/// <summary>
/// Remove M-adjacent pixels. It may be used after thinning.
/// </summary>
-let suppressMAdjacency (img: Matrix<byte>) =
+let suppressMAdjacency (img : Matrix<byte>) =
let w = img.Width
let h = img.Height
- for i in 1 .. h - 2 do
- for j in 1 .. w - 2 do
- if img.[i, j] > 0uy && img.Data.[i + 1, j] > 0uy && (img.Data.[i, j - 1] > 0uy && img.Data.[i - 1, j + 1] = 0uy || img.Data.[i, j + 1] > 0uy && img.Data.[i - 1, j - 1] = 0uy)
- then
+ for i = 1 to h - 2 do
+ for j = 1 to w - 2 do
+ if img.[i, j] > 0uy && img.Data.[i + 1, j] > 0uy && (img.Data.[i, j - 1] > 0uy && img.Data.[i - 1, j + 1] = 0uy || img.Data.[i, j + 1] > 0uy && img.Data.[i - 1, j - 1] = 0uy) then
img.[i, j] <- 0uy
- for i in 1 .. h - 2 do
- for j in 1 .. w - 2 do
- if img.[i, j] > 0uy && img.Data.[i - 1, j] > 0uy && (img.Data.[i, j - 1] > 0uy && img.Data.[i + 1, j + 1] = 0uy || img.Data.[i, j + 1] > 0uy && img.Data.[i + 1, j - 1] = 0uy)
- then
+ for i = 1 to h - 2 do
+ for j = 1 to w - 2 do
+ if img.[i, j] > 0uy && img.Data.[i - 1, j] > 0uy && (img.Data.[i, j - 1] > 0uy && img.Data.[i + 1, j + 1] = 0uy || img.Data.[i, j + 1] > 0uy && img.Data.[i + 1, j - 1] = 0uy) then
img.[i, j] <- 0uy
type ExtremumType =
| Maxima = 1
| Minima = 2
-let findExtremum (img: Image<Gray, 'TDepth>) (extremumType: ExtremumType) : IEnumerable<Points> =
+let inline findExtremum (img : Image<Gray, 'TDepth>) (extremumType : ExtremumType) : IEnumerable<Points> when 'TDepth : unmanaged =
let w = img.Width
let h = img.Height
let se = [| -1, 0; 0, -1; 1, 0; 0, 1 |]
let imgData = img.Data
- let suppress: bool[,] = Array2D.zeroCreate h w
+ let suppress : bool[,] = Array2D.zeroCreate h w
- let result = List<List<Point>>()
+ let result = List<List<Point>> ()
- let flood (start: Point) : List<List<Point>> =
- let sameLevelToCheck = Stack<Point>()
- let betterLevelToCheck = Stack<Point>()
- betterLevelToCheck.Push(start)
+ let flood (start
: Point) : List<List<Point>> =
+ let sameLevelToCheck = Stack<Point> ()
+ let betterLevelToCheck = Stack<Point> ()
+ betterLevelToCheck.Push start
- let result' = List<List<Point>>()
+ let result' = List<List<Point>> ()
while betterLevelToCheck.Count > 0 do
- let p = betterLevelToCheck.Pop()
- if not suppress.[p.Y, p.X]
- then
+ let p = betterLevelToCheck.Pop ()
+ if not suppress.[p.Y, p.X] then
suppress.[p.Y, p.X] <- true
- sameLevelToCheck.Push(p)
- let current = List<Point>()
+ sameLevelToCheck.Push p
+ let current = List<Point> ()
let mutable betterExists = false
while sameLevelToCheck.Count > 0 do
- let p' = sameLevelToCheck.Pop()
+ let p' = sameLevelToCheck.Pop ()
let currentLevel = imgData.[p'.Y, p'.X, 0]
- current.Add(p') |> ignore
+ current.Add p' |> ignore
for i, j in se do
let ni = i + p'.Y
let nj = j + p'.X
- if ni >= 0 && ni < h && nj >= 0 && nj < w
- then
+ if ni >= 0 && ni < h && nj >= 0 && nj < w then
let level = imgData.[ni, nj, 0]
let notSuppressed = not suppress.[ni, nj]
- if level = currentLevel && notSuppressed
- then
+ if notSuppressed && level = currentLevel then
suppress.[ni, nj] <- true
- sameLevelToCheck.Push(Point(nj, ni))
- elif if extremumType = ExtremumType.Maxima then level > currentLevel else level < currentLevel
- then
+ sameLevelToCheck.Push (Point (nj, ni))
