■ Bitmap 클래스에서 불선명 필터(Unsharp Filter)를 사용하는 방법을 보여준다.
▶ Matrix.cs
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namespace TestProject { /// <summary> /// 매트릭스 /// </summary> public static class Matrix { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region Gaussian 3X3 - Gaussian3X3 /// <summary> /// Gaussian 3X3 /// </summary> public static double[,] Gaussian3X3 { get { return new double[,] { { 1, 2, 1 }, { 2, 4, 2 }, { 1, 2, 1 } }; } } #endregion #region Gaussian 5X5 - Gaussian5X5 /// <summary> /// Gaussian 5X5 /// </summary> public static double[,] Gaussian5X5 { get { return new double[,] { { 2, 4 , 5 , 4 , 2 }, { 4, 9 , 12, 9 , 4 }, { 5, 12, 15, 12, 5 }, { 4, 9 , 12, 9 , 4 }, { 2, 4 , 5 , 4 , 2 } }; } } #endregion #region Mean 3X3 - Mean3X3 /// <summary> /// Mean 3X3 /// </summary> public static double[,] Mean3X3 { get { return new double[,] { { 1, 1, 1 }, { 1, 1, 1 }, { 1, 1, 1 } }; } } #endregion #region Mean 5X5 - Mean5X5 /// <summary> /// Mean 5X5 /// </summary> public static double[,] Mean5X5 { 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, 1 } }; } } #endregion } } |
▶ 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 불선명 가우시안 3X3 필터 적용하기 - ApplyUnsharpGaussian3X3Filter(sourceBitmap, factor) /// <summary> /// 불선명 가우시안 3X3 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="factor">팩터</param> /// <returns>비트맵</returns> public static Bitmap ApplyUnsharpGaussian3X3Filter(Bitmap sourceBitmap, float factor = 1.0f) { Bitmap blurBitmap = ApplyConvolutionFilter(sourceBitmap, Matrix.Gaussian3X3, 1.0 / 16.0); Bitmap targetBitmap = ApplySubtractionAdditionFilter(sourceBitmap, blurBitmap, factor); return targetBitmap; } #endregion #region 불선명 가우시안 5X5 필터 적용하기 - ApplyUnsharpGaussian5X5Filter(sourceBitmap, factor) /// <summary> /// 불선명 가우시안 5X5 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="factor">팩터</param> /// <returns>비트맵</returns> public static Bitmap ApplyUnsharpGaussian5X5Filter(Bitmap sourceBitmap, float factor = 1.0f) { Bitmap blurBitmap = ApplyConvolutionFilter(sourceBitmap, Matrix.Gaussian5X5, 1.0 / 159.0); Bitmap targetBitmap = ApplySubtractionAdditionFilter(sourceBitmap, blurBitmap, factor); return targetBitmap; } #endregion #region 불선명 중간 3X3 필터 적용하기 - ApplyUnsharpMean3X3Filter(sourceBitmap, factor) /// <summary> /// 불선명 중간 3X3 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="factor">팩터</param> /// <returns>비트맵</returns> public static Bitmap ApplyUnsharpMean3X3Filter(Bitmap sourceBitmap, float factor = 1.0f) { Bitmap blurBitmap = ApplyConvolutionFilter(sourceBitmap, Matrix.Mean3X3, 1.0 / 9.0); Bitmap targetBitmap = ApplySubtractionAdditionFilter(sourceBitmap, blurBitmap, factor); return targetBitmap; } #endregion #region 불선명 중간 5X5 필터 적용하기 - ApplyUnsharpMean5X5Filter(sourceBitmap, factor) /// <summary> /// 불선명 중간 5X5 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="factor">팩터</param> /// <returns>비트맵</returns> public static Bitmap ApplyUnsharpMean5X5Filter(Bitmap sourceBitmap, float factor = 1.0f) { Bitmap blurBitmap = ApplyConvolutionFilter(sourceBitmap, Matrix.Mean5X5, 1.0 / 25.0); Bitmap targetBitmap = ApplySubtractionAdditionFilter(sourceBitmap, blurBitmap, factor); return targetBitmap; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 