Image size transforming apparatus, method and record medium storing image size transform program therein
US6826314B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2001 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Aug 19, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/4023
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image size transforming apparatus of the present invention comprises a DDA processing unit which expands or contracts an original image by the digital differential analysis (DDA) to create an expanded or contracted image, and an initial value setting unit which uses a random number based initial value as the sum total initial value for the digital differential analysis. Upon the image contraction, the DDA processing unit figures out the DDA sum total at the current pixel position by adding a contracted image size to the initialized DDA sum total, at the original image pixel initializing position, but to the DDA sum total figured out at the immediately previous pixel position, at the other pixel positions. If the DDA sum total is not less than the original image size, then the DDA processing unit copies pixels at the current pixel position onto a contracted image and defines the result of subtraction of the image size from the current DDA value as the DDA sum total at the next pixel position. If the DDA sum total is less than the original image size, then the DDA processing unit thins out the pixels at the current pixel position without copying them and defines the current DDA su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.