■ Bitmap 클래스에서 이미지 추상 색상 필터를 사용하는 방법을 보여준다.
▶ ColorShiftType.cs
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namespace TestProject { /// <summary> /// 색상 시프트 타입 /// </summary> public enum ColorShiftType { /// <summary> /// 해당 무 /// </summary> None, /// <summary> /// 왼쪽 시프트 /// </summary> ShiftLeft, /// <summary> /// 오른쪽 시프트 /// </summary> ShiftRight } } |
▶ EdgeTracingType.cs
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namespace TestProject { /// <summary> /// 가장자리 추적 타입 /// </summary> public enum EdgeTracingType { /// <summary> /// 검정색 /// </summary> Black, /// <summary> /// 흰색 /// </summary> White, /// <summary> /// 1/2 강도 /// </summary> HalfIntensity, /// <summary> /// 2배 강도 /// </summary> DoubleIntensity, /// <summary> /// 색상 반전 /// </summary> ColorInversion } } |
▶ BitmapHelper.cs
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using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public static class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 복사하기 - Copy(sourceBitmap, squareSize) /// <summary> /// 복사하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="squareSize">정사각형 크기</param> /// <returns>비트맵</returns> public static Bitmap Copy(Bitmap sourceBitmap, int squareSize) { float ratio = 1.0f; int maximumSide = sourceBitmap.Width > sourceBitmap.Height ? sourceBitmap.Width : sourceBitmap.Height; ratio = (float)maximumSide / (float)squareSize; Bitmap targetBitmap; if(sourceBitmap.Width > sourceBitmap.Height) { targetBitmap = new Bitmap(squareSize, (int)(sourceBitmap.Height / ratio)); } else { targetBitmap = new Bitmap((int)(sourceBitmap.Width / ratio), squareSize); } using(Graphics targetGraphics = Graphics.FromImage(targetBitmap)) { targetGraphics.CompositingQuality = CompositingQuality.HighQuality; targetGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic; targetGraphics.PixelOffsetMode = PixelOffsetMode.HighQuality; targetGraphics.DrawImage ( sourceBitmap, new Rectangle(0, 0, targetBitmap.Width, targetBitmap.Height), new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), GraphicsUnit.Pixel ); targetGraphics.Flush(); } return targetBitmap; } #endregion #region 바이트 배열 구하기 - GetByteArray(sourceBitmap) /// <summary> /// 바이트 배열 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <returns>바이트 배열</returns> public static byte[] GetByteArray(Bitmap sourceBitmap) { BitmapData sourceBitmapData = sourceBitmap.LockBits ( new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb ); byte[] targetByteArray = new byte[sourceBitmapData.Stride * sourceBitmapData.Height]; Marshal.Copy(sourceBitmapData.Scan0, targetByteArray, 0, targetByteArray.Length); sourceBitmap.UnlockBits(sourceBitmapData); return targetByteArray; } #endregion #region 평균 색상 필터 적용하기 - ApplyAverageColorFilter(sourceBitmap, matrixSize, applyBlue, applyGreen, applyRed, colorShiftType) /// <summary> /// 평균 색상 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="matrixSize">매트릭스 크기</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="colorShiftType">색상 시프트 타입</param> /// <returns>비트맵</returns> public static Bitmap ApplyAverageColorFilter ( Bitmap sourceBitmap, int matrixSize, bool applyBlue = true, bool applyGreen = true, bool applyRed = true, ColorShiftType colorShiftType = ColorShiftType.None ) { byte[] sourceByteArray = GetByteArray(sourceBitmap); byte[] targetByteArray = new byte[sourceByteArray.Length]; int sourceOffset = 0; int targetOffset = 0; int blue = 0; int green = 0; int red = 0; int filterOffset = (matrixSize - 1) / 2; for(int offsetY = filterOffset; offsetY < sourceBitmap.Height - filterOffset; offsetY++) { for(int offsetX = filterOffset; offsetX < sourceBitmap.Width - filterOffset; offsetX++) { targetOffset = offsetY * sourceBitmap.Width * 4 + offsetX * 4; blue = 0; green = 0; red = 0; for(int filterY = -filterOffset; filterY <= filterOffset; filterY++) { for(int filterX = -filterOffset; filterX <= filterOffset; filterX++) { sourceOffset = targetOffset + (filterX * 4) + (filterY * sourceBitmap.Width * 4); blue += sourceByteArray[sourceOffset ]; green += sourceByteArray[sourceOffset + 1]; red += sourceByteArray[sourceOffset + 2]; } } blue = blue / matrixSize; green = green / matrixSize; red = red / matrixSize; if(applyBlue == false) { blue = sourceByteArray[targetOffset]; } if(applyGreen == false) { green = sourceByteArray[targetOffset + 1]; } if(applyRed == false) { red = sourceByteArray[targetOffset + 2]; } if(colorShiftType == ColorShiftType.None) { targetByteArray[targetOffset ] = (byte)blue; targetByteArray[targetOffset + 1] = (byte)green; targetByteArray[targetOffset + 2] = (byte)red; targetByteArray[targetOffset + 3] = 255; } else if(colorShiftType == ColorShiftType.ShiftLeft) { targetByteArray[targetOffset ] = (byte)green; targetByteArray[targetOffset + 1] = (byte)red; targetByteArray[targetOffset + 2] = (byte)blue; targetByteArray[targetOffset + 3] = 255; } else if(colorShiftType == ColorShiftType.ShiftRight) { targetByteArray[targetOffset ] = (byte)red; targetByteArray[targetOffset + 1] = (byte)blue; targetByteArray[targetOffset + 2] = (byte)green; 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 이미지 추상 색상 필터 적용하기 - ApplyImageAbstractColorFilter(sourceBitmap, matrixSize, edgeThreshold, applyBlue, applyGreen, applyRed, edgeTracingType, colorShiftType) /// <summary> /// 이미지 추상 색상 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="matrixSize">매트릭스 크기</param> /// <param name="edgeThreshold">가장자리 임계치</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="edgeTracingType">가장자리 추적 타입</param> /// <param name="colorShiftType">색상 시프트 타입</param> /// <returns>비트맵</returns> public static Bitmap ApplyImageAbstractColorFilter ( Bitmap sourceBitmap, int matrixSize, byte edgeThreshold, bool applyBlue = true, bool applyGreen = true, bool applyRed = true, EdgeTracingType edgeTracingType = EdgeTracingType.Black, ColorShiftType colorShiftType = ColorShiftType.None ) { Bitmap edgeBitmap = ApplyGradientBasedEdgeDetectionFilter(sourceBitmap, edgeThreshold); Bitmap colorBitmap = ApplyAverageColorFilter ( sourceBitmap, matrixSize, applyBlue, applyGreen, applyRed, colorShiftType ); byte[] edgeByteArray = GetByteArray(edgeBitmap); byte[] colorByteArray = GetByteArray(colorBitmap); byte[] targetByteArray = GetByteArray(colorBitmap); for(int k = 0; k + 4 < edgeByteArray.Length; k += 4) { if(edgeByteArray[k] == 255) { switch(edgeTracingType) { case EdgeTracingType.Black: targetByteArray[k ] = 0; targetByteArray[k + 1] = 0; targetByteArray[k + 2] = 0; break; case EdgeTracingType.White : targetByteArray[k ] = 255; targetByteArray[k + 1] = 255; targetByteArray[k + 2] = 255; break; case EdgeTracingType.HalfIntensity : targetByteArray[k ] = ClipByte(targetByteArray[k ] * 0.5); targetByteArray[k + 1] = ClipByte(targetByteArray[k + 1] * 0.5); targetByteArray[k + 2] = ClipByte(targetByteArray[k + 2] * 0.5); break; case EdgeTracingType.DoubleIntensity : targetByteArray[k ] = ClipByte(targetByteArray[k ] * 2); targetByteArray[k + 1] = ClipByte(targetByteArray[k + 1] * 2); targetByteArray[k + 2] = ClipByte(targetByteArray[k + 2] * 2); break; case EdgeTracingType.ColorInversion : targetByteArray[k ] = ClipByte(255 - targetByteArray[k ]); targetByteArray[k + 1] = ClipByte(255 - targetByteArray[k + 1]); targetByteArray[k + 2] = ClipByte(255 - targetByteArray[k + 2]); break; } } } 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 //////////////////////////////////////////////////////////////////////////////// Private #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 탐지 필터 적용하기 - ApplyGradientBasedEdgeDetectionFilter(sourceBitmap, threshold) /// <summary> /// 그라디언트 기반 탐지 필터 적용하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="threshold">임계치</param> /// <returns>비트맵</returns> public static Bitmap ApplyGradientBasedEdgeDetectionFilter(Bitmap sourceBitmap, 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 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 ); } } } } } targetByteArray[sourceOffset ] = (byte)(exceedThreshold ? 255 : 0); targetByteArray[sourceOffset + 1] = targetByteArray[sourceOffset]; targetByteArray[sourceOffset + 2] = targetByteArray[sourceOffset]; 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 #region 바이트 자르기 - ClipByte(value) /// <summary> /// 바이트 자르기 /// </summary> /// <param name="value">값</param> /// <returns>바이트</returns> private static byte ClipByte(double value) { return (byte)(value > 255 ? 255 : (value < 0 ? 0 : value)); } #endregion } } |
▶ MainForm.cs
