JP2009278255A - Image processing device and image processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processing device and an image processing method, for generating correction image data by which a photograph display result or a printing result which can provide a favorable impression based on a balance between a facial color and a tooth color, with respect to the tooth color of a subject figure in a photograph image. <P>SOLUTION: The image processing device 20 has a face detection unit 21 detecting a face of a figure included in image data, an organ detection unit 22 detecting an organ including a tooth included in a face area detected, a face color/tooth color evaluation unit 23 evaluating a face color and a tooth color of a face and a tooth detected, determining the tooth color as a correction target based on an evaluation result, and determining an application or nonapplication of a tooth color correction based on the correction target, and an image data correction unit 24 correcting the tooth color based on the correction target and generating correction image data when the application of correction is determined. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image processing apparatus and an image processing method, and in particular, corrected image data for obtaining a display result or a print result obtained by optimally correcting the tooth color of a subject person in a photographic image from the viewpoint of balance with the face color. The present invention relates to an image processing apparatus and an image processing method for generation.

  Generally, it is felt that a white color with a clean feeling is preferable as a human tooth color. This is the same whether the person's face is viewed directly or indirectly in the photographic image. However, the white as a tooth color that is perceived as preferable is not an artificial white color, but an appropriate white color in a range that does not cause unnaturalness as a human tooth color.

Various types of image processing have been performed on various types of image data such as photographic images and CG images, and one of them is the white color of the subject person in the photographic image that can give a good impression. There is an image processing technique for correction (see, for example, Patent Document 1).
JP 2007-223189 A

  On the other hand, in normal daily life, even if it is a moderate white tooth color that can give a positive impression to the viewer, for example, when applying extreme white paint such as maiko at a festival, etc., or marriage Under the condition that the face color becomes whiter than usual, such as when applying white makeup rather than usual when wearing solid white costumes in the ceremony, the tooth color is yellowish to the human eye in terms of balance with the face color In some cases, it may not be felt as a preferable white tooth color.

  In particular, in the case of a photographic image of an innocent white figure at a wedding, when a photographic image that impairs a good impression due to the tooth color in balance with the face color is produced, the subject person and the concerned person feel dissatisfied. Become.

  The image processing technique described in Patent Document 1 described above corrects the image data of the tooth portion so as to match the preset target data, or changes the color of the tooth portion in the photographic image. The color tone of the entire photographic image is corrected as a reference, and the tooth color is not corrected in consideration of the balance with the face color.

  Therefore, the image processing technique cannot correct a tooth color that has lost a good impression as a result of comparison with the face color to an optimum tooth color that can give a good impression.

  The present invention has been made in view of the above problems, and its purpose is related to the tooth color of a subject person in a photographic image, and a photographic display result or print that can give a good impression from the viewpoint of balance with the face color. An object of the present invention is to provide an image processing apparatus and an image processing method for generating corrected image data from which results can be obtained.

  According to one aspect of the image processing apparatus of the present invention, a face detection unit for detecting a human face included in image data and an organ including teeth included in the detected face area are detected. An organ detection unit, evaluates the face color and tooth color of the detected face and teeth, determines a tooth color as a correction target based on the evaluation result, and applies or does not apply the correction of the tooth color based on the correction target A facial color and tooth color evaluation unit that determines the correction, and an image data correction unit that corrects the tooth color based on the correction target and generates corrected image data when the application of the correction is determined. An image processing apparatus is provided.

  In the above aspect of the image processing apparatus according to the present invention, the face color and tooth color evaluation unit determines a tooth color as a correction target based on the evaluation result of the face color of the detected face and detects the detected tooth color. The application or non-application of the tooth color correction based on the correction target may be determined based on the evaluation result of the tooth color.

  Further, the face color and tooth color evaluation unit determines a tooth color as a correction target based on the evaluation result of the detected face color of the face, and the white color of the tooth color in the correction target indicates the detected tooth color. It is preferable to determine whether or not the whiteness of the tooth color is reduced, and to determine whether to apply or not apply the tooth color correction based on the correction target.

  Further, the face color and tooth color evaluation unit calculates and detects the tooth color saturation St ′ and lightness Lt ′ as correction targets based on the detected face color saturation Sf and lightness Lf of the face. The tooth color saturation St and lightness Lt are compared with the tooth color saturation St ′ and lightness Lt ′ as the correction target, and the application or non-application of the tooth color correction based on the correction target is determined. You should do it.

