■ Bitmap 클래스에서 선명 가장자리 탐지 필터(Sharpen Edge Detection Filter)를 사용하는 방법을 보여준다.
▶ SharpenType.cs
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namespace TestProject { /// <summary> /// 선명 타입 /// </summary> public enum SharpenType { /// <summary> /// 선명 7:1 /// </summary> Sharpen7To1, /// <summary> /// 선명 9:1 /// </summary> Sharpen9To1, /// <summary> /// 선명 12:1 /// </summary> Sharpen12To1, /// <summary> /// 선명 24:1 /// </summary> Sharpen24To1, /// <summary> /// 선명 48:1 /// </summary> Sharpen48To1, /// <summary> /// 선명 5:4 /// </summary> Sharpen5To4, /// <summary> /// 선명 10:8 /// </summary> Sharpen10To8, /// <summary> /// 선명 11:8 /// </summary> Sharpen11To8, /// <summary> /// 선명 821 /// </summary> Sharpen821 } } |
▶ Matrix.cs
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namespace TestProject { /// <summary> /// 매트릭스 /// </summary> public static class Matrix { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 선명 7:1 - Sharpen7To1 /// <summary> /// 선명 7:1 /// </summary> public static double[,] Sharpen7To1 { get { return new double[,] { { 1, 1, 1 }, { 1, -7, 1 }, { 1, 1, 1 } }; } } #endregion #region 선명 9:1 - Sharpen9To1 /// <summary> /// 선명 9:1 /// </summary> public static double[,] Sharpen9To1 { get { return new double[,] { { -1, -1, -1 }, { -1, 9, -1 }, { -1, -1, -1 } }; } } #endregion #region 선명 12:1 - Sharpen12To1 /// <summary> /// 선명 12:1 /// </summary> public static double[,] Sharpen12To1 { get { return new double[,] { { -1, -1, -1 }, { -1, 12, -1 }, { -1, -1, -1 } }; } } #endregion #region 선명 24:1 - Sharpen24To1 /// <summary> /// 선명 24:1 /// </summary> public static double[,] Sharpen24To1 { get { return new double[,] { { -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1 }, { -1, -1, 24, -1, -1 }, { -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1 } }; } } #endregion #region 선명 48:1 - Sharpen48To1 /// <summary> /// 선명 48:1 /// </summary> public static double[,] Sharpen48To1 { get { return new double[,] { { -1, -1, -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1, -1, -1 }, { -1, -1, -1, 48, -1, -1, -1 }, { -1, -1, -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1, -1, -1 }, { -1, -1, -1, -1, -1, -1, -1 } }; } } #endregion #region 선명 5:4 - Sharpen5To4 /// <summary> /// 선명 5:4 /// </summary> public static double[,] Sharpen5To4 { get { return new double[,] { { 0, -1, 0 }, { -1, 5, -1 }, { 0, -1, 0 } }; } } #endregion #region 선명 10:8 - Sharpen10To8 /// <summary> /// 선명 10:8 /// </summary> public static double[,] Sharpen10To8 { get { return new double[,] { { 0, -2, 0 }, { -2, 10, -2 }, { 0, -2, 0 } }; } } #endregion #region 선명 11:8 - Sharpen11To8 /// <summary> /// 선명 11:8 /// </summary> public static double[,] Sharpen11To8 { get { return new double[,] { { 0, -2, 0 }, { -2, 11, -2 }, { 0, -2, 0 } }; } } #endregion #region 선명 821 - Sharpen821 /// <summary> /// 선명 821 /// </summary> public static double[,] Sharpen821 { get { return new double[,] { { -1, -1, -1, -1, -1 }, { -1, 2, 2, 2, -1 }, { -1, 2, 8, 2, 1 }, { -1, 2, 2, 2, -1 }, { -1, -1, -1, -1, -1 } }; } } #endregion } } |
▶ 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 { //////////////////////////////////////////////////////////////////////////////////////////////////// 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 선명 가장자리 탐지 필터 적용하기 - SharpenEdgeDetect(sourceBitmap, sharpenType, bias, grayscale, mono, medianFilterSize) /// <summary> /// 선명 가장자리 탐지 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="sharpenType">선명 타입</param> /// <param name="bias">바이어스</param> /// <param name="grayscale">회색조 여부</param> /// <param name="mono">모노 여부</param> /// <param name="medianFilterSize">중앙값 필터 크기</param> /// <returns>비트맵</returns> public static Bitmap ApplySharpenEdgeDetectionFilter ( Bitmap sourceBitmap, SharpenType sharpenType, int bias = 0, bool grayscale = false, bool mono = false, int medianFilterSize = 0 ) { Bitmap targetBitmap = null; if(medianFilterSize == 0) { targetBitmap = sourceBitmap; } else { targetBitmap = ApplyMedianFilter(sourceBitmap, medianFilterSize); } switch(sharpenType) { case SharpenType.Sharpen7To1 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen7To1, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen9To1 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen9To1, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen12To1 