KR101575937B1 - Apparatus and method for sending/receiving analong thermal image including absolute temperature of reference pixels - Google Patents

Abstract

An apparatus and method for transmitting and receiving an infrared image including an absolute temperature of a reference pixel is disclosed. An analog-to-digital converter for converting a plurality of pixel signals representing amounts of infrared rays respectively detected by infrared detectors of a thermal camera into digital pixel signals; An image processor for determining a temperature distribution of the converted digital pixel signal and resetting a range of values of each digital pixel signal within a range of a maximum temperature and a minimum temperature in each digital infrared image according to the detected temperature distribution; The image processor converts each digital pixel signal of the digital infrared image outputted from the image processor into an analog pixel signal to generate an analog infrared image. The maximum temperature, the minimum temperature, a reference pixel of a predetermined position in each analog infrared image a digital-analog converter for adding the absolute temperature of the pixels to the analog infrared image by a caption function; And an analog transmitter for transmitting the analog infrared image to which the absolute temperature is added.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for transmitting and receiving an infrared image including an absolute temperature of a reference pixel,

The present invention relates to an apparatus and method for transmitting and receiving an infrared image, and more particularly, to an apparatus and method for transmitting and receiving an infrared image including an absolute temperature of a reference pixel.

A thermal imaging camera, also called an infrared camera, is configured to output an image formed by sensing infrared rays.

Thermal cameras are used in various fields. Typical examples are medical / quarantine fields such as remote temperature measurement of immigrants at an airport to detect high-temperature patients, temperature of a transformer installed on a pole, Industrial fields such as long distance measurement to judge overheating, and military / security fields such as detection and detection of enemy or abnormal objects in the dark without light.

The thermal camera adopts various digital communication methods such as LAN, RS232, RS485, firewire, and camera link in order to transmit the temperature of each pixel of the infrared image. There is a disadvantage in that the digital image communication method is difficult to transmit due to a problem such as a large number of cables or noise.

On the contrary, in the case of the analog image communication method, the transmission is easy and the existing communication means can be used as it is, but the original temperature value is lost in the process of converting the digital image into the analog image. Thus, there is a problem that only the image is displayed through the relative temperature difference of each pixel in one infrared image, and the absolute temperature of each pixel can not be known at the receiver.

On the other hand, since the analog image by this relative temperature measurement method is an image to be observed with human eyes, the image is corrected. Linearity is often lost due to nonlinear conversion using gamma correction or the like, and as a result, an absolute value can not be guaranteed.

1 is a graph illustrating a correction concept of an infrared image according to a conventional analog transmission / reception system.

Referring to FIG. 1, the infrared image has a temperature distribution of -20 degrees to 500 degrees, and most of the pixels have a temperature range of 300 degrees to 400 degrees. If the converted analog image is transmitted as it is over the entire temperature range, the entire image is recognized as being divided into a dark portion and a bright portion on the receiving side so that it is difficult to distinguish the object. In such a case, it is easy to distinguish objects by separately digitizing pixels having the highest temperature distribution.

For example, in FIG. 1 (a), if the temperatures of 300 ° C. to 400 ° C. constituting most temperature distributions are digitized to 8 bits, it is configured as shown in FIG. 1 (b). The temperature of 350 degrees will have a value of 128. Such an image makes it much easier to distinguish objects.

However, if such correction is performed on the analog image, only the relative difference in the temperature distribution is shown. Therefore, on the receiving side, it is impossible to extract the temperature value of each pixel.

According to the foregoing, if the temperature distribution of each pixel can be grasped at the receiving side while using the existing analog transmission means, it is possible to display an accurate image of higher quality while transmitting easily.

An object of the present invention is to provide an analog transmitting apparatus for an infrared image including an absolute temperature of a reference pixel.

Another object of the present invention is to provide an analog receiving apparatus for an infrared image including an absolute temperature of a reference pixel.

