H04N 19/51 - Definition 
Definition statement
This subclass covers:
Details of disparity estimation and compensation in stereoscopic or multi-view video coding are also covered in this subgroup and in its subgroups.
For a synopsis of motion estimation techniques in video coding, see the figure below.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Picture signal circuitry for video frequency region, e.g. for movement detection in television systems not related to digital video coding | H04N 5/14 |
Conversion of standards for analogue television systems, e.g. at pixel level involving interpolation processes involving the use of motion vectors | H04N 7/01 |
Analysis of motion by image analysis in general | G06T 7/20 |
Glossary of terms
In this subclass, the following terms or expressions are used with the meaning indicated:
| 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. |
| Global motion estimation | Process to estimate the part of motion in a video sequence caused by camera motion, e.g. background motion by panning or zooming. |
| Multiresolution motion estimation | Motion estimation performed on the same picture of a video sequence at different spatial sampling resolutions (coarse-to-fine: starting from the lowest resolution; fine-to-coarse: starting from the highest resolution). |
| Block-based matching motion estimation | Classic motion estimation based on the search of a best matching block in a reference frame. |
| Occlusion | A part of background or of a foreground object that is hidden in one frame and then uncovered in a following frame. |
| (Motion) Search window | A region in a reference frame, where the search for the block or feature best matching the current block or feature is performed. |
Synonyms and Keywords
In patent documents the following abbreviations are often used:
| MV | Motion Vector |
| GMV | Global Motion Vector |
| MAE | Mean Absolute Error |
| MAD | Mean Absolute Difference |
| SAD | Sum of Absolute Differences |
| MSE | Mean Squared Error |
| CCF | Cross-Correlation Function |
| PDC | Pixel Difference Classification |
| DFD | Displaced Frame Difference |
In patent documents the following terms "reference frame" and "anchor frame" are often used as synonyms. Also, these terms can be used as keywords.