WO2010058927A2 - Dispositif pour photographier un visage - Google Patents

Dispositif pour photographier un visage Download PDF

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Publication number
WO2010058927A2
WO2010058927A2 PCT/KR2009/006676 KR2009006676W WO2010058927A2 WO 2010058927 A2 WO2010058927 A2 WO 2010058927A2 KR 2009006676 W KR2009006676 W KR 2009006676W WO 2010058927 A2 WO2010058927 A2 WO 2010058927A2
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WIPO (PCT)
Prior art keywords
image
reference information
camera
calibration reference
information
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PCT/KR2009/006676
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English (en)
Korean (ko)
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WO2010058927A3 (fr
Inventor
김근호
도준형
김종열
전영주
Original Assignee
한국한의학연구원
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Publication of WO2010058927A2 publication Critical patent/WO2010058927A2/fr
Publication of WO2010058927A3 publication Critical patent/WO2010058927A3/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/70—Determining position or orientation of objects or cameras
    • G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/161—Detection; Localisation; Normalisation
    • G06V40/165—Detection; Localisation; Normalisation using facial parts and geometric relationships
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30196—Human being; Person
    • G06T2207/30201—Face

Definitions

  • the present invention relates to a facial imaging apparatus, and more particularly, to a facial imaging apparatus for photographing and correcting a front image to facilitate feature point extraction.
  • feature points in images of a specific person are used in various technical fields.
  • the feature points extracted from the face image of the target person may be usefully used in facial recognition technology to determine the identity of the target person through the image.
  • Feature points in these facial images can also be used in the medical field.
  • technologies are being developed that can measure the degree of health or abnormality by analyzing images of patients at a distance without facing doctors and patients directly. It is also possible to apply facial diagnosis in home-care systems or ubiquitous-healthcare systems.
  • the present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a facial imaging apparatus for acquiring a face image of a posture suitable for a set standard by correcting a posture of a target person manually or automatically. .
  • the face image photographing apparatus for solving the above problems is a camera for acquiring a front image of a target person in real time, a memory in which the image captured by the camera is stored, the image captured by the camera Display unit for outputting an image, when photographing the front image includes the position information of the center point of both eyes, the area information of both ears, the position information of the eyelid above the center point of the pupil and the position information of the apex of the ear And an image analyzer configured to generate calibration reference information using the feature point information, and a controller configured to store the front image in a memory when the calibration reference information satisfies a set reference range.
  • the image analyzer calculates first calibration reference information that is an angle formed by a straight line connecting the center points of both eyes and an imaginary horizontal line by finding the coordinates of the center points of both eyes in the front image.
  • the image analyzer calculates second calibration reference information which is an area ratio of both ears in the front image.
  • the image analyzer calculates third calibration reference information which is a vertical distance between a straight line connecting eyelids on a center point of both eyes and a straight line connecting vertices of both ears in the front image.
  • the image analyzer sequentially calculates the first to third calibration reference information, and calculates calibration reference information in the following order when the first to third calibration reference information satisfy each set reference range.
  • the image analyzer outputs a green indicator to the display unit when the first to third calibration reference information satisfy each set reference range, and outputs a red indicator to the display unit when the first to third calibration reference information do not satisfy each set reference range. Then, the calibration reference information is recalculated for the front image newly acquired by the camera.
  • the display unit displays an inclination angle from the calibration reference information on the face image obtained when the red indicator is output, so that the user can correct the posture.
  • the face image photographing apparatus for solving the above problems is a camera for acquiring a front image of a target person in real time, a drive module for changing the position or angle of the camera, the camera
  • the display unit outputs the image captured by the camera, and when the front image is photographed, the front image obtained by the camera includes position information of the center point of both eyes, area information of both ears, position information of the eyelid on the center point of the pupil, and position of the apex of the ear.
  • the image analyzer for generating calibration reference information using the feature point information including the information and if the calibration reference information does not satisfy the set reference range, correct the position or the photographing angle of the camera by an error from the set reference range. Control the driving module or the camera to retake the image, and the calibration reference information. When satisfied with the set reference range, and a controller for storing the face image in the memory.
