CN115598746A - Single-lens long-wave infrared imager and image processing method thereof - Google Patents
Single-lens long-wave infrared imager and image processing method thereof Download PDFInfo
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- CN115598746A CN115598746A CN202211329169.2A CN202211329169A CN115598746A CN 115598746 A CN115598746 A CN 115598746A CN 202211329169 A CN202211329169 A CN 202211329169A CN 115598746 A CN115598746 A CN 115598746A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
Abstract
The application provides a single-lens long-wave infrared imager and an image processing method thereof, wherein the single-lens long-wave infrared imager comprises a single-lens imaging optical lens, and the single-lens imaging optical lens is a double-aspheric lens; the long-wave infrared detector is an area array detector, the pixel scale is 640 multiplied by 512, and the single-lens imaging optical lens is connected with the long-wave infrared detector; the long-wave infrared detector is provided with a processing circuit board, and the processing circuit board is provided with an information processing unit; the information processing unit is configured to restore a low-resolution original image shot by the single-lens long-wave infrared imager into a high-resolution image; based on the design idea of 'optics-image' integration, the single-chip double-aspheric lens is used as the optical lens, so that the volume of the whole infrared imaging system is reduced by more than 30%, the weight is reduced by more than 40%, the cost is reduced by more than 40%, and the total efficiency of the optical system under the wave band of 8-12 μm is improved.
Description
Technical Field
The application relates to the technical field of computational imaging, in particular to a single-lens long-wave infrared imager and an image processing method thereof.
Background
With the rapid development of photoelectric equipment such as military reconnaissance, unmanned driving, security monitoring and disaster relief, the demand for high-quality images is increasing day by day. At present, the imaging quality of the optical system is improved mainly by increasing the number of lenses or using a special surface type;
but the imaging quality of the system is improved, the overall volume, weight and cost of the system are increased, and the requirements on miniaturization, light weight and low cost are mutually contradictory;
in order to solve the problems of miniaturization, light weight and low cost of an imaging system, the application provides a single-lens long-wave infrared imager and an image processing method thereof.
Disclosure of Invention
The application aims to solve the problems and provides a single-lens long-wave infrared imager and an image processing method thereof.
In a first aspect:
the application provides a single lens long wave infrared imager, includes:
the single-lens imaging optical lens is a double-aspheric lens;
the long-wave infrared detector is an area array detector, the pixel scale is 640 multiplied by 512, and the single-lens imaging optical lens is connected with the long-wave infrared detector; the long-wave infrared detector is provided with a pretreatment circuit board, and the pretreatment circuit board is provided with an information processing unit;
the information processing unit is configured to restore the low-resolution image shot by the single-lens long-wave infrared imager to a high-resolution image.
According to the technical scheme provided by the embodiment of the application, the number of the double-aspheric-surface lenses is one.
According to the technical solution provided by the embodiment of the application, the biaspheric lens comprises an anterior surface and a posterior surface, the anterior surface is a first aspheric surface, and the coefficient of the first aspheric surface is a = -5.101660 × 10 -7 ，B＝1.837840×10 -11 ，C＝-3.707620×10 -13 ，D＝-4.637340×10 -17 The radius range is 109 mm-110 mm, and the light-transmitting aperture range is phi 70.5 mm-phi 71.5mm; the back surface is a second aspheric surface with coefficient of A = -5.155260 × 10 -7 ，B＝1.321300×10 -10 ，C＝-7.104970×10 -13 ，D＝1.814090×10 -16 The radius range is 212.5 mm-213.5 mm, and the clear aperture range is phi 70.5 mm-phi 71.5mm.
According to the technical scheme provided by the embodiment of the application, the central thickness range of the double-aspheric lens is 9.5 mm-10.5 mm.
According to the technical scheme provided by the embodiment of the application, the optical material of the double-aspheric lens is germanium.
In a second aspect:
the application also provides a single-lens long-wave infrared imager and an image processing method thereof, wherein the method comprises the following steps:
shooting a scene by using the single-lens long-wave infrared imager with the double-aspheric lens to obtain an original image, wherein the original image is a low-resolution image;
inputting the original image and the PSF of the double-aspheric lens into an information processing unit, wherein an ADMM algorithm is arranged in the information processing unit;
and restoring the original image by using the ADMM algorithm and the PSF.
Compared with the prior art, the beneficial effect of this application: the optical lens used in the application is a double-aspheric lens, the double-aspheric lens is connected with a long-wave infrared detector, a processing circuit board is arranged on the wave infrared detector, an information processing unit is also arranged on the processing circuit board, and the information processing unit is mainly used for recovering an original image shot by a single-lens long-wave infrared imager and improving the resolution ratio of the original image; in the using process, a single-lens long-wave infrared imager based on a double-aspheric lens is used for shooting a scene, the shot picture is input into an information processing unit for processing, and the processed picture is a high-resolution picture; based on the design idea of 'optics-image' integration, the method adopts a single-chip double-aspheric lens as an optical lens and combines the single-chip double-aspheric lens with an image processing algorithm to replace the method of designing the optical lens by combining a plurality of lenses and various optical materials in the prior art, so that the volume of the whole infrared imaging system is reduced by more than 30%, the weight is reduced by more than 40%, and the cost is reduced by more than 40%; the long-wave infrared imager is used for shooting a scene, the shot picture is input into the information processing unit for processing and recovery, the spatial resolution of the processed and recovered image can reach the cut-off frequency of the infrared detector, and the total efficiency of an optical system under the wave band of 8-12 mu m can reach more than 93%.
