CN105737985A - Digital zooming spectrum imager based on microlens array sensor - Google Patents
Digital zooming spectrum imager based on microlens array sensor Download PDFInfo
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- CN105737985A CN105737985A CN201610302380.3A CN201610302380A CN105737985A CN 105737985 A CN105737985 A CN 105737985A CN 201610302380 A CN201610302380 A CN 201610302380A CN 105737985 A CN105737985 A CN 105737985A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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Abstract
The invention discloses a digital zooming spectrum imager based on a microlens array sensor. The digital zooming spectrum imager based on the microlens array sensor comprises an electronic control band-pass optical filter, an optical imaging lens, a microlens array sensor and an image collecting and processing terminal. The microlens array sensor is adopted to decompose image information, pixel improvement is performed on collected optical information of graphs, optical information of each spectrum image can be obtained when a spectrum imaging system performs spectrum image time series scanning, and a digital zooming function that exposure imaging is performed before focusing is realized. According to the invention, the digital zooming spectrum imager based on the microlens array sensor does not need to carry out zooming manipulation for remote sensing application and can be applied for spectrum imaging remote sensing of a complex landform, the obtaining of spectrum image information of the complex landform is ensured to the greatest extent, the definition of the image information is guaranteed, and the accuracy of the spectrum information is guaranteed.
Description
Technical field
The present invention relates to spectral imaging technology field, specifically refer to a kind of digital zoom type optical spectrum imagers based on microlens array sensor.
Background technology
Spectrum imaging system can obtain image and the spectral information of target simultaneously, it it is the optical pickocff of a kind of " performance is complete ", collection of illustrative plates unification, current optical spectrum imagers can realize that adjustable band is many, spectral resolution strong and spatial resolution advantages of higher, it is properly applied to the remote sensing fields such as airborne, spaceborne of staring imaging, the new technique means of mineral resource reconnaissance, biomedical diagnostic, agricultural pest monitoring etc. are provided for relevant departments.But in actual remote sensing application, due to the topography and geomorphology skewness of remote sensing object, in order to obtain remote sensing images clearly, it is necessary to carry out zoom manipulation according to topography and geomorphology.Based in the spectral imaging technology of bandpass filter, spectral information is to carry out sequence scanning by bandpass filter, there is bigger conflicting with the zoom manipulation requiring time for controlling.
Current spectrum imaging system, when complicated topography and geomorphology is carried out remote sensing, exists that definition is low, the problem of distortion.
Summary of the invention
It is an object of the invention to provide a kind of digital zoom type optical spectrum imagers based on microlens array sensor, the problem conflicted with the zoom manipulation existence requiring time for controlling by solving bandpass filter in prior art to carry out sequence scanning, reach when complicated topography and geomorphology is carried out remote sensing, can obtain and become apparent from and image information and spectral information more accurately, expand the major function of existing optical spectrum imagers and the purpose of range of application.
The purpose of the present invention is achieved through the following technical solutions:
A kind of digital zoom type optical spectrum imagers based on microlens array sensor, including:
Electric control belt pass filter: the light of object under test, after the filtration of electric control belt pass filter, is sent to optical imaging lens；
Optical imaging lens: for the target light source received being converted to optical imagery and being transported to microlens array sensor；
Microlens array sensor: the light from object under test sequentially passes through the focal plane of electric control belt pass filter, optical imaging lens arrival microlens array sensor, the space pixel that the final spectrum picture of microlens array sensor acquisition is corresponding provides corresponding spatial frequency field information, and is transferred to image acquisition and processing terminal；
Image acquisition and processing terminal: carry out imaging processing according to the spatial frequency field information collected, form image.
