KR100943548B1 - Pose guide method and device of shooting device - Google Patents

Abstract

The present invention relates to a pose guide method and apparatus for a photographing apparatus, and more particularly, to a pose guide method and apparatus for displaying a pose guide on an image display unit to easily capture various poses when photographing a subject. It is about.

Pose Guide, Subject, Shooting

Description

Method and apparatus for pose guide of photographing device

The present invention relates to a pose guide method and apparatus of a photographing apparatus, and more particularly, to a pose guide method and apparatus for displaying a pose guide on an image display unit to easily capture various poses when photographing a subject. It is about.

As digital cameras are provided to consumers at low prices in place of conventional film cameras, the spread of cameras has been expanded. As cameras expanded, photography became a hobby for the general public. A digital camera is a camera that senses an image using an electronic sensor without a film, and stores the information of the image in a digital image file format such as JPEG, TIFF, RAW, or GIF, or a digital video file format such as MPEG, DV, or MJPEG. . Cameras whose main function is movie shooting are called digital video cameras, and cameras whose main function is still image shooting are called digital still cameras.

Unlike conventional film cameras, digital still cameras have the advantage of being able to immediately check the result after taking a picture, easily editing and transferring, and making a copy easily. In addition, the camera can be manufactured in a compact size, the photosensitive speed can be changed, and the digital image sensor has an advantage that the quantum efficiency is very high compared to the conventional film.

Currently more expensive than digital still cameras, digital single-lens reflex cameras (DSLRs) are also rapidly spreading to the public. DSLRs offer superior image quality compared to conventional film cameras at high photosensitivity and are superior in resolution and image quality when compared to digital still cameras with the same imaging area. Such advances in camera technology have resulted in widespread inexpensive and high-quality cameras for the general public, and as a result, the general public has taken more photographic works with the general public.

Conventionally, when shooting against a general person rather than a professional model, it is difficult for the general subject to take various poses, and when the user of the camera is also a general person, it is difficult to request various poses. Thus, the camera user could only photograph the subject for a limited pose, and the pose of the photographed subject was not natural or could not satisfy the user's expectations.

In addition, even when both the user and the subject recognize a specific pose, the conventional camera fails to provide a reference for the subject to take the correct pose, causing inconvenience to both the user and the subject.

An object of the present invention is to provide a pose guide method and apparatus of a photographing apparatus that enables a user to easily photograph various poses when photographing a subject.

Another object of the present invention is to provide a pose guide method and apparatus of a photographing apparatus that detects a face size, a face position, or an expression of the subject, and provides an appropriate pose guide corresponding thereto.

Another object of the present invention is to provide a pose guide method and apparatus of a photographing apparatus that calculates and provides a similarity between the pose guide and a pose of the subject to a user.

A pose guide method of a photographing apparatus according to an exemplary embodiment of the present disclosure may include collecting and displaying an image of a subject; Displaying a pose guide; And photographing the subject.

According to an embodiment of the present invention, a pose guide device of a photographing apparatus includes: an image collector configured to collect an image of a subject; A storage unit for storing a pose guide; An image display unit displaying an image of the subject or the pose guide; And a controller which controls to display the pause guide stored in the storage unit on the image display unit.

According to the present invention, the pose guide is displayed on the image display unit so that the user can easily capture various poses when photographing a subject.

According to the present invention, an appropriate pose guide may be selected based on a face size, a face position, etc. of the subject in the image of the subject, without the user having to directly select the pose guide.

According to the present invention, the similarity between the pose guide and the pose of the subject may be provided to provide a criterion for the user and the subject to form a more accurate pose.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a pose guide method of a photographing apparatus according to an exemplary embodiment.

As shown in FIG. 1, the pose guide method of the photographing apparatus according to an exemplary embodiment includes collecting and displaying an image of a subject (S11), displaying a selected pose guide (S22), and displaying a displayed pose guide. Zooming in, zooming out, rotating, or moving the position (S13), guiding the subject to change the pose based on the displayed pose guide (S14), displaying the similarity between the pose of the subject and the selected pose guide (S15), and Determining whether the similarity is equal to or greater than a preset value (S16); and photographing a subject when the similarity is equal to or greater than a preset value (S17).