It is still another object of the present invention to provide an analog transmission method of an infrared image including an absolute temperature of a reference pixel.

It is still another object of the present invention to provide an analog receiving method of an infrared image including an absolute temperature of a reference pixel.

The analog transmitting apparatus of an infrared image including the absolute temperature of the reference pixel according to the object of the present invention may be an analog transmitting apparatus for converting a plurality of pixel signals representing the amount of infrared rays detected by the infrared ray detectors of the thermal imaging camera into digital pixel signals, An analog-to-digital converter; An image processor for determining a temperature distribution of the converted digital pixel signal and resetting a range of values of each digital pixel signal within a range of a maximum temperature and a minimum temperature in each digital infrared image according to the detected temperature distribution; The image processor converts each digital pixel signal of the digital infrared image outputted from the image processor into an analog pixel signal to generate an analog infrared image. The maximum temperature, the minimum temperature, a reference pixel of a predetermined position in each analog infrared image a digital-analog converter for adding the absolute temperature of the pixels to the analog infrared image by a caption function; And an analog transmitter for transmitting the analog infrared image to which the absolute temperature is added.

At this time, the image processor may be configured to set the temperatures of 95% and 5% of the total temperature distribution to the maximum temperature and the minimum temperature, respectively, in the digital infrared image converted by the analog-digital converter.

According to another aspect of the present invention, there is provided an analog receiving apparatus for an infrared image including an absolute temperature of a reference pixel. The analog receiving apparatus includes a temperature sensor for detecting an absolute temperature of reference pixels at a predetermined temperature, An analog receiver for receiving the analog infrared image added by the analog infrared image; An analog-to-digital converter for converting each analog pixel signal of the received analog infrared image into a digital pixel signal to generate a digital infrared image; An image analyzer for calculating a temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of reference pixels at a predetermined position, and reconstructing each digital pixel signal; And a display for outputting a digital infrared image constituted by the reconstructed digital pixel signal in the image interpreter.

Here, the image interpreter may calculate an average of the error between the value of the digital pixel signal of the reference pixel generated by the analog-to-digital converter and the absolute temperature of the reference pixel, and outputs the value of the digital pixel signal to the calculated error And calculating the absolute temperature corresponding to the subtracted value and reconstructing the digital pixel signal in the corresponding digital infrared image using the calculated absolute temperature. have.

According to another aspect of the present invention, there is provided an analog transmission method of an infrared image including an absolute temperature of a reference pixel, wherein an analog-digital converter converts the amount of infrared rays detected by the infrared Converting a plurality of pixel signals representing a plurality of pixel signals into digital pixel signals; The image processor grasps the temperature distribution of the converted digital pixel signals and resets and outputs a range of values of the digital pixel signals within the range of the maximum temperature and the minimum temperature in each digital infrared image according to the detected temperature distribution step; A digital-analog converter converts each digital pixel signal of the output digital infrared image into an analog pixel signal to generate an analog infrared image; Adding the absolute temperature of the reference pixels of the predetermined position in the analog infrared image by the caption function to the maximum temperature and the minimum temperature of the digital-analog converter; And an analog transmitter transmits the analog infrared image to which the absolute temperature is added.

At this time, the image processor grasps the temperature distribution of the converted digital pixel signals, resets the range of values of the digital pixel signals within the range of the maximum temperature and the minimum temperature in each digital infrared image according to the detected temperature distribution The digital infrared image converted by the analog-to-digital converter may be configured to set the temperatures of 95% and 5% of the total temperature distribution as the maximum temperature and the minimum temperature, respectively.

According to another aspect of the present invention, there is provided an analog receiving method of an infrared image including an absolute temperature of a reference pixel, wherein an absolute temperature of a reference pixel at a predetermined position, receiving an analog infrared image added by a caption function; Converting an analog pixel signal of the received analog infrared image into a digital pixel signal by an analog-digital converter (analog-digital converter) to generate a digital infrared image; Calculating a temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of reference pixels at a predetermined position, and reconstructing each digital pixel signal; And outputting a digital infrared image in which the display is composed of the reconstructed digital pixel signals in the image interpreter.

