JP2018117308A - Playback apparatus and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve image quality and shorten a required time when one image is divided and decoded by a plurality of decoding units.SOLUTION: Decoders 24a, 24b share a part of each image constituting a moving picture and decode them. A control unit 28 determines each image of the moving image so that a slice boundary position at which the plurality of decoders 24a, 24b divide each slice into a plurality of slices to be decoded is set so as to have a predetermined number of overlapping lines between adjacent slices. Each of the decoders 24a, 24b decodes the encoded data of the corresponding slice among the plurality of slices divided at the slice boundary position of each image of the moving image.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a playback apparatus that plays back moving images and a control method thereof.

  When recording / reproducing or transmitting a moving image, it is common to employ a moving image compression encoding method that simultaneously realizes high image quality and a high compression rate. Along with an increase in the number of pixels of a frame constituting a moving image and an increase in frame rate, it is necessary to shorten the processing time for encoding and decoding.

  H. is a typical video compression encoding system. In the H.264 system, one frame (or picture) is encoded by being divided into a plurality of regions called slices extending in the horizontal direction. Patent Document 1 describes a configuration in which a picture is encoded at high speed by parallel processing by a plurality of encoding means. That is, when one picture is divided into a plurality of slices extending in the horizontal direction, the number of block lines in the remaining slices except for one slice is set to an integral multiple of the number of coding units, thereby performing parallel coding processing. To improve efficiency.

JP2012-015902A

  In the decoding process, it is necessary to apply a deblocking filter for reducing block noise at the slice position. In addition, the range of the reference image referred to by each decoder needs to be extended to a range beyond the slice. For this reason, for example, as illustrated in FIG. 11, the image range shared by each decoder is required to be divided so that a predetermined number of horizontal lines overlap each other. On the other hand, if the number of overlapping lines at the time of division is increased, the size of the partial image that each decoding unit decodes increases, and the processing time increases.

  An object of the present invention is to provide a playback apparatus and a control method therefor that solve these problems.

  A playback apparatus according to the present invention is a playback apparatus that decodes encoded data of a moving image, a plurality of decoding means, and a plurality of image processing means corresponding to each of the plurality of decoding means, A plurality of image processing means for performing predetermined image processing on the image data decoded by the corresponding decoding means, and each image of the moving image into a plurality of slices to be decoded by the plurality of decoding means, respectively. A slice boundary position at the time of division is determined at a slice boundary position determining unit that determines a predetermined number of overlap lines between adjacent slices, and the slice boundary position is determined by the slice boundary position determining unit. And means for supplying each slice to the corresponding decoding means of the plurality of decoding means.

  According to the present invention, since the decoding processing range of each decoding unit is determined by overlapping the number of lines determined in consideration of image quality deterioration, an image with good image quality can be reproduced in a shorter time.

It is a schematic block diagram of one Example of this invention. It is a flowchart of the recording operation of a present Example. It is a detailed flowchart of a slice boundary determination process. It is a correspondence table | surface of the horizontal line number of a moving image, and a slice division number. It is explanatory drawing of a slice division | segmentation. It is a correspondence table of the number of horizontal lines, deblocking processing, resizing processing, and color space conversion processing. It is a flowchart of animation reproduction | regeneration. It is explanatory drawing of the reference relationship of a pixel. It is another flowchart of slice boundary determination. It is a correspondence table of resolution, frame rate, and slice range. It is explanatory drawing of the overlapping range at the time of dividing | segmenting and decoding a screen with two decoders. It is an explanatory example of a slice division position.

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

  FIG. 1 shows a schematic block diagram of a recording / reproducing apparatus according to the present invention. The recording / reproducing apparatus 10 shown in FIG. 1 compresses and encodes a moving image and records and reproduces the moving image on the recording medium 50. Here, it is assumed that a moving image of up to 3804 × 2160 pixels can be handled. The recording medium 50 is composed of, for example, a memory card that is detachable from the recording / reproducing apparatus 10.

