JP6008043B2 - Video encoding device - Google Patents

Description

  The present invention relates to a moving image encoding apparatus that encodes a plurality of reference size videos obtained by dividing an original image into screens.

  In recent years, an image having a larger number of pixels than an HDTV (High Definition TeleVision) image (reference size video) has been used. For example, a QHDTV (Quad High Definition TeleVision) image has four times as many pixels (3840 × 2160 pixels) as an HDTV image. Therefore, four HD-SDI (Serial Digital Interface) systems are required to transmit a moving image of a QHDTV image, and the amount of information is 1.485 Gbps × 4. In order to record or transmit such a moving image having a large number of pixels, a high-speed and large-capacity recording / reproducing apparatus or transmission apparatus is required.

  The maximum image size that can be encoded by a general MPEG (Moving Picture Experts Group) encoder is an HDTV image. Therefore, in order to encode a moving picture exceeding that, it is changed to several sets of HDTV sizes and encoded using a plurality of MPEG encoders. For example, QHDTV requires four MPEG encoders. By using compression in this way, it is possible to handle a recording / reproducing apparatus with a small capacity and a slow speed, or a transmission path with a narrow band or a low bit rate.

Japanese Unexamined Patent Publication No. 2004-120499

  Conventionally, an original image output from a general 4K camera or the like is divided into four and each is encoded. However, there is a problem in that a difference in image quality occurs between the divided images and the joint between them is understood.

  On the other hand, a method has been proposed in which the joint image is sampled by applying a special mask to the original image when dividing the screen (see, for example, Patent Document 1). However, there is a problem that it is necessary to perform sampling on the decoder side, which is the reverse of sampling, for a plurality of divided images.

  The present invention has been made to solve the above-described problems, and the purpose thereof is a moving image that does not require special processing on the decoder side and can obscure the joint between encoded images. An encoding device is obtained.

A moving picture encoding apparatus according to the present invention includes a plurality of encoding apparatuses that obtain encoded data by encoding a plurality of reference size videos obtained by dividing an original image into screens, and the plurality of encoding apparatuses are given as follows: An encoding unit that encodes one of the plurality of reference-size images based on the encoding parameter and obtains the encoded data , the encoding parameter at the time of encoding, and an encoding result that is a statistical value And a control unit that controls the encoding unit by giving the encoding parameter, the encoded data encoded by the encoding unit of the own encoding device, and an encoding unit of another encoding device Each of the plurality of encoding devices is a master device, the rest is a slave device, the control unit of the master device, All the above Takes in the encoded result of over blanking device, together with the coding result of the master device itself, the so image quality difference between each other a plurality of coded data is reduced by the encoding of each encoding device The encoding parameter to be used is determined, the connection between the plurality of encoding devices is a serial connection, and the output of the last slave device of the plurality of encoding devices serially connected in order from the master device is the master The multiplexing unit returns all the encoded data and the encoding result multiplexed by the previous serially connected encoding device, and the encoding unit of the self-encoding device. The encoded encoded data and the encoded result are multiplexed and output.

  According to the present invention, a special process on the decoder side is not required, and a joint between encoded images can be obscure.

It is a block diagram which shows the moving image encoder which concerns on Embodiment 1 of this invention. It is a block diagram which shows the moving image encoder which concerns on Embodiment 2 of this invention.

  A video encoding apparatus according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a moving picture coding apparatus according to Embodiment 1 of the present invention. The camera 1 is a general 4K camera, which divides an original image into four and divides the screen into four reference size videos SDIa to SDId and outputs them. The reference size videos SDIa to SDId are HDTV images. The camera 1 is not limited to four divisions, and the original image may be divided into a plurality of reference size images and output. However, the number of pixels of the original image is limited to an integer multiple of the number of pixels of the reference size video.

  The reference size images SDIa to SDId are input to the encoding devices A, B, C, and D, respectively. Each encoding device includes an encoding unit 2, a control unit 3, an information TS packet generation / analysis unit 4, and a TS multiplexing unit 5. The encoding device A is a master device, and the remaining encoding devices B, C, and D are slave devices.

  The encoding unit 2 is an MPEG encoder, and encodes an input reference size video based on an encoding parameter to obtain encoded data and an encoding result. At this time, the control unit 3 controls the encoding unit 2. Here, the encoded data is H.264. The compressed data is based on a video compression standard such as H.264. The encoding result is an encoding parameter and a statistical value such as a bit rate at the time of encoding, a quantization parameter average value, a code amount average value, and time information.

  The information TS packet generation / analysis unit 4 has a function (information TS packet generation function) for converting arbitrary information into a TS (Transport Stream) packet, and a function for extracting information TS packets from the TS packet and acquiring arbitrary information ( Information TS packet analysis function). The TS multiplexing unit 5 multiplexes and outputs the TS output from the information TS packet generation / analysis unit 4 in its own device and the TS from the encoding unit in its own device.

  The control unit 3 of the encoding device A that is the master device takes in the encoding results of all the slave devices and combines them with all the encoding devices A, B, C, and D together with the encoding results of the master device A itself. The encoding parameters used in the encoding unit 2 of each of the encoding devices A to D are determined so as to reduce the image quality difference between the plurality of encoded data to be output, and the slave devices B, C, and D are instructed. . The instruction from the encoding apparatus A includes instruction information from the apparatus A to all apparatuses and individual instruction information to each apparatus.

