CN102768072A - Thermal infrared imager and correcting device and method thereof - Google Patents
Thermal infrared imager and correcting device and method thereof Download PDFInfo
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- CN102768072A CN102768072A CN2012102857424A CN201210285742A CN102768072A CN 102768072 A CN102768072 A CN 102768072A CN 2012102857424 A CN2012102857424 A CN 2012102857424A CN 201210285742 A CN201210285742 A CN 201210285742A CN 102768072 A CN102768072 A CN 102768072A
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Abstract
An embodiment of the invention discloses a correcting device of a thermal infrared imager. The correcting device comprises a first driving device, a first black body blocking piece, a second driving device, a second black body blocking piece and a controller, wherein the first black body blocking piece is provided with a first temperature and connected to an output end of the first driving device; the second black body blocking piece is provided with a second temperature and connected to an output end of the second driving device; and the controller is connected to the first driving device and the second driving device, controls the first black body blocking piece to move between a first position and a second position, and controls the second black body blocking piece to move between a third position and a fourth position. According to the correcting device of the thermal infrared imager, the first black body blocking piece and the second black body blocking piece respectively move to the position between an infrared focal plane detector and an infrared lens to obtain a first infrared original image and a second infrared original image, so that correcting parameters of infrared images are obtained. Therefore, the correcting device can perform correcting parameter update on the thermal infrared imager in real time to adapt to different conditions and environment changes.
Description
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Technical field
The present invention relates to the infrared imaging field, particularly relate to a kind of means for correcting and method and thermal infrared imager thereof of thermal infrared imager.
Background technology
Thermal infrared imager is under the promotion of national defense applications and the application of other strategy and tactics, to grow up beginning of the eighties late 1970s, and it is the important photoelectric device that obtains scenery infrared emanation information.Except that being applied to traditional situation imaging, infrared focal plane detector also is widely used in fields such as industrial automatic control, medical diagnosis, chemical process detection, infrared astronomy.
The heterogeneity of infrared focal plane detector is to export the inconsistency that is had between each probe unit when having importing in same homogeneous radiation field, the external world that different output response characteristics causes owing to each probe unit of infrared focal plane array.Usually claim that this inconsistency noise is the heterogeneity noise, is embodied in spatial noise or fixed pattern noise on image.The spatial domain noise that this heterogeneity causes is far longer than the time domain noise usually, can not be inhibited through time domain average, is the main limiting factor of the whole imaging performance of thermal infrared imager.
To the thermal infrared imager Nonuniformity Correction is exactly in order to improve its performance, improves its image quality, simultaneously high cost performance and fast speeds should be arranged.So following several principles is answered in its correction: l) all pixels can both produce the output signal by light transfer characteristic after correction; 2) proofreading and correct should be all effective in the whole working range of sensor; 3) the signal output response after proofreading and correct will be as quickly as possible, and is preferably real-time; The parameter of 4) proofreading and correct should be lacked as far as possible, to reduce the complexity of mathematical model and hardware circuit.
Traditional thermal imaging system all can have the Nonuniformity Correction process, generally can before dispatching from the factory, demarcate, and the Nonuniformity Correction parameter is solidificated in thermal imaging system inside.But because long-time use or environment for use and demarcation environmental difference are too big, losing efficacy wholly or in part can appear in the Nonuniformity Correction parameter of often solidifying.At this moment, thermal imaging system goes back to factory with regard to needs and demarcates with black matrix again, and new data is solidified once more, therefore gives to use and brings many inconvenience.
Summary of the invention
One of the object of the invention provides a kind of apparatus and method of can be in real time the correction parameter of thermal infrared imager being upgraded.
One of the object of the invention provides a kind of means for correcting and method and thermal imaging system thereof with the thermal infrared imager of correction work, real-time renewal correction parameter of demarcating of robotization at the scene.
