■ 비트맵 이진화를 적용하는 방법을 보여준다.
▶ BitmapHelper.cs
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using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// 비트맵 헬퍼 /// </summary> public class BitmapHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 이미지 바이트 배열 /// </summary> public byte[] ImageByteArray; /// <summary> /// 행 크기 바이트 수 /// </summary> public int RowSizeByteCount; /// <summary> /// 픽셀 데이터 크기 /// </summary> public const int PixelDataSize = 32; #endregion ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 비트맵 /// </summary> private Bitmap bitmap; /// <summary> /// 비트맵 데이터 /// </summary> private BitmapData bitmapData; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 너비 - Width /// <summary> /// 너비 /// </summary> public int Width { get { return this.bitmap.Width; } } #endregion #region 높이 - Height /// <summary> /// 높이 /// </summary> public int Height { get { return this.bitmap.Height; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - BitmapHelper(bitmap) /// <summary> /// 생성자 /// </summary> /// <param name="bitmap">비트맵</param> public BitmapHelper(Bitmap bitmap) { this.bitmap = bitmap; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 비트맵 잠그기 - LockBitmap() /// <summary> /// 비트맵 잠그기 /// </summary> public void LockBitmap() { Rectangle boundRectangle = new Rectangle(0, 0, this.bitmap.Width, this.bitmap.Height); this.bitmapData = this.bitmap.LockBits ( boundRectangle, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb ); RowSizeByteCount = this.bitmapData.Stride; int totalSize = this.bitmapData.Stride * this.bitmapData.Height; ImageByteArray = new byte[totalSize]; Marshal.Copy(this.bitmapData.Scan0, ImageByteArray, 0, totalSize); } #endregion #region 비트맵 잠금 해제하기 - UnlockBitmap() /// <summary> /// 비트맵 잠금 해제하기 /// </summary> public void UnlockBitmap() { int totalSize = this.bitmapData.Stride * this.bitmapData.Height; Marshal.Copy(ImageByteArray, 0, this.bitmapData.Scan0, totalSize); this.bitmap.UnlockBits(this.bitmapData); ImageByteArray = null; this.bitmapData = null; } #endregion #region 픽셀 구하기 - GetPixel(x, y, red, green, blue, alpha) /// <summary> /// 픽셀 구하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="red">빨강색</param> /// <param name="green">녹색</param> /// <param name="blue">파랑색</param> /// <param name="alpha">불투명도</param> public void GetPixel(int x, int y, out byte red, out byte green, out byte blue, out byte alpha) { int i = y * this.bitmapData.Stride + x * 4; blue = ImageByteArray[i++]; green = ImageByteArray[i++]; red = ImageByteArray[i++]; alpha = ImageByteArray[i ]; } #endregion #region 픽셀 설정하기 - SetPixel(x, y, red, green, blue, alpha) /// <summary> /// 픽셀 설정하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="red">빨강색</param> /// <param name="green">녹색</param> /// <param name="blue">파랑색</param> /// <param name="alpha">불투명도</param> public void SetPixel(int x, int y, byte red, byte green, byte blue, byte alpha) { int i = y * this.bitmapData.Stride + x * 4; ImageByteArray[i++] = blue; ImageByteArray[i++] = green; ImageByteArray[i++] = red; ImageByteArray[i ] = alpha; } #endregion #region 빨강색 구하기 - GetRed(x, y) /// <summary> /// 빨강색 구하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <returns>빨강색</returns> public byte GetRed(int x, int y) { int i = y * this.bitmapData.Stride + x * 4; return ImageByteArray[i + 2]; } #endregion #region 빨강색 설정하기 - SetRed(x, y, red) /// <summary> /// 빨강색 설정하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="red">빨강색</param> public void SetRed(int x, int y, byte red) { int i = y * this.bitmapData.Stride + x * 4; ImageByteArray[i + 2] = red; } #endregion #region 녹색 구하기 - GetGreen(x, y) /// <summary> /// 녹색 구하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <returns>녹색</returns> public byte GetGreen(int x, int y) { int i = y * this.bitmapData.Stride + x * 4; return ImageByteArray[i + 1]; } #endregion #region 녹색 설정하기 - SetGreen(x, y, green) /// <summary> /// 녹색 설정하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="green">녹색</param> public void SetGreen(int x, int y, byte green) { int i = y * this.bitmapData.Stride + x * 4; ImageByteArray[i + 1] = green; } #endregion #region 파랑색 구하기 - GetBlue(x, y) /// <summary> /// 파랑색 구하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <returns>파랑색</returns> public byte GetBlue(int x, int y) { int i = y * this.bitmapData.Stride + x * 4; return ImageByteArray[i]; } #endregion #region 파랑색 설정하기 - SetBlue(x, y, blue) /// <summary> /// 파랑색 설정하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="blue">파랑색</param> public void SetBlue(int x, int y, byte blue) { int i = y * this.bitmapData.Stride + x * 4; ImageByteArray[i] = blue; } #endregion #region 붙투명도 구하기 - GetAlpha(x, y) /// <summary> /// 붙투명도 구하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <returns>불투명도</returns> public byte GetAlpha(int x, int y) { int i = y * this.bitmapData.Stride + x * 4; return ImageByteArray[i + 3]; } #endregion #region 불투명도 설정하기 - SetAlpha(x, y, alpha) /// <summary> /// 불투명도 설정하기 /// </summary> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="alpha">불투명도</param> public void SetAlpha(int x, int y, byte alpha) { int i = y * this.bitmapData.Stride + x * 4; ImageByteArray[i + 3] = alpha; } #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 { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.openMenuItem.Click += openMenuItem_Click; this.saveAsMenuItem.Click += saveAsMenuItem_Click; this.exitMenuItem.Click += exitMenuItem_Click; this.cutoffScrollBar.Scroll += cutoffScrollBar_Scroll; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 열기 메뉴 항목 클릭시 처리하기 - openMenuItem_Click(sender, e) /// <summary> /// 열기 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void openMenuItem_Click(object sender, EventArgs e) { if(this.openFileDialog.ShowDialog() == DialogResult.OK) { this.sourcePictureBox.Image = GetBitmap(this.openFileDialog.FileName); ProcessBinaryContrast(); } } #endregion #region 다른 이름으로 저장 메뉴 항목 클릭시 처리하기 - saveAsMenuItem_Click(sender, e) /// <summary> /// 다른 이름으로 저장 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void saveAsMenuItem_Click(object sender, EventArgs e) { if(this.saveFileDialog.ShowDialog() == DialogResult.OK) { SaveBitmap((Bitmap)this.targetPictureBox.Image, this.saveFileDialog.FileName); } } #endregion #region 종료 메뉴 항목 클릭시 처리하기 - exitMenuItem_Click(sender, e) /// <summary> /// 종료 메뉴 항목 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void exitMenuItem_Click(object sender, EventArgs e) { Close(); } #endregion #region 컷오프 스크롤바 스크롤시 처리하기 - cutoffScrollBar_Scroll(sender, e) /// <summary> /// 컷오프 스크롤바 스크롤시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void cutoffScrollBar_Scroll(object sender, ScrollEventArgs e) { this.cutoffValueLabel.Text = this.cutoffScrollBar.Value.ToString(); ProcessBinaryContrast(); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 비트맵 구하기 - GetBitmap(filePath) /// <summary> /// 비트맵 구하기 /// </summary> /// <param name="filePath">파일 경로</param> /// <returns>비트맵</returns> private Bitmap GetBitmap(string filePath) { using(Bitmap bitmap = new Bitmap(filePath)) { return new Bitmap(bitmap); } } #endregion #region 이진 대비 적용하기 - ApplyBinaryContrast(targetBitmap, cutoff) /// <summary> /// 이진 대비 적용하기 /// </summary> /// <param name="targetBitmap">타겟 비트맵</param> /// <param name="cutoff">컷오프</param> private void ApplyBinaryContrast(Bitmap targetBitmap, int cutoff) { BitmapHelper helper = new BitmapHelper(targetBitmap); helper.LockBitmap(); for(int y = 0; y < targetBitmap.Height; y++) { for(int x = 0; x < targetBitmap.Width; x++) { byte red; byte green; byte blue; byte alpha; helper.GetPixel(x, y, out red, out green, out blue, out alpha); if(red + green + blue > cutoff) { helper.SetPixel(x, y, 255, 255, 255, 255); } else { helper.SetPixel(x, y, 0, 0, 0, 255); } } } helper.UnlockBitmap(); } #endregion #region 이진 대비 처리하기 - ProcessBinaryContrast() /// <summary> /// 이진 대비 처리하기 /// </summary> private void ProcessBinaryContrast() { if(this.sourcePictureBox.Image == null) { return; } Cursor = Cursors.WaitCursor; Bitmap bitmap = new Bitmap(this.sourcePictureBox.Image); ApplyBinaryContrast(bitmap, 3 * this.cutoffScrollBar.Value); if(this.targetPictureBox.Image != null) { this.targetPictureBox.Image.Dispose(); } this.targetPictureBox.Image = bitmap; this.targetPictureBox.Left = this.sourcePictureBox.Right + 4; Cursor = Cursors.Default; } #endregion #region 비트맵 저장하기 - SaveBitmap(bitmap, filePath) /// <summary> /// 비트맵 저장하기 /// </summary> /// <param name="bitmap">비트맵</param> /// <param name="filePath">파일 경로</param> public void SaveBitmap(Bitmap bitmap, string filePath) { string extension = Path.GetExtension(filePath); switch(extension.ToLower()) { case ".bmp" : bitmap.Save(filePath, ImageFormat.Bmp ); break; case ".exif" : bitmap.Save(filePath, ImageFormat.Exif); break; case ".gif" : bitmap.Save(filePath, ImageFormat.Gif ); break; case ".jpg" : case ".jpeg" : bitmap.Save(filePath, ImageFormat.Jpeg); break; case ".png" : bitmap.Save(filePath, ImageFormat.Png ); break; case ".tif" : case ".tiff" : bitmap.Save(filePath, ImageFormat.Tiff); break; default : throw new NotSupportedException("Unknown file extension " + extension); } } #endregion } } |
