/usr/share/doc/cimg-dev/ is in cimg-examples 1.6.5+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/cimg-dev/examples/
/usr/share/doc/cimg-dev/examples/CImg_demo.cpp
/usr/share/doc/cimg-dev/examples/CMakeLists.txt.gz
/usr/share/doc/cimg-dev/examples/Makefile
/usr/share/doc/cimg-dev/examples/captcha.cpp
/usr/share/doc/cimg-dev/examples/curve_editor2d.cpp
/usr/share/doc/cimg-dev/examples/dtmri_view3d.cpp
/usr/share/doc/cimg-dev/examples/edge_explorer2d.cpp
/usr/share/doc/cimg-dev/examples/fade_images.cpp
/usr/share/doc/cimg-dev/examples/gaussian_fit1d.cpp
/usr/share/doc/cimg-dev/examples/generate_loop_macros.cpp
/usr/share/doc/cimg-dev/examples/hough_transform2d.cpp
/usr/share/doc/cimg-dev/examples/image2ascii.cpp
/usr/share/doc/cimg-dev/examples/image_registration2d.cpp
/usr/share/doc/cimg-dev/examples/image_surface3d.cpp
/usr/share/doc/cimg-dev/examples/img/
/usr/share/doc/cimg-dev/examples/img/CImg_demo.h
/usr/share/doc/cimg-dev/examples/img/logo.bmp
/usr/share/doc/cimg-dev/examples/img/milla.bmp
/usr/share/doc/cimg-dev/examples/img/odykill.h
/usr/share/doc/cimg-dev/examples/img/parrot.ppm
/usr/share/doc/cimg-dev/examples/img/parrot_mask.pgm
/usr/share/doc/cimg-dev/examples/img/sh0r.pgm
/usr/share/doc/cimg-dev/examples/img/sh1r.pgm
/usr/share/doc/cimg-dev/examples/img/tetris.h
/usr/share/doc/cimg-dev/examples/jawbreaker.cpp
/usr/share/doc/cimg-dev/examples/mcf_levelsets2d.cpp
/usr/share/doc/cimg-dev/examples/mcf_levelsets3d.cpp
/usr/share/doc/cimg-dev/examples/odykill.cpp
/usr/share/doc/cimg-dev/examples/pde_TschumperleDeriche2d.cpp
/usr/share/doc/cimg-dev/examples/pde_heatflow2d.cpp
/usr/share/doc/cimg-dev/examples/plotter1d.cpp
/usr/share/doc/cimg-dev/examples/radon_transform2d.cpp
/usr/share/doc/cimg-dev/examples/scene3d.cpp
/usr/share/doc/cimg-dev/examples/spherical_function3d.cpp
/usr/share/doc/cimg-dev/examples/tetris.cpp
/usr/share/doc/cimg-dev/examples/tron.cpp
/usr/share/doc/cimg-dev/examples/tutorial.cpp
/usr/share/doc/cimg-dev/examples/use_RGBclass.cpp
/usr/share/doc/cimg-dev/examples/use_chlpca.cpp
/usr/share/doc/cimg-dev/examples/use_cimgIPL.cpp
/usr/share/doc/cimg-dev/examples/use_cimgmatlab.cpp
/usr/share/doc/cimg-dev/examples/use_cimgmatlab.m
/usr/share/doc/cimg-dev/examples/use_draw_gradient.cpp
/usr/share/doc/cimg-dev/examples/use_jpeg_buffer.cpp
/usr/share/doc/cimg-dev/examples/use_nlmeans.cpp
/usr/share/doc/cimg-dev/examples/use_patchmatch.cpp
/usr/share/doc/cimg-dev/examples/use_skeleton.cpp
/usr/share/doc/cimg-dev/examples/use_tiff_stream.cpp
/usr/share/doc/cimg-dev/examples/use_tinymatwriter.cpp
/usr/share/doc/cimg-dev/examples/wavelet_atrous.cpp