Image processing apparatus for preventing occurrence of moire in output image
US5337162A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1992 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Jun 25, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40075
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus in which a multilevel image signal generated from an original image by a scanner is input and processed so as to produce multilevel image data describing a gray level of each pixel of an output image, includes a detection part for repeatedly detecting a peak of a multilevel image signal generated by a scanner and a valley thereof with respect to pixels of the original image aligned in a scanning direction of the scanner, and for outputting the peak of the multilevel image signal and the valley thereof, and a correction part for correcting a gray level of the multilevel image data with respect to each of the pixels depending on a difference between the peak and the valley, so as to reduce changes in gray level of pixels of the output image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.