Apparatus and method for model reconstruction using photogrammetry

Abstract

Disclosed herein are a model reconstruction apparatus and method using photogrammetry. The model reconstruction apparatus using photogrammetry includes an image-receiving unit for receiving image data in which images of a nail of a target, for which an artificial nail model is to be generated, and a standard specification object are taken together, an image-analyzing unit for recognizing shapes of a nail plate and a nail tip of the nail of the target from the image data, and determining parameters for the shape of the nail plate and the shape of the nail tip based on the standard specification object, and a model-generating unit for generating an artificial nail model based on the parameters.

What is claimed is: 
     
         1 . A model reconstruction apparatus using photogrammetry, comprising:
 an image-receiving unit for receiving image data in which images of a nail of a target, for which an artificial nail model is to be generated, and a standard specification object are taken together;   an image-analyzing unit for recognizing shapes of a nail plate and a nail tip of the nail of the target from the image data, and determining parameters for the shape of the nail plate and the shape of the nail tip based on the standard specification object; and   a model-generating unit for generating an artificial nail model based on the parameters.   
     
     
         2 . The model reconstruction apparatus of  claim 1 , wherein the standard specification object is an object manufactured in conformity with international standards. 
     
     
         3 . The model reconstruction apparatus of  claim 2 , wherein the image data comprises a first image for recognizing the shape of the nail plate and a second image for recognizing the shape of the nail tip. 
     
     
         4 . The model reconstruction apparatus of  claim 3 , wherein the first image and the second image are taken in a state in which the standard specification object is in close contact with a bottom of a finger of the target. 
     
     
         5 . The model reconstruction apparatus of  claim 4 , wherein the first image is taken of the nail plate of the target together with the standard specification object from a viewpoint in which a back of a hand of the target is viewed. 
     
     
         6 . The model reconstruction apparatus of  claim 5 , wherein the second image is taken of the nail tip together with the standard specification object from a viewpoint in which a fingertip of the target is viewed. 
     
     
         7 . The model reconstruction apparatus of  claim 6 , wherein the second image is taken in a state in which a bottom of a thumb of the target is in close contact with a first surface of the standard specification object and in which all of bottoms of remaining four fingers of the target are in close contact with a second surface of the standard specification object. 
     
     
         8 . The model reconstruction apparatus of  claim 7 , wherein the image-analyzing unit recognizes the shape of the nail plate from the first image from a viewpoint in which the back of the hand is viewed, and determines parameters for the shape of the nail plate based on the standard specification object. 
     
     
         9 . The model reconstruction apparatus of  claim 8 , wherein the image-analyzing unit sets at least four points on a nail wall of the nail plate in the first image from a viewpoint in which the back of the hand of the target is viewed, and then determines the parameters using the at least four points as coordinate values for the shape of the nail plate. 
     
     
         10 . The model reconstruction apparatus of  claim 9 , wherein the image-analyzing unit determines a type of a nail shape of at least one selectable artificial nail model from the first image, based on the shape of the nail plate recognized from a viewpoint in which the back of the hand of the target is viewed. 
     
     
         11 . The model reconstruction apparatus of  claim 10 , wherein the image-analyzing unit recognizes the shape of the nail tip from the second image from a viewpoint in which the fingertip of the target is viewed, and determines parameters for the shape of the nail tip based on the standard specification object. 
     
     
         12 . The model reconstruction apparatus of  claim 11 , wherein the image-analyzing unit sets two points at positions corresponding to both sides of the nail in the second image in such a way as to set one point per position from a viewpoint in which the fingertip of the target is viewed, sets an additional point at at least one position on the nail tip, and then determines the parameters using the two points and the additional point as coordinate values for the shape of the nail tip. 
     
     
         13 . The model reconstruction apparatus of  claim 12 , wherein the image-analyzing unit generates a straight line connecting the two points and sets a position on the nail tip, which is perpendicular to that straight line and meets a perpendicular line passing through the nail plate of the target, as the additional point. 
     
     
         14 . The model reconstruction apparatus of  claim 13 , wherein the model-generating unit adjusts shapes of a nail plate and a nail tip of a reference artificial nail model based on the coordinate values for the shape of the nail plate and the shape of the nail tip, and generates the artificial nail model from the reference artificial nail model, the shapes of the nail plate and the nail tip of which have been adjusted. 
     
     
         15 . The model reconstruction apparatus of  claim 14 , wherein the model-generating unit determines a scale value of the artificial nail model corresponding to the standard specification object based on coordinate values of the artificial nail model and coordinate values of the standard specification object. 
     
     
         16 . A model reconstruction method using photogrammetry, performed by a model reconstruction apparatus using photogrammetry, comprising:
 receiving image data in which images of a nail of a target, for which an artificial nail model is to be generated, and a standard specification object are taken together;   recognizing shapes of a nail plate and a nail tip of the nail of the target from the image data, and determining parameters for the shape of the nail plate and the shape of the nail tip based on the standard specification object; and   generating an artificial nail model based on the parameters.