Wavelength-selective infrared sensor-based thermal image colorization system and thermal image colorization method using same

Abstract

In this wavelength-selective infrared sensor-based thermal image colorization system and this thermal image colorization method using same, the thermal image colorization system comprises a measurement unit and a calculation unit. The measurement unit includes an infrared sensor unit that selectively senses infrared rays in different wavelength regions for infrared rays incident from a target object. The calculation unit includes a color conversion processing unit that, with respect to the sensing result of the infrared sensor unit, matches colors to each thermal image with respect to the infrared rays in different wavelength regions, so as to image the infrared rays in the different wavelength regions.

Description

A thermal image colorization system based on a wavelength-selective infrared sensor and a thermal image colorization method using the same

[0001] The present invention relates to a wavelength-selective infrared sensor-based thermal image colorization system and a thermal image colorization method using the same, and more particularly, to a wavelength-selective infrared sensor-based thermal image colorization system capable of implementing infrared colorization in response to infrared camouflage by maximizing visibility using a wavelength-selective infrared sensor having two or more degrees of freedom, and a thermal image colorization method using the same.

[0002] Typically, thermal imaging cameras that capture infrared light measure temperature with a single type of sensor and visualize it, allowing users to determine the temperature of an object or recognize an object through temperature differences.

[0003] For these infrared cameras, they simply measure the size of the heat with a single sensor regardless of the wavelength in the infrared region, and there is no great significance in using different filters or sensors for different wavelengths.

[0004] Meanwhile, in the case of infrared sensors, as in U.S. Patent No. 10764515 or U.S. Patent No. 9848118, etc., they are mainly used to remove or block infrared or near-infrared light in the measurement of visible light, and this also only applies a technology to filter infrared light in the required wavelength range by applying a single type of infrared sensor.

[0005] Of course, as in Korean Patent Publication No. 10-2023-0013530, a technology is disclosed to derive an infrared spectrum by dispersing infrared rays by wavelength or type through a single spectral filter, but this is merely a technology related to a spectrometer that disperses infrared rays by wavelength.

[0006] In other words, up to now, no technology has been developed to extract more objective and accurate information about an object by sensing infrared rays with different sensors according to wavelength. However, especially with the recent advancement of infrared camouflage technology, the need for related technology to neutralize such camouflage technology is increasing.

[0007] Related prior art documents include U.S. Patent No. 10764515, U.S. Patent No. 9848118, and Republic of Korea Publication No. 10-2023-0013530.

[0008] Accordingly, the technical problem of the present invention is conceived from this point, and the purpose of the present invention is to provide a wavelength-selective infrared sensor-based thermal image colorization system capable of implementing infrared colorization in response to infrared camouflage by maximizing visibility using a wavelength-selective infrared sensor having two or more degrees of freedom.

[0009] In addition, another object of the present invention is to provide a thermal image colorization method using the thermal image colorization system.

[0010] A thermal image colorization system according to one embodiment for realizing the above-described object of the present invention includes a measurement unit and a calculation unit. The measurement unit includes an infrared sensor unit that selectively senses infrared rays of different wavelength ranges with respect to infrared rays incident from a target object. The calculation unit includes a color conversion processing unit that matches colors of each thermal image with respect to infrared rays of different wavelength ranges based on the sensed results of the infrared sensor unit, thereby imaging infrared rays of different wavelength ranges.

[0011] In one embodiment, the color conversion processing unit can generate thermal images for each infrared ray in the different wavelength ranges, match a predetermined primary color for each thermal image, and perform imaging of the target object using the matched primary color.

[0012] In one embodiment, the color conversion processing unit can match the primary colors so that the color distance between pixels in the entire image or a region of interest within the image is maximized when matching the primary colors.

[0013] In one embodiment, the color conversion processing unit can match the sensed signals to R, G, and B when all three sensed signals are different from the sensed results of the infrared sensor unit.

[0014] In one embodiment, the color conversion processing unit, when the difference between two of the three sensed signals in the sensed results of the infrared sensor unit is relatively large, can match two of the sensed signals to complementary colors and match the remaining one sensed signal to black and white colors.

[0015] In one embodiment, the infrared sensor unit may include a sensor unit including sensors that selectively sense infrared rays of different wavelength ranges, and a base substrate on which the sensor unit is mounted and on which a circuit for transmitting signals sensed by each of the sensors to the color conversion processing unit is formed.

[0016] In one embodiment, at least two of the sensors may be positioned spaced apart from each other.

[0017] In one embodiment, the sensors are arranged such that at least two or more of them overlap each other along the incident direction of the infrared rays, and the sensor positioned above along the incident direction of the infrared rays can transmit infrared rays in a wavelength range measured by the sensor positioned below.

[0018] In one embodiment, the sensor may vary the infrared wavelength it senses depending on an input signal input from the base substrate.

[0019] In one embodiment, the filter may include a plurality of materials having different refractive indices laminated in multiple layers.

[0020] In one embodiment, the filter may be formed by multi-layering at least one of germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), barium fluoride (BaF2), magnesium fluoride (MgF2), potassium bromide (KBr), potassium chloride (KCl), sodium chloride (NaCl), and ytterbium fluoride (YbF3) on a germanium (Ge) substrate. In addition, the filter substrate may include at least one of germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), barium fluoride (BaF2), magnesium fluoride (MgF2), potassium bromide (KBr), potassium chloride (KCl), sodium chloride (NaCl), and ytterbium fluoride (YbF3).

[0021] In one embodiment, the infrared sensor unit may include a filter that selectively transmits infrared rays of different wavelength ranges, a filter substrate on which the filter is mounted, a sensor unit that includes a sensor aligned with the filter and that senses infrared rays of a specific wavelength that have passed through the filter, and a base substrate on which the sensor unit is mounted and on which a circuit for transmitting a signal sensed by each of the sensors to the color conversion processing unit is formed.

[0022] In one embodiment, the filters may be positioned so as to be spaced apart from each other in at least two numbers, and the sensors may be provided in at least two numbers to be aligned with each of the spaced apart filters.

