Spectroscopic imaging method, spectroscopic imaging device, and computer program

Abstract

To provide a spectroscopic imaging method, a spectroscopic imaging apparatus, and a computer program capable of performing simple spectroscopic imaging.SOLUTION: A spectroscopic imaging method includes the steps of: setting a wavelength for spectroscopic imaging an object; installing the object and a white reference in an imaging region in which the object is imaged; identifying a position of the white reference to set the position of the white reference as a reference area; preliminary imaging the reference area with predetermined exposure time for each of a plurality of wavelengths to acquire an intensity value for each wavelength; calculating exposure time at actual imaging on the basis of a maximum intensity value obtained by preliminary imaging and a target intensity value at the actual imaging; actual imaging the object with the exposure time at the actual imaging; generating a processed image on the basis of an intensity spectrum of all pixels of a captured image of the object with respect to an intensity spectrum of the reference area; and displaying the processed image.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a spectroscopic imaging method, a spectroscopic imaging device, and a computer program. [Background technology]

[0002] Patent Document 1 discloses the configuration of a spectroscopic camera equipped with a wavelength-tunable optical filter and functioning as a spectroscopic imaging device. A spectroscopic imaging method using the spectroscopic imaging device can obtain a spectroscopic spectrum by, for example, performing calibration using a white tile and then capturing images of all wavelengths for a predetermined exposure time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-45599 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when capturing images over a relatively wide field of view, it is difficult to place white tiles in the same position as the object across the wide field of view. Furthermore, to obtain the optimal spectral spectrum, or captured image, repeated trial and error is required while changing the exposure time, or all wavelengths are captured with a fixed exposure time, resulting in poor image quality and a long capture time. Therefore, a simple and fast spectral capture method is needed. [Means for solving the problem]

[0005] The spectroscopic photography method includes the steps of: setting a wavelength for spectroscopic photography of an object; placing the object and a white reference within a photography area where the object will be photographed; identifying the position of the white reference and setting it as a reference area; taking preliminary photographs of the reference area for each of a plurality of wavelengths at a predetermined exposure time and obtaining intensity values ​​for each wavelength; calculating an exposure time for actual photography based on the maximum intensity value obtained in the preliminary photographs and a target intensity value for actual photography; photographing the object using the exposure time for actual photography; generating a processed image based on the intensity spectrum of all pixels of the photographed image of the object relative to the intensity spectrum of the reference area; and displaying the processed image.

[0006] The spectroscopic photography device includes a spectral filter, an optical sensor that receives light transmitted through the spectral filter, and a control unit that controls the transmission wavelength of the spectral filter, and the control unit performs processing including setting a wavelength for spectroscopic photography of an object, placing the object and a white reference within a photography area where the object will be photographed, identifying the position of the white reference and setting it as a reference area, taking preliminary photographs of the reference area for each of a plurality of wavelengths at a predetermined exposure time and obtaining intensity values ​​for each wavelength, calculating the exposure time for actual photography based on the maximum intensity value obtained in the preliminary photographs and a target intensity value for actual photography, photographing the object using the exposure time for actual photography, generating a processed image based on the intensity spectrum of all pixels of the photographed image of the object relative to the intensity spectrum of the reference area, and displaying the processed image.

