| 摘要 |
PURPOSE:To extract flaws from a metal plate surface with high precision by installing a line computing means to obtain a peak line or a dale line which passes picture element of interest and is formed by ranging picture elements with the maximum luminance value or the minimum luminance value. CONSTITUTION:A light and shade image sent from an image pick-up element 1 is converted by an A/D converting part 2 and saved in an image data memory part 3. The coordinate of a picture element with the maximum picture element value is detected out of the light and shade image of the memory part 3 by comparing the picture element values one another, which are converted into digital values, by a comparison part 4. The detected coordinate and the luminance value are saved in an observing picture element memory part 5. Line computing means 6a, 6b compute a peak line or a dale line which passes the observing picture element and is formed by vertically ranging the picture elements with the maximum luminance value or the minimum luminance value in respectively specified transverse direction of the metal plate. Based on the pattern of respective picture elements, cut point detecting means 8a, 8b detect the cut point which cross the edge of a crack. The region containing the flaws surrounded with the edge coordinates saved in a memory part 9 is cut by a cutting part 10. |
