■ Bitmap 클래스에서 스테인 글라스 필터(Stained Glass Filter)를 사용하는 방법을 보여준다.
▶ DistanceType.cs
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namespace TestProject { /// <summary> /// 거리 타입 /// </summary> public enum DistanceType { /// <summary> /// 유클리드 /// </summary> Euclidean, /// <summary> /// 맨하탄 /// </summary> Manhattan, /// <summary> /// 체비쇼프 /// </summary> Chebyshev } } |
▶ Pixel.cs
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namespace TestProject { /// <summary> /// 픽셀 /// </summary> public class Pixel { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 오프셋 X /// </summary> private int xOffset = 0; /// <summary> /// 오프셋 Y /// </summary> private int yOffset = 0; /// <summary> /// 청색 /// </summary> private byte blue = 0; /// <summary> /// 녹색 /// </summary> private byte green = 0; /// <summary> /// 적색 /// </summary> private byte red = 0; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region X 오프셋 - XOffset /// <summary> /// X 오프셋 /// </summary> public int XOffset { get { return this.xOffset; } set { this.xOffset = value; } } #endregion #region Y 오프셋 - YOffset /// <summary> /// Y 오프셋 /// </summary> public int YOffset { get { return this.yOffset; } set { this.yOffset = value; } } #endregion #region 청색 - Blue /// <summary> /// 청색 /// </summary> public byte Blue { get { return this.blue; } set { this.blue = value; } } #endregion #region 녹색 - Green /// <summary> /// 녹색 /// </summary> public byte Green { get { return this.green; } set { this.green = value; } } #endregion #region 적색 - Red /// <summary> /// 적색 /// </summary> public byte Red { get { return this.red; } set { this.red = value; } } #endregion } } |
▶ VoronoiPoint.cs
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using System.Collections.Generic; namespace TestProject { /// <summary> /// 보로노이 포인트 /// </summary> public class VoronoiPoint { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 픽셀 리스트 /// </summary> private List<Pixel> pixelList = new List<Pixel>(); /// <summary> /// X 오프셋 /// </summary> private int xOffset = 0; /// <summary> /// Y 오프셋 /// </summary> private int yOffset = 0; /// <summary> /// 청색 합계 /// </summary> private int blueTotal = 0; /// <summary> /// 녹색 합계 /// </summary> private int greenTotal = 0; /// <summary> /// 적색 합계 /// </summary> private int redTotal = 0; /// <summary> /// 청색 평균 /// </summary> private int blueAverage = 0; /// <summary> /// 녹색 평균 /// </summary> private int greenAverage = 0; /// <summary> /// 적색 평균 /// </summary> private int redAverage = 0; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 픽셀 리스트 - PixelList /// <summary> /// 픽셀 리스트 /// </summary> public List<Pixel> PixelList { get { return this.pixelList; } } #endregion #region X 오프셋 - XOffset /// <summary> /// X 오프셋 /// </summary> public int XOffset { get { return this.xOffset; } set { this.xOffset = value; } } #endregion #region Y 오프셋 - YOffset /// <summary> /// Y 오프셋 /// </summary> public int YOffset { get { return this.yOffset; } set { this.yOffset = value; } } #endregion #region 청색 합계 - BlueTotal /// <summary> /// 청색 합계 /// </summary> public int BlueTotal { get { return this.blueTotal; } set { this.blueTotal = value; } } #endregion #region 녹색 합계 - GreenTotal /// <summary> /// 녹색 합계 /// </summary> public int GreenTotal { get { return this.greenTotal; } set { this.greenTotal = value; } } #endregion #region 적색 합계 - RedTotal /// <summary> /// 적색 합계 /// </summary> public int RedTotal { get { return this.redTotal; } set { this.redTotal = value; } } #endregion #region 청색 평균 - BlueAverage /// <summary> /// 청색 평균 /// </summary> public int