Words similar to drusen
Example sentences for: drusen
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For example, areas of RPE hypopigmentation or frank geographic atrophy with higher reflectance in the green channel could be included in the drusen threshold.
Another application of this method to a drusen image is seen in Fig 4. The first frame is the standardized color image, which then was contrast-enhanced in Photoshop for ease of drusen visualization (middle frame).
In this case, the photograph was of borderline quality due to cataract, and a large pale area within the central subfield was digitally segmented as drusen by one observer (JKC) and left out by the other observer (RTS).
The main practical advantage to our technique is that in leveling the macular background, the same correction is smoothly and simultaneously applied to the drusen embedded within the image, with the dimmer central ones being brightened or enhanced.
This problem persisted in a recent study that relied on applying local thresholds to regions ranging from 20 to 100 pixels square [ 17 ] . Drusen were identified first by checking the local histogram for sufficient skewness (equivalent in this method to determining that drusen were present in the region) and then setting a local threshold.