The motion vector for standard MPEG motion compensation is associated to
fixed blocks of size 16*16. In many situations, the moving objects are not described
by these blocks. In this thesis, we hope to remove this restriction by searching and
modifying the motion vectors for moving objects with non-block shape. There are
three stages in our motion compression: segmentation of the moving object,
modified motion compensation, and Huffman coding for the difference.
The first stage is most important part in our work. The major concepts of our
segmentation are based upon optical flow segmentation and modification by
morphological filtering. Displacement information is important in dynamic image
analysis. The method of optical flow has been well applied to compute the
displacement in the field of computer vision. We apply the method of optical flow to
compute the displacement information and then segment the image by the
displacement vectors. This segmented image is further improved by morphology
operations, opening and closing. Our modified motion compensation is focus on the
segmented moving objects. Therefore, the required coding information for moving
object is only the motion vector associated to the motion objects. The shapes of
motion objects are obtained from prediction.
Experiments have demonstrated that our coding efficiency is inferior to the
standard MPEG by 32 %. This is probably we do not have our optimized Huffman
coding for the difference coding after motion compensation.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0906106-155336 |
| Date | 06 September 2006 |
| Creators | Peng, Chien-Chang |
| Contributors | none, none, none, none |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906106-155336 |
| Rights | not_available, Copyright information available at source archive |
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