Method of embedding watermark into digital image

• US 7,697,717 B2
• Filed: 04/18/2006
• Issued: 04/13/2010
• Est. Priority Date: 03/28/2001
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Redkov, Viktor V., Smolentsev, Sergey V., Sall, Mikhail A., Mayboroda, Alexander Leonidovich, Tikhotsky, Anatoli I.
• Primary Examiner(s): Seth; Manav
• Application Number:
  US11/405,608
• Publication Number:
  US 20060188129A1
• Time in Patent Office: 1,456 Days
• Field of Search: 382/100, 382232-254
• US Class Current: 382/100
• CPC Class Codes: G06T 1/0028 Adaptive watermarking, e.g. Human Visual System [HVS]-based watermarking
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 1/0057 Compression invariant watermarking
• CPC Class Codes: G06T 2201/0061 Embedding of the watermark in each block of the image, e.g. segmented watermarking
• CPC Class Codes: G06T 2201/0202 whereby the quality of watermarked images is measured; Measuring quality or performance of watermarking methods; Balancing between quality and robustness

Abstract

Methods of embedding and detecting a watermark into-from a digital image are disclosed. A method of embedding a watermark in accordance with an embodiment of the present invention into a digital image, the method comprising: generating a difference from an original image; segmenting said difference image into sub-regions; and calculating a watermark block into each sub-region by adding said watermark block with pixel values of each sub-region.

Claims

1. A method of embedding a watermark into a digital image, the method comprising:

generating a predicted image of an original image by using a linear predictor;

generating a difference image by subtracting the predicted image from an original image or vice versa;

segmenting the difference image into sub-regions;

calculating a watermark block for each of the sub-regions; and

embedding the watermark block into each of the sub-regions by adding the watermark block with pixel values of each of the sub-regions.

2. The method of claim 1, wherein the calculating a watermark block, comprises:

calculating a watermark amplitude for each of the sub-regions or each pixel of each of the sub-regions;

performing a channel coding process on a set of watermark data bits; and

generating a pseudo random sequence (PRS) for embedding the watermark.

3. The method of claim 2, wherein the watermark amplitude is calculated by using any one of a block scale mode, a pixel scale mode and an adaptive scale mode.

4. The method of claim 3, wherein a best value of the scale parameter by iterations is chosen of the adaptive scale mode is used.

5. The method of claim 2, wherein the performing of the channel coding process and the generating of the pseudo random sequence are used for decreasing a number of bits, which can be written into an image.