Image Processing in Differential Digital
Holography (DDH)
Kresimir Nenadic, Tomislav Galba, and
Irena Galic
Faculty of Electrical Engineering, Computer Science and Information Technology in
University of Osijek, Croatia
Abstract: Accumulating dust on Charge-Coupled
Device/Complementary Metal-oxide-Semiconductor (CCD/CMOS) sensors can cause problems in detecting
defects on observed object in some industrial production. This paper describes
Differential Digital Holography (DDH) and observed effect of cancelling the
negative impact of dust on optical sensor. The laboratory setup for recording
digital holograms is described and shown graphically later in paper. Differential
digital holography method is presented step by step. Furthermore, negative
effect of accumulating dust on CCD/CMOS sensor and cancelling effect due to DDH
method is explained. DDH method comprises of both hardware and software parts.
Digital hologram recording process takes place on hardware and all image, i.e.,
digital hologram, while processing is performed by intensive calculations on
processor. Experiments were conducted and graphical results are shown.
Keywords: CCD/CMOS image sensors, digital
holography, dust, holographic optical components, Image processing.
Received April 15, 2015; accepted November 29, 2016
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