Image processing apparatus and method for detecting unique portions periodically distributed in a printed image
US9769352B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2016 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Jun 22, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus for performing a process of detecting a unique portion that occurs periodically in an inspection target image, includes: a dividing unit for dividing a part area of the inspection target image into a plurality of division areas; an averaging unit for changing a phase of the plurality of division areas in the part area and averaging pixel values in each of the plurality of division areas in each of changed phases; an addition unit for adding averaged values in each of the plurality of division areas in each of changed phases; and a setting unit for, with respect to a period λ with which the unique portion of a detection target appears, setting a size S of each of the plurality of division areas in a direction in which the unique portion may appear with the period λ, so as to meet S<λ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.