Image resize using sinc filter in linear lumen space
US5771317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1996 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Jun 10, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
a scanner which converts an oversampled substrate image into a digital pixel array which may be at an arbitrary sampling frequency lower than the first sampling frequency. The scanner sensor converts the substrate image into an array of analog pixel at a first sampling frequency. Preferably the first sampling frequency substantially oversamples the image from the actual frequency desired in the final digital image. The analog pixels are converted into a first array of digital pixels. The first digital pixel array is converted by a sinc filter in the linear lumen domain, i.e. the digital pixels are linearly representative of the brightness of light sensed by the sensor, to a second array of pixels at a second sampling frequency. The second sampling frequency should be much lower than the first sampling frequency to produce high quality images with substantially fewer pixels than required by the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.