Registro automático de imagens SAR interferométricas / Automatic registration of interferometric SAR images
AUTOR(ES)
Roberto Neves Salles
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
31/08/2011
RESUMO
This work presents an automatic registration method for interferometric SAR images. First the SAR images, in complex format, are coarse registered using correlation techniques. This results in range and azimuth shifts on a pixel scale, that are applied on the second image, without need for interpolation. Optionally the azimuth spectral filtering can be applied to the corregistered pair, to enhance the interferometric coherence between them. The second step is the fine registration. By using a grid of small regularly distributed windows over both images, a grid of subpixel shifts is calculated by correlation, from which deformation polynomial equations in range and azimuth are calculated and applied to resample the second image. Spectral range filtering can be optionally applied on the corregistered pair, to enhance interferometric coherence between them. The final registration quality can be measured by analysis of the coherence image and/or by residues method applied to the interferometric phase. The algorithms were implemented in IDL/ENVI and tested on many data.
ASSUNTO(S)
registro insar correlação filtro espectral interferometria insar registration correlation spectral filtering interferometry
