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Full Hadamard matrix coding imaging method

A technology of matrix coding and imaging method, which is applied in the coding field of coding imaging, can solve the problem that the signal-to-noise ratio is not increased enough, and achieve the effect of solving the unrealizable and increasing the signal-to-noise ratio

Active Publication Date: 2018-10-02
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the problem that the existing cyclic matrix encoding method does not increase the signal-to-noise ratio sufficiently, the present invention proposes a full Hadamard matrix encoding imaging method, which indirectly realizes the theoretically optimal encoding matrix encoding and further improves the signal-to-noise ratio. Compare

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Embodiment

[0041] Step 1: Build the optical path of the imaging system. The optical path of the imaging system is a common optical path. The light enters the optical path from the objective lens, and then irradiates the digital micromirror device DMD through lens focusing. The digital micromirror device DMD modulates the optical path according to the encoding method of Hadamard positive matrix and Hadamard negative matrix. , through the focusing lens to focus on the single-point detector, the signal of the single-point detector is transmitted to the PC for calculation after the signal processor, and the image is reconstructed.

[0042] Step 2: After the optical path is built, use matlab to calculate and generate Hadamard positive matrix and Hadamard negative matrix. Hadamard positive matrix and Hadamard negative matrix can choose different matrix orders according to the situation. In this embodiment, a 256-order matrix is ​​used for encoding, and the 256-order Hadamard matrix H 256 As ...

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Abstract

The invention provides a full Hadamard matrix coding imaging method. Two elements such as +1 and -1 in a Hadamard matrix are respectively extracted through matrix operations, the Hadamard matrix is divided into a Hadamard positive matrix and a Hadamard negative matrix which can be realized in an optical path, and image signals are coded by using the Hadamard positive matrix and the Hadamard negative matrix; and subtraction is performed between a measured value obtained by the coding of the Hadamard positive matrix and a measured value obtained by the coding of the Hadamard negative matrix in decoding, and then an image is reconstructed through matrix operations. The method realizes the Hadamard matrix in optical path modulation and greatly improves the imaging sensitivity and signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of weak signal detection and imaging, and in particular relates to an encoding method for encoding imaging. Background technique [0002] Encoded imaging solves the problem of detection and imaging of low-light signals. Coded imaging uses digital micromirror device DMD to perform pixel-level combined measurement of image signals in the optical system, and the code matrix that controls the flipping of digital micromirror device DMD determines the combined measurement method. [0003] At present, the widely used encoding matrix is ​​a circulant matrix, which is transformed from the Hadamard matrix. However, the optimal encoding matrix in theory is Hadamard matrix. Hadamard matrix is ​​composed of +1 and -1 elements, which cannot be realized in the actual optical path, while the circular matrix is ​​composed of +1 and 0 elements, which is easy to realize in the actual optical path, so Currently, circulant mat...

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/80
Inventor 韩静吴传奇岳江张毅柏连发
Owner NANJING UNIV OF SCI & TECH
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