  In this case, the facial color and tooth color evaluation unit relates to the detected tooth color saturation St and lightness Lt and the tooth color saturation St ′ and lightness Lt ′ as the correction target, St <St ′. In addition, it is determined whether or not the relationship of Lt> Lt ′ is established. When the relationship is established, it is determined that the correction of the tooth color based on the correction target is not applied, and when the relationship is not established. The application of the tooth color correction based on the correction target may be determined.

  The image processing apparatus according to the aspect of the invention further includes a print data generation unit that converts the data format of the image data output from the image data correction unit and generates print image data that can be processed by a printer. It is good to have it.

  Further, according to one aspect of the image processing method of the present invention, a face detection process for detecting a human face included in image data, and an organ including a tooth included in the detected face region are provided. An organ detection process to be detected, and a face color and a tooth color of the detected face and teeth are evaluated, a tooth color as a correction target is determined based on the evaluation result, and a tooth color correction based on the correction target is applied or A face color and tooth color evaluation process for determining non-application, and an image data correction process for generating correction image data by correcting the tooth color based on the correction target when application of the correction is determined. An image processing method is provided.

  Further, according to one aspect of the computer program according to the present invention, a face detection function for detecting a human face included in image data and an organ including a tooth included in the detected face region are detected. An organ detection function, and the detected face color and tooth color of the detected face and teeth, determine a tooth color as a correction target based on the evaluation result, and apply or not apply the correction of the tooth color based on the correction target. A face color and tooth color evaluation function for determining application, and an image data correction function for generating correction image data by correcting tooth color based on the correction target when application of the correction is determined in a computer. A computer program for implementation is provided.

  One aspect of the image processing apparatus and the image processing method according to the present invention is a photographic display result or print that can give a good impression from the viewpoint of the balance with the face color of the subject person in the photographic image. It is possible to generate corrected image data that can obtain a result.

  The outline of the configuration of the image processing apparatus and the image processing method according to the present invention is as follows. When a photographic image including a person as a subject is displayed or printed, the face of the person included in the photographic image data and the face Teeth in the region are detected, the face color and the tooth color are evaluated, an optimum tooth color as a correction target is determined based on the evaluation result, and corrected image data in which the tooth color is corrected is generated.

  That is, the image processing apparatus and the image processing method according to the present invention are preferable from the viewpoint of balance with the face color by correcting the tooth color of the subject person in the photographic image to the optimum tooth color in comparison with the face color. Photo display results or print results that can give an impression can be provided.

  However, if the tooth color is uniformly corrected based on the evaluation result of the face color, the white color of the tooth color after correction may be reduced as compared with the white color of the tooth color before correction. Absent.

  Therefore, in the image processing apparatus and the image processing method according to the present invention, it is determined that the white of the tooth color in the correction target determined based on the evaluation result of the face color is reduced than the whiteness of the tooth color before correction. In this case, the original tooth color is maintained without applying the correction. Thereby, it is possible to provide a photographic display result or a print result that does not impair a good impression regarding the tooth color of the subject person in the photographic image.

  Hereinafter, an embodiment of an image processing apparatus and an image processing method according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a printer multifunction machine including an image processing apparatus according to an embodiment of the present invention.

  The image processing apparatus 20 according to the embodiment of the present invention shown in FIG. 1 is not necessarily connected to a host computer, and is a printer multifunction device 1 capable of printing photographic image data recorded on a memory card or the like alone. It is the example embodied as an apparatus which comprises some. Note that a printer multifunction device is a device having functions of a scanner, a copier, etc. in addition to the functions of a printer.

  1 includes a data input device 10 for inputting image data, a memory 30 that temporarily stores input image data, and an image processing device 20 that performs image processing on the image data. And a user interface 40 for displaying and inputting information necessary for operation, and a printer unit 50 for performing printing based on print image data generated as a result of image processing.

  The data input device 10 inputs image data from an external device such as a memory card reader 11 that reads image data from a memory card, a scanner unit 12 that reads image data from a document, and a computer. The external interface unit 13 is provided.

  Image data input via the data input device 10 is temporarily stored in the memory 30.

