# US 12,181,343 B2 · Method and system for building short-wave, medium-wave and long-wave infrared spectrum dictionary

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- Number: US 12,181,343 B2
- Document ID: US12181343B2
- Status: Granted
- Kind: B2
- Application number: 18/298,250
- Filed: 2023-04-10
- Published: 2024-02-08
- Granted: 2024-12-31
- Earliest claimed: 2022-08-05
- Assignees: Huazhong University of Science and Technology
- Applicants: Huazhong University of Science and Technology
- Inventors: Tianxu Zhang; Wandong He; Lei Gao; Bin Zhou; Xin Zhou
- Web page: https://patentgrep.com/patent/US12181343B2

## CPC

- G01J 3/51: using colour filters
- G01J 5/10: using electric radiation detectors
- G01J 3/524: {Calibration of colorimeters}
- G01J 2005/0077: {Imaging}
- G01N 21/27: using photo-electric detection (G01N21/31 takes precedence){; circuits for computing concentration (logarithmic circuits G06G7/24; photometric circuits in general G01J)}
- G01N 21/63: optically excited
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A method and a system for building a short-wave, medium-wave and long-wave infrared spectrum dictionary are provided. The method includes: building an infrared three-primary-color chromaticity diagram by using infrared spectrum response curves of an infrared three-primary-color sensor group; performing weighted combination on the infrared spectrum response curves; performing multi-scale discretization on the infrared three-primary-color chromaticity diagram, clustering chromaticity coordinates generated by discretization into different groups, performing weighted combination on the infrared spectrum response curves corresponding to the chromaticity coordinates of each point in the groups, generating a new image-space infrared spectrum, and adding the new image-space infrared spectrum to an initial image-space infrared spectrum dictionary; performing weighted combination on object-space Planck curves associated with three different temperatures to build an object-space Planck spectrum dictionary; and using the final image-space infrared spectrum dictionary and the object-space Planck spectrum dictionary to build the short-wave, medium-wave and long-wave infrared spectrum dictionary.

## Claims

### Claim 1

A method for building a short-wave, medium-wave and long-wave infrared spectrum dictionary for preparation of a computational imaging spectrometer, the method comprising the following steps:
S1: measuring to obtain infrared spectrum response curves of an infrared three-primary-color sensor group under a condition of variable input signals, wherein the infrared three-primary-color sensor group comprises: a short-wave infrared sensor, a medium-wave infrared sensor and a long-wave infrared sensor;
S2: performing normalization on the infrared spectrum response curves of the infrared three-primary-color sensor group, using same as spectrum-based functions, and taking the proportions of the sum of tristimulus values accounted for by the tristimulus values corresponding to an infrared imaging sensor group as chromaticity of an infrared band to form an infrared three-primary-color chromaticity diagram;
S3: performing weighted combination on the infrared spectrum response curves to build an initial image-space infrared spectrum dictionary;
S4: performing multi-scale discretization on the infrared three-primary-color chromaticity diagram, clustering chromaticity coordinates generated by discretization into different groups, performing weighted combination on the infrared spectrum response curves corresponding to the chromaticity coordinates of each point in the groups, generating a new image-space infrared spectrum, adding the new image-space infrared spectrum to the initial image-space infrared spectrum dictionary, and generating a final image-space infrared spectrum dictionary;
S5: performing weighted combination on object-space Planck curves associated with three different temperatures to build an object-space Planck spectrum dictionary, wherein the object-space Planck curves associated with three different temperatures are respectively a high-temperature object-space Planck curve, a medium-temperature object-space Planck curve and a low-temperature object-space Planck curve according to the temperatures;
S6: using the final image-space infrared spectrum dictionary and the object-space Planck spectrum dictionary to build a short-wave, medium-wave and long-wave infrared spectrum dictionary; and
preparing the computational imaging spectrometer with the short-wave, medium-wave, and long-wave infrared spectrum dictionary.