The pose guide method of the photographing apparatus may be applied to a camera module, a camera, a camcorder, or a camera module of a portable terminal, but is not limited thereto. The pose guide method may be applied to a photographing apparatus that collects, displays, and outputs an image of the subject.

In operation S11, an image of a subject is collected by a photographing apparatus to which the pose guide is applied, for example, a camera, and the image of the subject is displayed on an image display unit of the camera.

The image collecting unit reduces light reflected from a subject and converts the light into an electrical signal, and the converted electrical signal is transmitted to the image display unit and displayed as an image.

In the step S12, the pose guide selected by the user among the pose guides previously stored in the camera is displayed on the image display unit of the camera. The camera may include a storage unit for storing data regarding the pose guide, for example, a memory, so that a user of the camera may select a desired pose guide from the stored data.

Hereinafter, the step-by-step operation will be described in detail together with the drawings showing the image displayed on the image display unit.

2A illustrates an image display unit of a camera on which a pose guide is displayed according to an embodiment of the present invention.

As shown in FIG. 2A, a plurality of pose guides 21, 23, 24, and 25 may be displayed on the image display unit 63. The user may select a specific pose guide through a user input unit such as a button or a touch screen mounted on the camera. In FIG. 2A, the specific pose guide 21 is activated and selected by the selection box 22.

In another embodiment of the present invention, only one pose guide may be displayed on the image display unit 63. In this case, the user may change a pose guide displayed on the image display unit 63 through the user input unit and select a desired pose guide.

The user wants to photograph the subject by taking a specific pose. A specific pose guide corresponding to a pose to be taken by the subject is selected from the pose guide displayed on the image display unit.

The pose guide may be applied to the case where the subject is one or more than one person. When the subject is a plurality of persons, a pose guide for a pose to be taken by each of the plurality of persons may be displayed on the image display unit 63.

The pose guides for the plurality of figures may themselves be stored in a storage unit of the camera, and the user may directly configure the pose guides for the plurality of figures by adding another pose guide to the pose guide for one person. Can be.

FIG. 2B is a view illustrating an image display unit displaying an image of an object and a pose guide when there are two subjects according to an embodiment of the present invention.

As shown in FIG. 2B, when two subjects are present, a pose guide for two poses among pre-stored pose guides of the camera may be selected and displayed on the image display unit.

When the pose guide is selected, instead of allowing the user to directly select the pose guide, a face size, a face position or an expression of the subject is detected from the image of the subject, thereby posing a pose corresponding to the detected face size, face position or expression. The guide can be selected automatically.

3A and 3B are diagrams of an image display unit for explaining a step of selecting an arbitrary pose guide through a face size of a subject according to an exemplary embodiment of the present invention.

The image collecting unit of the camera collects the image of the subject, and the image display unit 63 of the camera may display the image 32 of the subject. The user may set a mode for providing a pose guide from a face size, a face position or an expression of the subject through the user input unit of the camera, for example, a pose guide recommendation mode.

In the pose guide recommendation mode, the camera may detect a face size, a face position, or an expression of the subject in the image 32 of the subject. In FIG. 2A, the detected face of the subject is divided into an area display box 31. In the image 32 of the subject, the face size of the subject may be changed according to the distance between the camera and the subject. The closer the distance between the camera and the subject is, the larger the face size of the subject becomes in the image 32 of the subject, and the smaller the distance becomes.

The controller of the camera may select a pose guide that is most similar to the position or state of the subject by comparing the face size of the subject with the image 32 of the subject. For example, the upper body pose guide may be selected when the face size of the subject is greater than or equal to a preset ratio compared to the area of the image 32 of the subject, and the whole body pose guide may be selected when less than or equal to the preset ratio.

In addition, when the face position of the subject is located at the same height as the torso of the subject compared to the image 32 of the subject, the lying pose guide may be selected. As such, a pose guide that is most similar to or appropriate to a pose taken by the subject may be selected through the face size or position of the subject.

According to another embodiment of the present invention, an appropriate pose guide may be selected by detecting the expression of the subject. By dividing a plurality of facial expressions of the subject, for example, a smiling facial expression or a frowning facial expression may be stored and a sample image for each facial expression may be stored in the storage unit. The controller of the camera may detect a face region of the subject in the image 32 of the subject, and calculate a degree of agreement with respect to the basic image of each facial expression by comparing the detected face region with the stored sample image. .

