WO2019024438A1 - 一种图像编码方法 - Google Patents

一种图像编码方法 Download PDF

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WO2019024438A1
WO2019024438A1 PCT/CN2018/071773 CN2018071773W WO2019024438A1 WO 2019024438 A1 WO2019024438 A1 WO 2019024438A1 CN 2018071773 W CN2018071773 W CN 2018071773W WO 2019024438 A1 WO2019024438 A1 WO 2019024438A1
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block
prediction
color difference
intra
motion vector
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PCT/CN2018/071773
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王世榕
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南通海鑫信息科技有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/513—Processing of motion vectors
    • H04N19/517—Processing of motion vectors by encoding
    • H04N19/52—Processing of motion vectors by encoding by predictive encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/172—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/513—Processing of motion vectors

Definitions

  • the present invention relates to the field of image processing technologies, and in particular, to an image encoding method.
  • An image encoding method provided by the present invention includes the following steps:
  • Intra-luminance prediction mode of a prediction block of the second luminance signal Intra-luminance prediction mode of a prediction block of the second luminance signal
  • Intra-luminance prediction mode of a prediction block of the third luminance signal is Intra-luminance prediction mode of a prediction block of the third luminance signal
  • Intra-luminance prediction mode of the prediction block of the fourth luminance signal is Intra-luminance prediction mode of the prediction block of the fourth luminance signal
  • the intra color difference prediction mode of the prediction block of the first color difference signal at the same reference position as the prediction block of the first luminance signal is the same reference position as the prediction block of the first luminance signal
  • the intra color difference prediction mode of the prediction block of the second color difference signal at the same reference position as the prediction block of the second luminance signal is the same reference position as the prediction block of the second luminance signal
  • the intra color difference prediction mode of the prediction block of the third color difference signal at the same reference position as the prediction block of the third luminance signal is the same reference position as the prediction block of the third luminance signal
  • the order of the intra chroma prediction modes of the prediction block of the fourth color difference signal at the same reference position as the prediction block of the fourth luminance signal is a coded string in which the information related to the prediction mode is arranged.
  • the first vector of the motion vector of the adjacent block is not subjected to scaling based on the temporal distance.
  • the second derivation method based on the temporal distance scaling is performed from the motion vector of the adjacent block
  • the candidate is derived.
  • the method before the generating step, the method further includes:
  • the minimum coding is set.
  • the first to fourth divisions in which the color difference signal of the minimum coding block is horizontally and vertically divided are set.
  • the prediction block of the color difference signal, and for each prediction block of the color difference signal, predicts the color difference signal from the block of the surrounding encoded color difference signal according to the intra color difference prediction mode.
  • the invention has the beneficial effects of being able to improve coding efficiency in encoding of an image.
  • An image encoding method provided by the present invention includes the following steps:
  • the minimum coding is set.
  • the first to fourth divisions in which the color difference signal of the minimum coding block is horizontally and vertically divided are set.
  • the prediction block of the color difference signal, and for each prediction block of the color difference signal, predicts the color difference signal from the block of the surrounding encoded color difference signal according to the intra color difference prediction mode.
  • Intra-luminance prediction mode of a prediction block of the second luminance signal Intra-luminance prediction mode of a prediction block of the second luminance signal
  • Intra-luminance prediction mode of a prediction block of the third luminance signal is Intra-luminance prediction mode of a prediction block of the third luminance signal
  • Intra-luminance prediction mode of the prediction block of the fourth luminance signal is Intra-luminance prediction mode of the prediction block of the fourth luminance signal
  • the intra color difference prediction mode of the prediction block of the first color difference signal at the same reference position as the prediction block of the first luminance signal is the same reference position as the prediction block of the first luminance signal
  • the intra color difference prediction mode of the prediction block of the second color difference signal at the same reference position as the prediction block of the second luminance signal is the same reference position as the prediction block of the second luminance signal
  • the intra color difference prediction mode of the prediction block of the third color difference signal at the same reference position as the prediction block of the third luminance signal is the same reference position as the prediction block of the third luminance signal
  • the order of the intra chroma prediction modes of the prediction block of the fourth color difference signal at the same reference position as the prediction block of the fourth luminance signal is a coded string in which the information related to the prediction mode is arranged.
  • the first vector of the motion vector of the adjacent block is not subjected to scaling based on the temporal distance.
  • the second derivation method based on the temporal distance scaling is performed from the motion vector of the adjacent block
  • the candidate is derived.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

