csdt-stl-converter 1.2.1

Converts images to stl files

Adinkra Extrusion Converter version 3.0

================================================================ Requires csdt_stl_tools in order to function properly due to Python 3 updates.

Additional documentation and setup for PyPi can be found here.

Note: You need to be added to our PyPi repository to make your have your changes reflected on the site. Also, make sure to remember to update requirements.txt in csdt_website to latest version of csdt_stl_converter. Finally, this README might be slightly outdated. If there are any discrepancies, please submit the changes that worked for you.

Python 3.7.3

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This project contains routines to convert an Adinkra symbol in jpeg/png format and converts it to an STL file for 3D printing.

Make sure that the image background is either white (#FFFFFF) or transparent.

This can be used for any image, not just Adinkra symbols.

Release Note

- version 1.0/2.7: Project is first pushed to production
- version 1.1/2.7: Added an option to generate a negative mold as well as fixing issues with [r, g, b] channels

• • version 3.0: Updated to Python3 and set up for PyPi package updates

Requirement

• Python 3.7.3 (higher should be alright)
• Numpy 1.18.5
• OpenCV-Python 4.4.0.42 (for reading and resizing images)
• Scipy 1.5.2 (for scipy.ndimage.gaussian_filter)
• csdt_stl_tools 0.3.1

Installation

Adinkra_converter can be used as is.

The dependencies may be installed via pip with (This may vary based on your particular system and requirements reflected above)

python -m pip install numpy
python -m pip install opencv-python
python -m pip install scipy
python -m pip install csdt_stl_tools

Usage Examples:

image2stl.py contains the routines needed to convert images to STL, while adinkra_converter.py contains the interface that users interact with. adinkra_converter.py receives parameter options via the command line.

Here is the template for invoking adinkra_converter.py:
python adinkra_converter.py [-b/--base True/False] [-g/--smooth True/False] [-c/--negative True/False][-s/--size size] [-x/-scale scaling] image_directory stl_directory

-b False or --base=False specifies that a base is added; False would indicate not adding a base (this is the default option).
-g True or --smooth=True specifies that the image is smoothed before converting to STL; False would disable this feature (default option).
-c False r --negative=False specifies that the image is used to generate a square with the image object as a (default option is False).
-s 480 or --size=480 specifies that the image be resized to (480x480) (default option).
-x 0.1 or --scale=0.1 scales the resulting STL mesh height to 1/10 (default option).

image_directory is the directory where the image to convert to STL resides.

stl_directory is the directory in which to save the resulting STL file.

A few examples on how to use image2stl.py/adinkra_converter.py are shown below.
(NOTE: the use of an STL mesh viewer is recommended.)

on an image of a circle:

with adinkra_converter.py via the command line:
python adinkra_converter.py --base=True sample/images/circle.png sample/stl/circle_with_base.stl

with image2stl.py:

import image2stl

image = image2stl.read_image("sample/images/circle.png")
image_white_background = image2stl.convert_transparent_to(image, [255, 255, 255]) # transparent to #FFFFFF
resized_image = image2stl.convert_to_standard_size(image_white_background, size=256)
grayscaled_image = image2stl.grayscale(resized_image)
smoothed_image = image2stl.smooth_image(grayscaled_image, standard_deviation=1)
inverted_image = image2stl.grayscale_negative(smoothed_image)
image2stl.convert_to_stl(inverted_image, "sample/stl/circle_with_base.stl", base=True, output_scale=0.1)

You should get an circle mesh with base that looks like this (opened with Open 3D Model Viewer):

on an image of a triangle:

with adinkra_converter.py via the command line:
python adinkra_converter.py --base=False sample/images/triangle.png sample/stl/triangle.stl

with image2stl.py:

import image2stl

image = image2stl.read_image("sample/images/triangle.png")
image_white_background = image2stl.convert_transparent_to(image, [255, 255, 255]) # transparent to #FFFFFF
resized_image = image2stl.convert_to_standard_size(image_white_background, size=256)
grayscaled_image = image2stl.grayscale(resized_image)
smoothed_image = image2stl.smooth_image(grayscaled_image, standard_deviation=1)
inverted_image = image2stl.grayscale_negative(smoothed_image)
image2stl.convert_to_stl(inverted_image, "sample/stl/triangle.stl", base=False, output_scale=0.1)

