Well, as already stated discussion of the 'poor quality' of the iPad's cameras is a recurrent topic, so I would support some searching -
The iPhone's camera produces 5 MP (megapixel) images which is similar to my older digital Canon camera - the images, esp. if not enlarged a lot are quite good.
However, the back camera of the iPad is less than 1 MP - that is primitive! You'll never obtain a good quality still image nor will you be able to photo-manipulate the images for any substantial improvement.
Best to obtain your images from a good up-to-date digital camera and then bring them into the iPad - again, plenty of threads on the ways this can be done.