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Fig. 1 | SpringerPlus

Fig. 1

From: Blind data hiding technique using the Fresnelet transform

Fig. 1

The first row show the magnitude of the Fresnelet coefficients applied to the USAF target image as shown in Fig. 2 with key parameter \( d_{1} = 1\;{\text{m}} \). a The approximation data, b the horizontal detail data, c the vertical detail data, d the diagonal detail data. The second row e, f, g, and h represents the zoomed-in views of the marked areas of the corresponding images in the first row. The last row i, j, k, and l shows the corresponding magnitude of the inverse Fresnelet transformed data from the four subbands of the images in the first row with key parameter \( d_{2} = 0.01\;{\text{cm}} \)

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