Remote sensing image orthographic correction parallel system based on FPGA

Abstract

The invention discloses a remote sensing image ortho-rectification parallel system based on an FPGA. The data loading module synchronously sends DEM digital elevation model blocks and original imagescorresponding to the blocks to the transmission module / storage chip. The conversion module converts the data stream into an independent image frame and a blocked digital elevation model; the write-inmodule sends the width, the height and the ID number of the current digital elevation model block to the ground coordinate generation module; the ground coordinate generation module generates ground space coordinates X and Y; the elevation interpolation module acquires a digital elevation value Z; the 3D-2D coordinate mapping module is used for acquiring two-dimensional projection coordinates; theimage interpolation module is used for acquiring an ortho-image; setting the resolution of the input original remote sensing image and the output orthoimage to be 1920 * 1080; the working clock frequency of the FPGA processor is 150MHz, and when the on-chip storage resource BRAM in the FPGA is 2MB, one image orthographic correction processing can be finished within 10ms on average, and the calculation efficiency is extremely high.

Description

technical field [0001] The invention relates to the fields of surveying and mapping and geographic space information, in particular to an FPGA-based remote sensing image orthorectification parallel system. Background technique [0002] Since the reform and opening up, my country's economy and urbanization have developed rapidly, and the scale of ecological protection and construction projects is unprecedented. There is an urgent need for high-quality, up-to-date basic geospatial data to achieve scientific construction, management and sustainable development. As one of the important basic geospatial data, the digital orthophoto map DOM has both the geometric accuracy of the map and the image features of rich information. important source of information. DOM is usually generated by using the digital elevation model to perform pixel-by-pixel projection difference correction (digital differential correction), image mosaicking, and frame clipping on aerial / space remote sensing i...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a parallel system for remote sensing image orthorectification based on FPGA, aiming at solving the problem of low processing efficiency in the prior art, which cannot meet the needs of aerospace Technical Problems of Remote Sensing Image Online Processing Requirements

Images