+ elif (if extremumType = ExtremumType.Maxima then level > currentLevel else level < currentLevel) then
betterExists <- true
- if notSuppressed
- then
- betterLevelToCheck.Push(Point(nj, ni))
+ if notSuppressed then
+ betterLevelToCheck.Push (Point (nj, ni))
- if not betterExists
- then
- result'.Add(current)
+ if not betterExists then
+ result'.Add current
result'
- for i in 0 .. h - 1 do
- for j in 0 .. w - 1 do
- let maxima = flood (Point(j, i))
- if maxima.Count > 0
- then
- result.AddRange(maxima)
+ for i = 0 to h - 1 do
+ for j = 0 to w - 1 do
+ let maxima = flood (Point (j, i))
+ if maxima.Count > 0 then
+ result.AddRange maxima
- result.Select(fun l -> Points(l))
+ result.Select (fun l -> Points l)
-let findMaxima (img: Image<Gray, 'TDepth>) : IEnumerable<Points> =
+let inline findMaxima (img : Image<Gray, 'TDepth>) : IEnumerable<Points> when 'TDepth : unmanaged =
findExtremum img ExtremumType.Maxima
-let findMinima (img: Image<Gray, 'TDepth>) : IEnumerable<Points> =
+let inline findMinima (img : Image<Gray, 'TDepth>) : IEnumerable<Points> when 'TDepth : unmanaged =
findExtremum img ExtremumType.Minima
type PriorityQueue () =
let size = 256
- let q: Points[] = Array.init size (fun i -> Points())
+ let q : Points[] = Array.init size (fun i -> Points ())
let mutable highest = -1 // Value of the first elements of 'q'.
let mutable lowest = size
member this.NextMax () : byte * Point =
- if this.IsEmpty
- then
+ if this.IsEmpty then
invalidOp "Queue is empty"
else
let l = q.[highest]
- let next = l.First()
- l.Remove(next) |> ignore
+ let next = l.First ()
+ l.Remove next |> ignore
let value = byte highest
- if l.Count = 0
- then
+ if l.Count = 0 then
highest <- highest - 1
while highest > lowest && q.[highest].Count = 0 do
highest <- highest - 1
- if highest = lowest
- then
+ if highest = lowest then
highest <- -1
lowest <- size
value, next
member this.NextMin () : byte * Point =
- if this.IsEmpty
- then
+ if this.IsEmpty then
invalidOp "Queue is empty"
else
let l = q.[lowest + 1]
- let next = l.First()
- l.Remove(next) |> ignore
+ let next = l.First ()
+ l.Remove next |> ignore
let value = byte (lowest + 1)
- if l.Count = 0
- then
+ if l.Count = 0 then
lowest <- lowest + 1
while lowest < highest && q.[lowest + 1].Count = 0 do
lowest <- lowest + 1
- if highest = lowest
- then
+ if highest = lowest then
highest <- -1
lowest <- size
member this.Min =
lowest + 1 |> byte
- member this.Add (value: byte) (p: Point) =
+ member this.Add (value : byte) (p : Point) =
let vi = int value
- if vi > highest
- then
+ if vi > highest then
highest <- vi
- if vi <= lowest
- then
+ if vi <= lowest then
lowest <- vi - 1
- q.[vi].Add(p) |> ignore
+ q.[vi].Add p |> ignore
- member this.Remove (value: byte) (p: Point) =
+ member this.Remove (value : byte) (p : Point) =
let vi = int value
- if q.[vi].Remove(p) && q.[vi].Count = 0
- then
- if vi = highest
- then
+ if q.[vi].Remove p && q.[vi].Count = 0 then
+ if vi = highest then
highest <- highest - 1
while highest > lowest && q.[highest].Count = 0 do
highest <- highest - 1
- elif vi - 1 = lowest
- then
+ elif vi - 1 = lowest then
lowest <- lowest + 1
while lowest < highest && q.[lowest + 1].Count = 0 do
lowest <- lowest + 1
- if highest = lowest // The queue is now empty.