  Reference numeral 12 denotes a lens unit that includes a lens and that makes an optical image of a subject incident on the imaging unit 14. The imaging unit 14 includes an imaging device that converts an optical image from the lens unit 12 into an electrical signal, and a camera signal processing unit that converts an analog image signal output from the imaging device into a digital signal of a predetermined format. The imaging device is, for example, a CCD (Charge Coupled Device) type imaging device or a CMOS (Completementary Metal Oxide Semiconductor) type imaging device. The imaging unit 14 sequentially writes each image data constituting the moving image into a DRAM (Dynamic Random Access Memory) 18 via the data bus 16. The DRAM 18 is used to temporarily store image data before encoding and encoded image data.

  The encoding unit 20 encodes each image data temporarily stored in the DRAM 18 from the imaging unit 14 in accordance with a predetermined moving image compression encoding method, and writes the obtained encoded moving image data (or encoded data) back to the DRAM 18.

  In the recording mode, the media I / F 22 records the encoded data temporarily stored in the DRAM 18 on the recording medium 50 in a predetermined file format. In the reproduction mode, the media I / F 22 reads the encoded data recorded on the recording medium 50 and sequentially stores it in the DRAM 18.

  The decoding units 24a and 24b perform divided parallel processing on the encoded data temporarily stored in the DRAM 18. That is, the decoding units 24a and 24b individually handle and decode a part of the encoded data in the same picture screen. The image processing units 26a and 26b perform image processing such as color conversion processing and enlargement / reduction processing on the reproduced image data decoded by the decoding units 24a and 24b, respectively, and write the reproduced image data after processing back to the DRAM 18. . In FIG. 1, the decoding processing system is exemplified by two systems such as the decoding units 24a and 24b and the image processing units 26a and 26b, but this is only an example, and there may be three or more systems.

  The control unit 28 controls each unit of the recording / reproducing apparatus 10 via the control bus 32 in accordance with the setting, the operation state, and the operation of the operation unit 30. The operation unit 30 is a means for a user to give an operation instruction to the recording / reproducing apparatus 10 and includes, for example, a recording button, a menu button, a reproduction button, and the like. The operation unit 30 transmits a signal indicating the operation content of the user to the control unit 28 via the program bus 34.

  A ROM (Read Only Memory) 36 and a RAM (Random Access Memory) 38 are connected to the program bus 34. The ROM 36 stores a control program for the control unit 28 to control the recording / reproducing apparatus 10. The control unit 28 uses the RAM 38 as a work memory. The control unit 28 also has slice control means for determining the position of the slice at the time of encoding, and determines the range (number of lines) of partially overlapping image parts that the decoding units 24a and 24b are in charge of in the reproduction mode. Have means.

  The image display unit 40 includes a display panel such as an LCD (Liquid Crystal Display) or an organic EL (Organic Electro-luminescence), and displays an image of image data temporarily held in the DRAM 18.

  The recording operation of the present embodiment will be described with reference to FIG. FIG. 2 shows a flowchart of the recording operation of this embodiment. A control program corresponding to the process shown in FIG. 2 is stored in the ROM 114, and the control unit 28 reads the control program from the ROM 36 and executes it to implement the process shown in FIG. The control unit 28 starts the process illustrated in FIG. 2 in response to a user's moving image recording instruction from the operation unit 30.

  In S201, the control unit 28 determines a slice boundary for encoding according to the number of decoding processes that can be executed in parallel during reproduction (decoding). Details of the slice boundary determination process (S201) will be described later with reference to FIG. The control unit 28 stores the determined slice boundary position data (slice boundary position data) in the DRAM 18 and notifies or sets to the encoding unit 20. Here, as illustrated in FIG. 12, the control unit 28 determines two slice boundaries so that one screen (frame) is divided into three slices.

  In S <b> 202, the control unit 28 starts capturing a moving image captured by the imaging unit 14. That is, the control unit 28 drives the imaging elements of the lens unit 12 and the imaging unit 14, reads image data of each frame of the moving image from the imaging unit 14 at a predetermined rate, and sequentially stores them in the DRAM 18.

  In S203, the control unit 28 controls the encoding unit 20 to encode the image data sequentially stored in the DRAM 18 with slices divided at the slice boundary determined in S201. The encoding unit 20 stores the encoded data obtained by encoding in the DRAM 18 together with the slice boundary position data. The temporarily stored image data is encoded and stored in the DRAM 18.

