/// <summary>
/// 人脸识别特征码提取
/// </summary>
/// <param name="image"></param>
/// <param name="rect"></param>
/// <param name="orient"></param>
private byte[] RecognizeFace(Bitmap image, MRECT rect, int orient)
{
IntPtr offInputPtr = ArcFaceDetection.MakeImageInput_ASVLOFFSCREEN(image);
AFR_FSDK_FACEINPUT faceInput = new AFR_FSDK_FACEINPUT();
faceInput.lOrient = orient;
faceInput.rcFace = rect;
//入参
IntPtr faceInputPtr = Marshal.AllocHGlobal(Marshal.SizeOf(faceInput));
Marshal.StructureToPtr(faceInput, faceInputPtr, false);
AFR_FSDK_FACEMODEL faceModel = new AFR_FSDK_FACEMODEL();
IntPtr faceModelPtr = Marshal.AllocHGlobal(Marshal.SizeOf(faceModel));
int ret = AFRFunction.AFR_FSDK_ExtractFRFeature(this.faceRecognition.rEngine, offInputPtr, faceInputPtr, faceModelPtr);
if (ret == 0)
{
faceModel = (AFR_FSDK_FACEMODEL)Marshal.PtrToStructure(faceModelPtr, typeof(AFR_FSDK_FACEMODEL));
Marshal.FreeHGlobal(faceModelPtr);
byte[] featureContent = new byte[faceModel.lFeatureSize];
Marshal.Copy(faceModel.pbFeature, featureContent, 0, faceModel.lFeatureSize);
return(featureContent);
}
return(null);
}
/// <summary>
/// 检测特征是否已存在
/// </summary>
/// <param name="featureContent"></param>
/// <returns></returns>
private Tuple <bool, string> IsMatchFeature(byte[] featureContent)
{
if (this.faceFeatures == null)
{
this.LoadFaceFeatures();
}
//待比较的特征数据
IntPtr f2Ptr = Marshal.AllocHGlobal(featureContent.Length);
Marshal.Copy(featureContent, 0, f2Ptr, featureContent.Length);
AFR_FSDK_FACEMODEL model2 = new AFR_FSDK_FACEMODEL();
model2.lFeatureSize = featureContent.Length;
model2.pbFeature = f2Ptr;
IntPtr model2Ptr = Marshal.AllocHGlobal(Marshal.SizeOf(model2));
Marshal.StructureToPtr(model2, model2Ptr, false);
foreach (var feature in this.faceFeatures)
{
//已有的特征数据
IntPtr f1Ptr = Marshal.AllocHGlobal(feature.Feature.Length);
Marshal.Copy(feature.Feature, 0, f1Ptr, feature.Feature.Length);
AFR_FSDK_FACEMODEL model1 = new AFR_FSDK_FACEMODEL();
model1.lFeatureSize = feature.Feature.Length;
model1.pbFeature = f1Ptr;
IntPtr model1Ptr = Marshal.AllocHGlobal(Marshal.SizeOf(model1));
Marshal.StructureToPtr(model1, model1Ptr, false);
float score = 0;
int ret = AFRFunction.AFR_FSDK_FacePairMatching(faceRecognition.rEngine, model1Ptr, model2Ptr, ref score);
Console.WriteLine("score:{0}", score);
//相似度因子：0.75
if (ret == 0 && score >= 0.75f)
{
return(new Tuple <bool, string>(true, feature.FileName));
}
}
return(new Tuple <bool, string>(false, string.Empty));
}