At this time, the image analyzer computes the temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of the reference pixels of the predetermined position to reconstruct each digital pixel signal Calculating an average of errors between a value of a digital pixel signal of a reference pixel generated by the analog-digital converter and an absolute temperature of the reference pixel, and subtracting the value of the digital pixel signal from an average of the calculated error And then reconstructs the digital pixel signal in the corresponding digital infrared image using the calculated absolute temperature.

According to the apparatus and method for transmitting and receiving an infrared image including the absolute temperature of the reference pixel as described above, the absolute temperature of the reference pixel is added to the analog infrared image using the caption function, The absolute temperature of each pixel can be accurately restored on the receiving side. Unlike the conventional analog image, the absolute temperature of each pixel can be restored and an accurate image can be displayed.

1 is a graph illustrating a correction concept of an infrared image according to a conventional analog transmission / reception system.
2 is a block diagram of an analog transmitting apparatus for an infrared image including an absolute temperature of a reference pixel according to an embodiment of the present invention.
3 is an exemplary diagram illustrating reference pixels of an infrared image according to an exemplary embodiment of the present invention.
4 is an exemplary view of an infrared image to which a caption is added according to an embodiment of the present invention.
5 is a block diagram of an analog receiving apparatus of an infrared image including an absolute temperature of a reference pixel according to an embodiment of the present invention.
6 is a flowchart of an analog transmission method of an infrared image including an absolute temperature of a reference pixel according to an exemplary embodiment of the present invention.
7 is a flowchart of an analog receiving method of an infrared image including an absolute temperature of a reference pixel according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, 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 belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an analog transmitting apparatus for an infrared image including an absolute temperature of a reference pixel according to an embodiment of the present invention.

2, an analog transmitting apparatus 100 for an infrared image including an absolute temperature of a reference pixel according to an exemplary embodiment of the present invention includes an analog-to-digital converter 110, an image processor 120 ), A digital-analog converter (130), and an analog transmitter (140).

Hereinafter, the detailed configuration will be described.

An analog-to-digital converter (110) is configured to convert a plurality of pixel signals representative of the amount of infrared detected respectively in the infrared detector (102) of the thermal imaging camera into digital pixel signals.

Here, the infrared ray detector 102 is an infrared ray sensor provided for each pixel, and is configured to detect the infrared rays received through the lens 101 of the thermal image camera.

The analog-to-digital converter 110 converts an analog pixel signal according to the amount of detected infrared rays into a digital pixel signal.

The image processor 120 is configured to determine the temperature distribution of the converted digital pixel signal in the analog-digital converter 110. Here, the range of the values of the respective digital pixel signals is reset within the range of the maximum temperature and the minimum temperature in each digital infrared image according to the detected temperature distribution, and is output.

At this time, the image processor 120 preferably sets the temperatures of 95% and 5% of the total temperature distribution in the digital infrared image converted by the analog-digital converter 110 to the maximum temperature and the minimum temperature, respectively. For example, a temperature distribution value of 128 bits can be reset for pixels within the temperature range of 95% to 5%.

The digital-analog converter is configured to convert each digital pixel signal of the digital infrared image output from the image processor 120 into an analog pixel signal to generate an analog infrared image.

At this time, the digital-to-analog converter 130 converts the absolute temperature of the reference pixels of the predetermined position within the respective analog infrared images into the corresponding analog infrared image by the caption function, . The reference pixel will be described with reference to FIG.

3 is an exemplary diagram illustrating reference pixels of an infrared image according to an exemplary embodiment of the present invention.

As shown in Fig. 3, the reference pixel is a pixel at a plurality of predetermined positions. The digital-to-analog converter 130 adds the absolute temperature only to the corresponding pixel to the infrared analog image by the caption function.

