Mosquito Noise Reduction* This option lets you reduce the so-called "mosquito noise", or flicker, that appears on the edge of visual images while watching standard DVDs
Frame Noise Reduction* This option lets you reduce the mosaic like block noise displayed on screen
Block Noise Reduction* This option lets you reduce the fine noise (grit) displayed on screen
I would leave Dynamic Range off, and just set ALL video noise reduction to 3.
I recommend Dynamic Range on Automatic - then if the system detects a need to use it - it will
(this is an audio setting - if you use linear PCM you will definitely want it on but if you use Dolby you may want to turn it off)
otoh Video Noise Reduction I would leave off unless you are experienceing the issue that they are designed to fight as it changes picture quality (and usually makes the picture not as clear)