基于信息增量特征选择的微表情识别方法

Micro-Expression Recognition Method Based on Information Gain Feature Selection

基于LBP-TOP、HOG-TOP、HIGO-TOP特征描述子的微表情识别方法通常提取到的特征向量维度较高,计算复杂度较大,运行时间较长,识别准确率较低。为此,提出一种基于信息增量(IG)特征选择的识别方法。运用IG特征选择方法对高维度特征向量进行降维,提高识别效率。运用支持向量机分类器的线性核、卡方核、直方图交叉核进行留一交叉验证,以完成分类任务。在SMIC和CASME2数据集上进行实验,结果表明,经IG选择后,特征向量在2个数据集上的识别准确率分别达到76.22%和73.68%,分类所需时间分别缩短为原方法的3.67%和3.64%,验证了该方法的有效性。

Micro-expression recognition method based on feature descriptor of LBP-TOP,HOG-TOP and HIGO-TOP usually extract feature vectors with high dimensions,and have high computation complexity,long running time and low recognition accuracy.Therefore,a recognition method based on Information Gain(IG) feature selection is proposed.The IG feature selection method is applied to reduce the dimensions of feature vectors and improve the recognition efficiency.The Leave-One-Subject-Out Cross Validation is performed for the micro-expression classification with linear kernel,chi-square kernel and histogram intersection kernel of Support Vector Machine(SVM) classifier.On the SMIC and CASME2 datasets,the recognition accuracy of feature vectors selected by IG achicves 76.22 % and 73.68 % respectively.And the time required for classification is only 3.67 % and 3.64 % of the original method.These results prove the effectiveness of the proposed method.