Abstract：Extracting the image features with strong representation is critical to complete different vision tasks. The traditional features only describe one aspect of the image information, and therefore their representation capability is limited. In this paper, deep hierarchical feature(DHF) extraction algorithm based on the convolutional neural networks(CNN) is proposed. The essential information hidden inside the image is effectively mined by abstractly expressing the image in different layers. Firstly, the feature maps of the image are created based on CNN, and those in the convolutional layers are selected to construct the hierarchical structure of the image. Then, the best layer combination is determined according to the matching experiment. The feature maps in the low layers are described by the information entropy, and the ones in high layers are described by averaging the pixels in specified region. the DHF with strong representative capability is ultimately constructed. The experiment demonstrates that the proposed DHF has evident advantages compared with the existing features, and it can complete the matching task with high efficiency.
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