Motion picture coding method and device

A coding method and moving image technology, applied in the field of moving image coding programs, can solve problems such as buffer underflow, achieve the effects of suppressing buffer underflow, reducing the amount of calculation, and improving image quality

Active Publication Date: 2017-07-07
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, buffer underflow (buffer underflow) is prone to occur in the intra picture at the start of encoding, the scene change, and the subsequent inter picture.

Method used

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  • Motion picture coding method and device
  • Motion picture coding method and device

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0070] image 3 Fig. 1 is an apparatus configuration diagram related to Embodiment 1 of the present invention. In addition, regarding other examples, the basic device structure is the same as that of the first example.

[0071] The normal encoding area setting unit 101 determines which macroblock is to be normally encoded based on the picture number, and outputs this information to the block encoding control unit 102 as normal encoding area information. In the first embodiment, as described above, the normal coding area is enlarged in columns of 2 macroblocks per picture. In addition, only the first picture (the picture number is 0) becomes an intra picture. Therefore, starting from the picture whose picture number is 40, normal encoding is performed in all macroblocks.

[0072] The block encoding control unit 102 inputs a picture, and further inputs normal encoding area information corresponding to the picture. Furthermore, in screen scanning order, if the macroblock of t...

Embodiment 2

[0083] Although the basic flow of the second embodiment is the same as that of the first embodiment, the operation of the normal encoding unit 103 is somewhat different. Specifically, the operation at the time of inter-frame encoding of a block is different.

[0084] In a general H.264 coder, inter-coding may be performed with reference to the simplified coding region because the normal coding region and the simplified coding region in the reference picture are not considered during the dynamic search during intercoding of a block. Generally, in a dynamic search, a prescribed search range centered on a prescribed search center is searched. exist Figure 5 The example is shown in (A). In the H.264 coder, there is a case where the predictive vector is used as the search center. In this case, the search range is included in the simplified coding area of ​​the reference picture, and since this block is coded with reference to the simplified coding area, a Lots of prediction res...

Embodiment 3

[0088] Although the basic flow of the third embodiment is the same as that of the first embodiment, the operation of the normal encoding unit 103 is slightly different. Specifically, the coding operation of macroblocks co-located with the simplified coding region of the reference picture among the macroblocks of the normal coding region of the coding target picture is different. Such a macroblock, for example, is equivalent to figure 2 Macroblocks C and D in picture 1 of .

[0089] In encoding of a macroblock, mode determination is generally performed. In mode determination, the rate-distortion cost after intra-coding is compared with the rate-distortion cost after inter-coding, and an encoding method that minimizes the rate-distortion cost is selected.

[0090] exist Figure 7 A flowchart of Example 3 is shown in . First, perform intra prediction (S301). In the normal coding unit 103 of the third embodiment, it is determined whether the current macroblock is co-located ...

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Abstract

In an intra picture, a predetermined area is set as a normal coding area, and other areas are set as a simplified coding area. In subsequent pictures, the normal coding area is set as a larger area including the normal coding area of ​​the previous picture, and the other areas are set as simple coding areas. In each picture, normal coding is performed on the blocks in the normal coding area, and simple coding is performed on the blocks in the simple coding area with a smaller amount of generated coding and calculation than normal coding.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2012-014062 for which it applied in Japan on January 26, 2012, and uses the content here. The present invention relates to a moving picture coding method, a moving picture coding device, and a moving picture coding program for switching between a normal coding method and a simple coding method which generates a small amount of coding and calculation and encodes a moving picture. Background technique [0002] In video encoding in two-way communication, the size of the virtual buffer is made very small in order to achieve low latency. For this reason, buffer underflow (buffer underflow) is likely to occur in the intra picture at the start of encoding, the scene change, and the inter picture thereafter. [0003] In such a situation, by applying, for example, the technique described in Patent Document 1, the possibility of buffer underflow can be reduced at the time of intra picture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/17H04N19/127H04N19/115H04N19/103
CPCH04N19/107H04N19/115H04N19/124H04N19/132H04N19/152H04N19/167H04N19/176H04N19/18
Inventor 北原正树清水淳中村健京地清介小野尚纪
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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