In this section, the differences and excellences of proposed method with two related methods [24, 27] are introduced in four conventional different steps of watermarking methods: (1) selecting embedding area procedure, (2) watermark creation procedure, (3) inserting procedure, (4) extracting procedure.
The algorithm is divided into four parts: block selection, watermark creation,watermark embedding and watermark extraction, which are described in Sections 2.1 2.4, respectively.
Next, all AC coefficients are changed to zero. Figure 7 The watermark creation procedure.
For creation of compound watermark, the synthetic image is created by Gaussian and Laplacian random number generator.
The original content is projected successively onto lower-dimensional subspaces in order to ease the creation of the watermark signal (see Sections 2.2 and 2.3).
For watermark creation process, as shown in Figure 7, the original grayscale watermark image is divided into (e.g., ) nonoverlapping blocks and subsequently performing the DCT on each block.
Block size of watermark Watermark creation procedure (2) Create synthetic image by using DCT coefficients of most perceptually important subimage of original image and Gaussian/Laplacian distribution for DC, AC coefficients, respectively.
Check 'Include watermark' in the 'Watermark' section.
It's one of the first songs that I wrote, probably within the first dozen songs I wrote, and it happened at the dawning of my own creation as a songwriter but also at a very low watermark in my life.
It is now possible to produce digital facsimiles of the four folios that the library proposes to sell at a high enough resolution to see every correction, revision and blot, even down to the nature of the paper stock and its watermarks (issues which are crucial in providing clues to the book's creation, and hence its potential meaning).