- then
+ if highest = lowest then // The queue is now empty.
highest <- -1
lowest <- size
member this.Clear () =
while highest > lowest do
- q.[highest].Clear()
+ q.[highest].Clear ()
highest <- highest - 1
highest <- -1
lowest <- size
| Closing = 2
[<AllowNullLiteral>]
-type private Area (elements: Points) =
+type private Area (elements : Points) =
member this.Elements = elements
member val Intensity = None with get, set
member val State = AreaState.Unprocessed with get, set
-let private areaOperation (img: Image<Gray, byte>) (area: int) (op: AreaOperation) =
+let private areaOperation (img : Image<Gray, byte>) (area : int) (op : AreaOperation) =
let w = img.Width
let h = img.Height
let imgData = img.Data
let se = [| -1, 0; 0, -1; 1, 0; 0, 1 |]
- let areas = List<Area>((if op = AreaOperation.Opening then findMaxima img else findMinima img) |> Seq.map Area)
+ let areas = List<Area> ((if op = AreaOperation.Opening then findMaxima img else findMinima img) |> Seq.map Area)
- let pixels: Area[,] = Array2D.create h w null
+ let pixels : Area[,] = Array2D.create h w null
for m in areas do
for e in m.Elements do
pixels.[e.Y, e.X] <- m
- let queue = PriorityQueue()
+ let queue = PriorityQueue ()
- let addEdgeToQueue (elements: Points) =
+ let addEdgeToQueue (elements : Points) =
for p in elements do
for i, j in se do
let ni = i + p.Y
let nj = j + p.X
- let p' = Point(nj, ni)
- if ni >= 0 && ni < h && nj >= 0 && nj < w && not (elements.Contains(p'))
- then
+ let p' = Point (nj, ni)
+ if ni >= 0 && ni < h && nj >= 0 && nj < w && not (elements.Contains p') then
queue.Add (imgData.[ni, nj, 0]) p'
// Reverse order is quicker.
- for i in areas.Count - 1 .. -1 .. 0 do
+ for i = areas.Count - 1 downto 0 do
let m = areas.[i]
- if m.Elements.Count <= area && m.State <> AreaState.Removed
- then
- queue.Clear()
+ if m.Elements.Count <= area && m.State <> AreaState.Removed then
+ queue.Clear ()
addEdgeToQueue m.Elements
let mutable intensity = if op = AreaOperation.Opening then queue.Max else queue.Min
- let nextElements = Points()
+ let nextElements = Points ()
let mutable stop = false
while not stop do
let intensity', p = if op = AreaOperation.Opening then queue.NextMax () else queue.NextMin ()
let mutable merged = false
- if intensity' = intensity // The intensity doesn't change.
- then
- if m.Elements.Count + nextElements.Count + 1 > area
- then
+ if intensity' = intensity then // The intensity doesn't change.
+ if m.Elements.Count + nextElements.Count + 1 > area then
m.State <- AreaState.Validated
m.Intensity <- Some intensity
stop <- true
else
- nextElements.Add(p) |> ignore
+ nextElements.Add p |> ignore
- elif if op = AreaOperation.Opening then intensity' < intensity else intensity' > intensity
- then
- m.Elements.UnionWith(nextElements)
+ elif (if op = AreaOperation.Opening then intensity' < intensity else intensity' > intensity) then
+ m.Elements.UnionWith nextElements
for e in nextElements do
pixels.[e.Y, e.X] <- m
- if m.Elements.Count = area
- then
+ if m.Elements.Count = area then
m.State <- AreaState.Validated
m.Intensity <- Some (intensity')
stop <- true
else
intensity <- intensity'
- nextElements.Clear()
- nextElements.Add(p) |> ignore
+ nextElements.Clear ()
+ nextElements.Add p |> ignore
else
match pixels.[p.Y, p.X] with
| null -> ()
| m' ->
- if m'.Elements.Count + m.Elements.Count <= area
- then
+ if m'.Elements.Count + m.Elements.Count <= area then
m'.State <- AreaState.Removed
for e in m'.Elements do
pixels.[e.Y, e.X] <- m
queue.Remove imgData.[e.Y, e.X, 0] e
addEdgeToQueue m'.Elements
- m.Elements.UnionWith(m'.Elements)
