Imaging process for photo products generation
K. M. M. Rao, D. S. Jain, N. Prasada Rao and G. Vara Prasad
National Remote Sensing Agency, Hyderabad – 500 037
NRSA has set up a Master Filming Facility (MFF) wherein the photographic films are generated from Remote Sensing Satellite data. This facility is equipped with B/W and Color digital film recorders to expose the digital data on B/W and Color negative films from which the photo products (photo prints) of required scale are generated for the visual interpretation. The Film Recorders are interfaced with Pentium PC systems, for ingesting image data from the media for generating images and for controlling film recorder functions such as movement of optical system, film advance, loading lookup tables, exposing film etc.. A Look up table (LUT) is a transformation for matching the image data to that of film density dynamic range. A suitable image enhancement is done on the satellite data for better contrast required for image interpretation. Non-linearities introduced by Film, modulator and Photo processing are corrected by employing suitable transformation through LUTs. The Remote Sensing data is acquired, processed for Radiometric and Geometric corrections and then transferred to Filming Systems through network. The Filming Systems can also receive data in different media (i.e. 8 mm DAT, CD-ROM, CCT etc.) and data formats (i.e. JPEG, BIL, BSQ, TIF etc.) from the users. The Filming Facility is also equipped with the Image Analysis software package on workstation which is used for interactive image enhancement, annotation overlay, grid overlay, map composition etc. for special Photo Products generation.
This paper deals with various aspects of Film products generation and methodology used for generating different types of photo products of data received from various Remote Sensing Satellites with varying spatial and spectral resolutions.