  In S204, the control unit 28 causes the medium I / F 22 to record the encoded data of the DRAM 18 on the recording medium 50 in a format in which slice boundary position data is associated as a slice header.

  In step S205, the control unit 28 checks whether there is a recording end instruction from the user. Until there is a recording end instruction, the control unit 28 repeats the processes of S202 to S204. When there is a recording end instruction, the control unit 28 continues recording in the recording medium 50 up to the GOP delimiter frame in S206, then ends the recording on the recording medium 50, and ends the processing shown in FIG.

  FIG. 3 shows a detailed flowchart of the slice boundary determination process (S201). FIG. 4 is a table showing an example of the relationship between the number of horizontal lines (number of pixels in the vertical direction) of a moving image to be recorded and the number of slice divisions during recording and reproduction. A control program corresponding to the process shown in FIG. 3 is stored in the ROM 36, and the control unit 28 reads the control program from the ROM 36 and executes it to implement the process shown in FIG.

  In S301, the control unit 28 refers to the table shown in FIG. 4 and determines the division processing number N during reproduction (decoding) according to the number of horizontal lines of the moving image to be recorded. In S302, the control unit 28 determines whether or not the determined slice division number N is greater than one. When the slice division number N is larger than 1 (S302), the control unit 28 proceeds to S303. When the slice division number N is 1 (S302), since there is no slice division, there is no slice boundary, and the control unit 28 ends the processing shown in FIG. 3 and returns to FIG.

In S303, the control unit 28 determines (N-1) slice division positions in the reproduction process based on the slice division number N determined in S301. First, as shown in FIG. 5, the control unit 28 equally divides the number of horizontal lines of the moving image to be recorded by the slice division number N, and determines the division position. When the horizontal line number cannot be equally divided by the slice division number N, the control unit 28 determines the vertical width (horizontal) of the lowermost slice divided at the division position as shown in the following formulas (1) and (2). Adjust by reducing the number of lines). That is, for slice n where 0 <n <N,
H _n = H / N (1)
For the lowest slice N-1,
H _n = H− (H / N) × (N−1) (2)
And In Expressions (1) and (2), H indicates the number of horizontal lines of a moving image to be recorded, and H _{1 to} H _N indicate the number of horizontal lines of each slice.

For example, in the case of a moving image of 3840 × 2160 pixels, since the number of horizontal lines is 2160, the slice division number N = 2 from the table shown in FIG. Therefore, N-1 = 1 and
H ₁ = 1080 (3)
It becomes.

  In S304, the control unit 28 calculates the number of overlap lines Ov necessary for the reproduction process. The required number of overlap lines is the total number of image lines that deteriorate in the reproduction process. FIG. 6 shows a table of the number of horizontal lines required for the deblocking process, the resizing process, and the color conversion process with respect to the number of horizontal lines of the moving image to be recorded. Contents corresponding to the table shown in FIG. 6 are stored in the ROM 36. The control unit 28 refers to the table shown in FIG. 6 and determines the necessary number of overlap lines. In the example shown in FIG. 6, when the number of horizontal lines is 2160 lines, the required number of overlap lines Ov is 20. The specific numerical values in the table shown in FIG. 6 are determined according to the specification and processing capability of the recording / reproducing apparatus 10.

In S305, the control unit 28 determines slice boundary positions X _2n-1 and X _2n in consideration of overlap based on the division position determined in S303 and the overlap line number Ov determined in S304. That is, the control unit 28 first, the position _{L 2n} for overlapping line number Ov plus determined in S304 the dividing position _{H n} determined in S303, the division location _{H n} position obtained by subtracting the overlap line number Ov from _{L 2n -1} . When the division position H _n is 1080 and the number of overlap lines Ov is 20,
L _2n-1 = 1080-20 = 1060 (4)
L _2n = 1080 + 20 = 1100 (5)
It becomes.

The control unit 28 further corrects the slice boundary position so as to be in units of macrobooks. The minimum value that exceeds L _2n among the multiples of 16 that are the number of pixels of the macroblock is the final slice boundary X _2n, and the maximum value that does not exceed L _2n-1 among the multiples of 16 is another final slice boundary. Let X _2n-1 . That is,
X _2n-1 = L _2n-1- (L _2n-1 % 16) = 1060-4 = 1056 (6)
X _2n = L _2n + (16−L _2n % 16) = 1100 + 4 = 1104 (7)
It becomes. % Is a modulo operator. This result coincides with the slice boundary position shown in FIG.

