Patent ID: 8395667

Claim:
A method for monitoring video signal transmission, comprising the steps of: a). receiving a composite video signal having frames with a predetermined frequency, each of which includes a vertical synchronization signal and a plurality of horizontal synchronization signals, each of which includes a horizontal video data series, following the vertical synchronization signal; b). detecting and encoding the composite video signal to cut off the horizontal video data series following the horizontal synchronization signal and add at least an identification code when the predetermined vertical synchronization signal and the predetermined horizontal synchronization signal in a predetermined order following the vertical synchronization signal of the predetermined frames are detected; c). transmitting all of the frames out; d). receiving the frames and detecting the predetermined frames to compare the identification code added in the horizontal video data series following the horizontal synchronization signal when the vertical synchronization signal and the predetermined horizontal synchronization signals following the vertical synchronization signal of each of the frames are detected; and e). transmitting the frames out when the identification code is correct.