[0007] The computer program is a computer program for generating a processed image, and includes the steps of setting wavelengths for spectroscopic photography of an object, placing the object and a white reference within a photography area in which the object will be photographed, identifying the position of the white reference and setting it as a reference area, taking preliminary photographs of the reference area for each of a plurality of wavelengths at a predetermined exposure time and obtaining intensity values ​​for each wavelength, calculating the exposure time for actual photography based on the maximum intensity value obtained in the preliminary photography and a target intensity value for actual photography, photographing the object using the exposure time for actual photography, generating a processed image based on the intensity spectrum of all pixels of the photographed image of the object relative to the intensity spectrum of the reference area, displaying the processed image, and storing the processed image in a memory unit. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a spectroscopic imaging device. [Figure 2] 1 is a flowchart showing a spectroscopic imaging method. [Figure 3] FIG. 2 is a schematic diagram showing the configuration of a display unit. [Figure 4] 1 is a graph illustrating a part of a spectroscopic imaging method. [Figure 5] FIG. 2 is a diagram illustrating a part of a spectroscopic imaging method. [Figure 6] FIG. 2 is a diagram illustrating a part of a spectroscopic imaging method. [Figure 7] FIG. 2 is a diagram illustrating a part of a spectroscopic imaging method. [Figure 8] FIG. 2 is a diagram illustrating a part of a spectroscopic imaging method. [Figure 9] FIG. 2 is a diagram illustrating a part of a spectroscopic imaging method. DETAILED DESCRIPTION OF THE INVENTION

[0009] The configuration of the spectroscopic imaging device 100 will be described with reference to FIG.

[0010] 1, the spectroscopic imaging device 100 is capable of, for example, capturing an image of an object P for each wavelength and obtaining a spectroscopic spectrum from the captured image. The spectroscopic imaging device 100 includes, for example, an imaging unit 10, a processing unit 20, and a display unit 30.

[0011] The photographing unit 10 includes an incident optical system 40 into which light from the object P is incident, a bandpass filter (BPF) 50, a spectral filter 60 that spectrally separates the incident light, and an optical sensor 70 that photographs the light spectrally separated by the spectral filter 60.

[0012] The incident optical system 40 includes, for example, an autofocus mechanism. The incident optical system 40 is also configured, for example, by a telecentric optical system, and guides the light 41 of the first wavelength number to the spectral filter 60 so that the optical axis and the chief ray are parallel or approximately parallel to each other.

[0013] The spectral filter 60 is, for example, a wavelength selection filter, and a Fabry-Perot type filter capable of changing the transmission wavelength band is used.

[0014] The spectral filter 60 is a wavelength-tunable interference filter including a pair of substrates 61, 62, a pair of reflective films 63, 64 facing each other, and a gap changer 65 that can change the gap dimension between these reflective films 63, 64. The gap changer 65 is configured by, for example, an electrostatic actuator. The wavelength-tunable interference filter is also called an etalon. The spectral filter 60 is disposed on the optical path of light incident on the optical sensor 70.

[0015] The spectral filter 60 changes the gap dimension of the reflective films 63 and 64 by changing the voltage applied to the gap change unit 65 under the control of the control unit 21 that constitutes the processing unit 20, and changes the output wavelength λi (i=1, 2,..., N), which is the wavelength of the light that passes through the reflective films 63 and 64.

[0016] The optical sensor 70 is, for example, a CCD (Charge Coupled Device), and is an imaging device that obtains an electrical signal representing the object P by photoelectrically converting the light 42 of the second wavelength that has passed through the spectral filter 60.

[0017] The spectroscopic imaging device 100 sequentially receives instructions for a plurality of measurement bands (multi-bands) from the control unit 21 at the spectroscopic filter 60, thereby sequentially changing the transmission wavelength range of the spectroscopic filter 60. In this way, the spectroscopic imaging device 100 captures images of the object P with sensitivities in a plurality of wavelength bands.

[0018] The processing unit 20 has a control unit 21, a storage unit 22, an arithmetic processing unit 23, an imaging wavelength setting unit 24, a reference area setting unit 25, an exposure time setting unit 26, a number of images to be captured setting unit 27, and an image generation unit 28. The processing unit 20 also performs various processes by executing a control program as a computer program.

[0019] The control unit 21 is configured to include one or more processors, and performs overall control of the operation of the spectroscopic imaging device 100 by operating according to a control program stored in the storage unit 22, for example.

