Image processing apparatus, and method and computer-readable medium therefor
US10225436B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 2017 |
| Grant date | Mar 5, 2019 |
| Priority date | — |
| Expiry date | Aug 25, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus includes a controller configured to control an image scanner to scan a document sheet and generate target image data, generate an original histogram of an index value representing a luminance of each pixel forming the target image data, determine whether a particular condition is satisfied that includes a requirement that a difference value between an orientation of the document sheet and a reference orientation in the image scanning process is equal to or larger than a particular value, when the particular condition is satisfied, calculating a count of out-of-document pixels other than pixels representing an image of the document sheet, generate an adjusted histogram by subtracting at least a part of the count of the out-of-document pixels from frequencies of index values within a particular range in the original histogram, setting a specific threshold of the index value for binarization processing, based on the adjusted histogram.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.