Sentence examples for coefficient of watermark from inspiring English sources

(4) Embed each mapped DCT coefficient of watermark in each pixel of block of original image.

(1) Use the reverse embedding procedure to extract the mapped DCT coefficients of watermark.

(2) Use the reverse embedding procedure to extract the DCT coefficients of watermark.

Then the reverse of linear transform that used in embedding process is used to create the DCT coefficients of watermark.

(2) The reverse of linear transform where used in embedding process is utilized to create the DCT coefficients of watermark.

The Asatryan's method use a reverse embedding procedure (in spatial domain) to extract the mapped DCT coefficients of watermark.

Thus, it leads to assertion that in general the proposed scheme has a satisfactory performance against StirMark attacks, especially BitChanger, Compressor, and LSBZero as depicted in Figure 4. Table 1 BER and correlation coefficient of extracted watermark attacked by StirMark Attacks Instrumental Jazz Classical CC in   BER CC BER CC BER CC [4] a. AddBrumm 1.90% 0.92 0.85%0.962.24%4% 0.91 0.98 b.

Then the estimation formulas are used to evaluate the AC coefficients of each DCT block (e.g., first five AC coefficients when ) of watermark and applied IDCT to create watermark in spatial domain.

In the Mohanty's method the used watermark is embedded into the original image by fusing the DCT coefficients of used watermark blocks with the corresponding blocks of the selected subimage.

Asatryan proposed another method that combines spatial and frequency domain to hide a grayscale watermark in grayscale original image by mapping the values of DCT coefficients of compressed watermark image to the interval [0,255] (max and min value of grayscale image) by a fixed linear transform and inserts these values in the original image [27].

Therefore, the many of embedded AC coefficients of used watermark are degraded after such attacks.