What error are you getting ? I don’t think showing an image using opencv in Unreal Engine is straight forward though, here are 2 ways you can fix that
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Read the image, save it using cv::imwrite and inspect it, if you see your saved file you are good to go
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In the Unreal Engine world images are textures, you can create a UI widget, initialize a texture using the read image and show it or in the game world, add a plane, create a texture using the image and apply it on the plane, that way you will see the read image
option 1 is more straight forward though