Edge detection of three-dimensional objects by manipulating pupil functions in an optical scanning holography system

The paper presents a technique of manipulating the pupil function in the optical scanning holography (OSH) system to detect the edge of a three-dimensional object. OSH is a fast biomedical imaging system that scans a three-dimensional (3D) object and encodes its intensity information into a two-dimensional hologram. The reconstruction of sectional images from a hologram has been well discussed as post-processing methods. However, manipulating pupil functions as a pre-processing technique has been less investigated. The latter can detect any specific part of an object by manipulating the pupil function. Here, we focus on the edge detection of a 3D object, which is implemented by configuring two pupil functions as a Dirac delta function and the Laplacian of the Gaussian, respectively. The simulated experiment demonstrates that the technique is a real-time pre-processing method to obtain the edge of the 3D object.