Hey,
I know what you mean. If I were you, sincerely, I’d duplicate my DV footage. On first one, I’d lower the opacity, and on the other one, I’d play with the blending modes. This way, the quality of your DV (character, I guess?) will look like your CG background.
You could always try th effect Blur > Sharp.
If by any chances you’d have Magic Bullet, you could easily do this by applying the Buffalo Look on your DV footage.
Good luck pow!
Justin Productions
Tangerin01@hotmail.com
Adobe After Effects 6.5 Professional