访问16位TIFF中的像素 [英] Access pixels in a 16-bit TIFF

问题描述

我导入了一个灰度16位图像。我把它作为BitmapSource和一个Image（控件命名空间）。我如何访问各个像素？ CopyPixels我读过唯一或最好的方法吗？如果是这样，我不知道如何设置步幅，以及哪个像素包含像素强度值。

I have imported a greyscale 16-bit image. I have it bot as a BitmapSource and an Image (of Controls namespace). How can i access the individual pixels? Is the CopyPixels i have read about the only or best way? If so, i don't get how to set the stride, and which pixel contains the pixel intensity value.

方法1：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
using Nikon;
using WindowsFormsApplication1;
using System.Windows.Media.Imaging;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Controls;

namespace Map
{
    class OpenTIFF
    {
        static void OpenOne()
        {
        // Open a Stream and decode a TIFF image
        Stream imageStreamSource = new FileStream("C:\\Users\\Me\\Desktop\\"MyTif.tif", FileMode.Open, FileAccess.Read, FileShare.Read);
        TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
        BitmapSource bitmapSource = decoder.Frames[0];
        System.Windows.Controls.Image image = new System.Windows.Controls.Image();
        image.Source = bitmapSource;
        }
    }
}

我认为这可能更简单（找到这里），但后来我不清楚如何访问1D中的单个像素字节数组。

I think this might be simpler (found here), but then i am unclear how to access individual pixels in a 1D byte array.

方法2：

static void OpenTwo()
       {
           System.Drawing.Image imageToConvert = System.Drawing.Image.FromFile("aa.tif", true);
           byte[] Ret = new byte[0];
           using (MemoryStream ms = new MemoryStream())
           {
               imageToConvert.Save(ms, ImageFormat.Tiff);
               Ret = ms.ToArray();
           }
       }

谢谢，
Dan

Thanks, Dan

推荐答案

您可能想要查看免费图片库。
它有一个C＃包装器。
http://freeimage.sourceforge.net/index.html

You might want to check out the free image library. It has a C# wrapper. http://freeimage.sourceforge.net/index.html

为了帮助您入门并提供一个简单示例：

To get you started and give a quick example:

1. 下载二进制分发


2. 在visual studio中打开FreeImage.NET.sln（我使用2010）


3. 构建库项目


4. 如果你接收XML注释中的错误执行以下操作：进入项目属性，在构建下，将将警告视为错误从全部更改为无


5. 创建新的控制台项目。


6. 添加对在步骤3中构建的程序集的引用。
   
   FreeImage3154Win32\FreeImage \Wrapper\FreeImage.NET\cs\Library\bin \Debug \FreeImageNET.dll



7. 将以下代码添加到Program.cs

1. download the binary distribution
2. open FreeImage.NET.sln in visual studio (I used 2010)
3. build the Library project
4. if you receive errors in the XML comments do the following: go in the project properties, under build, change "treat warnings as errors" from "all" to "none"
5. Create new console project.
6. Add reference to the assembly you built in step 3.
   FreeImage3154Win32\FreeImage\Wrapper\FreeImage.NET\cs\Library\bin\Debug\FreeImageNET.dll

7. Add the following code to Program.cs

using FreeImageAPI;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            // load image, this can by your 16-bit tif
            FIBITMAP dib = FreeImage.LoadEx("myfile.tif");
            // convert to 8-bits
            dib = FreeImage.ConvertToGreyscale(dib);
            // rotate image by 90 degrees
            dib = FreeImage.Rotate(dib, 90);
            // save image
            FreeImage.SaveEx(dib, "newfile.png");
            // unload bitmap
            FreeImage.UnloadEx(ref dib);
       }
    }

}

解决方案中有很多包含库项目的示例。

There is a good selection of examples in the solution that contained the Library project.

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