A STEGANOGRAPHIC METHOD FOR IMAGES BY PIXEL-VALUE DIFFERENCING PDF

Wu Abstract [[abstract]]A new and efficient steganographic method for embedding secret messages into a gray-valued cover image is proposed. In the process of embedding a secret message, a cover image is partitioned into non-overlapping blocks of two consecutive pixels. A difference value is calculated from the values of the two pixels in each block. All possible difference values are classified into a number of ranges. The difference value then is replaced by a new value to embed the value of a sub-stream of the secret message.

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Wu Abstract [[abstract]]A new and efficient steganographic method for embedding secret messages into a gray-valued cover image is proposed. In the process of embedding a secret message, a cover image is partitioned into non-overlapping blocks of two consecutive pixels. A difference value is calculated from the values of the two pixels in each block. All possible difference values are classified into a number of ranges. The difference value then is replaced by a new value to embed the value of a sub-stream of the secret message.

The number of bits which can be embedded in a pixel pair is decided by the width of the range that the difference value belongs to. The method is designed in such a way that the modification is never out of the range interval. This method provides an easy way to produce a more imperceptible result than those yielded by simple least-significant-bit replacement methods.

The embedded secret message can be extracted from the resulting stego-image without referencing the original cover image. Moreover, a pseudo-random mechanism may be used to achieve secrecy protection. Experimental results show the feasibility of the proposed method. Dual statistics attacks were also conducted to collect related data to show the security of the method Topics: Steganography; Data hiding; Cover image; Stego-image; Security Publisher: Asia University.

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A Steganographic Method Based on Pixel-Value Differencing and the Perfect Square Number

If that condition is satisfy, then this block is called an error block and it is not used to embed secret data. OPVD method embeds the secret data bits using singular pixels rather than embedding in pixel pairs using least significant bit LSB substitution. If the difference value of the pixel pair before and after embedding the secret data bits belongs to the same range, then the embedding procedure is implemented. Otherwise, there is no embedding for secret bits and the second pixel is adjusted. Despite the fact that this method conceals more secret data bits than PVD, its embedding capacity is limited since it still has a large number of unused pixels in embedding process.

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Published01 Jul Abstract The pixel-value differencing PVD scheme uses the difference value between two consecutive pixels in a block to determine how many secret bits should be embedded. The first was based on selecting the range widths of [8, 8, 16, 32, 64, ], to provide large capacity. The second was based on selecting the range widths of [2, 2, 4, 4, 4, 8, 8, 16, 16, 32, 32, 64, 64], to provide high imperceptibility. Most of the related studies focus on increasing the capacity using LSB and the readjustment process, so their approach is too conformable to the LSB approach. There are very few studies focusing on the range table design.

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