Image processing for aberration removal
Abstract
A nearest neighbors model is proposed for element-to-element coupling distortion in acoustic transducer arrays, and recursive modeling of the point spread function for aberration is used. The resulting system model allows for processing of N measurements simultaneously. It is shown that proper choice of scanning direction in measurement taking is crucial for limiting both the effective signal-to-distortion ratio and the computational complexity in recursive estimation. An order N recursive estimation scheme for the proposed system is presented. On-line recursive image degradation removal is shown to be computationally feasible when filtering and interpolation gains are computed off-line. Examples are given showing successful processing of crosstalk distortion and motion distortion in the presence of noise for focused acoustic imaging systems.
- Publication:
-
7th International Symposium on Acoustical Holography and Imaging
- Pub Date:
- 1977
- Bibcode:
- 1977ahi..symp..225S
- Keywords:
-
- Aberration;
- Acoustical Holography;
- Computer Techniques;
- Image Processing;
- Crosstalk;
- Image Filters;
- Image Resolution;
- Iteration;
- Recursive Functions;
- Transducers;
- Instrumentation and Photography