The present invention can perform the optical measurement in the partially-specular object by preventing a generation of light saturation and blooming for an object with partially-specular characteristics by lowering the transmittance of specular lobe through the spatial light modulator. Therefore, the present invention can widen the measurement range up to the partially-specular object in the state where the advantages of the active optical measurement method of contactless, rapid measurement, and high precision are maintained.
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