Image processing methods and apparatus
US8417021B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2006 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Oct 12, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30264
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
We describe methods of characterizing a set of images to determine their respective illumination, for example for recovering the 3D shape of an illuminated object. The method comprises: inputting a first set of images of the object captured from different positions; determining frontier point data from the images, this defining a plurality of frontier points on the object and for each said frontier point a direction of a normal to the surface of the object at the frontier point, and determining data defining the image capture positions; inputting a second set of images of said object, having substantially the same viewpoint and different illumination conditions; and characterizing the second set of images said frontier point data to determine data comprising object reflectance parameter data (β) and, for each image of said second set, illumination data (L) comprising data defining an illumination direction and illumination intensity for the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.