The comparison process may be performed by image matching between the sample image and the detected face region, and the image matching process may identify possible overlap positions between the respective images and calculate scores according to the degree of matching of overlapping pixels with respect to the corresponding overlap positions. Conventional techniques such as the determination method can be used.

As a result, the facial expressions having the highest degree of concordance can be selected by comparing the degree of concordance with respect to the basic image of each facial expression. The preset pose guide associated with the selected facial expression may be displayed on the image display unit of the camera.

3A illustrates a state in which the whole body pose guide 21 is displayed on the image display unit 63. The controller of the camera may detect the face of the subject in the image 32 of the subject, and compare the size of the detected face image with the size of the image 32 of the subject. Alternatively, the face position of the subject in the image 32 of the subject may be detected by comparing with the face position of the pose guide 21.

As illustrated in FIG. 3B, the pose guide 33 may be displayed on the image display unit 63 based on the size or position of the face of the subject detected in FIG. 3A. The user may guide the subject, that is, the person to be photographed, to take a corresponding pose by taking a reference to the preset pose guide 33 displayed on the image display unit 63 and then take a picture.

Even when the subject is a plurality of persons, the controller of the camera may detect a face size, a face position, or an expression of each subject.

As illustrated in FIG. 2B, even when the subjects are two, the face regions of each subject may be detected, and the face regions of each subject may be the first face region box 33 and the second face region box 34, respectively. ) Can be separated.

FIG. 4 illustrates an image display unit 63 in which the pose guide 21 selected in FIG. 2A is displayed simultaneously with the image 32 of the subject.

According to an embodiment of the present invention, the selected pose guide 21 may be moved within the image display unit 63 by a user. The user may set an operation mode of the camera through a user input unit of the camera to a mode for moving the pose guide 21 (hereinafter, referred to as a "pose guide movement mode"). In the pause guide movement mode, the user may freely move the pause guide 21 in the image display unit 63 through the user input unit.

In step S13, the pose guide 21 may be zoomed in, zoomed out, rotated, or moved. When the subject is located close to the camera and the image of the subject is larger than the pose guide, the user may select a pose guide movement mode to zoom in and enlarge the pose guide 21.

Similarly, when the subject is located far from the camera and the image of the subject is smaller than the pose guide, the user may zoom out and reduce the pose guide 21. As such, the pose guide can be freely applied without being limited by the distance between the subject and the camera.

It is also possible to rotate the pose guide about an arbitrary reference point. For example, the user selects an arbitrary reference point in the image display unit 63. The user can freely change the position and state of the pose guide by rotating the pose guide clockwise or counterclockwise around the selected reference point.

According to an embodiment of the present invention, as shown in FIG. 4, the selected pose guide 21 may be provided as an outline of a pose to be taken by the subject.

According to another embodiment of the present invention, the selected pose guide 21 may be displayed as an image of a pose to be taken by the subject. Preferably, the selected pose guide is displayed as a semi-transparent image of a pose to be taken by the subject, so that the user can easily compare the pose guide with the image 32 of the subject. In addition, when the pose guide is provided as a semi-transparent image, there is an advantage in that both the pose guide and the image of the subject can be checked even when the pose guide overlaps with the image of the subject.

In another embodiment of the present invention, the pose guide may display an image of a pose to be taken by the subject in 3D. In this case, 3D information other than 2D information about the pose guide should be stored in the storage unit of the camera. When the user selects the 3D pose guide, the image display unit 63 receives the 3D pose guide information from the storage unit to display the image. Indicated by.

Even when the pose guide is displayed in 3D, the pose guide may be zoomed in, zoomed out, rotated, or moved. In this case, it is possible to spatially rotate by setting the rotation axis when the pose guide is rotated. Therefore, it is possible to check the shape of a specific part of the body that cannot be confirmed in the pose guide displayed in 2D.

The step S14 guides the pose change to the subject based on the selected pose guide 21. When the user selects a specific pose guide and the selected pose guide 21 is displayed on the image display unit 63, the image 32 of the subject does not coincide with the pose guide 21.

The user may guide the pose of the subject to match the pose guide 21 while comparing the pose guide 21 with the image 32 of the subject through the image display unit 63. In this process, the camera may guide the movement of the subject to match the pose of the subject with the pose guide 21. In the case of the self-camera, since the user and the subject will be the same, the photographer can change the pose directly.

