Abstract: The present disclosure provide a volume display method and apparatus for smoothly and flexibly displaying a volume change on the premise of ensuring high time effectiveness and accuracy. The method includes: acquiring a volume value of a first audio input during a current time cycle and a volume value of a second audio input during a previous time cycle; determining volume values to be displayed according to the volume values of the first audio input and the second audio input as well as a volume unit or a threshold of the quantity of volume values to be displayed; determining, according to the quantity of the volume values and duration of the time cycle, a unit display time of volume values to be displayed; sequencing all volume values to be displayed; and successively displaying an image that corresponds to each volume value on a device screen according to the unit display time and the sequence.

Abstract: 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 ith key frame is determined, calculating feature matching ratios of video frames after the ith key frame in a 2D video; selecting video frames each of which has a feature matching ratio within the range of T1˜T2 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.