+++ /dev/null
-module 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
-