EL: Local Image Descriptor Based on Extreme Responses to Partial Derivatives of 2D Gaussian Function

Figure 4

The final values of the truncated descriptor components (after step 5) for different numbers of adaptive thresholding iterations (steps 1 to 3) computed for six corresponding patches. The color circles on the ordinate represent the final values of the truncated descriptor components obtained when using RootSIFT normalization.