Global motion estimation

1. What is global motion estimation?
2. Why is motion estimation used?
3. How many approaches are categories for motion estimation?
4. What are the general methodologies in 2 d motion estimation of video processing?

What is global motion estimation?

Global motion estimation (GME) is a technique that attempts to map one image onto another with a simple four-corner pin. This differs from local motion estimation (LME), which attempts to find where each individual pixel in the image is in the other image.

Why is motion estimation used?

Motion estimation is an important process in a wide range of disciplines and applications, such as image sequence analysis, computer vision, target tracking, and video coding. Different disciplines and applications have different requirements and may, therefore, use different motion estimation techniques.

How many approaches are categories for motion estimation?

Second, they represent two different approaches to motion estimation (pel-based and block-based, respectively).

What are the general methodologies in 2 d motion estimation of video processing?

There are two mainstream techniques of motion estimation: pel-recursive algorithm (PRA) and block-matching algorithm (BMA).