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How do I pass a matlab image array to a custom python function and receive back the image array output of the python function?

Asked by Michael Thieme on 15 Oct 2018
Latest activity Commented on by Michael Thieme on 18 Oct 2018
As the title suggests, I have a custom python function that processes images. I would like to read in an image using matlab, pass this image to the python function, and then receive the modified image that the python function returns. The caveat here is that the python function contains modifications from non-standard python library (such as PIL).
I've tried something as I've shown below, but judging by the off-base error messages I'm receiving, I don't think this was a promising thread. Therefore, I've opted not to show the error messages as I think they might mislead potential solutions.
% Import the python module mod = py.importlib.import_module('mymod');
% Read in the RGB image array inputImage = imread('image.jpg');
% Attempt to modify the image using the custom python function that utilizes PIL and return a modified image array modifiedImage = mod.mymod.some_function(inputImage);
Any help is greatly appreciated, thank you!

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1 Answer

Answer by Vineet Ahirkar on 18 Oct 2018

Hello Michael,
I assume that you are working in MATLAB R2018a.
From the code that you sent, it looks like you are trying to send an image from MATLAB to a python function, process it and send it back to MATLAB.
I would like to inform you that sending multi-dimensional arrays from MATLAB to python is supported only from R2018b and not supported in R2018a or before.
Please consider upgrading to MATLAB R2018b.
In R2018b, multi-dimensional arrays are sent to python in the form of memoryview which can be converted to a list or any other python data structure later.