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/*
* GNU AFFERO GENERAL PUBLIC LICENSE
* Version 3, 19 November 2007
* Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
* Everyone is permitted to copy and distribute verbatim copies
* of this license document, but changing it is not allowed.
*/
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using Emgu.CV.Util;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace UVtools.Core.Extensions
{
public static class EmguExtensions
{
public static readonly MCvScalar WhiteColor = new(255, 255, 255, 255);
public static readonly MCvScalar BlackColor = new(0, 0, 0, 255);
//public static readonly MCvScalar TransparentColor = new();
public static unsafe byte* GetBytePointer(this Mat mat)
{
return (byte*)mat.DataPointer.ToPointer();
}
/// <summary>
/// Gets a single pixel span to manipulate or read pixels
/// </summary>
/// <typeparam name="T">Pixel type</typeparam>
/// <param name="mat"><see cref="Mat"/> Input</param>
/// <returns>A <see cref="Span{T}"/> containing all pixels in data memory</returns>
public static unsafe Span<T> GetPixelSpan<T>(this Mat mat)
{
return new(mat.DataPointer.ToPointer(), mat.GetLength());
}
public static unsafe Span<byte> GetPixelSpanByte(this Mat mat)
{
return new(mat.DataPointer.ToPointer(), mat.GetLength());
}
public static unsafe Span<T> GetPixelSpan<T>(this Mat mat, int length, int offset = 0)
{
return new(IntPtr.Add(mat.DataPointer, offset).ToPointer(), length);
}
public static Span<T> GetSinglePixelSpan<T>(this Mat mat, int x, int y)
{
return mat.GetPixelSpan<T>(mat.NumberOfChannels, mat.GetPixelPos(x, y));
}
public static Span<T> GetSinglePixelSpan<T>(this Mat mat, int pos)
{
return mat.GetPixelSpan<T>(mat.NumberOfChannels, pos);
}
public static unsafe Span<T> GetPixelRowSpan<T>(this Mat mat, int y, int length = 0, int offset = 0)
{
return new(IntPtr.Add(mat.DataPointer, y * mat.Step + offset).ToPointer(), length <= 0 ? mat.Step : length);
//return mat.GetPixelSpan<T>().Slice(offset, mat.Step);
}
public static unsafe Span<T> GetPixelColSpan<T>(this Mat mat, int x, int length = 0, int offset = 0)
{
var colMat = mat.Col(x);
return new(IntPtr.Add(colMat.DataPointer, offset).ToPointer(), length <= 0 ? mat.Height : length);
}
/// <summary>
/// Gets if a <see cref="Mat"/> is all zeroed
/// </summary>
/// <param name="mat"></param>
/// <param name="threshold">Pixel brightness threshold</param>
/// <returns></returns>
public static unsafe bool IsZeroed(this Mat mat, byte threshold = 0)
{
var ptr = mat.GetBytePointer();
for (int i = 0; i < mat.GetLength(); i++)
{
if (ptr[i] > threshold) return false;
}
return true;
}
public static void Transform(this Mat src, double xScale, double yScale, double xTrans = 0, double yTrans = 0, Size dstSize = default, Inter interpolation = Inter.Linear)
{
//var dst = new Mat(src.Size, src.Depth, src.NumberOfChannels);
using var translateTransform = new Matrix<double>(2, 3)
{
[0, 0] = xScale, // xScale
[1, 1] = yScale, // yScale
[0, 2] = xTrans, //x translation + compensation of x scaling
[1, 2] = yTrans // y translation + compensation of y scaling
};
CvInvoke.WarpAffine(src, src, translateTransform, dstSize.IsEmpty ? src.Size : dstSize, interpolation);
}
/// <summary>
/// Rotates a Mat by an angle while keeping the image size
/// </summary>
/// <param name="src"></param>
/// <param name="angle"></param>
/// <param name="scale"></param>
public static void Rotate(this Mat src, double angle, Size newSize = default, double scale = 1.0) => Rotate(src, src, angle, newSize, scale);
/// <summary>
/// Rotates a Mat by an angle while keeping the image size
/// </summary>
/// <param name="src"></param>
/// <param name="dst"></param>
/// <param name="angle"></param>
/// <param name="scale"></param>
public static void Rotate(this Mat src, Mat dst, double angle, Size newSize = default, double scale = 1.0)
{
if (angle % 360 == 0 && scale == 1.0) return;