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using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 소스 비트맵 /// </summary> private Bitmap sourceBitmap = null; /// <summary> /// 미리보기 비트맵 /// </summary> private Bitmap previewBitmap = null; /// <summary> /// 타겟 비트맵 /// </summary> private Bitmap targetBitmap = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.filterSizeComboBox.SelectedIndex = 0; this.colorShiftTypeComboBox.Items.Add(ColorShiftType.None ); this.colorShiftTypeComboBox.Items.Add(ColorShiftType.ShiftLeft ); this.colorShiftTypeComboBox.Items.Add(ColorShiftType.ShiftRight); this.colorShiftTypeComboBox.SelectedIndex = 0; this.edgeTracingTypeComboBox.Items.Add(EdgeTracingType.Black ); this.edgeTracingTypeComboBox.Items.Add(EdgeTracingType.DoubleIntensity); this.edgeTracingTypeComboBox.Items.Add(EdgeTracingType.HalfIntensity ); this.edgeTracingTypeComboBox.Items.Add(EdgeTracingType.ColorInversion ); this.edgeTracingTypeComboBox.Items.Add(EdgeTracingType.White ); this.edgeTracingTypeComboBox.SelectedIndex = 0; this.applyRedCheckBox.CheckedChanged += filterValueChanged; this.applyGreenCheckBox.CheckedChanged += filterValueChanged; this.applyBlueCheckBox.CheckedChanged += filterValueChanged; this.filterSizeComboBox.SelectedIndexChanged += filterValueChanged; this.colorShiftTypeComboBox.SelectedIndexChanged += filterValueChanged; this.edgeTracingTypeComboBox.SelectedIndexChanged += filterValueChanged; this.edgeThresholdNumericUpDown.ValueChanged += filterValueChanged; this.loadImageButton.Click += loadImageButton_Click; this.saveImageButton.Click += saveImageButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 필터 값 변경시 처리하기 - filterValueChanged(sender, e) /// <summary> /// 필터 값 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void filterValueChanged(object sender, EventArgs e) { ApplyFilter(true); } #endregion #region 이미지 로드 버튼 클릭시 처리하기 - loadImageButton_Click(sender, e) /// <summary> /// 이미지 로드 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void loadImageButton_Click(object sender, EventArgs e) { OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.Title = "이미지 파일 로드"; openFileDialog.Filter = "PNG 이미지(*.png)|*.png|JPEG 이미지(*.jpg)|*.jpg|비트맵 이미지(*.bmp)|*.bmp"; if(openFileDialog.ShowDialog() == DialogResult.OK) { StreamReader reader = new StreamReader(openFileDialog.FileName); this.sourceBitmap = Bitmap.FromStream(reader.BaseStream) as Bitmap; reader.Close(); this.previewBitmap = BitmapHelper.Copy(this.sourceBitmap, this.pictureBox.Width); this.pictureBox.Image = this.previewBitmap; ApplyFilter(true); } } #endregion #region 이미지 저장 버튼 클릭시 처리하기 - saveImageButton_Click(sender, e) /// <summary> /// 이미지 저장 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void saveImageButton_Click(object sender, EventArgs e) { ApplyFilter(false); if(this.targetBitmap != null) { SaveFileDialog saveFileDialog = new SaveFileDialog(); saveFileDialog.Title = "이미지 파일 저장"; saveFileDialog.Filter = "PNG 이미지(*.png)|*.png|JPEG 이미지(*.jpg)|*.jpg|비트맵 이미지(*.bmp)|*.bmp"; if(saveFileDialog.ShowDialog() == DialogResult.OK) { string fileExtension = Path.GetExtension(saveFileDialog.FileName).ToUpper(); ImageFormat imageFormat = ImageFormat.Png; if(fileExtension == "BMP") { imageFormat = ImageFormat.Bmp; } else if(fileExtension == "JPG") { imageFormat = ImageFormat.Jpeg; } StreamWriter writer = new StreamWriter(saveFileDialog.FileName, false); this.targetBitmap.Save(writer.BaseStream, imageFormat); writer.Flush(); writer.Close(); this.targetBitmap = null; } } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 필터 적용하기 - ApplyFilter(preview) /// <summary> /// 필터 적용하기 /// </summary> /// <param name="preview">미리보기 여부</param> private void ApplyFilter(bool preview) { if(this.previewBitmap == null || this.filterSizeComboBox.SelectedIndex == -1) { return; } Bitmap sourceBitmap = null; Bitmap targetBitmap = null; if(preview == true) { sourceBitmap = this.previewBitmap; } else { sourceBitmap = this.sourceBitmap; } if(sourceBitmap != null) { if(this.filterSizeComboBox.SelectedItem.ToString() == "None") { targetBitmap = sourceBitmap; } else { int filterSize = 0; ColorShiftType colorShiftType = (ColorShiftType )this.colorShiftTypeComboBox.SelectedItem; EdgeTracingType edgeTracingType = (EdgeTracingType)this.edgeTracingTypeComboBox.SelectedItem; if(int.TryParse(this.filterSizeComboBox.SelectedItem.ToString(), out filterSize)) { targetBitmap = BitmapHelper.ApplyImageAbstractColorFilter ( sourceBitmap, filterSize, (byte)this.edgeThresholdNumericUpDown.Value, applyBlueCheckBox.Checked, applyGreenCheckBox.Checked, applyRedCheckBox.Checked, edgeTracingType, colorShiftType ); } } } if(targetBitmap != null) { if(preview == true) { this.pictureBox.Image = targetBitmap; } else { this.targetBitmap = targetBitmap; } } } #endregion } } |
