Multispectral light-field camera

Abstract

The invention provides a multispectral light-field camera. Along a light path direction, the camera comprises a light filter array, a main imaging lens, a micro lens array, combined sub-lenses, a detector and a signal processing system, which are sequentially arranged. An imaging method comprises the steps that: the light filter array is arranged on a pupil plane of the main imaging lens, and information of various target spectral bands is introduced with a pore size division method; with the micro lens array positioned on an image plane of the main imaging lens, the multispectral information is spatially separated; the combined sub-lenses are introduced, such that micro lens focal plane is secondarily transferred to a detector photosensitive surface; and the signal processing system calculates the data obtained by the detector, and spectral images of different wavebands are extracted and obtained. With the camera provided by the invention, multispectral information of each pixel in a full field of view can be obtained, dynamic multispectral imaging can be realized, and system structure is stable.

Description

technical field [0001] The invention relates to the technical field of spectral imaging, in particular to a multi-spectral light field camera. Background technique [0002] Multispectral imaging technology has been developed since the early 1970s, and has developed with the needs of earth observation, space exploration, military and civil affairs. Since the concept of the imaging spectrometer was proposed by the Jet Propulsion Laboratory of the California Institute of Technology, contemporary multispectral remote sensing technology has developed rapidly. In 2000, Zhang Chunmin, Xiang Libin and Zhao Baochang proposed the space-time mixed modulation polarization interference imaging spectroscopy technology, proposed the steady state polarization interference imaging spectrometer based on Savart polarizer and the steady state large field of view polarization interference imaging spectrometer related technologies, and carried out Through theoretical research, as well as the dev...

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Problems solved by technology

[0004] However, the existing multi-spectral cameras mostly adopt the method of time-sharing detection, using rotating filters, adjusting liquid crystal modulators or acousto-optic modulators, and sequentially collecting image information of multiple spectral segments within a period of time. The disadvantage is that the instrument needs external intervention to adjust the internal moving parts to change its working spectrum during the working process. Its delay makes it impossible to detect in real time, and it is impossible to perform dynamic video detection on moving targets, and the mechanical structure of the instrument is complex and reliable. and less stable

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