A three dimensional radar image can be constructed from scanning microwave measurements. A Vector Network Analyzer has been used for wideband phase and magnitude measurements of radar return. Quasi-monostatic horn antenna configuration is chosen to transmit and receive the electromagnetic wave. Measured target is placed on a polystyrene foam pedestal at 5 meters distance away from the 2-D planar scanner. A wide bandwidth, ranging from 3 GHz to 18 GHz gives rise to very fine range resolution. A time domain gating technique is used to remove spurious signals from the desired signal of the radar target. Range Migration Technique has been used to produce a 3-D radar image. Indoor measurements have been performed on conducting spheres to validate the software. A high resolution 3-D radar image for spheres has been obtained. Analysis of the radar crosssections shows good correlation with theoretical values. Subsequently, the radar cross-section of an oil palm tree was measured and analyzed.

The theory and experiment of a new white-light image-processing technique for black-and-white image addition and subtraction by means of Fourier-plane spatial color filtering are described. Both the intensity transmittances of three (or two) processed images and the results of the addition and subtraction are expressed in a chromaticity coordinate system.

A quantitative optical image-subtraction method based on the principle of spatial pulse-width modulation through a one-dimensional contact-screen process and superposition of positive and negative halftone photographs is described. The difference in intensity transmittance of two images A and B can be measured by either superposing the halftone positive of A onto the halftone negative of B or vice versa. Not only subtle differences between the two photographs but also the polarity of such differences can be found.

Theory and experiments of a new stereoprojection technique that uses a white-light optical image-processing system are described. The stereoprojection can be accomplished in two steps: (1) spatial encoding of stereoscopically coupled images and (2) spatial polarization filtering at the Fourier plane in a white-light optical image processor. Compared with existing stereoprojection methods, the present technique requires only one projector and a single piece of encoded film; therefore it is much simpler and more economical to use for practival applications.