Sentence examples for block of watermark from inspiring English sources

(3) The extracted DC coefficients are used to estimate the AC coefficients of each DCT block of watermark.

But in proposed method a reverse embedding procedure is performed to extract the only DC coefficients of each DCT block of watermark.

Then, number of blocks of original image with highest are selected for embedding watermark image, where is the size of DCT block of watermark.

Finally, DC value of each DCT block of watermark image is embedded in DC value of DCT block of original image by using the output of the DFIS.

The Mohanty's method use a reverse embedding procedure to extract the DCT coefficients of each DCT block of watermark and applied IDCT to create watermark in spatial domain.

In the extraction process, DCT is applied on the test image to extract the DC coefficients of each DCT block of watermark and the AC coefficients of each DCT block of extracted watermark are estimated based on proposed technique by Veeraswamy and Kumar [4] to construct the watermark with higher quality.

Finally, the values and estimation formulas as described in Section 2.2 are used to create the DCT blocks of watermark then by performing Block-wise inverse DCT, watermark in spatial domain is created.

The embedding block diagram is plotted in Figure 7. Figure 7 Block diagram of watermark insertion.

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.

By adding a watermark bit block to, a block of watermarked wavelet coefficients is obtained.

The proposed creation watermark procedure is acceptable because the watermark image that creates by only DC coefficients of each (where ; e.g., ) DCT block of original watermark is perceptually similar as original one.