if (newSize.IsEmpty)
{
newSize = src.Size;
}
var halfWidth = src.Width / 2.0f;
var halfHeight = src.Height / 2.0f;
using var translateTransform = new Matrix<double>(2, 3);
CvInvoke.GetRotationMatrix2D(new PointF(halfWidth, halfHeight), -angle, scale, translateTransform);
if (src.Size != newSize)
{
// adjust the rotation matrix to take into account translation
translateTransform[0, 2] += newSize.Width / 2.0 - halfWidth;
translateTransform[1, 2] += newSize.Height / 2.0 - halfHeight;
}
CvInvoke.WarpAffine(src, dst, translateTransform, newSize);
}
/// <summary>
/// Rotates a Mat by an angle while adjusting bounds to fit the rotated content
/// </summary>
/// <param name="src"></param>
/// <param name="angle"></param>
/// <param name="scale"></param>
public static void RotateAdjustBounds(this Mat src, double angle, double scale = 1.0) => RotateAdjustBounds(src, src, angle, scale);
/// <summary>
/// Rotates a Mat by an angle while adjusting bounds to fit the rotated content
/// </summary>
/// <param name="src"></param>
/// <param name="dst"></param>
/// <param name="angle"></param>
/// <param name="scale"></param>
public static void RotateAdjustBounds(this Mat src, Mat dst, double angle, double scale = 1.0)
{
if (angle % 360 == 0 && scale == 1.0) return;
var halfWidth = src.Width / 2.0f;
var halfHeight = src.Height / 2.0f;
using var translateTransform = new Matrix<double>(2, 3);
CvInvoke.GetRotationMatrix2D(new PointF(halfWidth, halfHeight), -angle, scale, translateTransform);
var cos = Math.Abs(translateTransform[0, 0]);
var sin = Math.Abs(translateTransform[0, 1]);
// compute the new bounding dimensions of the image
int newWidth = (int) (src.Height * sin + src.Width * cos);
int newHeight = (int) (src.Height * cos + src.Width * sin);
// adjust the rotation matrix to take into account translation
translateTransform[0, 2] += newWidth / 2.0 - halfWidth;
translateTransform[1, 2] += newHeight / 2.0 - halfHeight;
CvInvoke.WarpAffine(src, dst, translateTransform, new Size(newWidth, newHeight));
}
/// <summary>
/// Scale image from it center, preserving src bounds
/// https://stackoverflow.com/a/62543674/933976
/// </summary>
/// <param name="src"><see cref="Mat"/> to transform</param>
/// <param name="xScale">X scale factor</param>
/// <param name="yScale">Y scale factor</param>
/// <param name="xTrans">X translation</param>
/// <param name="yTrans">Y translation</param>
/// <param name="dstSize">Destination size</param>
/// <param name="interpolation">Interpolation mode</param>
public static void TransformFromCenter(this Mat src, double xScale, double yScale, double xTrans = 0, double yTrans = 0, Size dstSize = default, Inter interpolation = Inter.Linear)
{
src.Transform(xScale, yScale,
xTrans + (src.Width - src.Width * xScale) / 2.0,
yTrans + (src.Height - src.Height * yScale) / 2.0, dstSize, interpolation);
}
public static void PutTextRotated(this Mat src, string text, Point org, FontFace fontFace, double fontScale, MCvScalar color,
int thickness = 1, LineType lineType = LineType.EightConnected, bool bottomLeftOrigin = false, double angle = 0)
{
if (angle % 360 == 0) // No rotation needed, cheaper cycle
{
CvInvoke.PutText(src, text, org, fontFace, fontScale, color, thickness, lineType, bottomLeftOrigin);
return;
}
using var rotatedSrc = src.Clone();
rotatedSrc.RotateAdjustBounds(-angle);
var sizeDifference = (rotatedSrc.Size - src.Size).Half();
org.Offset(sizeDifference.ToPoint());
org = org.Rotate(-angle, new Point(rotatedSrc.Size.Width / 2, rotatedSrc.Size.Height / 2));
CvInvoke.PutText(rotatedSrc, text, org, fontFace, fontScale, color, thickness, lineType, bottomLeftOrigin);
using var mask = rotatedSrc.CloneBlank();
CvInvoke.PutText(mask, text, org, fontFace, fontScale, WhiteColor, thickness, lineType, bottomLeftOrigin);
rotatedSrc.Rotate(angle, src.Size);
mask.Rotate(angle, src.Size);
rotatedSrc.CopyTo(src, mask);
}
/// <summary>