  The user interface 40 includes a liquid crystal display (LCD) 41 that displays information necessary for operation, and a switch or button 42 or a touch panel 43 for inputting an instruction from the user.

  An image processing apparatus 20 according to an embodiment of the present invention includes a face detection unit 21 that detects a face of a person included in image data, and an organ including teeth included in the detected face area. The organ detection unit 22 to detect, the face color and the tooth color of the detected face and teeth are evaluated, the tooth color as a correction target is determined based on the evaluation result, and the correction of the tooth color based on the correction target is applied Alternatively, the face color and tooth color evaluation unit 23 that determines non-application, and the image data correction unit 24 that performs correction of the tooth color based on the correction target and generates corrected image data when correction application is determined, A print data generation unit 25 that converts the data format of the image data output from the image data correction unit 24 and generates print image data that can be processed by the printer unit 50 is provided. .

  The image processing apparatus 20 according to an embodiment of the present invention performs image processing on photographic image data temporarily stored in the memory 30 by the sequential operation of each of the units 21 to 25.

  The printer unit 50 performs image printing based on the generated print image data.

  Next, the operation of the image processing apparatus according to the embodiment of the present invention, that is, the procedure of the image processing method according to the embodiment of the present invention will be described in more detail.

  FIG. 2 is a flowchart showing the operation of the image processing apparatus according to the embodiment of the present invention, that is, the procedure of the image processing method according to the embodiment of the present invention. FIG. 3 is an explanatory diagram schematically showing how faces in the detected photographic image data are sequentially selected and displayed.

  In the image processing apparatus and the image processing method according to the embodiment of the present invention, first, face detection processing by the face detection unit 21 is performed on photographic image data to be processed, and the photographic image data is included in the photographic image data. The number of faces and the position and size of each face are specified (step S101). The face detection process can be performed using any face detection technique including an existing face detection technique. Further, since the correction of the tooth color is not applied to the tooth color of the face that is larger than a certain size with respect to the size of the entire photographic image, a substantial effect cannot be obtained. In the face detection process, it is preferable to set in advance so as to detect only faces that are larger than a predetermined size with respect to the size of the entire photographic image. Such a setting uses, for example, only face image data that is reflected in a predetermined size or more with respect to the size of the entire photographic image as the learning sample face image data used in the operation control program of the face detection unit 21. As a result, it is possible to extract and detect only a face reflected in a predetermined size or more from the faces of persons included in the photographic image data.

  As a result of the face detection process, it is determined whether or not a person's face has been detected (step S102), and if no person's face is detected, the image processing apparatus and the image processing method according to one embodiment of the present invention Therefore, the print data generation unit 25 converts the data format of the photographic image data to generate print image data that can be processed by the printer unit 50 (step S115).

  On the other hand, when a person's face is detected, application or non-application is not determined yet in order to sequentially determine application or non-application of image processing by the image processing apparatus and the image processing method according to the embodiment of the present invention. Whether or not there is a remaining face is identified (step S106). If there is a remaining face that has not yet been applied or not applied, one of them is selected (step S107), and the selected face area is selected. The organs contained therein, that is, here, the teeth are detected by the organ detection unit 22 (step S108).

  In step S107, for example, the liquid crystal display 41 of the user interface 40 is used to frame a selected face in the photographic image as shown in FIGS. 3 (a), 3 (b), and 3 (c). A cursor may be displayed in an overlapping manner to indicate to the user which face is currently selected.

  The detection of teeth by the organ detection unit 22 in step S108 can be performed using any organ detection technique including existing organ detection techniques. For example, teeth can be detected using the organ detection technique described in paragraphs 0072 to 0075 of Patent Document 1 described above.

  After performing the tooth detection process by the organ detection unit 22, it is identified whether or not a tooth has been detected in the currently selected face area (step S109).

  If no tooth is detected, there is no need to correct the tooth color, so the process returns to step S106 to apply or not apply image processing by the image processing apparatus and image processing method according to the embodiment of the present invention. It is identified whether there are remaining faces that have not yet been applied, and the subsequent steps are sequentially performed in the same manner.