The absolute temperature of the reference pixel is used as a configuration for restoring the absolute temperature of all the pixels of the infrared image at the receiving side.

Caption is a standardized method for encoding characters into NTSC TV signals.

Characters can be displayed on a TV via an internal or external decoder, and the caption can be used not only on DVDs, but also on video tapes, TV broadcasts, and cable TV.

Referring again to FIG. 2, the ODD / EVEN discriminator 133 is configured to judge odd and even pages of the image, determines the number of lines in the V counter 132, Pixel. The register 134 receives and stores the absolute temperature of the reference pixel from the image processor 120 and the caption controller 135 is configured to add it to the analog infrared image of the digital-to-analog converter 130.

For example, when the maximum temperature is 400 degrees, the minimum temperature is 300 degrees, and the temperature of any one reference pixel is 330 degrees in an infrared image, the reference pixel values are converted into analog infrared images, The maximum number of bits is converted to 76.8 by 256: 76.8.

When the temperature of the other reference pixel is 350 degrees, the value of the reference pixel when converted into the analog infrared image is converted to 128 by the maximum number of bits of 256: 128 in the temperature interval of 100 degrees: 50 degrees, respectively.

The thus changed value is added by the caption and transmitted.

On the other hand, an analog infrared image with caption added is illustrated in FIG.

4 is an exemplary view of an infrared image to which a caption is added according to an embodiment of the present invention.

As shown in FIG. 4, it can be seen that image data, each reference pixel, the temperature value of the set point, and the like are stored and transmitted to each line of the image according to a pre-designated manner.

Referring again to FIG. 2, the analog transmitter 140 is configured to transmit an analog infrared image with an added absolute temperature.

5 is a block diagram of an analog receiving apparatus of an infrared image including an absolute temperature of a reference pixel according to an embodiment of the present invention.

Referring to FIG. 5, an infrared receiver analogue receiver 200 including an absolute temperature of a reference pixel according to an embodiment of the present invention includes an analog receiver 210, an analog-to-digital converter 220 ), An image analyzer 230, and a display 240.

Hereinafter, the detailed configuration will be described.

The analog receiver 210 is configured to receive the analog infrared image added by the caption function with the maximum temperature, the minimum temperature, and the absolute temperature of the reference pixels of the predetermined position. For the information added to the caption function, see the description of FIG.

The analog-to-digital converter 220 is configured to convert each analog pixel signal of the analog infrared image received at the analog receiver 210 into a digital pixel signal to generate a digital infrared image.

This is to restore the absolute temperature of each pixel by converting the infrared image into digital.

The image analyzer 230 calculates the temperature of the digital pixel signal in the digital infrared image generated using the maximum temperature, the minimum temperature, and the absolute temperature of the reference pixels of the predetermined position to reconstruct each digital pixel signal .

More specifically, it is as follows.

The image interpreter 230 is configured to calculate an average of the error between the value of the digital pixel signal of the reference pixel generated in the analog-digital converter 220 and the absolute temperature of the reference pixels. The image analyzer 230 is configured to subtract the value of the digital pixel signal from the average of the previously calculated errors and to calculate an absolute temperature corresponding to the subtracted value. At this time, the entire digital pixel signal is reconstructed into a signal having a proportional absolute temperature by using the calculated absolute temperature.

For example, in the example of FIG. 2, if the reference pixel value is 90 or 140, the average of the error of the reference pixel is calculated by {(90-76.8} + (140-128)) / 2 . Assuming that the average of the error of each reference pixel is 15 by more reference pixels, if the value of the pixel to be known is 200, the pixel becomes 185 in brightness by 200-15. The temperature is calculated in proportion to the temperature range of 300 ° C. to 400 ° C., which is calculated as 72.27, and the minimum temperature 300 is added to become 372.27 °.

