A surface evaluation system that includes one or more vision systems that generate target surface data during evaluation of a surface, the one or more vision systems comprising two or more of: at least one light, a camera, a structured light camera, a laser scanner and a 3D scanner.

A parameter indicating a surface property of an object surface is plotted on the horizontal axis, a normal direction change rate of the shape of the object surface is plotted on the vertical axis, the minimum normal direction change rate visible to a person is associated with the parameter indicating the surface property of the object surface to create a visible area map, the relationship between the parameter indicating the surface property of a machining surface of a workpiece, and the maximum value of the normal direction change rate of the shape of the machining surface of the workpiece is displayed on the visible area map, and the object surface is evaluated.

Provided is a display device and a computer program with which it is possible to easily confirm the surface roughness of a workpiece during a turning process. The display device comprises: a surface roughness calculation unit for calculating data pertaining to the surface roughness of a workpiece during a turning process in which the feeding speed for relative cutting between the workpiece and equipment changes, on the basis of the feeding speed in the feeding direction for the relative cutting between the workpiece and the equipment and the shape of the equipment; and a display control unit for performing control, on the basis of the calculated data pertaining to the surface roughness and a display configuration that was configured in advance, such that the data pertaining to the surface roughness of the workpiece is displayed on a display unit.

In the present invention: a plurality of meshes are defined on an object surface; the luminance of the object surface when the object surface is viewed from a viewpoint position is calculated for each of the plurality of meshes on the basis of data concerning a processed shape, a surface roughness curve, the viewpoint position, the direction, angle distribution, and intensity of incident light onto the object surface, and a reflectance and scattering characteristics for each wavelength on the object surface; the shape of the object surface is displayed on the basis of the luminances; and data concerning at least the object shape or the surface roughness curve is corrected so as to obtain a desired appearance of the object surface.

A worked surface of a workpiece is evaluated on the basis of how the surface is actually perceived by a person's (observer's) eyes (vision) or fingers (touch), and a work process whereby a workpiece is worked is changed on the basis of the evaluation.

Provided is a display device and a computer program with which it is possible to easily confirm the surface roughness of a workpiece during a turning process. The display device comprises: a surface roughness calculation unit for calculating data pertaining to the surface roughness of a workpiece during a turning process in which the feeding speed for relative cutting between the workpiece and equipment changes, on the basis of the feeding speed in the feeding direction for the relative cutting between the workpiece and the equipment and the shape of the equipment; and a display control unit for performing control, on the basis of the calculated data pertaining to the surface roughness and a display configuration that was configured in advance, such that the data pertaining to the surface roughness of the workpiece is displayed on a display unit.