Patent ID: 8718358

Claim:
A filler metal installation position checking method comprising the steps of: providing a standard surface target with known dimension and position to a wall surface where a filler metal is installed; creating image data by taking a photograph of the wall surface from a direction crossing a normal line of the wall surface together with the standard surface target; converting the image data into corrected image data displaying an image corrected in a manner that the image is photographed from front of the wall surface by use of the actual position and dimension of the standard surface target and position and dimension of the standard surface target on an image displayed by the image data, wherein the converting of the image data occurs upon a same coordinate system as that of design CAD data for displaying an actual designed position of the filler metal; reading the design CAD data for displaying the actual designed position of the filler metal; and outputting images displayed by the corrected image data and the design CAD data on one same display, wherein a value of color information of a dot D of a filler metal portion displayed by the corrected image data is in a predetermined range, and wherein the value of color information of the dot D is such that the difference between the color information of the detected dot D and an adjacent color information becomes a predetermined threshold or more.