SURFACE EXAMINATION DEVICE

摘要

A deep machining scratch is detected, if any, the position and size can be inferred, and thereby the examination time can be shortened. A surface examination device (9 )for examining the inner surface (3A) of a bore (3) formed in a cylinder block (5) by boring and honed on the basis of a digital brightness image (70) of the inner surface (3A) is provided with an evaluation image creating unit (55) for creating linear power spectrum images (71) in a direction perpendicular to the direction of the cutting scratch (P) along the direction of the cutting scratch (P) from the digital brightness image (70), arranging the linear power spectrum images (71) parallel, and thus creating an evaluation image (73) and evaluating unit (57) for evaluating the presence/absence of an unhoned region (Q) of the inner surface (3A) of the bore (3) on the basis of the pixel values of the pixels of the evaluating image (73).