SURFACE INSPECTING DEVICE

摘要

The presence or absence of a deep machining work trace is detected, and the position and size of the machining work trace are allowed to be estimated, whereby an inspection time can be shortened. A surface inspecting device 9 for inspecting a polished inner surface 3A of a bore 3 formed in a cylinder block 5 by a boring work on the basis of a digital brightness image 70 of the inner surface 3A of the bore 3 is provided with an estimation image generator 55 for generating and parallel arranging one-dimensional power spectral images 71 in a direction perpendicular to the direction of cutting work traces P along the direction of the cutting work traces P on the basis of the digital brightness image 70 to generate an estimation image 73, and an estimator 57 for estimating the presence or absence of polishing residue Q on the inner surface 3A of the bore 3 on the basis of pixel values of respective pixels of the estimation image 73.