319 lines
10 KiB
C#
319 lines
10 KiB
C#
using System;
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using System.Drawing;
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using System.IO;
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using System.Drawing.Imaging;
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using System.Runtime.InteropServices;
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using System.Drawing.Drawing2D;
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using System.Security.Permissions;
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namespace MarketData.CNNProcessing
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{
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public class ImageHelper : IDisposable
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{
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private Bitmap bitmap = null;
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private Graphics graphics=null;
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private PointMapping pointMapping;
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private int width;
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private int height;
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public ImageHelper()
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{
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}
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public void Dispose()
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{
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if(null!=bitmap)
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{
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bitmap.Dispose();
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bitmap=null;
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}
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if(null!=graphics)
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{
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graphics.Dispose();
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graphics=null;
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}
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}
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public bool LoadImage(string pathFileName)
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{
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Stream bitmapStream = null;
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try
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{
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bitmapStream = File.Open(pathFileName,FileMode.Open);
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Image image = Image.FromStream(bitmapStream);
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bitmap=new Bitmap(image);
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width=bitmap.Width;
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height=bitmap.Height;
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return true;
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}
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catch(Exception)
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{
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return false;
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}
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finally
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{
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if(null!=bitmapStream)
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{
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bitmapStream.Close();
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bitmapStream.Dispose();
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bitmapStream.Dispose();
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}
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}
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}
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/// <summary>
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/// Resize image to given width maintaining aspect ration for height.
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/// If aspect ration is used for CNN then you will need to introduce padding. For instance 640,640 image and then paste the aspect
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/// mainained image onto that. The CNN will then have to learn that black means nothing. Resizing is the recommended way to go.
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/// </summary>
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public bool Resize(int newWidth)
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{
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double aspectRatio=(double)bitmap.Width/(double)bitmap.Height;
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int newHeight=(int)(((double)newWidth)/aspectRatio);
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if(0!=newHeight%2)newHeight++;
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return Resize(newWidth,newHeight);
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}
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/// <summary>
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/// Resize image to given width and height. The documenation on CNN's indicates that resizing will work better than maintaining apsect
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/// ration with padding
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/// </summary>
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public bool Resize(int newWidth, int newHeight)
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{
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Graphics graphics = null;
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ImageAttributes imageAttributes = null;
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try
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{
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Validate();
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Rectangle destRect=new Rectangle(0,0,newWidth,newHeight);
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Bitmap destBitmap = new Bitmap(newWidth,newHeight);
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destBitmap.SetResolution(bitmap.HorizontalResolution,bitmap.VerticalResolution);
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graphics = Graphics.FromImage(destBitmap);
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graphics.CompositingMode = CompositingMode.SourceCopy;
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graphics.CompositingQuality = CompositingQuality.HighQuality;
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graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
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graphics.SmoothingMode = SmoothingMode.HighQuality;
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graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
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imageAttributes = new ImageAttributes();
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imageAttributes.SetWrapMode(WrapMode.TileFlipXY);
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graphics.DrawImage(bitmap, destRect, 0,0, bitmap.Width, bitmap.Height, GraphicsUnit.Pixel, imageAttributes);
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bitmap.Dispose();
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bitmap=destBitmap;
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imageAttributes.Dispose();
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graphics.Dispose();
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return true;
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}
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catch(Exception)
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{
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return false;
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}
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finally
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{
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if(null!=graphics)
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{
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graphics.Dispose();
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graphics=null;
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}
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if(null!=imageAttributes)
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{
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imageAttributes.Dispose();
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imageAttributes=null;
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}
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}
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}
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/// <summary>
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/// Resize the image to the specified width and height.
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/// </summary>
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/// <param name="image">The image to resize.</param>
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/// <param name="width">The width to resize to.</param>
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/// <param name="height">The height to resize to.</param>
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/// <returns>The resized image.</returns>
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//public static Bitmap ResizeImage(Image image, int width, int height)
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//{
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// var destRect = new Rectangle(0, 0, width, height);
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// var destImage = new Bitmap(width, height);
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// destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
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// using (var graphics = Graphics.FromImage(destImage))
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// {
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// graphics.CompositingMode = CompositingMode.SourceCopy;
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// graphics.CompositingQuality = CompositingQuality.HighQuality;
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// graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
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// graphics.SmoothingMode = SmoothingMode.HighQuality;
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// graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
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// using (var wrapMode = new ImageAttributes())
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// {
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// wrapMode.SetWrapMode(WrapMode.TileFlipXY);
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// graphics.DrawImage(image, destRect, 0, 0, image.Width,image.Height, GraphicsUnit.Pixel, wrapMode);
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// }
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// }
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// return destImage;
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//}
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public void CreateImage(int width, int height,PointMapping pointMapping)
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{
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this.width=width;
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this.height=height;
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this.pointMapping=pointMapping;
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bitmap=new Bitmap(width,height,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
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Validate();
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graphics=Graphics.FromImage(bitmap);
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}