The disclosed technical scheme of the embodiment of the invention comprises:
A kind of means for correcting of thermal infrared imager is characterized in that, comprising: first drive unit; The first black matrix catch, the said first black matrix catch has first temperature, and is connected to the output terminal of said first drive unit; Second drive unit; The second black matrix catch, the said second black matrix catch has second temperature, and is connected to the output terminal of said second drive unit; Controller; Said controller is connected to said first drive unit and said second drive unit; And control said first drive unit and drive the said first black matrix catch and between the primary importance and the second place, move, and control said second drive unit and drive the said second black matrix catch and between the 3rd position and the 4th position, move; Wherein: in said primary importance, the said first black matrix catch is between the infrared focal plane detector and infrared lens of thermal infrared imager; In the said second place, the said first black matrix catch is outside between said infrared focal plane detector and the said infrared lens; In said the 3rd position, the said second black matrix catch is between said infrared focal plane detector and said infrared lens; In said the 4th position, the said second black matrix catch is outside between said infrared focal plane detector and the said infrared lens.
Further, the said first black matrix catch also comprises first temperature control equipment, and said first temperature control equipment is connected to the said first black matrix catch and controls said first temperature of the said first black matrix catch.
Further, the said second black matrix catch also comprises second temperature control equipment, and said second temperature control equipment is connected to the said second black matrix catch and controls said second temperature of the said second black matrix catch.
A kind of method of using above-mentioned correction infrared image also is provided in the embodiments of the invention, it is characterized in that, comprising: said controller is controlled said first drive unit and is driven the said first black matrix catch and move to said primary importance; Said thermal infrared imager carries out infrared imaging, obtains the first infrared original image; Said controller is controlled said first drive unit and is driven the said first black matrix catch and move to the said second place; Said controller is controlled said second drive unit and is driven the said second black matrix catch and move to said the 3rd position; Said thermal infrared imager carries out infrared imaging, obtains the second infrared original image; Said controller is controlled said second drive unit and is driven the said second black matrix catch and move to said the 4th position; Said controller calculates the correction parameter of said thermal infrared imager according to the said first infrared original image and the said second infrared original image.
Further, said controller comprises according to the correction parameter that the said first infrared original image and the said second infrared original image calculate said thermal infrared imager: calculate the average of the said first infrared original image, obtain first average; Calculate the average of the said second infrared original image, obtain second average; According to said first average and the said correction parameter of said second mean value computation.
Further, said correction parameter is the Nonuniformity Correction parameter.
A kind of thermal infrared imager also is provided in the embodiments of the invention, it is characterized in that, comprise any one above-mentioned means for correcting.
In the embodiments of the invention; In thermal infrared imager, be provided with the first black matrix catch and the second black matrix catch with different temperatures; When infrared thermal imaging system need upgrade correction parameter; The first black matrix catch and the second black matrix catch are moved between the infrared focal plane detector of thermal infrared imager and the infrared lens of thermal infrared imager (perhaps diaphragm); Can obtain the first infrared original image and the second infrared original image to the imaging of the first black matrix catch and the second black matrix catch, can obtain the correction parameter of infrared image according to this first infrared original image and the second infrared original image.Like this, can upgrade infrared image being carried out correction parameter in real time, thereby make thermal infrared imager can adapt to the variation of various conditions and environment, carry out real time imagery easily.
Description of drawings
Fig. 1 is the structural representation of means for correcting of the thermal infrared imager of one embodiment of the invention.
Fig. 2 is the schematic perspective view of means for correcting of the thermal infrared imager of one embodiment of the invention.
Fig. 3 is the schematic flow sheet of method of the correction infrared image of the thermal infrared imager in the use embodiments of the invention of one embodiment of the invention.
Fig. 4 is the schematic flow sheet of method of the correction infrared image of the thermal infrared imager in the use embodiments of the invention of another embodiment of the present invention.
Embodiment
As depicted in figs. 1 and 2, in one embodiment of the present of invention, comprise the means for correcting of thermal infrared imager in the thermal infrared imager, this means for correcting is arranged in the thermal infrared imager, is the part of thermal infrared imager.
