Image/Video quality verification parameters

Dear Experts,

I am a newbie to image encoding.
I have been assigned to find the quality of the image/videothat has
been encoded.
I am getting the decoded image as my input. Now I need to find the
parameters that will define the quality of my image/video.

The parameters that I need to calculate are..
   1)Blurriness
   2)RGB Gamut
   3)Average Picture Level

Can any one guide me where can I get the algorithms to calculate these
parameters?. If any sample code available to do so, please let me
know.

Thanks in advance,

Regards,
RD