### Claim 2 (depends on 1)

The building method according to claim 1, further comprising the following steps between S5 and S6:
selecting a preset real target and a preset background, and acquiring an image-space infrared spectrum of the real target and the background by using the infrared three-primary-color sensor group; and
adding the image-space infrared spectrum of the real target and the background to the final image-space infrared spectrum dictionary.

### Claim 3 (depends on 1)

The building method according to claim 1, wherein S4 specifically comprises the following steps:
taking points on the infrared three-primary-color chromaticity diagram with different spectral resolutions, and performing discretization on the infrared three-primary-color chromaticity diagram to build a multi-scale spectrum curve of the infrared three-primary-color sensor group, wherein the scales indicate changes in the spectral resolutions;
clustering chromaticity coordinates generated by discretization according to different spectral resolutions into different groups;
for a single point on the infrared three-primary-color chromaticity diagram, performing weighted superposition according to three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared to calculate an image-space infrared spectrum curve corresponding to the single point on the infrared three-primary-color chromaticity diagram;
for a set of aggregated adjacent points on the infrared three-primary-color chromaticity diagram, respectively adding three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of the points, performing division by the number of coordinate points, and using same as weighting coefficients to perform weighted addition on infrared spectrum response curves corresponding to each wave band to build a new image-space infrared spectrum curve;
for a line segment on the infrared three-primary-color chromaticity diagram, respectively adding three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points on the line segment, performing division by the number of points on the line segment, respectively taking calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and building a new image-space infrared spectrum curve;
for a curve on the infrared three-primary-color chromaticity diagram, adding three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points according to position relations of the points on the curve, performing division by the number of points on line segments, respectively taking calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and building a new image-space infrared spectrum curve; and
adding all of the new image-space infrared spectrum curves to the initial image-space infrared spectrum dictionary to generate a final image-space infrared spectrum dictionary.

### Claim 4 (depends on 1)

The building method according to claim 1, wherein elements of the object-space Planck spectrum dictionary are expressed as follows:
Planck_curve
H
=
α
h
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
⁢
Planck_curve
M
=
α
m
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
⁢
Planck_curve
L
=
α
l
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
wherein Planck_CurveH represents a high-temperature Planck curve element; Planck_CurveM represents a medium-temperature Planck curve element; Planck_CurveL represents a low-temperature Planck curve element; α represents area coefficients multiplied by the object-space Planck curves associated with three temperatures, so that the high-temperature object-space Planck spectrum curve, the medium-temperature object-space Planck spectrum curve and the low-temperature object-space Planck spectrum curve have the same order of magnitude; c1 represents a first radiation constant; c2 represents a second radiation constant; and λ is the wavelength of the object-space Planck spectrum, and T is an absolute temperature in units of K.

### Claim 5 (depends on 3)

The building method according to claim 3, wherein coordinates of the infrared three-primary-color chromaticity diagram are:
swir=SWIR/(SWIR+MWIR+LWIR);
mwir=MWIR/(SWIR+MWIR+LWIR); and
lwir=LWIR/(SWIR+MWIR+LWIR),
wherein swir+mwir+lwir=1, and SWIR, MWIR, and LWIR are respectively stimulus values corresponding to short-wave infrared, medium-wave infrared and long-wave infrared.