BlueAverage { get { return this.blueAverage; } } #endregion #region 녹색 평균 - GreenAverage /// <summary> /// 녹색 평균 /// </summary> public int GreenAverage { get { return this.greenAverage; } } #endregion #region 적색 평균 - RedAverage /// <summary> /// 적색 평균 /// </summary> public int RedAverage { get { return this.redAverage; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 픽셀 추가하기 - AddPixel(pixel) /// <summary> /// 픽셀 추가하기 /// </summary> /// <param name="pixel">픽셀</param> public void AddPixel(Pixel pixel) { this.blueTotal += pixel.Blue; this.greenTotal += pixel.Green; this.redTotal += pixel.Red; this.pixelList.Add(pixel); } #endregion #region 평균 계산하기 - CalculateAverage() /// <summary> /// 평균 계산하기 /// </summary> public void CalculateAverage() { if(this.pixelList.Count > 0) { this.blueAverage = this.blueTotal / this.pixelList.Count; this.greenAverage = this.greenTotal / this.pixelList.Count; this.redAverage = this.redTotal / this.pixelList.Count; } } #endregion } } |
▶ BitmapHelper.cs
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using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.Linq; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 제곱근 딕셔너리 /// </summary> private static Dictionary <int, int> _squareRootDictionary = new Dictionary<int, int>(); #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 스테인 글라스 필터 적용하기 - ApplyStainedGlassFilter(sourceBitmap, blockSize, blockFactor, distanceType, highlightEdge, edgeThreshold, edgeColor) /// <summary> /// 스테인 글라스 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="blockSize">블럭 크기</param> /// <param name="blockFactor">블럭 팩터</param> /// <param name="distanceType">거리 타입</param> /// <param name="highlightEdge">가장자리 강조 여부</param> /// <param name="edgeThreshold">가장자리 임계치</param> /// <param name="edgeColor">가장자리 색상</param> /// <returns>비트맵</returns> public static Bitmap ApplyStainedGlassFilter ( Bitmap sourceBitmap, int blockSize, double blockFactor, DistanceType distanceType, bool highlightEdge, byte edgeThreshold, Color edgeColor ) { 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 neighbourHoodTotal = 0; int sourceOffset = 0; int targetOffset = 0; int currentPixelDistance = 0; int nearestPixelDistance = 0; int nearestPointIndex = 0; Random random = new Random(); List<VoronoiPoint> randomPointList = new List<VoronoiPoint>(); for(int row = 0; row < sourceBitmap.Height - blockSize; row += blockSize) { for(int column = 0; column < sourceBitmap.Width - blockSize; column += blockSize) { sourceOffset = row * sourceBitmapData.Stride + column * 4; neighbourHoodTotal = 0; for(int y = 0; y < blockSize; y++) { for(int x = 0; x < blockSize; x++) { targetOffset = sourceOffset + y * sourceBitmapData.Stride + x * 4; neighbourHoodTotal += sourceByteArray[targetOffset ]; neighbourHoodTotal += sourceByteArray[targetOffset + 1]; neighbourHoodTotal += sourceByteArray[targetOffset + 2]; } } random = new Random(neighbourHoodTotal); VoronoiPoint randomPoint = new VoronoiPoint(); randomPoint.XOffset = random.Next(0, blockSize) + column; randomPoint.YOffset = random.Next(0, blockSize) + row; randomPointList.Add(randomPoint); } } int rowOffset = 0; int columnOffset = 0; for(int bufferOffset = 0; bufferOffset < sourceByteArray.Length - 4; bufferOffset += 4) { rowOffset = bufferOffset / sourceBitmapData.Stride; columnOffset = (bufferOffset % sourceBitmapData.Stride) / 4; currentPixelDistance = 0; nearestPixelDistance = blockSize * 4; nearestPointIndex = 0; List<VoronoiPoint> subsidaryPointList = new List<VoronoiPoint>(); subsidaryPointList.AddRange ( from randomPoint in randomPointList