| 摘要 |
PURPOSE:To detect a place of imperfection of a solvent accurately by a method wherein image information from CCD cameras disposed immediately behind hot scarfer installations is subjected to an image processing and the quality of the solvent is determined from a change in luminance of an ingot bloom. CONSTITUTION:Using picked-up image signals from CCD cameras 1a to 1d, an image processing device 2 subjects data obtained from each pixel of CCD to luminance conversion and then to a binary-coding processing. In the device 2, besides, a luminance change rate distribution is computed from luminance distribution data obtained from a luminance change rate and then it is binary- coded. An area wherein the luminance or the luminance change rate is high and an area wherein it is low are discriminated from each other by the device 2 and the result is sent to a personal computer 3. Receiving the signals subjected to the image processing and sent from the device 2 and manufacture information being necessary for detection of imperfection of a solvent and obtained from CPU 5, the personal computer 3 analyzes the signals from the device 2 and determines whether or not the imperfection of the solvent exists on the four sides of an ingot bloom W. |