The H counter 231, the V counter 232, and the ODD / EVEN discriminator 233 can be utilized as shown in FIG. 2 to designate the position of the pixel. The register 234 receives and stores the temperature value of the reference pixel, and the stored temperature is used for image restoration of the image analyzer 230.

The display 240 is configured to output a digital infrared image composed of the reconstructed digital pixel signals in the image interpreter 230.

6 is a flowchart of an analog transmission method of an infrared image including an absolute temperature of a reference pixel according to an exemplary embodiment of the present invention.

Referring to FIG. 6, an analog-to-digital converter 110 converts a plurality of pixel signals representing amounts of infrared rays respectively detected by an infrared ray detector 102 of a thermal camera into digital pixel signals (S101 ).

Next, the image processor 120 grasps the temperature distribution of the converted digital pixel signal, and determines the value of each digital pixel signal within the range of the maximum temperature and the minimum temperature in each digital infrared image according to the detected temperature distribution The range is reset and output (S102).

At this time, the image processor 120 may be configured to set the temperatures of 95% and 5% of the total temperature distribution in the digital infrared image converted by the analog-digital converter 110 to the maximum temperature and the minimum temperature, respectively.

Next, a digital-analog converter 130 converts each of the digital pixel signals of the digital infrared image outputted earlier to an analog pixel signal to generate an analog infrared image (S103).

Next, the digital-to-analog converter 130 converts the absolute temperature of the reference pixels of the predetermined position within the respective analog infrared images into the corresponding analog infrared image by the caption function (S104).

Next, the analog transmitter 140 transmits the analog infrared image to which the absolute temperature is added (S105).

7 is a flowchart of an analog receiving method of an infrared image including an absolute temperature of a reference pixel according to an embodiment of the present invention.

Referring to FIG. 7, the analog receiver 210 receives an analog infrared image added with a maximum temperature, a minimum temperature, and an absolute temperature of reference pixels at a predetermined position by a caption function (S201 ).

Next, an analog-to-digital converter (ANG) 220 converts each analog pixel signal of the previously received analog infrared image into a digital pixel signal to generate a digital infrared image (S202).

Next, the image analyzer 230 calculates the temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of reference pixels at predetermined positions, (S203).

At this time, the image analyzer 230 calculates an average of the error between the value of the digital pixel signal of the reference pixel generated by the analog-digital converter 220 and the absolute temperature of the reference pixels. The value of the digital pixel signal is subtracted from the average of the previously calculated errors, and the absolute temperature corresponding to the subtracted value is calculated. Using the calculated absolute temperature, all the digital pixel signals in the corresponding digital infrared image are reconstructed in proportion to the temperature. Therefore, unlike the conventional analog infrared image, the temperature of all pixels can be grasped and reconstructed according to the temperature.

Next, the display 240 outputs a digital infrared image composed of the reconstructed digital pixel signals in the image analyzer 230 (S204).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

101: Lens
102: Infrared detector
110: Analog-to-digital converter
120: image processor
130: Digital-to-Analog Converter
131: H counter
132: V counter
133: ODD / EVEN discriminator
134: Register
135: Caption controller
140: Analog transmitter
10: Analog receiver
220: Analog-to-digital converter
30: Image interpreter
231: H counter
232: V counter
233: ODD / EVEN discriminator
234: Register
240: Display

Claims (8)

