Fix some approximation issues.

[master-thesis.git] / Parasitemia / ParasitemiaCore / Classifier.fs

diff --git a/Parasitemia/ParasitemiaCore/Classifier.fs b/Parasitemia/ParasitemiaCore/Classifier.fs
index 0bea084..479ba59 100644 (file)
--- a/Parasitemia/ParasitemiaCore/Classifier.fs
+++ b/Parasitemia/ParasitemiaCore/Classifier.fs
@@ -47,24 +47,30 @@ let findCells (ellipses: Ellipse list) (parasites: ParasitesMarker.Result) (img:
 
         // Return 'true' if the point 'p' is owned by e.
         // The lines represents all intersections with other ellipses.
-        let pixelOwnedByE (p: PointD) (e: Ellipse) (others: (Ellipse * Line) list) =
+        let pixelOwnedByE (p: PointF) (e: Ellipse) (others: (Ellipse * Line) list) =
             e.Contains p.X p.Y &&
             seq {
-                let c = PointD(e.Cx, e.Cy)
+                let c = PointF(e.Cx, e.Cy)
+
                 for e', d1 in others do
-                    let d2 = Utils.lineFromTwoPoints c p
-                    let c' = PointD(e'.Cx, e'.Cy)
+                    let d2 = lineFromTwoPoints c p
+                    let c' = PointF(e'.Cx, e'.Cy)
                     let v = pointFromTwoLines d1 (lineFromTwoPoints c c')
                     let case1 = sign (v.X - c.X) <> sign (v.X - c'.X) || Utils.squaredDistanceTwoPoints v c > Utils.squaredDistanceTwoPoints v c'
                     if d2.Valid
                     then
                         let p' = Utils.pointFromTwoLines d1 d2
+                        let delta, delta' =
+                            let d = c.X - p.X
+                            // To avoid rounding.
+                            if abs d < 0.001f then c.Y - p.Y, c.Y - p'.Y else d, c.X - p'.X
+
                         // Yield 'false' when the point is owned by another ellipse.
                         if case1
                         then
-                            yield sign (c.X - p.X) <> sign (c.X - p'.X) || Utils.squaredDistanceTwoPoints c p' > Utils.squaredDistanceTwoPoints c p
+                            yield sign delta <> sign delta' || Utils.squaredDistanceTwoPoints c p' > Utils.squaredDistanceTwoPoints c p
                         else
-                            yield sign (c.X - p.X) = sign (c.X - p'.X) && Utils.squaredDistanceTwoPoints c p' < Utils.squaredDistanceTwoPoints c p
+                            yield sign delta = sign delta' && Utils.squaredDistanceTwoPoints c p' < Utils.squaredDistanceTwoPoints c p
                     else
                         yield case1
             } |> Seq.forall id
@@ -73,7 +79,7 @@ let findCells (ellipses: Ellipse list) (parasites: ParasitesMarker.Result) (img:
 
         // 1) Associate touching ellipses with each ellipses and remove ellipse with more than two intersections.
         let tree = KdTree.Tree.BuildTree ellipses
-        let neighbors (e: EllipseFlaggedKd) : (EllipseFlaggedKd * PointD * PointD) list =
+        let neighbors (e: EllipseFlaggedKd) : (EllipseFlaggedKd * PointF * PointF) list =
             if not e.Removed
             then
                 tree.Search (searchRegion e)
@@ -86,7 +92,7 @@ let findCells (ellipses: Ellipse list) (parasites: ParasitesMarker.Result) (img:
                                 otherE.Removed <- true
                                 None
                             | Some (area, px, py) when area > 0.f && px.Length = 2 ->
-                                Some (otherE, PointD(px.[0], py.[0]), PointD(px.[1], py.[1]))
+                                Some (otherE, PointF(px.[0], py.[0]), PointF(px.[1], py.[1]))
                             | _ ->
                                 None
                         else
@@ -135,7 +141,7 @@ let findCells (ellipses: Ellipse list) (parasites: ParasitesMarker.Result) (img:
                 let mutable area = 0
                 for y in (if minY < 0 then 0 else minY) .. (if maxY >= h then h - 1 else maxY) do
                     for x in (if minX < 0 then 0 else minX) .. (if maxX >= w then w - 1 else maxX) do
-                        let p = PointD(float32 x, float32 y)
+                        let p = PointF(float32 x, float32 y)
                         if pixelOwnedByE p e (neighbors |> List.choose (fun (otherE, p1, p2) -> if otherE.Removed then None else Some (otherE :> Ellipse, Utils.lineFromTwoPoints p1 p2)))
                         then
                             area <- area + 1
@@ -161,7 +167,7 @@ let findCells (ellipses: Ellipse list) (parasites: ParasitesMarker.Result) (img:
                 let elements = new Matrix<byte>(maxY - minY + 1, maxX - minX + 1)
                 for y in minY .. maxY do
                     for x in minX .. maxX do
-                        let p = PointD(float32 x, float32 y)
+                        let p = PointF(float32 x, float32 y)
                         if pixelOwnedByE p e (neighbors |> List.choose (fun (otherE, p1, p2) -> if otherE.Removed then None else Some (otherE :> Ellipse, Utils.lineFromTwoPoints p1 p2)))
                         then
                             elements.[y-minY, x-minX] <- 1uy