  • the controller controls the driving module to move the camera along a virtual sphere having a radius of the distance between the camera and the target person.
  • the facial imaging apparatus configured as described above can acquire the facial image of the correct posture by using the feature points of the face, show the facial image acquisition posture in real time, and can immediately correct the posture when shooting.
  • the dimensional image it is possible to acquire an image of a correct posture in three dimensions, and feature point information can be extracted through the image information of the correct posture.
  • it has a wide range of applications as it can be used for games and entertainment by using two-dimensional image-based three-dimensional personal face model generation and animation.
  • FIG. 1 is a block diagram showing the configuration of a facial imaging apparatus according to a first embodiment of the present invention
  • FIGS. 2 to 4 are diagrams illustrating a method of calculating first to third calibration reference information according to the present invention
  • FIG. 5 is a diagram illustrating a display unit on which first to third calibration reference information calculated by the image analyzer 30 is displayed.
  • FIG. 6 is a block diagram showing the configuration of a facial imaging apparatus according to a second embodiment of the present invention.
  • FIGS. 7 to 9 are diagrams illustrating operations of a camera in the case of a front image according to the second embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a method of acquiring a front image of a corrected posture by a facial imaging apparatus according to the present invention.
  • control unit 40 control unit
  • FIG. 1 is a block diagram showing the configuration of a facial imaging apparatus according to a first embodiment of the present invention.
  • a facial image capturing apparatus may include a camera 10 for obtaining a front image of a target person in real time, and a display unit 20 for outputting an image captured by the camera. And an image analyzer 30 for outputting a posture correction message to a target person by analyzing the image acquired by the camera, and a controller 40 storing the posture correction image in a memory when the posture correction image is finally determined. It is composed.
  • the camera 10 obtains an image of a target person, converts the image into an electrical signal, and transmits the image to the image analyzer 30.
  • the type of camera is not limited and generally a digital camera can be used.
  • the display unit 20 outputs the image acquired by the camera in real time.
  • an LCD display device may be used.
  • the display unit 20 outputs whether or not posture correction is necessary for the target person according to the image analyzed by the image analyzing unit, that is, whether it satisfies a set standard, and displays a portion or position that needs to be corrected in the image of the user. It also displays and guides the user how to correct his posture.
  • the image analyzer 30 captures the front image obtained by the camera, the position information of the center point of both eyes, the area information of both ears, the position information of the eyelid on the eye center point, and the position information of the apex of the ear.
  • the calibration reference information is generated using the feature point information.
  • the image analyzer 30 analyzes the front image of the target person and displays information necessary for posture correction on the image of the target person through the display unit such that Z-axis correction, Y-axis correction, and X-axis correction are sequentially performed. In addition, a message indicating whether the calibration is suitable for the subject is displayed.
  • the Z-axis refers to the axis indicating the shooting direction of the camera
  • the Y-axis refers to the axis perpendicular to the ground or the image perpendicular to the image of the camera
  • the X-axis refers to the axis horizontal to the ground or the axis of the image of the camera. That is, the Y-axis and the X-axis are based on the ground when the camera is installed horizontally with the ground, but when the camera is not horizontal with the ground, the Y-axis and the X-axis are the vertical and horizontal axes respectively in the image acquired by the camera.
  • the image analyzer 30 calculates first to third calibration reference information for calibrating the front image.
  • FIG. 2 is a diagram illustrating a method of calculating first calibration reference information according to the present invention.
  • the image analyzer 30 first coordinate reference information ⁇ 1 which is an angle formed by a straight line L1 connecting the center points of both eyes in the front image and connecting the center points of the two eyes with a virtual horizontal line L2.
  • the image analyzer 30 outputs a straight line L1 and a virtual horizontal line L2 or first calibration reference information connecting the center points of the two eyes through the display unit 20 so that the user can see and correct it. This can help to make it easier.