### Claim 6

A system for building a short-wave, medium-wave and long-wave infrared spectrum dictionary for preparation of a computational imaging spectrometer, the system comprising:
an infrared three-primary-color sensor group, configured to measure to obtain infrared spectrum response curves under a condition of variable input signals, wherein the infrared three-primary-color sensor group comprises: a short-wave infrared sensor, a medium-wave infrared sensor and a long-wave infrared sensor;
an infrared three-primary-color chromaticity diagram building module, configured to perform normalization on the infrared spectrum response curves of the infrared three-primary-color sensor group, use same as spectrum-based functions, and take the proportions of the sum of tristimulus values accounted for by the tristimulus values corresponding to an infrared imaging sensor group as chromaticity of an infrared band to form an infrared three-primary-color chromaticity diagram;
an initial image-space infrared dictionary building module, configured to perform weighted combination on the infrared spectrum response curves to build an initial image-space infrared spectrum dictionary;
a final image-space infrared dictionary building module, configured to perform multi-scale discretization on the infrared three-primary-color chromaticity diagram, cluster chromaticity coordinates generated by discretization into different groups, perform weighted combination on infrared spectrum response curves corresponding to the chromaticity coordinates of each point in the groups, generate a new image-space infrared spectrum, add the new image-space infrared spectrum to the initial image-space infrared spectrum dictionary, and generate a final image-space infrared spectrum dictionary;
an object-space Planck spectrum dictionary building module, configured to perform weighted combination on object-space Planck curves associated with three different temperatures to build an object-space Planck spectrum dictionary, wherein the object-space Planck curves associated with three different temperatures are respectively a high-temperature object-space Planck curve, a medium-temperature object-space Planck curve and a low-temperature object-space Planck curve according to the temperatures; and
a short-wave, medium-wave and long-wave infrared spectrum dictionary building module, configured to build a short-wave, medium-wave and long-wave infrared spectrum dictionary by using the final image-space infrared spectrum dictionary and the object-space Planck spectrum dictionary,
wherein the computational imaging spectrometer is prepared with the short-wave, medium-wave and long-wave infrared spectrum dictionary.

### Claim 7 (depends on 6)

The building system according to claim 6, wherein the infrared three-primary-color sensor group is further configured to select a preset real target and a preset background and acquire an image-space infrared spectrum of the real target and the background; and
a spectrum processing module is configured to add the image-space infrared spectrum of the real target and the background to the final image-space infrared spectrum dictionary.

### Claim 8 (depends on 6)

The building system according to claim 6, wherein the final image-space infrared dictionary building module comprises:
a chromaticity diagram discretization unit, configured to take points on the infrared three-primary-color chromaticity diagram with different spectral resolutions, and perform discretization on the infrared three-primary-color chromaticity diagram to build a multi-scale spectrum curve of the infrared three-primary-color sensor group, wherein the scales indicate changes in the spectral resolutions;
a coordinate clustering unit, configured to cluster chromaticity coordinates generated by discretization according to different spectral resolutions into different groups;
a unit for building a single-point image-space infrared spectrum curve, configured to perform weighted superposition according to three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared for a single point on the infrared three-primary-color chromaticity diagram, and calculate an image-space infrared spectrum curve corresponding to the single point on the infrared three-primary-color chromaticity diagram;
a unit for building a point-set image-space infrared spectrum curve, configured to respectively add three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points in a set of aggregated adjacent points on the infrared three-primary-color chromaticity diagram, perform division by the number of coordinate points, use same as weighting coefficients to perform weighted addition on infrared spectrum response curves corresponding to each wave band to build a new image-space infrared spectrum curve;
a unit for building a line-segment image-space infrared spectrum curve, configured to: for a line segment on the infrared three-primary-color chromaticity diagram, respectively add three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points on the line segment, perform division by the number of points on the line segment, respectively take calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and build a new image-square infrared spectrum curve;
a unit for building a curve image-space infrared spectrum curve, configured to: for a curve on the infrared three-primary-color chromaticity diagram, respectively add three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points according to position relations of the points on the curve, perform division by the number of points on line segments, respectively take calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and build a new image-space infrared spectrum curve; and
a unit for building a final image-space infrared spectrum dictionary, configured to add all of the new image-space infrared spectrum curves to the initial image-space infrared spectrum dictionary to generate a final image-space infrared spectrum dictionary.

### Claim 9 (depends on 6)

The building system according to claim 6, wherein elements of the object-space Planck spectrum dictionary are expressed as follows:
Planck_curve
H
=
α
h
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
⁢
Planck_curve
M
=
α
m
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
⁢
Planck_curve
L
=
α
l
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
wherein Planck_curveH represents a high-temperature Planck curve element; Planck_curveM represents a medium-temperature Planck curve element; Planck_curveL represents a low-temperature Planck curve element; αh, αm and αL respectively represent area coefficients multiplied by the high-temperature object-space Planck spectrum curve, the medium-temperature object-space Planck spectrum curve and the low-temperature object-space Planck spectrum curve; c1 represents a first radiation constant; c2 represents a second radiation constant; and λ is the wavelength of the object-space Planck spectrum, and T is an absolute temperature in units of K.

