If you mean improving the quality of a photo that you've already taken, to some extent, yes you can improve the quality. There's photo touchup software for both mobile devices, as well as laptops and desktops. Essentially you install the photo touchup app on your smart phone or tablet, and then you can perform different kinds of touch up operations, such as removing red eye glare, bluring, sharpening, filtering, etc. Can you make a really low quality picture look fantastic? Probably not, you can only edit the original and improve it, but your best bet if it's a really poor picture is to try to take another one with better photo shooting conditions.