In one embodiment of the present of invention, the means for correcting of this thermal infrared imager comprises first drive unit 3, the first black matrix catch 1, second drive unit 4, second black matrix catch 2 and the controller.The first black matrix catch 1 is connected to the output terminal of first drive unit 3, and first drive unit 3 can drive 1 motion of the first black matrix catch; The second black matrix catch 2 is connected to the output terminal of second drive unit 4, and second drive unit 4 can drive 2 motions of the second black matrix catch; The first black matrix catch 1 has first temperature, and the second black matrix catch 2 has second temperature.Here; " output terminal " of first drive unit 3 and second drive unit 4 is meant the port of first drive unit 3 and second drive unit, 4 outputting powers; For example, when first drive unit 3 and second drive unit 4 were motor, " output terminal " here referred to the output shaft of motor.
In the embodiments of the invention, first drive unit 3 and second drive unit 4 can be arranged in the thermal infrared imager, for example, are fixed in the suitable position on the thermal infrared imager.
The controller (not shown) also can be arranged in the thermal infrared imager, can be independent element, also can be to be integrated in the controller of thermal infrared imager, as the part of the controller of thermal infrared imager.
Controller is connected to first drive unit 3 and second drive unit 4.Controller can be controlled first drive unit 3 and drive 1 motion of the first black matrix catch, for example, between the primary importance and the second place, moves.Among the embodiment; Here " primary importance " is meant that the first black matrix catch 1 is positioned at the position between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6); For example, like the first black matrix catch, 1 residing position among Fig. 1; " second place " is meant the position of the first black matrix catch 1 outside being positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6), i.e. any position the position between infrared focal plane detector 5 and infrared lens 9 (perhaps diaphragm 6).
Similarly, controller can be controlled second drive unit 4 and drive 2 motions of the second black matrix catch, for example, between the 3rd position and the 4th position, moves.Among the embodiment, " the 3rd position " here is meant that the second black matrix catch 2 is positioned at the position between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6); " the 4th position " is meant the position of the second black matrix catch 2 outside being positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6); I.e. any position the position between infrared focal plane detector 5 and infrared lens 9 (perhaps diaphragm 6); For example, like the second black matrix catch, 2 residing positions among Fig. 1.
In the embodiments of the invention, first drive unit 3 drives the motion of the first black matrix catch 1 and/or the motion of second drive unit, 4 drivings, the second black matrix catch 2 can be to rotate, shown in the embodiment among Fig. 1 and Fig. 2; Also can be translation, for example, drive black matrix catch translation (not shown) between the two positions through linear electric motors or other mechanism's (for example, pinion and rack) that can realize translation.Here, realize that the mechanism of translation can be any suitable mechanism, repeat no more at this.
In the embodiments of the invention, first drive unit 3 and second drive unit 4 can be anyly can drive any drive unit that the first black matrix catch 1 and the second black matrix catch 2 move between two positions separately, for example, and motor, or the like.
In the embodiments of the invention, the first black matrix catch 1 and the second black matrix catch 2 can be black matrix catch commonly used in this area, like the metal material catch of high heat conductance.
In the embodiments of the invention, the value of second temperature of first temperature of the first black matrix catch 1 and the second black matrix catch 2 can be provided with according to the needs of actual conditions flexibly.For example, among the embodiment, first temperature can be 20 degrees centigrade, and second temperature can be 40 degrees centigrade.Certainly, one of ordinary skill in the art will readily recognize that in the embodiments of the invention that this first temperature is not limited to 20 degrees centigrade, second temperature is not limited to 40 degrees centigrade, but can be the demand according to reality, chooses any suitable temperature value.
In one embodiment of the present of invention; The first black matrix catch 1 also includes first temperature control equipment 7; First temperature control equipment 7 is connected to the first black matrix catch 1, and can control the temperature of the first black matrix catch 1, promptly controls this first temperature of the first black matrix catch 1.
In one embodiment of the present of invention; The second black matrix catch 2 also includes second temperature control equipment 8; Second temperature control equipment 8 is connected to the second black matrix catch 2, and can control the temperature of the second black matrix catch 2, promptly controls this second temperature of the second black matrix catch 2.
In the embodiments of the invention, first temperature control equipment 7 and second temperature control equipment 8 can be any devices that can control black matrix catch temperature (i.e. the temperature of the first black matrix catch 1 and the second black matrix catch 2).For example, among the embodiment, first temperature control equipment 7 and/or second temperature control equipment 8 are suitable temperature controller, such as Thermal Electric Cooler (TEC).