The optical spectrum imagers of the present invention, the light that object under test sends is after the filtration of electric control belt pass filter, it is sent to optical imaging lens and carries out optical imagery, then the image of optical imagery is carried out through microlens array sensor the collection of image information, obtain the spatial image information of object under test and the field information of each pixel simultaneously, it is transferred to image acquisition and processing terminal, image processing terminal utilizes the field information of each pixel to carry out digital zoom manipulation, the extraction to different distance place object picture rich in detail can be realized in the light spectrum image-forming data of single exposure collection.This method is not while affecting sequential light spectrum image-forming function, utilize the light field spectral image information that simple Digital Image Processing function and microlens array sensor provide, achieve the manipulation of the digital zoom after single exposure imaging, improve the spectrum imaging system function to complex landform, the far and near clear light spectrum image-forming of object.The present invention adopts microlens array sensor to carry out the decomposition of image information, can while spectrum imaging system spectrum picture sequence scanning, obtain the field information of each spectrum picture, the digital zoom functions focused after realizing first exposure image, this optical spectrum imagers based on microlens array sensor is made without zoom manipulation when remote sensing application；Overcome manipulation contradiction of the prior art, and based on the digital zoom type spectrum imaging system of microlens array sensor, can apply to the light spectrum image-forming remote sensing application of complicated topography and geomorphology, the acquisition of complicated topography and geomorphology spectral image information is ensure that on to greatest extent, both ensure the definition of the outer image information of optical lens focusing area, ensure again the accuracy of spectral information.
Microlens array sensor includes microlens array dough-making powder imaging detector, and optical imaging lens and surface imaging detector form conjugation relative to microlens array.Concretely, by optical imaging lens and surface imaging detector are formed conjugation relative to microlens array, namely optical imaging lens is positioned on the object plane of microlens array, and surface imaging detector is positioned in the image plane of microlens array；Surface imaging detector is divided into and unit microlens subregion one to one by microlens array, and the spatial resolution of final image is consistent with the number of unit of microlens array；The surface imaging detector subregion split by unit microlens provides the spatial frequency field information of correspondence for the space pixel that final spectrum picture is corresponding.
Described microlens array is the K*K lens matrix being arranged to make up by lenticule, the natural number of K ∈ [50,20].Further, in actual experiment and theory analysis process, it is found by the applicant that the matrix unit quantitative relation of microlens array is to the definition of image and digital zoom manipulation scope, through experiment and the analysis of up to ten thousand times, applicant have determined that a relatively reasonable matrix scope, when lenticule is arranged in the matrix of 5*5～20*20, imaging definition and zoom manipulation scope are higher.
The present invention compared with prior art, has such advantages as and beneficial effect:
A kind of digital zoom type optical spectrum imagers based on microlens array sensor of 1 present invention, microlens array sensor carries out the decomposition of image information, obtain the field information of spatial image information and each pixel, it is achieved the clear digital image of different distance place object simultaneously；Can while spectrum imaging system spectrum picture sequence scanning, obtain the field information of each spectrum picture, the digital zoom functions focused after realizing first exposure image, this optical spectrum imagers based on microlens array sensor is made without zoom manipulation when remote sensing application；Overcome manipulation contradiction of the prior art, and based on the digital zoom type spectrum imaging system of microlens array sensor, can apply to the light spectrum image-forming remote sensing application of complicated topography and geomorphology, the acquisition of complicated topography and geomorphology spectral image information is ensure that on to greatest extent, both ensure the definition of image information, ensure again the accuracy of spectral information；
A kind of digital zoom type optical spectrum imagers based on microlens array sensor of 2 present invention, optical imaging lens and surface imaging detector form conjugation relative to microlens array, namely optical imaging lens is positioned on the object plane of microlens array, and surface imaging detector is positioned in the image plane of microlens array；Surface imaging detector is divided into and unit microlens subregion one to one by microlens array, and the spatial resolution of final image is consistent with the number of unit of microlens array；The surface imaging detector subregion split by unit microlens provides the spatial frequency field information of correspondence for the space pixel that final spectrum picture is corresponding.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is principles of the invention frame structure schematic diagram；
Fig. 2 is the single-point pixel field information recording principle schematic diagram of the present invention；
Fig. 3 is the multipoint digital zoom operation principle schematic diagram of the present invention.
Labelling and corresponding parts title in accompanying drawing:
1-object under test, 2-electric control belt pass filter, 3-optical imaging lens, 4-microlens array sensor, 401-microlens array, 402-surface imaging detector, 5-image acquisition and processing terminal, the red object point to be measured of 6-, the green object point to be measured of 7-, the blue object point to be measured of 8-.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and exemplary embodiment and the explanation thereof of the present invention are only used for explaining the present invention, not as a limitation of the invention.
