Detecting upscaled source video
US10382516B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2017 |
| Grant date | Aug 13, 2019 |
| Priority date | — |
| Expiry date | Jun 28, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques are disclosed for estimating a source resolution of image data presented to a system. According to these techniques, input image data may be converted to a domain of frequency coefficients. Each coefficient may represent content of the input image along a respective pair of frequencies extending in two dimensions. For each set of frequency coefficients having a common frequency in one of the dimensions, zero crossings of coefficient values may be detected. The zero crossings may be counted at each frequency position in the second dimension. An estimate of the input image's source resolution may be estimated from a comparison of the zero crossings. For video, this process may be performed across images of an input video sequences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.