Specify the method for the correction infrared image that uses the thermal infrared imager in the embodiments of the invention below.
As shown in Figure 3, in one embodiment of the present of invention, use the method for the correction infrared image of the thermal infrared imager in the embodiments of the invention to comprise step 10, step 12, step 14, step 16 and step 18.
Step 10: the first black matrix catch 1 moves to primary importance.
When its correction parameter proofreaied and correct or upgraded to infrared thermal imaging system need; For example; The controller of the means for correcting of aforementioned thermal infrared imager receives when need proofreading and correct infrared image or needing to upgrade instruction or the signal of correction parameter of infrared image; At first, controller is controlled first drive unit 3 and is driven the first black matrix catch, 1 motion (for example, rotating perhaps translation) to primary importance.At this moment, the first black matrix catch 1 is positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6).
The temperature that makes the first black matrix catch 1 is T1 (promptly first temperature is T1).
Step 12: obtain the first infrared original image.
The first black matrix catch 1 is moved to after the primary importance, make thermal infrared imager carry out infrared imaging.At this moment; Because the first black matrix catch 1 is positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6); Therefore the image that thermal infrared imager became is to be the infrared image that the first black matrix catch 1 of first temperature is become to temperature, and the infrared image that this became is the first infrared original image.
For example, when the probe unit array of the infrared focal plane detector of thermal infrared imager is M * N, the first infrared original image will comprise M * N pixel, and (i j) has separately value U to each pixel
1(i, j), for example, this value of pixel can be represented with the response voltage of the corresponding probe unit of this pixel.Here, M, N represent the line number and the columns of the probe unit array of infrared focal plane detector respectively, are the natural number greater than 0; I, j represent the row at a pixel place and the row at place respectively; I and j are the integer more than or equal to 0,0≤i≤(M-1) wherein, and 0≤j≤(N-1).
The concrete steps that are carried out to picture with thermal infrared imager can be used step commonly used in this area, are not described in detail in this.
Step 14: the second black matrix catch 2 moves to the 3rd position.
Obtain after the first infrared original image; Controller is controlled first drive unit, 3 drivings, the first black matrix catch 1 and is moved to the second place, even the black matrix catch 1 of winning no longer is positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6).
Then; Controller is controlled second drive unit 4 and (is for example driven 2 motions of the second black matrix catch; Translation or rotation) to the 3rd position, promptly make the second black matrix catch 2 be positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6).
The temperature that makes the second black matrix catch 2 is T2 (promptly second temperature is T2).
Step 16: obtain the second infrared original image.
The second black matrix catch 2 is moved to after the 3rd position, make thermal infrared imager carry out infrared imaging.At this moment; Because the second black matrix catch 2 is positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of infrared focus plane thermal imaging system (perhaps diaphragm 6); Therefore the image that thermal infrared imager became is to be the infrared image that the second black matrix catch 2 of second temperature is become to temperature, and the infrared image that this became is the second infrared original image.
The first infrared original image is similar with obtaining in the step 12, and when the probe unit array of the infrared focal plane detector of thermal infrared imager is M * N, the second infrared original image will comprise M * N pixel, and (i j) has separately value U to each pixel
2(i, j), for example, this value of pixel can be represented with the response voltage of the corresponding probe unit of this pixel.Here, M, N represent the line number and the columns of the probe unit array of infrared focal plane detector respectively, are the natural number greater than 0; I, j represent the row at a pixel place and the row at place respectively; I and j are the integer more than or equal to 0,0≤i≤(M-1) wherein, and 0≤j≤(N-1).
The concrete steps that are carried out to picture with the infrared focus plane thermal imaging system can be used step commonly used in this area, are not described in detail in this.
Obtained after the second infrared original image; Controller is controlled second drive unit, 4 drivings, the second black matrix catch 2 and is moved to the 4th position; Even the second black matrix catch 2 no longer is positioned between the infrared focal plane detector 5 of thermal infrared imager and the infrared lens 9 of thermal infrared imager (perhaps diaphragm 6), avoid hindering the operate as normal of thermal infrared imager.
