Abstract

Digital holography[1] is a technique for recording a wavefront of an object wave using an image sensor and then reconstructing a three-dimensional (3D) image of an object using a computer. High-accuracy 3D shape measurement can be achieved by utilizing a phase unwrapping procedure[2] to solve 2π ambiguity even if the height of an object is more than wavelength of the light source. However, accuracy is decreased by the superposition of the unwanted images, which are the 0th-order wave and the conjugate image, on the object image. This is caused by a poor space-bandwidth of an image sensor.

© 2013 Japan Society of Applied Physics, Optical Society of America