When the slice boundary positions X _2n-1 and X _2n with the overlap added are determined, the control unit 28 exits the process shown in FIG. 3 and returns to the flow shown in FIG.

  With reference to FIG. 7, the moving image reproducing operation of the present embodiment will be described. FIG. 7 shows a flowchart of the moving image playback operation controlled by the control unit 28. The control unit 28 implements the process shown in FIG. 7 by reading the control program for realizing the process shown in FIG. 7 from the ROM 36 and executing it. When the user inputs an instruction to reproduce a predetermined moving image to the control unit 28 using the operation unit 30, the control unit 28 starts the process shown in FIG.

  In S701, the control unit 28 instructs the media I / F 22 to read separately designated moving image data from the recording medium 50. In accordance with this instruction, the media I / F 22 reads the designated moving image data (encoded data) and slice header from the recording medium 50 and develops them in the DRAM 18.

  In step S <b> 702, the control unit 28 acquires slice boundary position data from the slice header of moving image data expanded in the DRAM 18.

  In S703, the control unit 28 calculates the number of divisions to be divided by the decoding units 24a and 24b and the image processing units 26a and 26b. Specifically, the control unit 28 determines the division number N of the division reproduction processing by the decoding units 24a and 24b and the image processing units 26a and 26b based on the table shown in FIG. In this embodiment, since the number of horizontal lines is 2160 lines, the division number N = 2.

In S704, the control unit 28, based on the division number N calculated in S703, determines a division position _{H n.} The division position determination method is the same as that in step S303. Since N−1 = 1, there is one division position,
H1 = 1080 (8)
It becomes.

  In step S705, the control unit 28 calculates the number of pixels that deteriorate during reproduction, that is, the number of overlap lines Ov. The calculation of the overlap line number Ov is the same as that in step S304. Here, the required number of overlap lines Ov is 20.

In S706, the control unit 28 determines a processing range to be handled by the playback system (decoding units 24a and 24b and image processing units 26a and 26b) for each frame of the moving image to be played back. Specifically, first, the control unit 28 calculates a position D _{2n-1 obtained} by subtracting the position D _2n obtained by adding the value of the overlap line number Ov calculated in S705 to the division position determined in S704. Since H1 = 1080 and Ov = 20,
D _2n-1 = 1080-20 = 1060 (9)
D _2n = 1080 + 20 = 1100 (10)
It becomes. The control unit 28 further corrects the positions D _2n and D _2n-1 so as to be in units of macrobooks. The minimum value that exceeds D _2n among the multiples of 16 that are the number of pixels of the macroblock is defined as the boundary position E _2n of the processing range, and the maximum value that does not exceed D _2n−1 among the multiples of 16 is another boundary position of the processing range. E _2n-1 . That is,
E _2n−1 = D _2n−1 − (D _2n−1 % 16) = 1060−4 = 1056 (11)
E _2n = D _2n + (16−D _2n % 16) = 1100 + 4 = 1104 (12)
It becomes. % Is a modulo operator. This result coincides with the slice boundary position shown in FIG. One playback system (decoding unit 24a and image processing unit 26a) is responsible for the 0th to 1104th lines (processing range 1), and the other playback system (decoding unit 24b and image processing unit 26b) is 1056 lines. It takes charge of the 2160th line (processing range 2) from the eyes. By such an operation, the overlapping range of the processing ranges 1 and 2 of the decoding units 24a and 24b can be determined as a minimum range equal to or more than the number of overlap lines.

  In S707, the control unit 28 instructs the decoding units 24a and 24b to decode each frame of the encoded moving image data stored in the DRAM 18 sequentially. For example, the control unit 28 instructs the decoding unit 24a to decode the processing range 1, and instructs the decoding unit 24b to decode the processing range 2. Each of the decoding units 24 a and 24 b decodes the image portions in the processing ranges 1 and 2, and stores the reproduced image data resulting from the decoding in the DRAM 18. Note that the decoding units 24a and 24b perform a deblocking process for removing block noise. Since the deblocking process is an image process using pixels of adjacent blocks, the image quality at the division position is degraded.

