Apparatus for hair inspection on substrate and method for hair inspection on substrate

An apparatus for hair inspection in a green resist area on a printed circuit board on which solder paste is printed, the apparatus comprising:

• an inspection unit that obtains, with a plurality of color lights, a color image of an inspection object board that is the printed circuit board as an inspection target;
• and
• a control device that:
• obtains a hue image of the inspection object board from the color image;
• obtains a saturation image of the inspection object board from the color image;
• detects first hair including at least one of brown hair and blond hair in at least the resist area of the hue image based on a hue difference of the first hair relative to the resist area;
• and
• detects second hair including at least one of black hair and grey hair in at least the resist area of the saturation image based on a saturation difference of the second hair relative to the resist area, wherein
• the first hair is detected based on only the hue image without a lightness image of the inspection object board, and
• the second hair is detected based on only the saturation image without the lightness image of the inspection object board.