Figure 6
![Figure 6](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1475-925X-10-26/MediaObjects/12938_2010_Article_438_Fig6_HTML.jpg)
Three images with different contrast degradations. A. The raw image. B. A 70% contrast degraded image. C. A 50% contrast degraded image.
Three images with different contrast degradations. A. The raw image. B. A 70% contrast degraded image. C. A 50% contrast degraded image.