/// <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>
/// 抽取人脸特征
/// </summary>
/// <param name="image">要抽取的人脸特征图像数据</param>
/// <param name="faceLocation">人脸位置</param>
/// <param name="orient">人脸朝向</param>
/// <exception cref="Exception">如果执行失败，则抛出异常，并给出失败结果</exception>
/// <returns>如果执行成功，返回特征数据，如果为null，则表示faceLocation的位置不存在人脸</returns>
public Feature ExtractFeature(ImageData image, FaceRect faceLocation, OrientCode orient)
{
var faceRes = new AFR_FSDK_FACEINPUT
{
rcFace = faceLocation,
lOrient = (int)orient
};
var result =
(ErrorCode)RecognizeWrapper.AFR_FSDK_ExtractFRFeature(Engine, ref image, ref faceRes,
out var faceModel);
if (result == ErrorCode.Ok)
{
var data = new byte[faceModel.lFeatureSize];
Marshal.Copy(faceModel.pbFeature, data, 0, faceModel.lFeatureSize);
var feature = new Feature
{
FeatureData = data,
Rect = faceLocation
};
return(feature);
}
//采用Tracking定位时，可能出现识别错误的位置，此时返回的错误为Unsupported，遇到这样的情况直接返回null
if (result == ErrorCode.Unsupported)
{
return(null);
}
throw new FaceException(result);
}
public static AFR_FSDK_FACEMODEL extractFRFeature(IntPtr hFREngine, ASVLOFFSCREEN inputImg, FaceInfo faceInfo)
{
AFR_FSDK_FACEINPUT faceinput = new AFR_FSDK_FACEINPUT();
faceinput.lOrient = faceInfo.orient;
faceinput.rcFace.left = faceInfo.left;
faceinput.rcFace.top = faceInfo.top;
faceinput.rcFace.right = faceInfo.right;
faceinput.rcFace.bottom = faceInfo.bottom;
AFR_FSDK_FACEMODEL faceFeature = new AFR_FSDK_FACEMODEL(IntPtr.Zero, 0);
IntPtr ret = AFR_FSDKLibrary.AFR_FSDK_ExtractFRFeature(hFREngine, ref (inputImg), ref (faceinput), ref (faceFeature));
if (ret.ToInt64() != 0)
{
Console.WriteLine(String.Format("AFR_FSDK_ExtractFRFeature ret 0x{0:x}", ret));
return(new AFR_FSDK_FACEMODEL(IntPtr.Zero, 0));
}
try
{
return(faceFeature.deepCopy());
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
return(new AFR_FSDK_FACEMODEL(IntPtr.Zero, 0));
}
}
