■ Bitmap 클래스에서 침식/팽창 필터(Erosion/Dilation Filter)를 사용하는 방법을 보여준다.
▶ MorphologyType.cs
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namespace TestProject { /// <summary> /// 형태 타입 /// </summary> public enum MorphologyType { /// <summary> /// 침식 /// </summary> Erosion, /// <summary> /// 팽창 /// </summary> Dilation } } |
▶ MorphologyEdgeType.cs
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namespace TestProject { /// <summary> /// 형태 가장자리 타입 /// </summary> public enum MorphologyEdgeType { /// <summary> /// 해당 무 /// </summary> None, /// <summary> /// 가장자리 탐지 /// </summary> EdgeDetection, /// <summary> /// 선명 가장자리 탐지 /// </summary> SharpenEdgeDetection } } |
▶ BitmapHelper.cs
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using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// 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 침식/팽창 필터 적용하기 - ApplyErosionAndDilationFilter(sourceBitmap, matrixSize, morphType, applyBlue, applyGreen, applyRed, edgeType) /// <summary> /// 침식/팽창 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="matrixSize">매트릭스 크기</param> /// <param name="morphType">형태 타입</param> /// <param name="applyBlue">청색 채널 적용 여부</param> /// <param name="applyGreen">녹색 채널 적용 여부</param> /// <param name="applyRed">적색 채널 적용 여부</param> /// <param name="edgeType">형태 가장자리 타입</param> /// <returns>비트맵</returns> public static Bitmap ApplyErosionAndDilationFilter ( Bitmap sourceBitmap, int matrixSize, MorphologyType morphType, bool applyBlue = true, bool applyGreen = true, bool applyRed = true, MorphologyEdgeType edgeType = MorphologyEdgeType.None ) { BitmapData sourceBitmapData = sourceBitmap.LockBits ( new Rectangle (0, 0, sourceBitmap.Width, sourceBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); byte[] sourceByteArray = new byte[sourceBitmapData.Stride * sourceBitmapData.Height]; byte[] targetByteArray = new byte[sourceBitmapData.Stride * sourceBitmapData.Height]; Marshal.Copy(sourceBitmapData.Scan0, sourceByteArray, 0, sourceByteArray.Length); sourceBitmap.UnlockBits(sourceBitmapData); int filterOffset = (matrixSize - 1) / 2; int sourceOffset = 0; int targetOffset = 0; int blue = 0; int green = 0; int red = 0; byte morphResetValue = 0; if(morphType == MorphologyType.Erosion) { morphResetValue = 255; } for(int offsetY = filterOffset; offsetY < sourceBitmap.Height - filterOffset; offsetY++) { for(int offsetX = filterOffset; offsetX < sourceBitmap.Width - filterOffset; offsetX++) { targetOffset = offsetY * sourceBitmapData.Stride + offsetX * 4; blue = morphResetValue; green = morphResetValue; red = morphResetValue; if(morphType == MorphologyType.Dilation) { for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); if(sourceByteArray[sourceOffset] > blue) { blue = sourceByteArray[sourceOffset]; } if(sourceByteArray[sourceOffset + 1] > green) { green = sourceByteArray[sourceOffset + 1]; } if(sourceByteArray[sourceOffset + 2] > red) { red = sourceByteArray[sourceOffset + 2]; } } } } else if(morphType == MorphologyType.Erosion) { for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); if(sourceByteArray[sourceOffset] < blue) { blue = sourceByteArray[sourceOffset]; } if(sourceByteArray[sourceOffset + 1] < green) { green = sourceByteArray[sourceOffset + 1]; } if(sourceByteArray[sourceOffset + 2] < red) { red = sourceByteArray[sourceOffset + 2]; } } } } if(applyBlue == false ) { blue = sourceByteArray[targetOffset]; } if(applyGreen == false ) { green = sourceByteArray[targetOffset + 1]; } if(applyRed == false ) { red = sourceByteArray[targetOffset + 2]; } if(edgeType == MorphologyEdgeType.EdgeDetection || edgeType == MorphologyEdgeType.SharpenEdgeDetection) { if(morphType == MorphologyType.Dilation) { blue = blue - sourceByteArray[targetOffset ]; green = green - sourceByteArray[targetOffset + 1]; red = red - sourceByteArray[targetOffset + 2]; } else if(morphType == MorphologyType.Erosion) { blue = sourceByteArray[targetOffset ] - blue; green = sourceByteArray[targetOffset + 1] - green; red = sourceByteArray[targetOffset + 2] - red; } if(edgeType == MorphologyEdgeType.SharpenEdgeDetection) { blue += sourceByteArray[targetOffset ]; green += sourceByteArray[targetOffset + 1]; red += sourceByteArray[targetOffset + 2]; } } blue = (blue > 255 ? 255 : (blue < 0 ? 0 : blue )); green = (green > 255 ? 255 : (green < 0 ? 0 : green)); red = (red > 255 ? 255 : (red < 0 ? 0 : red )); targetByteArray[targetOffset ] = (byte)blue; targetByteArray[targetOffset + 1] = (byte)green; targetByteArray[targetOffset + 2] = (byte)red; targetByteArray[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(targetByteArray, 0, targetBitmapData.Scan0, targetByteArray.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.ApplyErosionAndDilationFilter ( sourceBitmap, 3, MorphologyType.Erosion, true, true, true, MorphologyEdgeType.EdgeDetection ); this.pictureBox.SizeMode = PictureBoxSizeMode.Zoom; this.pictureBox.Image = targetBitmap; } #endregion } } |