Step 18: according to the first infrared original image and the second infrared original image calculation correction parameter.
Obtained after the first infrared original image and the second infrared original image, controller calculates the correction parameter of infrared image according to this first infrared original image and this second infrared original image.
In one embodiment of the present of invention, the correction parameter that calculates infrared image according to the first infrared original image and the second infrared original image can comprise the steps.
(1) average of the calculating first infrared original image obtains first average.
For example, among the embodiment, can be according to computes first average:
，
Wherein,
It is first average; U
1(i, j) be pixel in the first infrared original image (i, value j), i, the j row that belongs to of remarked pixel point and row at place respectively wherein, i and j are the integer more than or equal to 0, and 0≤i≤(M-1) wherein, 0≤j≤(N-1); M, N represent the line number and the columns of the probe unit array of infrared focal plane detector respectively, are the natural number greater than 0.
(2) average of the calculating second infrared original image obtains second average.
For example, among the embodiment, can be according to computes first average:
Wherein,
It is second average; U
2(i, j) be pixel in the second infrared original image (i, value j), i, the j row that belongs to of remarked pixel point and row at place respectively wherein, i and j are the integer more than or equal to 0, and 0≤i≤(M-1) wherein, 0≤j≤(N-1); M, N represent the line number and the columns of the probe unit array of infrared focal plane detector respectively, are the natural number greater than 0.
(3) according to first average and the second mean value computation correction parameter.
For example, among the embodiment, can be according to computes first average:
Wherein (i j) is pixel (i, first correction parameter j) to G; (i j) is pixel (i, second correction parameter j) to O;
It is first average;
It is second average; U
1(i j) is (i, value j) of pixel in the first infrared original image; U
2(i, j) be pixel in the second infrared original image (i, value j), i, the j row that belongs to of remarked pixel point and row at place respectively wherein, i and j are the integer more than or equal to 0, and 0≤i≤(M-1) wherein, 0≤j≤(N-1); M, N represent the line number and the columns of the probe unit array of infrared focal plane detector respectively, are the natural number greater than 0.
In the embodiments of the invention, above-mentioned " correction parameter " can be the Nonuniformity Correction parameter, and this Nonuniformity Correction parameter is used for the Nonuniformity Correction of thermal infrared imager.
For example, as shown in Figure 4, in one embodiment of the present of invention, at first the correction parameter of initialization thermal infrared imager begins to form images normally with thermal infrared imager then.When needs upgrade Nonuniformity Correction parameter (for example, because the condition of detector changes), use the method among any embodiment among aforementioned each embodiment to calculate the Nonuniformity Correction parameter.For example:
Controller is controlled first drive unit, 3 drivings, the first black matrix catch 1 and is moved to primary importance;
Thermal infrared imager carries out infrared imaging, obtains the first infrared original image;
Controller is controlled first drive unit, 3 drivings, the first black matrix catch 1 and is moved to the second place;
Controller is controlled second drive unit, 4 drivings, the second black matrix catch 2 and is moved to the 3rd position;
Thermal infrared imager carries out infrared imaging, obtains the second infrared original image;
Controller is controlled second drive unit, 4 drivings, the second black matrix catch 2 and is moved to the 4th position;
Controller calculates the Nonuniformity Correction parameter of infrared image according to the first infrared original image and the second infrared original image.
Controller can comprise according to the Nonuniformity Correction parameter of the first infrared original image and the second infrared original image calculating infrared image:
Calculate the average of the first infrared original image, obtain first average;
Calculate the average of the second infrared original image, obtain second average;
According to first average and the second mean value computation Nonuniformity Correction parameter.
In the present embodiment, the concrete grammar that calculates the Nonuniformity Correction parameter can be identical with any embodiment among aforementioned each embodiment, repeats no more at this.
Then; The Nonuniformity Correction parameter that update calculation goes out; And thermal infrared imager is proofreaied and correct, and carry out normal infrared imaging (" gathering imageable target explorer response data ", " nonuniformity correction ", " other image pre-service " and steps such as " obtaining normal infrared image " as among Fig. 4 are said) with the Nonuniformity Correction parameter after upgrading.This normal infrared imaging step can be an infrared imaging step commonly used in this area, repeats no more at this.
