Method and device for writing and reading digital watermark

A technology of digital watermarking and digital encoding, applied in image watermarking, image data processing, image data processing, etc., to achieve the effect of enhancing robustness and security

Active Publication Date: 2020-08-28
ADVANCED NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at the current stage, the above digital methods have certain defects in terms of security, visual impact, etc.

Method used

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  • Method and device for writing and reading digital watermark
  • Method and device for writing and reading digital watermark
  • Method and device for writing and reading digital watermark

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0188] According to an implementation manner, the candidate ring determining unit 122 is configured to:

[0189] forming a square whose side length is twice the predetermined radius in the second picture, and determining that the inscribed circle of the square is surrounded by the first candidate circle;

[0190] The square is moved, thereby determining a second alternative ring.

[0191] In one embodiment, the code set forming unit 126 is configured to: add the at least one set of digital codes to the candidate digital code set.

[0192] In another embodiment, the code set forming unit 126 is configured to: determine the digital code with the highest repetition degree in the at least one set of digital codes, and add it to the set of candidate digital codes.

[0193] According to a possible design, the picture code determining unit 127 is configured as:

[0194] Among multiple sets of digital codes included in the set of candidate digital codes, the digital code with the hi...

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PUM

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Abstract

Provided in the embodiments of the description are a digital watermark writing method and reading method. The writing method comprises: first, reading a first picture to obtain a bit set for recording a pixel value, corresponding to each pixel point; then, acquiring a picture identification code generated for the first picture; in addition, dividing the first picture into a plurality of blocks of a predetermined size, and for each block, determining a first annulus of a predetermined radius in the block; next, writing a predetermined symbol code in predetermined least significant bits (LSBs) of bit sets corresponding to a first number of pixel points, starting from a pixel point corresponding to a predetermined position on the first annulus, along the first annulus; and after the first number of pixel points, continuing to successively write, along the first annulus, the picture identification code in an LSB corresponding to each pixel point covered by the first annulus. The reading method corresponds to the writing method.

Description

technical field [0001] One or more embodiments of this specification relate to the field of image processing and encryption, and in particular to methods and devices for writing and reading spatial digital watermarks. Background technique [0002] With the development of computer and network technology, it is becoming more and more convenient for people to obtain various resources. But subsequently, this also provides space for stealing and distributing content created by others without the author's consent. For example, there are many original picture resources on Taobao and Tmall platforms, which are the hardest hit areas for picture infringement. How to protect these original pictures and prevent these picture resources from being stolen is an urgent need. [0003] In order to protect the copyright of the picture, a watermark is often added to the picture in the conventional technology, for example, a logo of the copyright party of the picture is added. However, such an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021G06T1/005
Inventor 傅佳琪贾冰鑫毛仁歆
Owner ADVANCED NEW TECH CO LTD
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