Howtosignalprocessing
- What are motion vectors used for?
- What is motion vector in video?
- Why is motion estimation used?
- What is the need for block motion estimation?
What are motion vectors used for?
Motion vectors are typically used to compress video by storing the changes to an image from one frame to the next. We use these vectors creatively to detect and track motion and to find an alternative to traditional video decoding using phase shifting.
What is motion vector in video?
motion vector: a two-dimensional vector used for inter prediction that provides an offset from the coordinates in the decoded picture to the coordinates in a reference picture.
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.
What is the need for block motion estimation?
The block-based motion estimation algorithm is mainly aimed to estimate the motion (motion vector) between macro block of current frame and perfectly matched candidate block of reference frame. The simple matching criterion is sum of absolute difference (SAD).
