■ Bitmap 클래스에서 부울 가장자리 탐지 필터(Boolean Edge Detection Filter)를 사용하는 방법을 보여준다.
▶ BooleanFilterType.cs
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namespace TestProject { /// <summary> /// 부울 필터 타입 /// </summary> public enum BooleanFilterType { /// <summary> /// 가장자리 탐지 /// </summary> EdgeDetection, /// <summary> /// 선명화 /// </summary> Sharpen } } |
▶ BitmapHelper.cs
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using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 가장자리 마스크 리스트 /// </summary> private static List<string> _edgeMaskList; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Static #region 생성자 - BitmapHelper() /// <summary> /// 생성자 /// </summary> static BitmapHelper() { _edgeMaskList = new List<string>(); _edgeMaskList.Add("011011011"); _edgeMaskList.Add("000111111"); _edgeMaskList.Add("110110110"); _edgeMaskList.Add("111111000"); _edgeMaskList.Add("011011001"); _edgeMaskList.Add("100110110"); _edgeMaskList.Add("111011000"); _edgeMaskList.Add("111110000"); _edgeMaskList.Add("111011001"); _edgeMaskList.Add("100110111"); _edgeMaskList.Add("001011111"); _edgeMaskList.Add("111110100"); _edgeMaskList.Add("000011111"); _edgeMaskList.Add("000110111"); _edgeMaskList.Add("001011011"); _edgeMaskList.Add("001011011"); _edgeMaskList.Add("110110100"); } #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 부울 가장자리 탐지 필터 적용하기 - ApplyBooleanEdgeDetectionFilter(sourceBitmap, filterType, redFactor, greenFactor, blueFactor, threshold) /// <summary> /// 부울 가장자리 탐지 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="filterType">필터 타입</param> /// <param name="redFactor">적색 팩터</param> /// <param name="greenFactor">녹색 팩터</param> /// <param name="blueFactor">청색 팩터</param> /// <param name="threshold">임계치</param> /// <returns>비트맵</returns> public static Bitmap ApplyBooleanEdgeDetectionFilter ( Bitmap sourceBitmap, BooleanFilterType filterType, float redFactor = 1.0f, float greenFactor = 1.0f, float blueFactor = 1.0f, byte threshold = 0 ) { 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 = 1; int sourceOffset = 0; int targetOffset = 0; int matrixMean = 0; int matrixTotal = 0; double matrixVariance = 0; double blueValue = 0; double greenValue = 0; double redValue = 0; string matrixPatern = string.Empty; for(int offsetY = filterOffset; offsetY < sourceBitmap.Height - filterOffset; offsetY++) { for(int offsetX = filterOffset; offsetX < sourceBitmap.Width - filterOffset; offsetX++) { targetOffset = offsetY * sourceBitmapData.Stride + offsetX * 4; matrixMean = 0; matrixTotal = 0; matrixVariance = 0; matrixPatern = string.Empty; for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); matrixMean += sourceByteArray[sourceOffset ]; matrixMean += sourceByteArray[sourceOffset + 1]; matrixMean += sourceByteArray[sourceOffset + 2]; } } matrixMean = matrixMean / 9; for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); matrixTotal = sourceByteArray[sourceOffset ]; matrixTotal += sourceByteArray[sourceOffset + 1]; matrixTotal += sourceByteArray[sourceOffset + 2]; matrixPatern += (matrixTotal > matrixMean ? "1" : "0" ); matrixVariance += Math.Pow ( matrixMean - (sourceByteArray[sourceOffset ] + sourceByteArray[sourceOffset + 1] + sourceByteArray[sourceOffset + 2]), 2 ); } } matrixVariance = matrixVariance / 9; if(filterType == BooleanFilterType.Sharpen) { blueValue = sourceByteArray[targetOffset ]; greenValue = sourceByteArray[targetOffset + 1]; redValue = sourceByteArray[targetOffset + 2]; if(matrixVariance > threshold) { if(_edgeMaskList.Contains(matrixPatern)) { blueValue = (blueValue * blueFactor ); greenValue = (greenValue * greenFactor); redValue = (redValue * redFactor ); blueValue = (blueValue > 255 ? 255 : (blueValue < 0 ? 0 : blueValue )); greenValue = (greenValue > 255 ? 255 : (greenValue < 0 ? 0 : greenValue)); redValue = (redValue > 255 ? 255 : (redValue < 0 ? 0 : redValue )); } } } else if(matrixVariance > threshold && _edgeMaskList.Contains(matrixPatern)) { blueValue = 255; greenValue = 255; redValue = 255; } else { blueValue = 0; greenValue = 0; redValue = 0; } targetByteArray[targetOffset ] = (byte)blueValue; targetByteArray[targetOffset + 1] = (byte)greenValue; targetByteArray[targetOffset + 2] = (byte)redValue; 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.ApplyBooleanEdgeDetectionFilter(sourceBitmap, BooleanFilterType.EdgeDetection, 1, 1, 1, 64); this.pictureBox.SizeMode = PictureBoxSizeMode.Zoom; this.pictureBox.Image = targetBitmap; } #endregion } } |
