公开(公告)号：US10148948B1

公开(公告)日：2018-12-04

申请号：US15198480

申请日：2016-06-30

Applicant: GOOGLE INC.

Inventor： Ronald Sebastiaan Bultje ,  Daniel Kang

IPC: H04N11/02 ,  H04N19/103 ,  H04N19/61 ,  H04N19/44 ,  H04N19/147 ,  H04N19/176 ,  H04N19/122

Abstract: A method for decoding an encoded video bitstream includes generating a decoded frame by decoding a current frame from the encoded video bitstream. The decoding of the current frame may include decoding, from the encoded video bitstream, a transform mode for the current frame, identifying the transform mode for a current block of the current frame on a condition that the transform mode for the current frame is a per-block transform mode, using the transform mode for the current frame as the transform mode for the current block on a condition that the transform mode for the current frame is a per-frame transform mode, identifying a prediction mode for the current block, and generating a decoded block for the current block using the prediction mode and the transform mode for the current block.

公开(公告)号：US09438915B1

公开(公告)日：2016-09-06

申请号：US14976438

申请日：2015-12-21

Applicant: Google Inc.

Inventor： Ronald Sebastiaan Bultje ,  Daniel Kang

IPC: H04N11/02 ,  H04N19/122 ,  H04N19/593 ,  H04N19/60 ,  H04N19/44 ,  H04N19/86 ,  H04N19/107 ,  H04N19/176 ,  H04N19/147 ,  H04N19/567

CPC classification number: H04N19/122 ,  H04N19/107 ,  H04N19/147 ,  H04N19/176 ,  H04N19/44 ,  H04N19/567 ,  H04N19/593 ,  H04N19/60 ,  H04N19/86 ,  H04N19/90

Abstract: Blocks of a frame of a video stream can be encoded using various prediction modes followed by transforming the predicted blocks. Increasing coding efficiency may be achieved by indicating a default transform mode in a frame header. The default transform mode is a maximum transform size for all blocks of the frame or a per-block transform mode that determined the transform size on a per-block basis. For encoded blocks of the frame, identify a prediction mode is identified by inspecting a block header of a current encoded block, the block header of the current encoded block is inspected if the default transform mode is the per-block transform mode so as to identify a transform size for the current encoded block, and otherwise the transform size for the current encoded block is the maximum transform size, and the current encoded block is decoded using the prediction mode and the transform mode.

Abstract translation: 可以使用各种预测模式对视频流的帧的块进行编码，随后变换预测块。 可以通过在帧头中指示默认变换模式来实现增加编码效率。 默认变换模式是帧的所有块的最大变换大小，或每个块确定变换大小的每块变换模式。 对于帧的编码块，通过检查当前编码块的块标题来识别预测模式，如果默认变换模式是每块变换模式，则检查当前编码块的块标题，以便识别 用于当前编码块的变换大小，否则当前编码块的变换大小是最大变换大小，并且使用预测模式和变换模式对当前编码块进行解码。