Ultrathin lens-free separable compression imaging system and calibration and reconstruction method thereof

Abstract

The invention provides an ultrathin lens-free separable compression imaging system and a calibration and reconstruction method thereof. The imaging system comprises a random coding aperture mask, an image sensor, a hollow box body with openings in the front end and the rear end and a non-transparent fixing plate, and the random coding aperture mask is arranged at the opening in the front end of the hollow box body in a sealed and covered mode; the image sensor and the hollow box body are both fixed on the opaque fixing plate, and the image sensor is located in an opening in the rear end of the hollow box body. Imaging is achieved by adopting the random coding aperture, the luminous flux is improved to the maximum extent, the thickness, the size and the weight of an imaging system are greatly reduced, cost is reduced, and the advantages of being compact in structure, light, thin and low in cost are achieved; besides, according to the separable compressive sensing theory, the separable matrix is applied to the measurement matrix of the imaging system, the difficulty of calibration and reconstruction of the imaging system is remarkably reduced, and the method has the advantages of optical implementation and feasible calculation.

Description

technical field [0001] The invention relates to the technical field of coded aperture imaging, in particular to an ultra-thin lensless separable compression imaging system and a calibration and reconstruction method thereof. Background technique [0002] Existing imaging systems are generally lens-based imaging systems, which are affected by factors such as the number of lenses, thickness, and focusing space, and have problems such as large size, high price, cumbersome assembly, and limited installation space. For example, lens-based imaging systems The system's lenses for visible light can be made from inexpensive materials such as glass and plastic, but lenses for the infrared and ultraviolet spectrum are very expensive; lens-based imaging systems always require assembly, reducing manufacturing efficiency. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an ultra-thin lensless detachable compression imaging syst...

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Problems solved by technology

[0002] The existing imaging systems are generally lens-based imaging systems, which are affected by factors such as the number of lenses, thickness, and focusing space, and have problems such as large volume, high price, cumbersome assembly, and limited installation space. For example, lens-based imaging systems System lenses for visible light can be made from inexpensive materials such as glass and plastic, but lenses for the infrared and ultraviolet spectrum are very expensive; lens-based imaging systems always require assembly, reducing manufacturing efficiency

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