Multi-scale adaptive filter for interferometric SAR data
US5488374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1994 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Oct 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/292
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus including a multi-scale adaptive filter for smoothing interferometric SAR (IFSAR) data in areas of low signal-to-noise ratio (SNR) and/or coherence while preserving resolution in areas of high SNR/coherence. The multi-scale adaptive filter uses simple combinations of multiple linear filters applied to a complex interferogram. The multi-scale adaptive filter is computationally efficient and lends itself to parallel implementation. A pyramid architecture comprising a plurality of cascaded stages is employed which reduces the computational load and memory required for implementation of the processing algorithm. The multi-scale adaptive filter implements a processing algorithm that may be applied to standard IFSAR data. Its input is a complex interferogram (the conjugate product of two complex images) and its output is a filtered interferogram (A) which is passed to an information extraction processor, that extracts a terrain elevation map, for example. The adaptive filter incorporates linear filters at two or more scales (i.e. filter impulse response widths) whose outputs are combined in a data-dependent manner. The combination rules result in an output interferogram (A) tha…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.