+ m.Elements.UnionWith m'.Elements
let intensityMax = if op = AreaOperation.Opening then queue.Max else queue.Min
- if intensityMax <> intensity
- then
+ if intensityMax <> intensity then
intensity <- intensityMax
- nextElements.Clear()
+ nextElements.Clear ()
merged <- true
- if not merged
- then
+ if not merged then
m.State <- AreaState.Validated
m.Intensity <- Some (intensity)
stop <- true
- if not stop && not merged
- then
+ if not stop && not merged then
for i, j in se do
let ni = i + p.Y
let nj = j + p.X
- let p' = Point(nj, ni)
- if ni < 0 || ni >= h || nj < 0 || nj >= w
- then
+ let p' = Point (nj, ni)
+ if ni < 0 || ni >= h || nj < 0 || nj >= w then
m.State <- AreaState.Validated
m.Intensity <- Some (intensity)
stop <- true
- elif not (m.Elements.Contains(p')) && not (nextElements.Contains(p'))
- then
+ elif not (m.Elements.Contains p') && not (nextElements.Contains p') then
queue.Add (imgData.[ni, nj, 0]) p'
- if queue.IsEmpty
- then
- if m.Elements.Count + nextElements.Count <= area
- then
+ if queue.IsEmpty then
+ if m.Elements.Count + nextElements.Count <= area then
m.State <- AreaState.Validated
m.Intensity <- Some intensity'
- m.Elements.UnionWith(nextElements)
+ m.Elements.UnionWith nextElements
stop <- true
for m in areas do
- if m.State = AreaState.Validated
- then
+ if m.State = AreaState.Validated then
match m.Intensity with
| Some i ->
for p in m.Elements do
/// <summary>
/// Area opening on byte image.
/// </summary>
-let areaOpen (img: Image<Gray, byte>) (area: int) =
+let areaOpen (img : Image<Gray, byte>) (area : int) =
areaOperation img area AreaOperation.Opening
/// <summary>
/// Area closing on byte image.
/// </summary>
-let areaClose (img: Image<Gray, byte>) (area: int) =
+let areaClose (img : Image<Gray, byte>) (area : int) =
areaOperation img area AreaOperation.Closing
// A simpler algorithm than 'areaOpen' on byte image but slower.
-let areaOpen2 (img: Image<Gray, byte>) (area: int) =
+let areaOpen2 (img : Image<Gray, byte>) (area : int) =
let w = img.Width
let h = img.Height
let imgData = img.Data
let se = [| -1, 0; 0, -1; 1, 0; 0, 1 |]
let histogram = Array.zeroCreate 256
- for i in 0 .. h - 1 do
- for j in 0 .. w - 1 do
+ for i = 0 to h - 1 do
+ for j = 0 to w - 1 do
let v = imgData.[i, j, 0] |> int
histogram.[v] <- histogram.[v] + 1
let flooded : bool[,] = Array2D.zeroCreate h w
- let pointsChecked = HashSet<Point>()
- let pointsToCheck = Stack<Point>()
+ let pointsChecked = HashSet<Point> ()
+ let pointsToCheck = Stack<Point> ()
- for level in 255 .. -1 .. 0 do
+ for level = 255 downto 0 do
let mutable n = histogram.[level]
- if n > 0
- then
- for i in 0 .. h - 1 do
- for j in 0 .. w - 1 do
- if not flooded.[i, j] && imgData.[i, j, 0] = byte level
- then
+ if n > 0 then
+ for i = 0 to h - 1 do
+ for j = 0 to w - 1 do
+ if not flooded.[i, j] && imgData.[i, j, 0] = byte level then
let mutable maxNeighborValue = 0uy
- pointsChecked.Clear()
- pointsToCheck.Clear()
- pointsToCheck.Push(Point(j, i))
+ pointsChecked.Clear ()
+ pointsToCheck.Clear ()
+ pointsToCheck.Push (Point (j, i))
while pointsToCheck.Count > 0 do
- let next = pointsToCheck.Pop()
- pointsChecked.Add(next) |> ignore
+ let next = pointsToCheck.Pop ()
+ pointsChecked.Add next |> ignore
flooded.[next.Y, next.X] <- true
for nx, ny in se do
- let p = Point(next.X + nx, next.Y + ny)
- if p.X >= 0 && p.X < w && p.Y >= 0 && p.Y < h
- then
+ let p = Point (next.X + nx, next.Y + ny)
+ if p.X >= 0 && p.X < w && p.Y >= 0 && p.Y < h then
let v = imgData.[p.Y, p.X, 0]
- if v = byte level
- then
- if not (pointsChecked.Contains(p))