Drawings
FIG. 1 is a schematic diagram of a single-lens long-wave infrared imager according to an embodiment of the present application;
FIG. 2 is a graph of optical transfer function values for a single lens long wave infrared imager;
FIG. 3 is a flow chart of image processing for a single lens long wave infrared imager.
The text labels in the figures are represented as:
1. a single-lens imaging optical lens; 3. an information processing unit.
Detailed Description
The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.
Example one
The application provides a single-lens long-wave infrared imager, wherein the working waveband of the single-lens long-wave infrared imager is 8-12 mu m, the diagonal view field is 12 degrees, the parameter of the focal length is f =70mm, and the F number is 1.0;
referring to fig. 1-3, the present embodiment provides a single-lens long-wave infrared imager, including:
the imaging optical lens system comprises a single-lens imaging optical lens 1, wherein the single-lens imaging optical lens 1 is a double-aspheric lens;
the long-wave infrared detector is an area array detector, the pixel scale is 640 multiplied by 512, and the single-lens imaging optical lens 1 is connected with the long-wave infrared detector; the long-wave infrared detector is provided with a processing circuit board, and the processing circuit board is provided with an information processing unit 3;
the information processing unit 3 is configured to restore the low-resolution original image captured by the single-lens long-wave infrared imager to a high-resolution image.
Specifically, in the present embodiment, the single-lens imaging optical lens 1 uses a double-aspheric lens; the long-wave infrared detector is an area array detector, the pixel scale of the area array detector is 640 multiplied by 512, a lens barrel of the single-lens imaging optical lens 1 is provided with a connecting interface, and the connecting interface is butted with the single-lens long-wave infrared detector and fixed together in a screw mode; the long-wave infrared detector is further provided with a processing circuit board, the processing circuit board is provided with an information processing unit 3, and the information processing unit 3 is configured to restore a low-resolution image obtained by shooting an external scene by the single-lens long-wave infrared imager into a high-resolution image.
Furthermore, the number of the double-aspheric surface lens is one.
Specifically, in this embodiment, the number of the biaspheric lens is one, and the use of one biaspheric lens can reduce the weight, volume and cost of the system while ensuring the quality of the captured image.
Further, the biaspheric lens comprises an anterior surface and a posterior surface, the anterior surface being a first aspheric surface having a coefficient of A = -5.101660 × 10 -7 ，B＝1.837840×10 -11 ，C＝-3.707620×10 -13 ，D＝-4.637340×10 -17 The radius range is 109 mm-110 mm, and the light-transmitting aperture range is phi 70.5 mm-phi 71.5mm; the back surface is a second aspheric surface with coefficient of A = -5.155260 × 10 -7 ，B＝1.321300×10 -10 ，C＝-7.104970×10 -13 ，D＝1.814090×10 -16 The radius range is 212.5 mm-213.5 mm, and the light-passing aperture range is phi 70.5 mm-phi 71.5mm.
Specifically, in this embodiment, according to the direction of the optical path, the left side surface and the right side surface of all the optical elements in the drawing are defined as front surfaces and back surfaces, the front surfaces and the back surfaces are aspheric surfaces, but the parameters of the front surfaces and the back surfaces are different, the front surfaces are first aspheric surfaces, and the coefficient of the first aspheric surface is a = -5.101660 × 10 -7 ，B＝1.837840×10 -11 ，C＝-3.707620×10 -13 ，D＝-4.637340×10 -17 The radius range is 109 mm-110 mm, and the light-transmitting aperture range is phi 70.5 mm-phi 71.5mm; the coefficient of the second aspheric surface is A = -5.155260 multiplied by 10 -7 ，B＝1.321300×10 -10 ，C＝-7.104970×10 -13 ，D＝1.814090×10 -16 The radius range is 212.5 mm-213.5 mm, and the light-passing aperture range is phi 70.5 mm-phi 71.5mm.
Furthermore, the central thickness range of the double-aspheric lens is 9.5 mm-10.5 mm.
Specifically, in the present embodiment, this range is a constraint range of the optical lens center thickness design.
Further, the optical material of the double-aspheric lens is germanium.
Specifically, in this embodiment, the reason that germanium is selected as the material of the biaspheric lens is that the germanium material has the characteristics of high refractive index, good transmission performance and the like in the long-wave infrared band, and is a commonly used infrared material, and in this embodiment, the refractive index of the material is matched with the center thickness of the biaspheric lens and the surface shape of the biaspheric lens together, so as to realize the design of the single-lens optical lens 1.
