A new method is designed, firstly obtains TOA difference matrix from TOA series, then solves the inverse matrix, analyzes the TOA difference matrix’s special structure, and finally achieves the results of PRI recognition.

Fractal image encoding based on distance between difference matrix of blocks;

Reversible data hiding algorithm based on difference matrix of the original image is proposed in this paper, the property of central distributing of the elements in the difference matrix is used to generate the embedding space, the secret information is embedded through modifying the elements of the difference matrix, and this can be mapped to the modification of the pixels of the carrier.

It uses the property that the difference between adjacent pixels is always small and utilizes the difference matrix to do the original image preprocessing,amends and maps the margin matrix to the original image to realize information hiding.

This method first applied multi-directional correlation of DCT coefficient to construct difference neighboring correlation matrix,then extracted 48 dimensional features for each image,finally Support Vector Machine(SVM)was used to classify the cover and stego images.

TELESIS error matrixes correction of BESII.;

All errors of the simulation turntable are descripted with the bar error matrix and pair error matrix, and building procedure of the coordinate system of the simulation turntable is expounded.

An improved method of error matrix is used, and a simple method of error control is presented.

This paper improves the model based on the fuzzy optimum theory,which uses the difference matrix method to compare the reference project and other projects.

From finite field and difference matrix,two recursive constructions for external difference families are given and it is proved that there exists a(q,3×2,1)-external difference family for any prime power q≡1(mod 24).