### Claim 10 (depends on 8)

The building system according to claim 8, wherein coordinates of the infrared three-primary-color chromaticity diagram are:
swir=SWIR/(SWIR+MWIR+LWIR);
mwir=MWIR/(SWIR+MWIR+LWIR); and
lwir=LWIR/(SWIR+MWIR+LWIR),
wherein swir+mwir+lwir=1, and SWIR, MWIR, and LWIR are respectively stimulus values corresponding to short-wave infrared, medium-wave infrared and long-wave infrared.

### Claim 11

A method for building a short-wave, medium-wave and long-wave infrared spectrum dictionary, the method comprising:
obtaining infrared spectrum response curves of an infrared three-primary-color sensor group under a condition of variable input signals, wherein the infrared three-primary-color sensor group comprises: a short-wave infrared sensor, a medium-wave infrared sensor, and a long-wave infrared sensor;
performing normalization on the infrared spectrum response curves of an infrared three-primary-color sensor group, using same as spectrum-based functions, and taking the proportions of the sum of tristimulus values accounted for by the tristimulus values corresponding to an infrared imaging sensor group as chromaticity of an infrared band to form an infrared three-primary-color chromaticity diagram;
performing weighted combination on the infrared spectrum response curves to build an initial image-space infrared spectrum dictionary;
performing multi-scale discretization on the infrared three-primary-color chromaticity diagram, clustering chromaticity coordinates generated by discretization into different groups, performing weighted combination on the infrared spectrum response curves corresponding to the chromaticity coordinates of each point in the groups, generating a new image-space infrared spectrum, adding the new image-space infrared spectrum to the initial image-space infrared spectrum dictionary, and generating a final image-space infrared spectrum dictionary;
performing weighted combination on object-space Planck curves associated with three different temperatures to build an object-space Planck spectrum dictionary, wherein the object-space Planck curves associated with three different temperatures are respectively a high-temperature object-space Planck curve, a medium-temperature object-space Planck curve and a low-temperature object-space Planck curve according to the temperatures; and
building a short-wave, medium-wave and long-wave infrared spectrum dictionary using the final image-space infrared spectrum dictionary and the object-space Planck spectrum dictionary.

### Claim 12 (depends on 11)

The building method according to claim 11, further comprising the following steps between the performing of the weighted combination on the object-space Planck curves and the building of the short-wave, medium-wave and long-wave infrared spectrum dictionary:
selecting a preset real target and a preset background, and acquiring an image-space infrared spectrum of the real target and the background by using the infrared three-primary-color sensor group; and
adding the image-space infrared spectrum of the real target and the background to the final image-space infrared spectrum dictionary.

### Claim 13 (depends on 11)

The building method according to claim 11, wherein the performing of the multi-scale discretization, the clustering of the chromaticity coordinates, the performing of the weighted combination, the generating of the new image-space infrared spectrum, the adding of the new image-space infrared spectrum, and the generating of the final image-space infrared spectrum dictionary comprise the following steps:
taking points on the infrared three-primary-color chromaticity diagram with different spectral resolutions, and performing discretization on the infrared three-primary-color chromaticity diagram to build a multi-scale spectrum curve of the infrared three-primary-color sensor group, wherein the scales indicate changes in the spectral resolutions;
clustering chromaticity coordinates generated by discretization according to different spectral resolutions into different groups;
for a single point on the infrared three-primary-color chromaticity diagram, performing weighted superposition according to three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared to calculate an image-space infrared spectrum curve corresponding to the single point on the infrared three-primary-color chromaticity diagram;
for a set of aggregated adjacent points on the infrared three-primary-color chromaticity diagram, respectively adding three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of the points, performing division by the number of coordinate points, and using same as weighting coefficients to perform weighted addition on infrared spectrum response curves corresponding to each wave band to build a new image-space infrared spectrum curve;
for a line segment on the infrared three-primary-color chromaticity diagram, respectively adding three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points on the line segment, performing division by the number of points on the line segment, respectively taking calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and building a new image-space infrared spectrum curve;
for a curve on the infrared three-primary-color chromaticity diagram, adding three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points according to position relations of the points on the curve, performing division by the number of points on line segments, respectively taking calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and building a new image-space infrared spectrum curve; and
adding all of the new image-space infrared spectrum curves to the initial image-space infrared spectrum dictionary to generate a final image-space infrared spectrum dictionary.

