■ 이미지에서 윤곽선을 검출하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Runtime.InteropServices; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 이용 가능한 픽셀 포맷 /// </summary> private const PixelFormat AVAILABLE_PIXEL_FORMAT = PixelFormat.Format24bppRgb; /// <summary> /// 소스 비트맵 /// </summary> private Bitmap sourceBitmap; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); #region 이벤트를 설정한다. this.sourcePanel.Click += sourcePanel_Click; this.sourcePictureBox.Click += sourcePictureBox_Click; this.targetPanel.Click += targetPanel_Click; this.targetPictureBox.Click += targetPictureBox_Click; this.brightnessLowerLimitNumericUpDown.ValueChanged += brightnessLowerLimitNumericUpDown_ValueChanged; this.brightnessUpperLimitNumericUpDown.ValueChanged += brightnessUpperLimitNumericUpDown_ValueChanged; this.rgbRadioButton.CheckedChanged += rgbRadioButton_CheckedChanged; this.blackWhiteRadioButton.CheckedChanged += blackWhiteRadioButton_CheckedChanged; this.grayscaleRadioButton.CheckedChanged += grayscaleRadioButton_CheckedChanged; this.invertEdgeColorCheckBox.CheckedChanged += invertEdgeColorCheckBox_CheckedChanged; #endregion } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 소스 패널 클릭시 처리하기 - sourcePanel_Click(sender, e) /// <summary> /// 소스 패널 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void sourcePanel_Click(object sender, EventArgs e) { LoadSourceImage(); } #endregion #region 소스 픽처 박스 클릭시 처리하기 - sourcePictureBox_Click(sender, e) /// <summary> /// 소스 픽처 박스 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void sourcePictureBox_Click(object sender, EventArgs e) { LoadSourceImage(); } #endregion #region 타겟 패널 클릭시 처리하기 - targetPanel_Click(sender, e) /// <summary> /// 타겟 패널 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void targetPanel_Click(object sender, EventArgs e) { SaveTargetImage(); } #endregion #region 타겟 픽처 박스 클릭시 처리하기 - targetPictureBox_Click(sender, e) /// <summary> /// 타겟 픽처 박스 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void targetPictureBox_Click(object sender, EventArgs e) { SaveTargetImage(); } #endregion #region 명도 하한 숫자 UP/DOWN 값 변경시 처리하기 - brightnessLowerLimitNumericUpDown_ValueChanged(sender, e) /// <summary> /// 명도 하한 숫자 UP/DOWN 값 변경시 처리하기 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void brightnessLowerLimitNumericUpDown_ValueChanged(object sender, EventArgs e) { ProcessImage(); } #endregion #region 명도 상한 숫자 UP/DOWN 값 변경시 처리하기 - brightnessLowerLimitNumericUpDown_ValueChanged(sender, e) /// <summary> /// 명도 상한 숫자 UP/DOWN 값 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void brightnessUpperLimitNumericUpDown_ValueChanged(object sender, EventArgs e) { ProcessImage(); } #endregion #region RGB 색상 라디오 버튼 체크 변경시 처리하기 - rgbRadioButton_CheckedChanged(sender, e) /// <summary> /// RGB 색상 라디오 버튼 체크 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void rgbRadioButton_CheckedChanged(object sender, EventArgs e) { if(this.rgbRadioButton.Checked) { ProcessImage(); } } #endregion #region 흑백 색상 라디오 버튼 체크 변경시 처리하기 - blackWhiteRadioButton_CheckedChanged(sender, e) /// <summary> /// 흑백 색상 라디오 버튼 체크 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void blackWhiteRadioButton_CheckedChanged(object sender, EventArgs e) { if(this.blackWhiteRadioButton.Checked) { ProcessImage(); } } #endregion #region 회색조 색상 라디오 버튼 체크 변경시 처리하기 - grayscaleRadioButton_CheckedChanged(sender, e) /// <summary> /// 회색조 색상 라디오 버튼 체크 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void grayscaleRadioButton_CheckedChanged(object sender, EventArgs e) { if(this.grayscaleRadioButton.Checked) { ProcessImage(); } } #endregion #region 윤곽선 색상 반전 체크 박스 체크 변경시 처리하기 - invertEdgeColorCheckBox_CheckedChanged(sender, e) /// <summary> /// 윤곽선 색상 반전 체크 박스 체크 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void invertEdgeColorCheckBox_CheckedChanged(object sender, EventArgs e) { ProcessImage(); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 소스 이미지 로드하기 - LoadSourceImage() /// <summary> /// 소스 이미지 로드하기 /// </summary> private void LoadSourceImage() { if(this.openFileDialog.ShowDialog() != DialogResult.OK) { return; } this.sourceBitmap = new Bitmap(this.openFileDialog.FileName); if(this.sourceBitmap != null && this.sourceBitmap.PixelFormat == AVAILABLE_PIXEL_FORMAT) { this.sourcePictureBox.Image = this.sourceBitmap; DetectImageContour(); } else { this.sourceBitmap = null; } } #endregion #region 타겟 이미지 저장하기 - SaveTargetImage() /// <summary> /// 타겟 이미지 저장하기 /// </summary> private void SaveTargetImage() { if(this.targetPictureBox.Image == null) { return; } if(this.saveFileDialog.ShowDialog() != DialogResult.OK) { return; } if(this.saveFileDialog.FileName == this.openFileDialog.FileName) { return; } string fileExtension = new FileInfo(openFileDialog.FileName).Extension; switch(fileExtension) { case ".bmp" : { this.targetPictureBox.Image.Save(saveFileDialog.FileName,ImageFormat.Bmp); break; } case ".jpg" : case ".jpeg" : { this.targetPictureBox.Image.Save(saveFileDialog.FileName,ImageFormat.Jpeg); break; } default : { this.targetPictureBox.Image.Save(saveFileDialog.FileName,ImageFormat.Png); break; } } } #endregion #region 이미지 윤곽선 탐지하기 - DetectImageContour() /// <summary> /// 이미지 윤곽선 탐지하기 /// </summary> private void DetectImageContour() { Bitmap targetBitmap = (Bitmap)sourceBitmap.Clone(); int targetBitmapWidth = targetBitmap.Width; int targetBitmapHeight = targetBitmap.Height; Rectangle targetRectangle = new Rectangle(0, 0, targetBitmapWidth, targetBitmapHeight); BitmapData targetBitmapData = targetBitmap.LockBits(targetRectangle, ImageLockMode.ReadWrite, targetBitmap.PixelFormat); IntPtr targetBitmapHandle = targetBitmapData.Scan0; int totalPixelCount = targetBitmapWidth * targetBitmapHeight; int totalByteCount = totalPixelCount * 3; int totalByteCountPerLine = targetBitmapData.Stride; int actualByteCountPerLine = targetBitmapWidth * 3; int alignmentByteCount = totalByteCountPerLine - actualByteCountPerLine; totalByteCount += targetBitmapHeight * alignmentByteCount; byte[] sourceRGBArray = new byte[totalByteCount]; Marshal.Copy(targetBitmapHandle, sourceRGBArray, 0, totalByteCount); byte[,,] targetRGBArray = new byte[targetBitmapWidth, targetBitmapHeight, 3]; float[,] targetBrightnessArray = new float[targetBitmapWidth,targetBitmapHeight]; int sourceIndex = 0; for(int y = 0; y < targetBitmapHeight; y++) { for(int x = 0; x < targetBitmapWidth; x++) { targetRGBArray[x, y, 0] = sourceRGBArray[sourceIndex + 2]; // Red targetRGBArray[x, y, 1] = sourceRGBArray[sourceIndex + 1]; // Green targetRGBArray[x, y, 2] = sourceRGBArray[sourceIndex + 0]; // Blue targetBrightnessArray[x, y] = Color.FromArgb ( sourceRGBArray[sourceIndex + 2], sourceRGBArray[sourceIndex + 