Embodiment
As shown in Figure 1, a kind of digital zoom type optical spectrum imagers based on microlens array sensor of the present invention, including electric control belt pass filter 2, optical imaging lens 3, microlens array sensor 4 and image acquisition and processing terminal 5, wherein microlens array sensor 4 is made up of microlens array 401 dough-making powder imaging detector 402；Wherein, light from object under test 1 sequentially passes through electric control belt pass filter 2, optical imaging lens 3 arrives the focal plane of microlens array sensor 4, shown in light in Fig. 1, object under test 1 is imaged on the position of microlens array 401 through optical imaging lens 3, and namely microlens array 401 is in the image plane of optical imaging lens 3；Optical imaging lens 3 and surface imaging detector 402 form conjugation relative to microlens array 401, and namely optical imaging lens 3 is positioned on the object plane of microlens array 401, and surface imaging detector 402 is positioned in the image plane of microlens array 401；Surface imaging detector 402 is divided into and unit microlens subregion one to one by microlens array 401, and the spatial resolution of final image is consistent with the number of unit of microlens array 401；The surface imaging detector subregion split by unit microlens provides the spatial frequency field information of correspondence for the space pixel that final spectrum picture is corresponding, the array of subregion is K × K, spatial resolution requirements according to spectrum picture, K span is comparatively suitable between 5 to 20.
If Fig. 2 is the present invention single-point pixel field information recording principle schematic diagram based on the digital zoom type optical spectrum imagers of microlens array sensor, the light of the red object point 6 to be measured in A place of thing side is imaged in microlens array sensor 4 through electric control belt pass filter 2, optical imaging lens 3, surface imaging detector in microlens array sensor 4 while with microlens array resolution spectra re-recorded image information, records the spatial frequency field information of each spectrum picture pixel；nullIn like manner，The principle of digital zoom operation is as shown in Figure 3，The red object point 6 to be measured in A place of thing side、Green object point 7 to be measured、Blue object point 8 three place to be measured is imaged on three unit microlens places on microlens array sensor 4 respectively，Surface imaging detector in microlens array sensor 4 is recording red object point to be measured 6、Green object point 7 to be measured、While the spectral image information of blue object point 8 to be measured，Position according to unit microlens is simultaneously with its spatial frequency field information of K*K An arrayed recording，The spatial frequency field information that in this K*K array subregion, the corresponding object point to be measured of each pixel is different，By choosing particular space frequency light field as shown in Figure 3 for each determinand point numeral，Abandon other field information simultaneously，It is combined into the spectrum picture of new microlens array resolution，Can obtain B place of thing side object under test clearly as，This has substantial promise for the remote sensing survey definition of complicated topography and geomorphology，This zoom mode of exact figure more can obtain object under test spectral information more accurately simultaneously.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (3)
1. the digital zoom type optical spectrum imagers based on microlens array sensor, it is characterised in that including:
Electric control belt pass filter (2): the light of object under test (1), after the filtration of electric control belt pass filter (2), is sent to optical imaging lens (3)；
Optical imaging lens (3): for the target light source received being converted to optical imagery and being transported to microlens array sensor (4)；
Microlens array sensor (4): the light from object under test (1) sequentially passes through the focal plane of electric control belt pass filter (2), optical imaging lens (3) arrival microlens array sensor (4), microlens array sensor (4) gathers the spatial frequency field information that space pixel corresponding to final spectrum picture provides corresponding, and is transferred to image acquisition and processing terminal (5)；
Image acquisition and processing terminal (5): carry out imaging processing according to the spatial frequency field information collected, form image.
2. a kind of digital zoom type optical spectrum imagers based on microlens array sensor according to claim 1, it is characterized in that: microlens array sensor (4) includes microlens array (401) dough-making powder imaging detector (402), and optical imaging lens (3) forms conjugation with surface imaging detector (402) relative to microlens array (401).
3. a kind of digital zoom type optical spectrum imagers based on microlens array sensor according to claim 2, it is characterised in that: described microlens array (401) is the K*K lens matrix being arranged to make up by lenticule, the natural number of K ∈ [50,20].
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