Example two
The application provides a single-lens long-wave infrared imager and a processing method of an image thereof, wherein the method comprises the following steps:
1. shooting a scene by using the single-lens long-wave infrared imager with the double-aspheric lens to obtain an original image, wherein the original image is a low-resolution image;
specifically, a single-lens long-wave infrared imager provided with the double-aspheric lens is used for shooting an external scene to obtain an original image, wherein the original image is an image with low resolution, and the low resolution is a blurred image which is not clearly seen;
2. inputting the original image and the PSF of the double-aspheric lens into an information processing unit, wherein an ADMM algorithm is arranged in the information processing unit;
specifically, the original image obtained by shooting and the PSF of the double-aspheric lens are input into an information processing unit for processing; an ADMM algorithm is built in the information processing unit, the ADMM algorithm is the prior art, and the PSF is a point spread function, which is well known to those skilled in the art and is not described herein again.
3. Restoring the original image by using the ADMM algorithm and the PSF;
the ADMM algorithm is an alternating direction multiplier method, which is a conventional technique, and the original image is restored by using the ADMM algorithm and the PSF of the biaspheric lens, and a first image is formed after the restoration.
4. Using standard long-wave infrared imager with same optical parameters and designed by the prior art to shoot high resolution reference image of the same scenery;
shooting the same scenery by using an existing standard long-wave infrared imager, wherein the working waveband, the diagonal visual field and the F number of the existing standard long-wave infrared imager are consistent with the working conditions in the application, forming a second image after shooting, wherein the resolution of the second image is high resolution, the high resolution is a clear image, the first image is used as a reference image, and the scenery is consistent with the scenery shot by the imager provided with the double-aspheric lens;
5. inputting the first image and the second image into a discrimination program arranged in an information processing unit, carrying out similarity discrimination calculation based on an SSIM (structural similarity) evaluation method, and if the similarity is more than 95%, outputting the second image as an output image of the single-lens long-wave infrared imager;
if the discrimination similarity is less than 95%, random perturbation should be added to the ADMM algorithm and the PSF for correction, the correction method belongs to a correction method in the prior art, and is not repeated again, and step 3 and step 4 are re-executed until a restored image meeting the requirements, namely a high-resolution image, is output.
The principles and embodiments of the present application are described herein using specific examples, which are only used to help understand the method and its core idea of the present application. The foregoing are only preferred embodiments of the present application and it should be noted that there are no more than a few objective specific configurations due to the limited nature of the words that may be employed, and that modifications, decorations, or changes may be made by those skilled in the art without departing from the principles of the present invention or the technical features described above may be combined in any suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.
Claims (6)
1. A single-lens long-wave infrared imager, comprising:
the single-lens imaging optical lens (1), wherein the single-lens imaging optical lens (1) is a double-aspheric lens;
the long-wave infrared detector is an area array detector, the pixel scale is 640 multiplied by 512, and the single-lens imaging optical lens (1) is connected with the long-wave infrared detector; the long-wave infrared detector is provided with a pretreatment circuit board, and the pretreatment circuit board is provided with an information processing unit (3);
the information processing unit (3) is configured to restore the low-resolution image shot by the single-lens long-wave infrared imager to a high-resolution image.
2. The single-lens long-wave infrared imager of claim 1, wherein there is one bi-aspheric lens.
3. The single-lens long-wave infrared imager of claim 1, wherein the biaspheric lens comprises an anterior surface and a posterior surface, the anterior surface being a first aspheric surface having a coefficient of A = -5.101660 x 10 -7 ，B＝1.837840×10 -11 ，C＝-3.707620×10 -13 ，D＝-4.637340×10 -17 The radius range is 109 mm-110 mm, and the light-transmitting aperture range is phi 70.5 mm-phi 71.5mm; the back surface is a second aspheric surface with coefficient of A = -5.155260 × 10 -7 ，B＝1.321300×10 -10 ，C＝-7.104970×10 -13 ，D＝1.814090×10 -16 The radius range is 212.5 mm-213.5 mm, and the light-passing aperture range is phi 70.5 mm-phi 71.5mm.
4. The single-lens long wave infrared imager of claim 3, wherein the central thickness of the biaspheric lens is in the range of 9.5mm to 10.5mm.
5. The single-lens long-wave infrared imager of claim 4, wherein the optical material of the biaspheric lens is germanium.
6. A single-lens long-wave infrared imager and an image processing method thereof are characterized by comprising the following steps:
shooting a scene by using the single-lens long-wave infrared imager with the double-aspheric lens to obtain an original image, wherein the original image is a low-resolution image;
inputting the original image and the PSF of the double-aspheric lens into an information processing unit, wherein an ADMM algorithm is arranged in the information processing unit;
and restoring the original image by using the ADMM algorithm and the PSF.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211329169.2A CN115598746A (en) | 2022-10-27 | 2022-10-27 | Single-lens long-wave infrared imager and image processing method thereof |
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| CN202211329169.2A CN115598746A (en) | 2022-10-27 | 2022-10-27 | Single-lens long-wave infrared imager and image processing method thereof |
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