Phase mask and wavefront encoding imaging system capable of adjusting the quality of intermediate encoding images

Abstract

The invention relates to a phase mask plate and a wavefront coding imaging system capable of adjusting the quality of an intermediate coding image. A phase mask function of the phase mask plate is formed by overlaying two exponential functions with the relative displacement, the expression of the one-dimensional function is Q(x)=alpha (x+m) exp (beta (x+m)<2>)+alpha (x+n) exp (beta (x+n)<2>), in the expression, the alpha, beta, m and n are parameters of the phase distribution function respectively, x is a normalized coordinate, the value range of the x is [-1, 1], and the value range of the offset amount of m and the value range of the offset amount of n are respectively [-1, 1]. The phase mask plate which can help to effectively expand the system field depth, adjust the quality of the intermediate coding image and obtain the better rehabilitation filter effects and the wavefront coding imaging system capable of adjusting the quality of the intermediate coding image are provided.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a phase mask and a wavefront encoding imaging system capable of adjusting the quality of an intermediate encoding image. Background technique [0002] The depth of field of extended optical systems has always been a hotspot in academic research. Since the mid-1980s, although various methods have been proposed for depth of field expansion, it was not until Dr. Dowski and Professor Cathey of the University of Colorado in the United States proposed the wavefront in 1995. After the concept of coding, the extension of depth of field had a real breakthrough. [0003] Taking the one-dimensional optical system as an example, its defocus optical transfer function OTF can be obtained through the autocorrelation operation of the generalized pupil function, as follows: [0004] H ( u , W 20 ) ...

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Problems solved by technology

However, the physical scene to be imaged may be very complex. For example, a slightly defocused target does not need to excessively suppress the intermediate coded defocus modulation transfer function (the corresponding intermediate coded image has a small degree of blur), while a severely defocused target needs to introduce a larger The decline of the modulation transfer function (corresponding to a large degree of blurring of the intermediate coded image)

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