  • the image analyzing unit 30 determines whether the first correction reference information ⁇ 1 is 0, that is, whether both eyes are horizontal, and satisfies the set reference range T1 when both eyes are horizontal. A green indicator is output through the display unit 20.
  • the reference range T1 may be set to a specific range close to zero.
  • the image analyzer 30 If the first calibration reference information ⁇ 1 does not satisfy the set reference range, that is, the angle is not 0, the image analyzer 30 outputs a red indicator light through the display unit 20. do. In this case, the target person who is the user corrects his posture through the display unit so that the first calibration reference information ⁇ 1 becomes zero. That is, the user tilts the head from side to side with respect to the Z axis to calibrate.
  • the image analyzer 30 generates second calibration reference information for Y-axis calibration when the first calibration reference information ⁇ 1 satisfies 0. However, when the first calibration reference information ⁇ 1 satisfies 0, the image analyzer 30 generates a second calibration reference information. The image is newly acquired, and the first calibration reference information ⁇ 1 is recalculated to determine whether the set reference range is satisfied.
  • FIG. 3 is a diagram illustrating a method of calculating second calibration reference information according to the present invention.
  • the image analyzer 30 calculates second calibration reference information which is an area ratio of both ears in the front image.
  • the image analyzer 30 detects an ear from the front image and calculates areas A and B of both ears.
  • the area ratio (A / B) of both ears which is the second calibration reference information, is calculated and compared with the set reference range T2.
  • the second calibration reference information is not 1, that is, when the areas of both ears are different, the target person is calculated. Since the posture is skewed, the second correction reference information, that is, the area ratio of both ears is output to the display unit, and the target person corrects the posture, and the second correction reference information is calculated again through the newly obtained image. .
  • the area of both ears may be displayed on the display unit for visual viewing.
  • a red indicator is output to the display unit 20 to inform the user that the posture is incorrect.
  • the user may rotate the head with respect to the Y axis while looking at the display device to correct the posture so that the areas of the left and right ears are the same.
  • the image analysis unit 30 outputs a green indicator through the display unit 20 to maintain a posture.
  • the third calibration reference information is calculated for the X axis calibration.
  • FIG. 4 is a diagram illustrating a method of calculating third calibration reference information according to the present invention.
  • the image analyzer 30 calculates second calibration reference information which is an area ratio of both ears in the front image.
  • the image analyzer 30 may further include third calibration reference information D1 which is a vertical distance between a straight line L3 connecting eyelids on the center point of both eyes and a straight line L4 connecting vertices of both ears in the front image. ) Is compared with the set reference range T3.
  • the third calibration reference information is not 0, that is, when the height of the eyelid and the height of the apex on the pupil do not match, the posture of the target person is Since it means a skew, the two straight lines L3 and L4 or the distance D1 between the two straight lines are output to the display unit so that the target person corrects the posture, and then the third correction reference information is again obtained through the newly obtained image.
  • a red indicator is output to the display unit 20 to inform the user that the posture is incorrect.
  • the user may lower his or her head on the X axis while looking at the display device and correct the posture so that the height of the eyelid and the height of the apex on the pupil coincide with each other.
  • the image analysis unit 30 If the third calibration reference information is 0 or within a specific range set very close thereto, the image analysis unit 30 outputs a green indicator through the display unit 20 to maintain a posture. do.
  • the controller 40 finally stores the front image of the target person in the memory when the first to third calibration reference information satisfies each of the predetermined criteria T1, T2, and T3 sequentially.
  • 5 allows the first to third calibration reference information calculated by the image analyzer 30 to be displayed on the display unit.
  • FIG. 1 is a block diagram showing the configuration of a facial imaging apparatus according to a first embodiment of the present invention.
  • a facial image capturing apparatus may include a camera 10 for obtaining a front image of a target person in real time, and a display unit 20 for outputting an image captured by the camera. And an image analyzer 30 for outputting a posture correction message to a target person by analyzing the image acquired by the camera, and a controller 40 storing the posture correction image in a memory when the posture correction image is finally determined. It is composed.
