CN103528690A - Nonuniform correction method for thermal infrared imager - Google Patents
Nonuniform correction method for thermal infrared imager Download PDFInfo
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- CN103528690A CN103528690A CN201310436158.9A CN201310436158A CN103528690A CN 103528690 A CN103528690 A CN 103528690A CN 201310436158 A CN201310436158 A CN 201310436158A CN 103528690 A CN103528690 A CN 103528690A
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Abstract
The embodiment of the invention discloses a nonuniform correction method for a thermal infrared imager. The nonuniform correction method for the thermal infrared imager comprises the following steps: measuring the gray value of the infrared image of a black body and the gray value of the infrared image of a catch at at least two temperatures to obtain the function relationship between a black body image gray value and a catch image gray value; when the catch is used for carrying out nonuniform correction on the thermal infrared imager, converting the infrared image of the catch into a conversion image which satisfies the function relationship; and carrying out nonuniform correction by the conversion image. Therefore, the nonuniform correction comprises the nonuniform correction caused to a lens, and nonuniformity introduced in by the lens can be reduced or compensated together so as to improve the imaging quality of the thermal infrared imager.
Description
Technical field
The present invention relates to thermal infrared imager technical field, especially relate to a kind of nonuniformity correction method of thermal infrared imager.
Background technology
Research for non-refrigerated infrared focal plane probe is set up under the needs such as national defense applications.At the aspect such as industrial, medical, military, have a wide range of applications and development prospect at present.A lot of to the research of the thermal imaging system based on non-refrigerated infrared focal plane probe in recent years, and gradual perfection and maturation.
Heterogeneity is the important indicator of weighing detector performance and affecting imaging effect.For improving image quality, need to proofread and correct heterogeneity.General asymmetric correction method is to be directed to separately detector.When being applied to thermal imaging system, may introduce the heteropical factor of other influences.
Existing thermal imaging system has a catch between camera lens and detector, by catch, can carry out a bit and two point calibrations.But this structure exists a kind of defect, introduced the heterogeneity of camera lens.When utilizing catch to carry out a bit or during two point calibrations, infrared radiation does not pass through camera lens; When thermal imager operation, infrared radiation has passed through camera lens.And camera lens is have itself heteropical.Therefore existing this correcting mode can not be eliminated the heterogeneity of camera lens.
Summary of the invention
One of object of the present invention is to provide a kind of nonuniformity correction method that can reduce or eliminate heteropical thermal infrared imager of camera lens.
Technical scheme disclosed by the invention comprises:
A kind of nonuniformity correction method that thermal infrared imager is provided, is characterized in that, comprising: the black matrix that is the first temperature to temperature carries out infrared imaging, obtains the first gray-scale value; The catch that to temperature is the described thermal infrared imager of described the first temperature carries out infrared imaging, obtains the second gray-scale value; The described black matrix that is the second temperature to temperature carries out infrared imaging, obtains the 3rd gray-scale value; The described catch that is described the second temperature to temperature carries out infrared imaging, obtains the 4th gray-scale value; According to described the first gray-scale value, the second gray-scale value, the 3rd gray-scale value and the 4th gray-scale value, determine the funtcional relationship between black matrix gradation of image value and catch gradation of image value; Described catch is carried out to infrared imaging, obtain the infrared image of described catch; According to described funtcional relationship and described infrared image, determine changing image, wherein said changing image and described infrared image meet described funtcional relationship; With described changing image, described thermal infrared imager is carried out to nonuniformity correction.
In one embodiment of the invention, described catch is between the lens assembly of described thermal infrared imager and the infrared focal plane array seeker of described thermal infrared imager.
In one embodiment of the invention, described funtcional relationship is: GLENS * R+OLENS=RB, and wherein R is described catch gradation of image value, and RB is described black matrix gradation of image value, and GLENS is first lens nonlinear parameter, and OLENS is the second lens nonlinear parameter.
In one embodiment of the invention, described changing image is RB(i, j)=GLENS * R(i, j)+OLENS, wherein RB(i, j) be described changing image, R(i, j) be described infrared image, GLENS is described first lens nonlinear parameter, and OLENS is described the second lens nonlinear parameter, and i and j are more than or equal to 0 integer, and 0≤i≤(M-1) wherein, 0≤j≤(N-1); M, N are respectively line number and the columns of the probe unit array of infrared focal plane detector.
In one embodiment of the invention, the step that the described changing image of described use carries out nonuniformity correction to described thermal infrared imager comprises: with described changing image, described thermal infrared imager is carried out to point calibration/two point calibration.