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen12To1, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen24To1 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen24To1, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen48To1 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen48To1, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen5To4 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen5To4, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen10To8 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen10To8, 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen11To8 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen11To8, 3.0 / 1.0, bias, grayscale, mono); break; case SharpenType.Sharpen821 : targetBitmap = ApplySharpenEdgeDetectionFilter(targetBitmap, Matrix.Sharpen821, 8.0 / 1.0, bias, grayscale, mono); break; } return targetBitmap; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 중앙값 필터 적용하기 - ApplyMedianFilter(sourceBitmap, matrixSize) /// <summary> /// 중앙값 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="matrixSize">매트릭스 크기</param> /// <returns>비트맵</returns> private static Bitmap ApplyMedianFilter(Bitmap sourceBitmap, int matrixSize) { 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 temporaryOffset = 0; int byteOffset = 0; List<int> neighbourPixelList = new List<int>(); byte[] middlePixel; for(int offsetY = filterOffset; offsetY < sourceBitmap.Height - filterOffset; offsetY++) { for(int offsetX = filterOffset; offsetX < sourceBitmap.Width - filterOffset; offsetX++) { byteOffset = offsetY * sourceBitmapData.Stride + offsetX * 4; neighbourPixelList.Clear(); for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { temporaryOffset = byteOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); neighbourPixelList.Add(BitConverter.ToInt32(sourceByteArray, temporaryOffset)); } } neighbourPixelList.Sort(); middlePixel = BitConverter.GetBytes(neighbourPixelList[filterOffset]); targetByteArray[byteOffset ] = middlePixel[0]; targetByteArray[byteOffset + 1] = middlePixel[1]; targetByteArray[byteOffset + 2] = middlePixel[2]; targetByteArray[byteOffset + 3] = middlePixel[3]; } } 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 #region 선명 가장자리 탐지 필터 적용하기 - ApplySharpenEdgeDetectionFilter(sourceBitmap, filterArray, factor, bias, grayscale, mono) /// <summary> /// 선명 가장자리 탐지 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> /// <param name="grayscale">회색조 여부</param> /// <param name="mono">모노 여부</param> /// <returns>비트맵</returns> private static Bitmap ApplySharpenEdgeDetectionFilter ( Bitmap sourceBitmap, double[,] filterArray, double factor = 1, int bias = 0, bool grayscale = false, bool mono = false ) { 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); if(grayscale == true) { for(int pixel = 0; pixel < sourceByteArray.Length; pixel += 4) { sourceByteArray[pixel ] = (byte)(sourceByteArray[pixel ] * 0.11f); sourceByteArray[pixel + 1] = (byte)(sourceByteArray[pixel + 1] * 0.59f); sourceByteArray[pixel + 2] = (byte)(sourceByteArray[pixel + 2] * 0.3f ); } } double blue = 0.0; double green = 0.0; double red = 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 filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmapData.Stride); blue += (double)(sourceByteArray[sourceOffset ]) * filterArray[filterY + filterOffset, filterX + filterOffset]; green += (double)(sourceByteArray[sourceOffset + 1]) * filterArray[filterY + filterOffset, filterX + filterOffset]; red += (double)(sourceByteArray[sourceOffset + 2]) * filterArray[filterY + filterOffset, filterX + filterOffset]; } } if(mono == true) { blue = targetByteArray[targetOffset ] - factor * blue; green = targetByteArray[targetOffset + 1] - factor * green; red = targetByteArray[targetOffset + 2] - factor * red; blue = (blue > bias ? 255 : 0); green = (blue > bias ? 255 : 0); red = (blue > bias ? 255 : 0); } else { blue = targetByteArray[targetOffset ] - factor * blue + bias; green = targetByteArray[targetOffset + 1] - factor * green + bias; red = targetByteArray[targetOffset + 2] - factor * red + bias; 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.ApplySharpenEdgeDetectionFilter(sourceBitmap, SharpenType.Sharpen5To4); this.pictureBox.SizeMode = PictureBoxSizeMode.Zoom; this.pictureBox.Image = targetBitmap; } #endregion } } |