[0020] The storage unit 22 is configured with memories such as RAM (Random Access Memory) and ROM (Read Only Memory). The RAM is used for temporary storage of various data, and the ROM stores control programs and control data for controlling the operation of the spectroscopic imaging device 100. The storage unit 22 also stores images captured by the optical sensor 70 for each transmitted wavelength, as well as processed images.

[0021] The arithmetic processing unit 23 executes various processes using the data and parameters stored in the storage unit 22. The arithmetic processing unit 23 also executes various arithmetic processes based on information about the captured image.

[0022] The imaging wavelength setting unit 24 sets an imaging wavelength that allows an optimal image to be acquired based on the object P selected by the user. Specifically, for example, when imaging NDVI (Normalized Difference Vegetation Index: an index that indicates the distribution and activity of vegetation), wavelengths of 680 nm and 800 nm are set. Also, for example, when imaging moisture, a wavelength of around 970 nm is set. In this way, the imaging wavelength setting unit 24 reads out and sets the optimal wavelength according to the object P to be imaged from the storage unit 22. Also, when imaging the entire wavelength range, the imaging wavelength setting unit 24 sets a wavelength of, for example, 620 nm to 1100 nm.

[0023] The reference area setting unit 25 sets all or part of a white reference 32 (see FIG. 3), such as a white tile, specified by the user as the reference area 33. Specifically, a white tile of, for example, about 20 cm × 20 cm is placed in the shooting area 31 (see FIG. 3) to be photographed, and a part or area of ​​the white tile is determined, thereby setting that part as the white reference 32 or the reference area 33.

[0024] The exposure time setting unit 26 sets the exposure time for each wavelength to be photographed in accordance with the object P. Specifically, the calculation processing unit 23 calculates the exposure time for the actual photographing based on the maximum intensity value obtained in the preliminary photographing and the target intensity value for the actual photographing, and the exposure time setting unit 26 sets the calculated value as the exposure time.

[0025] The number-of-photographs setting unit 27 sets the number of photographic frames to be photographed for each wavelength during actual photographing, i.e., the number of photographs to be taken. Specifically, the number-of-photographs setting unit 27 fixes the exposure time for each wavelength and increases the number of photographic frames for each wavelength to generate an optimal frame number table.

[0026] The image generation unit 28 generates a processed image from the captured image captured under the above conditions. Specifically, the processed image is generated based on the intensity spectrum of all pixels of the captured image of the object P relative to the intensity spectrum of the reference area 33.

[0027] The display unit 30 is, for example, a liquid crystal display or an organic EL display, and has both a display function and an input function. The display unit 30 displays an image of the object P to be photographed, a white tile, etc., as well as a processed image.

[0028] The input function is configured, for example, with a touch panel provided on the surface of the display unit 30. Note that the input is not limited to the touch panel, and input may also be made using a mouse, direction keys, numeric keys, or the like.

[0029] Next, a spectroscopic imaging method using the spectroscopic imaging device 100 of this embodiment will be described with reference to Figures 2 to 9. Note that steps S11 to S14 are preparation steps for performing preliminary imaging, and steps S15 to S17 are actual steps for performing actual imaging.

[0030] As shown in FIG. 2, in step S11, the imaging wavelength setting unit 24 sets the imaging wavelength for the object P. Specifically, as shown in FIG. 3, the user selects the type of object P on the display unit 30. Here, moisture (970 nm) is selected as a pre-registered detection item. By selecting the item, the wavelength for imaging is automatically set.

[0031] In this embodiment, by selecting an item, the process can be automatically performed from preliminary imaging to actual imaging. As shown in Fig. 3, the user may input the wavelength to be imaged, or the exposure time for imaging. If the user wishes to image the entire wavelength range, 620nm to 1100nm may be selected.

[0032] In step S12, the reference area setting unit 25 sets the reference area 33. First, as shown in FIG. 3, the user places the object P to be photographed and the white reference 32 within the photographing area 31 to be photographed. Next, for example, the user touches the white reference 32 displayed on the touch panel to specify the white reference 32. Note that the white reference 32 may be specified by operating the mouse, or the reference area 33 may be enclosed by operating the mouse.

