Apparatus with reduction/magnification image size processing for producing low-pass filtered images
US5365277A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 1993 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Oct 8, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for filtering an input digital image comprising: first storage apparatus for storing the input digital image; apparatus for retrieving the input digital image from the first storage apparatus and generating a first resized digital image of reduced spatial frequency relative to the input digital image and being of smaller size than the input digital image; second storage apparatus for storing the first resized digital image; apparatus for retrieving the first resized digital image from the second storage apparatus and generating a second resized digital image of equal size to the input digital image, wherein the second resized digital image is a lowpass filtered version of the input digital image due to the reduced spatial frequency of the first resized digital image; and third storage apparatus for storing the second resized digital image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.