- then
- pointsToCheck.Push(p)
- elif v > maxNeighborValue
- then
+ if v = byte level then
+ if not (pointsChecked.Contains p) then
+ pointsToCheck.Push p
+ elif v > maxNeighborValue then
maxNeighborValue <- v
- if int maxNeighborValue < level && pointsChecked.Count <= area
- then
+ if int maxNeighborValue < level && pointsChecked.Count <= area then
for p in pointsChecked do
imgData.[p.Y, p.X, 0] <- maxNeighborValue
[<AllowNullLiteral>]
-type Island (cmp: IComparer<float32>) =
- member val Shore = Heap.Heap<float32, Point>(cmp) with get
+type Island (cmp : IComparer<float32>) =
+ member val Shore = Heap.Heap<float32, Point> cmp with get
member val Level = 0.f with get, set
member val Surface = 0 with get, set
member this.IsInfinite = this.Surface = Int32.MaxValue
-let private areaOperationF (img: Image<Gray, float32>) (areas: (int * 'a) list) (f: ('a -> float32 -> unit) option) (op: AreaOperation) =
+let private areaOperationF (img : Image<Gray, float32>) (areas : (int * 'a) list) (f : ('a -> float32 -> unit) option) (op : AreaOperation) =
let w = img.Width
let h = img.Height
let earth = img.Data
let se = [| -1, 0; 0, -1; 1, 0; 0, 1 |]
- let comparer = if op = AreaOperation.Opening
- then { new IComparer<float32> with member this.Compare(v1, v2) = v1.CompareTo(v2) }
- else { new IComparer<float32> with member this.Compare(v1, v2) = v2.CompareTo(v1) }
+ let comparer =
+ if op = AreaOperation.Opening then
+ { new IComparer<float32> with member this.Compare (v1, v2) = v1.CompareTo v2 }
+ else
+ { new IComparer<float32> with member this.Compare (v1, v2) = v2.CompareTo v1 }
- let ownership: Island[,] = Array2D.create h w null
+ let ownership : Island[,] = Array2D.create h w null
// Initialize islands with their shore.
- let islands = List<Island>()
+ let islands = List<Island> ()
let extremum = img |> if op = AreaOperation.Opening then findMaxima else findMinima
for e in extremum do
let island =
- let p = e.First()
- Island(comparer, Level = earth.[p.Y, p.X, 0], Surface = e.Count)
- islands.Add(island)
- let shorePoints = Points()
+ let p = e.First ()
+ Island (comparer, Level = earth.[p.Y, p.X, 0], Surface = e.Count)
+ islands.Add island
+ let shorePoints = Points ()
for p in e do
ownership.[p.Y, p.X] <- island
for i, j in se do
let ni = i + p.Y
let nj = j + p.X
- let neighbor = Point(nj, ni)
- if ni >= 0 && ni < h && nj >= 0 && nj < w && Object.ReferenceEquals(ownership.[ni, nj], null) && not (shorePoints.Contains(neighbor))
- then
- shorePoints.Add(neighbor) |> ignore
+ let neighbor = Point (nj, ni)
+ if ni >= 0 && ni < h && nj >= 0 && nj < w && Object.ReferenceEquals (ownership.[ni, nj], null) && not (shorePoints.Contains neighbor) then
+ shorePoints.Add neighbor |> ignore
island.Shore.Add earth.[ni, nj, 0] neighbor
for area, obj in areas do
let mutable stop = island.Shore.IsEmpty
// 'true' if 'p' is owned or adjacent to 'island'.
- let inline ownedOrAdjacent (p: Point) : bool =
+ let inline ownedOrAdjacent (p : Point) : bool =
ownership.[p.Y, p.X] = island ||
(p.Y > 0 && ownership.[p.Y - 1, p.X] = island) ||
(p.Y < h - 1 && ownership.[p.Y + 1, p.X] = island) ||
while not stop && island.Surface < area do
let level, next = island.Shore.Max
let other = ownership.[next.Y, next.X]
- if other = island // During merging, some points on the shore may be owned by the island itself -> ignored.
- then
+ if other = island then // During merging, some points on the shore may be owned by the island itself -> ignored.
island.Shore.RemoveNext ()
else
- if not <| Object.ReferenceEquals(other, null)
- then // We touching another island.