According to an embodiment of the present invention, the pose change guide may be provided to the subject or the user by voice. The camera includes a voice output unit such as a speaker, so that the subject or the user can check the movement guide of the subject by voice.

Referring to FIG. 4, the image 32 of the subject is compared to the pose guide 21, and the face, the arm, and the body are separated to the right and the legs are separated to the left based on the subject. In this case, the controller of the camera may detect a face, an arm, a torso and a leg of the subject, determine a position, and calculate how much distance in which direction to move to match the pose guide 21. The voice output unit of the camera may receive the direction and distance from the control unit of the camera and output the voice.

The calculation of the distance to be moved is performed by converting a distance difference between the subject and the pose guide on the image display unit into an actual distance difference using a ratio of an image of the subject displayed on the image display unit to a one-dimensional length of the actual subject. Can be used.

For example, when the image of the subject displayed on the image display unit is 5 cm and the actual subject is 150 cm tall, the ratio of the image of the subject to the length of the actual subject is 1:30. Therefore, when the distance difference between the subject and the pose guide is 1cm on the image display unit, the distance that the subject moves is 30cm.

According to another embodiment of the present invention, the pose change guide step may guide the subject to correct the pose through the image display unit 63 of the camera.

Referring to FIG. 4, an arrow 41 may be displayed on the image display unit 63 to confirm direction and distance information to which the image of the subject should move. The direction indicated by the arrow 41 is a direction in which the subject moves, and the length of the arrow 41 may be a distance in which the subject moves. In another embodiment of the present invention, the distance to which the subject is to be moved may be numerically displayed on a portion of the image display unit 63.

According to an embodiment of the present disclosure, the pose guide 21 may guide to correct the face angle of the subject by including information on the face angle. The pose guide 21 stored in the storage unit of the camera may store information about a face angle. When the controller of the camera selects the pose guide 21 to receive information about the pose guide 21 from the storage unit, the controller may also receive information about a face angle.

The controller may detect a face region in the image 32 of the subject and calculate a face angle. The face angle calculation may be performed through an image matching process from an image of the front face previously stored in the storage unit. An angle calculated by image matching between the image of the front face and the face image of the subject may be displayed on the image display unit 63. Therefore, the user may guide the user to move the face angle of the subject through the face angle to form an accurate pose.

In step S15, the similarity between the pose of the subject and the pose guide is displayed. According to an embodiment of the present disclosure, the controller of the camera calculates the similarity between the pose of the subject and the pose guide 21 and transmits the calculation result to the image display unit 63. The image display unit 63 displays the transmitted calculation result in a partial region of the image display unit 63 so that a user can more easily compare the pose of the subject and the pose guide 21.

According to an embodiment of the present invention, the similarity may be calculated based on a distance between the image 32 of the subject and the pose guide 21. The image 32 of the subject and the pose guide 21 are divided into respective parts such as a face, a body, an arm, a leg, or a face angle, and the respective parts of the image 32 and the pose guide 21 of the subject. The separation distance can be calculated. The calculated distance for each part may be set as a parameter of similarity, and a similarity function using the distance as a parameter may be programmed in the controller of the camera.

Here, as the distance increases, the similarity of each part increases, and as the distance increases, the similarity of each part decreases. As a result, it is possible to calculate the similarity between the image 32 of the entire subject and the overall pose guide 21 by calculating the calculated average value of the similarity of the respective portions.

The similarity may be numerically displayed on a portion of the image display unit 63. The similarity may be displayed in a bar graph form on one side of the image display unit 63. The user can intuitively check how the subject's pose matches the pose guide by looking at the graph. The graph may be displayed for each body part or facial expression of the subject's face, arms, legs, torso, etc., to check similarity for each part.

In this case, different weights may be assigned to each part so that specific parts may be considered more seriously in determining similarity. The weighted portion or the specific weight may vary depending on the embodiment.

According to an embodiment, the similarity may be displayed by changing the color of the pose guide. For example, as the similarity between the pose of the subject and the pose guide increases, the color turns blue, and the lower the similarity becomes, the red color changes.

