GIS笔记_普通tif文件转成array数组 c#

系统管理员 2022-12-04 07:59 16阅读 0赞

引用的库文件：

using System;
    using System.Collections;
    
    using System.Windows.Media.Imaging;
    using System.Drawing;
    using System.Drawing.Imaging;

主要功能函数 ：

public static System.Array TifToArray(string tifPath)
    {
    	//tif -> bitmap
    	Image tifImage = Image.FromFile(tifPath);
    	Bitmap bitmap = new Bitmap(tifImage);
    	int height = (int)bitmap.Height;
    	int width = (int)bitmap.Width;
    
    	System.Array pixelsArray = Array.CreateInstance(typeof(float), height, width);
    
    	GrayBitmapData grayBitmapdata = new GrayBitmapData(bitmap);
    
    	byte[,] bitData = null;
    	bitData = grayBitmapdata.GetData();
    
    	for (int i = 0; i < height; i++)
    	{
    		for (int j = 0; j < width; j++)
    		{
    			int[] indices = { i, j };
    			pixelsArray.SetValue(bitData[i, j], indices);
    		}
    	}
    
    	return pixelsArray;
    }

辅助类：

（此处假设输入的tif文件是32位的图像，format32bppArgbFlag）

class GrayBitmapData
    {
    	private byte[,] Data;
    	private int Width;
    	private int Height;
    	public GrayBitmapData()
    	{
    		this.Width = 0;
    		this.Height = 0;
    		this.Data = null;
    	}
    	public  GrayBitmapData(Bitmap bmp)
    	{
    		//from Bitmap to BitmapData
    		BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), 
    									ImageLockMode.ReadOnly, bmp.PixelFormat);
    
    		this.Width = bmpData.Width;
    		this.Height = bmpData.Height;
    		Data = new byte[Height, Width];
    		int temp = 0;
    		unsafe
    		{
    			byte* ptr = (byte*)bmpData.Scan0.ToPointer();
    			for (int i = 0; i < Height; i++)
    			{
    				for (int j = 0; j < Width; j++)
    				{
    					temp = (int)(0.114 * (*ptr++)) + (int)(0.587 * (*ptr++)) + (int)(0.299 * (*ptr++));
    					//skip the blank or unused space bits 
    					ptr++;
    					Data[i, j] = (byte)temp;
    				}
    				
    				//skip the blank space bit
    				//if (format24bppRgbFlag)     ptr += bmpData.Stride - Width * 3;
    				//if (format32bppArgbFlag)    ptr += 0;     // += bmpData.Stride - Width * 4; // https://www.cnblogs.com/dearzhoubi/p/8553763.html
    			}
    		}
    		bmp.UnlockBits(bmpData);
    	}
    	public byte [,] GetData()
    	{
    		return Data;
    	}
    }

其他可能有用函数：（Bitmap <= 相互转换=> BitmapSource）

public static System.Drawing.Bitmap ToBitmap(BitmapSource source)
    {
    	using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
    	{
    		BitmapEncoder encoder = new BmpBitmapEncoder();
    		encoder.Frames.Add(BitmapFrame.Create(source));
    		encoder.Save(ms);
    		return new System.Drawing.Bitmap(ms);
    	}
    }
    
    public static BitmapSource ToBitmapSource(System.Drawing.Bitmap bmp)
    {
    	System.IntPtr hBitmap = bmp.GetHbitmap();
    	try
    	{
    		return System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, System.IntPtr.Zero, System.Windows.Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
    	}
    	finally
    	{
    		DeleteObject(hBitmap);
    	}
    }
    
    [System.Runtime.InteropServices.DllImport("Gdi32.dll")]
    private static extern bool DeleteObject(System.IntPtr hObject);