Object Reidentification via Joint Quadruple Decorrelation Directional Deep Networks in Smart Transportation

Object reidentification with the goal of matching pedestrian or vehicle images captured from different camera viewpoints is of considerable significance to public security. Quadruple directional deep learning features (QD-DLFs) can comprehensively describe object images. However, the correlation among QD-DLFs is an unavoidable problem, since QD-DLFs are learned with quadruple independent directional deep networks (QIDDNs) driven with the same training data, and each network holds the same basic deep feature learning architecture (BDFLA). The correlation among QD-DLFs is harmful to the complementarity of QD-DLFs, restricting the object reidentification performance. For that, we propose joint quadruple decorrelation directional deep networks (JQD(3)Ns) to reduce the correlation among the learned QD-DLFs. In order to jointly train JQD(3)Ns, besides the softmax loss functions, a parameter correlation cost function is proposed to indirectly reduce the correlation among QD-DLFs by enlarging the dissimilarity among the parameters of JQD(3)Ns. Extensive experiments on three publicly available large-scale data sets demonstrate that the proposed JQD(3)Ns approach is superior to multiple state-of-the-art object reidentification methods.