CN100443870C - Inhibition method of satellite borne infrared scanning imaging system dark background and its device - Google Patents
Inhibition method of satellite borne infrared scanning imaging system dark background and its device Download PDFInfo
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- CN100443870C CN100443870C CNB2005100260230A CN200510026023A CN100443870C CN 100443870 C CN100443870 C CN 100443870C CN B2005100260230 A CNB2005100260230 A CN B2005100260230A CN 200510026023 A CN200510026023 A CN 200510026023A CN 100443870 C CN100443870 C CN 100443870C
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Abstract
The present invention relates to a method for inhibiting the dark background of a satellite-borne infrared line series scanning imaging system and the device thereof, which has the following steps of the method. S1: a camera firstly scans the cold space outside the earth, collects microthermal backgrounds and together stores the backgrounds and inherent background signals of the system in a memory. S2: the background collection is closed and the stored dark background signals are restored to analog signals which are sent to a subtracter of the next level. S3: the camera scans the earth, sends the response to scenery of a detector after front playing to the subtractor of the next level to be subtracted by the analog signals pixel by pixel for eliminating the inherent dark background of the system. A preamplifier in the device selectively switches on and switches off the connection of a dark background collection storage unit and a dark background restoration unit to form a dark background collection a restoration access through an access switch. The response to the scenery of the line series detector is directly sent the subtracter of the next level as the access switch is closed after passing through the preamplifier, and are subtracted by the analog signals pixel by pixel to eliminate the inherent dark background of the system. The present invention inhibits the inherent dark background of the system, and improves the dynamic range and the temperature resolution of the image.
Description
Technical field:
The present invention relates to a kind of inhibition method and device of satellite borne infrared row imaging system dark background, specifically, be a kind of in infrared long detector array imaging system scanning imagery process, the dark background signal of infrared gear is excessive, the dynamic range of restriction front end simulating signal input and the solution and the device that cause the infrared image temperature resolution to descend.
Background technology
The core devices of modern infrared imaging system is focal plane arrays (FPA) (focal plane array FPA), comprises detector and signal read circuit.Because the influence of infrared detector material, manufacturing process, the inner sensing circuit of detector etc., for example, with wave detector in the long alignment in MCT2048 * 1 of Shanghai Inst. of Technical Physics, Chinese Academy of Sciences development is that the spaceborne infrared imaging instrument of core just exists an intrinsic dark background signal that influences dynamic range, need carry out pre-service to front end signal at the signal front end.Usually, the dark background signal of infrared imaging system is excessive, is enough to flood picture signal, under the condition of unglazed photograph, forms fixed pattern noise, and faint picture signal is submerged under the strong dark background of unevenness.In addition, the excessive dynamic range of dwindling system of dark signal has limited the enlargement factor of rear end amplifying circuit to signal.Here, said intrinsic dark background signal comprises the dark background signal that detector dark current and system's cavity heat radiation are produced.
Because the existence of intrinsic dark background signal, the signal that makes the part pixel be input to A/D can not be full of the full scale of AD, and other a part of pixel signal is saturated, is reflected in so just to become large-area white piece on the image, has lost the details of image; Enlargement factor is too small, and then the figure kine bias is dark, and tonal range is very narrow, and mainly concentrates on the low gray level, like this, makes and smudgy, the distortion of the picture signal of obtaining reduces spatial resolution and temperature resolution.
Summary of the invention:
As mentioned above, how to eliminate the intrinsic dark background in the infrared gear, improve the dynamic range of front end input signal, to improve the temperature resolution of system, be technical matters to be solved by this invention, therefore, the object of the present invention is to provide a kind of dark background inhibition method and device, the AFE (analog front end) signal of infrared eye being exported by dark background restraining device in the peripheral circuit carries out pre-service, the dynamic range of input signal can further be expanded, and do not make the picture signal distortion.
Technical scheme of the present invention is: a kind of method of eliminating spaceborne infrared gear dark background is provided, adopts the modulus hybrid circuit to realize, to expand dynamic range of signals, improve system temperature resolution.Comprise the following step:
S1, scanning camera be scanning earth external cooling space earlier, and gather low temperature background and deposit the intrinsic background signal of low temperature background signal and this satellite borne infrared scanning imaging system in storer together,
S2, afterwards, the scanning camera scanning earth is closed the data acquisition input channel, and the dark background signal that is stored in storer is reverted to simulating signal deliver to post-subtracter, and
S3, the scanning camera scanning earth, after before putting, directly send post-subtracter detector array to the response of scenery, carry out subtracting each other by pixel line by line with the dark scape simulating signal of sending among the step S2, finish elimination the intrinsic dark background signal of this satellite borne infrared scanning imaging system.