- if island.IsInfinite || other.IsInfinite || island.Surface + other.Surface >= area || comparer.Compare(island.Level, other.Level) < 0
- then
+ if not <| Object.ReferenceEquals (other, null) then
+ // We touching another island.
+ if island.IsInfinite || other.IsInfinite || island.Surface + other.Surface >= area || comparer.Compare (island.Level, other.Level) < 0 then
stop <- true
else // We can merge 'other' into 'surface'.
island.Surface <- island.Surface + other.Surface
island.Level <- other.Level
- // island.Level <- if comparer.Compare(island.Level, other.Level) > 0 then other.Level else island.Level
for l, p in other.Shore do
let mutable currentY = p.Y + 1
while currentY < h && ownership.[currentY, p.X] = other do
ownership.[currentY, p.X] <- island
currentY <- currentY + 1
island.Shore.Add l p
- other.Shore.Clear()
+ other.Shore.Clear ()
- elif comparer.Compare(level, island.Level) > 0
- then
+ elif comparer.Compare (level, island.Level) > 0 then
stop <- true
else
island.Shore.RemoveNext ()
for i, j in se do
let ni = i + next.Y
let nj = j + next.X
- if ni < 0 || ni >= h || nj < 0 || nj >= w
- then
+ if ni < 0 || ni >= h || nj < 0 || nj >= w then
island.Surface <- Int32.MaxValue
stop <- true
else
- let neighbor = Point(nj, ni)
- if not <| ownedOrAdjacent neighbor
- then
+ let neighbor = Point (nj, ni)
+ if not <| ownedOrAdjacent neighbor then
island.Shore.Add earth.[ni, nj, 0] neighbor
- if not stop
- then
+ if not stop then
ownership.[next.Y, next.X] <- island
island.Level <- level
island.Surface <- island.Surface + 1
let mutable diff = 0.f
- for i in 0 .. h - 1 do
- for j in 0 .. w - 1 do
+ for i = 0 to h - 1 do
+ for j = 0 to w - 1 do
match ownership.[i, j] with
| null -> ()
| island ->
/// <summary>
/// Area opening on float image.
/// </summary>
-let areaOpenF (img: Image<Gray, float32>) (area: int) =
+let areaOpenF (img : Image<Gray, float32>) (area : int) =
areaOperationF img [ area, () ] None AreaOperation.Opening
/// <summary>
/// Area closing on float image.
/// </summary>
-let areaCloseF (img: Image<Gray, float32>) (area: int) =
+let areaCloseF (img : Image<Gray, float32>) (area : int) =
areaOperationF img [ area, () ] None AreaOperation.Closing
/// <summary>
/// For each area the function 'f' is called with the associated area value of type 'a and the volume difference
/// Between the previous and the current closing.
/// </summary>
-let areaOpenFWithFun (img: Image<Gray, float32>) (areas: (int * 'a) list) (f: 'a -> float32 -> unit) =
+let areaOpenFWithFun (img : Image<Gray, float32>) (areas : (int * 'a) list) (f : 'a -> float32 -> unit) =
areaOperationF img areas (Some f) AreaOperation.Opening
/// <summary>
/// Same as 'areaOpenFWithFun' for closing operation.
/// </summary>
-let areaCloseFWithFun (img: Image<Gray, float32>) (areas: (int * 'a) list) (f: 'a -> float32 -> unit) =
+let areaCloseFWithFun (img : Image<Gray, float32>) (areas : (int * 'a) list) (f : 'a -> float32 -> unit) =
areaOperationF img areas (Some f) AreaOperation.Closing
/// <summary>
/// Zhang and Suen thinning algorithm.
/// Modify 'mat' in place.
