Browsing by Author "Park, Jinwoo"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Resolution-Dependent Depth Of Focus For an Incoherent Imaging-SystemPieper, Ronald J.; Park, Jinwoo; Poon, Ting-Chung (Optical Society of America, 1988-11-01)Through the application of the Rayleigh criterion for a two-point resolution, the dependence of the depth of focus on the resolution in the image is determined for a rectangular, a Gaussian, and an annular lens aperture. These solutions are posed in terms of the normalized parameters, obviating the need for the specification of the actual physical lengths. A general approach applicable to any aperture topology is discussed.
- Two-Dimensional Textural Edge Detection Using Ω-Gaussian FilterPark, Jinwoo; Poon, Ting-Chung; Indebetouw, Guy J. (Optical Society of America, 1986-11-01)A textural edge detection frequency domain filter is proposed to locate the boundary between two textural domains modulated by different spatial frequencies. This filter is derived from a zero-order prolate spheroidal function which can be approximated by a _-Gaussian shape. The extension to a 2-D rotational symmetric filter capable of locating textural edges independently of the relative orientation of the textural frequencies is demonstrated. Results show that the proposed filter is more effective at concentrating the output energy around the edge than the filter proposed by Shanmugan et al., which was derived with an additional constraint of evenness in the design of the filter function.