1], sourceRGBArray[sourceIndex + 0] ).GetBrightness(); sourceIndex += 3; } sourceIndex += alignmentByteCount; } float lowerLimit = (float)this.brightnessLowerLimitNumericUpDown.Value; float upperLimit = (float)this.brightnessUpperLimitNumericUpDown.Value; float maximumValue = 0; for(int y = 1; y < targetBitmapHeight - 1; y++) { for(int x = 1; x < targetBitmapWidth - 1; x++) { maximumValue = Math.Abs(targetBrightnessArray[x - 1, y - 1] - targetBrightnessArray[x + 1, y + 1]); if(maximumValue < Math.Abs(targetBrightnessArray[x - 1, y + 1] - targetBrightnessArray[x + 1, y - 1])) { maximumValue = Math.Abs(targetBrightnessArray[x - 1, y + 1] - targetBrightnessArray[x + 1, y - 1]); } if(maximumValue < Math.Abs(targetBrightnessArray[x, y + 1] - targetBrightnessArray[x, y - 1])) { maximumValue = Math.Abs(targetBrightnessArray[x, y + 1] - targetBrightnessArray[x, y - 1]); } if(maximumValue < Math.Abs(targetBrightnessArray[x - 1, y] - targetBrightnessArray[x + 1, y])) { maximumValue = Math.Abs(targetBrightnessArray[x - 1, y] - targetBrightnessArray[x + 1, y]); } if(this.invertEdgeColorCheckBox.Checked) { if(maximumValue < lowerLimit) { targetRGBArray[x, y, 0] = (byte)255; targetRGBArray[x, y, 1] = (byte)255; targetRGBArray[x, y, 2] = (byte)255; } else if(maximumValue > upperLimit) { targetRGBArray[x, y, 0] = (byte)0; targetRGBArray[x, y, 1] = (byte)0; targetRGBArray[x, y, 2] = (byte)0; } } else { if(maximumValue < lowerLimit) { targetRGBArray[x ,y, 0] = (byte)0; targetRGBArray[x ,y, 1] = (byte)0; targetRGBArray[x ,y, 2] = (byte)0; } else if(maximumValue>upperLimit) { targetRGBArray[x, y, 0] = (byte)255; targetRGBArray[x, y, 1] = (byte)255; targetRGBArray[x, y, 2] = (byte)255; } } } } if(this.blackWhiteRadioButton.Checked) { for(int y = 1; y < targetBitmapHeight - 1; y++) { for(int x = 1; x < targetBitmapWidth - 1; x++) { if(this.invertEdgeColorCheckBox.Checked) { if(targetRGBArray[x, y, 0] < 255 || targetRGBArray[x, y, 1] < 255 || targetRGBArray[x, y, 2] < 255) { targetRGBArray[x, y, 0] = targetRGBArray[x, y, 1] = targetRGBArray[x, y, 2] = (byte)0; } } else { if(targetRGBArray[x, y, 0] > 0 || targetRGBArray[x, y, 1] > 0 || targetRGBArray[x, y, 2] > 0) { targetRGBArray[x, y, 0] = targetRGBArray[x, y, 1] = targetRGBArray[x, y, 2] = (byte)255; } } } } } if(this.grayscaleRadioButton.Checked) { for(int y = 1; y < targetBitmapHeight - 1; y++) { for(int x = 1; x < targetBitmapWidth - 1; x++) { byte brightness = (byte)((0.299 * targetRGBArray[x, y, 0]) + (0.587 * targetRGBArray[x, y, 1]) + (0.114 * targetRGBArray[x, y, 2])); targetRGBArray[x, y, 0] = targetRGBArray[x, y, 1] = targetRGBArray[x, y, 2] = brightness; } } } sourceIndex = 0; for(int y = 0; y < targetBitmapHeight; y++) { for(int x = 0; x < targetBitmapWidth; x++) { sourceRGBArray[sourceIndex + 2] = targetRGBArray[x, y, 0]; // Red sourceRGBArray[sourceIndex + 1] = targetRGBArray[x, y, 1]; // Green sourceRGBArray[sourceIndex + 0] = targetRGBArray[x, y, 2]; // Blue sourceIndex += 3; } sourceIndex += alignmentByteCount; } Marshal.Copy(sourceRGBArray, 0, targetBitmapHandle, totalByteCount); targetBitmap.UnlockBits(targetBitmapData); this.targetPictureBox.Image = targetBitmap; } #endregion #region 이미지 처리하기 - ProcessImage() /// <summary> /// 이미지 처리하기 /// </summary> private void ProcessImage() { if(this.sourceBitmap != null) { DetectImageContour(); } } #endregion } } |