[0023] In one embodiment, the filter may have a wavelength of infrared light that is transmitted that varies depending on an input signal input from the filter substrate, and the sensor may be provided on the sensor unit so as to be aligned with the filter.

[0024] In one embodiment, the filter comprises at least two filters, each having a width equal to the width of the base substrate, and the filter substrate is capable of moving horizontally over the base substrate to change the filters overlapping the base substrate.

[0025] In one embodiment, the infrared sensor unit may include a first filter that selectively transmits infrared rays of different wavelength ranges, a first filter substrate on which the first filter is mounted, a second filter that selectively transmits infrared rays of a different wavelength range from the first filter, a second filter substrate disposed below the first filter substrate on which the second filter is mounted, a sensor unit that includes a sensor that is aligned with the first and second filters and senses infrared rays of a specific wavelength that has passed through the first and second filters, and a base substrate on which the sensor unit is mounted and on which a circuit for transmitting a signal sensed by each of the sensors to the color conversion processing unit is formed.

[0026] In one embodiment, the first filter includes at least two filters each having a width as large as the width of the base substrate, the second filter also includes at least two filters each having a width as large as the width of the base substrate, and each of the first and second filter substrates can be moved horizontally on top of the base substrate to change the filters overlapping the base substrate.

[0027] In one embodiment, the sensor units may be mounted in a matrix arrangement in multiple numbers on the base substrate.

[0028] A thermal image colorization method according to one embodiment for realizing the above-described object of the present invention includes a step of selectively sensing infrared rays of different wavelength ranges for infrared rays incident from a target object, a step of generating thermal image images for each infrared ray of different wavelength ranges for the sensed infrared ray, a step of matching a predetermined primary color to each thermal image, and a step of performing imaging of the target object with the matched primary color.

[0029] In one embodiment, in the step of matching the primary colors, the primary colors may be matched so that the color distance of pixels within the entire image or a region of interest within the image is maximized.

[0030] According to embodiments of the present invention, by imaging infrared rays of different wavelength ranges with visible light of different colors, more accurate identification of objects that cannot be distinguished by simple infrared thermal images can be achieved.

[0031] That is, by sensing infrared rays of different wavelength ranges by applying different sensors or different filters, a thermal image is acquired for each infrared wavelength range, and by matching a predetermined visible light color to the acquired thermal image, visible light imaging can be performed on infrared rays acquired from a target object. In particular, visible light imaging can be implemented for an infrared camouflaged target object, thereby improving the identification ability of the target object.

[0032] In this case, the arrangement of sensors for distinguishing and sensing infrared rays of different wavelength ranges can be configured in various ways, and similarly, the arrangement of filters for transmitting infrared rays of different wavelength ranges can also be configured in various ways, so that by applying various sensors and filters, thermal images for infrared rays can be extracted by wavelength.

[0033] FIG. 1 is a block diagram illustrating a thermal imaging colorization system according to one embodiment of the present invention.

[0034] Figure 2 is a schematic diagram illustrating the infrared sensor unit of Figure 1.

[0035] FIG. 3 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0036] FIG. 4 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0037] FIG. 5 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0038] Figure 6 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0039] Figure 7 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0040] Figure 8 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0041] Fig. 9a is a graph showing an example of the spectrum for each sensor of the infrared sensor unit of Figs. 2 to 4, and Fig. 9b is a graph showing the transmission spectrum for each filter of the infrared sensor unit of Figs. 5 to 8.

[0042] Figure 10 is a flowchart showing each step and each step result of a thermal image colorization method using the thermal image colorization system of Figure 1.

[0043] Fig. 11a is an example of a visible light image of an actual camouflaged object, Fig. 11b is an image of a measurement result of an infrared sensor according to a prior art for the camouflaged object of Fig. 11a, and Fig. 11c is an image of a thermal image colorization result of Fig. 10 for the camouflaged object of Fig. 11a.

[0044] Figure 12a is an example of a conventional thermal image of an infrared camouflaged object, and Figure 12b is an example of an image in which the infrared camouflaged object is detected and identified.

[0045] <Explanation of symbols>

[0046] 10: Thermal imaging colorization system 50: Infrared

[0047] 60: Infrared lens 100: Measuring unit

[0048] 110: Cooling section

[0049] 200, 201, 202, 203, 204, 205, 206: Infrared sensor section

[0050] 210, 220, 230, 240, 250, 260, 270: Sensor Unit

[0051] 290: Base substrate 291, 292, 293, 294: Filter substrate

[0052] 300: Operation unit 310: Color conversion processing unit

[0053] 320: Display section 330: Control section

[0054]

[0055] The present invention is susceptible to various modifications and takes various forms, and thus embodiments are described in detail herein. However, this is not intended to limit the present invention to a specific disclosed form, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Similar reference numerals have been used to designate similar components throughout the description of each drawing. While terms such as "first," "second," etc. may be used to describe various components, these components should not be limited by these terms.

[0056] The above terms are used solely to distinguish one component from another. The terms used in this application are used solely to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0057] In this application, it should be understood that terms such as “comprise” or “consist of” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0058] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0059] Hereinafter, with reference to the attached drawings, a preferred embodiment of the present invention will be described in more detail.

[0060] FIG. 1 is a block diagram illustrating a thermal imaging colorization system according to one embodiment of the present invention.

[0061] Referring to FIG. 1, the thermal image colorization system (10) according to the present embodiment includes a measuring unit (100) and an operating unit (300). The measuring unit (100) includes an infrared lens (60), a cooling unit (110), and an infrared sensor unit (200), and the operating unit (300) includes a color conversion processing unit (310), a control unit (330), and a display unit (320).

[0062] That is, infrared rays generated from a target object (not shown) are incident on the infrared sensor unit (200) through the infrared lens (60) from the outside of the measuring unit (100).

[0063] At this time, the infrared sensor unit (200), although detailed embodiments will be described later, is a wavelength-selective infrared sensor, and distinguishes the wavelength range of the incident infrared rays, and each sensor performs sensing for different wavelengths by distinguishing between them.

