The present application discloses a Three Dimensions (3D) video conversion system and method, and a key frame selection method and apparatus thereof. The key frame selection method includes: after the i th key frame is determined, calculating feature matching ratios of video frames after the i th key frame in a 2D video; selecting video frames each of which has a feature matching ratio within the range of T 1 ˆ¼ T 2 as candidate key frames; selecting a video frame from the candidate key frames as the ( i +1)th key frame according to re-projection errors of the candidate key frames. Since key frames are selected according to the feature matching ratios of video frames to the previous key frame, and the later key frame is selected according to the re-projection errors of the candidate key frames. Thus the selection for key frames is more reasonable, and the 2D to 3D video conversion based on more reasonable key frames may improve converted 3D video quality.
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机译：本申请公开了三维（3D）视频转换系统和方法，以及关键帧选择方法和装置。关键帧选择方法包括：确定第i个关键帧后，计算2D视频中第i个关键帧之后的视频帧的特征匹配率;选择每个视频帧的特征匹配率在T 1 ˆ¼ T 2范围内，作为候选关键帧;根据候选关键帧的重投影误差，从候选关键帧中选择视频帧作为第（i + 1）个关键帧。由于根据视频帧与前一个关键帧的特征匹配率来选择关键帧，并且根据候选关键帧的重投影误差来选择后一个关键帧。因此，关键帧的选择更加合理，并且基于更合理的关键帧的2D到3D视频转换可以提高转换后的3D视频质量。
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