Projection device and projection method

A device for contactless detection of a three-dimensional contour, comprising:

• a projection device comprising an illuminating unit for emitting light;
• and, a projection unit having a mirror surface, the projection unit configured to project the light emitted by the illuminating unit using the mirror surface into an object space and to shape it into different spatially structured light patterns in the object space, wherein the mirror surface is deformable, at least in regions, and in that the projection unit, for shaping the different spatially structured light patterns in the object space, has at least one actuator for deforming the mirror surface, at least in regions and wherein the mirror surface has a fixed microstructure configured for shaping high-frequency spatial structures of the spatially structured light patterns, and wherein the fixed microstructure is formed on the mirror surface separately from the deforming caused by the at least one actuator;
• at least one camera, for recording images of an object arranged in the object space with the different spatially structured light patterns projected onto the object by means of the mirror surface;
• and,
• an evaluation unit for determining a three-dimensional contour of an object arranged in the object space based on image data from images of the object recorded using the at least one camera, with the different spatially structured light patterns projected onto the object using the mirror surface.

A projection method comprising the steps of:

• shaping a first spatially structured light pattern in an object space by reflecting light on a mirror surface having a first surface shape, wherein the mirror surface has a fixed microstructure configured for shaping high-frequency spatial structures of the spatially structured light patterns;
• deforming, at least region-wise, the mirror surface so that the mirror surface assumes a second surface shape different from the first surface shape;
• and,
• shaping a second spatially structured light pattern in the object space that is different from the first spatially structured light pattern by reflecting light on the mirror surface having the second surface shape, wherein the mirror surface contains the fixed microstructure for shaping high-frequency structures of the spatially structured light patterns, and wherein the fixed microstructure are formed on the mirror surface separately from the deforming caused by the at least one actuator.