An analog transmission apparatus of an infrared image including an absolute temperature of a reference pixel,
An analog-to-digital converter for converting a plurality of pixel signals representing amounts of infrared rays respectively detected by infrared detectors of a thermal camera into digital pixel signals;
An image processor for determining a temperature distribution of the converted digital pixel signal and resetting a range of values of each digital pixel signal within a range of a maximum temperature and a minimum temperature in each digital infrared image according to the detected temperature distribution;
The image processor converts each digital pixel signal of the digital infrared image outputted from the image processor into an analog pixel signal to generate an analog infrared image. The maximum temperature, the minimum temperature, a reference pixel of a predetermined position in each analog infrared image a digital-analog converter for adding the absolute temperature of the pixels to the analog infrared image by a caption function; And
And an analog transmitter for transmitting the analog infrared image to which the absolute temperature is added. The image processing apparatus according to claim 1,
Wherein a temperature of 95% and a temperature of 5% of the entire temperature distribution are set to the maximum temperature and the minimum temperature in the digital infrared image converted by the analog-digital converter, Device. An analog receiving apparatus of an infrared image including an absolute temperature of a reference pixel,
An analog receiver for receiving an analog infrared image added with a maximum temperature, a minimum temperature, and an absolute temperature of reference pixels of a predetermined position by a caption function;
An analog-to-digital converter for converting each analog pixel signal of the received analog infrared image into a digital pixel signal to generate a digital infrared image;
An image analyzer for calculating a temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of reference pixels at a predetermined position, and reconstructing each digital pixel signal; And
And a display for outputting a digital infrared image composed of the reconstructed digital pixel signals in the image analyzer. The image processing apparatus according to claim 3,
An average of errors between a value of a digital pixel signal of a reference pixel generated by the analog-to-digital converter and an absolute temperature of the reference pixel is calculated, and a value of the digital pixel signal is subtracted from an average of the calculated error, And reconstructs the digital pixel signal in the corresponding digital infrared image using the calculated absolute temperature. The apparatus of claim 1, wherein the absolute temperature of the reference pixel is less than the absolute temperature of the reference pixel. Converting an analog-to-digital converter (ADC) to a digital pixel signal, the plurality of pixel signals representing the amount of infrared light detected by the infrared detector of the thermal camera, respectively;
The image processor grasps the temperature distribution of the converted digital pixel signals and resets and outputs a range of values of the digital pixel signals within the range of the maximum temperature and the minimum temperature in each digital infrared image according to the detected temperature distribution step;
A digital-analog converter converts each digital pixel signal of the output digital infrared image into an analog pixel signal to generate an analog infrared image;
Adding the absolute temperature of the reference pixels of the predetermined position in the analog infrared image by the caption function to the maximum temperature and the minimum temperature of the digital-analog converter;
And an analog transmitter transmitting the analog infrared image to which the absolute temperature is added. The image processing method according to claim 5, wherein the image processor grasps a temperature distribution of the converted digital pixel signals, and calculates a value of each digital pixel signal within a range of a maximum temperature and a minimum temperature in each digital infrared image, And the step of outputting,
Wherein a temperature of 95% and a temperature of 5% of the entire temperature distribution are set to the maximum temperature and the minimum temperature in the digital infrared image converted by the analog-digital converter, Way. Receiving an analog infrared image in which an analog receiver has added a maximum temperature, a minimum temperature, and an absolute temperature of reference pixels at a predetermined position by a caption function;
Converting an analog pixel signal of the received analog infrared image into a digital pixel signal by an analog-digital converter (analog-digital converter) to generate a digital infrared image;
Calculating a temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of reference pixels at a predetermined position, and reconstructing each digital pixel signal;
And outputting a digital infrared image in which the display is composed of digital pixel signals reconstructed in the image interpreter. The image analyzer according to claim 7, wherein the image analyzer calculates the temperature of the digital pixel signal in the generated digital infrared image using the maximum temperature, the minimum temperature, and the absolute temperature of reference pixels at a predetermined position, The step of reconstructing the pixel signal comprises:
An average of errors between a value of a digital pixel signal of a reference pixel generated by the analog-to-digital converter and an absolute temperature of the reference pixel is calculated, and a value of the digital pixel signal is subtracted from an average of the calculated error, And reconstructs a digital pixel signal in the digital infrared image using the calculated absolute temperature. The method of claim 1, wherein the absolute temperature of the reference pixel is determined based on the absolute temperature of the reference pixel.

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