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I am image processing student. Nowdays there are different brands of smartphones available. But the common thing is two different big brand smartphones with same Megapixel camera have different quality of image.

Moreover,the Digital cameras with same megapixel resolution have altogether best quality. Why is it so?

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  • $\begingroup$ @ThP - that's pretty much the answer. This link does a nice summary of why as well. $\endgroup$ – Batman Apr 22 '15 at 0:49
  • $\begingroup$ @Batman: posted as an answer. Very good summary in the link. $\endgroup$ – ThP Apr 22 '15 at 4:50
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I am not sure this is the right place to ask (Perhaps photo.stackexchange.com?) but this is my view on the subject. The term 'Megapixel' has little if any to do with image quality nowadays, since all the popular devices have sufficient amount of pixels. Way more important is the image processing algorithms, optics and sensor size. All digital cameras have huge advantage on the last two while smartphones usually 'make up' for this with image processing algorithms, but not enough to achieve similar quality.

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