where rowOffset >= randomPoint.YOffset - blockSize * 2 && rowOffset <= randomPoint.YOffset + blockSize * 2 select randomPoint ); for(int k = 0; k < subsidaryPointList.Count; k++) { if(distanceType == DistanceType.Euclidean) { currentPixelDistance = CalculateDistanceEuclidean ( subsidaryPointList[k].XOffset, columnOffset, subsidaryPointList[k].YOffset, rowOffset ); } else if(distanceType == DistanceType.Manhattan) { currentPixelDistance = CalculateDistanceManhattan ( subsidaryPointList[k].XOffset, columnOffset, subsidaryPointList[k].YOffset, rowOffset ); } else if(distanceType == DistanceType.Chebyshev) { currentPixelDistance = CalculateDistanceChebyshev ( subsidaryPointList[k].XOffset, columnOffset, subsidaryPointList[k].YOffset, rowOffset ); } if(currentPixelDistance <= nearestPixelDistance) { nearestPixelDistance = currentPixelDistance; nearestPointIndex = k; if(nearestPixelDistance <= blockSize / blockFactor) { break; } } } Pixel pixel = new Pixel (); pixel.XOffset = columnOffset; pixel.YOffset = rowOffset; pixel.Blue = sourceByteArray[bufferOffset ]; pixel.Green = sourceByteArray[bufferOffset + 1]; pixel.Red = sourceByteArray[bufferOffset + 2]; subsidaryPointList[nearestPointIndex].AddPixel(pixel); } for(int k = 0; k < randomPointList.Count; k++) { randomPointList[k].CalculateAverage(); for(int i = 0; i < randomPointList[k].PixelList.Count; i++) { targetOffset = randomPointList[k].PixelList[i].YOffset * sourceBitmapData.Stride + randomPointList[k].PixelList[i].XOffset * 4; targetByteArray[targetOffset ] = (byte)randomPointList[k].BlueAverage; targetByteArray[targetOffset + 1] = (byte)randomPointList[k].GreenAverage; targetByteArray[targetOffset + 2] = (byte)randomPointList[k].RedAverage; 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); if(highlightEdge == true ) { targetBitmap = ApplyGradientBasedEdgeDetectionFilter(targetBitmap, edgeColor, edgeThreshold); } return targetBitmap; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 유클리드 거리 계산하기 - CalculateDistanceEuclidean(x1, x2, y1, y2) /// <summary> /// 유클리드 거리 계산하기 /// </summary> /// <param name="x1">X1</param> /// <param name="x2">Y1</param> /// <param name="y1">X2</param> /// <param name="y2">Y2</param> /// <returns>거리</returns> private static int CalculateDistanceEuclidean(int x1, int x2, int y1, int y2) { int square = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2); if(_squareRootDictionary.ContainsKey(square) == false) { _squareRootDictionary.Add(square, (int)Math.Sqrt(square)); } return _squareRootDictionary[square]; } #endregion #region 맨하탄 거리 계산하기 - CalculateDistanceManhattan(x1, x2, y1, y2) /// <summary> /// 맨하탄 거리 계산하기 /// </summary> /// <param name="x1">X1</param> /// <param name="x2">Y1</param> /// <param name="y1">X2</param> /// <param name="y2">Y2</param> /// <returns>거리</returns> private static int CalculateDistanceManhattan(int x1, int x2, int y1, int y2) { return Math.Abs(x1 - x2) + Math.Abs(y1 - y2); } #endregion #region 체비쇼프 거리 계산하기 - CalculateDistanceChebyshev(x1, x2, y1, y2) /// <summary> /// 체비쇼프 거리 계산하기 /// </summary> /// <param name="x1">X1</param> /// <param name="x2">Y1</param> /// <param name="y1">X2</param> /// <param name="y2">Y2</param> /// <returns>거리</returns> private static int CalculateDistanceChebyshev(int x1, int x2, int y1, int y2) { return Math.Max(Math.Abs(x1 - x2), Math.Abs(y1 - y2)); } #endregion #region 임계치 체크하기 - CheckThreshold(sourceByteArray, offset1, offset2, gradientValue, threshold, divideBy) /// <summary> /// 임계치 체크하기 /// </summary> /// <param name="sourceByteArray">소스 바이트 배열</param> /// <param