In method in embodiments of the invention, infrared image by being determined at black matrix at least two temperature (, when the catch of thermal infrared imager does not block between camera lens and infrared focal plane array seeker) gray-scale value and catch (, when the catch of thermal infrared imager blocks between camera lens and infrared focal plane array seeker) the gray-scale value of infrared image, obtaining black matrix gradation of image value (is that catch does not block infrared focal plane array seeker, to the radiation of infrared focal plane array seeker during through camera lens) and catch gradation of image value (catch blocks infrared focal plane array seeker, while not passing through camera lens to the radiation of infrared focal plane array seeker) between funtcional relationship, when using catch to carry out nonuniformity correction to thermal infrared imager, convert the infrared image of catch (this image is formed by the infrared radiation that does not pass through camera lens) to meet this funtcional relationship changing image, and carry out nonuniformity correction with this changing image.Like this, in this nonuniformity correction, comprise heteropical correction that camera lens is caused, can reduce in the lump or compensate the heterogeneity of being introduced by camera lens, thereby improved the image quality of thermal infrared imager.
Accompanying drawing explanation
Fig. 1 is the catch gray scale under the different temperatures of demonstration actual measurement acquisition and the figure of black matrix gray scale.
Fig. 2 for schematically showing the schematic diagram of the data in Fig. 1 in coordinate system.
Fig. 3 is the schematic flow sheet of nonuniformity correction method of the thermal infrared imager of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, describe nonuniformity correction side's ratio juris and the concrete steps of the thermal infrared imager of embodiments of the invention in detail.
Thermal infrared imager generally includes infrared focal plane array seeker (hereafter " detector ") and camera lens, between camera lens and detector, is typically provided with catch.This catch is movably, can blocking position, (now catch be positioned in the light path from camera lens to detector, be that blocks infrared radiation arrives detector from camera lens) and (now catch is not positioned at the light path from camera lens to detector to allow open position, allow infrared radiation to arrive detector from camera lens) between motion (for example, moving by the mode of rotation).This catch for example, for the nonuniformity correction of thermal infrared imager, a point calibration and/or two point calibrations etc.Catch is provided with temperature sensor with the temperature of monitoring catch.
But, because catch is between camera lens and detector, therefore with catch, carrying out and/or some timings at 2, infrared emanation is without thermal imaging system camera lens.And thermal infrared imager in the course of the work, extraneous radiation will be passed through camera lens, thereby can introduce the heterogeneity of camera lens.Therefore, directly use catch to carry out and/or some timings at 2, cannot eliminate the heterogeneity of camera lens.
But, applicant finds through research, for a definite thermal infrared imager, when catch does not block detector (, catch is positioned at and allows open position, the radiation of now arriving detector is through camera lens) for the response of the pixel on standard black bulk detector (, the gray-scale value of the infrared image now obtaining, be referred to as black matrix gradation of image value herein) and when catch blocks infrared focal plane array seeker (, catch is positioned at and blocks position, now to the radiation of detector, do not pass through camera lens) response of pixel on detector is (, the gray-scale value of the infrared image now obtaining, be referred to as catch gradation of image value herein) between meet specific funtcional relationship.
For example, as shown in Figure 1, applicant has gathered under a series of different temperatures detector when the response gray-scale value (be called catch gray scale) of catch when blocking position with when catch data for the corresponding gray-scale value (being called black matrix gray scale) of standard black matrix when allowing open position.
These data are illustrated in coordinate as shown in Figure 2, visible, for definite thermal infrared imager, black matrix gradation of image value and catch gradation of image value are along with the variation of temperature meets linear relation, and black matrix gradation of image value and catch gradation of image value are along with temperature linearity changes.
Therefore, in embodiments of the invention, can first determine the funtcional relationship between black matrix gradation of image value and catch gradation of image value, then when carrying out nonuniformity correction, by this funtcional relationship, to being used for carrying out the infrared image of the catch of nonuniformity correction, convert, and carry out nonuniformity correction with the changing image after conversion, rather than directly with the infrared image of catch, carry out nonuniformity correction.
Therefore, according to one embodiment of present invention, a kind of schematic flow sheet of nonuniformity correction method of thermal infrared imager as shown in Figure 1, describes its each step below in detail.
Step 10: the first gray-scale value that obtains the black matrix of the first temperature.
In this step, the black matrix that is the first temperature to temperature carries out infrared imaging, obtains the first gray-scale value.
For example, in this step, the catch of thermal infrared imager is positioned at allow open position, and the temperature that makes black matrix is the first temperature, with thermal infrared imager, black matrix is carried out to infrared imaging, obtain the detector of thermal infrared imager to the response of the infrared radiation of black matrix (obtaining infrared image), obtain thus the first gray-scale value.
In embodiments of the invention, first gray-scale value is here the gray-scale value of each pixel of the infrared image that obtains of this step.
In embodiments of the invention, also can become multiple image to the black matrix of the first temperature, the first gray-scale value is pixel in this multiple image or the average in region.
Step 12: the second gray-scale value that obtains the catch of the first temperature.
