Title:
MOIRE PATTERN REMOVAL METHOD AND APPARATUS FOR TEXT IMAGE, AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/078285
Kind Code:
A1
Abstract:
Disclosed in the present invention are a moire pattern removal method and apparatus for a text image, and an electronic device. The method comprises the following steps: converting a text image into a grayscale image, and performing normalization processing, so as to obtain a grayscale image matrix; sequentially performing a two-dimensional Fourier transform and spectrum translation on the grayscale image matrix, so as to obtain a translational spectrum matrix; performing binarization processing on the translational spectrum matrix, so as to obtain an energy spectrum mask matrix; performing a morphological closing operation on the energy spectrum mask matrix, and marking connected regions; acquiring the coordinates and the quantity of all the connected regions, and performing exponential filtering on all the connected regions other than a maximum connected region, so as to obtain a new energy spectrum mask matrix; performing point multiplication on the new energy spectrum mask matrix and the translational spectrum matrix, so as to obtain a reconstructed spectrum matrix; sequentially performing spectrum translation and an inverse Fourier transform on the reconstructed spectrum matrix, so as to obtain a reconstructed grayscale image; and performing nonlinear stretching transformation on the reconstructed grayscale image, so as to obtain a final processed image. The method does not depend on a training data set, such that the calculation amount can be reduced, and text information can be effectively protected.
Inventors:
DENG YUANCE (CN)
Application Number:
PCT/CN2022/129187
Publication Date:
May 11, 2023
Filing Date:
November 02, 2022
Export Citation:
Assignee:
CIENET TECH BEIJING CO LTD (CN)
International Classes:
G06T5/00
Foreign References:
| CN114022383A | 2022-02-08 | |||
| CN111383186A | 2020-07-07 | |||
| CN111383189A | 2020-07-07 | |||
| CN108389164A | 2018-08-10 | |||
| JP2014174803A | 2014-09-22 |
Attorney, Agent or Firm:
BEIJING GENIUS ESSEN INTELLECTUAL PROPERTY OFFICE (CN)
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