基于距离限定优化的人脸识别

Face recognition based on limit distance optimization

针对现有人脸识别方法对人脸角度、表情、姿态等因素较为敏感且准确率低的问题,提出了一种基于距离限定优化算法的人脸识别模型。该模型对人脸识别方法的改进有两点:a)利用LBP算子提取人脸图像纹理谱特征图,然后与原始人脸图像的R、G、B通道进行融合,将融合后的图像矩阵作为神经网络的输入,丰富了人脸的纹理特征; b)对误差函数进行改进,使用阈值和边界值约束特征向量的距离,对模型构建新的优化目标,使得相同对象的人脸图像在特征空间中具有较小的欧氏距离,不同对象的人脸图像在特征空间中具有较大的欧氏距离。通过在非限制场景下的LFW人脸库上进行实验,表明该模型准确率分别达到99. 15%,能有效地提高人脸识别准确率,具有很好的鲁棒性。

Given the sensitivity of human face angle,expression and attitude as well as the low recognition precision,this paper presented a new face recognition algorithm based on distance optimization method.There were two revised points in the proposed method:a)The algorithm used the LBP operator to extract the texture map of the face image and then converged it with the R,G and B channels of the original image,then the neural network could take the fused image matrix as input,which enriched the human face texture features;b)In the processing of training,it reconstructed the loss function to improve the performance,made use of the thresold and margin to constrain the distance of the feature vector,and built a new optimization target for the model,which could limit the faces of the same person have small euclidean distances and faces of distinct people have large distances.Experiments on the unconstrained scenes of the LFW face database show that the accuracy of the model is 99.15%respectively,indict the model can improve the accuracy of face recognition with strong robustness.