding to the first video signal at the time of encoding the first video signal by the encoder, and setting the encoding parameter in the encoder A video storage / playback apparatus comprising: a parameter setting unit that obtains an encoding parameter corresponding to a second video signal at the end and sets the encoding parameter in the encoder. The control unit includes a parameter generation unit that generates an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal,
The parameter setting unit obtains an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal from the control unit through communication with the control unit, and alternately sets the encoding parameter corresponding to the second video signal. The video storage / playback apparatus according to claim 5. Further, separately from the control unit, an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal are stored, and the first output from the first buffer is stored. A parameter storage unit that alternately generates an encoding parameter corresponding to the first video signal and an encoding parameter corresponding to the second video signal at the generation timing of the video signal and the second video signal;
The parameter setting unit receives an encoding parameter corresponding to the first video signal from the parameter storage unit when the first video signal is encoded by the encoder, and sets the first parameter to the encoder. 6. The video storage / playback apparatus according to claim 5, wherein at the end of encoding of the video signal, the encoding parameter corresponding to the second video signal is received from the parameter storage unit and set in the encoder.   6. The video storage / playback apparatus according to claim 5, wherein the first video signal and the second video signal are a video signal and a key signal. In a video storage method for encoding a first video signal and a second video signal, which are different from each other in encoding parameters necessary for encoding, and storing them in a storage unit,
Storing the first video signal and the second video signal in a buffer;
The first video signal and the second video signal stored in the buffer are alternately read and output frame by frame at a speed that is an integral multiple of the playback speed required to play back one frame of video. , Encoded with the encoding parameter set in the encoder operating at the double speed, and output to the storage unit,
When the first video signal is encoded by the encoder, an encoding parameter corresponding to the first video signal is acquired and set in the encoder, and the second video is encoded when the encoding of the first video signal is completed. A video storage method, wherein an encoding parameter corresponding to a signal is acquired and set in the encoder. Video in which first video signal and second video signal having different encoding parameters necessary for encoding are encoded and stored in the storage unit, and the encoded data stored in the storage unit is reproduced and output In the storage and playback method,
Storing the first video signal and the second video signal in a first buffer;
The first video signal and the second video signal stored in the first buffer are alternately read and output frame by frame at a speed that is an integral multiple of the playback speed required for video playback for one frame,
The output of the first buffer is encoded with an encoding parameter set in the encoder operating at the double speed, and the first encoded data and the second encoded data are output to the storage unit,
The first encoded data and the second encoded data stored in the accumulation unit are alternately read out for each frame at the double speed, and output.
The first encoded data output from the storage unit is decoded into the first video signal by the decoder operating at the double speed, and the second encoded data is converted into the second video signal by the decoder. Decrypt,
Store the output of this decoder in a second buffer;
Reading out and outputting the first video signal and the second video signal stored in the second buffer in parallel at the playback speed;
When the first video signal is encoded by the encoder, an encoding parameter corresponding to the first video signal is acquired and set in the encoder, and the second video is encoded when the encoding of the first video signal is completed. A video accumulation / playback method, wherein an encoding parameter corresponding to a signal is acquired and set in the encoder.

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