[0064] That is, the infrared sensor unit (200) includes at least two sensors that detect at least two different infrared wavelength ranges, and through this, at least two different infrared wavelength ranges can be sensed through each different sensor.

[0065] At this time, the number of infrared wavelength regions detected separately from each other is sufficient if there are at least two, and the number is not limited. In addition, the number of sensors included in the infrared sensor unit (200) can also be determined depending on the number of infrared wavelength regions detected separately from each other.

[0066] The specific infrared sensor unit (200) will be described later.

[0067] The cooling unit (110) may be optionally provided. For example, if the infrared sensor unit (200) includes a photoelectric sensor used for measuring infrared rays in the range of 3 to 5 μm, which is mid-infrared, the cooling unit (110) must be provided as a thermoelectric cooler. However, if the infrared sensor unit (200) includes a bolometer sensor used for measuring infrared rays in the range of 7 to 14 μm, which is far-infrared, the cooling unit (110) may be omitted.

[0068] The above color conversion processing unit (310) processes the signal sensed by the infrared sensor unit (200) and converts it into an image. The specific details of the image processing in the color conversion processing unit (310) will be described with reference to FIG. 10 described below.

[0069] The display unit (320) displays the image processing result from the color conversion processing unit (310) to the outside, and through the display unit (320), the user can identify an image in which an infrared signal obtained from the target object is visualized.

[0070] The above control unit (330) controls various operations of the color conversion processing unit (310), the display unit (320), and the infrared sensor unit (200).

[0071] Below, first, a specific configuration for individually performing infrared sensing for infrared rays of different wavelength ranges through the infrared sensor unit (200) will be described.

[0072] Figure 2 is a schematic diagram illustrating the infrared sensor unit of Figure 1.

[0073] Referring to FIG. 2, the infrared sensor unit (200) in the present embodiment includes a base substrate (290) and a plurality of sensor units (210) mounted on the base substrate (290).

[0074] At this time, the sensor units (210) can be mounted in a matrix arrangement on the base substrate (290) in numbers M*L (M and L are each natural numbers), as shown.

[0075] The above base substrate (290) is a predetermined circuit board, and a circuit is formed to transmit signals sensed by each of the sensor units (210) to the color conversion processing unit (310), and further, if necessary, an electric signal for the operation of the sensor units (210) may be transmitted.

[0076] Each of the above sensor units (210) includes three different sensors (211, 212, 213) that are spaced apart from each other, as illustrated. At this time, although the drawing illustrates that three different sensors (211, 212, 213) are arranged, the sensors (211, 212, 213) may be arranged in two or four or more, and are not necessarily limited to three. However, for the convenience of explanation, the following description illustrates an example in which not only the sensors but also the filters described below are all configured in three units.

[0077] Furthermore, the three sensors (211, 212, 213) are represented as R (red), G (green), and B (blue), respectively, and are depicted as sensing red, green, and blue in visible light. However, this is for convenience of explanation and understanding, and since they are not sensors that sense visible light, they are not sensors that sense red, green, and blue light.

[0078] However, each of the three sensors (211, 212, 213) senses infrared rays of different wavelength ranges with respect to the incident infrared rays (50), similar to sensing visible light of different wavelengths, such as red light, green light, and blue light.

[0079] That is, referring to FIG. 9a described below, the first sensor (211) can sense infrared rays between a first wavelength (λ1) and a second wavelength (λ2) with respect to the infrared ray (50), the second sensor (212) can sense infrared rays between a second wavelength (λ2) and a third wavelength (λ3) with respect to the infrared ray (50), and the third sensor (213) can sense infrared rays between a third wavelength (λ3) and a fourth wavelength (λ4) with respect to the infrared ray (50).

[0080] In this case, the first to fourth wavelengths can be arbitrarily selected from the wavelength range belonging to the infrared ray (50), and do not necessarily need to be set at equal intervals.

[0081] In addition, the first to third sensors (211, 212, 213) may be arranged in a rectangular shape that is formed lengthwise on one sensor unit (210) as shown, but are not limited thereto, and may be arranged in various shapes such as triangles, circles, ovals, and other shapes.

[0082] As described above, the first to third sensors (211, 212, 213) can be arranged in an arbitrary array structure and shape on one sensor unit (210), and the ranges of infrared wavelengths that each of them senses are different from each other, and through this, infrared rays of different wavelength ranges are sensed and provided to the color conversion processing unit (310).

[0083] FIG. 3 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0084] The thermal image colorization system according to the present embodiment is substantially the same as the thermal image colorization system (10) described with reference to FIGS. 1 and 2 except for the structure of the sensor unit (220), so redundant descriptions are omitted.

[0085] Referring to FIG. 3, in the thermal image colorization system of the present embodiment, the infrared sensor unit (201) includes a base substrate (290) and a sensor unit (220).

[0086] In this case, the sensor unit (220) can be mounted in a matrix arrangement on the base substrate (290) in numbers M*L (M and L are each natural numbers), as shown.

[0087] Additionally, each sensor unit (220) includes at least two sensors (221, 222, 223) that are stacked on top of each other.

[0088] That is, unlike the first to third sensors (221, 222, 223) which are arranged to be spaced apart from each other and overlap each other in FIG. 2, they occupy most of the area of ​​the sensor unit (220) and overlap each other along the direction in which the infrared rays (50) are incident.

[0089] At this time, the first sensor (221) can sense infrared rays (first section) between the first wavelength (λ1) and the second wavelength (λ2) with respect to the infrared rays (50), as shown in FIG. 9a, the second sensor (222) can sense infrared rays (second section) between the second wavelength (λ2) and the third wavelength (λ3) with respect to the infrared rays (50), and the third sensor (223) can sense infrared rays (third section) between the third wavelength (λ3) and the fourth wavelength (λ4) with respect to the infrared rays (50).

[0090] Furthermore, since the first to third sensors (221, 222, 223) have a structure in which they are stacked with each other and the infrared wavelength ranges they sense are different from each other, the first sensor (221) must be able to transmit wavelength ranges other than the first section, and similarly, the second sensor (222) must be able to transmit wavelength ranges other than the second section. Thus, the first to third sensors (221, 222, 223) can sequentially perform sensing of infrared rays in different wavelength ranges.