Restraining device according to a kind of satellite borne infrared scanning imaging system dark background of the present invention, system with circuit mode connect satellite borne infrared scanning imaging system before put a Digital Analog Hybrid Circuits that is connected the D/A converter array of this satellite borne infrared scanning imaging system with post-amplifier through this satellite borne infrared scanning imaging system, wherein: preceding put with background collection/inhibition switch optionally switch connect dark background collection/storage unit and dark background recovery unit and form the dark background collection and recover path, the post-subtracter that output dark background simulating signal is fed back to the analog amplify circuit end of described satellite borne infrared scanning imaging system subtracts; Before put by background collection/inhibition switch and select closed and forms dark background elimination path, detector array directly send described post-subtracter after scenery response process is before put, carry out subtracting each other by pixel line by line with the dark background simulating signal, differential signal amplifies the multi-channel d/a converter array that send described satellite borne infrared scanning imaging system through described post-amplifier.
Described dark background collection with recover path and comprise amplifier, A/D converter array so that dark background collection/recovery/the inhibition circuit is connected, parallel-to-serial converter, FPGA, SRAM, deserializer, multi-channel d/a converter array and the analog output channel that is connected post-subtracter wherein also have the external control unit of FPGA being operated control.
Advantage of the present invention is: owing to set up the dark background collection and recovered access structure, and cooperate dark background to eliminate access structure, the intrinsic dark background signal that has suppressed described satellite borne infrared scanning imaging system effectively, obviously improve the dynamic range of detector array to the scenery response, make full use of the quantizing bit number of A/D, improved the resolution of image temperature.
Description of drawings:
Fig. 1 is an embodiments of the invention scanning area synoptic diagram.
Fig. 2 is the principle of device synoptic diagram of the intrinsic dark background signal of inhibition system of the present invention.
Fig. 3 is that dark background of the present invention suppresses circuit block diagram.
Fig. 4 A and Fig. 4 B are ground of the present invention imaging experiment comparison diagrams.
Embodiment:
Give better embodiment of the present invention according to Fig. 1～Fig. 3 below.
By Fig. 1, scanning area is 3 ° of things, 20 ° in north and south, and satellite every run-down from south to north just has twice and scans the earth external space, and can carry out the collection of low temperature dark background signal this moment.Can upgrade background data when scanning extraterrestrial cold space at every turn.
Embodiment is:
S1, dark background collection: when scanning camera scans extraterrestrial cold space, the response of detector array is through behind the prime amplifier 41, deliver to multi-channel a/d converter array 42 and convert digital signal to, for improving signal to noise ratio (S/N ratio), gather 16 line data, signal to noise ratio (S/N ratio) can improve 4 times like this, and after the FPGA44 progressive mean, the capable SRAM45 that send is temporary as dark background;
S2, dark background recover: when scanning camera scanning terrestrial time, close the data acquisition input channel, carry out sequential control by FPGA44, the datacycle of respective modules, corresponding pixel is read, send deserializer 51 and 52 conversions of DAC array, simulating signal after the conversion is 53 outputs through the analog output channel, up to post-subtracter 6;
S3, dark background are eliminated: at scanning camera scanning terrestrial time, the response of 1 pair of scenery of detector array is directly sent post-subtracter 6 through behind the prime amplifier 2, subtract each other line by line with dark background is capable, finishing dark background eliminates, afterwards, through the A/D converter array of amplification, filtering chain of evacuation, can make the dynamic range of signal obtain expanding like this, maximally utilise the quantification bit number of A/D, improve temperature resolution.
In the image-forming demonstration system of ground, concrete implementation step is as follows:
S1, dark background collection comprise:
S1.1, determine 20 seconds system scan cycles, pixel output clock frequency 1MHZ according to working method, constant in whole scanning imagery process;
S1.2, usefulness low temperature blackboard hide the camera optics camera lens, and simulation earth external space low temperature background is as basal signal;
The signal of S1.3, external control component 30 is set to " gathering effectively ", opens the AD passage, gathers and goes signal this moment as the capable signal of dark background;
Behind S1.4, collection 16 line data, carry out progressive mean to improve signal to noise ratio (S/N ratio), to reduce the random noise influence;
S2, dark background recover to comprise:
S2.1, removal low temperature blackboard;
The signal of S2.2, external control component 30 is set to " output effectively ", opens the DA passage, the digital signal of exporting is converted to simulating signal sends;
S3, the dark back of the body are eliminated and are comprised step:
S3.1, recovery normal scan working method are carried out imaging to scenery, and scenery signal and dark background signal are subtracted each other through subtracter 6, eliminate the influence of dark background;
S3.2, the signal of doing behind the subtraction further amplify, and improve dynamic range of signals, and the AD that can import the back level gathers array and carries out the picture signal collection.
By the present invention, utilize the MCT2048 * 1 medium wave detector image-forming system of Shanghai Technical Physics Inst., Chinese Academy of Sciences's development to carry out imaging experiment, experimental result shows (seeing Fig. 4 A and Fig. 4 B), the dynamic range of front end simulating signal has obtained very big expansion, improve the temperature resolution of image, reached the purpose of the solid dark back of the body signal of inhibition system.
