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Image intra-frame prediction method and device

An intra-frame prediction and intra-prediction technology, applied in the field of compression, can solve the problem that the predictive coding method cannot be applied to different scenes of macroblocks, and achieve the effect of reducing the theoretical limit entropy and improving the coding compression rate

Active Publication Date: 2019-03-29
XIAN CREATION KEJI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current predictive coding method, a single predictive coding method is used for each MB, and a single predictive coding method cannot be applied to different scenarios of macroblocks

Method used

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  • Image intra-frame prediction method and device
  • Image intra-frame prediction method and device

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Embodiment 1

[0056] See figure 1 , figure 1It is a schematic flow chart of an image intra-frame prediction method provided by an embodiment of the present invention; this embodiment describes in detail an image intra-frame prediction method provided by the present invention, and the method includes the following steps:

[0057] Step 1, dividing the current image frame into a plurality of image macroblocks;

[0058] The current image frame can be divided into image macroblocks of fixed size or image macroblocks of different sizes, each image macroblock includes multiple pixels, and the size of the image macroblock is m*n, that is, the image macroblock It includes m*n pixels.

[0059] Step 2, sampling the pixels in each image macroblock to obtain sampled pixels;

[0060] Multiple sets of non-equidistant sampling are performed on the pixels in each image macroblock to obtain corresponding multiple sets of sampled pixels, specifically including:

[0061] According to the texture correlatio...

Embodiment 2

[0114] This embodiment describes in detail an image intra prediction device proposed by the present invention on the basis of the above embodiments, as follows Figure 5 as shown, Figure 5 It is a schematic diagram of an image intra prediction device provided by an embodiment of the present invention, the device includes:

[0115] A division module 11, configured to divide the current image frame into a plurality of image macroblocks;

[0116] A sampling module 12, connected to the division module 11, for sampling pixels in each image macroblock to obtain sampled pixels;

[0117] The first intra-frame prediction module 13 is connected to the sampling module 12, and is used for determining, for each of the image macroblocks, based on the sampled pixels in each of the image macroblocks, by a first intra-frame prediction method Describe the first predicted value of each pixel in each image macroblock;

[0118] A segmentation module 14, connected to the segmentation module 11,...

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Abstract

The invention relates to an image intra-frame prediction method and device. The method comprises the steps that a current image frame is divided into a plurality of image macro blocks; pixels in eachimage macro block are sampled to obtain sampled pixels; for each image macro block, based on the sampled pixels in each image macro block, a first prediction value of each pixel in each image macro block is determined in a first intra-frame prediction mode; each image macro block is divided into a plurality of image sub-macro blocks; for each image macro block, based on a division mode of the multiple image sub-macro blocks, a second prediction value of each pixel in each image macro block is determined in a second intra-frame prediction mode; and a final intra-frame prediction mode of each image macro block is determined according to the first prediction value and the second prediction value. Compared with an existing method, the two intra-frame prediction modes are selected for carryingout image frame prediction; the coding compression rate of image frames can be improved for the image macro blocks of different scenes; and a theoretical limit entropy of compression is further reduced.

Description

technical field [0001] The invention relates to the technical field of compression, in particular to an image intra-frame prediction method and device thereof. Background technique [0002] The natural form of a digital video signal for images is a sequence of images. A frame of image is usually a rectangular area composed of several pixels, while a digital video signal is a sequence of video images consisting of dozens to thousands of frames of images, sometimes referred to as a video sequence or sequence. Encoding a digital video signal is encoding a frame-by-frame image. [0003] In the latest international video compression standard HEVC (High Efficiency Video Coding), when encoding a frame of image, a frame of image is divided into several M*N pixel macroblocks (Macro Block, referred to as MB), with MB as the basic encoding The unit encodes the image piece by piece. Therefore, encoding a video image sequence is to encode each MB sequentially. Similarly, each MB is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/176H04N19/132H04N19/146H04N19/593
CPCH04N19/132H04N19/146H04N19/176H04N19/593
Inventor 李雯田林海
Owner XIAN CREATION KEJI CO LTD
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