  • the camera 10 obtains an image of a target person, converts the image into an electrical signal, and transmits the image to the image analyzer 30.
  • the type of camera is not limited and generally a digital camera can be used.
  • the display unit 20 outputs the image acquired by the camera in real time.
  • an LCD display device may be used.
  • the display unit 20 outputs whether or not posture correction is necessary for the target person according to the image analyzed by the image analyzing unit, that is, whether it satisfies a set standard, and displays a portion or position that needs to be corrected in the image of the user. It also displays and guides the user how to correct his posture.
  • the image analyzer 30 captures the front image obtained by the camera, the position information of the center point of both eyes, the area information of both ears, the position information of the eyelid on the eye center point, and the position information of the apex of the ear.
  • the calibration reference information is generated using the feature point information.
  • the image analyzer 30 analyzes the front image of the target person and displays information necessary for posture correction on the image of the target person through the display unit such that Z-axis correction, Y-axis correction, and X-axis correction are sequentially performed. In addition, a message indicating whether the calibration is suitable for the subject is displayed.
  • the Z-axis refers to the axis indicating the shooting direction of the camera
  • the Y-axis refers to the axis perpendicular to the ground or the image perpendicular to the image of the camera
  • the X-axis refers to the axis horizontal to the ground or the axis of the image of the camera. That is, the Y-axis and the X-axis are based on the ground when the camera is installed horizontally with the ground, but when the camera is not horizontal with the ground, the Y-axis and the X-axis are the vertical and horizontal axes respectively in the image acquired by the camera.
  • the image analyzer 30 calculates first to third calibration reference information for calibrating the front image.
  • FIG. 2 is a diagram illustrating a method of calculating first calibration reference information according to the present invention.
  • the image analyzer 30 first coordinate reference information ⁇ 1 which is an angle formed by a straight line L1 connecting the center points of both eyes in the front image and connecting the center points of the two eyes with a virtual horizontal line L2.
  • the image analyzer 30 outputs a straight line L1 and a virtual horizontal line L2 or first calibration reference information connecting the center points of the two eyes through the display unit 20 so that the user can see and correct it. This can help to make it easier.
  • the image analyzing unit 30 determines whether the first correction reference information ⁇ 1 is 0, that is, whether both eyes are horizontal, and satisfies the set reference range T1 when both eyes are horizontal. A green indicator is output through the display unit 20.
  • the reference range T1 may be set to a specific range close to zero.
  • the image analyzer 30 If the first calibration reference information ⁇ 1 does not satisfy the set reference range, that is, the angle is not 0, the image analyzer 30 outputs a red indicator light through the display unit 20. do. In this case, the target person who is the user corrects his posture through the display unit so that the first calibration reference information ⁇ 1 becomes zero. That is, the user tilts the head from side to side with respect to the Z axis to calibrate.
  • the image analyzer 30 generates second calibration reference information for Y-axis calibration when the first calibration reference information ⁇ 1 satisfies 0. However, when the first calibration reference information ⁇ 1 satisfies 0, the image analyzer 30 generates a second calibration reference information. The image is newly acquired, and the first calibration reference information ⁇ 1 is recalculated to determine whether the set reference range is satisfied.
  • FIG. 3 is a diagram illustrating a method of calculating second calibration reference information according to the present invention.
  • the image analyzer 30 calculates second calibration reference information which is an area ratio of both ears in the front image.
  • the image analyzer 30 detects an ear from the front image and calculates areas A and B of both ears.
  • the area ratio (A / B) of both ears which is the second calibration reference information, is calculated and compared with the set reference range T2.
  • the second calibration reference information is not 1, that is, when the areas of both ears are different, the target person is calculated. Since the posture is skewed, the second correction reference information, that is, the area ratio of both ears is output to the display unit, and the target person corrects the posture, and the second correction reference information is calculated again through the newly obtained image. .
  • the area of both ears may be displayed on the display unit for visual viewing.