In step 12, to temperature, be that the catch of the thermal infrared imager of aforementioned the first temperature carries out infrared imaging, obtain the second gray-scale value.That is to say, the catch of thermal infrared imager is positioned at and blocks position, and the temperature that makes catch for and the first temperature identical in step 10, then obtain the detector of thermal infrared imager now for the response (obtaining infrared image) of the infrared radiation of catch, thus, obtain the second gray-scale value.
In embodiments of the invention, second gray-scale value here can be also the infrared image that obtains of this step the gray-scale value of specific pixel, the gray-scale value of a plurality of specific pixel points and, average or other statistical values, specifically the pixel in region gray-scale value and, the gray-scale value of all pixels of average or other statistical values or this infrared image and, average or other statistical values, etc.
In embodiments of the invention, also can become multiple image to the catch of the first temperature, the second gray-scale value is pixel in this multiple image or the average in region.
In step 14, similar with step 10, catch is positioned at allow open position, the temperature of black matrix is adjusted to the second temperature, and the black matrix that is the second temperature to temperature carries out infrared imaging, obtain the 3rd gray-scale value.
In step 16, similar with step 12, catch is positioned at and blocks position, and to make the temperature of catch be second temperature identical with step 14, catch is carried out to infrared imaging, obtain the 4th gray-scale value.
Step 18: determine the funtcional relationship between black matrix gradation of image value and catch gradation of image value.
After having obtained the first gray-scale value, the second gray-scale value, the 3rd gray-scale value and the 4th gray-scale value, in step 18, can determine the funtcional relationship between black matrix gradation of image value and catch gradation of image value according to this first gray-scale value, the second gray-scale value, the 3rd gray-scale value and the 4th gray-scale value.
As mentioned before, between black matrix gradation of image value and catch gradation of image value along with temperature variation meets linear relationship.And in step 12-16, obtained one group of data (the first gray-scale value and the second gray-scale value) and one group of data at the second temperature (the 3rd gray-scale value and the 4th gray-scale value) at the first temperature.If the funtcional relationship between black matrix gradation of image value and catch gradation of image value is G
lENS* R+O
lENS=RB, R is catch gradation of image value here, RB is black matrix gradation of image value, G
lENSfor first lens nonlinear parameter, O
lENSbe the second lens nonlinear parameter, and G in this funtcional relationship
lENSand O
lENSbe unknown, R and RB are variablees.By in aforesaid two groups of these functional expressions of data substitution, wherein the first gray-scale value and the 3rd gray-scale value be respectively as RB, and the second gray-scale value and the 4th gray-scale value be respectively as R, can obtain that to comprise two unknown quantitys (be G
lENSand O
lENS) system of equations, solve this system of equations, can obtain G
lENSand O
lENSvalue.Determined G
lENSand O
lENSvalue, also determined the funtcional relationship between black matrix gradation of image value and catch gradation of image value.For definite thermal infrared imager, this funtcional relationship is changeless.
In embodiments of the invention, aforesaid step 10, step 12, step 14, step 16 and step 18 can be carried out in advance before thermal infrared imager normal operation, and for example, by the black matrix gradation of image value obtaining and funtcional relationship (, the aforesaid G between catch gradation of image value
lENSand O
lENSvalue) be stored in thermal infrared imager.When infrared thermal imager operation and while carrying out nonuniformity correction, can directly from thermal infrared imager, read and call this funtcional relationship.
Step 20: the infrared image that obtains catch.
In embodiments of the invention, after having obtained the funtcional relationship between black matrix gradation of image value and catch gradation of image value, can carry out and with catch, thermal infrared imager be carried out the step of nonuniformity correction (for example, a point calibration and/or two point calibrations).
In this step, catch can be placed in and block position, then this catch be carried out to infrared imaging (that is, the response of the detector of acquisition thermal infrared imager to the infrared radiation of catch), obtain the infrared image of catch.
Step 22: determine changing image according to funtcional relationship and infrared image.
In embodiments of the invention, after having obtained the infrared image of catch, according to aforesaid funtcional relationship and this infrared image, determine changing image, wherein this changing image and this infrared image meet aforesaid funtcional relationship.That is to say, determine and infrared image between meet the image (this image is referred to as changing image herein) of aforementioned functions relation.
For example, changing image can be: RB(i, j)=G
lENS* R(i, j)+O
lENS, wherein RB(i, j) and be required changing image, R(i, j) be the infrared image of catch, G
lENSfor aforesaid first lens nonlinear parameter, O
lENSfor aforesaid the second lens nonlinear parameter, i and j are the integer that is more than or equal to 0, and 0≤i≤(M-1) wherein, 0≤j≤(N-1); M, N represent respectively line number and the columns of the probe unit array of infrared focal plane detector, are the natural number that is greater than 0.
