Powder granule foreign material inspection manner and powder granule foreign material survey instrument

摘要

PROBLEM TO BE SOLVED: To inspect foreign matter in powder and granular material without generating an error by taking the image of powder and granular material by an imaging means through the transparent member brought into contact with the powder and granular material and subjecting the obtained image data to image processing. ;SOLUTION: For example, a transparent member 1 and powder and granular material 2 are fixed and an imaging means 3 converting a light image into image data is moved in a b-direction and the surface image of powder and granular material 2 in a predetermined area is taken by the imaging means 3 to detect foreign matter present in the powder and granular material. The light image detected by the imaging means converting the light image to image data may be either one of the reflected light and transmitted light from a light source. The light image detected by the imaging means 3 is converted to image data to be divided into pixels by an image processing means 31. Light and shade data at every pixel is utilized in the detection of foreign matter and pixel low in brightness can be converted into the image signal corresponding to foreign matter.;COPYRIGHT: (C)1997,JPO