[0091] As described above, as the first to third sensors (221, 222, 223) are formed by overlapping each other, the area occupied by each sensor increases compared to FIG. 2, thereby improving the sensitivity of the sensor.

[0092] FIG. 4 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0093] The thermal image colorization system according to the present embodiment is substantially the same as the thermal image colorization system (10) described with reference to FIGS. 1 and 2 except for the structure of the sensor unit (230), so redundant descriptions are omitted.

[0094] Referring to FIG. 4, in the thermal imaging colorization system of the present embodiment, the infrared sensor unit (202) includes a base substrate (290) and a sensor unit (230).

[0095] In this case, the sensor unit (230) can be mounted in a matrix arrangement on the base substrate (290) in numbers M*L (M and L are each natural numbers), as shown.

[0096] Additionally, each sensor unit (230) is composed of one variable sensor (231). At this time, the area of ​​the variable sensor (231) may occupy most of the area of ​​the sensor unit (220).

[0097] The above variable sensor (231) measures a variable infrared wavelength depending on the input signal, and the variation of the signal input to the variable sensor (231) through the base substrate (290) can be preset and controlled.

[0098] Thus, when the variable sensor (231) receives a first signal, as shown in FIG. 9a, the variable sensor (231) can sense infrared rays (first section) between a first wavelength (λ1) and a second wavelength (λ2) with respect to the infrared ray (50), and when the variable sensor (231) receives a second signal, the variable sensor (231) can sense infrared rays (second section) between a second wavelength (λ2) and a third wavelength (λ3) with respect to the infrared ray (50), and further, when the variable sensor (231) receives a third signal, the variable sensor (231) can sense infrared rays (third section) between a third wavelength (λ3) and a fourth wavelength (λ4) with respect to the infrared ray (50).

[0099] As described above, since the variable sensor (231) senses infrared rays of different wavelength ranges according to the input signal, infrared rays of a required wavelength range can be selectively sensed, and since the area occupied by the variable sensor (231) as a whole is formed relatively wide as in FIG. 3, the sensitivity of the sensor can be improved.

[0100] In the case of the above thermal imaging colorization system, the sensor unit constituting the infrared sensor section was a sensor that directly detected infrared rays at different wavelengths, but in the case of the thermal imaging colorization system described below, a filter that transmits only infrared rays of a specific wavelength is additionally provided at the front end of the sensor, and infrared rays are detected through the sensor after only the specific wavelength is selectively transmitted through the filter.

[0101] FIG. 5 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0102] Referring to FIG. 5, the infrared sensor unit (203) in the present embodiment includes a base substrate (290), a plurality of sensor units (240) mounted on the base substrate (290), a filter substrate (291) positioned on the upper portion of the base substrate (290), and a plurality of filters mounted on the filter substrate (291).

[0103] As described above, the base substrate (290) is a predetermined circuit board, and a circuit for transmitting a signal sensed by each of the sensor units (240) to the color conversion processing unit (310) is formed thereon. Furthermore, if necessary, an electric signal for the operation of the sensor units (240) may be transmitted.

[0104] At this time, the sensor units (240) can be mounted in a matrix arrangement on the base substrate (290) in numbers M*L (M and L are each natural numbers), as shown.

[0105] In addition, each of the sensor units (240) includes three sensors (241, 242, 243) spaced apart from each other, as illustrated. In this case, although the drawing illustrates three different sensors (241, 242, 243) arranged, the sensors (241, 242, 243) may be arranged in two or four or more, and are not necessarily limited to three. However, for the convenience of explanation, the following description will illustrate an example in which not only the sensors but also the filters described below are all configured in three units.

[0106] Furthermore, the three sensors (241, 242, 243) are sensors that sense ultraviolet rays that have passed through the filter described below, respectively, and as shown in Fig. 2, there is no need to sense only ultraviolet rays of a specific wavelength range. That is, since only ultraviolet rays of a specific wavelength range have already been selectively transmitted through the filter described below, it is sufficient to sense the transmitted ultraviolet rays.

[0107] The above filter substrate (291) is placed on the upper side of the base substrate (290), that is, on the front side toward the direction in which the infrared ray (50) is incident, and a plurality of filters (244, 245, 246) are mounted on the filter substrate (291).

[0108] In the present embodiment, the first to third filters (244, 245, 246) are arranged adjacent to each other as one filter unit, and the filter unit in which these first to third filters are bundled can be mounted in a matrix arrangement, M*L (M and L are each natural numbers), on the filter substrate (291) like the sensor unit (240). Thus, the filter unit and the sensor unit (240) are aligned in a row along the direction in which the infrared ray (50) is incident.

[0109] Furthermore, the first filter (244) is aligned in a line with the first sensor (241) along the direction in which the infrared ray (50) is incident, and similarly, the second filter (245) is aligned with the second sensor (242) and the third filter (246) is aligned with the third sensor (243).

[0110] At this time, the first to third filters (244, 245, 246) selectively transmit only infrared rays of different wavelengths, similarly to how the first to third sensors (211, 212, 213) in FIG. 2 sense infrared rays of different wavelengths. Thus, only infrared rays of wavelengths transmitted through each filter are sensed by the sensors located at the rear end.

[0111] That is, referring to FIG. 9b described below, for example, the first filter (244) can transmit only the first wavelength range (7 to 9 μm) for the infrared ray (50), the second filter (245) can transmit only the second wavelength range (9 to 11 μm) for the infrared ray (50), and the third filter (246) can transmit only the third wavelength range (11 to 13 μm) for the infrared ray (50).

[0112] In this case, the first to third wavelength ranges can be arbitrarily selected from the wavelength region belonging to the infrared ray (50), and do not necessarily need to be set at equal intervals.

[0113] In addition, the first to third filters (244, 245, 246) and the first to third sensors (241, 242, 243) may be arranged in a rectangular shape that is formed lengthwise as shown, but are not limited thereto, and may be arranged in various shapes such as triangles, circles, ovals, and other shapes.

