Fig. 5.

The layer double-line model (layer DLM). The layer DLM consists of two parallel lines AB (outer edge) and CD (inner edge), which can be adjusted to detect a tissue layer. (a) DLM parameters that define the DLM state : width, $w_m$; length, $l_m$; position, ${\mathbf{p}}_m$; and direction, ${\mathbf{t}}_m$. (b) Regions of the layer DLM: the DLM is divided into an internal region, $R_{mi}$, which is in turn subdivided into two subregions, $R_{mh}$ and $R_{ml}$; and two external regions, $R_{bo}$ and $R_{bi}$. These regions are used to calculate foreground and background intensity levels from OCT images.