Image self-embedding semi-fragile watermark method and system based on block truncation coding
The invention discloses an image self-embedding semi-fragile watermark method based on block truncation coding. The method comprises the following steps of: watermark generation and embedding: firstly, carrying out block-level two-level division on an image, and respectively generating image blocks...
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Main Authors | , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
17.12.2021
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Subjects | |
Online Access | Get full text |
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Summary: | The invention discloses an image self-embedding semi-fragile watermark method based on block truncation coding. The method comprises the following steps of: watermark generation and embedding: firstly, carrying out block-level two-level division on an image, and respectively generating image blocks with the granularity of 4 * 4 and 2 * 2; then, carrying out compression coding on each 4 * 4 image block by utilizing block truncation coding to generate a recovery watermark of a 2 * 2 image block, and carrying out Hash on the recovery watermark to generate an authentication watermark of the 2 * 2 image block; finally, cascading the recovery watermark and the authentication watermark to form a self-embedded watermark, and embedding the self-embedded watermark into a 4 * 4 mapping block; tampering authentication and recovery: firstly, comparing a watermark extracted from a certain 4 * 4 image block with a watermark generated by the block, and judging whether a 2 * 2 sub-block of the image block passes authenticatio |
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Bibliography: | Application Number: CN202110902850 |