image_get is clearer—unless you've used Matlab, Octave, matplotlib, SciPy, OpenCV, scikit-learn, or other things that have copied Matlab's interface. In that case, using the established name is clearer.

(Unless, on the gripping hand, your image_get function is subtly different from Matlab's imread, for example by not returning an array, in which case a different name might be better.)