Holographic optical image processing using a thermoplastic photographic plate

Hiromi Suzuki; Akira Ono

doi:10.1117/12.172652

1 May 1994 Holographic optical image processing using a thermoplastic photographic plate

Hiromi Suzuki, Akira Ono

Proceedings Volume 2176, Practical Holography VIII; (1994) https://doi.org/10.1117/12.172652
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

Abstract

A key element of the optical image processing system is an image memory to temporarily store a huge amount of information between processing. Attempts have been made to use a silver halide photographic plate, a non-linear photorefractive crystal, a liquid crystal display and other elements as the image memory. However, none of these elements has proved satisfactory with respect to the following criteria: write and erase by an electrical method, signal-to-noise ratio of stored images, size of memory area and optical resolution. A thermoplastic photographic plate (TPP), in view ofits advantages oflarge memory capacity and ability to write and erase electrically, has been used for real time holography. However, the TPP is subject to the drawback of a high signal-to-noise ratio and has not been suitable for the image memory of the optical image processing. Recently, the authors conceived three methods to eliminate the drawback, and applied the TPP to holographic defect detection in periodic patterns. The TPP was used as the image memory and defect images were separated by spatial filtering and holographic optical image processing. Our results showed that 0.09 pm defects can be detected with signal-to-noise ratio 3.

Citation Download Citation

Hiromi Suzuki and Akira Ono "Holographic optical image processing using a thermoplastic photographic plate", Proc. SPIE 2176, Practical Holography VIII, (1 May 1994); https://doi.org/10.1117/12.172652

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KEYWORDS

Holography

3D image reconstruction

Image processing

Signal to noise ratio

Holograms

Interference (communication)

Defect inspection

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