Embodiment 3
Provide a better embodiment of the restraining device of satellite borne infrared scanning imaging system dark background according to Fig. 2 and Fig. 3, as shown in Figure 2, present embodiment is one and connects prime amplifier and through the Digital Analog Hybrid Circuits of post-amplifier 7 connected system ADC arrays, wherein: prime amplifier 2 connects dark background collection/storage unit 4 and the 5 formation dark background collections of dark scape recovery unit and recovers path with channel selector 3 selective switchs, and provides the dark background simulating signal to post-subtracter 6; And on the other hand, prime amplifier 2 cuts off dark background via channel selector 3 and gathers path and the optionally closed dark background elimination path that forms, detector array 1 directly will be gathered the object simulation signal via prime amplifier 2 and send post-subtracter 6, with carry out from the background row simulating signal of dark background recovery unit 5 line by line subtracting each other by pixel, eliminated the intrinsic dark background signal of system.
As shown in Figure 3, the dark background collection comprises the amplifier 41 that becomes circuit to be connected successively with the recovery path, multi-channel a/d converter array 42, parallel-to-serial converter 43, FPGA44, SRAM45, deserializer 51, multi-channel d/a converter array 52 and the analog output channel 53 that is connected post-subtracter 6, wherein, also has the control module 30 of FPGA44 being operated control.In fact the background collection is used for implementing dark background collection and recovery with recovering path, promptly realizes the step S in the inventive method
1With step S
2
Claims (3)
1, a kind of inhibition method of satellite borne infrared scanning imaging system dark background, its step comprises:
S
1, the first scanning earth external cooling space acquisition low temperature background and deposit the intrinsic background signal of low temperature background signal and this satellite borne infrared scanning imaging system in storer together of scanning camera,
S
2, afterwards, the scanning camera scanning earth is closed dark background and is gathered input channel, the dark background signal that is stored in storer is reverted to simulating signal delivers to post-subtracter, and
S
3, the scanning camera scanning earth, after before putting, directly send post-subtracter to the response of scenery with detector array, carry out subtracting each other by pixel line by line with the dark background simulating signal of sending among the step S2, finish elimination this satellite borne infrared scanning imaging system dark background signal.
2, a kind of restraining device of satellite borne infrared scanning imaging system dark background, system with circuit mode connect satellite borne infrared scanning imaging system before put a Digital Analog Hybrid Circuits that is connected the multi-channel d/a converter array of this satellite borne infrared scanning imaging system with post-amplifier through this satellite borne infrared scanning imaging system, it is characterized in that, before put via background collection/inhibition switch optionally switch connect dark background and gather storage unit and dark background recovery unit and form the dark background collection and recover path, the post-subtracter that output dark background simulating signal is fed back to the analog amplify circuit end of described satellite borne infrared scanning imaging system subtracts; Before put via background collection/inhibition switch and select closed and form dark background to eliminate path, detector array directly send described post-subtracter to the response of scenery after before putting, carry out subtracting each other by pixel line by line with the dark background simulating signal.
3, the restraining device of satellite borne infrared scanning imaging system dark background according to claim 2, it is characterized in that, described dark background collection with recover path comprise with dark background collection/recovery/inhibition circuit be connected before put, multi-channel a/d converter array, parallel-to-serial converter, FPGA, SRAM, deserializer, multi-channel d/a converter array be connected described satellite borne infrared scanning imaging system in the analog output channel of post-subtracter, wherein, also has the external control unit of FPGA being operated control.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101582978B (en) * | 2009-06-18 | 2011-02-09 | 东南大学 | Background suppression method for infrared reading circuit and circuit thereof |
| DE102011084200A1 (en) * | 2011-10-10 | 2013-04-11 | Leica Geosystems Ag | Aerial camera with at least one lens |
| CN107796518B (en) * | 2017-09-22 | 2019-08-09 | 上海卫星工程研究所 | Linear array scanning camera is to complicated earth background imaging test method |
| CN108132217B (en) * | 2017-12-07 | 2020-09-29 | 毕研盟 | On-orbit signal-to-noise ratio evaluation method for hyperspectral remote sensing instrument |
| CN112284535A (en) * | 2020-09-15 | 2021-01-29 | 中国科学院上海技术物理研究所 | Dark background removing method for progressive on-orbit push-scan type medium-short wave infrared imaging spectrometer |
| CN112284539A (en) * | 2020-09-25 | 2021-01-29 | 中国科学院上海技术物理研究所 | Blind pixel compensation method for on-orbit short wave infrared imaging spectrometer |
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| CN1570957A (en) * | 2004-05-13 | 2005-01-26 | 上海交通大学 | Method for detecting infrared weak and small object under antiaerial imaging fluctuation background |
| CN1606033A (en) * | 2004-11-18 | 2005-04-13 | 上海交通大学 | Weak target detecting and tracking method in infrared image sequence |
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Patent Citations (4)
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| US5960097A (en) * | 1997-01-21 | 1999-09-28 | Raytheon Company | Background adaptive target detection and tracking with multiple observation and processing stages |
| CN2646794Y (en) * | 2003-06-24 | 2004-10-06 | 中国科学院光电技术研究所 | Equipment for implementing infrared image background compensation by using digital image processing module |
| CN1570957A (en) * | 2004-05-13 | 2005-01-26 | 上海交通大学 | Method for detecting infrared weak and small object under antiaerial imaging fluctuation background |
| CN1606033A (en) * | 2004-11-18 | 2005-04-13 | 上海交通大学 | Weak target detecting and tracking method in infrared image sequence |
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