■ Bitmap 클래스에서 컴파스 가장자리 탐지 필터(Compass Edge Detection Filter)를 사용하는 방법을 보여준다.
▶ CompassEdgeDetectionType.cs
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namespace TestProject { /// <summary> /// 컴파스 가장자리 탐지 타입 /// </summary> public enum CompassEdgeDetectionType { /// <summary> /// Prewitt 3X3X4 /// </summary> Prewitt3X3X4, /// <summary> /// Prewitt 3X3X8 /// </summary> Prewitt3X3X8, /// <summary> /// Prewitt 5X5X4 /// </summary> Prewitt5X5X4, /// <summary> /// Sobel 3X3X4 /// </summary> Sobel3X3X4, /// <summary> /// Sobel 3X3X8 /// </summary> Sobel3X3X8, /// <summary> /// Sobel 5X5X4 /// </summary> Sobel5X5X4, /// <summary> /// Scharr 3X3X4 /// </summary> Scharr3X3X4, /// <summary> /// Scharr 3X3X8 /// </summary> Scharr3X3X8, /// <summary> /// Scharr 5X5X4 /// </summary> Scharr5X5X4, /// <summary> /// Kirsch 3X3X4 /// </summary> Kirsch3X3X4, /// <summary> /// Kirsch 3X3X8 /// </summary> Kirsch3X3X8, /// <summary> /// Isotropic 3X3X4 /// </summary> Isotropic3X3X4, /// <summary> /// Isotropic 3X3X8 /// </summary> Isotropic3X3X8 } } |
▶ BitmapHelper.cs
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using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region Prewitt 3X3X4 - Prewitt3X3X4 /// <summary> /// Prewitt 3X3X4 /// </summary> public static double[,,] Prewitt3X3X4 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -1, 0, 1 }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Prewitt 3X3X8 - Prewitt3X3X8 /// <summary> /// Prewitt 3X3X8 /// </summary> public static double[,,] Prewitt3X3X8 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -1, 0, 1 }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 45); return kernelArray; } } #endregion #region Prewitt 5X5X4 - Prewitt5X5X4 /// <summary> /// Prewitt 5X5X4 /// </summary> public static double[,,] Prewitt5X5X4 { get { double[,] baseKernelArray = new double[,] { { -2, -1, 0, 1, 2 }, { -2, -1, 0, 1, 2 }, { -2, -1, 0, 1, 2 }, { -2, -1, 0, 1, 2 }, { -2, -1, 0, 1, 2 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Kirsch 3X3X4 - Kirsch3X3X4 /// <summary> /// Kirsch 3X3X4 /// </summary> public static double[,,] Kirsch3X3X4 { get { double[,] baseKernelArray = new double[,] { { -3, -3, 5 }, { -3, 0, 5 }, { -3, -3, 5 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Kirsch 3X3X8 - Kirsch3X3X8 /// <summary> /// Kirsch 3X3X8 /// </summary> public static double[,,] Kirsch3X3X8 { get { double[,] baseKernelArray = new double[,] { { -3, -3, 5 }, { -3, 0, 5 }, { -3, -3, 5 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 45); return kernelArray; } } #endregion #region Sobel 3X3X4 - Sobel3X3X4 /// <summary> /// Sobel 3X3X4 /// </summary> public static double[,,] Sobel3X3X4 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -2, 0, 2 }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Sobel 3X3X8 - Sobel3X3X8 /// <summary> /// Sobel3X3X8 /// </summary> public static double[,,] Sobel3X3X8 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -2, 0, 2 }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 45); return kernelArray; } } #endregion #region Sobel 5X5X4 - Sobel5X5X4 /// <summary> /// Sobel 5X5X4 /// </summary> public static double[,,] Sobel5X5X4 { get { double[,] baseKernelArray = new double[,] { { -5, -4, 0, 4, 5 }, { -8, -10, 0, 10, 8 }, { -10, -20, 0, 20, 10 }, { -8, -10, 0, 10, 8 }, { -5, -4, 0, 4, 5 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Scharr 3X3X4 - Scharr3X3X4 /// <summary> /// Scharr 3X3X4 /// </summary> public static double[,,] Scharr3X3X4 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -3, 0, 3 }, { -1, 0, 1 } }; double[, ,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Scharr 3X3X8 - Scharr3X3X8 /// <summary> /// Scharr 3X3X8 /// </summary> public static double[,,] Scharr3X3X8 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -3, 0, 3 }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 45); return kernelArray; } } #endregion #region Scharr 5X5X4 - Scharr5X5X4 /// <summary> /// Scharr 5X5X4 /// </summary> public static double[, ,] Scharr5X5X4 { get { double[,] baseKernelArray = new double[,] { { -1, -1, 0, 1, 1 }, { -2, -2, 0, 2, 2 }, { -3, -6, 0, 6, 3 }, { -2, -2, 0, 2, 2 }, { -1, -1, 0, 1, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Isotropic 3X3X4 - Isotropic3X3X4 /// <summary> /// Isotropic 3X3X4 /// </summary> public static double[,,] Isotropic3X3X4 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -Math.Sqrt(2), 0, Math.Sqrt(2) }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 90); return kernelArray; } } #endregion #region Isotropic 3X3X8 - Isotropic3X3X8 /// <summary> /// Isotropic 3X3X8 /// </summary> public static double[,,] Isotropic3X3X8 { get { double[,] baseKernelArray = new double[,] { { -1, 0, 1 }, { -Math.Sqrt(2), 0, Math.Sqrt(2) }, { -1, 0, 1 } }; double[,,] kernelArray = RotateArray(baseKernelArray, 45); return kernelArray; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 비트맵 로드하기 - LoadBitmap(filePath) /// <summary> /// 비트맵 로드하기 /// </summary> /// <param name="filePath">파일 경로</param> /// <returns>비트맵</returns> public static Bitmap LoadBitmap(string filePath) { using(Bitmap bitmap = new Bitmap(filePath)) { return new Bitmap(bitmap); } } #endregion #region 컴파스 가장자리 탐지 필터 적용하기 - ApplyCompassEdgeDetectionFilter(sourceBitmap, compassEdgeDetectionType) /// <summary> /// 컴파스 가장자리 탐지 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="compassEdgeDetectionType">컴파스 가장자리 탐지 타입</param> /// <returns>비트맵</returns> public static Bitmap ApplyCompassEdgeDetectionFilter(Bitmap sourceBitmap, CompassEdgeDetectionType compassEdgeDetectionType) { Bitmap targetBitmap = null; switch(compassEdgeDetectionType) { case CompassEdgeDetectionType.Sobel3X3X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Sobel3X3X4, 1.0 / 4.0); break; case CompassEdgeDetectionType.Sobel3X3X8 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Sobel3X3X8, 1.0/ 4.0); break; case CompassEdgeDetectionType.Sobel5X5X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Sobel5X5X4, 1.0/ 84.0); break; case CompassEdgeDetectionType.Prewitt3X3X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Prewitt3X3X4, 1.0 / 3.0); break; case CompassEdgeDetectionType.Prewitt3X3X8 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Prewitt3X3X8, 1.0/ 3.0); break; case CompassEdgeDetectionType.Prewitt5X5X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Prewitt5X5X4, 1.0 / 15.0); break; case CompassEdgeDetectionType.Scharr3X3X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Scharr3X3X4, 1.0 / 4.0); break; case CompassEdgeDetectionType.Scharr3X3X8 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Scharr3X3X8, 1.0 / 4.0); break; case CompassEdgeDetectionType .Scharr5X5X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Scharr5X5X4, 1.0 / 21.0); break; case CompassEdgeDetectionType.Kirsch3X3X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Kirsch3X3X4, 1.0 / 15.0); break; case CompassEdgeDetectionType.Kirsch3X3X8 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Kirsch3X3X8, 1.0 / 15.0); break; case CompassEdgeDetectionType.Isotropic3X3X4 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Isotropic3X3X4, 1.0 / 3.4); break; case CompassEdgeDetectionType.Isotropic3X3X8 : targetBitmap = ApplyConvolutionFilter(sourceBitmap, Isotropic3X3X8, 1.0 / 3.4); break; } return targetBitmap; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 배열 회전하기 - RotateArray(sourceArray, angle) /// <summary> /// 배열 회전하기 /// </summary> /// <param name="sourceArray">소스 배열</param> /// <param name="angle">각도</param> /// <returns>배열</returns> private static double[,,] RotateArray(double[,] sourceArray, double angle) { double[,,] targetArray = new double[(int )(360 / angle), sourceArray.GetLength(0), sourceArray.GetLength(1)]; int xOffset = sourceArray.GetLength(1) / 2; int yOffset = sourceArray.GetLength(0) / 2; for(int y = 0; y < sourceArray.GetLength(0); y++) { for (int x = 0; x < sourceArray.GetLength(1); x++) { for(int compass = 0; compass < targetArray.GetLength(0); compass++) { double radian = compass * angle * Math.PI / 180.0; int targetX = (int)(Math.Round((x - xOffset) * Math.Cos(radian) - (y - yOffset) * Math.Sin(radian)) + xOffset); int targetY = (int)(Math.Round((x - xOffset) * Math.Sin(radian) + (y - yOffset) * Math.Cos(radian)) + yOffset); targetArray[compass, targetY, targetX] = sourceArray[y, x]; } } } return targetArray; } #endregion #region 회선 필터 적용하기 - ApplyConvolutionFilter(sourceBitmap, filterArray, factor, bias) /// <summary> /// 회선 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="filterArray">필터 배열</param> /// <param name="factor">팩터</param> /// <param name="bias">바이어스</param> /// <returns>비트맵</returns> private static Bitmap ApplyConvolutionFilter(Bitmap sourceBitmap, double[,,] filterArray, double factor = 1, int bias = 0) { BitmapData sourceBitmapData = sourceBitmap.LockBits ( new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); byte[] sourceArray = new byte [sourceBitmapData.Stride * sourceBitmapData.Height]; byte[] targetArray = new byte [sourceBitmapData.Stride * sourceBitmapData.Height]; Marshal.Copy(sourceBitmapData.Scan0, sourceArray, 0, sourceArray.Length); sourceBitmap.UnlockBits(sourceBitmapData); double blue = 0.0; double green = 0.0; double red = 0.0; double blueCompass = 0.0; double greenCompass = 0.0; double redCompass = 0.0; int filterWidth = filterArray.GetLength(1); int filterHeight = filterArray.GetLength(0); int filterOffset = (filterWidth-1) / 2; int sourceOffset = 0; int targetOffset = 0; for(int offsetY = filterOffset; offsetY < sourceBitmap.Height - filterOffset; offsetY++) { for(int offsetX = filterOffset; offsetX < sourceBitmap.Width - filterOffset; offsetX++) { blue = 0; green = 0; red = 0; targetOffset = offsetY * sourceBitmapData.Stride + offsetX * 4; for(int compass = 0; compass < filterArray.GetLength(0); compass++) { blueCompass = 0.0; greenCompass = 0.0; redCompass = 0.0; for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); blueCompass += (double)(sourceArray[sourceOffset ]) * filterArray[compass, filterY + filterOffset, filterX + filterOffset]; greenCompass += (double)(sourceArray[sourceOffset + 1]) * filterArray[compass, filterY + filterOffset, filterX + filterOffset]; redCompass += (double)(sourceArray[sourceOffset + 2]) * filterArray[compass, filterY + filterOffset, filterX + filterOffset]; } } blue = (blueCompass > blue ? blueCompass : blue ); green = (greenCompass > green ? greenCompass : green); red = (redCompass > red ? redCompass : red ); } blue = factor * blue + bias; green = factor * green + bias; red = factor * red + bias; if(blue > 255) { blue = 255; } else if(blue < 0) { blue = 0; } if(green > 255) { green = 255; } else if(green < 0) { green = 0; } if(red > 255) { red = 255; } else if(red < 0) { red = 0; } targetArray[targetOffset ] = (byte)(blue); targetArray[targetOffset + 1] = (byte)(green); targetArray[targetOffset + 2] = (byte)(red); targetArray[targetOffset + 3] = 255; } } Bitmap targetBitmap = new Bitmap(sourceBitmap.Width, sourceBitmap.Height); BitmapData targetBitmapData = targetBitmap.LockBits ( new Rectangle (0, 0, targetBitmap.Width, targetBitmap.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb ); Marshal.Copy(targetArray, 0, targetBitmapData.Scan0, targetArray.Length); targetBitmap.UnlockBits(targetBitmapData); return targetBitmap; } #endregion } } |
▶ MainForm.cs
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using System.Drawing; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); Bitmap sourceBitmap = BitmapHelper.LoadBitmap("IMAGE\\sample.jpg"); Bitmap targetBitmap = BitmapHelper.ApplyCompassEdgeDetectionFilter ( sourceBitmap, CompassEdgeDetectionType.Isotropic3X3X4 ); this.pictureBox.SizeMode = PictureBoxSizeMode.Zoom; this.pictureBox.Image = targetBitmap; } #endregion } } |