  On the other hand, when a tooth is detected, the face color and tooth color evaluation unit 24 evaluates the face color of the currently selected face and the tooth color of the tooth in the face area, and corrects the correction target based on the evaluation result of the face color. The tooth color of the correction target is determined and whether or not the white color of the tooth color at the correction target is less than the white color of the tooth color before correction is compared with the tooth color at the correction target. (Step S110).

  As a result of comparing the evaluation result of the tooth color with the tooth color in the correction target, if it is determined that the white color of the tooth color in the correction target is less than the white color of the tooth color before correction, the facial color and the tooth The color evaluation unit 24 determines the non-application of the tooth color correction based on the correction target (step S111), returns to step S106, and the image by the image processing apparatus and the image processing method according to the embodiment of the present invention. It is determined whether there is a remaining face for which application or non-application of the process has not been determined, and the subsequent steps are sequentially performed in the same manner.

  In the image processing apparatus and the image processing method according to the embodiment of the present invention, since the tooth color as the correction target is determined based on the evaluation result of the face color, the face color of the subject person in the target image data is the background color. If the face color has high saturation or low brightness due to color or tanning, characteristic makeup, or light intensity (shadow, backlight) during shooting, etc., the whiteness of the tooth color at the correction target May be reduced from the whiteness of the tooth color before correction. Nevertheless, if the correction is applied, the white color of the tooth color after correction is reduced more than the white color of the tooth color before correction. The result is that the white color of the tooth color of the subject person appears to be unfavorable.

  Therefore, in the image processing apparatus and the image processing method according to the embodiment of the present invention, as a result of comparing the evaluation result of the tooth color with the tooth color in the correction target, the whiteness of the tooth color in the correction target is not corrected. When it is determined that the whiteness of the tooth color is reduced, the non-application of the tooth color correction based on the correction target is determined and the original tooth color is maintained.

  On the other hand, as a result of comparing the evaluation result of the tooth color with the tooth color in the correction target, if it is determined that the white of the tooth color in the correction target is not reduced than the whiteness of the tooth color before correction, the facial color The tooth color evaluation unit 24 determines the application of the tooth color correction based on the correction target (step S111).

  The process of evaluating the face color and the tooth color and determining whether to apply or not apply the correction by the face color and tooth color evaluation unit 24 will be described in detail later.

  When the application of correction is determined by the face color and tooth color evaluation unit 24, the image data correction unit 24 performs image data correction for changing the tooth color based on the correction target to generate corrected image data (step S112). ). That is, corrected image data is generated by performing image data correction that corrects the tooth color to be whiter than the tooth color before correction based on the correction target.

  Thereafter, the process returns to step S106 to identify whether there is a remaining face for which application or non-application of image processing by the image processing apparatus and image processing method according to an embodiment of the present invention has not yet been determined. If there is a remaining face that has not yet been determined to be unapplied, the subsequent steps are sequentially performed in the same manner.

  On the other hand, if there is no remaining face for which application or non-application has not been determined, the data format of the photographic image data output from the image data correction unit 24 is converted by the print data generation unit 25 and processed by the printer unit 50. Possible print image data is generated (step S115). The conversion of the data format into the print image data performed here is a known data conversion process such as color data conversion from RGB data to CMYK data and halftoning process, and is related to the essential configuration of the present invention. Since there is no detailed explanation, it is omitted.

  Note that the photographic image data output from the image data correction unit 24 is corrected image data when any one of the detected human faces has been corrected for tooth color. When it is determined that the correction is not applied to all the faces of the person or when the face of the person is not detected, the photographic image data remains unchanged.

  Here, a more detailed procedure of the facial color and tooth color evaluation step (process) in the image processing method according to the embodiment of the present invention, that is, the facial color provided in the image processing apparatus according to the embodiment of the present invention. The details of the operation of the tooth color evaluation unit 24 will be described.

  FIG. 4 is a detailed procedure of the face color and tooth color evaluation step (process) in the image processing method according to the embodiment of the present invention, that is, provided in the image processing apparatus according to the embodiment of the present invention. It is a flowchart which shows the further detailed operation | movement of a face color and a tooth color evaluation unit.

  Each step of the flowchart shown in FIG. 4 shows details of steps S110 and S111 of the flowchart shown in FIG. Therefore, at the time of the start of the flowchart shown in FIG. 4, the face of the person included in the photographic image data and the teeth in the face area have already been detected and the evaluation symmetry of the face color and the tooth color is It is assumed that one of the faces has been selected.

