let h = img.Height
use sobelKernel =
- new Matrix<float32>(
+ new Matrix<float32> (
array2D [[ -1.0f; 0.0f; 1.0f ]
[ -2.0f; 0.0f; 2.0f ]
[ -1.0f; 0.0f; 1.0f ]]
)
- let xGradient = new Matrix<float32>(img.Size)
- let yGradient = new Matrix<float32>(img.Size)
- CvInvoke.Filter2D(img, xGradient, sobelKernel, Point(1, 1))
- CvInvoke.Filter2D(img, yGradient, sobelKernel.Transpose(), Point(1, 1))
+ let xGradient = new Matrix<float32> (img.Size)
+ let yGradient = new Matrix<float32> (img.Size)
+ CvInvoke.Filter2D (img, xGradient, sobelKernel, Point (1, 1))
+ CvInvoke.Filter2D (img, yGradient, sobelKernel.Transpose (), Point (1, 1))
- use magnitudes = new Matrix<float32>(xGradient.Size)
- use angles = new Matrix<float32>(xGradient.Size)
- CvInvoke.CartToPolar(xGradient, yGradient, magnitudes, angles) // Compute the magnitudes and angles. The angles are between 0 and 2 * pi.
+ use magnitudes = new Matrix<float32> (xGradient.Size)
+ use angles = new Matrix<float32> (xGradient.Size)
+ CvInvoke.CartToPolar (xGradient, yGradient, magnitudes, angles) // Compute the magnitudes and angles. The angles are between 0 and 2 * pi.
let thresholdHigh, thresholdLow =
let threshold, _, _ = otsu (histogramMat magnitudes 300)
threshold + (sensibilityHigh * threshold), threshold - (sensibilityLow * threshold)
// Non-maximum suppression.
- use nms = new Matrix<byte>(xGradient.Size)
+ use nms = new Matrix<byte> (xGradient.Size)
let nmsData = nms.Data
let anglesData = angles.Data
// suppressMConnections nms // It's not helpful for the rest of the process (ellipse detection).
- let edges = new Matrix<byte>(xGradient.Size)
+ let edges = new Matrix<byte> (xGradient.Size)
let edgesData = edges.Data
// Hysteresis thresholding.
- let toVisit = Stack<Point>()
+ let toVisit = Stack<Point> ()
for i = 0 to h - 1 do
for j = 0 to w - 1 do
if nmsData.[i, j] = 1uy && magnitudesData.[i, j] >= thresholdHigh then
nmsData.[i, j] <- 0uy
- toVisit.Push(Point(j, i))
+ toVisit.Push (Point (j, i))
while toVisit.Count > 0 do
- let p = toVisit.Pop()
+ let p = toVisit.Pop ()
edgesData.[p.Y, p.X] <- 1uy
for i' = -1 to 1 do
for j' = -1 to 1 do
let nj = p.X + j'
if ni >= 0 && ni < h && nj >= 0 && nj < w && nmsData.[ni, nj] = 1uy then
nmsData.[ni, nj] <- 0uy
- toVisit.Push(Point(nj, ni))
+ toVisit.Push (Point (nj, ni))
edges, xGradient, yGradient
\ No newline at end of file