Improve image quality. DVR or CAM

Hi ,

I have a system with 16 cams analog (non varifocal) connected to a SPECO 16TH DVR.

On the 16 cams , I have 3 FLIR 900 lines resolution and 13 low cost bullets cams.

They are both IR cams.

I set both to best quality settings (FPS , 720*480 resolution , H264 format , 120 PPS).

I cannot see the difference on the image quality between the 900L and others.Only on the night vision , it's much better.

What can I change to improve the quality ?

Thanks.

Check your DVR's recording quality and it can really compress each video channel into D1 X 30FPS rate.

If you can play back 4 Ch on HDTV monitor (1080P), you can examine their quality as they are about the same size of D1 that each camera sends to your DVR