Figure. 4 Important components of cumulative foot pressure 

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![0_image_7.png](0_image_7.png) in discriminative hierarchical linear-constrained sparse coding are more discriminative. Because these components of a given cumulative foot pressure image are corresponding to one gait sequence [18]. 

However, our work is only an initial work on cumulative foot pressure images. Future works are needed in at least four directions. One is that the shoes-invariant pedestrian recognition using cumulative foot pressure images. The performance of our proposed method does not meet the practical needs. Besides, the relations between cumulative foot pressure images and footprint are needed to be mentioned. Once the relations are found, some forensic applications such as suspect identification would be more reliable and more efficient. Thirdly, the relations between cumulative foot pressure images and gait are needed to be studied. Based on the studies, we can develop a more practical fusion-based pedestrian identification system. Finally but not least, a large and standard open dataset with specific evaluation criteria are needed. In this paper, we have contributed to the first one and fourth one. 

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