本发明提供的一种图像编码方法，包括以下步骤：生成步骤，将最小编码块的与预测模式相关的信息编码，并生成亮度信号的预测块的与帧内亮度预测模式相关的信息和色差信号的预测块的与帧内色差预测模式相关的信息的编码串；导出步骤，从相邻块的运动矢量导出在当前块的运动矢量的编码中使用的预测运动矢量的侯选；追加步骤，将导出的所述侯选追加到列表中；选择步骤，从追加了所述侯选的所述列表选择所述预测运动矢量；以及编码步骤，使用所述当前块的运动矢量及所述当前块的参照图片对所述当前块进行编码，并使用所选择的所述预测运动矢量对所述当前块的运动矢量进行编码。本发明能够在图像的编码中提高编码效率。

Description

一种图像编码方法 技术领域
本发明涉及图像处理技术领域，更具体地，涉及一种图像编码方法。
背景技术
在以往的图像编码方法中，有时无法得到充分高的编码效率。
发明内容
本发明的目的是提供一种图像编码方法，解决上述现有技术中的一个或者是多个。
本发明提供的一种图像编码方法，包括以下步骤：
生成步骤，将最小编码块的与预测模式相关的信息编码，并生成按上述最小编码块内的第1亮度信号的预测块的帧内亮度预测模式、
第2亮度信号的预测块的帧内亮度预测模式、
第3亮度信号的预测块的帧内亮度预测模式、
第4亮度信号的预测块的帧内亮度预测模式、
处于与第1亮度信号的预测块相同的基准位置的第1色差信号的预测块的帧内色差预测模式、
处于与第2亮度信号的预测块相同的基准位置的第2色差信号的预测块的帧内色差预测模式、
处于与第3亮度信号的预测块相同的基准位置的第3色差信号的预测块的帧内色差预测模式、
处于与第4亮度信号的预测块相同的基准位置的第4色差信号的预测块的帧内色差预测模式的顺序将与预测模式相关的信息排列后的编码串。
导出步骤，从相邻块的运动矢量导出在所述当前块的运动矢量的编码中使用的预测运动矢量的候选，该相邻块是包含编码对象的当前块的当前图片中包含的块，是与所述当前块相邻的块；
追加步骤，将导出的所述候选追加到列表中；
选择步骤，从追加了所述候选的所述列表选择所述预测运动矢量；以及
编码步骤，使用所述当前块的运动矢量及所述当前块的参照图片对所述当前块进行编码，并使用所选择的所述预测运动矢量对所述当前块的运动矢量进行编码；
在所述导出步骤中，
判定所述当前块的参照图片是长期参照图片还是短期参照图片、以及所述相邻块的参照图片是长期参照图片还是短期参照图片，
在判定为所述当前块的参照图片及所述相邻块的参照图片分别是长期参照图片的情况下，从所述相邻块的运动矢量，通过不进行基于时间距离的缩放的第1导出方式导出所述候选，
在判定为所述当前块的参照图片及所述相邻块的参照图片分别是短期参照图片的情况下，从所述相邻块的运动矢量，通过进行基于时间距离的缩放的第2导出方式导出所述候选。
在一些实施方式中，生成步骤之前还包括：
亮度信号帧内预测步骤，在对图像信号按预先设定的最小编码块单位进行帧内预测时，在设定有水平和垂直地分割亮度信号的分割模式的情况下，设定将上述最小编码块的亮度信号水平和垂直地分割后的第1～第4亮度信号的预测块，针对上述亮度信号的各个预测块，分别根据帧内亮度预测模式从周围的已编码的亮度信号的块预测亮度信号；
色差信号帧内预测步骤，在设定有上述分割模式、且色差格式为4：4：4的情况下，设定将上述最小编码块的色差信号水平和垂直地分割后的第1～第4色差信号的预测块，并针对上述色差信号的各个预测块，根据帧内色差预测模式从周围的已编码的色差信号的块预测色差信号。
本发明的有益效果为：能够在图像的编码中提高编码效率。
具体实施方式
本发明提供一种图像编码方法，下面结合具体实施方式，对本发明作详细介绍：
本发明提供的一种图像编码方法，包括以下步骤：
亮度信号帧内预测步骤，在对图像信号按预先设定的最小编码块单位进行帧内预测时，在设定有水平和垂直地分割亮度信号的分割模式的情况下，设定将上述最小编码块的亮度信号水平和垂直地分割后的第1～第4亮度信号的预测块，针对上述亮度信号的各个预测块，分别根据帧内亮度预测模式从周围的已编码的亮度信号的块预测亮度信号；
色差信号帧内预测步骤，在设定有上述分割模式、且色差格式为4：4：4的情况下，设定将上述最小编码块的色差信号水平和垂直地分割后的第1～第4色差信号的预测块，并针对上述色差信号的各个预测块，根据帧内色差预测模式从周围的已编码的色差信号的块预测色差信号。
生成步骤，将最小编码块的与预测模式相关的信息编码，并生成按上述最小编码块内的第1亮度信号的预测块的帧内亮度预测模式、
第2亮度信号的预测块的帧内亮度预测模式、
第3亮度信号的预测块的帧内亮度预测模式、
第4亮度信号的预测块的帧内亮度预测模式、
处于与第1亮度信号的预测块相同的基准位置的第1色差信号的预测块的帧内色差预测模式、
处于与第2亮度信号的预测块相同的基准位置的第2色差信号的预测块的帧内色差预测模式、
处于与第3亮度信号的预测块相同的基准位置的第3色差信号的预测块的帧内色差预测模式、
处于与第4亮度信号的预测块相同的基准位置的第4色差信号的预测块的帧内色差预测模式的顺序将与预测模式相关的信息排列后的编码串。
导出步骤，从相邻块的运动矢量导出在所述当前块的运动矢量的编码中使用的预测运动矢量的候选，该相邻块是包含编码对象的当前块的当前图片中包含的块，是与所述当前块相邻的块；
追加步骤，将导出的所述候选追加到列表中；
选择步骤，从追加了所述候选的所述列表选择所述预测运动矢量；以及
编码步骤，使用所述当前块的运动矢量及所述当前块的参照图片对所述当前块进行编码，并使用所选择的所述预测运动矢量对所述当前块的运动矢量进行编码；
在所述导出步骤中，
判定所述当前块的参照图片是长期参照图片还是短期参照图片、以及所述相邻块的参照图片是长期参照图片还是短期参照图片，
在判定为所述当前块的参照图片及所述相邻块的参照图片分别是长期参照图片的情况下，从所述相邻块的运动矢量，通过不进行基于时间距离的缩放的第1导出方式导出所述候选，
在判定为所述当前块的参照图片及所述相邻块的参照图片分别是短期参照图片的情况下，从所述相邻块的运动矢量，通过进行基于时间距离的缩放的第2导出方式导出所述候选。
以上所述的仅是本发明的一些实施方式。对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。

