MS Faces API를 이용하여 사진에서 얼굴 추출 후 Blur 처리 하기

cs-detect-faces.cs

using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using ImageProcessorCore;
using Microsoft.ProjectOxford.Face;
using Microsoft.ProjectOxford.Face.Contract;

/*
 	http://www.sysnet.pe.kr/2/0/11095

	PM> Install-Package Microsoft.ProjectOxford.Face
	PM> Install-Package ChyImageProcessorCore -Pre
	PM> Install-Package System.Numerics.Vectors -Pre 
	PM> Install-Package System.Runtime.CompilerServices.Unsafe 

	API 키 발급
	https://www.microsoft.com/cognitive-services/en-us/sign-up
*/

public class Program
{
    public static void Main(string[] args)
    {
		const string sourceImage = @"...원본 이미지 파일 경로...";
		const string destinationImage = @"...대상 이미지 파일 경로...";

		var detects = DetectFaces(sourceImage, "...API키...");
		var faceRects = detects.Result;

        Console.WriteLine($"Detected {faceRects.Length} faces");

        BlurFaces(faceRects, sourceImage, destinationImage);

        Console.WriteLine($"Done!!!");

		Console.ReadKey();
    }

    private static void BlurFaces(FaceRectangle[] faceRects, string sourceImage, string destinationImage)
    {
        if (File.Exists(destinationImage))
        {
            File.Delete(destinationImage);
        }

        if (faceRects.Length > 0)
        {
            using (FileStream stream = File.OpenRead(sourceImage))
            using (FileStream output = File.OpenWrite(destinationImage))
            {
                var image = new Image<Color, uint>(stream);

                foreach (var faceRect in faceRects)
                {
                    var rectangle = new Rectangle(
                        faceRect.Left,
                        faceRect.Top,
                        faceRect.Width,
                        faceRect.Height);

                    image = image.BoxBlur(20, rectangle);
                }

                image.SaveAsJpeg(output);
            }
        }
    }

    private static async Task<FaceRectangle[]> DetectFaces(string imageFilePath, string apiKey)
    {
        var faceServiceClient = new FaceServiceClient(apiKey);

        try
        {
            using (Stream imageFileStream = File.OpenRead(imageFilePath))
            {
                var faces = await faceServiceClient.DetectAsync(imageFileStream);
                var faceRects = faces.Select(face => face.FaceRectangle);
                return faceRects.ToArray();
            }
        }
        catch (Exception)
        {
            return new FaceRectangle[0];
        }
    }
}