A High Dynamic Image Stitching Method for Airborne Line Scan Camera

Abstract

The invention discloses a high dynamic image splicing method for an airborne line scanning camera and belongs to the signal processing field. The method comprises steps that firstly, grey transformation of line scanning images acquired by a linear array camera is carried out, an area, which the user is interested in, of the line scanning images is enhanced; secondly, the part, which the user is interested in, of the line scanning images is extracted through a band pass filter; thirdly, the line scanning images are reconstructed, original line scanning images subtract the product of the part ofinterests and a signal displacement coefficient to acquire the result image; and lastly, the line scanning images are spliced to generate an empty matrix with the fixed column number and the fixed row number, two-dimensional matrixes of the images after processing are sequentially imputed to the matrix till a to-be-spliced image is the last line scanning image, and the panorama image is finally acquired. The method is advantaged in that change of light and other factors in the scene can be adapted, the line scanning images acquired under the low illumination can be processed, system robustness is improved, and seam alignment can be guaranteed during alignment of the scanning images.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a high-dynamic image mosaic method for an airborne line-scanning camera. The line-scanning images acquired by the airborne camera are spliced ​​by using the method of signal processing and analysis. Background technique [0002] Airborne camera is an important equipment for aerial survey of aircraft. Its task is to obtain high-resolution target image information from the air in real time, and transmit the information to the control center in real time after processing to complete the acquisition of ground target image. [0003] The aircraft is highly dynamic, and the speed can reach 205m / s. The field of view of the airborne camera is large when shooting, and it requires high precision. The resolution of the line scan camera is super high, and the image acquisition speed is fast, so the current aircraft mostly use the line scan camera to obtain the ground image. As the aircraft mov...

AI Technical Summary

Problems solved by technology

However, changes in air flow, wind direction, and wind speed will cause changes in the attitude roll, pitch, and yaw of the carrier aircraft. The attitude changes of the carrier aircraft directly affect the geometric distortion of the line-scan images and the relative translation between adjacent line-scan images. Therefore, the result of direct line-scan image stitching is not ideal.

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