A fast image preprocessing system and its software for airborne MSS
Liu Dingsheng, Li Xia, Li Zhirong
Remote sensing Satellite station
Chinese Academy of science
Abstract
A fast image preprocessing system RTPS-1 has been developed as the ground part of a Chinese airborne practical operational system this system includes two subsystems front end (SHPS) and back end (GIPS)
In the front-end hardware modules was used to do the input from optical disk format transformation B & W quick look rough correction and the productions of tape and diskette.
The back end is a general image processing system with high resolution color display and perfect image processing software besides airborne image preprocessing software package has been developed these software were checked by real data of airborne MSS the data can be transferred between front end and back end by special DMA interface the thought put of system is about 60 scan line / second.
Introduction
Due to the large scanning angle of sensor attitude change of airplane and the atmosphere effect the image preprocessing of airborne multi spectral scanner data is more difficult than the space satellite data in order to complete Chinese air borne practical operational system this RTPS fast image preprocessing in large MSS images rapidly as an specified primary purpose of RTPS-1 was to preprocess in large MSS images rapidly as an operational system to supply the data products for users however it performs image processing and analysis functions as well and can easily be upgraded to expand its function later the system takes the advantages of the technology of firmware and modular and the parallel processing of multi micro processing for the high speed processing and mass production .
To develop a whole set a satisfied process for the air borne image preprocessing was needed in this paper a set of methods was suggested for the systematic preprocessing of air borne MSS data these methods are selected and summarized from several successful methods to make a whole set soft ware package for air borne MSS data.
System Configuration
The whole system configuration of RTPS-1 shown in figure -1 it is consisted of two independent subsystems but with some relation between them --- the front end and back end the SHPS is a hardware-oriented subsystem with high modular design and multi bus. it was made up of special hardware modules multi micro processors and some peripheral interfaces the high speed was obtained by special real time hardware and the parallel processing of multi processors.
The programmable microprocessor and relative independent of each module make the SHPS flexibility the master module using M68000 CPU controls the operation of the various modules and supervises calculates some parameters as well the high speed module of preprocessing is a key module in the front end sub system it performs high speed data processing such as radiometric statistics and calibration rough geometric correction and image enhancement the processed data then send into tape recorder diskette or the back end.
The back end is a general image processing system composed of Micro VAX II computer high resolution color display and some general peripherals the GIPS processed the data come from front end by using of a large image processing software package the GIPS implemented precise geometric correction mosaic and other functions after that the processed data were out put to the tape or returned to the front end.