### Claim 14 (depends on 11)

The building method according to claim 11, wherein elements of the object-space Planck spectrum dictionary are expressed as follows:
Planck_curve
H
=
α
h
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
Planck_curve
M
=
α
m
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
Planck_curve
L
=
α
l
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
wherein Planck_CurveH represents a high-temperature Planck curve element; Planck_CurveM represents a medium-temperature Planck curve element; Planck_CurveL represents a low-temperature Planck curve element; α represents area coefficients multiplied by the object-space Planck curves associated with three temperatures, so that the high-temperature object-space Planck spectrum curve, the medium-temperature object-space Planck spectrum curve and the low-temperature object-space Planck spectrum curve have the same order of magnitude; c1 represents a first radiation constant; c2 represents a second radiation constant; and λ is the wavelength of the object-space Planck spectrum, and T is an absolute temperature in units of K.

### Claim 15 (depends on 13)

The building method according to claim 13, wherein coordinates of the infrared three-primary-color chromaticity diagram are:
swir=SWIR/(SWIR+MWIR+LWIR);
mwir=MWIR/(SWIR+MWIR+LWIR); and
lwir=LWIR/(SWIR+MWIR+LWIR),
wherein swir+mwir+lwir=1, and SWIR, MWIR, and LWIR are respectively stimulus values corresponding to short-wave infrared, medium-wave infrared and long-wave infrared.

### Claim 16

A system for building a short-wave, medium-wave and long-wave infrared spectrum dictionary, comprising:
an infrared three-primary-color sensor group, configured to measure to obtain infrared spectrum response curves under a condition of variable input signals, wherein the infrared three-primary-color sensor group comprises: a short-wave infrared sensor, a medium-wave infrared sensor and a long-wave infrared sensor;
an infrared three-primary-color chromaticity diagram building module, configured to perform normalization on the infrared spectrum response curves of the infrared three-primary-color sensor group, use same as spectrum-based functions, and take the proportions of the sum of tristimulus values accounted for by the tristimulus values corresponding to an infrared imaging sensor group as chromaticity of an infrared band to form an infrared three-primary-color chromaticity diagram;
an initial image-space infrared dictionary building module, configured to perform weighted combination on the infrared spectrum response curves to build an initial image-space infrared spectrum dictionary;
a final image-space infrared dictionary building module, configured to perform multi-scale discretization on the infrared three-primary-color chromaticity diagram, cluster chromaticity coordinates generated by discretization into different groups, perform weighted combination on infrared spectrum response curves corresponding to the chromaticity coordinates of each point in the groups, generate a new image-space infrared spectrum, add the new image-space infrared spectrum to the initial image-space infrared spectrum dictionary, and generate a final image-space infrared spectrum dictionary;
an object-space Planck spectrum dictionary building module, configured to perform weighted combination on object-space Planck curves associated with three different temperatures to build an object-space Planck spectrum dictionary, wherein the object-space Planck curves associated with three different temperatures are respectively a high-temperature object-space Planck curve, a medium-temperature object-space Planck curve and a low-temperature object-space Planck curve according to the temperatures; and
a short-wave, medium-wave and long-wave infrared spectrum dictionary building module, configured to build a short-wave, medium-wave and a long-wave infrared spectrum dictionary by using the final image-space infrared spectrum dictionary and the object-space Planck spectrum dictionary.

