Illustration of image features. For a sample image patch of a dendritic tree structure (left), we show the corresponding response images of the 8 filters in the MR8 filter bank. The first three columns depict the response of the two anisotropic filters at three scales. The last column reflects the response of the two isotropic filters. At each pixel, the associated feature vector computed consists of the scalar value at the corresponding location in each of the 8 feature maps.