技术老小子
Xabe.FFmpeg 热成像视觉特效完全指南
编辑
2025-11-22
C#
00

目录

概述
环境准备
NuGet 包安装
引用命名空间
热成像效果核心实现
热成像风格枚举
热成像特效处理类
使用示例
结论

概述

热成像（Thermal Imaging）效果可以模拟红外线或热感应视觉，为视频添加独特的科技感和视觉冲击力。本文将深入探讨如何使用 Xabe.FFmpeg 实现多种热成像特效。

环境准备

NuGet 包安装

Bash
Install-Package Xabe.FFmpeg

引用命名空间

C#
using System;
using System.Threading.Tasks;
using Xabe.FFmpeg;

热成像效果核心实现

热成像风格枚举

C#
public enum ThermalStyle
{
    Classic,        // 经典红外线
    ColdSpectrum,   // 冷色谱
    HotSpectrum,    // 热色谱
    NightVision,    // 夜视仪
    CyberPunk      // 赛博朋克风格
}

热成像特效处理类

C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xabe.FFmpeg;

namespace App20
{
    public class ThermalVideoProcessor
    {
        /// <summary>
        /// 热成像视频处理
        /// </summary>
        /// <param name="inputPath">输入视频路径</param>
        /// <param name="outputPath">输出视频路径</param>
        /// <param name="style">热成像风格</param>
        /// <returns></returns>
        public async Task ApplyThermalEffect(
              string inputPath,
              string outputPath,
              ThermalStyle style = ThermalStyle.Classic)
        {
            try
            {
                // 修正后的热成像滤镜  
                string videoFilter = style switch
                {
                    ThermalStyle.Classic =>
                        "format=yuv420p," +                  // 确保颜色空间兼容  
                        "lutyuv=" +                          // 颜色查表  
                        "y='val*1.2':" +                     // 注意添加引号  
                        "u='128+val/2':" +                   // 正确的色度调整  
                        "v='128+val/2'," +
                        "colorchannelmixer=" +               // 色彩混合  
                        "rr=0:rg=0:rb=1:" +
                        "gr=0:gg=0:gb=0:" +
                        "br=0:bg=0:bb=0," +
                        "eq=contrast=1.2:brightness=0.1",

                    ThermalStyle.ColdSpectrum =>
                        "format=yuv420p," +
                        "lutyuv=" +
                        "y='val*1.1':" +
                        "u='val*1.3':" +
                        "v='val*0.7'," +
                        "colorchannelmixer=" +
                        "rr=0:rg=0:rb=1:" +
                        "gr=0:gg=1:gb=0:" +
                        "br=1:bg=0:bb=0," +
                        "eq=contrast=1.3:brightness=-0.1:saturation=1.5",

                    ThermalStyle.HotSpectrum =>
                        "format=yuv420p," +
                        "lutyuv=" +
                        "y='val*1.3':" +
                        "u='val*0.7':" +
                        "v='val*1.2'," +
                        "colorchannelmixer=" +
                        "rr=1:rg=0:rb=0:" +
                        "gr=0:gg=0:gb=1:" +
                        "br=0:bg=1:bb=0," +
                        "eq=contrast=1.4:brightness=0.2:saturation=1.8",

                    ThermalStyle.NightVision =>
                        "format=yuv420p," +
                        "lutyuv=" +
                        "y='val*1.5':" +
                        "u='128+val/2':" +
                        "v='128-val/2'," +
                        "colorchannelmixer=" +
                        "rr=0:rg=1:rb=0:" +
                        "gr=0:gg=0:gb=1:" +
                        "br=1:bg=0:bb=0," +
                        "eq=contrast=1.5:brightness=0:gamma=0.8:saturation=1.2," +
                        "noise=alls=20:allf=t+u",

                    ThermalStyle.CyberPunk =>
                        "format=yuv420p," +
                        "lutyuv=" +
                        "y='val*1.4':" +
                        "u='val*1.2':" +
                        "v='val*0.8'," +
                        "colorchannelmixer=" +
                        "rr=1:rg=0:rb=1:" +
                        "gr=0:gg=1:gb=1:" +
                        "br=1:bg=1:bb=0," +
                        "eq=contrast=1.6:brightness=0.1:saturation=2.0," +
                        "gblur=sigma=0.5",

                    _ => throw new ArgumentException("无效的热成像风格")
                };

                // 转换方法保持不变  
                var conversion = FFmpeg.Conversions.New()
                    .AddParameter($"-i \"{inputPath}\"")
                    .AddParameter("-vf")
                    .AddParameter($"\"{videoFilter}\"")
                    .AddParameter("-c:v")
                    .AddParameter("libx264")
                    .AddParameter("-preset")
                    .AddParameter("medium")
                    .AddParameter("-crf")
                    .AddParameter("23")
                    .AddParameter("-c:a")
                    .AddParameter("copy")
                    .SetOutput(outputPath);

                // 执行转换  
                IConversionResult result = await conversion.Start();

