109 results about "Matrix encoding" patented technology

The invention discloses an image hiding and authentication method based on secret sharing, and belongs to the technical field of secret image sharing. The image hiding and authentication method is characterized by comprising the steps that firstly, difference Huffman encoding is conducted on a secret image, every three generated bit sequences are set to be one group to be converted into decimal numbers which are used as coefficients of a sharing polynomial in the Shamir (k, n) threshold scheme, the k and the n are positive integers, the k is smaller than or equal to the n, and n shadow images are generated; secondly, n significant carrier images are selected, the generated shadow images are embedded into the carrier images in a matrix encoding mode, authentication bits generated by the hash function are also embedded into the carrier images, and n disguise images are formed and are in the charge of n different participants respectively. The disguise images generated through the image hiding and authentication method has higher visual quality, existence of secret information cannot be perceived by attackers easily, and the safety of the secret information is ensured. Meanwhile, before the secret information is recovered, the disguise images provided by each participant need to be authenticated, only the disguise images passing through authentication can participate in recovery of the secret information, and the safety of the secret information is further strengthened.

The invention relates to a tail-biting staircase code coding method. The tail-biting staircase code coding method comprises the following steps: 1) selecting an (n, k) linear block code as a component code, wherein n represents a code length, n belongs to (500, 5000), and k represents an information length before coding; and 2) grounding received information according to a mode in staircase codes, constructing a matrix B<1>, B<2>, B<3>, ..., B<n>, adding a full-zero matrix participating the coding to a lower part of B<1>, coding the residual matrix using the component code then, generating a check bit matrix while the coding, completing end-to-end connection of codes of a final matrix and a first matrix in a group then, finally replacing the full-zero matrix complemented in the B<1> with the check bit matrix, and completing the coding. The coding method is advantageous in that, through adoption of the novel coding scheme, the novel tail-biting staircase codes have a characteristic of the block code, coding processes between groups are mutually independent, information of each matrix in the groups is still contained in the two component codes, and error correction performance is guaranteed.

The invention relates to a digital holography ghost imaging system by adopting a single-pixel or bucket detector and a working method thereof. The system comprises a digital holography recording unit, a hologram writing / reading unit, a computational ghost imaging unit and a system control and signal processing unit, wherein the digital holography recording unit generates a hologram of a target object and the hologram serves as writing light to be written in the hologram writing / reading unit; and the computational ghost imaging unit generates structured light which can be dynamically refreshed and carries reference matrix encoding information, and the structured light serves as reading light to read the hologram, and the hologram is received by the single-pixel or bucket detector. The method of the invention combines the ghost imaging and the digital holography, and the problems that the size of the target surface of a plane array photoelectric detector and the resolution are insufficient and plane array photoelectric detectors of certain wave bands are hard to make as a result of limitations such as the material and the technology in the digital holography technology applications can be solved.

The invention discloses a hamming code plus one-based information hiding method of an HEVC video. The method comprises the steps as follows: using a (1, 3,2 ) matrix encoding algorithm in steganography code to combine with an LSBMR algorithm to form a hamming code plus one algorithm, modifying a prediction mode according to three-bit secret information to be embedded to finish information embedding, embedding the three-bit secret information in four continuous 4X4 intra-frame luminance blocks. The hamming code plus one-based information hiding method of the invention not only ensures hiding capacity, but also reduces the impact that the video quality is reduced because of modifying the prediction mode to ensure the subjective and objective quality of the video well, and greatly reduces the impact of embedded secret information to a video bitstream. By analyzing an HEVC coding and decoding structure, modulating the predication node in an intra-frame prediction coding process as the predication node which meets an embedding condition and whose rate-distortion cost is the smallest in terms of a predication unit whose size is 4 plus 4, and using a Lagrange rate-distortion mode to adaptively select the type of the prediction unit of the coding unit, the secret information hiding manner could well ensure the subjective and objective quality of the video.