  • a red indicator is output to the display unit 20 to inform the user that the posture is incorrect.
  • the user may rotate the head based on the Y axis while looking at the display device to correct the posture so that the areas of the left and right ears are the same.
  • the image analysis unit 30 outputs a green indicator through the display unit 20 to maintain a posture.
  • the third calibration reference information is calculated for the X axis calibration.
  • FIG. 4 is a diagram illustrating a method of calculating third calibration reference information according to the present invention.
  • the image analyzer 30 calculates second calibration reference information which is an area ratio of both ears in the front image.
  • the image analyzer 30 may further include third calibration reference information D1 which is a vertical distance between a straight line L3 connecting eyelids on the center point of both eyes and a straight line L4 connecting vertices of both ears in the front image. ) Is compared with the set reference range T3.
  • the third calibration reference information is not 0, that is, when the height of the eyelid and the height of the apex on the pupil do not match, the posture of the target person is Since it means a skew, the two straight lines L3 and L4 or the distance D1 between the two straight lines are output to the display unit so that the target person corrects the posture, and then the third correction reference information is again obtained through the newly obtained image.
  • a red indicator is output to the display unit 20 to inform the user that the posture is incorrect.
  • the user may lower his or her head on the X axis while looking at the display device and correct the posture so that the height of the eyelid and the height of the apex on the pupil coincide with each other.
  • the image analysis unit 30 If the third calibration reference information is 0 or within a specific range set very close thereto, the image analysis unit 30 outputs a green indicator through the display unit 20 to maintain a posture. do.
  • the controller 40 finally stores the front image of the target person in the memory when the first to third calibration reference information satisfies each of the predetermined criteria T1, T2, and T3 sequentially.
  • 5 allows the first to third calibration reference information calculated by the image analyzer 30 to be displayed on the display unit.
  • FIG. 6 is a block diagram showing the configuration of a facial imaging apparatus according to a second embodiment of the present invention.
  • a camera 10 for acquiring a front image of a target person in real time, a display unit 20 for outputting an image captured by the camera, a position of the camera or A driving module 60 for changing a photographing angle, an image analyzing unit 30 for analyzing calibration of the image acquired by the camera, and calculating calibration reference information, and controlling the operation of the camera or the driving module according to the calibration reference information.
  • It is configured to include a control unit 40.
  • the image analyzer 30 analyzes the acquired image and outputs a message through the display unit 20 to correct the posture by the target person.
  • the controller 40 is configured to adjust the photographing angle or position by driving the camera or the driving module in consideration of the calibration reference information calculated by the image analyzer 30 through the driving module 60 installed in the camera 10. .
  • the drive module 60 includes one or more drive motors, which are controlled by the controller 40 and adjust the photographing angle of the camera or the position of the camera.
  • the image analyzer 30 generates the first to sixth calibration reference information in the same manner as the first embodiment, and the controller 40 satisfies the reference range in which the first to sixth calibration reference information is set. If not, the position or photographing angle of the camera is corrected by an error from the set reference range.
  • the controller 40 controls the driving module to move the camera along a virtual sphere having a radius of the distance between the camera and the target person. Therefore, a support or the like for guiding the operation of the camera may be installed in the camera so that the camera can move along the virtual spherical surface as described above.
  • Figure 7 is a view showing a state that the correction is made based on the Z axis in the front image.
  • the controller 40 captures the photographing direction of the camera 10 such that the first calibration reference information is 0 °.
  • the camera is rotated with respect to the photographing direction axis (Z axis) while being fixed to face (). That is, the photographing angle of the camera is adjusted so that a straight line connecting the centers of two eyes of the target person in the front image is horizontal in the image of the camera.
  • the movement of the camera is performed by the drive module 60.
  • FIG. 8 illustrates a state in which calibration is performed based on the Y axis in the front image.
  • the control unit 40 fixes the photographing direction of the camera so that the second calibration reference information is 1 and faces the target person. Move left and right. That is, the camera 10 is moved to a position where the areas of both ears are the same in the front image. Similarly, the camera movement is performed by the drive module 60. At this time, the camera does not move in a straight line, but moves in a semicircular curvature around the subject.
