How to specify in presentation that permission to use a particular image is taken? I am presently undertaking research on a particular topic in control systems. That particular topic has a long history and I found a image which summarizes the history in one image only. I want to use that particular image in my presentation. I have also taken permission from the authors of that image to use it. But, while using it in my slide, I want to show in the same slide that I have taken permission to use that image so that professors understand that I am not stealing that image but I have taken the requisite permission to use that image. What line or a sentence should I include in that particular slide, so that the professors get that point automatically. I mean something like "Used with permissions". Like that what is the precise line which can be included ?
You can cite it a number of ways. I usually do this:

Right below the image, (Smith et al. 1998) if it's a paper where the image comes from. Then at the end of the presentation, you can have a slide called "References", there you can list the paper in the reference style of your choosing (e.g. APA). This way it's very clear where the image comes from. 

I don't think the phrase "used with permissions" is necessary in a presentation. But I'm not certain. I'm sure others will comment on this. However, that phrase IS necessary if you were to publish the slides of your presentation, or if you will use that image in a paper.