Camera calibration and distance measurement using parallel lines
US12373972B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2023 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Jan 31, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30244
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Example implementations include a method, apparatus and computer-readable medium for estimating a real world distance in an image, comprising obtaining an image from a camera installed in an environment and identifying, in the image, a first set of parallel lines on a real world ground plane and a second set of parallel lines on the real world ground plane. The implementations include determining a first intersection point of the first set of parallel lines and a second intersection point of the second set of parallel lines, identifying a ground line connecting the first intersection point and the second intersection point, and estimating an internal camera matrix based on a focal length and an image size associated with the camera. The implementations include calibrating the camera for real world distance measurement by determining a perpendicular vector to the ground line based on the internal camera matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.