公开(公告)号：US20150264361A1

公开(公告)日：2015-09-17

申请号：US14657744

申请日：2015-03-13

Applicant: Huawei Technologies Co., Ltd.

Inventor： Thorsten Laude ,  Jorn Ostermann ,  Marco Munderloh ,  Haoping Yu

IPC: H04N19/172 ,  H04N19/136 ,  H04N19/119

CPC classification number: H04N19/543 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176 ,  H04N19/46 ,  H04N19/93

Abstract: Coding of screen content includes identifying corresponding areas in one or more previously coded frames to code unchanged areas in current frames. An unchanged area in a current frame is coded by copying a corresponding area from a previously coded frame or several previously coded frames. Usage of a copy mode to be applied to the unchanged areas is signaled in an encoding bitstream. The copy mode can be signaled for each unchanged area or a single copy mode is signaled for a group of unchanged areas. The copy mode can be automatically applied to one or more unchanged areas contiguous to the group of unchanged areas without further signaling the copy mode. Copying the corresponding area from the previously coded frame includes copying palette entries from the previously coded frame. Palette entries copied from the previously coded frame are reordered according to frequency of appearance.

Abstract translation: 屏幕内容的编码包括识别一个或多个先前编码的帧中的相应区域，以对当前帧中的不变区进行编码。 通过从先前编码的帧或多个先前编码的帧复制相应的区域来对当前帧中的未改变的区域进行编码。 将复制模式应用于不变区域的使用在编码比特流中被通知。 可以针对每个不变的区域发信号通知复制模式，或者为一组不变的区域发信号通知一个复制模式。 可以将复制模式自动应用于与该组未改变区域相邻的一个或多个不变区域，而不进一步发信号通知复制模式。 从先前编码的帧复制相应的区域包括从先前编码的帧中复制调色板条目。 从先前编码的帧复制的调色板条目根据外观频率重新排列。