【摘要】：人臉表情是人們日常溝通中最重要的一種表現特征,對于情感計算的研究發展具有重要意義。針對靜態表情圖像,單一的整體模版匹配方法特征維數較高,含有較多無關區域特征,因此很難獲得較好的識別效果。本文從幾何置信區域角度出發,采用本文給出的基于幾何先驗的加權策略進行特征融合,結合線性判別分析算法進行研究,獲得了較好的效果。本論文的主要工作如下:(1)給出一種基于子區域(置信區域)和多特征的加權融合特征提取算法。針對檢測區域存在較多與人臉部分不相關的區域,通過給出基于幾何先驗的裁剪策略作用于檢測區域,得到更加精確的人臉及其子區域。針對人臉圖像存在表情無關區域并且單一特征描繪不準確的特點,采用Gabor小波對人臉區域進行特征提取,HOG對置信區域進行特征提取,通過研究置信區域在人臉表情中的先驗信息(敏感度)并且實驗加以論證,最終給不同的置信區域設置相應權值,得到加權融合特征。在多個數據集上進行實驗,驗證了本文算法的有效性。(2)給出一種基于類內散度矩陣修正的改進LDA算法。針對初步降維特征缺少判別特性的缺點,通過在類內散度矩陣中引入余弦相似度信息,將每類樣本向量與其均值向量之間的夾角余弦值通過線性變換加權乘到對應協方差矩陣中,獲得更好的類內聚合度和類間離散度。在多個數據集上進行實驗,驗證了本文改進算法的有效性。(3)構造一種GRNN神經網絡分類器首次應用于人臉表情識別領域。針對傳統分類器對小樣本非線性數據擬合的局限性,通過對人臉表情數據特點的分析,構造一種GRNN分類器嵌入表情識別算法中,將融合特征作為網絡的輸入,經過模式層和求和層之后完成訓練。在多個數據集上進行實驗,驗證了本文算法的有效性。
[Abstract]:Facial expression is one of the most important expression features in people's daily communication, which is of great significance to the research and development of emotional computing. For the static facial expression image, the single integral template matching method has higher feature dimension and more independent region features, so it is difficult to obtain a better recognition effect. In this paper, from the point of view of geometric confidence region, the feature fusion based on geometric priori weighting strategy is adopted, and the linear discriminant analysis (LDA) algorithm is used to study the feature fusion, and good results are obtained. The main work of this paper is as follows: (1) A weighted fusion feature extraction algorithm based on sub-region (confidence region) and multi-feature is proposed. Because there are many regions which are not related to the face part in the detection region, a geometric priori based clipping strategy is given to the detection region to obtain more accurate face and its sub-regions. In view of the feature of facial expression independent region and inaccurate description of single feature in face image, Gabor wavelet is used to extract the feature of face region, and HOG is used to extract the feature of confidence region. By studying the priori information (sensitivity) of the confidence region in the facial expression and proving it experimentally, the weighted fusion feature is obtained by setting the corresponding weights for the different confidence regions. Experiments on multiple datasets show the effectiveness of the proposed algorithm. (2) an improved LDA algorithm based on the correction of the intra-class divergence matrix is proposed. In view of the lack of discriminant characteristics in the preliminary dimensionality reduction feature, the cosine similarity information is introduced into the intra-class divergence matrix. The angle cosine value between each class of sample vector and its mean vector is weighted by linear transformation to the corresponding covariance matrix to obtain a better degree of intra-class aggregation and inter-class dispersion. Experiments on multiple datasets show the effectiveness of the improved algorithm. (3) A GRNN neural network classifier is first applied to facial expression recognition. Aiming at the limitation of the traditional classifier to fit the small sample nonlinear data, a GRNN classifier embedded in the facial expression recognition algorithm is constructed by analyzing the features of the facial expression data, and the fusion feature is taken as the input of the network. After the mode layer and summation layer completed the training. Experiments on multiple datasets show the effectiveness of the proposed algorithm.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP391.41

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本文編號：2367089