问题的出现原因是需要比较Microsoft Word文档中的图片和文件夹中的图片是否相同。解决方法是将文档中的图片表示为位图实例，然后逐像素地与文件夹中的位图实例进行比较。比较的过程包括将内联形状复制到剪贴板中，并将其转换为位图，然后按大小和像素逐个比较。

以下是一个示例的C#控制台应用程序，使用.NET 4.5，Microsoft Office对象库版本15.0和Microsoft Word对象库版本15.0实现：

using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
using Application = Microsoft.Office.Interop.Word.Application;
namespace WordDocStats
{
    class Program
    {
        static void Main()
        {
            var wordApplication = new Application();
            var document = wordApplication.Documents.Open(@"C:\Users\Username\Documents\document.docx");
            
            var bitmapToCompareAgainst = new Bitmap(@"C:\Users\Username\Documents\image.png");
            
            for (var i = 1; i <= wordApplication.ActiveDocument.InlineShapes.Count; i++)
            {
                var inlineShapeId = i; 
                var thread = new Thread(() => CompareInlineShapeAndBitmap(inlineShapeId, bitmapToCompareAgainst, wordApplication));
                thread.SetApartmentState(ApartmentState.STA);
                thread.Start();
                thread.Join();
            }
            
            wordApplication.Quit();
            Console.ReadLine();
        }
        
        protected static void CompareInlineShapeAndBitmap(int inlineShapeId, Bitmap bitmapToCompareAgainst, Application wordApplication)
        {
            var inlineShape = wordApplication.ActiveDocument.InlineShapes[inlineShapeId];
            inlineShape.Select();
            wordApplication.Selection.Copy();
            
            if (Clipboard.GetDataObject() != null)
            {
                var data = Clipboard.GetDataObject();
                
                if (data != null && data.GetDataPresent(DataFormats.Bitmap))
                {
                    var image = (Image)data.GetData(DataFormats.Bitmap, true);
                    var currentBitmap = new Bitmap(image);
                    var imagesAreEqual = true;
                    
                    if(currentBitmap.Width == bitmapToCompareAgainst.Width && currentBitmap.Height == bitmapToCompareAgainst.Height)
                    {
                        for (var i = 0; i < currentBitmap.Width; i++)
                        {
                            if(!imagesAreEqual)
                                break;
                            for (var j = 0; j < currentBitmap.Height; j++)
                            {
                                if (currentBitmap.GetPixel(i, j).Equals(bitmapToCompareAgainst.GetPixel(i, j)))
                                    continue;
                                imagesAreEqual = false;
                                break;
                            }
                        }
                    }
                    else
                    {
                        imagesAreEqual = false;
                    }
                    Console.WriteLine("Inline shape #{0} is equal to the 'external' bitmap: {1}", inlineShapeId, imagesAreEqual);
                }
                else
                {
                    Console.WriteLine("Clipboard data is not in an image format");
                }
            }
            else
            {
                Console.WriteLine("Clipboard is empty");
            }
        }
    }
}

参考：

- Threadstart with params: https://stackoverflow.com/a/1195915/700926

- Extracting inline shapes as images from word in C#: https://stackoverflow.com/a/7937590/700926

- Comparing images in C#: http://www.c-sharpcorner.com/uploadfile/prathore/image-comparison-using-C-Sharp/

- Details on how to retrieve an image from the clipboard in C#: https://stackoverflow.com/a/998825/700926

- Details on how to access the clipboard from C#: https://stackoverflow.com/a/518724/700926