Video frame grabber comprising analog video signals analysis system

摘要

A video frame grabber is described for digitizing analog video signals. The system comprises means for digitizing the synchronisation signals, corresponding to the analog video signals. Video gain and offset, sync gain and sync threshold can be adjusted electronically. A variable time delay can be imposed on the sampling clock signals and on horizontal reference signals. A method is described for determining the optimal sync gain factor based upon comparison of sample counts obtained from digitised signals which were amplified using different gain factors. IMAGE