Removal of shadows from document images while preserving fidelity of image contents
US10559067B2 · kind B2 · utility
1Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2018 |
| Grant date | Feb 11, 2020 |
| Priority date | — |
| Expiry date | Oct 13, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20032
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques are disclosed for generating a shadow map of a digital image. In some examples, a method may include generating a shadow mask of a digital image, generating a dilated de-noised binarized gradient image based on the shadow mask, generating a binarized median-filtered gray image based on the digital image and the dilated de-noised binarized gradient image, and generating a shadow map based on the shadow mask and the binarized median-filtered gray image. The generated shadow map can then be used to remove shadows from the digital image without degrading the quality of the image content in the digital image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.