/// Determine the area (i.e. total number of pixels in the image),
/// initialize the output skeletonized image, and construct the
/// morphological structuring element
/// </summary>
/// <param name="src"></param>
/// <param name="iterations">Number of iterations required to perform the skeletoize</param>
/// <param name="ksize"></param>
/// <param name="elementShape"></param>
public static Mat Skeletonize(this Mat src, out int iterations, Size ksize = default, ElementShape elementShape = ElementShape.Rectangle)
{
if (ksize.IsEmpty) ksize = new Size(3, 3);
Point anchor = new(-1, -1);
var skeleton = src.CloneBlank();
using var kernel = CvInvoke.GetStructuringElement(elementShape, ksize, anchor);
var image = src;
using var temp = new Mat();
iterations = 0;
while (true)
{
iterations++;
// erode and dilate the image using the structuring element
using var eroded = new Mat();
CvInvoke.Erode(image, eroded, kernel, anchor, 1, BorderType.Reflect101, default);
CvInvoke.Dilate(eroded, temp, kernel, anchor, 1, BorderType.Reflect101, default);
// subtract the temporary image from the original, eroded
// image, then take the bitwise 'or' between the skeleton
// and the temporary image
CvInvoke.Subtract(image, temp, temp);
CvInvoke.BitwiseOr(skeleton, temp, skeleton);
image = eroded.Clone();
// if there are no more 'white' pixels in the image, then
// break from the loop
if (CvInvoke.CountNonZero(image) == 0) break;
}
return skeleton;
}
/// <summary>
/// Determine the area (i.e. total number of pixels in the image),
/// initialize the output skeletonized image, and construct the
/// morphological structuring element
/// </summary>
/// <param name="src"></param>
/// <param name="ksize"></param>
/// <param name="elementShape"></param>
public static Mat Skeletonize(this Mat src, Size ksize = default, ElementShape elementShape = ElementShape.Rectangle)
=> src.Skeletonize(out _, ksize, elementShape);
/// <summary>
/// Copy a <see cref="Mat"/> to center of other <see cref="Mat"/>
/// </summary>
/// <param name="src">Source <see cref="Mat"/> to be copied to</param>
/// <param name="dst">Target <see cref="Mat"/> to paste the <param name="src"></param></param>
public static void CopyToCenter(this Mat src, Mat dst)
{
if (dst.Step > src.Step && dst.Height > src.Height)
{
var dx = Math.Abs(dst.Step - src.Step) / 2;
var dy = Math.Abs(dst.Height - src.Height) / 2;
Mat m = new(dst, new Rectangle(dx, dy, src.Width, src.Height));
src.CopyTo(m);
}
else if (dst.Step < src.Step && dst.Height < src.Height)
{
var dx = Math.Abs(dst.Step - src.Step) / 2;
var dy = Math.Abs(dst.Height - src.Height) / 2;
Mat m = new(src, new Rectangle(dx, dy, dst.Width, dst.Height));
m.CopyTo(dst);
}
}
/// <summary>
/// Gets the total length of this <see cref="Mat"/></param>
/// </summary>
/// <param name="mat"></param>
/// <returns>The total length of this <see cref="Mat"/></returns>
public static int GetLength(this Mat mat)
{
return mat.Step * mat.Height;
}
/// <summary>
/// Gets a pixel index position on a span given X and Y
/// </summary>
/// <param name="mat"></param>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <returns>The pixel index position</returns>
public static int GetPixelPos(this Mat mat, int x, int y)
{
return y * mat.Step + x * mat.NumberOfChannels;
}
/// <summary>
/// Gets a pixel index position on a span given X and Y
/// </summary>
/// <param name="mat"></param>
/// <param name="point">X and Y Location</param>
/// <returns>The pixel index position</returns>
public static int GetPixelPos(this Mat mat, Point point)
{
return point.Y * mat.Step + point.X * mat.NumberOfChannels;
}
/// <summary>
/// Gets a byte array copy of this <see cref="Mat"/>
/// </summary>
/// <param name="mat"></param>
/// <returns>Byte array </returns>
public static byte[] GetBytes(this Mat mat)
{
byte[] data = new byte[mat.GetLength()];
Marshal.Copy(mat.DataPointer, data, 0, data.Length);
return data;