  In step S708, the control unit 28 instructs the image processing units 26a and 26b to perform image processing on the image data decoded by the decoding units 24a and 24b, respectively. In response to this instruction, the image processing unit 26a performs color conversion processing and enlargement / reduction processing on the image data decoded by the decoding unit 24a, and stores the processed image data in the DRAM 18. Similarly, the image processing unit 26b performs color conversion processing and enlargement / reduction processing on the image data decoded by the decoding unit 24b, and stores the processed image data in the DRAM 18. The overlapping portions of the image data processed by the image processing units 26a and 26b are synthesized on the DRAM 18. As a result, the divided and decoded image data is collected into one frame.

  Image processing by the image processing units 26a and 26b generally refers to a plurality of adjacent pixel values arranged vertically upward and downward as shown in FIG. The example illustrated in FIG. 8A illustrates an example in which image processing of the pixel 4 is performed with reference to the four pixels in the vertical direction. In this case, a new pixel value of the pixel 4 is generated with reference to the pixels 0 to 3 and the pixels 5 to 8. On the other hand, at the image end to be processed, there is no pixel in either the upward direction or the downward direction. FIG. 8B shows an example in which no reference pixel exists in the upward direction. In this case, although the same image processing algorithm can be applied by artificially creating pixels in the upward direction, the image quality of the end pixels deteriorates because it is a pseudo image. For example, when the image processing of the pixel 4 in FIG. 8B refers to four pixels in each of the upward direction and the downward direction, four pixels obtained by copying the pixel 4 upward are generated in a pseudo manner. Then, a new pixel value of the pixel 4 is generated using the suspicious pixel generated in this way as a reference pixel.

  In S709, the control unit 28 causes the image display unit 40 to display the image data of the DRAM 18 processed by the image processing units 26a and 26b and combined into a single frame as an image.

  As described above, in this embodiment, the slice boundary position is determined in consideration of the number of horizontal lines of images that need to be overlapped as a division range at the time of division reproduction, so that the reprocessing time can be shortened.

  A second embodiment will be described in which the slice boundary position is determined in advance according to the resolution and frame rate of the moving image, and the slice boundary position to be applied is determined according to the resolution and frame rate of the moving image to be actually recorded. Also here, it is assumed that a 3840 × 2160 size moving image having a frame rate of 60 fps is recorded and reproduced.

  The second embodiment is the same as the process shown in FIG. 2 except for the slice boundary determination process (S201). In brief, the control unit 28 executes slice boundary position determination processing shown in FIG. 9 at the time of moving image encoding, and the control unit 28 sends the slice boundary position determined in the processing shown in FIG. 9 to the encoding unit 20. Notice. The encoding unit 20 encodes the moving image data from the imaging unit 14 based on the slice boundary position notified from the control unit 28.

  FIG. 9 is a flowchart of slice boundary position determination processing according to the second embodiment. With reference to FIG. 9, the slice boundary determination process according to the second embodiment will be described. A control program corresponding to the process shown in FIG. 9 is stored in the ROM 36, and the control unit 28 reads the control program from the ROM 36 and executes it, thereby realizing the process shown in FIG.

  In step S901, the control unit 28 acquires the resolution of the moving image to be recorded, and in step S902, acquires the frame rate.

  In S903, the control unit 28 determines the slice boundary position based on the resolution acquired in S901 and the frame rate acquired in S902. FIG. 10 shows a correspondence table of the number of divisions and slice boundary positions with respect to the resolution and frame rate of a moving image. A table as shown in FIG. 10 is stored in the ROM 36, for example. The control unit 28 refers to the table shown in FIG. 10 and determines the number of divisions and slice boundary positions corresponding to the resolution and the frame rate. In the case of a moving image having 3840 × 2160 pixels and a frame rate of 60 fps, it is divided into slices 1 to 1056 lines, slices 2 to 1056 to 1104 lines, and slices 3 to 1104 to 2160 lines.

