Steganography in java

Hello folks,I have implemented steganography for Least Significant Bit(LSB) 2 bit which works for any kind of carrier files i.e,basically i can hide image/text/video in any of these files.
1)Now i need to do some improvement for the project i.e, implementing steganography using any other method which is more efficient than LSB.
2)what is the difference between in LSB 1 bit and 2 bit in terms of the output.How is LSB for 2 bit better than LSB 1bit??
3)Last question is on what basis can we compare the input and output video and i have sketch that in graph.So please help me out please