/usr/include/vxl/contrib/tbl/vepl1/ is in libvxl1-dev 1.17.0.dfsg2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vxl/contrib/tbl/vepl1/vepl1_add_random_noise.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_convert.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_convert.txx
/usr/include/vxl/contrib/tbl/vepl1/vepl1_dilate_disk.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_dyadic.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_erode_disk.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_gaussian_convolution.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_gradient_dir.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_gradient_mag.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_histogram.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_median.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_moment.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_monadic.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_sobel.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_threshold.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_x_gradient.h
/usr/include/vxl/contrib/tbl/vepl1/vepl1_y_gradient.h