[0033] In step S13, the image capturing unit 10 performs preliminary image capturing. Specifically, when the user touches the image capturing start button 34 on the display unit 30, the image capturing unit 10 performs preliminary image capturing at a wavelength set with a short fixed exposure time so as not to cause intensity saturation, specifically so as not to cause overexposure due to excessive brightness, and acquires the intensity of the reference area 33.

[0034] In step S14, the exposure time setting unit 26 sets the exposure time for the actual imaging so that the wavelength with the maximum intensity obtained in the preliminary imaging is the targeted intensity value. Specifically, as shown in Fig. 4, the exposure time setting unit 26 causes the calculation processing unit 23 to calculate the exposure time for the actual imaging based on the maximum intensity value (S0max) obtained in the preliminary imaging and the targeted intensity value (S1) for the actual imaging. In other words, the exposure time is set so that a bright image is obtained at all wavelengths.

[0035] For example, when the exposure time is constant and the number of images taken for each wavelength is changed, the exposure time and number of images taken can be calculated using the following formulas (1) and (2). The exposure time for the actual shooting is exp1. The exposure time for the preliminary shooting is exp0. The target intensity value is S1. The maximum intensity value for the preliminary shooting is S0max. Furthermore, the number of images taken for the actual shooting is n(λ). The intensity value for each wavelength in the preliminary shooting is S0(λ).

[0036]

number

[0037]

number

[0038] In other words, the method for calculating the exposure time for the actual shooting is to set the target intensity value for the wavelength at which the intensity value is maximum in the preliminary shooting of the reference area 33 based on (exposure time for the preliminary shooting) x (target intensity value for the actual shooting / maximum intensity value for the preliminary shooting).

[0039] For other wavelengths, the intensity value will be smaller for the same exposure time, so an optimal frame number table is automatically generated by increasing the number of images taken for each wavelength (number of frames acquired), assuming the exposure time for actual shooting.

[0040] Furthermore, for example, when the number of images taken is one for each wavelength and the exposure time is changed for each wavelength, the exposure time and the number of images taken can be calculated using the following equations (3) and (4). Note that the exposure time for actual shooting is exp1(λ).

[0041]

number

[0042]

number

[0043] In other words, the method for calculating the exposure time for the actual shooting is to set it based on (exposure time for preliminary shooting) x (target intensity value for actual shooting / maximum intensity value for preliminary shooting) so that the targeted intensity value is achieved for each wavelength captured in the preliminary shooting.

[0044] In this way, the exposure time setting unit 26 sets, based on the spectral data such as that shown in Fig. 4, what exposure time should be used in the actual shooting, whether to increase the number of shots to be taken and average them out because the wavelength λ is dark, etc. The exposure time setting unit 26 also sets the exposure time in the actual shooting so as not to saturate the intensity of the reference area 33. In this way, once the preliminary shooting is completed by step S14, the process moves to step S15 to start the actual shooting.

[0045] In step S15, the photographing unit 10 performs actual photographing. Specifically, the control unit 21 causes the optical sensor 70 to photograph the object P for each wavelength using the exposure time set in the above process. This allows the processing unit 20 to obtain the reflectance spectrum of each pixel.

[0046] In step S16, the image generation unit 28 causes the calculation processing unit 23 to generate an image. Specifically, a processed image is generated based on the intensity spectrum of all pixels of the captured image of the object P relative to the intensity spectrum of the reference area 33.

[0047] In step S17, the processed image is displayed. Here, an example will be described in which image processing is performed on water 202 contained in an object 201 such as a shishito pepper by second-order differentiation, as shown in Figs. 5 to 9. Fig. 5 shows a sample image displayed in the photographing area 31 to be photographed. Second-order differentiation is a process that is generally performed to make it easier to detect the peak wavelength of light absorption by a substance. In the case of second-order differentiation, photographs are taken at a minimum of three wavelengths (see Figs. 6, 7, and 8).