/// </summary>
-let thin (mat: Matrix<byte>) =
+let thin (mat : Matrix<byte>) =
let w = mat.Width
let h = mat.Height
let mutable data1 = mat.Data
while pixelChanged do
pixelChanged <- false
- for i in 0..h-1 do
- for j in 0..w-1 do
- if data1.[i, j] = 1uy
- then
+ for i = 0 to h - 1 do
+ for j = 0 to w - 1 do
+ if data1.[i, j] = 1uy then
let p2 = if i = 0 then 0uy else data1.[i-1, j]
let p3 = if i = 0 || j = w-1 then 0uy else data1.[i-1, j+1]
let p4 = if j = w-1 then 0uy else data1.[i, j+1]
(if p7 = 0uy && p8 = 1uy then 1 else 0) +
(if p8 = 0uy && p9 = 1uy then 1 else 0) +
(if p9 = 0uy && p2 = 1uy then 1 else 0) = 1 &&
- if oddIteration
- then p2 * p4 * p6 = 0uy && p4 * p6 * p8 = 0uy
- else p2 * p4 * p8 = 0uy && p2 * p6 * p8 = 0uy
+ if oddIteration then
+ p2 * p4 * p6 = 0uy && p4 * p6 * p8 = 0uy
+ else
+ p2 * p4 * p8 = 0uy && p2 * p6 * p8 = 0uy
then
data2.[i, j] <- 0uy
pixelChanged <- true
/// Remove all 8-connected pixels with an area equal or greater than 'areaSize'.
/// Modify 'mat' in place.
/// </summary>
-let removeArea (mat: Matrix<byte>) (areaSize: int) =
+let removeArea (mat : Matrix<byte>) (areaSize : int) =
let neighbors = [|
(-1, 0) // p2
(-1, 1) // p3
( 0, -1) // p8
(-1, -1) |] // p9
- use mat' = new Matrix<byte>(mat.Size)
+ use mat' = new Matrix<byte> (mat.Size)
let w = mat'.Width
let h = mat'.Height
- mat.CopyTo(mat')
+ mat.CopyTo mat'
let data = mat.Data
let data' = mat'.Data
- for i in 0..h-1 do
- for j in 0..w-1 do
- if data'.[i, j] = 1uy
- then
- let neighborhood = List<Point>()
- let neighborsToCheck = Stack<Point>()
- neighborsToCheck.Push(Point(j, i))
+ for i = 0 to h - 1 do
+ for j = 0 to w - 1 do
+ if data'.[i, j] = 1uy then
+ let neighborhood = List<Point> ()
+ let neighborsToCheck = Stack<Point> ()
+ neighborsToCheck.Push (Point (j, i))
data'.[i, j] <- 0uy
while neighborsToCheck.Count > 0 do
- let n = neighborsToCheck.Pop()
- neighborhood.Add(n)
+ let n = neighborsToCheck.Pop ()
+ neighborhood.Add n
for (ni, nj) in neighbors do
let pi = n.Y + ni
let pj = n.X + nj
- if pi >= 0 && pi < h && pj >= 0 && pj < w && data'.[pi, pj] = 1uy
- then
- neighborsToCheck.Push(Point(pj, pi))
+ if pi >= 0 && pi < h && pj >= 0 && pj < w && data'.[pi, pj] = 1uy then
+ neighborsToCheck.Push (Point (pj, pi))
data'.[pi, pj] <- 0uy
- if neighborhood.Count <= areaSize
- then
+ if neighborhood.Count <= areaSize then
for n in neighborhood do
data.[n.Y, n.X] <- 0uy
-let connectedComponents (img
: Image<Gray, byte>) (startPoints: List<Point>) : Points =
+let connectedComponents (img
: Image<Gray, byte>) (startPoints : List<Point>) : Points =
let w = img.Width
let h = img.Height
- let pointChecked = Points()
- let pointToCheck = Stack<Point>(startPoints);
+ let pointChecked = Points ()
+ let pointToCheck = Stack<Point> startPoints;
let data = img.Data
while pointToCheck.Count > 0 do
- let next = pointToCheck.Pop()
- pointChecked.Add(next) |> ignore
- for ny in -1 .. 1 do
- for nx in -1 .. 1 do
- if ny <> 0 && nx <> 0
- then
- let p = Point(next.X + nx, next.Y + ny)
- if p.X >= 0 && p.X < w && p.Y >= 0 && p.Y < h && data.[p.Y, p.X, 0] > 0uy && not (pointChecked.Contains p)
- then
- pointToCheck.Push(p)
+ let next = pointToCheck.Pop ()
+ pointChecked.Add next |> ignore
+ for ny = -1 to 1 do
+ for nx = -1 to 1 do
+ if ny <> 0 && nx <> 0 then
+ let p = Point (next.X + nx, next.Y + ny)
+ if p.X >= 0 && p.X < w && p.Y >= 0 && p.Y < h && data.[p.Y, p.X, 0] > 0uy && not (pointChecked.Contains p) then
+ pointToCheck.Push p
pointChecked
projects / master-thesis.git / blobdiff