Motion robust depth estimation using convolution and wavelet transforms
US8624986B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2011 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Jul 20, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20064
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for electronically estimating focusing distance between a camera (still and/or video camera) and a subject. Images at different focal positions of a calibration target are collected to arrive at a focus matching model for a given imaging apparatus. In operation, at least two images are captured and convolutions performed which approximate the modeling of blur change as a point spread function. Wavelet transforms are applied to the images after each convolution and images are compared based on the wavelet variance differences to provide a motion robust blur difference determination. Applying the blur differences to the focus matching model provides an estimate of focusing distance, which can be utilized such as for controlling camera focus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.