Geometric Constraints Histogram Descriptor Based on Curvature Mesh Graph for Image Retrieval

A new geometric constraints histogram descriptor (GCHD) based on curvature mesh graph for image retrieval is presented in this paper. Through this method, the edge and angle geometric constraints based on the curvature mesh graph are extracted firstly. Then the histogram algorithm is applied on the geometric constraints to obtain the histogram matrix for each curvature point. Finally, the histograms are statistically normalized to form a histogram descriptor with fixed dimension. Experimental results validate the robustness and invariance of the proposed descriptor.