Methods and apparatus for re-scaling image by variable re-scaling factor
US7542053B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2005 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Jan 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/4084
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method includes receiving a sequence of samples that represents a row of pixels in an image. The method further includes selecting a re-scaling factor for at least a portion of the row of pixels. The method further includes selecting a filter from a bank of low pass filters based on the selected re-scaling factor, and low-pass filtering the sequence of samples with the selected filter. The method further includes up-sampling the low-pass-filtered sequence of samples by a factor M with a polyphase filter bank having a windowed sinc(t) characteristic to the up-sampled sequence of samples, and down-sampling the polyphase-filtered sequence of samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.