| 摘要 |
PROBLEM TO BE SOLVED: To provide a visual examination method which enables the precise and certain detection of a flaw even in a case that the flaw is present in a dark part, and a visual examination device. SOLUTION: The visual examination method includes the step of imaging an inspection target 22 to obtain the image P1 of the inspection target 22, the step of dividing a processing region A2 into first to k-th sections and calculating the k-th average brightness value MBk being the average value of the brightness values of the respective pixels contained in the k-th section, the step of selecting the largest value among the average brightness values of the first to k-th sections as the maximum value MBmax, the step of respectively substituting the value obtained according the formula (1): Ik(x, y)×MBmax/MBk for the brightness values of the respective pixels contained in the k-th section to form a substitution image Pr, the step of forming a standard image P2 becoming a standard with respect to the substitution image Pr, and the step of performing the shading correction of the taken image P1 using the standard image P2. COPYRIGHT: (C)2011,JPO&INPIT |
