White balance adjustment jig for endoscope and white balance adjustment method for endoscope

A white balance adjustment method for an endoscope using a white balance adjustment jig for an endoscope, the white balance adjustment jig including:

• an insertion portion that includes at least one insertion hole into which a distal end part of an endoscope is inserted;
• a lid portion that is disposed to face the insertion portion in an insertion direction of the distal end part;
• and
• an outer peripheral portion that is in contact with the insertion portion and the lid portion to form an internal space with the insertion portion and the lid portion, wherein the outer peripheral portion is in contact with the lid portion by fitting a protruding portion formed on the lid portion into a recessed portion formed on the outer peripheral portion,
• the lid portion including a chart having a plurality of marks on an inner surface facing the internal space, and
• the chart being inclined with respect to a perpendicular plane perpendicular to the insertion direction, wherein the insertion portion includes a plurality of the insertion holes, and the internal space is partitioned according to each of the insertion holes, and
• wherein the outer peripheral portion includes a partition wall extending from a position of the insertion portion to a position of the inner surface of the lid portion to partition the internal space into a plurality of internal spaces corresponding to each of the insertion holes,
• the white balance adjustment method comprising:
• inserting the distal end part of the endoscope including an imaging unit that images a subject into the insertion hole;
• imaging the mark using the imaging unit;
• and
• adjusting white balance of the endoscope using an image showing the mark, which is obtained through imaging.