                Console.WriteLine($"热成像特效处理完成：{style} 风格");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"热成像处理错误: {ex.Message}");
                Console.WriteLine($"详细异常: {ex.StackTrace}");
            }
        }

        /// <summary>
        /// 动态热成像效果
        /// </summary>
        public async Task DynamicThermalEffect(
            string inputPath,
            string outputPath)
        {
            string complexFilter =
                // 分割输入流
                "split[original][thermal];" +

                // 热成像处理
                "[thermal]lutyuv=y=val*1.3:" +
                "u=val*1.2:v=val*0.8," +
                "colorchannelmixer=rr=1:rg=0:rb=1:" +
                "gr=0:gg=1:gb=1:" +
                "br=1:bg=1:bb=0," +
                "eq=contrast=1.6:brightness=0.1:" +
                "saturation=2.0," +
                "gblur=sigma=0.5," +
                "colorwave=0.5[thermalEffect];" +

                // 混合原始视频和热成像效果
                "[original][thermalEffect]blend=all_mode=overlay:all_opacity=0.6";

            var conversion = FFmpeg.Conversions.New()
                .AddParameter($"-i \"{inputPath}\"")
                .AddParameter("-filter_complex")
                .AddParameter($"\"{complexFilter}\"")
                .AddParameter("-c:v")
                .AddParameter("libx264")
                .AddParameter("-preset")
                .AddParameter("slow")
                .AddParameter("-crf")
                .AddParameter("20")
                .AddParameter("-c:a")
                .AddParameter("copy")
                .SetOutput(outputPath);

            await conversion.Start();
        }

        /// <summary>
        /// 热点追踪效果
        /// </summary>
        public async Task HotspotTrackingEffect(
            string inputPath,
            string outputPath)
        {
            string complexFilter =
                // 分割输入流
                "split[original][hotspot];" +

                // 热点处理
                "[hotspot]scale=iw/2:ih/2," +  // 缩小处理
                "gblur=sigma=5," +              // 高斯模糊
                "colorchannelmixer=rr=1:rg=0:rb=0:" + // 红色通道增强
                "gr=0:gg=0:gb=0:" +
                "br=0:bg=0:bb=0," +
                "eq=contrast=1.5:brightness=0.2," +
                "threshold=0.1[hotspotMask];" + // 阈值处理

                // 混合原始视频和热点遮罩
                "[original][hotspotMask]blend=all_mode=screen:all_opacity=0.7";

            var conversion = FFmpeg.Conversions.New()
                .AddParameter($"-i \"{inputPath}\"")
                .AddParameter("-filter_complex")
                .AddParameter($"\"{complexFilter}\"")
                .AddParameter("-c:v")
                .AddParameter("libx264")
                .AddParameter("-preset")
                .AddParameter("slow")
                .AddParameter("-crf")
                .AddParameter("20")
                .AddParameter("-c:a")
                .AddParameter("copy")
                .SetOutput(outputPath);

            await conversion.Start();
        }
    }
}

使用示例

C#
using Xabe.FFmpeg;

namespace App20
{
    public enum ThermalStyle
    {
        Classic,        // 经典红外线
        ColdSpectrum,   // 冷色谱
        HotSpectrum,    // 热色谱
        NightVision,    // 夜视仪
        CyberPunk      // 赛博朋克风格
    }
    internal class Program
    {
        static async Task Main(string[] args)
        {
            // 设置FFmpeg路径（如果非标准安装）
            FFmpeg.SetExecutablesPath("D:\\Software\\ffmpeg-master-latest-win64-gpl-shared\\bin");

            var thermalProcessor = new ThermalVideoProcessor();

            try
            {
                // 经典热成像
                await thermalProcessor.ApplyThermalEffect(
                    @"D:\video\1.mp4",
                    @"D:\classic_thermal.mp4",
                    ThermalStyle.Classic
                );

                //// 赛博朋克风格
                //await thermalProcessor.ApplyThermalEffect(
                //    @"D:\input_video.mp4",
                //    @"D:\cyberpunk_thermal.mp4",
                //    ThermalStyle.CyberPunk
                //);

                //// 动态热成像
                //await thermalProcessor.DynamicThermalEffect(
                //    @"D:\input_video.mp4",
                //    @"D:\dynamic_thermal.mp4"
                //);

                //// 热点追踪
                //await thermalProcessor.HotspotTrackingEffect(
                //    @"D:\input_video.mp4",
                //    @"D:\hotspot_thermal.mp4"
                //);
            }
            catch (Exception ex)
            {
                Console.WriteLine($"处理失败: {ex.Message}");
            }
        }
    }
}

image.png

image.png

结论

  • 不同的热成像风格通过调整 lutyuv、colorchannelmixer 和 eq 等滤镜实现
  • 复杂的热成像效果可以通过组合多个滤镜实现
  • 建议在实际应用中根据具体需求微调参数

本文作者:技术老小子

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