A sub-pixel super-resolution imaging system and method based on translationally adjustable wavefront coding

Abstract

The invention relates to a sub-pixel super-resolution imaging system and method based on translational adjustable wavefront coding. The system comprises an imaging lens, a composite phase mask, an image detector and an image processing unit arranged in sequence along an optical axis transmission direction. A composite phase mask is formed by superposing two identical phase components along the optical axis, and the two identical phase components can be translated independently in the x-direction and y-direction. Where x and y belong to [-1, 1] represent normalized aperture coordinate; Two identical phase components are two classical cubic phase components or two generalized cubic phase components. The invention not only reduces the aliasing of the original image data for sub-pixel super-resolution reconstruction, At that same time, the point spread function (PSF) require for the restoration of the original image can be effectively matched with the equivalent sample interval of the high-resolution mesh, and the high-quality super-resolution restoration image quality can be obtain while the super-depth-of-field effect of the wavefront coding is taken into account.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a sub-pixel super-resolution imaging system and method based on translational adjustable wavefront coding. Background technique [0002] Sub-pixel dislocation sampling imaging technology is an effective means to improve the resolution without changing the physical size of the detector pixel, and has been widely used in aerospace, aviation, scientific research and commercial fields. [0003] The sub-pixel dislocation sampling imaging technology was proposed by the French National Space Technology Research Center and applied to the SPOT-5 satellite camera for the first time. Encapsulate two linear array CCDs with a half-pixel displacement in the track-crossing direction in the same chip, acquire two images with a half-pixel displacement from each other at the same time and perform fusion processing to achieve super-resolution imaging. According to reports, this proces...

AI Technical Summary

Problems solved by technology

[0006] First of all, in the existing sub-pixel imaging technology, the original resolution image used still has aliasing effect;

[0007] Second, the point spread function used to restore sub-pixel fused images on a high-resolution grid does not match the equivalent sampling interval

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