A Real-Time Airborne Image Mosaic Method Usingthe ARM+DSP Architecture

Combining an embedded system and photogrammetry,this paper proposes a real-time air-borne image mosaic method on an embedded system based on the ARM+DSP system architecture.Characterized by its small volume,low power,and high integration density,an embedded system is avery promising solution for real time airborne photogrammetry problems.In our work,ARM receivesthe image data and DSP processes that data,then ARM saves and displays the result.Data bufferingand memory sharing are used between ARM and DSP,so receiving and processing data can be parallel-ized and exchanging data between ARM and DSP uses little time.Meanwhile,recurrence rectificationand nearest neighbor interpolation methods are used to accelerate the mosaic process.Experimentsshow that the proposed method can generate geo-referenced mosaic images in GSD 5 min 1FPS(frames per second),for Bayer images at a size of 3 027×５　５３０ｐｉｘｅｌｓ　ａｎｄ　ＧＳＤ　２．５ｍ．Ｔｈｅ　ｒｅａｌ－ｔｉｍｅairborne image mosaic method using the ARM+DSP architecture meets the exposure interval require-ment for aerial photogrammetry.