In fact, the changing image is here equivalent to catch and is positioned at the image while allowing open position, the image that infrared radiation of process camera lens becomes.In the method for the embodiment of the present invention, be actually infrared image with the funtcional relationship that obtains above and catch estimate infrared image with this catch corresponding, be positioned at the image while allowing open position (that is, to the infrared radiation of detector will through camera lens) when catch.Therefore, in the changing image here, the heterogeneity of being introduced by camera lens will be comprised.
Step 24: carry out nonuniformity correction with changing image.
After the changing image obtaining, in step 24, available this changing image carries out nonuniformity correction to thermal infrared imager, for example a point calibration and/or two point calibrations.Concrete bearing calibration or step can be well known in the art, do not repeat them here.
In method in embodiments of the invention, infrared image by being determined at black matrix at least two temperature (, when the catch of thermal infrared imager does not block between camera lens and infrared focal plane array seeker) gray-scale value and catch (, when the catch of thermal infrared imager blocks between camera lens and infrared focal plane array seeker) the gray-scale value of infrared image, obtaining black matrix gradation of image value (is that catch does not block infrared focal plane array seeker, to the radiation of infrared focal plane array seeker during through camera lens) and catch gradation of image value (catch blocks infrared focal plane array seeker, while not passing through camera lens to the radiation of infrared focal plane array seeker) between funtcional relationship, when using catch to carry out nonuniformity correction to thermal infrared imager, convert the infrared image of catch (this image is formed by the infrared radiation that does not pass through camera lens) to meet this funtcional relationship changing image, and carry out nonuniformity correction with this changing image.Like this, in this nonuniformity correction, comprise heteropical correction that camera lens is caused, can reduce in the lump or compensate the heterogeneity of being introduced by camera lens, thereby improved the image quality of thermal infrared imager.
By specific embodiment, describe the present invention above, but the present invention is not limited to these specific embodiments.It will be understood by those skilled in the art that and can also make various modifications to the present invention, be equal to replacement, change etc., 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, " embodiment " described in above many places represents different embodiment, can certainly be by its all or part of combination in one embodiment.
Claims (5)
1. a nonuniformity correction method for thermal infrared imager, is characterized in that, comprising:
The black matrix that is the first temperature to temperature carries out infrared imaging, obtains the first gray-scale value;
The catch that to temperature is the described thermal infrared imager of described the first temperature carries out infrared imaging, obtains the second gray-scale value;
The described black matrix that is the second temperature to temperature carries out infrared imaging, obtains the 3rd gray-scale value;
The described catch that is described the second temperature to temperature carries out infrared imaging, obtains the 4th gray-scale value;
According to described the first gray-scale value, the second gray-scale value, the 3rd gray-scale value and the 4th gray-scale value, determine the funtcional relationship between black matrix gradation of image value and catch gradation of image value;
Described catch is carried out to infrared imaging, obtain the infrared image of described catch;
According to described funtcional relationship and described infrared image, determine changing image, wherein said changing image and described infrared image meet described funtcional relationship;
With described changing image, described thermal infrared imager is carried out to nonuniformity correction.
2. the method for claim 1, is characterized in that: described catch is between the lens assembly of described thermal infrared imager and the infrared focal plane array seeker of described thermal infrared imager.
3. the method for claim 1, is characterized in that, described funtcional relationship is: G
lENS* R+O
lENS=RB, wherein R is described catch gradation of image value, RB is described black matrix gradation of image value, G
lENSfor first lens nonlinear parameter, O
lENSit is the second lens nonlinear parameter.
4. method as claimed in claim 3, is characterized in that: described changing image is RB(i, j)=G
lENS* R(i, j)+O
lENS, wherein RB(i, j) and be described changing image, R(i, j) be described infrared image, G
lENSfor described first lens nonlinear parameter, O
lENSfor described the second lens nonlinear parameter, i and j are more than or equal to 0 integer, and 0≤i≤(M-1) wherein, 0≤j≤(N-1); M, N are respectively line number and the columns of the probe unit array of infrared focal plane detector.
5. method as claimed in claim 3, is characterized in that, the step that the described changing image of described use carries out nonuniformity correction to described thermal infrared imager comprises: with described changing image, described thermal infrared imager is carried out to a point calibration or two point calibrations.
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| CN114526820A (en) * | 2020-11-02 | 2022-05-24 | 丁后君 | Heat sensor |
| CN112763072A (en) * | 2020-12-31 | 2021-05-07 | 深圳市景阳信息技术有限公司 | Thermal imaging correction method and device and terminal equipment |
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| TWI804913B (en) * | 2021-07-06 | 2023-06-11 | 熱映光電股份有限公司 | Temperature correcting method of a temperature measuring device |
| CN113489907A (en) * | 2021-07-16 | 2021-10-08 | 北京富吉瑞光电科技股份有限公司 | Imaging control method and device of thermal infrared imager and infrared imaging equipment |
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