Claims (2)

  1. 一种图像编码方法，其特征在于，包括以下步骤：
    生成步骤，将最小编码块的与预测模式相关的信息编码，并生成按上述最小编码块内的第1亮度信号的预测块的帧内亮度预测模式、
    第2亮度信号的预测块的帧内亮度预测模式、
    第3亮度信号的预测块的帧内亮度预测模式、
    第4亮度信号的预测块的帧内亮度预测模式、
    处于与第1亮度信号的预测块相同的基准位置的第1色差信号的预测块的帧内色差预测模式、
    处于与第2亮度信号的预测块相同的基准位置的第2色差信号的预测块的帧内色差预测模式、
    处于与第3亮度信号的预测块相同的基准位置的第3色差信号的预测块的帧内色差预测模式、
    处于与第4亮度信号的预测块相同的基准位置的第4色差信号的预测块的帧内色差预测模式的顺序将与预测模式相关的信息排列后的编码串。
    导出步骤，从相邻块的运动矢量导出在所述当前块的运动矢量的编码中使用的预测运动矢量的候选，该相邻块是包含编码对象的当前块的当前图片中包含的块，是与所述当前块相邻的块；
    追加步骤，将导出的所述候选追加到列表中；
    选择步骤，从追加了所述候选的所述列表选择所述预测运动矢量；以及
    编码步骤，使用所述当前块的运动矢量及所述当前块的参照图片对所述当前块进行编码，并使用所选择的所述预测运动矢量对所述当前块的运动矢量进行编码；
    在所述导出步骤中，
    判定所述当前块的参照图片是长期参照图片还是短期参照图片、以及所述相邻块的参照图片是长期参照图片还是短期参照图片，
    在判定为所述当前块的参照图片及所述相邻块的参照图片分别是长期参照图片的情况下，从所述相邻块的运动矢量，通过不进行基于时间距离的缩 放的第1导出方式导出所述候选，
    在判定为所述当前块的参照图片及所述相邻块的参照图片分别是短期参照图片的情况下，从所述相邻块的运动矢量，通过进行基于时间距离的缩放的第2导出方式导出所述候选。
  2. 根据权利要求1所述的一种图像编码方法，其特征在于，生成步骤之前还包括：
    亮度信号帧内预测步骤，在对图像信号按预先设定的最小编码块单位进行帧内预测时，在设定有水平和垂直地分割亮度信号的分割模式的情况下，设定将上述最小编码块的亮度信号水平和垂直地分割后的第1～第4亮度信号的预测块，针对上述亮度信号的各个预测块，分别根据帧内亮度预测模式从周围的已编码的亮度信号的块预测亮度信号；
    色差信号帧内预测步骤，在设定有上述分割模式、且色差格式为4：4：4的情况下，设定将上述最小编码块的色差信号水平和垂直地分割后的第1～第4色差信号的预测块，并针对上述色差信号的各个预测块，根据帧内色差预测模式从周围的已编码的色差信号的块预测色差信号。
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