Manufacturers have unfortunately relegated the cameras in tablets to being pretty crappy ones. Likely to keep costs down. And also probably for the fact that most folks will use their phone for their "snapshot" camera much more frequently than their tablet. And even though the Note 2 is a "phablet", its really more phone than tablet in form and function.
Likely not a lot you can do about image quality. You can try a 3rd party app, to see if the result is any better. But the culprit is likely the low cost camera module.
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Phone: HTC One X (AT&T version) Rooted, Bootloader Unlocked, S-Off
Tablet: Samsung Galaxy Note 8 (WiFi only) Rooted