  In the image processing apparatus and the image processing method according to the embodiment of the present invention, first, in order to evaluate the face color of the currently selected face, the saturation Sf and lightness Lf of the face color are used as the image data of the face area. (Step S201).

  Further, in order to evaluate the tooth color of the tooth included in the currently selected face area, the saturation St and lightness Lt of the tooth color are acquired from the image data of the tooth part (step S202).

  Then, in order to determine the tooth color as the correction target based on the evaluation result of the face color, that is, the saturation Sf and the brightness Lf of the face color, the saturation Sf and the brightness Lf of the face color are applied to a predetermined function, and the optimum tooth Saturation St ′ and lightness Lt ′ of the tooth color as a correction target considered to be a color are calculated (step S203).

  The predetermined function for calculating the saturation St ′ and the brightness Lt ′ of the tooth color as the correction target is a saturation St ′ of the tooth color that is felt white based on at least the saturation Sf and the brightness Lf of the facial color. As long as the function calculates the brightness Lt ′, any function can be used.

  That is, a function is prepared in advance to calculate the tooth color saturation St ′ and lightness Lt ′ that are felt white in contrast with the face color saturation Sf and lightness Lf based on at least the face color saturation Sf and lightness Lf. To set.

  After calculating the saturation St ′ and lightness Lt ′ of the tooth color as the correction target, it is determined whether or not the relationship of St <St ′ and Lt> Lt ′ is established (step S204). That is, the relationship that the saturation St ′ of the tooth color as the correction target is higher than the saturation St of the original tooth color, and the lightness Lt ′ of the tooth color as the correction target is lower than the lightness Lt of the original tooth color. It is determined whether or not it is established.

  The relationship that the saturation St ′ of the tooth color as the correction target is higher than the saturation St of the original tooth color, and the lightness Lt ′ of the tooth color as the correction target is lower than the lightness Lt of the original tooth color. This is a case where the white of the tooth color as the correction target is reduced more than the whiteness of the original tooth color.

  Therefore, when the relationship of St <St ′ and Lt> Lt ′ is established, the non-application of the tooth color correction based on the tooth color saturation St ′ and the lightness Lt ′ as the correction target is determined and the original tooth The color is maintained (step S205), and the process returns to step S106 in the flowchart of FIG.

  On the other hand, if the relationship of St <St ′ and Lt> Lt ′ is not established, the application of tooth color correction based on the tooth color saturation St ′ and lightness Lt ′ as a correction target is determined (step S205). It progresses to step S112 of the flowchart of FIG.

  The above is the details of the operation and procedure of the face color and tooth color evaluation in the image processing apparatus and the image processing method according to the embodiment of the present invention.

  As described above, the image processing apparatus and the image processing method according to the embodiment of the present invention determine the tooth color as the correction target based on the evaluation result of the face color and the whiteness of the tooth color in the correction target. Applying or not applying tooth color correction based on the correction target by comparing the evaluation result of the tooth color with the tooth color in the correction target to determine whether the whiteness of the tooth color before correction is not reduced. Therefore, the tooth color of the subject person in the photographic image can be corrected to the optimum tooth color in comparison with the face color. That is, it is possible to generate corrected image data that can obtain a photographic display result or a print result that can give a good impression regarding the tooth color of the subject person in the photographic image from the viewpoint of the balance with the face color.

  In the image processing apparatus and the image processing method according to the embodiment of the present invention described above, print image data is generated based on photographic image data to be processed and finally printed. The example in which the image processing apparatus 20 according to the embodiment of the present invention is embodied as an apparatus including the print data generation unit 25 and constituting a part of the printer multifunction device 1 has been described.

  However, when printing is not performed, that is, when it is sufficient to display the corrected photographic image on the display device based on the corrected image data generated by correcting the tooth color, the print data generation unit 25 and the print data generation The step (process) is not a necessary configuration as a configuration of the image processing apparatus and the image processing method according to the embodiment of the present invention.

  The functions of the components included in the image processing apparatus according to the embodiment of the present invention described above and the image processing apparatus according to the other embodiment of the present invention described above are realized in a computer by software, that is, a computer program. It may be. A computer program that realizes such a function is provided in a form recorded on a recording medium that can be read by a computer. The computer can realize the functions of the above-described components by executing the computer program read from the recording medium directly or indirectly by the arithmetic processing unit.