[0048] As described above, actual shooting is performed based on the set exposure time and frame table, multiple frames from the captured images are averaged, and then a second-order differential image is generated and displayed. If the three wavelengths are λ0, λ1, and λ2 in ascending order, the second-order differential image at λ1 can be calculated by adding the λ0 (920 nm) image to the λ2 (1020 nm) image - 2 × the λ1 (970 nm) image.

[0049] The NDVI image can be calculated by (800 nm image - 680 nm image) / (800 nm image + 680 nm image).

[0050] As a result, the moisture 202 contained in the object 201 can be detected, and a processed image representing the moisture 202, that is, a characteristic portion corresponding to the substance, can be displayed on the display unit 30.

[0051] As described above, the spectroscopic photography method of this embodiment includes the steps of setting the wavelength for spectroscopic photography of the object P, placing the object P and the white reference 32 within the photography area 31 where the object P will be photographed, identifying the position of the white reference 32 and setting it as the reference area 33, taking preliminary photographs of the reference area 33 for each of a plurality of wavelengths at a predetermined exposure time and obtaining intensity values ​​for each wavelength, calculating the exposure time for the actual photography based on the maximum intensity value S0max obtained in the preliminary photography and the target intensity value S1 for the actual photography, photographing the object P using the exposure time for the actual photography, generating a processed image based on the intensity spectrum of all pixels of the photographed image of the object P relative to the intensity spectrum of the reference area 33, and displaying the processed image.

[0052] According to this method, by specifying the white reference 32 and setting the reference area 33 before the actual shooting, calibration is possible even when the white reference 32 is difficult to recognize, such as when shooting with a wide field of view. Furthermore, since the exposure time for the actual shooting is calculated based on the preliminary shooting, the object P can be shot under optimal shooting conditions (e.g., shooting wavelength, exposure time for each wavelength, etc.) in the actual shooting. Therefore, compared to repeated trial and error or shooting all wavelengths with a fixed exposure time, shooting can be done easily and quickly. In addition, high-quality processed images can be obtained.

[0053] Furthermore, in the spectroscopic imaging method of this embodiment, the step of calculating the exposure time for actual imaging preferably sets the wavelength at which the intensity value is maximum in preliminary imaging of the reference area 33 based on (exposure time for preliminary imaging) x (target intensity value for actual imaging / maximum intensity value in preliminary imaging) so as to achieve the targeted intensity value, and for the other wavelengths, generates an optimal frame number table in which the number of imaging frames is increased for each wavelength based on the exposure time for actual imaging. According to this method, the exposure time for actual imaging is calculated from the preliminary imaging based on the above formula, so that the object P can be imaged under optimal imaging conditions in the actual imaging. Specifically, the exposure time for each wavelength is fixed, and the number of imaging frames for each wavelength is changed.

[0054] Furthermore, in the spectroscopic imaging method of this embodiment, the step of calculating the exposure time for actual imaging is preferably set based on (exposure time for preliminary imaging) x (target intensity value for actual imaging / maximum intensity value for preliminary imaging) so that the targeted intensity value is achieved for each wavelength captured in the preliminary imaging. According to this method, the exposure time for actual imaging is calculated from the preliminary imaging based on the above formula, so that the object P can be captured under optimal imaging conditions in the actual imaging. Specifically, the number of imaging frames for each wavelength is one, and the exposure time for each wavelength is changed.

