Two-dimensional random sequence generation circuit used for compressed sensing CMOS image sensor

Abstract

The invention provides a two-dimensional random sequence generation circuit used for a compressed sensing CMOS image sensor and a working method of the two-dimensional random sequence generation circuit. The two-dimensional random sequence generation circuit comprises a row linearity feedback shift register, a column linearity feedback shift register, a flip-flop and a logic gate, wherein the row linearity feedback shift register is used for generating a pixel row random number and transmitting the pixel row random number to the flip-flop through a shift method; the column linearity feedback shift register is used for generating a pixel column random number and transmitting the pixel column random number to the flip-flop through the shift method; the flip-flop provides an input signal for the logic gate based on the received pixel row random number or / and the pixel column random number; and the logic gate realizes corresponding digital logic based on the input signal and generates all random numbers for the whole pixel array. Through adoption of a method of combining the linearity feedback shift registers and the common shift register, the random sequence generation circuit, which has the advantages of adjustable sequence, optional mode, random (two-dimensional) row and column, low complexity and convenience for hardware implementation, is realized. The two-dimensional random sequence generation circuit is simple in structure and has wide application prospect in the field of design of the compressed sensing CMOS image sensor.

Description

technical field [0001] The invention belongs to the field of CMOS image sensor design, and in particular relates to a two-dimensional random sequence generating circuit and a working method thereof for compressed sensing CMOS image sensors. Background technique [0002] Random sequence sequences are widely used in communication systems, information security, financial modeling, economics simulation and molecular dynamics and other fields. In addition, in the compressed sensing imaging process, in order to randomly read the pixel array, the random sequence generation circuit becomes an important part of it. [0003] The research on software-based random sequence generators has a long history. Scientists in related fields at home and abroad have proposed a variety of pseudo-random sequence generation methods, including linear congruence method, nonlinear congruence method, shift register sequence generator, composite prime number generator and combination generator and so on....

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Problems solved by technology

[0008] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of two-dimensional random sequence generation circuit and working method thereof for compressed sensing CMOS image sensor, for solving the problem of random sequence generation in compressed sensing CMOS image sensor. The problem is that a random number generation circuit with adjustable sequence, optional mode, random rows and columns (two-dimensional), low complexity and easy hardware implementation is realized by using the method of combining linear feedback shift register and ordinary shift register.

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