회선 필터 적용하기 - ApplyConvolutionFilter(sourceBitmap, filterArray, factor, bias, grayscale) /// <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> /// <param name="grayscale">회색조 여부</param> /// <returns>비트맵</returns> private static Bitmap ApplyConvolutionFilter ( Bitmap sourceBitmap, double[,] filterArray, double factor = 1, int bias = 0, bool grayscale = 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) { float rgb = 0; for(int k = 0; k < sourceByteArray.Length; k += 4) { rgb = sourceByteArray[k ] * 0.11f; rgb += sourceByteArray[k + 1] * 0.59f; rgb += sourceByteArray[k + 2] * 0.3f; sourceByteArray[k ] = (byte )rgb; sourceByteArray[k + 1] = sourceByteArray[k]; sourceByteArray[k + 2] = sourceByteArray[k]; sourceByteArray[k + 3] = 255; } } 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]; } } 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; } 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 #region 감산/가산 필터 적용하기 - ApplySubtractionAdditionFilter(sourceBitmap1, sourceBitmap2, factor) /// <summary> /// 감산/가산 필터 적용하기 /// </summary> /// <param name="sourceBitmap1">소스 비트맵 1</param> /// <param name="sourceBitmap2">소스 비트맵 2</param> /// <param name="factor">팩터</param> /// <returns>비트맵</returns> private static Bitmap ApplySubtractionAdditionFilter(Bitmap sourceBitmap1, Bitmap sourceBitmap2, float factor = 1.0f) { BitmapData sourceBitmapData1 = sourceBitmap1.LockBits ( new Rectangle (0, 0, sourceBitmap1.Width, sourceBitmap1.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); BitmapData sourceBitmapData2 = sourceBitmap2.LockBits ( new Rectangle (0, 0, sourceBitmap2.Width, sourceBitmap2.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); byte[] sourceByteArray1 = new byte[sourceBitmapData1.Stride * sourceBitmapData1.Height]; byte[] sourceByteArray2 = new byte[sourceBitmapData2.Stride * sourceBitmapData2.Height]; byte[] targetByteArray = new byte[sourceBitmapData1.Stride * sourceBitmapData1.Height]; Marshal.Copy(sourceBitmapData1.Scan0, sourceByteArray1, 0, sourceByteArray1.Length); Marshal.Copy(sourceBitmapData2.Scan0, sourceByteArray2, 0, sourceByteArray2.Length); sourceBitmap1.UnlockBits(sourceBitmapData1); sourceBitmap2.UnlockBits(sourceBitmapData2); double blue = 0; double green = 0; double red = 0; for(int k = 0; k < targetByteArray.Length && k < sourceByteArray2.Length; k += 4) { blue = sourceByteArray1[k ] + (sourceByteArray1[k ] - sourceByteArray2[k ]) * factor; green = sourceByteArray1[k + 1] + (sourceByteArray1[k + 1] - sourceByteArray2[k + 1]) * factor; red = sourceByteArray1[k + 2] + (sourceByteArray1[k + 2] - sourceByteArray2[k + 2]) * factor; blue = (blue < 0 ? 0 : (blue > 255 ? 255 : blue )); green = (green < 0 ? 0 : (green > 255 ? 255 : green)); red = (red < 0 ? 0 : (red > 255 ? 255 : red )); targetByteArray[k ] = (byte)blue; targetByteArray[k + 1] = (byte)green; targetByteArray[k + 2] = (byte)red; targetByteArray[k + 3] = 255; } Bitmap targetBitmap = new Bitmap(sourceBitmap1.Width, sourceBitmap1.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.ApplyUnsharpMean5X5Filter(sourceBitmap, 0.5f); this.pictureBox.SizeMode = PictureBoxSizeMode.Zoom; this.pictureBox.Image = targetBitmap; } #endregion } } |
