There is provided an electronic watermark generating apparatus including an appliance characterizing information generating unit that generates appliance characterizing information that characterizes an electronic appliance, by using physical data acquired by a sensor that measures characteristics of the electronic appliance, an electronic watermark generating unit that generates, in relation to the appliance characterizing information, electronic watermark information that is used for detecting whether information has been tampered with or not, an embedded position deciding unit that analyzes the appliance characterizing information, and decides an embedded position for the electronic watermark information in the appliance characterizing information, and an electronic watermark embedding unit that embeds the electronic watermark information generated by the electronic watermark generating unit in a position on the appliance characterizing information decided by the embedded position deciding unit.

Electronic watermark generating apparatus, electronic watermark verifying apparatus, method of generating electronic watermark, and method of verifying electronic watermark

The invention discloses a method for hiding high-capacity compression-resisting image information. According to the method, firstly, a carrier image is sampled and is decomposed to acquire sub-images which are same in size and do not mutually overlap; secondly, several sub-images are preferentially selected from the sub-images and serve as carrier sub-images, and the rest of the sub-images serve as source images used for carrier recovery. Firstly, encoding and scrambling are conducted on embedded information; secondly, one or more digits among four high digits in the carrier sub-images are hidden with a foundational hiding method, and sub-images which contain secret information and sub-images which do not contain secrete information are reconstructed to form an image which contains secret information to be transmitted; received images are decomposed by a receiving end, the secret information is extracted from the sub-images which contain the secret information, and the sub-images which do not contain the secret information are predicted in an interpolation mode to recover carrier images. The method has the advantages of being large in hiding capacity, strong in compression-resisting capability and low in complexity, can recover the secret information and the carrier images in a high-quality mode under the condition of achieving two-time compression to eight-time compression of a JPEG2000 algorithm, wherein the maximum relative hiding capacity can reach one eighth and the typical value of the PSNR of carrier image recovery is 40dB.

Method for hiding high-capacity compression-resisting image information

The invention discloses an embedding method and an extracting method of reversible watermarks, belonging to the technical field of digital watermarks. The embedding method comprises the following steps of: sequentially reading the pixel values of digital images, and establishing a position sign sequence; compressing the position sign sequence, and regulating a pixel with the pixel value of 0 or 255; calculating forecast error sequences of the digital images, and selecting internal areas and parameters T which are needed in the embedding process; and embedding the reversible watermarks according to the selected parameters. The extracting method comprises the following steps of: sequentially reading the pixel values of the digital images, and extracting various kinds of auxiliary information; uncompressing the compressed position sign sequence to obtain the uncompressed position sign sequence; carrying out inverse solution referring to the embedding parameters so as to obtain embedding information; regulating the pixel values according to the position sign sequence; and finally, sequentially substituting the sequences for least significant bits of the pixel values, wherein carrier images can be completely recovered at the time. The invention can successfully realize the embedding and the extraction of the reversible watermarks on gray level images and the recovery of original images.

Embedding method and extracting method of reversible watermarks

The invention discloses a method for embedding and extracting a reversible watermark of a digital image. The method comprises the following steps of: blocking a carrier image, judging the block types by utilizing a statistical relation between a surrounding block and a target block, adaptively selecting capacity parameters, performing block compression sensing, embedding a watermark by utilizing integer transform, embedding the watermark into a smooth and common carrier image block subjected to compression sensing for improving the watermark embedding capacity, wherein the complex carrier image block is not processed, so that the image quality and the imperceptibility are ensured; and finally, restoring the carrier image by adopting a block compression reconstructing algorithm and the reversible integer transform.

Method for embedding and extracting reversible watermark of digital image

The invention is applied to the technical field of information hiding, and provides a method, terminal and server for realizing screen digital watermarks. The method comprises the following steps: receiving a sensitive data reading request; judging whether the digital watermarks exit in sensitive data or not; and if not, generating the sensitive data having the digital watermarks aiming at the sensitive data according to user watermark information of a user, and reading the sensitive data having the digital watermarks, wherein the user watermark information comprises a vector diagram set with vector diagrams respectively corresponding to each character in a user character set; and the user character set is a character set distributed to the user by the server. According to the embodiment of the invention, the digital watermarks are generated aiming at the sensitive data according to the vector diagrams in the vector diagram set; the digital watermarks are generated by adopting the vector diagrams; furthermore, the vector diagrams can be composed of pixel points according to a pre-set rule; namely, only few pixel points can be replaced by the vector diagrams after being added onto the sensitive data; and thus, display of the sensitive data cannot be influenced by the vector diagrams.

Method, terminal and server for realizing screen digital watermarks

The invention relates to a method for embedding a reversible watermark in a digital image and a method for extracting the reversible watermark from the digital image, and belongs to the field of information technology The method for embedding the reversible watermark comprises the following steps of: dividing a carrier image and establishing a location mark sequence LMC, and dividing all pixels into three parts of I1, I2, and I3; embedding watermark in the pixel blocks in the I1 and I3; recording the lowest effective bit in the I1 into a sequence C, and using the LMC to replace the lowest effective bit in the I1; and finally, embedding the sequence C into an embeddable pixel block in the I2 The method for extracting the reversible watermark comprises the following steps of: dividing the carrier image and extracting the location mark sequence LMC; then dividing the pixel blocks into three parts of I1, I2, and I3; performing reverse transformation on the pixel blocks in the I2 according to the LMC to obtain an original pixel value sequence C; replacing the lowest effective bit in the I1 by the value in the sequence C; and finally, performing reverse transformation on the pixel blocks in the I1 and I3 according to the LMC to acquire an original pixel value and embedded watermark information The method for embedding the reversible watermark in the digital image and the method for extracting the reversible watermark from the digital image improve the embedding capacity and do not need the original images during extraction

Method for embedding reversible watermark in digital image and method for extracting reversible watermark from digital image

The invention discloses a method for embedding and extracting a watermark in a digital image, and belongs to the technical field of information hiding and image hidden writing. The watermark embedding method comprises the following steps of: de-noising a primary digital image to obtain a de-noised image; and then matching a binary watermark to be embedded and a pixel value of the primary digital image, and finally changing the pixel value of the primary image according to the pixel value of the corresponding de-noised image so as to realize watermark embedding. The watermark extracting method comprises a step of sequentially extracting lowest significance bits according to the acquired pixel value of the watermark image to acquire watermark information. Compared with the prior art, the noise of the watermark image is lower after the pixel value of each point is changed, and hidden writing analysis can be resisted better.

Method for embedding and extracting watermark in digital image

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Method for embedding reversible watermark in digital image and method for extracting reversible watermark from digital image

Embedding method and extracting method of reversible watermarks

Method for embedding and extracting watermark in digital image