[0114] As described above, the first to third filters (244, 245, 246) and the first to third sensors (241, 242, 243) can be arranged in any arrangement structure and shape, and the ranges of infrared wavelengths sensed by each of them are different from each other, through which infrared rays of different wavelength ranges are sensed and provided to the color conversion processing unit (310).

[0115] Meanwhile, each of the first to third filters (244, 245, 246) can perform a predetermined filtering function as described above by laminating multiple materials having different refractive indices in multiple layers. For example, the filters can be manufactured by laminating at least one of germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), barium fluoride (BaF2), magnesium fluoride (MgF2), potassium bromide (KBr), potassium chloride (KCl), sodium chloride (NaCl), and ytterbium fluoride (YbF3) in multiple layers on a germanium (Ge) substrate.

[0116] In this case, the filter substrate (291) may include at least one of germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), barium fluoride (BaF2), magnesium fluoride (MgF2), potassium bromide (KBr), potassium chloride (KCl), sodium chloride (NaCl), and ytterbium fluoride (YbF3).

[0117] Figure 6 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0118] The thermal image colorization system according to the present embodiment is substantially the same as the thermal image colorization system described with reference to FIG. 5 except for the arrangement and structure of the filters, so redundant description is omitted.

[0119] Referring to FIG. 6, in the thermal image colorization system of the present embodiment, the infrared sensor unit (204) includes a base substrate (290), sensor units (250), a filter substrate (292), and filters (252, 253, 254).

[0120] At this time, the base substrate (290) is the same as the base substrate in FIG. 5, and the sensor units (250) can be mounted in a matrix arrangement, M*L (M and L are each natural numbers), on the base substrate (290) as shown.

[0121] In addition, each of the sensor units (250) is equipped with one sensor (251), and the sensor (251) can occupy most of the area of ​​the sensor unit (250).

[0122] The above sensor (251) is a sensor that senses ultraviolet rays that have passed through the filter described below, and as described in FIG. 5, it is not necessary to sense only ultraviolet rays of a specific wavelength range. That is, since only ultraviolet rays of a specific wavelength range have already been selectively transmitted through the filter described below, it is sufficient to sense the transmitted ultraviolet rays.

[0123] Furthermore, as illustrated, the filter substrate (292) is formed on the upper side of the base substrate (290), that is, on the front side in the direction in which the infrared rays (50) are incident, with a larger area than the base substrate (290), and different filters (252, 253, 254) that transmit only different infrared wavelength regions are formed on the filter substrate (292).

[0124] At this time, if three different filters are formed on the filter substrate (292), the overall area of ​​the filter substrate (292) can be formed to be approximately three times larger than that of the base substrate (290).

[0125] In contrast, although not shown, if two different filters are formed on the filter substrate (292), the area of ​​the filter substrate (292) can be formed to be about twice as large as that of the base substrate (290).

[0126] In the present embodiment, the first to third filters (252, 253, 254) formed on the filter substrate (292) can transmit infrared rays of different wavelength ranges, similarly to the first to third filters (244, 245, 246) described in FIG. 5.

[0127] That is, referring to FIG. 9b described below, for example, the first filter (252) can transmit only the first wavelength range (7 to 9 μm) for the infrared ray (50), the second filter (253) can transmit only the second wavelength range (9 to 11 μm) for the infrared ray (50), and the third filter (254) can transmit only the third wavelength range (11 to 13 μm) for the infrared ray (50).

[0128] In this case, as described above, the first to third wavelength ranges can be arbitrarily selected from the wavelength region belonging to the infrared ray (50), and do not necessarily need to be set at equal intervals.

[0129] Thus, in the case of the present embodiment, the filter substrate (292) on which the first to third filters (252, 253, 254) are formed is positioned and moved left and right, i.e. in the longitudinal direction, with respect to the base substrate (290), as shown by the arrow.

[0130] Accordingly, when the first filter (252) and the base substrate (290) are arranged to be aligned with each other along the incident direction of the infrared rays (50), only the first wavelength range (7 to 9 μm) of the infrared rays is transmitted, so that only the infrared rays of the corresponding wavelength can be sensed by the sensor (251).

[0131] In contrast, when the second filter (253) and the base substrate (290) are arranged to be aligned with each other along the incident direction of the infrared rays (50), only the second wavelength range (9 to 11 μm) of the infrared rays is transmitted, so that only the infrared rays of the corresponding wavelength can be sensed by the sensor (251).

[0132] Furthermore, when the third filter (254) and the base substrate (290) are arranged to be aligned with each other along the incident direction of the infrared rays (50), only the third wavelength range (11 to 13 μm) of the infrared rays is transmitted, so that only the infrared rays of the corresponding wavelength can be sensed by the sensor (251).

[0133] As described above, since the filter substrate (292) is moved left-right or in the length direction, and only a certain filter is aligned on the base substrate (290), only infrared rays of a specific wavelength can be sensed, so that infrared rays can be sensed over a wider area, thereby further improving the infrared sensing sensitivity.

[0134] Furthermore, signals sensed for different infrared wavelength regions according to the movement of the filter substrate (292) are provided to the color conversion processing unit (310).

[0135] Figure 7 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0136] The thermal image colorization system according to the present embodiment is substantially the same as the thermal image colorization system described with reference to FIG. 6 except for the arrangement and structure of the filter, so redundant description is omitted.

[0137] Referring to FIG. 7, in the thermal image colorization system of the present embodiment, the infrared sensor unit (205) includes a base substrate (290), sensor units (260), a first filter substrate (293), a second filter substrate (294), first filters (262, 263, 264), and second filters (265, 266, 267).

[0138] At this time, the base substrate (290) is the same as the base substrate in FIG. 5, and the sensor units (260) can be mounted in a matrix arrangement, M*L (M and L are each natural numbers), on the base substrate (290) as shown.

[0139] In addition, each of the sensor units (260) is equipped with one sensor (261), and the sensor (261) can occupy most of the area of ​​the sensor unit (260).

