如何在C#中从JPEG提取量化矩阵 [英] How to extract quantization matrices from a JPEG in C#

问题描述

是否可以在C#中提取JPG文件的量化矩阵?我已经找到了libjpeg.NET，但是我不知道如何检索QT矩阵.请在下面找到我的代码.

Is it possible to extract the quantization matrices of a JPG file in C#? I have found the libjpeg.NET but I cannot figure out how to retrieve the QTs matrices. Please find below my code.

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using BitMiracle.LibJpeg;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {

            string file = @"PATH_TO_FILE";
            JpegImage img = new JpegImage(file);    
            Console.Read();            
            // Ideally, there should be some img.GetQuantizationMatrix() method    
        }
    }
}

推荐答案

如果您只想使用量化表(别无其他)，只需扫描JPEG流中的DQT标记即可(FFDB后面跟着一个2字节长)并提取值.

If you just want the quantization tables (and nothing else), it is a simple matter to scan the JPEG stream for the DQT marker (FFDB-followed by a 2-byte length) and extract the values.

您无需解码图像即可获取此信息.

You do not need to decode the image to get this information.

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