--- /dev/null
+module ParasitemiaCore.Granulometry
+
+open System
+open System.Drawing
+
+open Emgu.CV
+open Emgu.CV.Structure
+
+open Utils
+
+// 'range': a minimum and maximum radius.
+// 'scale': <= 1.0, to speed up the process.
+let findRadiusByClosing (img: Image<Gray, 'TDepth>) (range: int * int) (scale: float) : int =
+ use scaledImg = if scale = 1. then img else img.Resize(scale, CvEnum.Inter.Area)
+
+ let r1, r2 = range
+ let r1', r2' = roundInt (float r1 * scale), roundInt (float r2 * scale)
+
+ let patternSpectrum = Array.zeroCreate (r2' - r1')
+ let intensityImg = scaledImg.GetSum().Intensity
+
+ // 's' must be odd.
+ let octagon (s: int) : Matrix<byte> =
+ if s % 2 = 0 then failwith "s must be odd"
+ let m = new Matrix<byte>(Array2D.create s s 1uy)
+ let r = (float s) / (Math.Sqrt 2. + 2.) |> roundInt
+ for i in 0 .. r - 1 do
+ for j in 0 .. r - 1 do
+ if i + j < r
+ then
+ m.[i, j] <- 0uy
+ m.[s - i - 1, j] <- 0uy
+ m.[i, s - j - 1] <- 0uy
+ m.[s - i - 1, s - j - 1] <- 0uy
+ m
+
+ let mutable previous_n = Double.NaN
+ for r in r1' .. r2' do
+ let se = CvInvoke.GetStructuringElement(CvEnum.ElementShape.Ellipse, Size(2 * r, 2 * r), Point(-1, -1))
+ //let se = octagon (2 * r - 1)
+
+ use closed = scaledImg.MorphologyEx(CvEnum.MorphOp.Close, se, Point(-1, -1), 1, CvEnum.BorderType.Replicate, MCvScalar(0.0))
+
+ let n = closed.GetSum().Intensity
+
+ if not (Double.IsNaN previous_n)
+ then
+ patternSpectrum.[r - r1' - 1] <- abs (n - previous_n)
+ previous_n <- n
+
+ let max, _ = patternSpectrum |> Array.indexed |> Array.fold (fun (iMax, sMax) (i, s) -> if s > sMax then (i, s) else (iMax, sMax)) (0, Double.MinValue)
+
+ float (max + r1') / scale |> roundInt
+
+let findRadiusByAreaClosing (img: Image<Gray, float32>) (range: int * int) : int =
+ let r1, r2 = range
+
+ use imgCopy = img.Copy()
+
+ let mutable maxDiff = 0.f
+ let mutable max_r = r1
+
+ ImgTools.areaCloseFWithFun imgCopy [ for r in r1 .. r2 -> Math.PI * float r ** 2. |> roundInt, r ] (fun r diff ->
+ if r <> r1 && diff > maxDiff
+ then
+ maxDiff <- diff
+ max_r <- r - 1 )
+ max_r
+