[0140] The above sensor (261) is a sensor that senses ultraviolet rays that have passed through the filter described below, and as described in FIG. 5, it is not necessary to sense only ultraviolet rays of a specific wavelength range. That is, since only ultraviolet rays of a specific wavelength range have already been selectively transmitted through the filter described below, it is sufficient to sense the transmitted ultraviolet rays.

[0141] In the present embodiment, a pair of first and second filter substrates (293, 294) are sequentially formed on the upper portion of the base substrate (290), i.e., on the front side in the direction in which the infrared ray (50) is incident. That is, the infrared ray (50) is sequentially filtered by passing through the first filter substrate (293) and the second filter substrate (294), and then provided to the sensor unit (260) of the base substrate (290).

[0142] In addition, three different filters (262, 263, 264) are formed on the first filter substrate (293), and three different filters (265, 266, 267) are formed on the second filter substrate (294). Of course, as explained above, the number of filters formed can vary.

[0143] At this time, if three different filters are formed on the first filter substrate (293), the overall area of ​​the first filter substrate (293) can be formed to be approximately three times larger than that of the base substrate (290). The same applies to the second filter substrate (294).

[0144] In the present embodiment, three different filters (262, 263, 264) formed on the first filter substrate (293) can transmit infrared rays of different wavelength ranges, similarly to the first to third filters (252, 253, 254) described in FIG. 6.

[0145] Likewise, the three different filters (265, 266, 267) formed on the second filter substrate (294) can also transmit infrared rays of different wavelength ranges.

[0146] At this time, the wavelength ranges of infrared rays transmitted by the three different filters (262, 263, 264) formed on the first filter substrate (293) and the three different filters (265, 266, 267) formed on the second filter substrate (294) may all be different.

[0147] Of course, as explained above, in the infrared wavelength region transmitted by the six filters (262, 263, 264, 265, 266, 267) formed on each of the first and second filter substrates (293, 294), each wavelength region can be arbitrarily selected within the range of the infrared wavelength region, and it is not necessary to set them at the same interval.

[0148] In addition, in the present embodiment, each of the first filter substrate (293) and the second filter substrate (294) is independently moved and positioned in the left-right direction, i.e., in the longitudinal direction, with respect to the base substrate (290), as shown by the arrows.

[0149] As described above, if the first and second filter substrates (293, 294), each of which has three filters formed thereon, are moved left and right on the base substrate (290), the transmitted infrared wavelength range can be ultimately subdivided into a total of 15 filter combinations. That is, if the first filter substrate (293) includes X filters and the second filter substrate (294) includes Y filters, the transmitted wavelength range can be determined by a total of (X+1)*(Y+1)-1 combinations. At this time, in determining the wavelength range, no filter may be selected for the first filter substrate (293), and similarly, no filter may be selected for the second filter substrate (294). That is, the first filter substrate (293) includes three filters, but allows a total of four selections, including an area without a filter, and similarly, the second filter substrate (294) includes three filters, but allows a total of four selections, including an area without a filter.

[0150] As described above, the first and second filter substrates (293, 294) are independently moved left and right or in the length direction, so that the selected filters are sequentially arranged on the base substrate (290), and sensing can be performed through the sensor (261) for the transmission infrared wavelength selected by the combination of the filters. Thus, not only can the infrared sensing be performed over a wider area for a specific wavelength range, but also the infrared sensing sensitivity can be further improved because the range of the infrared transmission wavelength can be selected more diversely, so that the discrimination ability during infrared visualization can be further improved.

[0151] Furthermore, signals sensed for different infrared wavelength regions according to the movement of the first and second filter substrates (293, 294) are provided to the color conversion processing unit (310).

[0152] Figure 8 is a schematic diagram illustrating an infrared sensor unit of a thermal imaging colorization system according to another embodiment of the present invention.

[0153] The thermal image colorization system according to the present embodiment is substantially the same as the thermal image colorization system described with reference to FIG. 6 except for the arrangement and structure of the filter, so redundant description is omitted.

[0154] Referring to FIG. 8, in the thermal image colorization system of the present embodiment, the infrared sensor unit (206) includes a base substrate (290), sensor units (270), a filter substrate (295), and a filter (272).

[0155] At this time, the base substrate (290) is a base substrate as in FIG. 5, and the sensor units (270) can be mounted in a matrix arrangement, M*L (M and L are each natural numbers), on the base substrate (290) as shown.

[0156] In addition, each of the sensor units (270) is equipped with one sensor (271), and the sensor (271) can occupy most of the area of ​​the sensor unit (270).

[0157] The above sensor (271) is a sensor that senses ultraviolet rays that have passed through the filter described below, and as described in FIG. 5, it is not necessary to sense only ultraviolet rays of a specific wavelength range. That is, since only ultraviolet rays of a specific wavelength range have already been selectively transmitted through the filter described below, it is sufficient to sense the transmitted ultraviolet rays.

[0158] The above filter substrate (295) is placed on the upper side of the base substrate (290), that is, on the front side facing the direction in which the infrared ray (50) is incident, and a plurality of variable filters (272) are mounted on the filter substrate (295).

[0159] In this case, the variable filters (272) can be mounted in a matrix arrangement on the filter substrate (295) in the same manner as the sensor unit (270), M*L (M and L are each natural numbers).

[0160] Thus, each of the variable filters (272) and each of the sensor units (270) can have a so-called one-to-one correspondence arrangement relationship, in which they are arranged in a line along the direction in which the infrared rays (50) are incident.

[0161] Each of the above variable filters (272) is similar to the variable sensor (231) described in the previous FIG. 4, and the wavelength of infrared rays transmitted varies depending on the input signal, so that the variation of the signal input to the variable filter (272) through the filter substrate (295) can be preset and controlled.

[0162] Thus, as the variable filter (272) receives a first signal, as shown in FIG. 9b, the variable filter (272) can transmit only the first wavelength range (7 to 9 μm) for the infrared ray (50), as the variable filter (272) receives a second signal, the variable filter (272) can transmit only the second wavelength range (9 to 11 μm) for the infrared ray (50), and further, as the variable filter (272) receives a third signal, the variable filter (272) can transmit only the third wavelength range (11 to 13 μm) for the infrared ray (50).