The method for encoding and / or decoding video signals, includes the operations of generating at a transmitter side a multiple descriptions vector associated to a pixel values vector of the video signals and decoding at a receiver side available descriptions vector for reconstructing the pixel values vector. The operation of generating a multiple descriptions vector includes the steps of obtaining the pixel values vector by selecting a group of pixels in a picture of the video signal and applying an encoding matrix to the pixel values vector. The decoding operation includes the step of applying a decoding matrix that is in an inverse relationship with the encoding matrix to the available descriptions vector to obtain the pixel values vector.

A method to audio matrix encode / decode, which encode and decode audio signals of two or more channels into an audio signal of one or more channel while preserving the direction of a sound image includes extracting pieces of sound image information from audio signals of multi channels, encoding and allocating the extracted sound image information to an inaudible frequency domain except an audible frequency domain, and adding the sound image information allocated to the inaudible frequency domain and matrix-encoded stereo signals of the audible frequency domain.

The invention discloses an animal ear tag matrix encoding identification method and device, and relates to the technical field of computers. The method comprises the following steps of: obtaining an image of an encoding region of animal tags; carrying out white-black binary processing on the image of the encoding region; determining the number of lines and number of rows of an encoding matrix in the encoding area after the binary processing by utilizing a protection segmentation algorithm; carrying out grid generation on the encoding region according to the determined number of lines and number of rows; and decoding the encoding matrix according to pixel values of pixel points in each grid, and identifying information of animals included in the encoding matrix. According to the method, the images of the encoding region of the animal tags is acquired, and the encoding matrix of the encoding region is divided and decoded by utilizing the projection segmentation method, so that the reading of animal tag matrix codes is realized; and the method is strong in university, is suitable for various devices capable of acquiring and processing images, is simple and convenient to apply, and can carry out real-time decoding to realize decoding during shooting.

The invention discloses an image steganography method and system for automatically learning distortion based on a GAN network structure, and the method comprises the steps: inputting an enhanced carrier image into a preset improved U-Net network, sequentially generating an initial pixel change probability graph and an initial secret-containing image, inputting the initial secret-containing image into a discrimination network, and obtaining a discrimination result, calculating the loss of the discrimination network according to the discrimination result, calculating a total loss function of the generative network according to the discrimination result and the current steganography capacity, optimizing the generative adversarial network by taking minimization of the loss function as a target, when the loss is reduced and kept stable, considering that the training is ended, extracting the generative network from the generative adversarial network after the training is ended, and inputting a to-be-transmitted original image into the generative network to obtain a pixel change probability, calculating embedded distortion corresponding to the pixel change probability, and coding the secret information and the to-be-transmitted original image by adopting a syndrome matrix coding technology according to the embedded distortion to obtain a steganographic image corresponding to the original image.

The invention provides an error compensation method of an absolute code disc in a matrix encoding manner, and relates to the fields of photoelectric measurement and automatic control. The error compensation method disclosed by the invention solves the problem that the absolute code disc is insufficient in the capability of processing error codes. The error compensation method comprises the following steps: 1, reading a corresponding code value by utilizing a four-quadrant absolute code disc; 2, adopting a reading head of which the outermost circle has a difference of 90 degrees, and reading a value of an incremental code disc through a processing circuit of the incremental code disc; 3, setting a threshold, and calculating the difference of the two code values; 4, replacing the absolute code value exceeding the preset threshold with the corresponding incremental code value. According to the error compensation method disclosed by the invention, a real-time detection method is adopted, the original structure of the matrix encoding disc is utilized, and only a counting circuit structure of the incremental code disc is additionally added, so that the jump variation of the code value due to various factors can be compensated, the advantages of an absolute manner and an incremental manner are merged, the contradiction of the decoding of high code values and the size of the code disc is solved in a certain extent, and the added circuit is simple and reliable, and is convenient to maintain.