Adaptive Outlier Rejection in Image Super-resolution
| Autor: | Radu Ciprian Bilcu, Jukka Yrjänäinen, Mejdi Trimeche |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Image formation
Finite impulse response Computer science Image quality ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION lcsh:TK7800-8360 lcsh:Telecommunication Least mean squares filter symbols.namesake Robustness (computer science) lcsh:TK5101-6720 Computer vision Electrical and Electronic Engineering Image resolution business.industry lcsh:Electronics Filter (signal processing) Superresolution Adaptive filter Hardware and Architecture Gaussian noise Computer Science::Computer Vision and Pattern Recognition Signal Processing Outlier symbols Artificial intelligence business Digital filter |
| Zdroj: | EURASIP Journal on Advances in Signal Processing, Vol 2006, Iss 1, p 038052 (2006) |
| ISSN: | 1687-6180 |
| DOI: | 10.1155/asp/2006/38052 |
| Popis: | One critical aspect to achieve efficient implementations of image super-resolution is the need for accurate subpixel registration of the input images. The overall performance of super-resolution algorithms is particularly degraded in the presence of persistent outliers, for which registration has failed. To enhance the robustness of processing against this problem, we propose in this paper an integrated adaptive filtering method to reject the outlier image regions. In the process of combining the gradient images due to each low-resolution image, we use adaptive FIR filtering. The coefficients of the FIR filter are updated using the LMS algorithm, which automatically isolates the outlier image regions by decreasing the corresponding coefficients. The adaptation criterion of the LMS estimator is the error between the median of the samples from the LR images and the output of the FIR filter. Through simulated experiments on synthetic images and on real camera images, we show that the proposed technique performs well in the presence of motion outliers. This relatively simple and fast mechanism enables to add robustness in practical implementations of image super-resolution, while still being effective against Gaussian noise in the image formation model. |
| Databáze: | OpenAIRE |
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