METHOD, DEVICE AND VIDEO CONFERENCE SYSTEM FOR DETECTING VIDEO SIGNALS IN SAME STANDARD

The present invention provides a method, device and video conference system for detecting video signals in the same standard. The method comprises: receiving video signal data output by any one of at least two signal sources in the same standard; recognizing a start position and an end position of valid data from the received video signal data; according to the recognized start position and end position of the valid data, counting the number of rows and columns of the received one complete frame data; if the number of rows and columns of the received one complete frame data in two adjacent counts is inconsistent, detecting that the received video signal data switches, and sending out the detection result. With the method for detecting video signals in the same standard in the present invention, it can be very easy to recognize whether the current data is one complete frame of valid image by means of counting and counting blanking rows and valid rows within the data, and then a quick switch of video signals can be detected.