/*GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
using (Mat m2 = new Mat(mat.Size, mat.Depth, mat.NumberOfChannels, handle.AddrOfPinnedObject(),
mat.Width * mat.NumberOfChannels))
{
mat.CopyTo(m2);
}
handle.Free();*/
}
/// <summary>
/// Create a byte array of size of this <see cref="Mat"/>
/// </summary>
/// <param name="mat"></param>
/// <returns>Blank byte array</returns>
public static byte[] CreateByteArray(this Mat mat)
{
return new byte[mat.GetLength()];
}
public static Mat New(this Mat mat)
{
return new(mat.Rows, mat.Cols, mat.Depth, mat.NumberOfChannels);
}
public static Mat New(this Mat src, MCvScalar color)
{
Mat mat = new(src.Rows, src.Cols, src.Depth, src.NumberOfChannels);
mat.SetTo(color);
return mat;
}
/// <summary>
/// Clone this <see cref="Mat"/> blanked (All zeros)
/// </summary>
/// <param name="mat"></param>
/// <returns>Blanked <see cref="Mat"/></returns>
public static Mat CloneBlank(this Mat mat)
{
return InitMat(mat.Size, mat.NumberOfChannels, mat.Depth);
}
public static byte GetByte(this Mat mat, int pos)
{
//return new Span<byte>(IntPtr.Add(mat.DataPointer, pos).ToPointer(), mat.Step)[0];
var value = new byte[1];
Marshal.Copy(mat.DataPointer + pos, value, 0, value.Length);
return value[0];
}
public static byte GetByte(this Mat mat, int x, int y) => GetByte(mat, mat.GetPixelPos(x, y));
public static byte GetByte(this Mat mat, Point pos) => GetByte(mat, mat.GetPixelPos(pos.X, pos.Y));
public static void SetByte(this Mat mat, int pixel, byte value) => SetByte(mat, pixel, new[] {value});
public static void SetByte(this Mat mat, int pixel, byte[] value) =>
Marshal.Copy(value, 0, mat.DataPointer + pixel, value.Length);
public static void SetByte(this Mat mat, int x, int y, byte value) =>
SetByte(mat, x, y, new[] {value});
public static void SetByte(this Mat mat, int x, int y, byte[] value) =>
SetByte(mat, y * mat.Step + x * mat.NumberOfChannels, value);
public static void SetBytes(this Mat mat, byte[] value) =>
Marshal.Copy(value, 0, mat.DataPointer, value.Length);
public static Mat InitMat(Size size, int channels = 1, DepthType depthType = DepthType.Cv8U)
{
return Mat.Zeros(size.Height, size.Width, depthType, channels);
/*var mat = new Mat(size, depthType, channels);
switch (channels)
{
case 1:
mat.SetTo(BlackByte);
break;
case 3:
mat.SetTo(Black3Byte);
break;
case 4:
mat.SetTo(Transparent4Byte);
break;
}
return mat;*/
}
public static Mat InitMat(Size size, MCvScalar scalar, int channels = 1, DepthType depthType = DepthType.Cv8U)
{
var mat = new Mat(size, depthType, channels);
mat.SetTo(scalar);
return mat;
}
public static Mat RoiFromCenter(this Mat mat, Size targetSize, Rectangle roi)
{
if (targetSize == mat.Size) return mat;
var newMat = InitMat(targetSize);
var roiMat = new Mat(mat, roi);
//int xStart = mat.Width / 2 - targetSize.Width / 2;
//int yStart = mat.Height / 2 - targetSize.Height / 2;
var newMatRoi = new Mat(newMat, new Rectangle(
targetSize.Width / 2 - roi.Width / 2,
targetSize.Height / 2 - roi.Height / 2,
roi.Width,
roi.Height
));
roiMat.CopyTo(newMatRoi);
return newMat;
}
/// <summary>
/// Allocates a new array of mat 's
/// </summary>
/// <param name="count">Array size</param>
/// <returns></returns>
public static Mat[] Allocate(uint count) => Allocate(count, Size.Empty);
/// <summary>
/// Allocates a new array of mat 's
/// </summary>
/// <param name="count">Array size</param>
/// <param name="size">Image size to create, use <see cref="Size.Empty"/> to create a empty Mat</param>
/// <returns>New mat array</returns>
public static Mat[] Allocate(uint count, Size size)
{
var layers = new Mat[count];
for (var i = 0; i < layers.Length; i++)
{
layers[i] = size == Size.Empty ? new Mat() : InitMat(size);
}
return layers;
}
public static byte[] GetPngByes(this Mat mat)
{
using var vector = new VectorOfByte();
CvInvoke.Imencode(".png", mat, vector);
return vector.ToArray();
}
}
}
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