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public Stream SaveBlackAndWhiteJPG()
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{
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Validate();
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Bitmap bwBitmap=ToBlackAndWhite(bitmap);
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Stream memoryStream=new MemoryStream();
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BitmapExtensions.SaveJPG100(bwBitmap,memoryStream);
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memoryStream.Position=0;
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bwBitmap.Dispose();
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return memoryStream;
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}
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public void SaveGrayScaleJPG(String pathFileName)
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{
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Validate();
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Bitmap bwBitmap=ToBlackAndWhite(bitmap);
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Save(pathFileName,bwBitmap);
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bwBitmap.Dispose();
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}
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public void SaveBlackAndWhiteJPG(String pathFileName)
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{
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Validate();
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Bitmap bwBitmap=ToBlackAndWhite(bitmap);
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Save(pathFileName,bwBitmap);
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bwBitmap.Dispose();
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}
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public void Save(String pathFileName)
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{
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Save(pathFileName,null);
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}
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private void Save(String pathFileName,Bitmap altBitmap=null)
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{
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Validate();
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if(null==altBitmap)BitmapExtensions.SaveJPG100(bitmap,pathFileName);
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else BitmapExtensions.SaveJPG100(altBitmap,pathFileName);
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}
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// Convert to 8 bits per pixel black and white
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private Bitmap ToBlackAndWhite(Bitmap bmp)
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{
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var result = new Bitmap(bmp.Width, bmp.Height, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
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BitmapData data = result.LockBits(new Rectangle(0, 0, result.Width, result.Height), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
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byte[] bytes = new byte[data.Height * data.Stride];
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Marshal.Copy(data.Scan0, bytes, 0, bytes.Length);
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for (int y = 0; y < bmp.Height; y++)
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{
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for (int x = 0; x < bmp.Width; x++)
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{
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Color color = bmp.GetPixel(x, y);
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byte rgb = (byte)((color.R + color.G + color.B) / 3);
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if(rgb>0)rgb=255;
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bytes[y * data.Stride + x] = rgb;
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}
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}
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Marshal.Copy(bytes, 0, data.Scan0, bytes.Length);
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result.UnlockBits(data);
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return result;
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}
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// Convert to 8 bits per pixel gray scale
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private Bitmap ToGrayScale(Bitmap bmp)
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{
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var result = new Bitmap(bmp.Width, bmp.Height, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
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BitmapData data = result.LockBits(new Rectangle(0, 0, result.Width, result.Height), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
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byte[] bytes = new byte[data.Height * data.Stride];
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Marshal.Copy(data.Scan0, bytes, 0, bytes.Length);
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for (int y = 0; y < bmp.Height; y++)
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{
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for (int x = 0; x < bmp.Width; x++)
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{
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Color color = bmp.GetPixel(x, y);
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byte rgb = (byte)((color.R + color.G + color.B) / 3);
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bytes[y * data.Stride + x] = rgb;
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}
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}
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Marshal.Copy(bytes, 0, data.Scan0, bytes.Length);
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result.UnlockBits(data);
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return result;
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}
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public Color GetPixel(int x,int y)
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{
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return bitmap.GetPixel(x,y);
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}
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public void SetPixel(int x, int y,Color color)
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{
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bitmap.SetPixel(x,y,color);
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}
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public Point TranslatePoint(Point point)
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{
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return pointMapping.TranslatePoint(point);
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}
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public void Validate()
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{
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if(null==bitmap)throw new InvalidDataException("The image has not been initialized");
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}
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public int Width
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{
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get{return width;}
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}
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public int Height
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{
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get{return height;}
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}
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public void Fill(Brush brush)
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{
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Validate();
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Region region=new Region(new Rectangle(0,0,bitmap.Width,bitmap.Height));
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graphics.FillRegion(brush,region);
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}
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public void DrawPoint(Pen pen,Point drawPoint)
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{
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Validate();
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Point txPoint=pointMapping.MapPoint(drawPoint);
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graphics.DrawImage(bitmap,txPoint);
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}
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public void AddNoise(Color color,double percentDecimal)
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{
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Random random=new Random();
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int amount=(int)(percentDecimal*(Width*Height));
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for(int index=0;index<amount;index++)
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{
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int row=random.Next(Height-1);
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int col=random.Next(Width-1);
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SetPixel(row,col,color);
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}
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}
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public void DrawLine(Pen pen,Point srcPoint,Point dstPoint)
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{
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Validate();
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Point txSrcPoint=pointMapping.MapPoint(srcPoint);
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Point txDstPoint=pointMapping.MapPoint(dstPoint);
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graphics.DrawLine(pen,txSrcPoint,txDstPoint);
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}
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public void DrawPath(Pen pen,LineSegments lineSegments)
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{
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GraphicsPath graphicsPath=new GraphicsPath();
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foreach(LineSegment lineSegment in lineSegments)
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{
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graphicsPath.AddLine(pointMapping.MapPoint(lineSegment.P1),pointMapping.MapPoint(lineSegment.P2));
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}
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graphics.DrawPath(pen,graphicsPath);
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}
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public void DrawCircle(Brush brush,Point pt,float size=1.00f)
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{
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Validate();
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Point txPoint=pointMapping.MapPoint(pt);
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txPoint.X-=(int)(size/2f);
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txPoint.Y-=(int)(size/2F);
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Rectangle boundingRectangle=new Rectangle();
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boundingRectangle.X=txPoint.X;
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boundingRectangle.Y=txPoint.Y;
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boundingRectangle.Width=(int)size;
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boundingRectangle.Height=(int)size;
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graphics.FillEllipse(brush,boundingRectangle);
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}
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}
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}
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