  Even when the moving image encoded and recorded on the recording medium 50 is reproduced, when one frame is divided and decoded by a plurality of reproduction systems, the same procedure as the processing procedure shown in FIG. Thus, the processing range of each reproduction system is determined.

  Since the table storing the predetermined slice boundary position with respect to the resolution and the frame rate is referred to, the slice boundary position to be applied can be quickly determined.

  As mentioned above, although the preferable Example of this invention was described, this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary.

  The control by the control unit 28 may be performed by one piece of hardware, or the entire apparatus may be controlled by a plurality of pieces of hardware sharing the processing.

  Although the present invention has been described in detail based on the preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms without departing from the gist of the present invention are also included in the present invention. included. Furthermore, each embodiment mentioned above shows only one embodiment of this invention, and it is also possible to combine each embodiment suitably.

  In the above-described embodiment, the case where the present invention is applied to an imaging apparatus has been described as an example. However, this is not limited to this example, and recording / reproduction is performed by compressing and encoding a video signal from a camera. Applicable to devices in general. Of course, the present invention can also be applied to a recording / reproducing apparatus and a reproducing apparatus realized on a computer.

  The object of the present invention can also be achieved by supplying a storage medium storing software program codes for realizing the functions of the above-described embodiments to the apparatus. At this time, the computer (or CPU or MPU) including the control unit of the supplied apparatus reads and executes the program code stored in the storage medium. The program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a magnetic disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, or a ROM can be used.

  In some cases, an OS (basic system or operating system) running on the apparatus performs part or all of the processing based on the above-described program code instructions, and the functions of the above-described embodiments are realized by the processing. included.

  Furthermore, the case where the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the apparatus or a function expansion unit connected to a computer, and the functions of the above-described embodiments are realized. It is. At this time, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

  The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

Claims (7)

A playback device for decoding encoded data of a video,
A plurality of decryption means;
A plurality of image processing means corresponding to each of the plurality of decoding means, a plurality of image processing means for performing predetermined image processing on the image data decoded by the corresponding decoding means;
The slice boundary position when each image of the moving image is divided into a plurality of slices to be decoded by the plurality of decoding units is determined so as to have a predetermined number of overlap lines between adjacent slices. Slice boundary position determining means;
And a means for supplying each slice divided at the slice boundary position determined by the slice boundary position determination means to a corresponding decoding means among the plurality of decoding means.   2. The reproducing apparatus according to claim 1, wherein the number of overlap lines is determined according to a deblocking process by the decoding unit and a range of deterioration by a color conversion process and a resizing process by the image processing unit. . The slice boundary position determining means includes
Means for determining the number of slice divisions according to the number of horizontal lines of the video;
Means for determining a slice division position when the video image is divided by the number of slice divisions;
Means for determining the number of overlap lines;
Boundary position determining means for determining the slice boundary position from the slice division position and the number of overlap lines so that the slice divided at the slice boundary position overlaps more than the number of overlap lines. The playback apparatus according to claim 1, wherein:   4. The playback apparatus according to claim 3, wherein the boundary position determining unit determines the slice boundary position so as to sandwich the slice division position from a value corresponding to a multiple of the number of pixels of a macroblock.   The boundary position determining means sets one slice boundary position as a multiple of the number of pixels of the macroblock that is smaller and closest to the result obtained by subtracting the number of overlap lines from the slice division position, and sets the overlap position at the slice division position. 4. The reproducing apparatus according to claim 3, wherein a multiple of the number of pixels of the macroblock that is larger and closest to the result of adding the number of lines is set as the other slice boundary position.   2. The playback apparatus according to claim 1, wherein the slice boundary position determining unit determines a slice boundary position for the moving image with reference to a table storing slice boundary positions for each resolution and frame rate of the moving image. . A method of controlling a playback device for playing back encoded data of a moving image in a plurality of playback systems comprising a decoding means and an image processing means for applying predetermined image processing to the output of the decoding means,
The slice boundary position when each image of the moving image is divided into a plurality of slices to be decoded by the plurality of decoding units is determined so as to have a predetermined number of overlap lines between adjacent slices. A slice boundary position determining step;
And a step of controlling each of the slices divided at the slice boundary position to be decoded by a corresponding decoding unit of the plurality of decoding units.

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