[0163] As described above, as the variable filter (272) transmits infrared rays of different wavelength ranges depending on the input signal, the sensor (271) located at the rear end can selectively sense the transmitted infrared rays.

[0164] Furthermore, infrared rays of different wavelength ranges sensed through the sensor unit (270) are provided to the color conversion processing unit (310).

[0165] Fig. 9a is a graph showing an example of the spectrum for each sensor of the infrared sensor unit of Figs. 2 to 4, and Fig. 9b is a graph showing the transmission spectrum for each filter of the infrared sensor unit of Figs. 5 to 8.

[0166] As in FIG. 9a, the different sensors used in the embodiments of FIGS. 2 to 5 above can be configured to have high sensitivity to different infrared wavelengths depending on each sensor, and as in FIG. 9b, the different filters used in the embodiments of FIGS. 6 to 8 above can be configured to have high transmittance to different infrared wavelengths depending on each filter.

[0167] Figure 10 is a flowchart showing each step and each step result of a thermal image colorization method using the thermal image colorization system of Figure 1.

[0168] Referring to FIG. 10, in the thermal image colorization method using the thermal image colorization system (10) of FIG. 1, first, infrared rays of different wavelength ranges are sensed with respect to infrared rays incident from a target object through the infrared sensor unit (200) (step S10).

[0169] At this time, although sensing through the infrared sensor unit (200) of FIG. 2 is illustrated through FIG. 10, it is not limited thereto, and colorization of thermal images is also possible for infrared rays sensed through each of the infrared sensor units described in FIGS. 3 to 8.

[0170] After this, the color conversion processing unit (310) generates thermal images for infrared rays of different wavelength ranges for infrared rays of different wavelength ranges sensed in this manner (step S20).

[0171] At this time, the infrared images generated for each infrared ray in each different wavelength region can be configured as a matrix. That is, if N sensors for sensing infrared ray in each of N different wavelength regions are provided within the sensor unit (210), and the sensor units are arranged in M*L(=S) matrices on the base substrate (290), the thermal image for each infrared ray can be derived as a matrix of the following equation (1).

[0172]

[0173] After this, the color conversion processing unit (310) corresponds the N thermal image images (S) to N primary colors and performs color matching for each thermal image (step S30).

[0174] At this time, the primary color may be a color corresponding to visible light, and the type of matching color is not limited. For example, for the case where N = 3, each S (1) , S (2) and S (3) can be mapped to R(red), G(green), and B(blue).

[0175] That is, for the case where N=3, each S (1) , S (2) and S (3) If we implement a color, i.e. a visible light image, by corresponding R(red), G(green) and B(blue), the RGB color coordinates of the (i, j)th pixel are It becomes.

[0176] While the types of colors used for matching the primary colors are not limited, in order to further enhance the visibility or distinguishability of the target object beyond simple color expression, it is necessary to select a primary color appropriate for the measurement background environment. To this end, a color combination that maximizes the color distance between the background environment color and the object can be selected. Furthermore, when the wavelength characteristics of the target object are unknown (i.e., an unknown object), a color combination with high average visibility can be selected by considering a database containing general object information. Accordingly, a processor for such color combinations may be additionally included, and the user may also directly specify the primary color.

[0177] More specifically, when performing the matching with the primary colors, the primary colors can be matched so that the color distance between pixels in the entire image or within a region of interest (ROI) within the image is maximized. Through this, colorization processing can be performed so as to maximize visibility in the entire image or within a region of interest within the image.

[0178] For example, if the signals sensed from sensors 1 to 3 within the region of interest are all different, the signals from sensors 1 to 3 can be matched to R, G, and B, respectively.

[0179] In contrast, when the difference between the signals of sensor 1 and sensor 2 among the sensors 1 to 3 is large (the signal of sensor 3 is similar to the signal of either sensor 1 or sensor 2), sensor 1 and sensor 2 can be matched with complementary colors (the color that becomes white when two colors with the greatest color distance are combined), and sensor 3 can be matched with black and white colors.

[0180] After this, the color conversion processing unit (310) integrates the image matched to the primary color to perform thermal imaging, i.e., color imaging, of the target object (step S40).

[0181] Fig. 11a is an example of a visible light image of an actual camouflaged object, Fig. 11b is an image of a measurement result of an infrared sensor according to a prior art for the camouflaged object of Fig. 11a, and Fig. 11c is an image of a thermal image colorization result of Fig. 10 for the camouflaged object of Fig. 11a.

[0182] As in Fig. 11a, when a target object (tank) on which infrared camouflage is performed is located on a target environment of a ground environment where dirt is randomly sprinkled, it is difficult to accurately identify the target object through a visible light image of the target object and the ground environment.

[0183] In addition, as shown in Fig. 11b, even if a thermal image of the target object and the ground environment is acquired through a conventional thermal imaging camera, i.e., a commercial thermal imaging camera with one degree of freedom, it can be confirmed that it is difficult to distinguish between the camouflaged target object and the surrounding environment.

[0184] However, as shown in Fig. 11c, through the thermal image colorization method according to the present embodiment, it can be confirmed that the camouflaged object (tank) is clearly distinguished from the surrounding environment by obtaining a thermal image in color for the target object and the ground environment.

[0185] Figure 12a is an example of a conventional thermal image of an infrared camouflaged object, and Figure 12b is an example of an image in which the infrared camouflaged object is detected and identified.

[0186] That is, as shown in Fig. 12a, it is difficult to identify an infrared camouflaged object using a conventional thermal image. However, as shown in Fig. 12b, it can be confirmed that detection and identification of an infrared camouflaged portion is possible through the thermal image colorization method according to the present embodiment.

[0187] According to the embodiments of the present invention as described above, by imaging infrared rays of different wavelength ranges into visible light of different colors, more accurate identification of a target object that cannot be distinguished by a simple infrared thermal image can be achieved.

[0188] That is, by sensing infrared rays of different wavelength ranges by applying different sensors or different filters, a thermal image is acquired for each infrared wavelength range, and by matching a predetermined visible light color to the acquired thermal image, visible light imaging can be performed on infrared rays acquired from a target object. In particular, visible light imaging can be implemented for an infrared camouflaged target object, thereby improving the identification ability of the target object.

