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Function reference

Image loaders

TestImages.testimage — Function
img = testimage(filename; download_only=false, [ops...])

Load test image that partially matches filename, the first match is used if there're more than one.

If download_only=true, the full filepath is returned. Any other keyword arguments ops will be passed to image IO backend through FileIO.load.

Example

julia> using TestImages
julia> img = testimage("cameraman.tif"); # fullname
julia> img = testimage("cameraman"); # without extension works
julia> img = testimage("c"); # with only partial name also works

Extended help

The following is a complete list of testimages, you can also check them at https://testimages.juliaimages.org/

  • "airplaneF16"
  • "autumn_leaves"
  • "barbara_color"
  • "barbara_gray_512"
  • "bark_512"
  • "bark_he_512"
  • "beach_sand_512"
  • "beach_sand_he_512"
  • "blobs"
  • "brick_wall_512"
  • "brick_wall_he_512"
  • "calf_leather_512"
  • "calf_leather_he_512"
  • "cameraman"
  • "chelsea"
  • "coffee"
  • "earth_apollo17"
  • "fabio_color_256"
  • "fabio_color_512"
  • "fabio_gray_256"
  • "fabio_gray_512"
  • "grass_512"
  • "grass_he_512"
  • "hela-cells"
  • "herringbone_weave_512"
  • "herringbone_weave_he_512"
  • "house"
  • "jetplane"
  • "lake_color"
  • "lake_gray"
  • "lena_color_256"
  • "lena_color_512"
  • "lena_gray_16bit"
  • "lena_gray_256"
  • "lena_gray_512"
  • "lighthouse"
  • "livingroom"
  • "m51"
  • "mandril_color"
  • "mandril_gray"
  • "mandrill"
  • "monarch_color"
  • "monarch_color_256"
  • "moonsurface"
  • "morphology_test_512"
  • "mountainstream"
  • "mri-stack"
  • "multi-channel-time-series.ome"
  • "peppers_color"
  • "peppers_gray"
  • "pigskin_512"
  • "pigskin_he_512"
  • "pirate"
  • "plastic_bubbles_512"
  • "plastic_bubbles_he_512"
  • "raffia_512"
  • "raffia_he_512"
  • "resolution_test_1920"
  • "resolution_test_512"
  • "simple_3d_ball"
  • "simple_3d_psf"
  • "straw_512"
  • "straw_he_512"
  • "sudoku"
  • "toucan"
  • "walkbridge"
  • "water_512"
  • "water_he_512"
  • "woman_blonde"
  • "woman_darkhair"
  • "wood_grain_512"
  • "wood_grain_he_512"
  • "woolen_cloth_512"
  • "woolen_cloth_he_512"
source
TestImages.testimage_dip3e — Function
img = testimage(filename; download_only=false, [ops...]

Load image from the DIP3E textbook that partially matches filename in case-insensitive manner.

If download_only=true, the full filepath is returned. Any other keyword ops will be passed to image IO backend through FileIO.load.

Example

julia> using TestImages
julia> img = testimage_dip3e("cameraman") # matches Fig0222(b)(cameraman).tif
julia> img = testimage_dip3e("fig0222(a)")
License

Permission is required from the owner of a © image if the image is used for other than personal educational or research purposes. See copyright file: https://www.imageprocessingplace.com/DIP-3E/dip3e_copyrights.htm.

DIP3E: "Digital Image Processing, 3rd edition" by Rafael C. Gonzalez and Richard E. Woods

source
TestImages.shepp_logan — Function
phantom = shepp_logan(N, [M=N]; high_contrast=true)

Output the NxM Shepp-Logan phantom, which is a standard test image usually used for comparing image reconstruction algorithms in the field of computed tomography (CT) and magnetic resonance imaging (MRI).

If the argument M is omitted, the phantom is of size NxN. When setting the keyword argument high_constrast to false, the CT version [1] of the phantom is created. Otherwise, the high contrast MRI version [2] is calculated.

References

[1] Shepp, Lawrence A., and Benjamin F. Logan. "The Fourier reconstruction of a head section." IEEE Transactions on nuclear science 21.3 (1974): 21-43.

[2] Toft, Peter Aundal. "The Radon transform-theory and implementation." (1996): 201.

[3] Jain, Anil K. Fundamentals of digital image processing. Prentice-Hall, Inc., (1989): 439.

source

Helpers