In the process of normal infrared imaging, when needs upgrade Nonuniformity Correction parameter (for example, because the condition of detector changes), repeat aforesaid step, thereby upgrade the Nonuniformity Correction parameter of thermal infrared imager once more.
In the embodiments of the invention; In thermal infrared imager, be provided with the first black matrix catch and the second black matrix catch with different temperatures; When infrared thermal imaging system need upgrade correction parameter; The first black matrix catch and the second black matrix catch are moved between the infrared focal plane detector of thermal infrared imager and the infrared lens of thermal infrared imager (perhaps diaphragm); Can obtain the first infrared original image and the second infrared original image to the imaging of the first black matrix catch and the second black matrix catch, can obtain the correction parameter of infrared image according to this first infrared original image and the second infrared original image.Like this, can upgrade thermal infrared imager being carried out correction parameter in real time, thereby make thermal infrared imager can adapt to the variation of various conditions and environment, carry out real time imagery easily.
More than describe the present invention through concrete embodiment, but the present invention is not limited to these concrete embodiment.It will be understood by those skilled in the art that and to make various modifications to the present invention, be equal to replacement, change or the like that these conversion all should be within protection scope of the present invention as long as do not deviate from spirit of the present invention.In addition, above many places described " embodiment " representes various embodiment, can certainly be with its all or part of being combined among the embodiment.
Claims (7)
1. the means for correcting of a thermal infrared imager is characterized in that, comprising:
First drive unit;
The first black matrix catch, the said first black matrix catch has first temperature, and is connected to the output terminal of said first drive unit;
Second drive unit;
The second black matrix catch, the said second black matrix catch has second temperature, and is connected to the output terminal of said second drive unit;
Controller; Said controller is connected to said first drive unit and said second drive unit; And control said first drive unit and drive the said first black matrix catch and between the primary importance and the second place, move, and control said second drive unit and drive the said second black matrix catch and between the 3rd position and the 4th position, move;
Wherein:
In said primary importance, the said first black matrix catch is between the infrared focal plane detector and infrared lens of thermal infrared imager; In the said second place, the said first black matrix catch is outside between said infrared focal plane detector and the said infrared lens;
In said the 3rd position, the said second black matrix catch is between said infrared focal plane detector and said infrared lens; In said the 4th position, the said second black matrix catch is outside between said infrared focal plane detector and the said infrared lens.
2. device as claimed in claim 1 is characterized in that: the said first black matrix catch also comprises first temperature control equipment, and said first temperature control equipment is connected to the said first black matrix catch and controls said first temperature of the said first black matrix catch.
3. device as claimed in claim 1 is characterized in that: the said second black matrix catch also comprises second temperature control equipment, and said second temperature control equipment is connected to the said second black matrix catch and controls said second temperature of the said second black matrix catch.
4. the method for any described correction infrared image in use such as the claim 1 to 3 is characterized in that, comprising:
Said controller is controlled said first drive unit and is driven the said first black matrix catch and move to said primary importance;
Said thermal infrared imager carries out infrared imaging, obtains the first infrared original image;
Said controller is controlled said first drive unit and is driven the said first black matrix catch and move to the said second place;
Said controller is controlled said second drive unit and is driven the said second black matrix catch and move to said the 3rd position;
Said thermal infrared imager carries out infrared imaging, obtains the second infrared original image;
Said controller is controlled said second drive unit and is driven the said second black matrix catch and move to said the 4th position;
Said controller calculates the correction parameter of said infrared image according to the said first infrared original image and the said second infrared original image.
5. method as claimed in claim 4 is characterized in that: said controller comprises according to the correction parameter that the said first infrared original image and the said second infrared original image calculate said infrared image:
Calculate the average of the said first infrared original image, obtain first average;
Calculate the average of the said second infrared original image, obtain second average;
According to said first average and the said correction parameter of said second mean value computation.
6. method as claimed in claim 5 is characterized in that: said correction parameter is the Nonuniformity Correction parameter.
7. a thermal infrared imager is characterized in that, comprises like any described means for correcting in the claim 1 to 3.
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