According to an embodiment, the similarity may be represented by voice. For example, the higher the similarity, the higher the frequency of the voice output from the audio output unit of the camera, and the lower the similarity, the lower the frequency of the voice.

In some embodiments, the similarity may be represented by text. The similarity may be divided into a plurality of ranges, and a character representing the similarity may be displayed on the image display unit of the camera for each range. For example, when the minimum value of the similarity is 1 and the maximum value is 100, 'very inconsistency' when the similarity is 1 or more and less than 20, 'unmatched' when the similarity is 20 or more and less than 40, and the similarity is 40 or more If the value is less than 60, 'normal', and if the similarity is 60 or more and less than 80, 'match', and if the similarity is 80 or more and 100 or less, a character of 'very match' may be displayed on the image display unit.

In operation S16, it is determined whether the pose of the subject is equal to or greater than a preset value of the selected pose guide 21. The controller of the camera determines whether the similarity calculated in the step S15 is greater than or equal to a value preset in the system.

In this case, the preset value may be adjusted by the user and may be fixed to a value input to the system when the camera is manufactured.

In step S17, when the similarity between the image 32 of the subject and the pose guide 21 is greater than or equal to a preset value in step S16, the subject is photographed. According to an embodiment of the present invention, when the similarity between the pose guide 21 and the pose of the subject is equal to or greater than a preset value, the subject may be automatically photographed by the camera.

In this case, the camera may provide the user or the subject with a signal informing of shooting before the camera automatically photographs. The signal may be light (eg red light) or voice (eg "take") that is easy to identify.

5 is a diagram of the image display unit 63 when the image 32 of the subject and the pose guide 21 coincide with each other. When the subject moves through the pose change guide of step S14 and the image 32 of the subject coincides with the pose guide 21, the camera may automatically photograph the subject.

After photographing the subject, an image of the photographed subject may be stored in the storage unit. In another embodiment of the present invention, the image of the photographed subject may be transmitted to the outside through the output port of the camera.

In this case, the pose guide is not included in the image of the subject stored in the storage unit or transmitted to the outside. The pose guide has a function of guiding the subject to easily pose when photographing, and is not included in the final output image.

6 shows the structure of a pose guide device according to an embodiment of the present invention.

As shown in FIG. 6, the pose guide apparatus according to an exemplary embodiment of the present invention includes an image collector 61 collecting an image of a subject, a storage unit 62 storing a pose guide, an image of the subject, or the An image display unit 63 for displaying a pose guide, a controller 64 for controlling the pose guide stored in the storage unit 62 to be displayed on the image display unit 63, and a voice of the subject based on the displayed pose guide. A voice output unit 65 for guiding movement and a user input unit 66 for receiving a photograph of the subject or an operation of the pose guide from a user.

The image collector 61 collects an image of the subject and displays the image on the image display unit 63. The image collecting unit 61 includes a device for converting light into an electrical signal and may be a CCD or CMOS image sensor.

The storage unit 62 stores data about the pose guide. The storage unit 62 stores data about various pose guides, and transmits data about the pose guide when receiving a data transmission request for the pose guide from the controller 64.

The image display unit 63 displays an image of the subject or the pose guide. The image display unit 63 receives the image of the subject collected by the image collection unit 61 or the pose guide stored in the storage unit 62 through the control of the controller 64 and displays the image on the display. The image display unit 63 may be equipped with a touch screen panel to enable a user to manipulate various pose guides through the touch screen.

The image display unit 63 may display the pose guide as an outline of a pose to be taken by the subject.

The image display unit 63 according to an exemplary embodiment may display the pose guide as an image of a pose to be taken by the subject. Preferably, the image of a pose to be taken by the subject is displayed semi-transparently so that the user may An image of a subject and an image of a pose to be taken by the subject may be easily distinguished.

In another embodiment of the present invention, the image display unit 63 may display the pose guide as a 3D image of a pose to be taken by the subject.

The controller 64 controls to display the pause guide stored in the storage unit on the image display unit.

In addition, according to an embodiment of the present invention, the controller 64 may detect a face size, a face position, or an expression of the subject from the image of the subject collected by the image collector 61. A pose guide corresponding to the detected face size, face position, or facial expression may be selected.