[0055] Furthermore, the spectroscopic imaging device 100 of this embodiment is a spectroscopic imaging device 100 equipped with a spectral filter 60, an optical sensor 70 that receives light transmitted through the spectral filter 60, and a control unit 21 that controls the transmission wavelength of the spectral filter 60, and the control unit 21 performs processing including setting the wavelength for spectroscopic imaging of the object P, placing the object P and a white reference 32 within an imaging area 31 where the object P will be imaged, identifying the position of the white reference 32 and setting it as a reference area 33, performing preliminary imaging of the reference area 33 for each of a plurality of wavelengths at a predetermined exposure time to obtain intensity values ​​for each wavelength, calculating the exposure time for the actual imaging based on the maximum intensity value obtained in the preliminary imaging and the target intensity value for the actual imaging, performing actual imaging of the object P using the exposure time for the actual imaging, generating a processed image based on the intensity spectrum of all pixels of the image of the object P relative to the intensity spectrum of the reference area 33, and displaying the processed image.

[0056] According to this configuration, by specifying the white reference 32 and setting the reference area 33 before the actual shooting, calibration is possible even in cases where it is difficult to place white tiles in the same positions as the object across a wide field of view, such as when shooting with a wide field of view. Furthermore, since the exposure time for the actual shooting is calculated based on the preliminary shooting, the object P can be shot under optimal shooting conditions (e.g., shooting wavelength, exposure time for each wavelength, etc.) in the actual shooting. Therefore, compared to repeated trial and error or shooting all wavelengths with a fixed exposure time, shooting can be done easily and quickly. In addition, high-quality processed images can be obtained.

[0057] In addition, the computer program of this embodiment is a computer program for generating a processed image, and includes the steps of setting a wavelength for spectroscopic photography of the object P, placing the object P and a white reference 32 within the photography area 31 where the object P will be photographed, identifying the position of the white reference 32 and setting it as the reference area 33, taking preliminary photographs of the reference area 33 for each of a plurality of wavelengths at a predetermined exposure time and obtaining intensity values ​​for each wavelength, calculating the exposure time for the actual photography based on the maximum intensity value obtained in the preliminary photography and the target intensity value for the actual photography, photographing the object P using the exposure time for the actual photography, generating a processed image based on the intensity spectrum of all pixels of the photographed image of the object P relative to the intensity spectrum of the reference area 33, displaying the processed image, and storing the processed image in the memory unit 22.

[0058] According to this computer program, by identifying the white reference 32 and setting the reference area 33 before the actual shooting, calibration is possible even when the white reference 32 is difficult to recognize, such as when shooting with a wide field of view. Furthermore, since the exposure time for the actual shooting is calculated based on the preliminary shooting, the object P can be photographed under optimal shooting conditions (e.g., shooting wavelength, exposure time for each wavelength, etc.) in the actual shooting. Therefore, compared to repeated trial and error or shooting all wavelengths with a fixed exposure time, shooting can be done easily and quickly. In addition, high-quality processed images can be obtained.

[0059] Furthermore, in the computer program of this embodiment, it is preferable that the processed image is displayed by selecting a substance contained in the object P and displaying a characteristic portion corresponding to the substance. According to this computer program, the characteristic portion corresponding to the substance is extracted and displayed, making it easy to visually recognize the analysis results.

[0060] Modifications of the above-described embodiment will now be described.

[0061] As described above, the spectroscopic imaging device 100 is equipped with all of the imaging unit 10, processing unit 20, and display unit 30, but is not limited to this, and at least some of the imaging unit 10, processing unit 20, and display unit 30 may be connected to the spectroscopic imaging device 100 via a cable or wirelessly. [Explanation of symbols]

[0062] 10...imaging unit, 20...processing unit, 21...control unit, 22...memory unit, 23...arithmetic processing unit, 24...imaging wavelength setting unit, 25...reference area setting unit, 26...exposure time setting unit, 27...number of images set unit, 28...image generation unit, 30...display unit, 31...imaging area, 32...white reference, 33...reference area, 34...imaging start button, 40...incident optical system, 41...light of first wavelength number, 42...light of second wavelength number, 50...bandpass filter, 60...spectral filter, 61, 62...pair of substrates, 63, 64...pair of reflective films, 65...gap changing unit, 70...optical sensor, 100...spectroscopic imaging device, 201...object, 202...moisture

