I know this question sounds weird, but I am looking for some kind of lens or filter to blur the images taken by a thermal camera. I don't need to blur a specific part of an image, just a blur uniformly over the whole image is good enough. Is there any such kind of equipment available?
Added: Software solution to reduce image resolution is not preferred, as it is required that the raw image data taken by the camera to be blurred. It would be ok if there exists some kind of material, when placed in front of the lens, is able to blur the image taken by the thermal camera.