Accession Number : AD0870942

Title :   Coherent Optical Mapping Techniques.

Descriptive Note : Final technical rept. 17 Jan 69-17 Jan 70,

Corporate Author : BENDIX RESEARCH LABS SOUTHFIELD MI

Personal Author(s) : Krulikoski, Stanley J. ; Dawson, Juan C. ; Kowalski, Dan C.

Report Date : MAY 1970

Pagination or Media Count : 104

Abstract : Coherent optical data processing techniques were investigated for automatic matching and parallax measurement. The study included image plane correlators with amplitude spatial filters and frequency plane correlators with complex spatial filters, i.e., Fourier transform holograms. Classical interferometry was also investigated for application to contouring. The various optical systems were arranged to study 'point' image measurements as well as multichannel parallel measurements for a multiplicity of image points. An image plane optical correlator with amplitude spatial filters has been automated to provide on-line servo control of photo carriages and detection of perspective image distortion. Experimental results are presented. The use of prismatic anamorphs to obtain continuously variable anamorphic magnification in coherent optical correlators for slope correction is discussed. Matched-filter (Fourier transform hologram) correlators for image parallax measurement and reseau detection are described with experimental results. Perspective contours in photocoordinates were obtained using a modified Mach-Zehnder interferometer. Power spectra of planimetric features are presented. The photogrammetric application of multichannel parallel processors for profiling and contouring is restricted to rectified or normal coplanar photography. The use of optical matched-filter correlators for reseau detection is considered practical, and such frequency plane correlators for image parallax measurement show great potential for increasing speed of measurement. Continued study is recommended.

Descriptors :   *CORRELATORS), (*PHOTOGRAMMETRY, (*STEREOSCOPES, AUTOMATIC), (*INTERFEROMETERS, OPTICAL FILTERS), MATCHED FILTERS, LASERS, IMAGE MOTION COMPENSATION, SERVOMECHANISMS, DATA PROCESSING, OPTICS, INTEGRAL TRANSFORMS, DISTORTION, PRISMS(OPTICS), AERIAL PHOTOGRAPHS, LENSES, POWER SPECTRA, COHERENT RADIATION, CLASSIFICATION, PHOTOGRAPHIC SCALE, BANDWIDTH, ACCURACY.

Subject Categories : Cartography and Aerial Photography
      Holography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE