| 摘要 |
PURPOSE:To decide quickly a material strength of a cast iron by substituting an area ratio occupied by a black part derived from a white or black binary picture by setting a prescribed luminance level as a threshold level, as to a picture signal fetched by reading and scanning a fracture of a cast iron, into a relational expression to a tensile strength set in advance. CONSTITUTION:A picture signal read by a video camera 2 is inputted to an A/D converting part 11 of a picture processing unit 10. The signal fetched to the A/D converting part 11 is divided into picture elements of 256X256, and the divided signal concerned is hexadecimal-coded to 16 luminance levels extending from snow-white to coal-black in accordance with variable density of white and black. The hexadecimal-coded picture signal sets a prescribed luminance level as a threshold level, and is converted to a black or white binary signal. By the binary-coded picture signal, the storage contents of a memory 13 are rewritten to a signal corresponding to a binary picture. A CPU22 of a microcomputer 20 calculates a ratio to the whole fracture area of a sample 1, for instance, of a black part, basing on said picture signal binary-coded to black or white. |
