Research Article
Defining the Optimal Region of Interest for Hyperemia Grading in the Bulbar Conjunctiva
Table 2
Implemented hyperemia features.
| | Feature | Name | Formula |
| | Vessel count | | | Vessel occupied area | | | Relative vessel redness | | | Relative image redness | | | Difference red-green in vessels | | | Difference red-green of the image | | | Difference red-blue in vessels | | | Difference red-blue of the image | | | Red hue value | | | Percentage of vessels | | | Percentage of red (RGB) | | | Percentage of red (HSV) | | | Redness with neighbourhood | | | -channel of the image | | | -channel in vessels | | | Yellow in background (RGB) | | | Yellow in background (HSV) | | | Yellow in background | | | Red in background (RGB) | | | Red in background (HSV) | | | Red in background | | | White in background (RGB) | | | White in background (HSV) | | | White in background | |
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