You should get an triangle mesh that looks like this (opened with Open 3D Model Viewer):

convert_to_stl technically filters out black pixels, but the adinkra_converter gives a negative of the input image
thus, it's possible to do something like (using the same circle image above):

import image2stl

image = image2stl.read_image("sample/images/circle.png")
image_white_background = image2stl.convert_transparent_to(image, [0, 0, 0]) # transparent to #000000
grayscaled_image = image2stl.grayscale(image)
image2stl.convert_to_stl(grayscaled_image, "sample/stl/cylinder.stl", base=False, output_scale=1.0)

This will yield a cylinder mesh like so:

image2stl Function References

read_image(image_directory, read_mode)

This function reads in an image directory as a string and returns a numpy array of pixels in the image

:required_parameter image_directory: (String) The path in which the image resides
    The path can be a relative path to this script or an absolute path

:optional_parameter read_mode: (constants from cv2) This constants controls
    how to represent the pixels in the image. The constants include but is not limited to:
        cv2.IMREAD_COLOR - represent pixels as an array designating [red, green, blue] channels
        cv2.IMREAD_GRAYSCALE - represent pixels as intensity information
            0.0 being completely black and 1.0 being completely white
        cv2.IMREAD_UNCHANGED - represent pixels as an array designating [red, green, blue, alpha] channels

:return: (numpy.ndarray) an array of pixels representing the opened image

convert_to_standard_size(image_matrix, size=256)

Resize the images and change the aspect ratio to 1:1.

:required_parameter image_matrix: (numpy.ndarray) A 2D array of pixels of the image to resize
:optional_parameter size: (int) The desired size of the output image
    The default parameter specifies an output image of 256 x 256

:return: (numpy.ndarray) A 2D array of pixels representing the resized image

grayscale(image_matrix)

Converts colored images to grayscale
Only works for RGB or RGBA images

:required_parameter image_matrix: (numpy.ndarray) A 2D array of pixels representing an image
:return: (numpy.ndarray) A 2D array of pixels representing a grayscaled image

smooth_image(image_matrix, standard_deviation = 1)

Smooths out images using the Gaussian function

:required_parameter image_matrix: (numpy.ndarray) A 2D array of pixels representing an image
:optional_parameter standard_deviation: The standard deviation of the Gaussian function
    The default standard deviation is 1

:return: (numpy.ndarray) A 2D array of pixels representing a smoothed image

convert_transparent_to(image_matrix, target_pixel)

Converts all transparent pixels into white pixels
Only works on [r, g, b, a] pixels

:required_parameter image_matrix: (numpy.ndarray) a 2D array of pixels of the image to whiten
:optional_parameter target_pixel: (numpy.ndarray) a [r, g, b] pixel to replace transparent pixels with
:return: (numpy.ndarray) a 2D of pixels representing the whitened image

grayscale_negative(image_matrix)

Converts the grayscaled image array into its respective negative

:required_parameter image_matrix: (numpy.ndarray) The desired grayscale image to create a negative of
:return: The resulting negative image

convert_to_stl(image_matrix, output_file_directory, base=False, output_scale=0.1)

Converts the image matrix into an STL file and save it at output_file_directory
NOTE: This function currently only supports grayscale

:required_parameter image_matrix: (numpy.ndarray) A 2D array of pixels representing an image
:required_parameter output_file_directory: (string) The filename of the resulting STL file
:optional_parameter output_scale: decides the height scaling of the resulting STL mesh
:optional_parameter base: (boolean) A boolean value specifying whether or not
    to include a base into the resulting STL file