1 is a block diagram illustrating a configuration of a printer multifunction peripheral including an image processing apparatus according to an embodiment of the present invention. It is a flowchart which shows the operation | movement and procedure of the image processing apparatus and image processing method which concern on one Embodiment of this invention. It is explanatory drawing which shows typically a mode that the face in the detected photographic image data is selected and displayed sequentially. It is a flowchart which shows the further detailed operation | movement and procedure of face color and tooth color evaluation in the image processing apparatus and image processing method which concern on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer multifunction device 10 Data input device 11 Memory card reader 12 Scanner unit 13 External interface unit 20 Image processing device 21 Face detection unit 22 Organ detection unit 23 Facial color and tooth color evaluation unit 24 Image data correction unit 25 Print data generation unit 30 Memory 40 User Interface 41 Liquid Crystal Display (LCD)
42 Switch or button 43 Touch panel 50 Printer unit

Claims (8)

A face detection unit for detecting a human face included in the image data;
An organ detection unit for detecting an organ including a tooth included in the detected face region;
A facial color that evaluates the facial color and tooth color of the detected face and teeth, determines a tooth color as a correction target based on the evaluation result, and determines whether to apply or not apply the correction of the tooth color based on the correction target; Tooth color evaluation unit,
An image data correction unit that corrects a tooth color based on the correction target and generates corrected image data when application of the correction is determined;
An image processing apparatus comprising:   The face color and tooth color evaluation unit determines a tooth color as a correction target based on the evaluation result of the face color of the detected face, and determines the correction target based on the evaluation result of the tooth color of the detected tooth. The image processing apparatus according to claim 1, wherein application or non-application of correction based on tooth color is determined.   The face color and tooth color evaluation unit determines a tooth color as a correction target based on the evaluation result of the detected face color, and the white color of the tooth color in the correction target is the tooth color of the detected tooth 3. The image processing according to claim 1, wherein it is determined whether the whiteness of the tooth is not reduced or not, and whether to apply or not apply the tooth color correction based on the correction target is determined. apparatus.   The face color and tooth color evaluation unit calculates the saturation St ′ and the brightness Lt ′ of the tooth color as the correction target based on the saturation Sf and the brightness Lf of the detected face color, and the detected tooth color Comparison of tooth color saturation St and lightness Lt with tooth color saturation St ′ and lightness Lt ′ as the correction target to determine whether to apply or not apply tooth color correction based on the correction target The image processing apparatus according to claim 1, wherein the image processing apparatus is an image processing apparatus.   The facial color and tooth color evaluation unit relates to the detected tooth color saturation St and lightness Lt and the tooth color saturation St ′ and lightness Lt ′ as the correction target, St <St ′ and Lt>. It is determined whether or not the relationship of Lt ′ is established, and when the relationship is established, it is determined that tooth color correction based on the correction target is not applied, and when the relationship is not established, the correction is performed. The image processing apparatus according to claim 4, wherein application of tooth color correction based on a target is determined.   6. The print data generation unit according to claim 1, further comprising a print data generation unit that converts the data format of the image data output from the image data correction unit to generate print image data that can be processed by a printer. The image processing apparatus according to any one of the above. A face detection process for detecting a human face included in the image data;
An organ detection process for detecting an organ including a tooth included in the detected face region;
A facial color that evaluates the facial color and tooth color of the detected face and teeth, determines a tooth color as a correction target based on the evaluation result, and determines whether to apply or not apply the correction of the tooth color based on the correction target; Tooth color evaluation process,
When the application of the correction is determined, an image data correction process for generating corrected image data by correcting the tooth color based on the correction target;
An image processing method comprising: A face detection function for detecting a human face included in the image data;
An organ detection function for detecting an organ including a tooth included in the detected face region;
A facial color that evaluates the facial color and tooth color of the detected face and teeth, determines a tooth color as a correction target based on the evaluation result, and determines whether to apply or not apply the correction of the tooth color based on the correction target; Tooth color evaluation function,
An image data correction function for generating correction image data by correcting the tooth color based on the correction target when application of the correction is determined;
A computer program for realizing a computer.

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