![Learn More
in
IIT Kharagpur's
First Online
Certificate Course on
Image and
Video Communication
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The motion estimation
- 1. The Motion Estimation Introduction & Principles
- 2. Digital Video • Video has been a major part of public consciousness for over 50 years. • Digital video compression plays an important role in the multimedia applications. • In order to manage large multimedia data objects efficiently, these data objects need to be compressed to reduce the size for storage .
- 3. Video Compression • Video Compression tries to eliminate the temporal redundancy between adjacent frames. • Once the redundancies are removed the object requires less memory space. So being smaller in size, it takes less time for transmission over the network. • This in turn significantly reduces storage and transmission costs.
- 4. INTRODUCTION • Motion estimation has proven to be effective in exploiting the temporal redundancy of video sequences and therefore forms a central part of all hybrid video compression standards. • Intuition suggests that moving pictures have a pixel conservation property -that pixels on one frame may be translated to form the pixel patterns on a subsequent frame.
- 5. ...INTRODUCTION • Images corresponding to objects on one frame move within the frame to form corresponding objects on the subsequent frame. • Temporal redundancy that exists between successive frames may be exploited in a number of ways. • The simplest method of exploiting temporal redundancy is frame differencing. • This strategy assumes that the average motion is small and simply compresses the pixel differences between two frames.
- 6. Principles of Motion Estimation • Motion estimation and motion compensated prediction is by far the most efficient and widely used technique for achieving the high levels of compression that are typified in modern video compression standards. • In this techniques, a scene or frame is divided arbitrarily into macroblock (MB) regions. The assumption is that each MB is composed of closely associated pixels.
- 7. Motion Compensation • During reconstruction, the reference frame is used to predict the current frame using the motion vectors. This technique is known as motion compensation. • During motion compensation, the macroblock in the reference frame that is referenced to by the motion vector is copied into the reconstructed frame.
- 8. Learn More in IIT Kharagpur's First Online Certificate Course on Image and Video Communication [Refer: http://goo.gl/hMyYWa ; [email protected]]