name="offset1">오프셋 1</param> /// <param name="offset2">오프셋 2</param> /// <param name="gradientValue">그라디언트 값</param> /// <param name="threshold">임계치</param> /// <param name="divideBy">젯수</param> /// <returns>임계치 체크 결과</returns> private static bool CheckThreshold ( byte[] sourceByteArray, int offset1, int offset2, ref int gradientValue, byte threshold, int divideBy = 1 ) { gradientValue += Math.Abs(sourceByteArray[offset1 ] - sourceByteArray[offset2 ]) / divideBy; gradientValue += Math.Abs(sourceByteArray[offset1 + 1] - sourceByteArray[offset2 + 1]) / divideBy; gradientValue += Math.Abs(sourceByteArray[offset1 + 2] - sourceByteArray[offset2 + 2]) / divideBy; return (gradientValue >= threshold); } #endregion #region 그라디언트 기반 가장자리 탐지 필터 적용하기 - ApplyGradientBasedEdgeDetectionFilter(sourceBitmap, edgeColor, threshold) /// <summary> /// 그라디언트 기반 가장자리 탐지 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="edgeColor">가장자리 색상</param> /// <param name="threshold">임계치</param> /// <returns>비트맵</returns> private static Bitmap ApplyGradientBasedEdgeDetectionFilter(Bitmap sourceBitmap, Color edgeColor, 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); Marshal.Copy(sourceBitmapData.Scan0, targetByteArray, 0, targetByteArray.Length); sourceBitmap.UnlockBits(sourceBitmapData); int sourceOffset = 0; int gradientValue = 0; bool exceedThreshold = false; for(int offsetY = 1; offsetY < sourceBitmap.Height - 1; offsetY++) { for(int offsetX = 1; offsetX < sourceBitmap.Width - 1; offsetX++) { sourceOffset = offsetY * sourceBitmapData.Stride + offsetX * 4; gradientValue = 0; exceedThreshold = true; CheckThreshold ( sourceByteArray, sourceOffset - 4, sourceOffset + 4, ref gradientValue, threshold, 2 ); exceedThreshold = CheckThreshold ( sourceByteArray, sourceOffset - sourceBitmapData.Stride, sourceOffset + sourceBitmapData.Stride, ref gradientValue, threshold, 2 ); if(exceedThreshold == false) { gradientValue = 0; exceedThreshold = CheckThreshold ( sourceByteArray, sourceOffset - 4, sourceOffset + 4, ref gradientValue, threshold ); if(exceedThreshold == false) { gradientValue = 0; exceedThreshold = CheckThreshold ( sourceByteArray, sourceOffset - sourceBitmapData.Stride, sourceOffset + sourceBitmapData.Stride, ref gradientValue, threshold ); if(exceedThreshold == false) { gradientValue = 0; CheckThreshold ( sourceByteArray, sourceOffset - 4 - sourceBitmapData.Stride, sourceOffset + 4 + sourceBitmapData.Stride, ref gradientValue, threshold, 2 ); exceedThreshold = CheckThreshold ( sourceByteArray, sourceOffset - sourceBitmapData.Stride + 4, sourceOffset - 4 + sourceBitmapData.Stride, ref gradientValue, threshold, 2 ); if(exceedThreshold == false) { gradientValue = 0; exceedThreshold = CheckThreshold ( sourceByteArray, sourceOffset - 4 - sourceBitmapData.Stride, sourceOffset + 4 + sourceBitmapData.Stride, ref gradientValue, threshold ); if(exceedThreshold == false) { gradientValue = 0; exceedThreshold = CheckThreshold ( sourceByteArray, sourceOffset - sourceBitmapData.Stride + 4, sourceOffset + sourceBitmapData.Stride - 4, ref gradientValue, threshold ); } } } } } if(exceedThreshold == true) { targetByteArray[sourceOffset ] = edgeColor.B; targetByteArray[sourceOffset + 1] = edgeColor.G; targetByteArray[sourceOffset + 2] = edgeColor.R; } targetByteArray[sourceOffset + 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.ApplyStainedGlassFilter ( sourceBitmap, 20, 10, DistanceType.Euclidean, true, 1, Color.Black ); this.pictureBox.SizeMode = PictureBoxSizeMode.Zoom; this.pictureBox.Image = targetBitmap; } #endregion } } |
