Direction control device, direction control method and recording medium

Abstract

A direction control device includes: a camera unit that acquires an image captured by photographing a subject by a camera targeted for adjustment of a photographing direction; an image-processing unit that calculates a position of a first setting image that represents the subject in the captured image; a posture detection unit that detects a difference between a position of a second setting image that represents the subject in a reference image registered in advance and the position of the first setting image; and a camera control unit that shifts the photographing direction of the camera based on the difference.

What is claimed is: 
     
         1 . A direction control device comprising:
 a camera unit that acquires an image captured by photographing a subject by a camera targeted for adjustment of a photographing direction;   an image-processing unit that calculates a position of a first setting image that represents the subject in the captured image;   a posture detection unit that detects a difference between a position of a second setting image that represents the subject in a reference image registered in advance and the position of the first setting image; and   a camera control unit that shifts the photographing direction of the camera based on the difference.   
     
     
         2 . The direction control device according to  claim 1 ,
 wherein the image-processing unit comprises:   a feature extraction unit that extracts a feature amount from the captured image;   a database in which the setting image is stored;   a feature verification unit that verifies the setting image stored in the database against the image feature extracted in the feature extraction unit to specify a feature amount of the captured image; and   a coordinate calculation unit that calculates the position of the verified setting image.   
     
     
         3 . The direction control device according to  claim 1 ,
 wherein the image-processing unit comprises:   a face detection unit that detects a face from the captured image;   a database in which a predetermined face image which is the setting image is stored;   a face verification unit that verifies the predetermined face image stored in the database against a face image detected in the face detection unit to specify a face image of the captured image; and   a face coordinate calculation unit that calculates a position of the verified face image.   
     
     
         4 . The direction control device according to  claim 1 ,
 wherein the image-processing unit comprises:   an image detection unit that detects a two-dimensional bar code from the captured image;   an information extraction unit that extracts information of the two-dimensional bar code; and   a coordinate calculation unit that calculates a position of the two-dimensional bar code in the captured image from the information extracted in the information extraction unit, wherein the information of the two-dimensional bar code comprises installation height information of the two-dimensional bar code and size information of the two-dimensional bar code.   
     
     
         5 . The direction control device according to  claim 1 ,
 wherein the camera unit comprises a sensor that detects a posture of the camera;   wherein the sensor stores a state of absence of a positional deviation in the photographing direction of the camera as a direction toward which the sensor is directed; and   wherein the camera control unit controls the photographing direction of the camera by using the direction toward which the sensor is directed.   
     
     
         6 . The direction control device according to  claim 5 , wherein the sensor is a triaxial gyro sensor or a 6-axis sensor. 
     
     
         7 . The direction control device according to  claim 1 ,
 wherein the camera unit comprises a front camera unit and a back camera unit; and   wherein the camera control unit controls a photographing direction of a camera in the back camera unit to be opposite to a photographing direction of a camera in the front camera unit when elevation angles of the photographing direction of the camera in the front camera unit and the photographing direction of the camera in the back camera unit are respectively symmetric with respect to a horizontal.   
     
     
         8 . A wearable terminal comprising:
 the direction control device according to  claim 1 .   
     
     
         9 . A direction control method comprising:
 acquiring an image captured by photographing a subject by a camera targeted for adjustment of a photographing direction;   calculating a position of a first setting image that represents the subject in the captured image;   detecting a difference between a position of a second setting image that represents the subject in a reference image registered in advance and the position of the first setting image; and   shifting the photographing direction of the camera based on the difference.   
     
     
         10 . A non-transitory computer-readable recording medium storing a direction control program that causes a computer to execute:
 acquiring an image captured by photographing a subject by a camera targeted for adjustment of a photographing direction;   calculating a position of a first setting image that represents the subject in the captured image;   detecting a difference between a position of a second setting image that represents the subject in a reference image registered in advance and the position of the first setting image; and   shifting the photographing direction of the camera based on the difference.