Interpolated frame acquisition method and device in video frame rate conversion

The invention relates to the field of video processing, and discloses an interpolated frame acquisition method and an interpolated frame acquisition device in video frame rate conversion. The interpolated frame acquisition method comprises the following steps of: dividing an interpolated frame to be solved into a plurality of large blocks; estimating bilateral motion vectors of the large blocks; decomposing the large blocks into a plurality of interpolated small blocks; estimating bilateral motion vectors of the interpolated small blocks by taking the motion vectors of the large blocks as predicted values; after acquiring the motion vectors of the interpolated small blocks of the whole frame, interpolating according to the motion vectors of the interpolated small blocks to acquire the interpolated frame. By hierarchically estimating motion vectors which need interpolated blocks, the accuracy of the motion vectors of the interpolated blocks can be improved, and errors of replacement of objects by backgrounds a