### Claim 17 (depends on 16)

The building system according to claim 16, wherein the infrared three-primary-color sensor group is further configured to select a preset real target and a preset background and acquire an image-space infrared spectrum of the real target and the background; and
a spectrum processing module is configured to add the image-space infrared spectrum of the real target and the background to the final image-space infrared spectrum dictionary.

### Claim 18 (depends on 16)

The building system according to claim 16, wherein the final image-space infrared dictionary building module comprises:
a chromaticity diagram discretization unit, configured to take points on the infrared three-primary-color chromaticity diagram with different spectral resolutions, and perform discretization on the infrared three-primary-color chromaticity diagram to build a multi-scale spectrum curve of the infrared three-primary-color sensor group, wherein the scales indicate changes in the spectral resolutions;
a coordinate clustering unit, configured to cluster chromaticity coordinates generated by discretization according to different spectral resolutions into different groups;
a unit for building a single-point image-space infrared spectrum curve, configured to perform weighted superposition according to three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared for a single point on the infrared three-primary-color chromaticity diagram, and calculate an image-space infrared spectrum curve corresponding to the single point on the infrared three-primary-color chromaticity diagram;
a unit for building a point-set image-space infrared spectrum curve, configured to respectively add three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points in a set of aggregated adjacent points on the infrared three-primary-color chromaticity diagram, perform division by the number of coordinate points, use same as weighting coefficients to perform weighted addition on infrared spectrum response curves corresponding to each wave band to build a new image-space infrared spectrum curve;
a unit for building a line-segment image-space infrared spectrum curve, configured to: for a line segment on the infrared three-primary-color chromaticity diagram, respectively add three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points on the line segment, perform division by the number of points on the line segment, respectively take calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and build a new image-square infrared spectrum curve;
a unit for building a curve image-space infrared spectrum curve, configured to: for a curve on the infrared three-primary-color chromaticity diagram, respectively add three coordinate values of medium-wave infrared, long-wave infrared and short-wave infrared corresponding to each of points according to position relations of the points on the curve, perform division by the number of points on line segments, respectively take calculation results of the three coordinate values as weighting coefficients of infrared spectrum response curves of the corresponding wave band for superposition calculation, and build a new image-space infrared spectrum curve; and
a unit for building a final image-space infrared spectrum dictionary, configured to add all of the new image-space infrared spectrum curves to the initial image-space infrared spectrum dictionary to generate a final image-space infrared spectrum dictionary.

### Claim 19 (depends on 16)

The building system according to claim 16, wherein elements of the object-space Planck spectrum dictionary are expressed as follows:
Planck_curve
H
=
α
h
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
Planck_curve
M
=
α
m
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
Planck_curve
L
=
α
l
·
c
1
λ
5
·
1
e
c
2
/
λ
⁢
T
-
1
wherein Planck_curveH represents a high-temperature Planck curve element; Planck_curveM represents a medium-temperature Planck curve element; Planck_curveL represents a low-temperature Planck curve element; αh, αm and αL respectively represent area coefficients multiplied by the high-temperature object-space Planck spectrum curve, the medium-temperature object-space Planck spectrum curve and the low-temperature object-space Planck spectrum curve; c1 represents a first radiation constant; c2 represents a second radiation constant; and λ is the wavelength of the object-space Planck spectrum, and T is an absolute temperature in units of K.

### Claim 20 (depends on 18)

The building system according to claim 18, wherein coordinates of the infrared three-primary-color chromaticity diagram are:
swir=SWIR/(SWIR+MWIR+LWIR);
mwir=MWIR/(SWIR+MWIR+LWIR); and
lwir=LWIR/(SWIR+MWIR+LWIR),
wherein swir+mwir+lwir=1, and SWIR, MWIR, and LWIR are respectively stimulus values corresponding to short-wave infrared, medium-wave infrared and long-wave infrared.