- This thesis describes a grating-based white-light optical signal processor which differs the coherent signal processor by utilizing a white-light source, a source encoding mask and a sampling diffraction grating. The source encoding mask is employed to increase the degree of spatial coherence and the singal sampling grating is used to increase the temporal coherence in the Fourier plane. A sufficiently high degree of coherence can thus be obtained to process signals in complex amplitude. The white-light processor operates in a partially coherent mode so that the coherent artifact noise can be substantially supressed at the same time, color image can be easily processed since the white-light source contains the entire wavelength band of the visible spectrum., A two-beam interference technique is devised to measure the degree of coherence in the Fourier plane of the white-light processor. The experimental results show that the degree of coherence is greatly increased by the use of the sampling diffraction grating., A new technique for the fabrication of low-noise diffraction gratings with an extended incoherent light source is also described., The white-light processing technique is first applied to color image processing operations including archival storage of color films and density and spatial frequency pseudocolor encoding of monochrome images. The spatial color encoding and decoding schemes which are employed to implement these operations are also presented., and The most important application described in this thesis is that of the "linearly smeared color image deblurring." Since the deblurring filter function is bipolar, the success in this application sufficiently demonstrates the capability of the white-light processor to process signals in complex amplitude. A broadband fan-shaped deblurring filter is synthesized which results in full-color deblurred images.
- Dissertation Note:
- Ph.D. The Pennsylvania State University 1983.
- Source: Dissertation Abstracts International, Volume: 44-08, Section: B, page: 2472.
View MARC record | catkey: 13612001