/// <summary>
/// RGB摄像头Paint事件,同步RGB人脸框，对比人脸框后进行IR活体检测
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void irVideoSource_Paint(object sender, PaintEventArgs e)
{
if (isDoubleShot && irVideoSource.IsRunning)
{
//如果双摄，且IR摄像头工作，获取IR摄像头图片
Bitmap irBitmap = irVideoSource.GetCurrentVideoFrame();
if (irBitmap == null)
{
return;
}
//得到Rect
MRECT rect = new MRECT();
lock (rectLock)
{
rect = allRect;
}
float irOffsetX = irVideoSource.Width * 1f / irBitmap.Width;
float irOffsetY = irVideoSource.Height * 1f / irBitmap.Height;
float offsetX = irVideoSource.Width * 1f / rgbVideoSource.Width;
float offsetY = irVideoSource.Height * 1f / rgbVideoSource.Height;
//检测IR摄像头下最大人脸
Graphics g = e.Graphics;
float x = rect.left * offsetX;
float width = rect.right * offsetX - x;
float y = rect.top * offsetY;
float height = rect.bottom * offsetY - y;
//根据Rect进行画框
g.DrawRectangle(Pens.Red, x, y, width, height);
if (trackIRUnit.message != "" && x > 0 && y > 0)
{
//将上一帧检测结果显示到页面上
g.DrawString(trackIRUnit.message, font, trackIRUnit.message.Contains("活体") ? blueBrush : yellowBrush, x, y - 15);
}
//保证只检测一帧，防止页面卡顿以及出现其他内存被占用情况
if (isIRLock == false)
{
isIRLock = true;
//异步处理提取特征值和比对，不然页面会比较卡
ThreadPool.QueueUserWorkItem(new WaitCallback(delegate
{
if (rect.left != 0 && rect.right != 0 && rect.top != 0 && rect.bottom != 0)
{
bool isLiveness = false;
try
{
//得到当前摄像头下的图片
if (irBitmap != null)
{
//检测人脸，得到Rect框
ASF_MultiFaceInfo irMultiFaceInfo = FaceUtil.DetectFace(pVideoIRImageEngine, irBitmap);
if (irMultiFaceInfo.faceNum <= 0)
{
return;
}
//得到最大人脸
ASF_SingleFaceInfo irMaxFace = FaceUtil.GetMaxFace(irMultiFaceInfo);
//得到Rect
MRECT irRect = irMaxFace.faceRect;
//判断RGB图片检测的人脸框与IR摄像头检测的人脸框偏移量是否在误差允许范围内
if (isInAllowErrorRange(rect.left * offsetX / irOffsetX, irRect.left) && isInAllowErrorRange(rect.right * offsetX / irOffsetX, irRect.right) &&
isInAllowErrorRange(rect.top * offsetY / irOffsetY, irRect.top) && isInAllowErrorRange(rect.bottom * offsetY / irOffsetY, irRect.bottom))
{
int retCode_Liveness = -1;
//将图片进行灰度转换，然后获取图片数据
ImageInfo irImageInfo = ImageUtil.ReadBMP_IR(irBitmap);
if (irImageInfo == null)
{
return;
}
//IR活体检测
ASF_LivenessInfo liveInfo = FaceUtil.LivenessInfo_IR(pVideoIRImageEngine, irImageInfo, irMultiFaceInfo, out retCode_Liveness);
//判断检测结果
if (retCode_Liveness == 0 && liveInfo.num > 0)
{
int isLive = MemoryUtil.PtrToStructure <int>(liveInfo.isLive);
isLiveness = (isLive == 1) ? true : false;
}
if (irImageInfo != null)
{
MemoryUtil.Free(irImageInfo.imgData);
}
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
trackIRUnit.message = string.Format("IR{0}", isLiveness ? "活体" : "假体");
if (irBitmap != null)
{
irBitmap.Dispose();
}
isIRLock = false;
}
}
else
{
trackIRUnit.message = string.Empty;
}
isIRLock = false;
}));
}
}
}