To provide a stain flaw detecting method capable of detecting a stain flaw with high precision, and a stain flaw detector.
This method of detecting stain flaw; includes a process of performing filtration processing for emphasizing the stain flaw of an inspection image and a process for detecting the presence of the stain flaw or evaluating the degree of stain flaw, on the basis of the inspection image subjected to filtration processing. In a filtration processing, convolution operation is performed by a first filter for calculating the difference in the luminance between longitudinal components, a second filter for calculating the difference in the luminance between lateral components, a third filter for calculating the difference in the luminance between +45 degree components and a fourth filter for calculating the difference in the luminance between -45 degree components to form an image having the value of the filter, wherein the absolute value of the operation result shows a minimum value, as the luminance value.
ICHIKAWA HIRONARI
MURAKAMI TAKUSHI
Souji Sasaki
Saburo Kimura
Noboru Omura
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