Patent ID: 6873421

Claim:
An apparatus for measuring a three-dimensional shape of an object using a projection moiré device, comprising: a moving table moved by a driving motor, the moving table supporting the object; a projection grid projector for projecting a light beam from a light source onto the moving table through a projection grid, the projection grid being moved a minute distance by a driving PZT unit; a reflection mirror for changing a light path of a light beam projected from the projection grid projector for the light beam to be reflected onto the moving table, the reflection mirror being set in the light path between the projection grid projector and the moving table; an image obtaining unit for obtaining grid pattern images respectively projected on the object and a reference plane of the moving table, the image obtaining unit being positioned above the moving table; and a central control unit for achieving a level information of the object from the images obtained by the image obtaining unit, wherein the central control unit applies a buckets algorithm to the grid pattern images obtained through the image obtaining unit, thereby achieving an object phase of the object and a reference phase with respect to the reference plane, and subtracts the object phase from the reference phase, thereby achieving a moiré phase.