  • Figure 9 is a view showing a state that the correction is made based on the X-axis in the front image.
  • the controller fixes the photographing direction of the camera 10 toward the target person so that the third calibration reference information is zero. Move up and down. That is, the camera 10 is moved to a position where the height of the eyelid and the height of the apex of the ear just above the center of the pupil are the same. Similarly, the movement of the camera is performed by the driving module 60. At this time, the camera does not move in a straight line but moves in a semicircular curvature around the target person.
  • the image analyzer 30 sequentially calculates the first to third calibration reference information, and when the first to the third calibration reference information satisfies each set reference range, the calibration reference information is performed in the following order. Calculate The controller 40 finally stores the front image satisfying the first to third calibration reference information in the memory.
  • the image analysis unit 30 outputs a green indicator to the display unit when the first to third calibration reference information satisfy each set reference range, and outputs a green indicator to the display unit when the first to third calibration reference information do not satisfy each set reference range.
  • the calibration reference information is recalculated for the front image newly acquired by the camera.
  • FIG. 10 is a flowchart illustrating a method of acquiring a front image of a corrected posture by a facial imaging apparatus according to the present invention.
  • a front image is first obtained using a camera (S10).
  • the first calibration reference information is generated to examine whether it meets the set reference range, and if the set reference range is satisfied, the second calibration reference information is generated, but if it is not corrected, the user is allowed to correct the posture based on the Z axis. Or, recalibrate the image after calibrating in the Z-axis direction by moving the camera, and generate new first calibration reference information based on the re-photographed image, compare with the set reference range, and repeat until satisfied (S20). .
  • Y-axis rotation calibration is performed using the second calibration reference information (S30), and X-axis rotation calibration is performed using the third calibration reference information (S40).
  • the first to third calibration reference information stores the front image satisfying each set reference range in a memory (S50).
  • the facial image of the correct posture can be obtained by using the feature points of the face, and the feature point information can be extracted through the image information of the correct posture, so that accurate diagnosis is possible at the time of diagnosis using the image. It can be used more effectively in the diagnostic field through.

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Abstract

La présente invention concerne un dispositif pour photographier un visage. Le dispositif comprend une caméra, une mémoire, une unité d'affichage, une unité d'analyse d'image et une unité de commande. La caméra capture une image de vue de face d'une personne sujet en temps réel, et l'image capturée par la caméra est respectivement stockée et sortie par une mémoire et une unité d'affichage. Lorsqu'une image est capturée selon un angle de vue de face, l'unité d'analyse d'image génère des informations de référence de correction en fonction d'informations de points caractéristiques de l'image de vue de face capturée par la caméra, les informations de points caractéristiques comprenant des informations relatives aux positions de points centraux des deux pupilles, à la taille des deux oreilles, aux positions des paupières au-dessus du point central des pupilles et aux positions des points supérieurs des oreilles. Si les informations de référence de correction satisfont une plage de référence prédéfinie, l'unité de commande stocke l'image de vue de face dans la mémoire. Le dispositif peut obtenir une image faciale précise en fonction des points caractéristiques sur le visage. En outre, le dispositif peut extraire l'image de points caractéristiques à l'aide des informations d'image relatives à un visage posé précisément. Par conséquent, le dispositif permet d'obtenir une précision lors de diagnostics médicaux basés sur des images.
PCT/KR2009/006676 2008-11-24 2009-11-13 Dispositif pour photographier un visage WO2010058927A2 (fr)

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KR10-2008-0116691 2008-11-24
KR1020080116691A KR100982171B1 (ko) 2008-11-24 2008-11-24 안면 영상 촬영장치

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KR101331055B1 (ko) * 2010-08-18 2013-11-26 한국전자통신연구원 시각 주의 분석에 근거한 시각 보조 시스템 및 상기 시각 주의 분석을 이용한 시각 보조 방법
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