[0189] In this case, the arrangement of sensors for distinguishing and sensing infrared rays of different wavelength ranges can be configured in various ways, and similarly, the arrangement of filters for transmitting infrared rays of different wavelength ranges can also be configured in various ways, so that by applying various sensors and filters, thermal images for infrared rays can be extracted by wavelength.

[0190] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. A measuring unit including an infrared sensor section that selectively senses infrared rays of different wavelength ranges from infrared rays incident from a target object; and A thermal image colorization system including a calculation unit including a color conversion processing unit that matches colors of each thermal image for infrared rays of different wavelength ranges with respect to the sensed results of the above infrared sensor unit and images infrared rays of different wavelength ranges.

2. In paragraph 1, the color conversion processing unit, Generate infrared thermal images in different wavelength ranges, A thermal image colorization system characterized by matching a predetermined primary color to each thermal image and performing imaging of a target object with the matched color.

3. In the second paragraph, the color conversion processing unit, A thermal imaging colorization system characterized in that, when matching the primary colors, the primary colors are matched so that the color distance of pixels within the entire image or a region of interest within the image is maximized.

4. In the third paragraph, the color conversion processing unit, A thermal imaging colorization system characterized in that, in the sensed results of the above infrared sensor unit, if all three sensed signals are different, the sensed signals are matched to R, G, and B.

5. In the third paragraph, the color conversion processing unit, A thermal imaging colorization system characterized in that, in the sensed results of the above infrared sensor unit, when the difference between two of three sensed signals is relatively large, two of the sensed signals match complementary colors, and the remaining one sensed signal matches black and white colors.

6. In paragraph 1, the infrared sensor part, A sensor unit including a sensor that selectively senses infrared rays of different wavelength ranges; and A thermal imaging colorization system characterized by including a base substrate on which the sensor unit is mounted and a circuit for transmitting a signal sensed by each of the sensors to the color conversion processing unit is formed.

7. In paragraph 6, the sensor, A thermal imaging colorization system characterized in that at least two or more are positioned so as to be spaced apart from each other.

8. In paragraph 6, the sensor, At least two or more are arranged to overlap each other along the incident direction of the infrared ray, A thermal imaging colorization system characterized in that the sensor positioned above along the incident direction of the infrared rays transmits infrared rays in the wavelength range measured by the sensor positioned below.

9. In paragraph 6, the sensor, A thermal imaging colorization system characterized in that the infrared wavelength sensed is variable according to an input signal input from the base substrate.

10. In the first paragraph, the infrared sensor part, A filter that selectively transmits infrared rays of different wavelength ranges; A filter substrate on which the above filter is mounted; A sensor unit including a sensor aligned with the filter and sensing infrared rays of a specific wavelength that have passed through the filter; and A thermal imaging colorization system characterized by including a base substrate on which the sensor unit is mounted and a circuit for transmitting a signal sensed by each of the sensors to the color conversion processing unit is formed.

11. In paragraph 10, The above filters are positioned so that at least two or more are spaced apart from each other, A thermal imaging colorization system, characterized in that the above sensors are provided in at least two units aligned with each of the above mutually spaced filters.

12. In paragraph 10, The above filter has a variable infrared wavelength that it transmits according to an input signal input from the filter substrate. A thermal imaging colorization system, characterized in that the sensor is provided on the sensor unit so as to be aligned with the filter.

13. In paragraph 10, The above filter comprises at least two filters, each having a width equal to the width of the base substrate, A thermal imaging colorization system, characterized in that the filter substrate moves horizontally on the upper portion of the base substrate to change filters overlapping the base substrate.

14. In paragraph 10, the filter, A thermal imaging colorization system characterized by including a plurality of materials having different refractive indices laminated in multiple layers.

15. In paragraph 14, the filter, At least one of germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), barium fluoride (BaF2), magnesium fluoride (MgF2), potassium bromide (KBr), potassium chloride (KCl), sodium chloride (NaCl), and ytterbium fluoride (YbF3) is laminated as a multilayer on a germanium (Ge) substrate, A thermal imaging colorization system, characterized in that the filter substrate comprises at least one of germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), barium fluoride (BaF2), magnesium fluoride (MgF2), potassium bromide (KBr), potassium chloride (KCl), sodium chloride (NaCl), and ytterbium fluoride (YbF3).

16. In the first paragraph, the infrared sensor part, A first filter selectively transmitting infrared rays of different wavelength ranges; A first filter substrate on which the first filter is mounted; A second filter selectively transmitting infrared rays of a wavelength range different from that of the first filter; A second filter substrate disposed below the first filter substrate and having the second filter mounted thereon; A sensor unit including a sensor aligned with the first and second filters and sensing infrared rays of a specific wavelength that have passed through the first and second filters; and A thermal imaging colorization system characterized by including a base substrate on which the sensor unit is mounted and a circuit for transmitting a signal sensed by each of the sensors to the color conversion processing unit is formed.

17. In paragraph 16, The above first filter comprises at least two filters, each having a width equal to the width of the base substrate, The second filter also includes at least two filters, each having a width equal to the width of the base substrate, A thermal imaging colorization system, characterized in that each of the first and second filter substrates moves horizontally on the upper portion of the base substrate to change the filters overlapping the base substrate.

18. In any one of paragraphs 13 and 17, the sensor unit, A thermal imaging colorization system characterized in that a plurality of thermal imaging elements are mounted in a matrix arrangement on the base substrate.

19. A step of selectively sensing infrared rays of different wavelength ranges from infrared rays incident from a target object; A step of generating thermal images for each infrared ray in different wavelength ranges for the sensed infrared ray; A step of matching a predetermined primary color to each thermal image; and A thermal imaging colorization method comprising the step of performing imaging on a target object with the above-mentioned matched primary colors.

20. In the step of matching the primary colors in paragraph 19, A thermal image colorization method characterized by matching the primary colors so that the color distance of pixels within the entire image or a region of interest within the image is maximized.

Images