Image processing method and image processing device

An image processing device, comprising:

• a motion estimation processor configured to perform the following operations:
• downsizing a current frame and a reference frame;
• dividing the down-sized current frame into a plurality of first current blocks;
• dividing the down-sized reference frame into a plurality of first reference blocks;
• performing a first motion estimation to the plurality of first current blocks and the plurality of first reference blocks to generate a plurality of first motion vectors each corresponding to one of the first current blocks;
• dividing the current frame into a plurality of second current blocks;
• dividing the reference frame into a plurality of second reference blocks;
• performing a second motion estimation to the plurality of second current blocks and the plurality of second reference blocks to generate a plurality of second motion vectors each corresponding to one of the second current blocks, wherein the second motion estimation comprises:
• performing a 3D recursive search for each of the plurality of second current blocks;
• and
• adjusting a plurality of estimation parameters in the 3D recursive search according to the first motion vectors;
• a motion compensation frame rate converter coupled to the motion estimation processor and configured to generate a compensated frame between the current frame and the reference frame according to the plurality of second motion vectors.