Claims

1. setting a wavelength for spectrophotography of the object; placing the object and a white reference within an imaging area in which the object is imaged; Identifying the position of the white reference and setting it as a reference area; a step of taking a preliminary image of the reference area for each of a plurality of wavelengths at a predetermined exposure time and acquiring an intensity value for each wavelength; calculating an exposure time for actual imaging based on the intensity values ​​for each of the plurality of wavelengths obtained by the preliminary imaging and a target intensity value for actual imaging; performing an actual photograph of the object for each of the plurality of wavelengths using an exposure time for the actual photograph; generating a first processed image for each of the plurality of wavelengths based on the intensity spectrum of all pixels of the captured image of the object relative to the intensity spectrum of the reference area; displaying a second processed image that expresses a characteristic portion of the object using the first processed images for each of the plurality of wavelengths; A spectroscopic imaging method comprising:

2. The spectroscopic imaging method according to claim 1, The step of calculating the exposure time for actual shooting includes: In the preliminary photographing of the reference area, a wavelength at which the intensity value is maximum is set based on (exposure time of the preliminary photographing) × (target intensity value in the actual photographing / maximum intensity value in the preliminary photographing) so as to achieve a targeted intensity value; For other wavelengths, a spectroscopic imaging method is used to generate an optimum frame number table in which the number of imaging frames is increased for each wavelength, based on the exposure time in the actual imaging.

3. The spectroscopic imaging method according to claim 1, The step of calculating the exposure time for actual shooting includes: A spectroscopic photography method in which the intensity values ​​for each wavelength captured in the preliminary photography are set based on (exposure time of the preliminary photography) x (target intensity value in the actual photography / intensity value for each wavelength in the preliminary photography) so as to achieve the targeted intensity value.

4. A spectral filter; a photosensor that receives light transmitted through the spectral filter; a control unit that controls the transmission wavelength of the spectral filter; A spectroscopic imaging device comprising: The control unit Setting a wavelength for spectroscopic imaging of the object; placing the object and a white reference within an imaging area in which the object is imaged; Identifying the position of the white reference and setting it as a reference area; taking a preliminary photograph of the reference area for each of a plurality of wavelengths at a predetermined exposure time, and acquiring an intensity value for each wavelength; calculating an exposure time for actual imaging based on the intensity values ​​for each of the plurality of wavelengths obtained by the preliminary imaging and a target intensity value for actual imaging; performing actual photography of the object for each of the plurality of wavelengths using an exposure time for the actual photography; generating a first processed image for each of the plurality of wavelengths based on the intensity spectrum of all pixels of the captured image of the object relative to the intensity spectrum of the reference area; displaying a second processed image that expresses a characteristic portion of the object using the first processed images for each of the plurality of wavelengths; A spectroscopic imaging device that performs processing including the steps of:

5. 1. A computer program for generating a processed image, comprising: Setting a wavelength for spectroscopic imaging of the object; placing the object and a white reference within an imaging area in which the object is imaged; Identifying the position of the white reference and setting it as a reference area; taking a preliminary photograph of the reference area for each of a plurality of wavelengths at a predetermined exposure time, and acquiring an intensity value for each wavelength; calculating an exposure time for actual imaging based on the intensity values ​​for each of the plurality of wavelengths obtained by the preliminary imaging and a target intensity value for actual imaging; performing actual photography of the object for each of the plurality of wavelengths using an exposure time for the actual photography; generating a first processed image for each of the plurality of wavelengths based on the intensity spectrum of all pixels of the captured image of the object relative to the intensity spectrum of the reference area; displaying a second processed image that expresses a characteristic portion of the object using the first processed images for each of the plurality of wavelengths; storing the first processed image or the second processed image in a storage unit; A computer program comprising:

6. 6. A computer program according to claim 5, A computer program for displaying the second processed image, the computer program selecting a substance contained in the object and displaying a characteristic portion corresponding to the substance.

Images