The controller 64 may select a pose guide most similar to the position or posture of the subject by comparing the size of the image of the subject with the size of the face of the subject. For example, the upper body pose guide may be selected when the ratio of the size of the face of the subject to the size of the image of the subject is greater than or equal to a preset ratio, and the whole body pose guide may be selected when less than or equal to the preset ratio. There may be a plurality of selected pose guides, and a user may select one pose guide through a separate selection. Alternatively, the pose guide for the face position of the subject may be further selected to more specifically select the pose guide.

The controller 64 may be further configured to zoom in, zoom out, rotate, or move the pose guide displayed on the image display unit 63. It may be configured to enlarge or reduce the size based on the information of the pose guide stored in the storage unit 62, the pose guide may be configured to be rotated about any reference point on the image display unit 63. have.

In addition, the controller 64 may calculate the similarity between the pose guide and the pose of the subject. The similarity may be calculated through image registration of the pose guide and the pose of the subject.

The similarity may be calculated for each part of the subject's face, torso, arm, leg, or face angle. For example, by measuring the distance between the pose of the subject and the pose guide for each part of the subject, the similarity decreases as the distance increases, and the similarity increases as the distance increases. As a result, the similarity calculated for each part may calculate the similarity of the entire subject pose and the entire pose guide by calculating an average value. The controller 64 may transmit the calculated similarity to the image display unit 63, and the image display unit 63 may display the transmitted similarity as a numerical value or a bar graph.

The voice output unit 65 guides the pose change of the subject to the voice based on the pose guide displayed on the image display unit 63. When the image of the subject does not match the displayed pose guide, the subject may guide the change of the pose to match the pose guide by moving a position or changing a pose.

The voice output unit 65 may voice-guide a pose change direction and a distance to correspond to each corresponding portion of the pose guide for each portion of the subject's face, torso, arm or leg.

The user input unit 66 receives a photograph of the subject or an operation of the pose guide from a user. The user may photograph the subject by operating the shutter of the user input unit 66, and move a cursor or a selection box displayed on the image display unit 63 by operating a direction key of the user input unit 66.

Although the present invention has been described through the above embodiments, the above embodiments are merely intended to illustrate the spirit of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications may be made to the embodiments described above. The scope of the invention is defined only by the interpretation of the appended claims.

1 is a flowchart illustrating a pose guide method according to an embodiment of the present invention.

2A illustrates an image display unit of a camera on which a pose guide is displayed according to an embodiment of the present invention.

FIG. 2B is a view illustrating an image display unit displaying an image of an object and a pose guide when there are two subjects according to an embodiment of the present invention.

3A and 3B illustrate an image display unit for explaining a step of selecting an arbitrary pose guide through the size of a face of a subject according to an exemplary embodiment of the present invention.

FIG. 4 illustrates an image display unit 63 in which the pose guide 21 selected in FIG. 2 is displayed simultaneously with the image 32 of the subject.

5 illustrates the image display unit 63 when the image 32 of the subject and the pose guide 21 coincide with each other.

6 is a structural block diagram of a pose guide device according to an embodiment of the present invention.

Claims (10)

Collecting and displaying an image of the subject; Displaying a pose guide; Zooming in, zooming out, rotating, or moving the displayed pose guide on an image display unit to fit the image of the subject; And Photographing the subject; The pose guide method of the photographing device comprising a. The method of claim 1, And the pose guide is a contour of a pose to be taken by the subject, a translucent two-dimensional image, or a translucent three-dimensional image. delete The method of claim 1, And guiding a change of a pose of a subject as a voice or an image based on the displayed pose guide. The method of claim 1, And displaying the similarity between the pose guide and a pose of the subject. The method of claim 5, The similarity is a pose guide method of the photographing device comprising the step of displaying in numerical value, graph, voice, text or color. The method of claim 5, wherein the photographing step And automatically photographing the subject when the similarity is greater than or equal to a preset value. An image collecting unit collecting an image of the subject; A storage unit for storing a pose guide; An image display unit displaying an image of the subject or the pose guide; And A control unit which displays the pose guide stored in the storage unit on the image display unit and controls the displayed pose guide to be zoomed in, zoomed out, rotated, or moved on the image display unit to fit the image of the subject; Pose guide device of the shooting device including a. delete The method of claim 8, The controller is further configured to calculate the similarity between the pose guide and the pose of the subject, And the image display unit to display the calculated similarity.

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