  Next, the operation will be described. First, the master device A passes to the slave device B an instruction including the encoding parameters used in the encoding unit 2 of each of the encoding devices A to D and the encoded data of the master device itself. The slave device B takes in the encoding parameters for the self device from the instruction of the master device A, multiplexes the encoded data and the encoding result of the slave device B and the encoded data of the master device A, and the instruction from the master device A To the slave device C. The slave device C takes in the encoding parameters for the own device from the instruction of the master device A, and encodes the slave device C, the encoded result, the encoded data of the master devices A and B, and the encoded result of the slave device B. Are multiplexed and passed to the slave device C together with the instruction from the master device A. The last slave device D takes in the coding parameters for the device itself from the instruction of the master device A, outputs the coded data of the master device A and all slave devices B to D including itself to the decoder, and The data is multiplexed together with the encoded data of the apparatus and the encoded result, and returned to the master apparatus A.

  Here, the encoding parameters are filter strength, quantization matrix, picture structure (picture type, etc.), and bit rate. Based on the encoding result of each device, the former three determine each parameter, for example, from the average value of the encoding results of all devices, and set the same value in all devices. As for the bit rate, an individual value is set in each device based on the encoding result of each device. Specifically, the bit rate given to each device is determined according to the ratio between the complexity index of each device and the total value of the complexity indexes of all devices. Here, the complexity index is a product of the code amount and the quantization scale.

  Since the divided images are different from each other, each encoding apparatus conventionally sets different encoding parameters. As a result, image quality differences occur between the divided images, and the joints between them are known. On the other hand, in the present embodiment, each of the encoding devices A, B, and C is reduced so that the image quality difference between the plurality of encoded data output from the encoding devices A, B, C, and D is reduced. , D are determined by the encoding unit 2, the image quality of each image becomes uniform as a whole. As a result, when the encoded images are decoded and combined, it is possible to obscure the joint between the images.

  In this embodiment, a plurality of reference size videos obtained by dividing the original image into screens are encoded. In other words, unlike the prior art, the original image is not sampled by applying a special mask. Therefore, special processing on the decoder side is not required. Thereby, a general decoder can be used.

  In the present embodiment, master device A transmits data to slave device B, slave device B transmits data to slave device C, slave device C transmits data to slave device D, and the last slave. Device D returns data to master device A. That is, a combination of the encoded data of each device and the encoding result is sequentially multiplexed and finally returned to the master device. Thus, since the connection between the encoding devices A, B, C, and D is a serial connection, the number of connections can be reduced.

Embodiment 2. FIG.
FIG. 2 is a block diagram showing a moving picture coding apparatus according to Embodiment 2 of the present invention. Each of the encoding devices A, B, C, and D further includes a video analysis unit 6 that analyzes a reference size video before encoding and extracts video feature values. Specifically, the video analysis unit 6 performs a frame search to obtain a frame compensation SAD accumulated value and a motion vector accumulated value. The control unit 3 of the master device A determines the bit rate of encoding by the encoding unit 2 of each encoding device based on the analysis result of the video analysis unit 6 of each encoding device. Since the video analysis unit 6 performs video analysis that precedes the encoding unit 2 by several frames, the real-time response to a scene change or the like is improved.

A, B, C, D encoding device, 1 camera, 2 encoding unit, 3 control unit, 4 information TS packet generation / analysis unit, 5 TS multiplexing unit, 6 video analysis unit

Claims (3)

A plurality of encoding devices that obtain encoded data by encoding a plurality of reference size videos obtained by dividing an original image into screens,
The plurality of encoding devices include:
A code that encodes one of the plurality of reference-size images based on a given encoding parameter to obtain the encoded data , the encoding parameter at the time of encoding, and an encoding result that is a statistical value And
A control unit that gives and controls the encoding parameter to the encoding unit;
A multiplexing unit that multiplexes and outputs the encoded data encoded by the encoding unit of the self-encoding device and the encoded data encoded by the encoding unit of another encoding device,
One of the plurality of encoding devices is a master device, the rest is a slave device,
The control unit of the master device takes the encoded result of all of the slave device, together with the coding result of the master device itself, the image quality difference between each other of the plurality of coded data is reduced To determine the encoding parameter used in the encoding unit of each encoding device,
The connection between the plurality of encoding devices is a serial connection,
The output of the last slave device of the plurality of encoding devices serially connected in order from the master device is returned to the master device,
The multiplexing unit includes all the encoded data and the encoding result multiplexed by the immediately preceding encoding device connected serially, and the code encoded by the encoding unit of the own encoding device. A video encoding apparatus, wherein the encoded data and the encoding result are multiplexed and output.   The multiplexing unit stores all the encoded data multiplexed by the previous encoding device and the encoded data encoded by the encoding unit of its own encoding device in TS packets, respectively. The moving picture coding apparatus according to claim 1, wherein the moving picture coding apparatus performs multiplexing. Each encoding device has a video analysis unit for analyzing the reference size video before encoding,
The said control part of the said master apparatus determines the encoding parameter used with the said encoding part of each encoding apparatus based on the analysis result of the said video analysis part of these encoding apparatuses. Item 3. The moving image encoding device according to Item 1 or 2 .

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