| US 7,595,841 B1 | ||
| Video image stabilization and registration—plus | ||
| David H. Hathaway, Huntsville, Ala. (US) | ||
| Assigned to The United States of America as represented by the Administrator of the National Aeronautics and Space Administration, Washington, D.C. (US) | ||
| Filed on Jul. 01, 2005, as Appl. No. 11/174,210. | ||
| Int. Cl. H04N 5/00 (2006.01); H04N 5/228 (2006.01) | ||
| U.S. Cl. 348—607 [348/208.99; 348/583; 382/295; 382/296] | 15 Claims |
| 1. A method of stabilizing a video image of interest displayed in multiple video fields of a video sequence, the method comprising
the steps of:
subdividing a selected area of a first video field into nested pixel blocks including multiple levels of progressively smaller
pixel block subdivisions, the area containing the video image;
determining horizontal and vertical translation of each of the pixel blocks in each of the pixel block subdivision levels
from the first video field to a second video field; and
determining translation of the image from the first video field to the second video field by determining a change in magnification
of the image from the first video field to the second video field in each of horizontal and vertical directions, determining
shear of the image from the first video field to the second video field in each of the horizontal and vertical directions,
and correcting from the first video field to the second video field the horizontal and vertical translations of each of the
pixel blocks in the smallest pixel block subdivision for the chance in magnification and shear of the image due to an object
being rotated toward or away from a camera, and averaging the corrected horizontal and vertical pixel block translations.
|